Coagulation detection by plunger sensing technique

• US 4,599,219 A
• Filed: 10/15/1982
• Issued: 07/08/1986
• Est. Priority Date: 10/15/1982
• Status: Expired due to Term

• Current Assignee: Hemotec Incorporated (Medtronic Plc)
• Original Assignee: Hemotec Incorporated (Medtronic Plc)
• Inventors: Cooper, Daniel, Jackson, Jacqueline J.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/434,718
• Time in Patent Office: 1,362 Days
• Field of Search: 422/100-103, 422/57, 422/58, 422/61, 422/73, 422/119, 422/44, 436/69, 436/165, 436/809, 436/43, 73/64.1, 73/57, 435/13, 210/918
• US Class Current: 422/430
• CPC Class Codes: G01N 2035/00306 Housings, cabinets, control panels (details)
• CPC Class Codes: G01N 2035/00316 Detecting door closure
• CPC Class Codes: G01N 33/4905 Determining clotting time of blood by chemical methods G01N33/86, C12Q1/56
• CPC Class Codes: G01N 33/86 involving blood coagulating time or factors, or their receptors
• CPC Class Codes: Y10T 436/11 Automated chemical analysis

Abstract

Coagulation is detected in a fluid sample contained in either a gas flow cartridge or a plunger sensor cartridge, either one of which may be inserted in an actuator mechanism which has the capability of acting on either type of cartridge. Coagulation is detected in the gas flow cartridge by optically sensing the accumulation of coagulating liquid in a foam member at the top of the reaction chamber. In the plunger sensor cartridge, a plunger assembly is raised and released to descend through the sample of liquid in the bottom of the reaction chamber. The plunger assembly descends more slowly upon an increase in the viscosity of the fluid sample due to coagulation. Both cartridges include a lower reagent chamber, an upper reaction chamber, and means initially sealing and thereafter communicating the contents from the reagent chamber to the reaction chamber. The actuator mechanism includes means for delivering the flow of gas to the gas flow cartridge and means for reciprocating the plunger assembly in the plunger sensor cartridge.

Claims

1. A cartridge in which to conduct a coagulation-related analytical test on fluid, comprising:

a tube-like member having an open interior extending generally axially therethrough from an open lower end to an upper end;

a partition of the tube-like member located within the open interior at a position intermediate the upper and lower ends of the tube-like member, said partition generally dividing the open interior into a lower chamber between the partition and the lower end and into an upper chamber between the partition and the upper end;

a passageway defined by and extending through the partition to allow fluid communication between the lower chamber and the upper chamber;

a plug member extending across the open interior of the lower chamber and sealing the open end of the lower chamber at a position spaced from the partition;

means for initially sealing the passageway to fluid communication therethrough and for subsequently selectively opening the passageway to fluid communication therethrough; and

a plunger assembly extending into the upper chamber, said plunger assembly adapted to be reciprocated within the tube-like member and includes means by which to operatively contact and move said plunger assembly in a generally axial direction while permitting descent by force of gravity during analytical test.

2. A cartridge as defined in claim 1 further comprising an optical machine readable code indicative of a predetermined type of analytical test to be conducted with the cartridge and wherein said machine readable code comprises a cover member, a darkened spot on said cover member, and an area defined by the cover within the spot having substantially different light transmissive characteristics than the spot.

3. A cartridge as defined in claim 1 in combination with a machine adapted to receive said cartridge therein and operative to create analytical tests in said cartridge, said machine including means operative in conjunction with said cartridge to detect coagulation-related information by optically sensing a predetermined movement of said plunger assembly within said upper chamber.

4. A cartridge as defined in claim 1 wherein:

said plunger assembly includes said initial sealing and subsequent opening means, and

said initial sealing and subsequent opening means moves out of said passageway upon upward movement of said plunger assembly.

5. A cartridge as defined in claim 1 or 4 wherein:

said plunger assembly comprises a plunger shaft which extends through said upper chamber to an upper end, and

said plunger shaft includes at least one flag member connected to the upper end of the plunger shaft, said flag member located at a position spaced outwardly of the upper end of the tube-like member.

6. A cartridge as defined in claim 5 wherein said means by which to operatively contact and move said plunger assembly includes at least a portion of the flag member.

7. A cartridge as defined in claim 5 further comprising:

shaft stabilizing means extending from the plunger shaft to a position substantially adjacent to the tube-like member for stabilizing the plunger shaft against tilting in at least one transverse direction toward the tube-like member.

8. A cartridge as defined in claim 5 in combination with actuator means for operatively contacting and moving said plug member into contact with said partition after said means operatively opens the passageway to fluid communicating therethrough.

9. A cartridge as defined in claim 5 further comprising:

means extending between the plunger shaft and the tube-like member for operatively resisting axial movement of the plunger shaft relative to the tube-like member when the plunger assembly is initially positioned at a lowermost positions within the upper chamber.

10. A cartridge as defined in claim 9 further comprising:

shaft stabilizing means extending from the plunger shaft to a position substantially adjacent to the tube-like member for stabilizing the plunger shaft against tilting in at least one transverse direction toward the tube-like member.

11. A cartridge as defined in claim 5 in combination with actuator means for operatively interacting with said means by which to contact said plunger assembly to vertically move said plunger shaft to create reciprocating movement of said plunger assembly in said upper chamber.

12. A cartridge as defined in claim 11 wherein said actuator means also operatively contacts and moves said plug member upward toward said partition to reduce the volume of said lower chamber substantially simultaneously with a vertically upward movement of said plunger assembly in said upper chamber.

13. A cartridge as defined in claim 5 wherein said initial sealing and subsequent opening means comprises a resilient member, the resilient member is connected to the lower end of the plunger shaft, and the resilient member is initially positioned within the pasaageway in a resiliently compressed state to establish a fluid-tight seal within the passageway for preventing fluid communicating therethrough.

14. A cartridge as defined in claim 13 wherein said resilient member comprises a disc member having a main body portion and a flange portion extending outward from the main body portion.

15. A cartridge as defined in claim 14 wherein the flange portion defines a plurality of slots extending therethrough.

16. A cartridge as defined in claim 14 wherein the flange portion is annular and extends radially outward from the main body portion.

17. A cartridge as defined in claim 16 wherein the tube-like member in the upper chamber is substantially cylindrical for a predetermined axial distance upward from the partition and is of a diameter greater than the diameter of the annular flange portion to achieve a substantially uniform clearance between the flange portion and the tube-like member over the predetermined axial distance.

18. A cartridge as defined in claim 5 wherein the flag member comprises a contact surface facing toward and spaced from the upper end of the tube-like member, the space between the contact surface of the flag member and the upper end of the tube-like member allowing the insertion of a lifting means therein whereby lifting force is transmitted to the plunger assembly.

19. A cartridge as defined in claim 18 further comprising:

shaft stabilizing means extending from the plunger shaft to a position substantially adjacent the tube-like member for stabilizing the plunger shaft against tilting in at least one transverse direction toward the tube-like member.

20. A cartridge as defined in claim 19 wherein the contact surface of the flag member extends transversely outward from the plunger shaft, and said stabilizing means comprises a projection extending from the shaft member in a transverse direction opposite to that which the contact surface extends, said projection extending from the plunger shaft between its upper and lower ends.

21. A cartridge as defined in claim 20 wherein the projection stabilizes the plunger shaft against tilting upon movement of the lifting means along the contact surface of the flag member.

22. A cartridge as defined in claim 5 wherein said plunger shaft further comprises:

a cross member extending transversely at a position intermediate the upper and lower ends of the plunger shaft;

a pair of flag shafts, one flag shaft connected to the cross member and extending upwardly from the cross member at a position adjacent each outer transverse end of the cross member; and

a pair of said flag members, one flag member connected to upper end of each flag shaft.

23. A cartridge as defined in claim 22 further comprising:

a vane extending generally in a plane radially outward from the plunger shaft, the vane having a transverse width greater than the transverse width of the plunger shaft.

24. A cartridge as defined in claim 22 further comprising:

a pair of tabs, one tab extending transversely outward a predetermined distance from each flag shaft toward the tube-like member, said tabs positioned at axial locations on the flag shafts to transversely contact the tube-like member when the plunger assembly is positioned at a lowermost initial position within the upper chamber, the predetermined transverse outward distance to which the tabs extend causing transverse resilient deflection of the flag shafts inward toward one another when the tabs contact the tube-like member.

25. A cartridge as defined in claim 24 further comprising:

a projection extending from the cross member and terminating at an end edge adapted to contact the tube-like member to operatively prevent tilting of the plunger shaft in one transverse direction relative to the cross member.

26. A cartridge as defined in claim 25 further comprising:

a vane extending generally in a plane radially outward from the plunger shaft, the vane having a transverse width greater than the transverse width of the plunger shaft.

27. A cartridge as defined in claim 26 wherein the means for initially sealing the passageway comprises a disc member attached to the lower end of the plunger shaft and the disc member further comprises:

a main disc body portion;

a flange portion extending outward from the main disc body portion;

a plurality of slots extending through and defined by the flange portion.

28. A cartridge as defined in claim 27 wherein:

the flange portion is annular and extends radially outward from the main disc body portion.

29. A cartridge as defined in claim 28 wherein the tube-like member in the upper chamber is substantially cylindrical for a predetermined axial distance upward from the partition and is of a diameter greater than the diameter of the annular flange portion achieve a substantially uniform clearance between the flange portion and the tube-like member over the predetermined axial distance.

30. A cartridge in which to conduct a coagulation-related analytical test on a sample of liquid blood inserted therein, comprising:

a tube-like member having an interior surface and defining an open interior extending along an axis therethrough from a lower end to an upper end;

a partition of the tube-like member located within the open interior and extending inward from the interior surface toward the axis at a position intermediate the upper and lower ends of the tube-like member, said partition generally dividing the open interior into a lower chamber between the partition and the lower end and into an upper chamber between the partition and the upper end;

a passageway defined by the partition and extending through the partition to allow fluid communication between the lower chamber and the upper chamber;

a plug member operatively extending across and sealed against the interior surface of the tube-like member within the lower chamber, said plug member adapted to be axially moved along the interior surface of the lower chamber toward the partition;

a plunger assembly comprising a plunger shaft extending through the upper chamber to an upper end thereof above the upper end of the tube-like member and a disc member connected to the lower end of the plunger shaft;

the disc member including a main body portion and a flange portion extending outward from an upper end of the main body portion, the flange portion defining a plurality of slots extending through the flange portion, the main body portion initially positioned within the passageway and operative to seal the passageway to fluid communication therethrough;

said plunger shaft further including means connected to the upper end of the plunger shaft and adapted to be contacted to move the plunger shaft and connected disc member axially upward in the upper chamber, initial upward movement of the disc member from within the passageway opening the passageway to the flow of fluid therethrough;

said plunger assembly adapted to be reciprocated within the tube-like member in a generally axial direction while permitting descent by force of gravity; and

a predetermined quantity and type of fluid reagent initially confined in the lower chamber between the partition and the plug member.

31. A cartridge as defined in claim 30 wherein the interior surface of the upper chamber of the tube-like member is concentric about the axis and is of substantially uniform diameter above the partition for a predetermined distance which encompasses a distance in which the disc member moves during the analytical test, and the flange portion extends annularly outwardly from the main body portion to an outermost diameter which is less than the diameter of the interior surface of the upper chamber for the predetermined axial distance above the partition.

32. A cartridge as defined in claim 30 further comprising:

shaft stabilizing means extending from the plunger shaft to a position substantially adjacent the interior surface of the tube-like member for stabilizing the plunger shaft against tilting in at least one transverse direction toward the interior surface of the tube-like member.

33. A cartridge as defined in claim 30 in combination with actuator means adapted to receive said cartridge and to operatively conduct a coagulation-related analytical test within said cartridge, said actuator means comprising:

means for raising said plunger assembly from its initial position within the upper chamber and releasing said plunger assembly to descend, and thereafter cyclically raising the plunger assembly and releasing it for descent;

means simultaneously operative with said plunger assembly raising means, for moving said lower plug member upward in the lower chamber against the partition to force the fluid reagent into the upper chamber;

means for sensing the descent of the plunger assembly; and

means for signalling coagulation upon the sensing of a predetermined condition of descent of the plunger assembly.

34. A cartridge as defined in claim 30 in combination with actuator means adapted to receive said cartridge and to operatively conduct a coagulation-related analytical test within said cartridge, said actuator means comprising:

means for raising said plunger assembly from its initial position within the upper chamber and for thereafter periodically raising said plunger assembly during reciprocative movement of the plunger assembly; and

means simultaneously operative with said plunger assembly raising means, for moving said plug member upward in the lower chamber against the partition to force the fluid reagent into the upper chamber substantially simultaneously with the raising of the plunger assembly from its initial position within the upper chamber.

35. A cartridge in combination with actuator means as defined in claim 34, and said actuator means further comprising:

a lift member;

carrying means for carrying said lift member in translational movement between a forward position and a rearward position, said carrying means moving said lift member into contact with said means connected to the upper end of the plunger shaft and adapted to be contacted to move the plunger shaft and disc member axially upward, said carrying means also retaining said lift member for free vertical movement; and

slide means operative for contacting said lift member when carried to the forward position and for vertically reciprocating said lift member.

36. A cartridge as defined in claim 30 further comprising:

a cover extending over the upper end of the tube-like member and including at least one hole therein to allow portions of the plunger shaft to extend through the cover; and

optically perceptable and machine-readable code on said cover indicative of the cartridge.

37. A cartridge as defined in claim 36 wherein said code comprises a plurality of spots printed on the cover, each spot being substantially opaque, and a hole defined by the cover in the center of at least one spot through which light is transmitted.

38. A cartridge as defined in claim 37 in combination with actuator means adapted to receive said cartridge and to operatively conduct a coagulation-related analytical test with said cartridge, said actuator means comprising means for determining the type of analytical test to be conducted by sensing the code on said cartridge, the code sensing means comprising:

transmitting means directing an identifying light beam onto each spot printed on the cover;

receiving means adapted to receive the identifying light beam from said transmitting means, said receiving means positioned on the opposite side of said cover from said light beam directing means; and

the opaque characteristics of each spot substantially interrupting the transmission of each light beam to said receiving means, and the hole in a spot allowing the transmission of light therethrough to said receiving means.

39. A cartridge as defined in claim 30 wherein said plunger shaft further comprises:

a lower shaft portion extending from adjacent the disc member upward to a position intermediate the upper and lower ends of the plunger shaft;

a cross member portion extending transversely from the upper end of the lower shaft portion and terminating at outer edges adjacent to but spaced from the interior surface of the tube-like member;

a pair of flag shafts, one flag shaft connected to the cross member portion and extending upwardly from the cross member portion at a position adjacent each outer edge of the cross member portion; and

a pair of flag members, one flag member connected to an upper end of each flag shaft, said means adapted to be contacted to move the plunger shaft axially comprising a surface of each flag member.

40. A cartridge as defined in claim 39 wherein said plunger shaft further comprises:

a tab extending transversely outward a predetermined distance from each flag shaft to an end which faces toward the interior surface of the tube-like member, said tabs positioned at axial positions on the flag shaft intermediate the flag members and the cross member portion to contact ends of the tabs with the interior surface of the tube-like member when the plunger assembly is initially positioned within the upper chamber, the predetermined transverse outward distance to which the ends of the tabs extend causing transverse deflection of the flag shafts inward toward one another when the ends of the tabs transversely contact the interior surface of the tube-like member, the inward deflection of each flag shaft when the ends of the tabs contact the interior surface of the tube-like member being sufficient to develop force for resisting axial movement of the plunger shaft.

41. A cartridge as defined in claim 40 wherein said plunger shaft further comprises:

a projection portion extending outward from the cross member portion and terminating at a forward end edge adjacent to the interior surface of the tube-like member, the forward end edge adapted to contact the interior surface of the tube-like member to operatively prevent substantial tilting of the plunger shaft in a direction transverse with respect to the cross member.

42. A cartridge as defined in claim 41 wherein said flag members extend from the flag shafts substantially in the opposite transverse direction with respect to the cross member from the direction in which the projection portion extends from the cross member portion, and the surface of each flag member which is adapted to be contacted also extends from the flag shafts in the same direction as said flag members extend from said flag shafts, whereby the plunger shaft is substantially stabilized against tilting in a first direction by contact with the surface of the flag members and the flag shafts and in an opposite direction by the contact of the end edge of the projection portion with the interior surface of the tube-like member, and in either transverse direction by contact of outer edges of the cross member portion with the interior surface of the tube-like member.

43. A cartridge as defined in claim 39 wherein said plunger shaft further comprises:

a vane portion extending generally in the plane of the cross member portion and downwardly from the cross member portion to the lower portion of the plunger shaft, the vane portion having a transverse width greater than the diameter of the lower portion and less than the transverse distance between the outer edges of the cross member portion.

44. A cartridge as defined in claim 43 in combination with actuator means adapted to receive said cartridge and to operatively conduct a coagulation-related analytical test within said cartridge, said actuator means comprising:

means for raising said plunger assembly from its initial position within the upper chamber and releasing said plunger assembly to descend and thereafter cyclically raising said plunger assembly and releasing it for descent;

means simultaneously operative with said plunger assembly raising means, for moving said lower plug member upward in the lower chamber against the partition to force the fluid reagent into the upper chamber;

means directing a light beam into the upper chamber at a position where the cross member and the vane portion interrupt the light beam when the plunger assembly is raised to a predetermined position above its initial position and where transmission of light in the beam occurs after the plunger assembly has descended below the predetermined position;

means receptive of the light beam for delivering signals in response to the presence or absence of the light beam;

means responsive to the signals of said light beam receptive means, for measuring the elasped time from the moment when said plunger assembly is released to descend until the moment when transmission of the light beam is reestablished by descent of the plunger assembly beyond the predetermined position; and

means for signalling coagulation upon the elapsed time for descent of the plunger assembly exceeding a predetermined time period.

45. A cartridge in combination with actuator means as defined in claim 44, wherein:

said light beam directing and receptive means are positioned on transversely opposite sides of the tube-like member when the cartridge is received in said actuator means, and the light beam extends through said tube-like member and between the pair of flag shafts and above the cross member portion when said plunger assembly descends beyond the predetermined position.

46. A cartridge in which to conduct a coagulation-related analytical test on fluid, comprising:

a tube-like member having open interior extending generally axially therethrough from an open lower end to an upper end;

a partition of the tube-like member located within the open interior at a position intermediate the upper and lower ends of the tube-like member, said partition generally dividing the open interior into a lower chamber between the partition and the lower end and into an upper chamber between the partition and the upper end;

a passageway defined by and extending through the partition to allow fluid communication between the upper and lower chambers;

a plug member extending across the open interior of the lower chamber and sealing the open end of the lower chamber at a position spaced from the partition;

a resilient member initially positioned within the passageway in a resiliently sealing state to establish a fluid-tight seal within the passageway for preventing fluid communication therethrough;

a shaft member connected to the resilient member and extending within the open interior of the tube-like member by which to apply force for removing the resilient member from within the passageway to open the passageway to fluid communication therethrough, and

said shaft member and resilient member adapted to be reciprocated within the tube-like member in a generally axial direction while permitting descent by force of gravity.

47. A cartridge as defined in claim 46 wherein said plug member is adapted to be axially moved along the interior surface of said lower chamber toward the partition.

48. A cartridge as defned in claim 47 in combination with said actuator means, said actuator means further comprising:

means operative simultaneously with the application of lifting force to said shaft member to remove said resilient member from the passageway, for moving said plug member in said lower chamber against the partition.

49. A cartridge as defined in claim 46 wherein the shaft member is elongated, one end of the shaft member is connected to the resilient member, the other end of the shaft member extends out of the upper end of the tube-like member, and the other end of the shaft member includes means by which to apply force for moving the shaft member and the connected resilient member.

50. A cartridge as defined in claim 49 wherein said means connected to the other end of the shaft member comprises a flag member connected to the other end of the shaft.

51. A cartridge as defined in claim 50 wherein the flag member comprises a contact surface facing toward and spaced from the upper end of the tube-like member, the space between the contact surface of the flag member and the upper end of the tube-like member allowing the insertion of a lifting means therein whereby to transmit forces to the flag member.

52. A cartridge as defined in claim 51 further comprising shaft stabilizing means extending from the shaft member to a position substantially adjacent the tube-like member for stabilizing the shaft member against substantial tilting toward the tube-like member.

53. A cartridge as defined in claim 52 wherein the contact surface extends transversely outward from the shaft member, and said stabilizing means comprises a projection extending from the shaft member in a transverse direction opposite to that which the contact surface extends, said projection positioned on the plunger shaft between the flag member and the resilient member.

54. A cartridge as defined in claim 53 wherein said shaft stabilizing means stabilizes the shaft member against tilting upon movement of the lifting means between the contact surface of the flag member and the upper end of the tube-like member.

55. A cartridge as defined in claims 52 or 54 wherein the resilient member connected to the lower end of the shaft member comprises:

a main body portion; and

a flange portion extending outward from the main body portion.

56. A cartridge as defined in claim 55 wherein the flange portion of the resilient member further defines a plurality of slots extending therethrough.

57. A cartridge as defined in claim 56 wherein the flange portion is annular and extends radially outward from the main body portion.

58. A cartridge as defined in claim 57 wherein the tube-like member in the upper chamber is substantially cylindrical for a predetermined axial distance from the partition and is of a diameter greater than the diameter of the annular flange portion to achieve a substantially uniform clearance between the flange portion and the tube-like member over the predetermined axial distance.

59. A cartridge as defined in claim 56 in combination with actuator means adapted to receive said cartridge and to operatively conduct a coagulation-related analytical test within said cartridge, said actuator means comprising:

lifting means for contacting said contact surface to raise the shaft member and connected resilient member from the initial position and to release the assembly of the shaft member and the resilient member for descent, and thereafter cyclically raising the assembly and releasing it for descent; and

means for sensing the descent of the assembly and for determining coagultion conditions from the sensed descent of the assembly.

60. A cartridge as defined in claim 59 in combination with said actuator means, said means for sensing the descent comprising optical means for sensing a predetermined condition of movement of the assembly.

61. A cartridge as defined in claim 60

a plug member extending across the open interior of one of said chambers and sealing the open end of said chamber at a wherein said plug member is adapted to be axially moved along the interior surface of said lower chamber toward the partition.

62. A cartridge as defined in claim 61 in combination with said actuator means, said actuator means further comprising:

means operative simultaneously with the application of lifting force to said shaft member to remove said resilient member from the passageway, for moving said plug member in said lower chamber against the partition.

63. A cartridge in which to conduct a coagulation related analytical test on fluid, comprising:

a tube-like member having an open interior extending generally axially therethrough from a open lower end to an upepr end;

a partition of the tube-like member located within the open interior at a position intermediate the upper and lower ends of the tube-like member, said partition generally dividing the open interior into a lower chamber between the partition and the lower end and into an upper chamber between the partition and the upper end;

a means extending across the open interior of the lower chamber and initially sealing the open end of the lower chamber at a position spaced from the partition;

means for intitially sealing the passageway to fluid communication therethrough and for subsequently selectively opening the passageway to fluid communication therethrough;

a plunger assembly having an elongated plunger shaft extending into the upper chamber;

retarding means connected to one end of the plunger shaft within the chamber and operative for interacting with a fluid in the upper chamber and retarding movement of the plunger shaft through the fluid in a predetermined relation to the viscosity of the fluid; and

a contact member connected to the other end of the plunger shaft and located exteriorly of the upper end of the tube-like member, said contact member defining a contact surface facing toward the upper end of the tube-like member, the contact surface spaced from the upper end of the tube-like member a predetermined distance to allow the insertion of lifting means therein to allow lifting of the plunger assembly during the analytical test.

64. A cartridge as defined in claim 63 in combination with actuator means adapted to receive said cartridge and to operatively conduct a coagulation-related analytical test within said cartridge, said actuator means comprising:

lifting means for contacting said contact surface to raise the shaft member and the retarding means and to release the assembly of the shaft member and the retarding means for descent through the fluid, and thereafter cyclically raising the assembly and releasing it for descent; and

means for sensing the descent of the assembly and for determining coagulation conditions from the sensed descent of the assembly.

65. A cartridge as defined in claim 64 in combination with said actuator means, said means for sensing the descent comprising optical means for sensing predetermined conditions for movement of the assembly.

66. A cartridge as defined in claim 63 further comprising shaft stabilizing means extending from the shaft member to a position substantially adjacent the tube-like member for stabilizing the shaft member against substantial tilting toward the tube-like member.

67. A cartridge as defined in claim 66 wherein the contact surface extends transversely outward from the shaft member, and said stabilizing means comprises a projection extending from the shaft member in a transverse direction opposite to that which the contact surface extends, said projection positioned on the plunger shaft between the contact member and the retarding means.

68. A cartridge as defined in claim 67 wherein said shaft stabilizing means stabilizes the shaft member against tilting upon movement of the lifting means between the contact surface of the contact member and the one upper end of the tube-like member.