US3583715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick change chuck
Assignee: Individual
•
Filing: 1968-09-13
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Granted: 1971-06-08
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Expires: 1988-09-13
Abstract
Abstract This invention relates to a quick change chuck comprising locking means of pins or roller bodies adapted to engage in grooves in a collet, which is intended to be received in a preferably inwardly conically tapering opening within a sleeve in the chuck, which sleeve includes the locking bodies adapted to be locked in locking position by an outer sleeve movably placed on the outside of the chuck sleeve. The invention further relates to a locking device for locking the movable outer sleeve. A chuck of similar type is previously known, at which the locking bodies are adapted to be locked in locking position in relation to the collet by means of an intermediate sleeve placed on the chuck sleeve, which intermediate sleeve is moved into and out of locking position by an outer sleeve cooperating with locking bodies in the intermediate sleeve for moving and locking the same, said intermediate sleeve being provided with members for locking the locking bodies of the collet. The locking bodies for the collet engage in a groove made in the surface of the collet which preferably is given an incline. Chucks of the described kind have the object to render possible, also at rotating chuck, an exchange of the collet, which usually holds a tool or the like. The known embodiment, though rendering possible a rapid and reliable locking even at the rotation of the tool, involves certain disadvantages. At a very rapid rotation, for example, it can happen that the chuck does not lock. The incline of the groove in the collet at the known embodiment is intended to effect a self-tightening of the collet in the conical opening of the chuck sleeve in such a manner, that the collet, which by the resistance in operation is turned, is pressed further down into the opening by help of the inclined groove. At screw cutting, for example, when the tap is to be screwed out of the workpiece, the collet will be turned loose from its engagement in the opening and have too much play. This known embodiment of the collet and chuck locking means, thus, is less adapted for use at certain operations.
Inventors
- 👤 Eric Jahrl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:28
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/107; B23B31/1071; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17666; Y10T279/17692; Y10T279/17743; Y10T279/17752; Y10T279/17761; Y10T279/17811; Y10T279/17863
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
269 words
A quick-change chuck comprising in combination: an inner sleeve having an axial opening with a single conical bearing surface, a collet adapted to fit in said opening in said inner sleeve and having a conical surface which tapers at the same angle as said single conical surface on said sleeve, the only point of direct contact between said collet and said sleeve when said collet is fully inserted into said inner sleeve being along said conical surface on said collet which bears against said single conical bearing surface on said inner sleeve, a unitary outer sleeve encircling said inner sleeve and also at least a portion of said collet and being axially movable between collet-locking and unlocking positions, spring means normally urging said outer sleeve to its said collet-locking position, a plurality of locking bodies circumferentially disposed in the wall of said inner sleeve between said collet and said outer sleeve and in the region of said single conical bearing surface, a plurality of discrete recesses in said collet for receiving said locking bodies, means on said outer sleeve effective only when said outer sleeve is in its said collet-locking position for urging each said locking body into a respective one of said discrete recesses for locking said collet rotationally relative to said inner sleeve, and a second locking means also disposed between said collet and said outer sleeve and operative only when said outer sleeve is in its collet-locking position for urging said collet fully into said opening of said inner sleeve to bring the respective conical surfaces on said inner sleeve and said collet into pressured contact.
Claim 2
Dependent Claim
269 words
A quick-change chuck comprising in combination: an inner sleeve having an axial opening with a single conical bearing surface, a collet adapted to fit in said opening in said inner sleeve and having a conical surface which tapers at the same angle as said single conical surface on said sleeve, the only point of direct contact between said collet and said sleeve when said collet is fully inserted into said inner sleeve being along said conical surface on said collet which bears against said single conical bearing surface on said inner sleeve, a unitary outer sleeve encircling said inner sleeve and also at least a portion of said collet and being axially movable between collet-locking and unlocking positions, spring means normally urging said outer sleeve to its said collet-locking position, a plurality of locking bodies circumferentially disposed in the wall of said inner sleeve between said collet and said outer sleeve and in the region of said single conical bearing surface, a plurality of discrete recesses in said collet for receiving said locking bodies, means on said outer sleeve effective only when said outer sleeve is in its said collet-locking position for urging each said locking body into a respective one of said discrete recesses for locking said collet rotationally relative to said inner sleeve, and a second locking means also disposed between said collet and said outer sleeve and operative only when said outer sleeve is in its collet-locking position for urging said collet fully into said opening of said inner sleeve to bring the respective conical surfaces on said inner sleeve and said collet into pressured contact.
Claim 3
Dependent Claim
85 words
The quick-change chuck of claim 1 in which said second locking means also comprises a plurality of second Locking bodies and at least one additional conical surface on said collet extending outwardly in the direction of entry of said collet into said opening, and means on said outer sleeve effective when said outer sleeve is in its said collet-locking position for urging said second locking bodies against said additional conical surface to thereby urge said collet tightly into said axial opening of said outer sleeve.
Claim 4
Dependent Claim
90 words
The quick-change chuck of claim 2 in which the inner surface of said outer sleeve has at least one annular surface parallel to the axis of said collet and longitudinally disposed to force said first locking bodies into respective ones of said recesses when said outer sleeve is in its said collet-locking position, said inner surface of said outer sleeve having also at least one conical surface disposed to urge said second locking bodies against said conical surface on said collet when said outer sleeve is in its collet-locking position.
Claim 5
Dependent Claim
40 words
The quick-change chuck of claim 2, characterized in that the first and the second sets of locking bodies are spaced axially in two groups, the locking bodies in every group being located on the same circumference of said inner sleeve.
Claim 6
Dependent Claim
134 words
The quick-change chuck of claim 3 in which said locking bodies are balls, the balls of said first locking means having a smaller diameter than the balls of said second locking means, the balls of said first locking means being located axially relative to the balls of said second locking means in the direction of collet insertion, the balls of said first locking means being adapted to lie directly opposite said inner conical surface of said outer sleeve when said outer sleeve is axially moved to its collet unlocking position, whereby the balls of said first locking means can move aside from said recesses in said collet, said outer sleeve further having recesses which lie directly opposite the balls of said second locking means when said outer sleeve is in its collet unlocking position.
Claim 7
Dependent Claim
47 words
The quick-change chuck of claim 2 in which said outer sleeve is mounted rotatably in relation to said inner sleeve, the inner surface of said outer sleeve having at least one cylindrical surface parallel to its axis which bears against a mating cylindrical surface on said collet.
Claim 8
Dependent Claim
44 words
The quick-change chuck of claim 2, said locking bodies of said first locking means engaging in axially elongated recesses in the surface of said collet, the locking bodies of said second locking means bearing against the edge of an annular recess of the collet.
Claim 9
Dependent Claim
19 words
The quick-change chuck of claim 7 which further includes means for securing said outer sleeve directly to said collet.
Claim 10
Dependent Claim
25 words
The quick-change chuck of claim 1, in which the number of said recesses exceeds the number of said locking bodies in said first locking means.
Claim 11
Dependent Claim
265 words
A quick-change chuck comprising in combination: an inner sleeve having a tapered axial opening, a collet adapted to fit into said opening, an outer sleeve encircling said inner sleeve and also at least a portion of said collet and being axially movable between collet-locking and collet-unlocking positions, means normally urging said outer sleeve to its said collet-locking position, a first locking means disposed between said collet and said outer sleeve and operative only when said outer sleeve is in its collet-locking position for locking said collet rotationally relative to said inner sleeve, a second locking means also disposed between said collet and said outer sleeve and operative only when said outer sleeve in in its collet-locking position for urging said collet into said opening of said inner sleeve, a nut threaded to said inner sleeve and movable axially therealong between outer sleeve locking and unlocking positions, a plurality of circumferentially spaced sleeve locking balls axially disposed between said nut and the upper end of said outer sleeve, said inner sleeve being spaced from the inner surface of said outer sleeVe by an amount less than the diameter of said sleeve locking balls, said nut in its locking position urging said sleeve locking balls against the upper end of said outer sleeve to thereby prevent movement of said outer sleeve to its collet-unlocking position, said inner sleeve defining at least one recess for receiving said sleeve locking balls, said nut in its unlocking position permitting entry of said balls into said inner sleeve recess to thereby permit movement of said outer sleeve to its collet-unlocking position.
Claim 12
Dependent Claim
265 words
A quick-change chuck comprising in combination: an inner sleeve having a tapered axial opening, a collet adapted to fit into said opening, an outer sleeve encircling said inner sleeve and also at least a portion of said collet and being axially movable between collet-locking and collet-unlocking positions, means normally urging said outer sleeve to its said collet-locking position, a first locking means disposed between said collet and said outer sleeve and operative only when said outer sleeve is in its collet-locking position for locking said collet rotationally relative to said inner sleeve, a second locking means also disposed between said collet and said outer sleeve and operative only when said outer sleeve in in its collet-locking position for urging said collet into said opening of said inner sleeve, a nut threaded to said inner sleeve and movable axially therealong between outer sleeve locking and unlocking positions, a plurality of circumferentially spaced sleeve locking balls axially disposed between said nut and the upper end of said outer sleeve, said inner sleeve being spaced from the inner surface of said outer sleeVe by an amount less than the diameter of said sleeve locking balls, said nut in its locking position urging said sleeve locking balls against the upper end of said outer sleeve to thereby prevent movement of said outer sleeve to its collet-unlocking position, said inner sleeve defining at least one recess for receiving said sleeve locking balls, said nut in its unlocking position permitting entry of said balls into said inner sleeve recess to thereby permit movement of said outer sleeve to its collet-unlocking position.
Claim 13
Dependent Claim
54 words
The quick-change chuck of claim 10 in which a lock ring on the circumference of said inner sleeve limits movement of said nut, said ring cooperating with a conical surface on said nut and locking said nut by friction in the position where the nut is entirely screwed back to unlock said outer sleeve.
Claim 14
Dependent Claim
68 words
The quick-change chuck of claim 10 in which said nut is provided with a depression for receiving the end of said outer sleeve upon its movement to said collet unlocking position, a flange between said outer sleeve and said nut, said flange being fastened to one of said outer sleeve and nut and movable in the other for sealing the space between the nut and said outer sleeve.
Claim 15
Dependent Claim
28 words
The quick-change chuck of claim 12 in which said means normally urging said outer sleeve to said collet locking position comprises a coil spring positioned in said depression.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |