Patent US3762731A successfully refreshed from Google Patents.
US3762731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chuck for tool
Assignee: Individual
•
Filing: 1971-06-21
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Granted: 1973-10-02
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Expires: 1991-06-21
Abstract
Abstract A chuck for tool in which a collet accommodated in a chuck has its diameter reduced by a clamping ring by threading a rotary ring thereon to hold the shank of a tool inserted in the collet and the turning of the tool is prevented by a bushing inserted in a diametral direction of the collet while the tool is held.
Inventors
- 👤 M Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:45
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/20; B23B31/201; B23B31/202; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17411; Y10T279/17529; Y10T279/17761; Y10T279/17821
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
A chuck comprising a chuck body having an internal cam surface tapering outwardly and opening out of one end of said chuck body, a collet within said cam surface and contracted upon axial movement against said cam surface and having at least one radially extending hole therein, an operating means operatively connected to said chuck body and engaging said collet for moving said collet in said axial direction against said cam surface, a bushing in said hole in said collet and movable in the radial direction of said collet a distance sufficient to permit the inner end thereof to project into the center of said collet, retaining means in said collet normally retaining said bushing in said hole, and a screw extending radially through said chuck body in alignment with said bushing and engaging the outer end of said bushing for urging said bushing inwardly, whereby when a tool shank having a flat side is inserted into said collet with the flat side in alignment with the bushing, the screw can be rotated to urge the bushing against the tool shank and hold it in position thereagainst to prevent rotation of the tool under the effect of large forces on the tool.
Claim 2
Dependent Claim
202 words
A chuck comprising a chuck body having an internal cam surface tapering outwardly and opening out of one end of said chuck body, a collet within said cam surface and contracted upon axial movement against said cam surface and having at least one radially extending hole therein, an operating means operatively connected to said chuck body and engaging said collet for moving said collet in said axial direction against said cam surface, a bushing in said hole in said collet and movable in the radial direction of said collet a distance sufficient to permit the inner end thereof to project into the center of said collet, retaining means in said collet normally retaining said bushing in said hole, and a screw extending radially through said chuck body in alignment with said bushing and engaging the outer end of said bushing for urging said bushing inwardly, whereby when a tool shank having a flat side is inserted into said collet with the flat side in alignment with the bushing, the screw can be rotated to urge the bushing against the tool shank and hold it in position thereagainst to prevent rotation of the tool under the effect of large forces on the tool.
Claim 3
Dependent Claim
75 words
A chuck as claimed in claim 1 in which said retaining means is spring means urging said bushing radially inwardly, whereby when the tool shank is inserted into the collet, if the flat side is not aligned with the bushing, the bushing is forced radially outwardly into the hole, and when the tool is rotated to align the flat side with the bushing, the resilient means urges the bushing radially inwardly against the flat side.
Claim 4
Dependent Claim
44 words
A chuck as claimed in claim 1 in which said collet further has a key slot in the outer peripheral surface thereof, and said chuck body has a means engagable in said slot for preventing rotation of said collet relative to said chuck body.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |