US3816015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick-change chuck
Assignee: Bilz Werkzeugfabrik GmbH and Co KG
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Filing: 1972-01-11
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Granted: 1974-06-11
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Expires: 1992-01-11
Abstract
Abstract A quick change chuck of the type which by the manipulation of an outer control sleeve, a tool-holding collet may be quickly mounted in or removed from a tubular spindle head. The outer end of the collet carries a nut which has an annular groove into which locking balls may engage which are slidable in radial bores in a ball-holding sleeve which is mounted on the outer surface of the spindle head. By sliding the outer control sleeve back or forth along this ball-holding sleeve, the balls will either be pressed partly into the groove in the nut so as to connect the nut and the ball-holding sleeve to each other or the balls will be radially released from the nut and pass partly into an inner recess in the control sleeve. The ball-holding sleeve is also slidable for a limited distance along the spindle head against the action of a spring from a forward idling position to a rear working position of this sleeve and also of the collet. The ballholding sleeve and the collet remain in the idling position, for example, when the machine is stopped or when the collet carries no tool or a broken tool, and they are shifted to the working position by the cutting pressure of the tool upon a workpiece. One or the other of these positions may be indicated by a measuring instrument, for example, an electronic switch or a countertube, the actuation of which may also be used for controlling the operation of the machine.
Inventors
- 👤 O Bilz
- 👤 O Fauth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:50
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/107; B23B31/1071; B23B31/028; B23B49/00; B23B49/001; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17666; Y10T279/17692; Y10T279/17743; Y10T279/17752; Y10T279/17761; Y10T279/17811; Y10T408/00; Y10T408/13; Y10T408/14; Y10T408/94
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
299 words
In a quick-change chuck comprising a spindle head having an axial bore, a collet for holding a tool adapted to be inserted into said bore so as to be non-rotatable relative to said spindle head, a nut screwed upon the front end of said collet, said nut having a rear part of a smaller diameter with a rear end surface facing the front end surface of said spindle head, said rear part of said nut having a peripherial groove the lateral flanks of which taper toward the bottom of said groove, a ball-holding sleeve axially slidable along the outer surface of said spindle head, said ball-holding sleeve having on its front end an annular flange of a smaller diameter and an inner shoulder facing the end surface of said spindle head, an outer control sleeve slidable in its axial direction along the outer surface of said ball-holding sleeve, said flange having radial bores, locking balls slidable in said bores and partly engaging into said peripheral groove under the pressure of said control sleeve when the latter is shifted in one axial direction, said locking balls disengaging from said groove when said control sleeve is shifted in the other axial direction, means for limiting the displacement of said ball-holding sleeve, and spring means for maintaining said ballholding sleeve, said collet and said nut in an idling position when said spindle head is stopped or runs idle, said limiting means being axially spaced from said end surface of said spindle head in said idling position, said ball-holding sleeve, said collet and said nut being displaced from said idling position to a working position when a tool mounted in said collet presses axially against a workpiece, said limiting means abutting against said end surface of said spindle head in said working position.
Claim 2
Dependent Claim
299 words
In a quick-change chuck comprising a spindle head having an axial bore, a collet for holding a tool adapted to be inserted into said bore so as to be non-rotatable relative to said spindle head, a nut screwed upon the front end of said collet, said nut having a rear part of a smaller diameter with a rear end surface facing the front end surface of said spindle head, said rear part of said nut having a peripherial groove the lateral flanks of which taper toward the bottom of said groove, a ball-holding sleeve axially slidable along the outer surface of said spindle head, said ball-holding sleeve having on its front end an annular flange of a smaller diameter and an inner shoulder facing the end surface of said spindle head, an outer control sleeve slidable in its axial direction along the outer surface of said ball-holding sleeve, said flange having radial bores, locking balls slidable in said bores and partly engaging into said peripheral groove under the pressure of said control sleeve when the latter is shifted in one axial direction, said locking balls disengaging from said groove when said control sleeve is shifted in the other axial direction, means for limiting the displacement of said ball-holding sleeve, and spring means for maintaining said ballholding sleeve, said collet and said nut in an idling position when said spindle head is stopped or runs idle, said limiting means being axially spaced from said end surface of said spindle head in said idling position, said ball-holding sleeve, said collet and said nut being displaced from said idling position to a working position when a tool mounted in said collet presses axially against a workpiece, said limiting means abutting against said end surface of said spindle head in said working position.
Claim 3
Dependent Claim
97 words
A quick-change chuck as defined in claim 1, in which at least one of said ball-holding and control sleeves is provided with an elongated hole extending in the axial direction of said sleeve, said spindle head having a tapped radial bore, a setscrew screwed into said bore and its outer end extending into and slidable along said elongated hole, the rear end of said hole forming a stop for limiting the distance to which said inner shoulder may be moved to said idling position by said spring means away from the end surface of said spindle head.
Claim 4
Dependent Claim
43 words
A quick-change chuck as defined in claim 2, in which said limiting means is a second inner shoulder forwardly of said first shoulder, said spring means being inserted into the space between said first shoulder and said end surface of said spindle head.
Claim 5
Dependent Claim
39 words
A quick-change chuck as defined in claim 2, in which said spring means are inserted between the rear end of said collet and the bottom of said axial bore in said spindle head into which said collet is inserted.
Claim 6
Dependent Claim
72 words
A quick-change chuck as defined in claim 2, further comprising an additional sleeve axially slidable on said spindle head, and extending said ball-holding sleeve toward the rear, said spring means disposed within said additional sleeve and the front end thereof pressing the front of said additional sleeve into engagement with the rear end of said ball-holding sleeve, and means for connecting the rear end of said additional sleeve to said spindle head.
Claim 7
Dependent Claim
30 words
A quick-change chuck as defined in claim 2, further comprising means spaced from said spindle head for sensing one of said idling or said working position of said spindle head.
Claim 8
Dependent Claim
112 words
A quick-change chuck as defined in claim 6, in which said sensing means comprises an electronic switch connected to and movable at least in the axial direction with said spindle head, said electronic switch extending substantially at a right angle to said spindle head with the free end thereof located at a small distance in the radial direction from said spindle head so as to fOrm an intervening space whereby when said ball-holding sleeve is moved from said idling position to said working position against the action of said spring means, the rear end of at least one of said sleeves passes into said space so that said switch will be actuated.
Claim 9
Dependent Claim
21 words
A quick-change chuck as defined in claim 6, in which said sensing means comprises a means for sending and receiving rays.
Claim 10
Dependent Claim
81 words
A quick-change chuck as defined in claim 8, in which said spindle head has a peripheral groove in its outer surface, and further comprising a radiating ring inserted into said groove, said ring being covered by the rear end of said ball-holding sleeve when in said working position and exposed toward said sensing means when in said idling position whereby in said idling position the rays emanating from said ring will impinge upon said sensing means to effect a control operation.
Claim 11
Dependent Claim
95 words
A quick-change chuck as defined in claim 6, in which said sensing means includes means for sending and receiving rays, said spindle head having a peripheral groove in its outer surface, and further comprising a reflecting ring inserted into said groove and covered by the rear end of said ball-holding sleeve when in said working position and exposed to said sensing means when in said idling position so that in said idling position the rays emanating from said sensing means will be reflected by said ring to said sensing means to effect a control operation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |