US3790182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toolholder
Assignee: Santrade Ltd
•
Filing: 1972-06-05
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Granted: 1974-02-05
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Expires: 1992-06-05
Abstract
Abstract An improved toolholder includes a collet which engages a presetting or adjusting nut on the shank of a tool to retain the tool against movement relative to a spindle. The collet has jaws with gripping surfaces which are disposed in abutting planar engagement with a conical chamfer surface on an axially outer face of the presetting nut when the collet is in a closed condition. The collet is operated between the open and closed conditions by a sleeve having camming surfaces which are pressed against outer surfaces of the collet jaws under the influence of a biasing spring when the collet is in the closed condition. In one specific embodiment of the invention, an ejector is provided to move the tool outwardly as the collet is opened. The collet may be retained in the open condition by a locking assembly which is automatically released upon insertion of a tool into the collet.
Inventors
- 👤 R Schuman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:43
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/20; B23B31/208; B23B31/028; Y; Y10; Y10S; Y10S279/00; Y10S279/904; Y10T; Y10T279/00; Y10T279/17; Y10T279/17291; Y10T279/17307; Y10T279/17411; Y10T279/17487; Y10T279/17521
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
400 words
An apparatus for holding tools having a shank with a presetting nut disposed thereon for engaging a reference surface to determine the extent to which the shank projects from a spindle socket, said apparatus comprising collet means operable between an open position and a closed position grippingly engaging the presetting nut, said collet means including a base fixedly connected with the spindle and a plurality of resiliently deformable gripper fingers extending axially outwardly from said base and having outer end portions which are disposed in engagement with a truncated conical surface on an axially outermost face of the presetting nut when said collet is in the closed condition, said outer end portions of said gripper fingers defining a circular opening through which at least a portion of said presetting nut moves to bring a radially extending surface on an axially innermost face of said presetting nut adjacent to the reference surface when said collet means is in open condition, said outer end portions of said gripper fingers each including an arcuate inner surface disposed on an inner side of the associated gripper finger and which is positioned in abutting planar engagement with the truncated conical outer surface of the presetting nut and forms a portion of a first cone which is coaxial with the shank of the tool when said collet means is in the closed condition, said outer end portions of said gripper fingers each including an arcuate outer surface disposed on an outer side of the associated gripper finger and which forms a portion of a second cone which is coaxial with the first cone, actuator means for effecting operation of said collet means between the open and closed positions, said actuator means including an axially movable sleeve circumscribing said gripper fingers, said sleeve including a truncated conical inner surface means disposed in a coaxial relationship with said second cone for camming said outer end portions of said resilient gripper fingers inwardly to operate said collet means from the open condition to the closed condition, and resilient means for applying a biasing force to said sleeve when said collet means is in the closed position to press said truncated conical inner surface of said sleeve against said arcuate outer surfaces of said gripper fingers and to maintain said arcuate inner surfaces of said gripper fingers in pressure engagement with the truncated conical outer surface of the presetting nut.
Claim 2
Independent Claim
400 words
An apparatus for holding tools having a shank with a presetting nut disposed thereon for engaging a reference surface to determine the extent to which the shank projects from a spindle socket, said apparatus comprising collet means operable between an open position and a closed position grippingly engaging the presetting nut, said collet means including a base fixedly connected with the spindle and a plurality of resiliently deformable gripper fingers extending axially outwardly from said base and having outer end portions which are disposed in engagement with a truncated conical surface on an axially outermost face of the presetting nut when said collet is in the closed condition, said outer end portions of said gripper fingers defining a circular opening through which at least a portion of said presetting nut moves to bring a radially extending surface on an axially innermost face of said presetting nut adjacent to the reference surface when said collet means is in open condition, said outer end portions of said gripper fingers each including an arcuate inner surface disposed on an inner side of the associated gripper finger and which is positioned in abutting planar engagement with the truncated conical outer surface of the presetting nut and forms a portion of a first cone which is coaxial with the shank of the tool when said collet means is in the closed condition, said outer end portions of said gripper fingers each including an arcuate outer surface disposed on an outer side of the associated gripper finger and which forms a portion of a second cone which is coaxial with the first cone, actuator means for effecting operation of said collet means between the open and closed positions, said actuator means including an axially movable sleeve circumscribing said gripper fingers, said sleeve including a truncated conical inner surface means disposed in a coaxial relationship with said second cone for camming said outer end portions of said resilient gripper fingers inwardly to operate said collet means from the open condition to the closed condition, and resilient means for applying a biasing force to said sleeve when said collet means is in the closed position to press said truncated conical inner surface of said sleeve against said arcuate outer surfaces of said gripper fingers and to maintain said arcuate inner surfaces of said gripper fingers in pressure engagement with the truncated conical outer surface of the presetting nut.
Claim 3
Dependent Claim
41 words
An apparatus as set forth in claim 1 further including tool ejector means for moving the innermost face of the presetting nut away from the reference surface upon operation of said collet means from the closed position to the open position.
Claim 4
Dependent Claim
46 words
An apparatus as set forth in claim 1 further including means for moving the innermost face surface of the presetting nut and the reference surface axially outwardly relative to the spindle socket upon operation of said collet means from thE closed position to the open position.
Claim 5
Independent Claim
204 words
An apparatus for holding tools having a shank with a presetting nut disposed thereon for engaging a reference surface to determine the extent to which the shank projects from a spindle, said apparatus comprising a collet adapted to be connected with a spindle and operable between an open condition and a closed condition in which said collet engages a surface on an axially outer face of the presetting nut and presses an axially inner surface on the presetting nut against the reference surfaces, said collet including gripper means for abuttingly engaging the surface on the axially outer face of the presetting nut, said gripper means including a base adapted to be fixedly connected to the spindle and a plurality of resiliently deflectable gripper fingers extending axially outwardly from said base, each of said gripper fingers including an inner surface, and actuator means for effecting operation of said collet between the open condition and the closed conditions, said actuator means including means for deflecting said gripper fingers inwardly toward the presetting nut to press said inner surfaces on said gripper fingers into abutting engagement with the surface on the axially outer face of the presetting nut upon operation of said collet to the closed condition.
Claim 6
Independent Claim
204 words
An apparatus for holding tools having a shank with a presetting nut disposed thereon for engaging a reference surface to determine the extent to which the shank projects from a spindle, said apparatus comprising a collet adapted to be connected with a spindle and operable between an open condition and a closed condition in which said collet engages a surface on an axially outer face of the presetting nut and presses an axially inner surface on the presetting nut against the reference surfaces, said collet including gripper means for abuttingly engaging the surface on the axially outer face of the presetting nut, said gripper means including a base adapted to be fixedly connected to the spindle and a plurality of resiliently deflectable gripper fingers extending axially outwardly from said base, each of said gripper fingers including an inner surface, and actuator means for effecting operation of said collet between the open condition and the closed conditions, said actuator means including means for deflecting said gripper fingers inwardly toward the presetting nut to press said inner surfaces on said gripper fingers into abutting engagement with the surface on the axially outer face of the presetting nut upon operation of said collet to the closed condition.
Claim 7
Dependent Claim
83 words
An apparatus as set forth in claim 4 wherein said actuator means is operable from a first condition to a second condition to enable said gripper fingers to flex radially outwardly away from the presetting nut and thereby effect operation of said collet from the closed condition to the open condition, said apparatus further including means for moving the tool axially outwardly relative to the spindle socket in response to operation of said actuator means from the first condition to the second condition.
Claim 8
Dependent Claim
104 words
An apparatus as set forth in claim 4 wherein said gripper fingers define a circular opening having a diameter which is greater than the maximum external diameter of the presetting nut when said collet is in the open condition to enable the presetting nut to pass through the opening, and wherein said gripper fingers define a circular opening having a diameter which is less than the maximum external diameter of the presetting nut when said collet is in the closed condition to enable said gripper fingers to retain the presetting nut against movement through the opening when said collet is in the closed condition.
Claim 9
Dependent Claim
99 words
An apparatus as set forth in claim 4 wherein said actuator means is operable from a first condition to a second condition to effect operation of said collet from the closed condition to the open condition, said apparatus further including releasable locking means for retaining said actuator means in the second condition and said collet in the open condition, and means for releasing said locking means in response to the insertion of a tool into said collet to enable said actuator means to operate to the first condition and thereby effect operation of said collet to the closed condition.
Claim 10
Dependent Claim
32 words
An apparatus as set forth in claim 4 further including tool ejector means for moving a tool axially outwardly upon operation of said collet from a closed condition to an open condition.
Claim 11
Dependent Claim
51 words
An apparatus as set forth in claim 8 wherein said tool ejector means includes pusher means for engaging the presetting nut and spring means for urging said pusher means outwardly to move the tool outwardly under the influence of outwardly directed forces transmitted from said pusher means to the presetting nut.
Claim 12
Dependent Claim
40 words
An apparatus as set forth in claim 9 wherein said pusher means includes surface means for abuttingly engaging a radially extending surface on the presetting nut at a location radially outwardly of the axially inner surface on the presetting nut.
Claim 13
Dependent Claim
35 words
An apparatus as set forth in claim 9 wherein said pusher means includes surface means for abuttingly engaging the axially inner surface on the presetting nut at a location radially outwardly of the reference Surface.
Claim 14
Dependent Claim
41 words
An apparatus as set forth in claim 9 wherein said pusher means includes a radially inwardly projecting portion which is disposed between said reference surface and the presetting nut when said collet is in the closed condition engaging the presetting nut.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |