Piston cylinder type damper

• US 4,629,167 A
• Filed: 07/11/1984
• Issued: 12/16/1986
• Est. Priority Date: 07/14/1983
• Status: Expired due to Term

• Current Assignee: Nifco Incorporated 184-1 Maioka-Cho Totsuka-Ku Yokohama-Shi Kanagawa-Ken Japan
• Original Assignee: Nifco Incorporated
• Inventors: Kimura, Shigeru, Mizusawa, Akira
• Primary Examiner(s): HALVOSA, GEORGE
• Application Number:
  US06/629,761
• Time in Patent Office: 888 Days
• Field of Search: 188/322.15, 188/322.22, 188/282, 188/300, 188/67, 16/66, 16/84, 267/127, 267/120, 267/8.2, 267/64.12, 267/124, 137/846, 92/14, 92/23, 92/26, 92/170, 92/248, 403/109
• US Class Current: 267/226
• CPC Class Codes: E05F 5/10 with piston brakes
• CPC Class Codes: E05Y 2201/21 Brakes
• CPC Class Codes: E05Y 2201/256 with pistons or vanes
• CPC Class Codes: E05Y 2201/264 linear
• CPC Class Codes: F16F 9/0209 Telescopic F16F9/04 takes precedence
• CPC Class Codes: F16F 9/3221 of piston rods
• CPC Class Codes: Y10T 137/7882 Having exit lip

Abstract

The piston cylinder type damper comprises a cylinder connected to either member of the pair of a main body and an openable object, and a piston connected to the other member of the pair and adapted to fit into the cylinder and the piston incorporates therein a check valve adapted to allow the air in the cylinder to escape from the cylinder interior while the piston is driven into the cylinder by the movement of the openable object.

Claims

1. A piston-cylinder type damper, comprising:

a cylinder connected to one of a main body and an openable object and having a bottom end wall and an open top end;

a piston, connected to the other one of said main body and said openable object, disposed within said cylinder through said open top end and provided at the end thereof which is disposed interiorly of said cylinder with a cylindrical hollow cavity portion;

coil spring means disposed within said cylinder between said interior end of said piston and said bottom end wall of said cylinder for resisting the inward movement of said piston into said cylinder when said openable object is moved from an open position to a closed position and for biasing said piston outwardly from said cylinder so as to cause said openable object to move from said closed position to said open position;

check valve type damping means disposed within said cylindrical hollow cavity portion of said piston for controlling the inward and outward movement of said piston relative to said cylinder, and therefore the closing and opening movement of said openable object; and

releasable locking means mounted upon said piston and cylinder for retaining said piston at said inward position relative to said cylinder against the biasing force of said biasing means, and thereby retaining said openable object at said closed position, when said releasable locking means is engaged, and for permitting said piston to move outwardly relative to said cylinder under the influence of said biasing means, and thereby permit said openable object to attain its open position, when said releasable locking means is disengaged, comprising a heart-shaped land area provided upon the outer surface portion of said piston, endless groove means defined within said outer surface portion of said piston and disposed about said heart-shaped land area of said piston, and a locking pin fixedly mounted upon said cylinder for disposition within said endless groove means of said piston and for cooperation with said heart-shaped land area so as to respectively permit relative movement of said piston with respect to said cylinder between said open and closed positions, and to retain said piston at said inward position and said openable object at said closed position.

2. A damper according to claim 1, wherein said piston comprises a leading end formed into a hollow tube and a cross shaft, and said check valve is fixed within said hollow tube.

3. A damper according to claim 2, wherein said check valve is made of synthetic rubber, provided at its one end with an opened air port and at its other end with a normally closed beak, and fixed within said hollow tube with said beak directed toward said cross shaft of said piston.

4. A damper as set forth in claim 2, wherein:

said cross shaft portion of said piston has a cruciform configuration as viewed in cross-section.

5. A damper according to claim 1, wherein said cylinder has a tapered threaded hole at the end wall thereof and a tapered screw is helically fitted in said tapered hole to adjust the degree of controlling movement of said damping means.

6. A damper as set forth in claim 1, wherein:

said piston and cylinder are both fabricated from a plastic material.

7. A damper as set forth in claim 1, wherein:

said locking pin has the configuration of an inverted-U with a longer leg thereof extending radially inwardly into said endless groove means.

8. A piston-cylinder type damper, comprising:

a cylinder connected to one of a main body and an openable object and having a bottom end wall and an open top end;

a piston, connected to the other one of said main body and said openable object, disposed within said cylinder through said open top end and provided at the end thereof which is disposed interiorly of said cylinder with a cylindrical hollow cavity portion;

coil spring means disposed within said cylinder between said interior end of said piston and said bottom end wall of said cylinder for resisting the inward movement of said piston into said cylinder when said openable object is moved from an open position to a closed position and for biasing said piston outwardly from said cylinder so as to cause said openable object to move from said closed position to said open position;

check valve type damping means disposed within said cylindrical hollow cavity portion of said piston for controlling the inward and outward movement of said piston relative to said cylinder, and therefore the closing and opening movement of said openable object;

female means defined upon the outer surface of said piston comprising a heart-shaped recessed land area and endless groove means leading up to and away from said heart-shaped recessed land area; and

male locking pin means fixedly mounted upon said cylinder for disposition within said endless groove means and for engaging said heart-shaped recessed land area of said piston against the biasing force of said coil spring biasing means so as to retain said piston, and said openable object, in an inward closed position against said biasing force of said coil spring biasing means, and for disengaging said heart-shaped recessed land area of said piston so as to permit said piston, and said openable object, to move to an outward open position under the influence of said biasing force of said coil spring biasing means.

9. A piston-cylinder type damper, as set forth in claim 8, wherein:

said check valve damping means comprises a duckbill type check valve with its beak directed toward said open and outward position of said openable object and said piston.

10. A piston-cylinder type damper as set forth in claim 8, wherein:

said check valve is fabricated from synthetic rubber.

11. A piston-cylinder type damper as set forth in claim 8, wherein:

said piston and cylinder are fabricated from a plastic material.

12. A piston-cylinder type damper as set forth in claim 8, further comprising:

a threaded bore defined within said end wall of said cylinder; and

an adjustment screw threadedly received within said threaded bore for controlling the admission of ambient air into said cylinder whereby the damping degree of said damping means is adjustable.

13. A damper as set forth in claim 8, wherein:

said piston has a shaft portion fabricated in the configuration of a cruciform.

14. A damper as set forth in claim 8, wherein:

said locking pin has the configuration of an inverted-U with a longer leg thereof extending radially inwardly into said endless groove means.

15. A piston-cylinder type damper, comprising:

a cylinder connected to one of a main body and an openable object and having a bottom end wall and an open top end;

a piston, connected to the other one of said main body and said openable object, disposed within said cylinder through said open top end and provided at the end thereof which is disposed interiorly of said cylinder with a cylindrical hollow cavity portion;

coil spring means disposed within said cylinder between said interior end of said piston and said bottom end wall of said cylinder for resisting the inward movement of said piston into said cylinder when said openable object is moved from an open position to a closed position and for biasing said piston outwardly from said cylinder so as to cause said openable object to move from said closed position to said open position;

check valve type damping means disposed within said cylindrical hollow cavity portion of said piston for controlling the inward and outward movement of said piston relative to said cylinder, and therefore the closing and opening movement of said openable object; and

releasable locking means mounted upon said piston and cylinder for retaining said piston at said inward position relative to said cylinder, and said openable object at said closed position, against the biasing force of said coil spring biasing means in response to inward movement of said piston and said openable object from said open position to an inward position beyond said closed position of said openable object, when said releasable locking means is engaged, and for permitting said piston to move-outwardly relative to said cylinder, and said openable object to move to said open position, under the influence of said coil spring biasing means in response to inward movement of said piston and said openable object from said inward position of said piston relative to said cylinder and said closed position of said openable object to said inward position beyond said closed position of said openable object against said biasing force of said coil spring biasing means so as to disengage said releasable locking means, comprising a heart-shaped land area provided upon the outer surface portion of said piston, endless groove means defined within said outer surface portion of said piston and disposed about said heart-shaped land area of said piston, and a locking pin fixedly mounted upon said cylinder for disposition within said endless groove means of said piston and for cooperation with said heart-shaped land area so as to respectively permit relative movement of said piston with respect to said cylinder between said open and closed positions of said openable object, and to retain said piston at said inward position and said openable object at said closed position.

16. A piston-cylinder type damper as set forth in claim 15, wherein:

said check valve type damping means comprises a duckbill type check valve.

17. A piston-cylinder type damper as set forth in claim 15, further comprising:

a threaded bore defined within said end wall of said cylinder; and

an adjustment screw threadedly engaged within said threaded bore for controlling the admission of ambient air into said cylinder whereby the damping degree of said damping means is adjustable.

18. A damper as set forth in claim 15, wherein:

said piston has a shaft portion having the configuration of a cruciform.

19. A damper as set forth in claim 15, wherein:

said piston and cylinder are fabricated from a plastic material.

20. A damper as set forth in claim 15, wherein:

said locking pin has the configuration of an inverted-U with a longer leg thereof extending radially inwardly into said endless groove means.