Patent US3795406A successfully refreshed from Google Patents.
US3795406A
Expired / Lapsed
US
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Self-tightening drill chuck
Assignee: Individual
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Filing: 1972-07-03
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Granted: 1974-03-05
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Expires: 1992-07-03
Abstract
Abstract A self-tightening drill chuck has a rotatable housing carrying a first element formed with a tapered seat on which a plurality of angularly-spaced wedgelike jaws are provided. A second element axially engages the jaws and either the first or second element is threaded on the housing such that its rotation displaces the jaws radially and axially on the seat to clamp the shank of a tool. A body is provided in the housing to form an abutment for the shank end, this body is connected to the other element by means which translate axial pressure against the body in one direction into opposite axial displacement of the jaws to tighten them while forming a shock-absorbing mechanical cushion. Mechanism is also provided which prevents reverse displacement of the jaws during use of the tool, but which permits such displacement for removal of the tool.
Inventors
- 👤 G Rohm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:10
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/1207; B23B31/1253; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17564; Y10T279/17572; Y10T279/17581; Y10T279/17615; Y10T279/17649; Y10T279/17666; Y10T279/17692; Y10T279/17701; Y10T279/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A chuck comprising: a housing adapted to be rotated about an axis; a fIrst element formed with a tapered seat around said axis; a plurality of wedgelike jaws angularly spaced about the axis of said seat; a second element axially engaging said jaws, one of said elements threadedly engaging said housing for rotation to displace said jaws axially and radially on said seat to radially clamp the shank of a tool received by said jaws, the other element being axially displaceable in said housing; a body in said housing forming an abutment for said shank; and means interconnecting said body and said other element for converting axial force exerted by said tool against said body into an axial force in the opposite direction against said other element while forming a mechanical cushion.
Claim 2
Dependent Claim
132 words
A chuck comprising: a housing adapted to be rotated about an axis; a fIrst element formed with a tapered seat around said axis; a plurality of wedgelike jaws angularly spaced about the axis of said seat; a second element axially engaging said jaws, one of said elements threadedly engaging said housing for rotation to displace said jaws axially and radially on said seat to radially clamp the shank of a tool received by said jaws, the other element being axially displaceable in said housing; a body in said housing forming an abutment for said shank; and means interconnecting said body and said other element for converting axial force exerted by said tool against said body into an axial force in the opposite direction against said other element while forming a mechanical cushion.
Claim 3
Dependent Claim
37 words
The chuck defined in claim 1, further comprising means cooperating with said other element for retaining same against reverse displacement upon movement of said other element in said opposite direction to tighten said jaws against said shank.
Claim 4
Dependent Claim
32 words
The chuck defined in claim 2 wherein said means interconnecting said body and said other element includes a plurality of radially displaceable wedges engaging said housing, said body, and said other element.
Claim 5
Dependent Claim
20 words
The chuck defined in claim 2 wherein said first element is said one element, said second element being a ring.
Claim 6
Dependent Claim
20 words
The arrangement defined in claim 2 wherein said second element is said one element, said first element being a ring.
Claim 7
Dependent Claim
16 words
The chuck defined in claim 5 wherein said jaws are rotationally coupled to said second element.
Claim 8
Dependent Claim
45 words
The chuck defined in claim 2 wherein said means cooperating with said other element includes a wedge displaceable transverse to said axis and operatively engaged between said other element and said body, and a spring biasing said wedge or urge said jaws against said shank.
Claim 9
Dependent Claim
18 words
The chuck defined in claim 7 wherein said wedge is formed with a central axially extending throughgoing hole.
Claim 10
Dependent Claim
30 words
The chuck defined in claim 8, further comprising means for displacing said wedge transversely to said axis against the force of said spring for releasing said tool from said jaws.
Claim 11
Dependent Claim
31 words
The chuck defined in claim 9 wherein said means for displacing said wedge includes a ring surrounding said housing and formed with a spiral camming surface operatively coupled to said wedge.
References Cited (Backward Citations)
US2553990A
Cited
US2931660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |