Patent US3927873A successfully refreshed from Google Patents.
US3927873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-centering chuck
Assignee: Glass Tubes and Components Ltd
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Filing: 1974-07-22
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Granted: 1975-12-23
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Expires: 1994-07-22
Abstract
Abstract A self-centering chuck for holding glassware has two sets of jaws, the jaws of one set being resiliently biassed to hold a workpiece while allowing a positive drive acting on the other set of jaws to centre the workpiece. The resiliently biassed jaws are of arcuate form and are moved in arcuate guides by rack bars which are biassed by springs.
Inventors
- 👤 Arnold Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:15
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/18; B25; B25B; B25B5/00; B25B5/14; Y; Y10; Y10T; Y10T279/00; Y10T279/18; Y10T279/26; Y10T279/29
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
A chuck comprising a body, a foot attached to the body, a first set of movable jaws for holding a workpiece against the foot, each of the jaws of the first set being of arcuate shape and carrying a series of gear teeth in its outer edge, a second set of movable jaws for centering the workpiece upon the chuck, said second of jaws being further from the foot than the first set of jaws, means coupled to said first and second sets of jaws for moving the jaws inwardly and outwardly, said means comprising a plurality of racks each engaging with the teeth of one of the jaws of the first set, and resilient biassing means urging the jaws of the first set resiliently towards the foot, whereby while the workpiece is resiliently held by said first set of jaws the workpiece is shifted into a centred position by said second set of jaws.
Claim 2
Dependent Claim
155 words
A chuck comprising a body, a foot attached to the body, a first set of movable jaws for holding a workpiece against the foot, each of the jaws of the first set being of arcuate shape and carrying a series of gear teeth in its outer edge, a second set of movable jaws for centering the workpiece upon the chuck, said second of jaws being further from the foot than the first set of jaws, means coupled to said first and second sets of jaws for moving the jaws inwardly and outwardly, said means comprising a plurality of racks each engaging with the teeth of one of the jaws of the first set, and resilient biassing means urging the jaws of the first set resiliently towards the foot, whereby while the workpiece is resiliently held by said first set of jaws the workpiece is shifted into a centred position by said second set of jaws.
Claim 3
Dependent Claim
50 words
A chuck as claimed in claim 1, in which each of the jaws of the second set is pivotally mounted and the means for moving the jaws comprises a plurality of push rods each coupled to one of the second set of jaws to swing the jaw about its pivot.
Claim 4
Dependent Claim
45 words
A chuck as claimed in claim 2, in which the coupling between each push rod and its jaw comprises a roller mounted on the push rod and engaging in a slot in the jaw which is transverse to the direction of movement of the rod.
Claim 5
Dependent Claim
63 words
A chuck as claimed in claim 1 in which the said moving means comprise a first control member common to the jaws of the first set and a second control member common to the jaws of the second set and the said resilient biassing means act between the first and second control members, means being provided for positively positioning the second control member.
Claim 6
Dependent Claim
20 words
A chuck as claimed in claim 1 comprising a universal joint coupling the foot to the body of the chuck.
Claim 7
Dependent Claim
165 words
A chuck comprising a body, a foot attached to the body, a first set of movable jaws for holding a workpiece against the foot, a second set of movable jaws for centering the workpiece upon the chuck, said second set of jaws being further from the foot than the first set of jaws, each of the jaws of said second set being pivotally mounted, means coupled to said first and second sets of jaws for moving the jaws inwardly and outwardly, said means comprising a plurality of push rods each having a roller mounted thereon, each of the jaws having a transverse slot in which the roller of one of the said push rods is engaged to swing said jaw about its pivot, and resilient biassing means urging the jaws of the first set resiliently towards the foot, whereby while the workpiece is resiliently held by said first set of jaws the workpiece is shifted into a centred position by said second set of jaws.
Claim 8
Dependent Claim
165 words
A chuck comprising a body, a foot attached to the body, a first set of movable jaws for holding a workpiece against the foot, a second set of movable jaws for centering the workpiece upon the chuck, said second set of jaws being further from the foot than the first set of jaws, each of the jaws of said second set being pivotally mounted, means coupled to said first and second sets of jaws for moving the jaws inwardly and outwardly, said means comprising a plurality of push rods each having a roller mounted thereon, each of the jaws having a transverse slot in which the roller of one of the said push rods is engaged to swing said jaw about its pivot, and resilient biassing means urging the jaws of the first set resiliently towards the foot, whereby while the workpiece is resiliently held by said first set of jaws the workpiece is shifted into a centred position by said second set of jaws.
Claim 9
Dependent Claim
170 words
A chuck comprising a body, a foot attached to the body, a first set of movable jaws for holding a workpiece against the foot, a second set of movable jaws for centering the workpiece upon the chuck, said second set of jaws being further from the foot than the first set of jaws, means coupled to said first and second sets of jaws for moving the jaws inwardly and outwardly, and resilient biassing means urging the jaws of the first set resiliently towards the foot, whereby while the workpiece is resiliently held by said first set of jaws the workpiece is shifted into a centred position by said second set of jaws, wherein said moving means comprise a first control member common to the jaws of the first set and a second set and a second control member common to the jaws of the second set and the said resilient biassing means act between the first and second control members, means being provided for positively positioning the second control member.
Claim 10
Dependent Claim
170 words
A chuck comprising a body, a foot attached to the body, a first set of movable jaws for holding a workpiece against the foot, a second set of movable jaws for centering the workpiece upon the chuck, said second set of jaws being further from the foot than the first set of jaws, means coupled to said first and second sets of jaws for moving the jaws inwardly and outwardly, and resilient biassing means urging the jaws of the first set resiliently towards the foot, whereby while the workpiece is resiliently held by said first set of jaws the workpiece is shifted into a centred position by said second set of jaws, wherein said moving means comprise a first control member common to the jaws of the first set and a second set and a second control member common to the jaws of the second set and the said resilient biassing means act between the first and second control members, means being provided for positively positioning the second control member.
Claim 11
Dependent Claim
20 words
A chuck as claimed in claim 7 comprising a universal joint coupling the foot to the body of the chuck.
Claim 12
Dependent Claim
63 words
A chuck as claimed in claim 7 in which the said moving means comprise a first control member common to the jaws of the first set and a second control member common to the jaws of the second set and the said resilient biassing means act between the first and second control members, means being provided for positively positioning the second control member.
Claim 13
Dependent Claim
58 words
A chuck as claimed in claim 7 in which each of the jaws of the first set is of arcuate shape and carries a series of gear teeth on its outer edge and the means for moving the jaws comprises a plurality of racks each engaging with the teeth of one of the jaws of the first set.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |