Device for attaching a tool

• US RE33,335 E
• Filed: 06/29/1988
• Issued: 09/18/1990
• Est. Priority Date: 02/18/1984
• Status: Expired due to Term

• Current Assignee: C & E Fein GmbH & Company KG
• Original Assignee: C & E Fein GmbH & Company KG
• Inventors: Rudolf, Boris, Gentischer, Josef
• Primary Examiner(s): PARKER JR, ROSCOE
• Application Number:
  US07/213,180
• Time in Patent Office: 811 Days
• Field of Search: 51/168, 51/170 R, 51/170 PT, 51/170 T, 83/666, 83/698, 279/1 K, 279/8
• US Class Current: 451/342
• CPC Class Codes: B24B 23/02 with rotating grinding tools; Accessories therefor
• CPC Class Codes: B24B 23/022 Spindle-locking devices, e.g. for mounting or removing the tool
• CPC Class Codes: B24B 45/006 Quick mount and release means for disc-like wheels, e.g. on power tools
• CPC Class Codes: Y10T 83/9379 At end of shaft

Abstract

A device for attaching a tool in portable angled grinders, allowing the connection to be released without special accessories. The device consists essentially of a hollow driveshaft, of a spindle that slides inside it, and of a tool-securing point consisting of a mating flange and nut. The nut is loosened by activating the displacing mechanism, which displaces the spindle toward the tool-securing point, lifting the nut, which is connected to the spindle by means of a threaded pin, off of the tool. The nut can then be screwed off by hand.

Claims

1. Apparatus for attaching a tool in portable angled grinders comprising a motor;

angular drive means, and a securing station for the tool;

said angular drive means comprising a pinion, a beveled cogwheel, and a hollow driveshaft having an axis;

a spindle positioned in said driveshaft;

housing means for housing said drive means;

displacing means, said spindle being positioned in said driveshaft so that it cannot rotate .Iadd.relative to the driveshaft .Iaddend.but can be displaced axially from outside said housing means by said displacing means;

activating means in said displacing means;

traveling means and a terminal component, said spindle having an appendage;

resilient means between a face of said driveshaft and said appendage on said spindle, said activating means in said displacing means acting .[.through said traveling means at an angle to the axis of said driveshaft.]. on said terminal component against a force of said .[.resilinet.]. .Iadd.resilient .Iaddend.means .Iadd.by use of surface of said traveling means, said surface being inclined at an angle to the axis of said driveshaft.Iaddend.;

said .[.driveshaft.]. .Iadd.spindle .Iaddend.having a threaded pin;

a nut screwed onto said threaded pin;

a bushing-shaped cover on said driveshaft for limiting travel so that said nut screwed onto said threaded pin on said .[.driveshaft.]. .Iadd.spindle .Iaddend.is lifted away from the tool. .[.

2. Apparatus according to claim 1, wherein said spindle has teeth engaging inside the hollow driveshaft..]. .[.3. Apparatus according to claim 1, including a cylindrical appendage on said displacing means;

said terminal component being on said spindle;

said housing means having a threaded bore;

said cylindrical appendage on said displacing means acting on said terminal component to an extent that it is screwed into or out of said threaded bore in said housing means..]. .[.4. Apparatus according to claim 1, including a guide in said housing means, said displacing means comprising a displacing head slidable in said guide in said housing means;

said displacing head having a sloping surface on a side extending into said housing means..]. .[.5. Apparatus according to claim 1, including a sliding rod and troughs with a perforation for accommodating said sliding rod in edges between lateral surfaces and a surface of said housing facing toward the tool;

said sliding rod having a spring extending across a direction in which the rod slides in center of a side facing said terminal

3. component..]. 6. Apparatus .[.according to claim 1, wherein.]. .Iadd.for attaching a tool in portable angled grinders comprising a motor;

angular drive means, and a securing station for the tool;

said angular drive means comprising a pinion, a beveled cogwheel, and a hollow driveshaft having an axis;

a spindle positioned in said driveshaft;

housing means for housing said drive means;

displacing means, said spindle being positioned in said driveshaft so that it cannot rotate relative to the driveshaft but can be displaced axially by said displacing means;

activating means in said displacing means;

traveling means and a terminal component, said spindle having an appendage;

resilient means between a face of said driveshaft and said appendage on said spindle, said activating means in said displacing means acting on said terminal component against a force of said resilient means by use of a surface of said traveling means, said surface being inclined at an angle to the axis of said driveshaft;

.Iaddend.said displacing means .[.can be activated.]. .Iadd.being activatable .Iaddend.from outside said housing means.[., said tool being attachable in portable angled grinders with said displacing means that can be activated from outside said housing means.].;

said spindle .[.being positioned in said hollow driveshaft and.]. having .[.tensioning means.]. .Iadd.clamping means .Iaddend.on an end remote from said displacing means .Iadd.for clamping said tool;

said tool being attachable with said displacing means that can be activated from outside said housing means cooperating with said clamping means.Iaddend.. .[.7. Apparatus according to claim 6, wherein said spindle has slots forming a drill chuck and an external

5. around it a groove accommodating said resilient snap-in means..]. 14. Apparatus .[.according to claim 1, wherein the tool is attachable in portable angled grinders;

stroke means;

means for mounting said spindle to be displaceable axial but not rotatable in said hollow driveshaft, said spindle being displaceable by said displacing means from outside said housing means, said activating means acting in said housing means through said stroke means transversely to said axis of said driveshaft on said terminal component against a force of said resilient means;

.]. .Iadd.for attaching a tool in portable angled grinders comprising a motor;

angular drive means, and a securing station for the tool;

said angular drive means comprising a pinion, a beveled cogwheel, and a hollow driveshaft having an axis;

a spindle positioned in said driveshaft;

housing means for housing said drive means;

displacing means, said spindle being positioned in said driveshaft so that it cannot rotate relative to the driveshaft but can be displaced axially from outside said housing means by said displacing means;

activating means in said displacing means;

traveling means and a terminal component, said spindle having an appendage;

resilient means between a face of said driveshaft and said appendage on said spindle, said activating means in said displacing means acting on said terminal component against a force of said resilient means by use of a surface of said traveling means, said surface being inclined at an angle to the axis of said driveshaft;

.Iaddend.a bushing-shaped cover for limiting a stroke and attached to said driveshaft;

a bushing with a flange .[.lifted away from.]. .Iadd.for engaging .Iaddend.the tool.[.,.]. .Iadd.; and

.Iaddend.a bolt with a flange screwed into .[.another face.]. .Iadd.an end .Iaddend.of said spindle.[.and.]. .Iadd., said bushing being .Iaddend.positively .[.connected by said flange on said bolt through said flange on said bushing lifted away from the tool and thereby from the flange on said bushing.]. .Iadd.connectable with said end of said spindle.Iaddend.. .[.15. Apparatus according to claim 1, wherein said bushing has surface with cylindrical section, said cylindrical section having positive-locking means comprising teeth, parallel to an axis of said bushing..]. .[.16. Apparatus according to claim 15, including teeth between both said flanges, said teeth having a depth which is less than a stroke of said displacing means..]. .[.17. Apparatus according to claim 14, wherein said bolt has means for producing manipulation at an edge of said flange on said bolt..]. .[.18. Apparatus according to claim 16, wherein said teeth between said flanges extend over part of a radial expansion..]. .[.19. Apparatus according to claim 14, wherein an end of said bolt remote from the flange on said bolt is threaded..]. .[.20. Apparatus according to claim 14, wherein said spindle has a face with a threaded bore..]. .[.21. Apparatus according to claim 19, wherein said spindle has internal threads;

theads on said bolt and the threads in said spindle being long enough for adapting to tools varying in thickness..].

6. [.22. Apparatus according to claim 14, including appendages on a mating flange, said tool being centered on said appendages on said mating flange and on said flange on said bushing..]. .Iadd.23. A tool driving unit for a portable power-tool, comprising:

a housing;

a hollow outer spindle having an axis;

an inner spindle within the outer spindle, one of the spindles being slidable with respect to the other spindle in the axial direction of the outer spindle;

tool holding means, connected to the outer spindle and to the inner spindle, for releasably holding a tool, the tool holding means including a first flange element connected to the outer spindle and a second flange element connectable to the inner spindle at a position adjacent the first flange element, the second flange element being detachable from the inner spindle;

spring means for biassing the inner spindle and outer spindle with respect to each other to urge the flange elements toward each other;

an actuating element which is movable from outside the housing, by a manually applied force, between a release position and an operating position; and

release means, multiplying the force applied to the actuating element, for acting on one of the spindles to displace said one of the spindles axially against the force of the spring means when the actuating element is moved from its operating position toward its release position, the axial displacement moving the flange elements apart so that the second flange element can be manually detached from the inner spindle without tools, said release means not acting on said one of the spindles when the

7. actuating element is in its operating position. .Iaddend. .Iadd.24. The tool driving unit of claim 23, wherein the release means comprises a pressure element connected to the actuating element, the pressure element having a surface with at least one portion which is inclined and extends transverse to the axis of the outer spindle and which causes the pressure element to bear against the slidable spindle when the actuating element is moved from its operating position to its release position. .Iaddend. .Iadd.25. The tool driving unit of claim 24, wherein the housing has a threaded opening, wherein the pressure element has a periphery, and wherein the at least one inclined portion of the surface of the pressure element comprises a thread on the periphery of the pressure element so that the pressure element screws into the threaded opening in the housing.

8. Iaddend. .Iadd.26. The tool driving unit of claim 24, wherein the at least one inclined portion of the surface of the pressure element faces the slidable spindle and slidably engages the slidable spindle as the actuating element is moved from its operating position to its release position. .Iaddend. .Iadd.27. The tool driving unit of claim 24, wherein the actuating element is elongated and has an axis, wherein the housing comprises means mounting the actuating element for axial movement, with the axis of the actuating element being transverse to the axis of the outer spindle, and wherein the at least one inclined portion of the surface of the pressure element is transverse to the axis of the actuating element in addition to being transverse to the axis of the outer spindle. .Iaddend. .Iadd.28. The tool driving unit of claim 23, wherein the inner spindle has a threaded end, and wherein the second flange element has a threaded opening to permit the second flange element to be detachably screwed onto the threaded end of the inner spindle. .Iaddend. .Iadd.29. The tool driving unit of claim 23, further comprising keying means for locking the spindles together with respect to rotation, so that rotation of one spindle causes the other to rotate. .Iaddend. .Iadd.30. The tool driving unit of claim 23, wherein the outer spindle has an end, and further comprising an appendage on the inner spindle, the appendage being spaced apart from the end of the outer spindle, and wherein the spring means is disposed between the end of the outer spindle and the appendage on the inner spindle. .Iaddend. .Iadd.31. The tool driving unit of claim 23, further comprising means attached to one of the spindles and cooperating with the other of the spindles for limiting sliding movement between the spindles. .Iaddend. .Iadd.32. The driving unit of claim 23, wherein the tool holding means additionally comprises clamping means, actuatable by a sliding movement of the spindles when the actuating element is moved from the release position toward the operating position, for gripping the second flange element after it has been manually placed in a receiving position adjacent the clamping means. .Iaddend. .Iadd.33. The driving unit of claim 23, wherein the tool holding means further comprises bushing means, disposed between the flange elements and contacting the second flange element, for isolating the second flange element from torque. .Iaddend. .Iadd.34. A portable power-tool for spinning an exchangeable working tool, comprising:

a housing having an opening;

a hollow outer spindle in the housing, the outer spindle having an axis which extends through the opening;

an inner spindle disposed in the outer spindle, one of the spindles being displaceable in the axial direction with respect to the other spindle;

a first flange element;

means for mounting the first flange element to the outer spindle so that the first flange element is disposed outside the housing and adjacent the opening;

a second flange element;

means for detachably mounting the second flange element to the inner spindle so that the second flange element is disposed outside the housing adjacent the first flange element;

spring means for biassing the displaceable spindle to clamp a working tool that has been placed between the flange elements;

an actuating member having a manually engageable portion and having a contact area; and

means for mounting the actuating member so that the contact area is adjacent the displaceable spindle and the manually engageable portion extends outside the housing, the manually engageable portion being manually movable along a path between an operating position and a release position, the contact area, in the course of said movement of said manually engageable portion from the operating position toward the release position, being moved over a distance shorter than said path and pressing against the displaceable spindle to slide the displaceable spindle against the force of the spring means so that the second flange element can be manually detached during an exchange of working tools. .Iaddend.

9. Iadd. The portable power-tool of claim 34, wherein the actuating member comprises a lever, and wherein the means for mounting comprises means for rotatably mounting the lever on the housing. .Iaddend. .Iadd.36. The portable power-tool of claim 34, wherein the actuating member is movable in a direction transverse to the axis of said hollow spindle, and wherein the means for mounting comprises means for guiding the actuating member on the housing so that the actuating member is slidable along that direction. .Iaddend. .Iadd.37. The portable power-tool of claim 34, further comprising a cover element attached to the outer spindle, the cover element having an opening through which the inner spindle extends, and wherein the spring means is disposed inside the cover element. .Iaddend. .Iadd.38. The portable power-tool of claim 34, wherein the means for detachably mounting the second flange element additionally comprises clamping means, actuatable by movement of the displaceable spindle when the manually engageable portion of the actuating member is moved from its release position toward its operating position, for gripping the second flange element after it has been manually placed in a receiving position adjacent the clamping means. .Iaddend. .Iadd.39. The portable power-tool of claim 38, wherein the means for detachably mounting the second flange element additionally comprises means, extending parallel to the axis of the outer spindle, for keying the second flange element to the outer spindle so that the second flange element is slidable but not rotatable with respect to the outer spindle. .Iaddend. .Iadd.40. The portable power-tool of claim 34, wherein the working tool has an opening through which the means for detachably mounting extends, and further comprising a bushing member between the second flange element and the working tool, and means extending through the opening in the working tool for keeping the bushing member from rotating with respect to the outer spindle. .Iaddend. .Iadd.41. A tool driving unit for a power-tool comprising:

a hollow outer spindle having an axis;

an inner spindle within the outer spindle, one of the spindles being slidable in the axial direction with respect to the other spindle;

means for selectively shifting one of the spindles with respect to the other spindle between a release position and a clamp position; and

tool holding means, connected to the spindles, for releasably holding a tool, the tool holding means including

a first flange element connected to one of the spindles,

a second flange element, and

clamping means, connected to the other spindle and actuatable by a shifting movement of the spindles from the release position toward the clamp position, for gripping the second flange element after it has been manually placed in a receiving position adjacent the clamping means and for moving the second flange element toward the first flange element to

10. clamp the tool between the flange elements. .Iaddend. .Iadd.42. The tool driving unit of claim 41, wherein the clamping means comprises gripping appendages attached to said other spindle. .Iaddend. .Iadd.43. The tool driving unit of claim 42, wherein the gripping appendages are actuatable by a flared portion either at the gripping appendages or at said one of the spindles. .Iaddend. .Iadd.44. The tool driving unit of claim 43, wherein the first flange element is connected to the outer spindle, wherein the outer spindle has a flared portion;

and wherein the gripping appendages comprise an end portion of the inner spindle, the end portion being flared and fitting within the flared portion of the outer spindle, the end portion of the inner spindle having a bore and having at least one slot which extends outward from the bore for forming the gripping appendages. .Iaddend. .Iadd.45. The tool driving unit of claim 44, wherein the second flange element comprises a flange portion, a pin portion which fits into the bore, and a connecting portion between the flange portion and the pin portion, and wherein the clamping means further comprises at least one abutment on the pin portion, and at least one abutment which is attached to the gripping appendages to grip onto the at least one abutment on the pin portion when the spindles are selectively shifted from their release position to their clamp position. .Iaddend. .Iadd.46. The tool driving unit of claim 45, wherein the at least one abutment attached to the gripping appendages comprises a plurality of annular ridges which project into the bore, and wherein the at least one abutment on the pin portion comprises plurality of annular ridges. .Iaddend. .Iadd.47. The tool driving unit of claim 45, wherein the connecting portion has an annular groove between the pin portion and the flange portion, and further comprising a stop ring in the annular groove. .Iaddend. .Iadd.48. The tool driving unit of claim 45, further comprising means for keying the connecting portion to the outer spindle so that the connecting portion

11. cannot rotate with respect to the outer spindle. .Iaddend. .Iadd.49. The tool driving unit of claim 41, wherein the means for selectively shifting comprises:

spring means for biassing the spindles toward the clamp position;

an actuating member having a manually engageable portion and having a contact area; and

means for mounting the actuating member so that the actuating member is movable between first and second positions by a force manually applied to the manually engageable portion, the contact area of the actuating member pressing on the slidable spindle to shift the spindles from the clamp position toward the release position when the actuating member is moved from its first position toward its second position, the force exerted by the contact area on the slidable spindle when the actuating member is moved from its first position toward its second position being greater than the force applied to the manually engageable portion to move the actuating member from its first position to its second position. .Iaddend. .Iadd.50. A tool driving unit for a power-tool, comprising;

a drive member having an axis; and

tool holding means, connected to the drive member, for releasably holding a tool, the tool holding means including

a first clamping flange affixed to the drive member;

a bushing flange,

a second clamping flange,

means for detachably connecting the second clamping flange to the drive member, with the second clamping flange pressing the bushing flange toward the first clamping flange, and with the tool being disposed between the bushing flange and the first clamping flange, and

keying means for non-rotatably holding the bushing member with respect to the first clamping flange while permitting the bushing flange to move

4. conical surface in vicinity of said slots..]. .[.8. Apparatus according to claim 7, wherein said driveshaft has an internal conical surface in vicinity of said external conical surface..]. .[.9. Apparatus according to claim 7, wherein said spindle has a bore of an end of said engine, said end having said slots..]. .[.10. Apparatus according to claim 9, wherein said bore has positive-locking means comprising transverse grooves in a wall of said bore..]. .[.11. Apparatus according to claim 6, including a securing bolt connected releasably by said tensioning means to said spindle..]. .[.12. Apparatus according to claim 11, wherein said spindle has an end face with a bore having a wall with grooves, said securing bolt having a pin at an end toward said tensioning means, said pin having a surface with positive-locking means comprising transverse grooves engaging the grooves in said wall of said bore..]. .[.13. Apparatus according to claim 11, including resilient snap-in means, said securing bolt having

12. axially with respect to the drive member. .Iaddend. .Iadd.51. The tool driving unit of claim 50, wherein the drive member comprises a hollow outer spindle, and an inner spindle which is slidably disposed in the outer spindle, wherein the first clamping flange is affixed to the outer spindle, and wherein the means for detachably connecting the second clamping flange to the drive member comprises means for detachably connecting the second clamping flange to the inner spindle. .Iaddend. .Iadd.52. The tool driving unit of claim 51, further comprising;

spring means for biassing the inner spindle away from the first clamping flange so as to urge the second clamping flange toward the tool;

an actuating member having a manually engageably portion and having a contact area; and

means for mounting the actuating member so that the contact area is adjacent the inner spindle and so that the manually engageable portion is manually movable along a path between an operating position and a release position, the contact area, in the course of said movement of said manually engageable portion from the operating position toward the release position, being moved over a distance shorter than said path and pressing against the inner spindle to slide the inner spindle toward the first clamping flange against the force of the spring means so that the second

13. flange element can be manually detached. .Iaddend. .Iadd.53. The tool driving unit of claim 52, wherein the tool has an opening, and wherein the means for detachably connecting the second clamping flange to the inner spindle comprises a threaded bolt which extends through the opening in the tool. .Iaddend. .Iadd.54. The tool driving unit of claim 53, wherein the keying means comprises a keying element which contacts the bushing flange and which extends through the opening in the tool. .Iaddend. .Iadd.55. The tool driving unit of claim 54, wherein the keying element comprises a hollow sleeve affixed to the bushing flange, the threaded bolt extending through the hollow sleeve. .Iaddend. .Iadd.56. The tool driving unit of claim 55, wherein the bushing flange has a surface which contacts a surface of the second clamping flange, and further comprising further keying elements on the surface of the bushing flange which contacts the second clamping flange, and additional keying elements on the surface of the second clamping flange which contacts the bushing flange. .Iaddend. .Iadd.57. The tool driving unit of claim 56, wherein the further keying elements on the bushing flange and the additional keying elements on the second clamping flange have a keying depth that is selected so that the further keying elements on the bushing flange are spaced apart from the additional keying elements on the second clamping flange when the actuating member is in its release position. .Iaddend. .Iadd.58. The tool driving unit of claim 50, wherein the tool has an opening through which the means for detachably connecting extends, and wherein the keying means comprises a keying element which contacts the bushing flange and which extends through the opening in the tool. .Iaddend. .Iadd.59. The tool driving unit of claim 58, wherein the means for detachably connecting comprises a threaded bolt, and wherein the keying element comprises a hollow sleeve attached to the bushing flange, the threaded bolt extending through the hollow sleeve. .Iaddend. .Iadd.60. The tool driving unit of claim 59, wherein the keying means further comprises at least one abutment on the hollow sleeve, and at least one further abutment on one of the inner spindle, outer spindle, and first clamping flange to slidably engage the at least one abutment on the hollow sleeve. .Iaddend.