US4240645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force-compensated split-jaw lathe chuck
Assignee: Individual
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Filing: 1979-07-20
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Granted: 1980-12-23
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Expires: 1999-07-20
Abstract
Abstract A lathe chuck has a chuck body rotatable about a chuck axis and formed with a plurality of angularly spaced radially extending inner guides receiving respective inner jaw parts and with a plurality of angularly spaced and radially extending outer guides receiving respective outer jaw parts. An operating element is engageable with the inner jaw parts for radially displacing same in the chuck body in the respective inner guides. Coupling members are each axially displaceable by respective radially displaceable cams in the inner jaw parts and are each displaceable between a coupling position engaging the respective outer jaw part and coupling same to the respective inner jaw part for joint radial movement thereof, and a decoupling position for relative radial displacement of the respective jaw parts. Adjacent each of the jaws is a radially displaceable weight, and a first-class lever has a center fulcrumed in the chuck body, a rear end in radial force-transmitting engagement with the respective weight, and a front end in radial force-transmitting engagement with the respective inner jaw part, to convert centrifugally outwardly effective forces in the weights to centrifugally inwardly effective forces in the inner jaw parts. The front ends of the levers are pivoted in the respective inner jaw parts, and each cam is engageable on displacement into the decoupling position with the respective front lever end to displace the respective coupling member into the decoupling position.
Inventors
- 👤 Gunter H. Rohm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:27
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/16; B23B31/16233; B23B31/16237; B23B31/14; B23B31/142; B23B31/16245; Y; Y10; Y10T; Y10T279/00; Y10T279/19; Y10T279/1973; Y10T279/24; Y10T279/243
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
269 words
A lathe chuck comprising: a chuck body rotatable about a chuck axis and formed with a plurality of angularly spaced and radially extending inner guides and with a plurality of angularly spaced and radially extendng outer guides; respective inner and outer jaw parts radially displaceable in said chuck body in said inner and outer guides; means including at least one operating element engageable with said inner jaw parts for radially displacing same in said chuck body in the respective inner guides; respective coupling members axially displaceable in said inner jaw parts and each displaceable between a coupling position engaging the respective outer jaw part and coupling same to the respective inner jaw part for joint radial movement therewith and a decoupling position for relative radial displacement of the respective jaw parts; respective cams radially displaceable in said inner jaw parts in engagement with the respective coupling members between radially outer positions holding the respective coupling members in said coupling positions and radially inner positions in which the respective coupling members can assume said decoupling positions; respective weights radially displaceable on said chuck body adjacent said inner jaw parts; respective levers centrally fulcrumed in said body and having axial back ends in radial force-transmitting engagement with said weights and axial front ends in radial force-transmitting engagement with the respective inner jaw parts, said levers being pivotal on said body first-class fashion with opposite radial displacement of the respective ends; and respective means for connecting said levers for going axial displacement with the respective coupling members, said levers being axially limitedly displaceable relative to the respective weights and to said body.
Claim 2
Dependent Claim
269 words
A lathe chuck comprising: a chuck body rotatable about a chuck axis and formed with a plurality of angularly spaced and radially extending inner guides and with a plurality of angularly spaced and radially extendng outer guides; respective inner and outer jaw parts radially displaceable in said chuck body in said inner and outer guides; means including at least one operating element engageable with said inner jaw parts for radially displacing same in said chuck body in the respective inner guides; respective coupling members axially displaceable in said inner jaw parts and each displaceable between a coupling position engaging the respective outer jaw part and coupling same to the respective inner jaw part for joint radial movement therewith and a decoupling position for relative radial displacement of the respective jaw parts; respective cams radially displaceable in said inner jaw parts in engagement with the respective coupling members between radially outer positions holding the respective coupling members in said coupling positions and radially inner positions in which the respective coupling members can assume said decoupling positions; respective weights radially displaceable on said chuck body adjacent said inner jaw parts; respective levers centrally fulcrumed in said body and having axial back ends in radial force-transmitting engagement with said weights and axial front ends in radial force-transmitting engagement with the respective inner jaw parts, said levers being pivotal on said body first-class fashion with opposite radial displacement of the respective ends; and respective means for connecting said levers for going axial displacement with the respective coupling members, said levers being axially limitedly displaceable relative to the respective weights and to said body.
Claim 3
Dependent Claim
53 words
The chuck defined in claim 1 wherein the connecting means each include a pivot defining a respective skew pivot axis for the respective front end, said skew axes lying generally at the intersection of two planes, one of which is parallel to and the other of which is perpendicular to said chuck axis.
Claim 4
Dependent Claim
55 words
The chuck defined in claim 2 wherein each of said coupling members is formed at the respective skew axis with a pair of axially confronting and axially open recesses flanking the respective front end, said pivots including a pair of balls at each end of said front ends engaged in the respective pair of recesses.
Claim 5
Dependent Claim
26 words
The chuck defined in claim 3 wherein each front end is formed along the respective skew axis with a respective transverse passage receiving the respective balls.
Claim 6
Dependent Claim
37 words
The chuck defined in claim 4 wherein each of said levers is formed with a longitudinal passage crossing the respective transverse passage and provided with a respective longitudinal pin holding the respective balls in the respective recesses.
Claim 7
Dependent Claim
32 words
The chuck defined in claim 1 wherein each of said ends is partly spherical, said weights and coupling members being formed with axially extending cylindrical cutouts snugly received in the respective ends.
Claim 8
Dependent Claim
42 words
The chuck defined in claim 6 wherein said body is formed at each of said levers axially between the respective ends with a cylindrical fulcrum passage, each lever having a part-spherical center axially displaceable and snugly received in the respective fulcrum passage.
Claim 9
Dependent Claim
25 words
The chuck defined in claim 7, wherein said body includes a fulcrum ring having a plurality of angularly offset cylindrical cutouts constituting said fulcrum passages.
Claim 10
Dependent Claim
63 words
The chuck defined in claim 1 wherein said coupling members are axially slidable in the respective inner jaw parts and are formed with respective radially extending passages through which the respective cams extend, and with respective axially backwardly open passages into which the respective levers extend, said cams being engageable with said levers and being operatively engageable therethrough with the respective coupling members.
Claim 11
Dependent Claim
34 words
The chuck defined in claim 9 wherein said front ends and said cams have respective surfaces inclined to said chuck axis and flatly engageable with one another on radial inward displacement of said cams.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |