US3767332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control and cut-off device
Assignee: Black and Decker Corp
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Filing: 1971-08-16
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Granted: 1973-10-23
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Expires: 1991-08-16
Abstract
Abstract A powered rotary grinder including a vane-type fluid motor having a rotor supported within a housing. Pressurized fluid is admitted to the motor through a control valve to drive the rotor. A pivoted lever is engageable with the control valve and is actuated by flyweights attached to the rotor to regulate the speed of the rotor. The control valve includes normally latched, stored energy means which, when released, slams the control valve completely shut to cut off flow of pressurized fluid to the motor. A centrifugally actuated weight or weights interconnected with the rotor are operable to release the latched stored energy means should the rotor overspeed and the regulator fail to operate. In one embodiment, the weights include interengaged means which require that all the weights move radially outwardly of the rotor conjointly to effect release of the latched, stored energy means. This interengaged means insures that only centrifugal force can move the weights and that they cannot accidentally or unintentionally move to effect release of the stored energy means in the event, for example, the grinder is dropped or is otherwise struck with a sharp blow.
Inventors
- 👤 D Huffaker
- 👤 J Wickham
- 👤 A Wordsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:35
CPC Classifications
B; B24; B24B; B24B55/00; F; F01; F01C; F01C20/00; F01C20/08; F01C20/28; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/108; Y10T137/1153
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
118 words
A rotary, fluid pressure operated device comprising a housing, a motor supported within said housing and having a rotor, passage means for delivering pressurized fluid to said motor to rotate said rotor, a valve in said passage means and movable from an open to a closed position, stored energy means associated with said valve and operable to close said valve, latch means normally isolating said stored energy means from said valve means, centrifugal means normally independent of said latch means and interconnected with said rotor, said centrifugal means being engageable with said latch means upon overspeed of said rotor, whereby to release said latch means, whereupon said stored energy means moves said valve means to said closed position.
Claim 2
Dependent Claim
118 words
A rotary, fluid pressure operated device comprising a housing, a motor supported within said housing and having a rotor, passage means for delivering pressurized fluid to said motor to rotate said rotor, a valve in said passage means and movable from an open to a closed position, stored energy means associated with said valve and operable to close said valve, latch means normally isolating said stored energy means from said valve means, centrifugal means normally independent of said latch means and interconnected with said rotor, said centrifugal means being engageable with said latch means upon overspeed of said rotor, whereby to release said latch means, whereupon said stored energy means moves said valve means to said closed position.
Claim 3
Dependent Claim
92 words
A device as defined in claim 1 wherein said latch means includes a member interconnected with said valve and turnable about an axis, said stored energy means including a compression spring bearing axially against said turnable member, said turnable member being movable from a first position restrained from said valve, to a second position free to move axially under the force of said compression spring, said centrifugal means being engageable with said turnable member upon overspeed of said rotor, whereby to turn said turnable member from said first to said second position.
Claim 4
Dependent Claim
25 words
A device as defined in claim 1 wheRein said latch means is readily reset to again isolate said stored energy means from said valve means.
Claim 5
Dependent Claim
78 words
A device as defined in claim 1 wherein said latch means includes a stationary housing, a holder turnable relative to said stationary housing and interengaged with said valve, said stored energy means acting on said holder, said centrifugal means being operatively engageable with said holder upon overspeed of said rotor, whereby to turn said holder and release it from said stationary housing, whereupon said stored energy means moves said holder and thereby said valve to said closed position.
Claim 6
Dependent Claim
35 words
A device as defined in claim 4 which includes a trigger fixed to said holder and engageable with said centrifugal means upon rotor overspeed, and resilient means engaged with said trigger resisting inadvertent movement thereof.
Claim 7
Dependent Claim
83 words
A device as defined in claim 4 wherein said stored energy means acts on said holder in an axial direction, said holder and said stationary housing include angularly spaced projections engageable when said holder is in one position, whereby to prevent axial movement of said holder, said projections adapted to misalign when said holder is turned from said one position by said centrifugal means, whereby said stored energy means moves said holder in an axial direction and said valve to said closed position.
Claim 8
Dependent Claim
173 words
A speed limiting and cut-off mechanism for a rotary, fluid pressure operated motor of the type including a vane type rotor supported within a housing, passage means in said housing and communicating a pressurized fluid source with said rotor, the improvement which comprises valve means in said passage means and controlling delivery of pressurized fluid to said motor, said valve means including inlet and outlet port means, a spool movable from a first position where said port means are communicated to a second position blocking communication of said port means, first spring means normally biasing said spool toward said first position, second spring means engagable with said spool and operable to overcome said first spring means and move said spool into said second position, means normally isolating said second spring means from said spool, centrifugal means operable with said motor and isolated from the biasing action of said second spring means and operable upon overspeed of said rotor to release said isolating means, whereby to close said valve means and stop said rotor.
Claim 9
Dependent Claim
173 words
A speed limiting and cut-off mechanism for a rotary, fluid pressure operated motor of the type including a vane type rotor supported within a housing, passage means in said housing and communicating a pressurized fluid source with said rotor, the improvement which comprises valve means in said passage means and controlling delivery of pressurized fluid to said motor, said valve means including inlet and outlet port means, a spool movable from a first position where said port means are communicated to a second position blocking communication of said port means, first spring means normally biasing said spool toward said first position, second spring means engagable with said spool and operable to overcome said first spring means and move said spool into said second position, means normally isolating said second spring means from said spool, centrifugal means operable with said motor and isolated from the biasing action of said second spring means and operable upon overspeed of said rotor to release said isolating means, whereby to close said valve means and stop said rotor.
Claim 10
Dependent Claim
21 words
A mechanism as defined in claim 7 wherein said centrifugally operated means includes a pair of weights interconnected for conjoint movement.
Claim 11
Dependent Claim
57 words
A mechanism as defined in claim 8 which includes a third spring means restraining said centrifugally operated means, said third spring means having a spring constant selected so that the force of said spring increases at a lower rate than that of the centrifugal force of said centrifugally operated means as the speed of said rotor increases.
Claim 12
Dependent Claim
209 words
A speed limiting and cut-off mechanism for a rotary, fluid pressure operated motor of the type including a rotor supported within a housing, passage means in said housing and communicating a pressurized fluid source with said motor, the improvement which comprises valve means in said passage means and controlling delivery of pressurized fluid to said motor, said valve means including inlet and outlet ports, a spool movable from a first position where said ports are communicated, through intermediate positions restricting communication between said ports, to a second position blocking communication of said ports, first relatively light spring means normally biasing said spool toward said first position, first centrifugal means rotatable with said rotor and operable to move said spool toward said second position in response to speed of said rotor, second relatively strong spring means engageable with said spool and operable to overcome said first spring means and move said spool into said second position, means normally isolating said second spring means from said spOol, second centrifugal means rotatable with said rotor and isolated from the biasing action of said second spring means, said second centrifugal means being operable to release said isolating means upon overspeed of said rotor whereby to close said valve means and stop said rotor.
Claim 13
Dependent Claim
209 words
A speed limiting and cut-off mechanism for a rotary, fluid pressure operated motor of the type including a rotor supported within a housing, passage means in said housing and communicating a pressurized fluid source with said motor, the improvement which comprises valve means in said passage means and controlling delivery of pressurized fluid to said motor, said valve means including inlet and outlet ports, a spool movable from a first position where said ports are communicated, through intermediate positions restricting communication between said ports, to a second position blocking communication of said ports, first relatively light spring means normally biasing said spool toward said first position, first centrifugal means rotatable with said rotor and operable to move said spool toward said second position in response to speed of said rotor, second relatively strong spring means engageable with said spool and operable to overcome said first spring means and move said spool into said second position, means normally isolating said second spring means from said spOol, second centrifugal means rotatable with said rotor and isolated from the biasing action of said second spring means, said second centrifugal means being operable to release said isolating means upon overspeed of said rotor whereby to close said valve means and stop said rotor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |