US3762732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clamping device or chuck
Assignee: STANDARD PNEUMATIC MOTOR CO
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Filing: 1972-02-25
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Granted: 1973-10-02
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Expires: 1992-02-25
Abstract
Abstract A clamping device for easily and quickly releasing or firmly securing a rotary cutting or grinding tool such as a burr, bit, or the like to a rotatable drive shaft having a longitudinallyextending, tool-shaft-receiving bore at its outer free end for reception of the shaft of rotary cutting tools such as burrs, bits, and the like. A cylindrically-shaped insert of resilient material (e.g. rubber) is disposed axially relative to the drive shaft and in a counter-bore at the free end of said drive shaft, said insert having an axial bore therethrough of approximately the same diameter as the outside diameter of the shaft of the cutting tool, so that the cutting tool shaft can be slipped into and out of the insert bore and the bore of the drive shaft. A plurality of steel balls are disposed in radial bores in the wall of the counter bore of the drive shaft, and there is cam means slideable on the drive shaft for forcing the balls into the insert to thereby compress parts of the insert onto the shaft of the cutting tool and to thereby effect operable clamping of the cutting tool shaft in the clamping device. Sliding the cam means in one direction effects clamping of the cutting or grinding tool shaft in the device, and sliding such cam means in the opposite direction effects release of said cutting or grinding tool shaft so that said cutting tool may be readily removed from the clamp device. As used herein, the term rotary cutting tool or tools includes various cutting tools such as, for example, bits, burrs, rotary grinding tools and the like.
Inventors
- 👤 R Speed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/117; B23B31/1175; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17761; Y10T279/17811; Y10T279/17957; Y10T279/35
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
297 words
A clamping device for operably holding rotatable tools, comprising: a drive shaft adapted to have one end connected to a source of power and having its other end free, said drive shaft having a free end portion with a tool shaft bore extending axially from its free end for operable reception of the shaft of a rotatable tool, said bore having an enlarged insert housing bore adjacent the free end of said drive shaft, there being at least one radial bore extending from the surface of the shaft into the enlarged insert housing bore; a resilient cylindrical insert in said insert housing bore, said insert having an axial bore therethrough of substantially the same diameter as the tool shaft bore and axially aligned therewith; means for retaining said insert in said insert housing bore; a ball of hard material in said radial bore, the diameter of said ball being greater than the thickness of the wall of the drive shaft defining the circumference of the insert housing bore so that a portion of said ball extends outwardly of the outer surface of the drive shaft when in the release position; and a sleeve slideable longitudinally on the drive shaft, said sleeve having a bore part with an internal diameter of sufficient size to snugly receive the drive shaft but to be freely slideable thereon and with another part having a bore, the internal diameter of which is greater than the outside diameter of the drive shaft, there being a cam surface between the sleeve bores and, with the sleeve in one position, the ball is in its usual release position, sliding the sleeve to another position, causing the cam surface to engage the ball and force it inwardly to pass inwardly on a portion of the insert.
Claim 2
Dependent Claim
297 words
A clamping device for operably holding rotatable tools, comprising: a drive shaft adapted to have one end connected to a source of power and having its other end free, said drive shaft having a free end portion with a tool shaft bore extending axially from its free end for operable reception of the shaft of a rotatable tool, said bore having an enlarged insert housing bore adjacent the free end of said drive shaft, there being at least one radial bore extending from the surface of the shaft into the enlarged insert housing bore; a resilient cylindrical insert in said insert housing bore, said insert having an axial bore therethrough of substantially the same diameter as the tool shaft bore and axially aligned therewith; means for retaining said insert in said insert housing bore; a ball of hard material in said radial bore, the diameter of said ball being greater than the thickness of the wall of the drive shaft defining the circumference of the insert housing bore so that a portion of said ball extends outwardly of the outer surface of the drive shaft when in the release position; and a sleeve slideable longitudinally on the drive shaft, said sleeve having a bore part with an internal diameter of sufficient size to snugly receive the drive shaft but to be freely slideable thereon and with another part having a bore, the internal diameter of which is greater than the outside diameter of the drive shaft, there being a cam surface between the sleeve bores and, with the sleeve in one position, the ball is in its usual release position, sliding the sleeve to another position, causing the cam surface to engage the ball and force it inwardly to pass inwardly on a portion of the insert.
Claim 3
Dependent Claim
37 words
The invention defined by claim 1, wherein there is a bore through the means for retaining the insert in the insert bore, the bore through said means being substantially the same diameter as the tool shaft bore.
Claim 4
Dependent Claim
59 words
The invention defined by claim 2, wherein the means for retaining the insert in its housing bore comprises a nut threadably connected to the drive shaft, and the bore through said nut is axially aligned with the bore in the insert and the bore in the drive shaft, into which bores the cutting tool is adapted to be inserted.
Claim 5
Dependent Claim
31 words
The invention defined by claim 2, wherein there are a plurality of radial bores annularly and equally spaced apart and a plurality of balls operably disposed in the respective radial bores.
Claim 6
Dependent Claim
37 words
The invention defined by claim 3, wherein the inner end of the nut has a part for retaining the insert in position and for adjustably varying the lengTh of the cavity in which the resilient insert reposes.
Claim 7
Dependent Claim
69 words
The invention defined by claim 4, including stop means for limiting longitudinal movements of the sleeve whereby, when the sleeve is at one limit of movement, the balls are in the larger diameter part of the sleeve and, when said sleeve is at the opposite limit of movement, the balls are held entirely within the radial bores to effect clamping of a rotatable tool shaft in the axially-aligned bores.
Claim 8
Dependent Claim
21 words
The invention defined by claim 6, wherein there is an outwardly-flared space from the tool shaft bore to the insert-housing bore.
Claim 9
Dependent Claim
15 words
The invention defined by claim 6, wherein the cam in the sleeve is inclined outwardly.
Claim 10
Dependent Claim
13 words
The invention defined by claim 6, wherein the sleeve cam is inclined inwardly.
Claim 11
Dependent Claim
33 words
The invention defined by claim 9, including an annular stop on the drive shaft adjacent the inner end of the sleeve for engagement by the sleeve when moved to its inward clamping position.
Claim 12
Dependent Claim
134 words
The invention defined by claim 3, wherein there are a plurality of radial bores into the insert-housing bore, said radial bores being equally spaced apart; a spherical ball in each of said radial bores, a part of said nut at its inner end retaining the insert and adapted to enter the inserthousing bore to control and limit said insert''s axial expansion under compression; and stop means limiting sliding movement of the sleeve in either direction, the balls being disposed in the larger diameter part of said sleeve when said sleeve is in the release position at one limit of movement, said balls being forced inwardly within their respective radial bores when the sleeve is moved to the opposite, secured-limit position, there being an outwardly-flaring space between the tool shaft bore and the insert-housing bore.
Claim 13
Dependent Claim
195 words
A clamping device for operably holding rotatable tools, comprising: a drive shaft adapted to have one end connected to a source of power and having its other end free, said drive shaft having a free end portion with a tool shaft bore extending axially from its free end for operable reception of the shaft of a rotatable tool, said bore having an enlarged, insert-housing bore adjacent the free end of said drive shaft, there being a plurality of radial bores intersecting the enlarged, insert-housing bore approximately at its longitudinal center; means for retaining the insert in said insert-housing bore, said means having an axial bore therethrough of substantially the same diameter as the tool-shaft bore; a resilient, cylindrical insert of rubber in said insert-housing bore, said insert having an axial bore therethrough aligned with the tool-shaft bore and the bore through the means for retaining the insert in its bore; balls in the respective radial bores, said balls extending outwardly of the drive shaft when in a release position; and means for forcing said balls inwardly for exerting pressure on said insert to compress same against a rotatable tool shaft disposed in said insert bore.
Claim 14
Dependent Claim
195 words
A clamping device for operably holding rotatable tools, comprising: a drive shaft adapted to have one end connected to a source of power and having its other end free, said drive shaft having a free end portion with a tool shaft bore extending axially from its free end for operable reception of the shaft of a rotatable tool, said bore having an enlarged, insert-housing bore adjacent the free end of said drive shaft, there being a plurality of radial bores intersecting the enlarged, insert-housing bore approximately at its longitudinal center; means for retaining the insert in said insert-housing bore, said means having an axial bore therethrough of substantially the same diameter as the tool-shaft bore; a resilient, cylindrical insert of rubber in said insert-housing bore, said insert having an axial bore therethrough aligned with the tool-shaft bore and the bore through the means for retaining the insert in its bore; balls in the respective radial bores, said balls extending outwardly of the drive shaft when in a release position; and means for forcing said balls inwardly for exerting pressure on said insert to compress same against a rotatable tool shaft disposed in said insert bore.
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 |