US3727928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collet chuck
Assignee: Kennametal Inc
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Filing: 1970-10-02
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Granted: 1973-04-17
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Expires: 1990-10-02
Abstract
Abstract A collet chuck of the type wherein a nosepiece having screwthreaded engagement with the chuck body forces a contractible collet axially inwardly of the body to effect contraction of the collet through a nose ring interposed between the axially outer end of the collet and an inturned shoulder on the nosepiece, the collet chuck herein being characterized in that the nose ring has a close axially telescoping fit with the axially outer end portion of the collet and a radial clearance fit within the nosepiece so that the nose ring and collet remain coaxial during operation of the chuck so as to accurately grip a tool or the like with its axis substantially coinciding with the axis of the chuck body.
Inventors
- 👤 M Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:36
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/20; B23B31/208; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17411; Y10T279/17487; Y10T279/17495; Y10T279/17521; Y10T279/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
A chuck comprising a chuck body having a tapered bore; a collet contractible upon axial inward movement against said bore; a nosepiece having threaded engagement with said body; and a nose ring between said collet and said nosepiece; said nosepiece, nose ring, and collet having interengageable radially overlapped faces which overlap only in an axial direction thus to move said collet axially inwardly against said bore in response to tightening of said nosepiece and rotation thereof with respect to said nose ring; said nose ring having a cylindrical bore which is a close axially telescoping fit with the outside diameter of the axially outer end portion of said collet and having an outside diameter which is a radial clearance fit in the threaded bore of said nosepiece, whereby said nose ring is retained by said collet in coaxial position relative to said collet and said tapered bore during tightening of said nosepiece despite eccentricity of the face of said nosepiece which radially overlaps and engages the face of said nose ring.
Claim 2
Dependent Claim
171 words
A chuck comprising a chuck body having a tapered bore; a collet contractible upon axial inward movement against said bore; a nosepiece having threaded engagement with said body; and a nose ring between said collet and said nosepiece; said nosepiece, nose ring, and collet having interengageable radially overlapped faces which overlap only in an axial direction thus to move said collet axially inwardly against said bore in response to tightening of said nosepiece and rotation thereof with respect to said nose ring; said nose ring having a cylindrical bore which is a close axially telescoping fit with the outside diameter of the axially outer end portion of said collet and having an outside diameter which is a radial clearance fit in the threaded bore of said nosepiece, whereby said nose ring is retained by said collet in coaxial position relative to said collet and said tapered bore during tightening of said nosepiece despite eccentricity of the face of said nosepiece which radially overlaps and engages the face of said nose ring.
Claim 3
Dependent Claim
90 words
The chuck of claim 1 wherein said tapered bore comprises axially spaced apart frusto-conical surfaces which have vertices of equal angle and wherein said collet has corresponding axially spaced apart tapered surfaces engageable with the respective frusto-conical surfaces of said chuck body whereby, when said collet is moved axially inwardly of said body by tightening of said nosepiece, said collet is radially contracted to grip a tool shank or the like at axially spaced apart regions to stably support said collet within said tapered bore against tilting or lateral displacement.
Claim 4
Dependent Claim
39 words
The chuck of claim 1 wherein the radially overlapped faces of said nose ring and collet are beveled to effect radial contraction of said collet at the axially outer end portion thereof in response to tightening of said nosepiece.
Claim 5
Dependent Claim
55 words
The chuck of claim 1 wherein the radially overlapped faces of said nosepiece and said nose ring are beveled to enable slight tilting of said nosepiece with respect to said nose ring due to thread eccentricities or misalignment without imposition of substantial lateral forces on said nose ring and collet during tightening of said nosepiece.
Claim 6
Dependent Claim
25 words
The chuck of claim 1 wherein a split wire ring in a thread groove of said nosepiece axially retains said nose ring in said nosepiece.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |