US3724563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collet chuck operated by throttle control for rotary power tool
Assignee: Master Power Inc
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Filing: 1971-03-08
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Granted: 1973-04-03
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Expires: 1991-03-08
Abstract
Abstract A portable rotary power tool including a housing having a vanetype pneumatic motor disposed therein. The motor is coupled to an output shaft rotatably supported within the housing. A collet is keyed within the shaft and is adapted to releaseably grip a tool bit. A throttle valve controls operation of the motor and is operated by a pivoted lever mounted on the housing. When the lever is moved in a direction opposite to that required for operation of the motor, the collet is positively released from the bit.
Inventors
- 👤 J Wickham
- 👤 L Ramstrom
- 👤 A Wordsworth
- 👤 R Meloni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:29
CPC Classifications
B; B23; B23B; B23B45/00; B23B45/04; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/20; B23B31/201; B23B31/207; B23B31/2073; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17411; Y10T279/17529
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
177 words
A portable tool including a housing having a rotary, fluidoperated motor disposed therein, throttle valve means within said housing controlling flow of pressurized fluid to said motor, lever means pivoted on said housing and movable in a first direction to open said throttle valve means, said motor including a rotor spindle rotatably supported in said housing, a shaft coupled to said rotor spindle for rotation therewith, a collet within said shaft adapted to releaseably grip a bit, the improvement which comprises cooperable cam surface means on said collet and said shaft, means normally biasing said collet in one longitudinal direction, whereby cooperation between said cam surfaces effects radial contraction of said collet about a bit, said lever being movable in a second direction opposite to said first direction and operatively engageable with said rotor spindle, whereby to shift said rotor spindle in an axial direction, means interconnecting said rotor spindle and said collet, whereby said axial movement of said rotor spindle positively moves said collet against said biasing means, whereby to release said collet from said bit.
Claim 2
Dependent Claim
177 words
A portable tool including a housing having a rotary, fluidoperated motor disposed therein, throttle valve means within said housing controlling flow of pressurized fluid to said motor, lever means pivoted on said housing and movable in a first direction to open said throttle valve means, said motor including a rotor spindle rotatably supported in said housing, a shaft coupled to said rotor spindle for rotation therewith, a collet within said shaft adapted to releaseably grip a bit, the improvement which comprises cooperable cam surface means on said collet and said shaft, means normally biasing said collet in one longitudinal direction, whereby cooperation between said cam surfaces effects radial contraction of said collet about a bit, said lever being movable in a second direction opposite to said first direction and operatively engageable with said rotor spindle, whereby to shift said rotor spindle in an axial direction, means interconnecting said rotor spindle and said collet, whereby said axial movement of said rotor spindle positively moves said collet against said biasing means, whereby to release said collet from said bit.
Claim 3
Dependent Claim
36 words
A tool as defined in claim 1 wherein said cam surface means includes conical tapered surfaces on said collet and shaft, said surface on said collet having a sharper angle than said surface on said shaft.
Claim 4
Dependent Claim
25 words
A tool as defined in claim 2 wherein said collet is longitudinally slotted at said conically tapered portion forming a plurality of radially flexible fingers.
Claim 5
Dependent Claim
42 words
A tool as defined in claim 1 wherein the force of said biasing means acts on said collet and shaft, said interconnecting means between said rotor spindle and said collet preventing said biasing means from imposing undesirable loads on said rotor spindle.
Claim 6
Dependent Claim
77 words
A tool as defined in claim 1 which includes cooperable abutment means between said shaft and said housing, said coupling between said rotor and said shaft allowing limited axial movement therebetween, whereby initial axial shifting of said rotor spindle moves said collet relative to said shaft and thereafter said rotor spindle, said shaft and said collet are moved together to engage said abutment means, said abutment means preventing further movement of said collet, shaft, and rotor spindle.
Claim 7
Dependent Claim
23 words
A tool as defined in claim 5 which includes means normally biasing said shaft in an axial direction to space said abutment means.
Claim 8
Dependent Claim
169 words
A fluid operated device comprising a housing, a motor supported within said housing and including a rotor spindle rotatably supported within said housing, a shaft rotatably supported in said housing and coupled for conjoint rotation with said rotor spindle, said shaft having a generally hollow cylindrical-shaped outer end, a collet within said shaft outer end and operable to grip a tool bit, said shaft and said collet having complimentary, engageable conical surfaces, whereby movement of said collet into said shaft causes a portion of said collet adjacent said Conical surface to be radially contracted, means independent of said shaft connecting said rotor spindle and said collet for conjoint longitudinal movement, means normally biasing said rotor spindle and said shaft in opposite axial directions whereby to bias said collet into said shaft, manually operable means engageable with said rotor spindle whereby to move said rotor spindle in an axial direction against said biasing means, whereby to move said collet out of said shaft and release said collet from said bit.
Claim 9
Dependent Claim
169 words
A fluid operated device comprising a housing, a motor supported within said housing and including a rotor spindle rotatably supported within said housing, a shaft rotatably supported in said housing and coupled for conjoint rotation with said rotor spindle, said shaft having a generally hollow cylindrical-shaped outer end, a collet within said shaft outer end and operable to grip a tool bit, said shaft and said collet having complimentary, engageable conical surfaces, whereby movement of said collet into said shaft causes a portion of said collet adjacent said Conical surface to be radially contracted, means independent of said shaft connecting said rotor spindle and said collet for conjoint longitudinal movement, means normally biasing said rotor spindle and said shaft in opposite axial directions whereby to bias said collet into said shaft, manually operable means engageable with said rotor spindle whereby to move said rotor spindle in an axial direction against said biasing means, whereby to move said collet out of said shaft and release said collet from said bit.
Claim 10
Dependent Claim
27 words
A device as defined in claim 7 wherein said interconnecting means between said rotor spindle and said collet includes an elongated member extending loosely through said shaft.
Claim 11
Dependent Claim
29 words
A device as defined in claim 7 which includes means independent of the rotatable support for said rotor spindle limiting axial movement of said rotor spindle in both directions.
Claim 12
Dependent Claim
37 words
A device as defined in claim 7 which includes first and second longitudinally spaced bearings slideably supported in said housing and engaging shoulders on said shaft and rotor spindles, respectively, said biasing means operatively engaging said bearings.
Claim 13
Dependent Claim
148 words
A portable, hand-held, pneumatic tool comprising a housing having a generally cylindrical portion which is hand gripped by an operator during normal tool use, a rotary vane-type motor in said housing, a throttle valve in said housing and controlling the flow of pressurized fluid to said motor, an operating lever pivoted on said housing adjacent said cylindrical portion and movable toward said housing by said operator''s hand during normal tool use, whereby to open said throttle valve and operate said motor, a shaft rotatably supported in said housing and driven by said motor, a collet carried by said shaft and operable to clampingly engage with a bit to couple said bit to said shaft, means operably interconnecting said collet and said lever and operable to positively release said collet from clamping engagement with said bit by pivotal movement of said operating lever away from said housing cylindrical portion.
Claim 14
Dependent Claim
148 words
A portable, hand-held, pneumatic tool comprising a housing having a generally cylindrical portion which is hand gripped by an operator during normal tool use, a rotary vane-type motor in said housing, a throttle valve in said housing and controlling the flow of pressurized fluid to said motor, an operating lever pivoted on said housing adjacent said cylindrical portion and movable toward said housing by said operator''s hand during normal tool use, whereby to open said throttle valve and operate said motor, a shaft rotatably supported in said housing and driven by said motor, a collet carried by said shaft and operable to clampingly engage with a bit to couple said bit to said shaft, means operably interconnecting said collet and said lever and operable to positively release said collet from clamping engagement with said bit by pivotal movement of said operating lever away from said housing cylindrical portion.
Claim 15
Dependent Claim
149 words
A portable, hand-held, power tool comprising a housing having a generally cylindrical portion which is hand gripped by an operator during normal tool use, a rotary motor in said housing, motor control means in said housing and controlling operation of said motor, an operating lever pivoted on said housing adjacent said cylindrical portion and movable towards said housing by said operator''s hand during normal tool use, whereby to actuate said control means and operate said motor, a shaft rotatably supported in said housing and driven by said motor, a collet carried by said shaft and engageable with a bit to couple said bit to said shaft, means normally biasing said collet into gripping engagement with said bit, means operable by said operating lever and positively moving said collet against said biasing means to release said bit by pivotal movement of said operating lever away from said housing cylindrical portion.
Claim 16
Dependent Claim
149 words
A portable, hand-held, power tool comprising a housing having a generally cylindrical portion which is hand gripped by an operator during normal tool use, a rotary motor in said housing, motor control means in said housing and controlling operation of said motor, an operating lever pivoted on said housing adjacent said cylindrical portion and movable towards said housing by said operator''s hand during normal tool use, whereby to actuate said control means and operate said motor, a shaft rotatably supported in said housing and driven by said motor, a collet carried by said shaft and engageable with a bit to couple said bit to said shaft, means normally biasing said collet into gripping engagement with said bit, means operable by said operating lever and positively moving said collet against said biasing means to release said bit by pivotal movement of said operating lever away from said housing cylindrical portion.
Claim 17
Dependent Claim
70 words
A device as defined in claim 12 wherein said rotary motor comprises a pneumatic vane-type motor, said control means comprises a throttle valve including a pin slideable on said housing, said operating lever including a projection engageable with said pin, said housing including means defining a recess surrounding said pin, whereby said pin is inaccessible for accidental manual operation when said lever is moved away from said cylindrical housing portion.
Claim 18
Dependent Claim
145 words
A portable, hand-held, power tool comprising a housing, means defining a portion which is hand gripped by an operator during normal tool use, a rotary motor in said housing, motor control means in said housing and controlling operation of said motor, an operating member movably mounted on said housing adjacent said hand gripped portion and manually movable in one direction during normal tool use, whereby to actuate said control means and operate said motor, a shaft rotatably supported in said housing and driven by said motor, a collet carried by sAid shaft and engageable with the bit to couple said bit to said shaft, means normally biasing said collet into gripping engagement with said bit, means operable by said operating member and positively moving said collet against said biasing means to release said bit by movement of said operating member in another and different direction.
Claim 19
Dependent Claim
145 words
A portable, hand-held, power tool comprising a housing, means defining a portion which is hand gripped by an operator during normal tool use, a rotary motor in said housing, motor control means in said housing and controlling operation of said motor, an operating member movably mounted on said housing adjacent said hand gripped portion and manually movable in one direction during normal tool use, whereby to actuate said control means and operate said motor, a shaft rotatably supported in said housing and driven by said motor, a collet carried by sAid shaft and engageable with the bit to couple said bit to said shaft, means normally biasing said collet into gripping engagement with said bit, means operable by said operating member and positively moving said collet against said biasing means to release said bit by movement of said operating member in another and different direction.
Claim 20
Dependent Claim
164 words
A pressure fluid operated rotary device comprising a housing having a rotary vane-type motor disposed therein, said motor including a rotor spindle supported for rotation and limited axial movement within said housing, a shaft coupled for conjoint rotation with said rotor spindle and supported for limited axial movement relative thereto, a collet in said shaft and interconnected with said rotor spindle for conjoint axial movement therewith, cooperable means on said shaft and said collet operable to hold said collet in engagement with a bit when said collet is in a first position within said shaft, resilient means normally holding said rotor spindle and shaft in one relative axial position and said collet in said one position, manually operable means operatively engageable with said rotor spindle for moving said rotor spindle axially relative to said shaft and against the action of said biasing means, whereby to move said collet in a direction away from said first position, whereby to release said collet from said bit.
Claim 21
Dependent Claim
164 words
A pressure fluid operated rotary device comprising a housing having a rotary vane-type motor disposed therein, said motor including a rotor spindle supported for rotation and limited axial movement within said housing, a shaft coupled for conjoint rotation with said rotor spindle and supported for limited axial movement relative thereto, a collet in said shaft and interconnected with said rotor spindle for conjoint axial movement therewith, cooperable means on said shaft and said collet operable to hold said collet in engagement with a bit when said collet is in a first position within said shaft, resilient means normally holding said rotor spindle and shaft in one relative axial position and said collet in said one position, manually operable means operatively engageable with said rotor spindle for moving said rotor spindle axially relative to said shaft and against the action of said biasing means, whereby to move said collet in a direction away from said first position, whereby to release said collet from said bit.
Claim 22
Dependent Claim
173 words
A portable, hand held, power tool comprising a housing, a powered rotary motor in said housing and having an output rotary spindle, a collet coupled to said spindle for conjoint rotation and axial movement therewith and having radially deflectable fingers for gripping a bit, a shaft sleeved over and keyed to said collet, cooperable cam surfaces on said shaft and said collet operable to deflect said fingers into gripping engagement with a bit when said collet is moved in one axial direction relative to said shaft, said collet fingers being radially movable out of gripping engagement with said bit when said collet is moved in another axial direction relative to said shaft, axially spaced bearing means slip fitted in said housing, and supporting and axially engaging said shaft and said rotor, resilient means biasing said bearing means axially apart and said collet in said one axial direction relative to said shaft, and manually operable means on said housing and operable to move said collet in said another axial direction relative to said shaft.
Claim 23
Dependent Claim
173 words
A portable, hand held, power tool comprising a housing, a powered rotary motor in said housing and having an output rotary spindle, a collet coupled to said spindle for conjoint rotation and axial movement therewith and having radially deflectable fingers for gripping a bit, a shaft sleeved over and keyed to said collet, cooperable cam surfaces on said shaft and said collet operable to deflect said fingers into gripping engagement with a bit when said collet is moved in one axial direction relative to said shaft, said collet fingers being radially movable out of gripping engagement with said bit when said collet is moved in another axial direction relative to said shaft, axially spaced bearing means slip fitted in said housing, and supporting and axially engaging said shaft and said rotor, resilient means biasing said bearing means axially apart and said collet in said one axial direction relative to said shaft, and manually operable means on said housing and operable to move said collet in said another axial direction relative to said shaft.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |