US3737170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chuck for hammer drills or the like
Assignee: Robert Bosch GmbH
•
Filing: 1970-11-09
•
Granted: 1973-06-05
•
Expires: 1990-11-09
Abstract
Abstract A self-centering drill chuck for use in hammer drills or like impact- and torque-transmitting machines. The shank of the boring or drilling tool is received between and is clamped by three jaws which are slidably guided in the pull-on nut or in the adapter of the chuck. A dished spring is inserted between the jaws and the adapter or nut to undergo deformation when the nut is rotated by a chuck key to thereby prevent a relaxation of the clamping force between the shank of the inserted tool and the jaws while the chuck rotates and receives axially oriented impacts.
Inventors
- 👤 K Wanner
- 👤 M Bleicher
- 👤 H Sigg
- 👤 M Burklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:48
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/1207; B23B31/123; B23B31/1253; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17615; Y10T279/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
A chuck, particularly a self-centering chuck for use in power-operated machines wherein the tool is subjected to impacts, comprising a plurality of clamping elements including at least two jaws movable into clamping engagement with a tool, an adapter member and an adjusting member, said adapter member slidably supporting said jaws for movement toward and away from each other and said members being relatively movable to thereby effect movement of said jaws relative to each other, the tool and the clamping elements together constituting a chain of parts which cooperate to clamp and hold the tool against movement with reference to said jaws, said chain of parts including --in addition to said jaws, said members and the tool-- at least one biasing element which is interposed between and reacts against said adjusting member and bears against said jaws to prevent relaxation of the clamping force between the tool and the jaws when the tool is subjected to impacts.
Claim 2
Dependent Claim
157 words
A chuck, particularly a self-centering chuck for use in power-operated machines wherein the tool is subjected to impacts, comprising a plurality of clamping elements including at least two jaws movable into clamping engagement with a tool, an adapter member and an adjusting member, said adapter member slidably supporting said jaws for movement toward and away from each other and said members being relatively movable to thereby effect movement of said jaws relative to each other, the tool and the clamping elements together constituting a chain of parts which cooperate to clamp and hold the tool against movement with reference to said jaws, said chain of parts including --in addition to said jaws, said members and the tool-- at least one biasing element which is interposed between and reacts against said adjusting member and bears against said jaws to prevent relaxation of the clamping force between the tool and the jaws when the tool is subjected to impacts.
Claim 3
Dependent Claim
16 words
A chuck as defiNed in claim 1, wherein said biasing element includes at least one spring.
Claim 4
Dependent Claim
14 words
A chuck as defined in claim 2, wherein said spring is a dished spring.
Claim 5
Dependent Claim
76 words
A chuck as defined in claim 1, wherein said adjusting member is a pull-on nut which meshes with said adapter member and is provided with an annulus of external teeth, said adapter member having at least one socket adjacent to said annulus to receive the shaft of a toothed chuck key whose teeth are movable into mesh with the teeth of said annulus to facilitate rotation of said adjusting member by way of the chuck key.
Claim 6
Dependent Claim
29 words
A chuck as defined in claim 4, wherein the teeth of said annulus are parallel to the axis of said nut and said socket extends radially of such axis.
Claim 7
Dependent Claim
23 words
A chuck as defined in claim 4, wherein said socket is arranged to receive one shaft of a chuck key having two shafts.
Claim 8
Dependent Claim
18 words
A chuck as defined in claim 4, wherein the teeth of the chuck key form a bevel gear.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |