Patent US3791459A successfully refreshed from Google Patents.
US3791459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor reversing control for fluid operated tool
Assignee: Gardner Denver Inc
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Filing: 1972-09-05
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Granted: 1974-02-12
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Expires: 1992-09-05
Abstract
Abstract An automatic reversing control for fluid operated rotary tools which is responsive to a fluid pressure increase in a motor inlet passage to cause a reversal of the direction of motor rotation. A shiftable spool valve is biased to reverse the motor by pressure fluid acting on the valve spool. A spring biased check valve is operable to valve biasing fluid to actuate the spool valve in response to sensing a predetermined fluid pressure in the motor inlet passage. An operator actuated start valve is disposed between the reversing valve and the motor to initiate and control the operating cycle of the tool.
Inventors
- 👤 W Workman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:17
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/145
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
163 words
A fluid actuated tool including: a housing containing a reversible fluid motor, a fluid inlet passage, first passage means for conducting pressure fluid to operate said motor in one direction, and second passage means for conducting pressure fluid to operate said motor in the opposite direction; a fluid actuated reversing valve including valve operating means and a reversing valve member movable between a first position in which said inlet passage is connected to said first passage means and a second position in which said inlet passage is connected to said second passage means; pressure sensing valve means operable to move from a closed to an open condition in response to a predetermined fluid pressure in said tool for conducting pressure fluid to said valve operating means to move said reversing valve member to said second position; and, means for biasing said valve means in said closed condition and for adjusting the predetermined pressure at which said valve means moves to said open condition.
Claim 2
Dependent Claim
163 words
A fluid actuated tool including: a housing containing a reversible fluid motor, a fluid inlet passage, first passage means for conducting pressure fluid to operate said motor in one direction, and second passage means for conducting pressure fluid to operate said motor in the opposite direction; a fluid actuated reversing valve including valve operating means and a reversing valve member movable between a first position in which said inlet passage is connected to said first passage means and a second position in which said inlet passage is connected to said second passage means; pressure sensing valve means operable to move from a closed to an open condition in response to a predetermined fluid pressure in said tool for conducting pressure fluid to said valve operating means to move said reversing valve member to said second position; and, means for biasing said valve means in said closed condition and for adjusting the predetermined pressure at which said valve means moves to said open condition.
Claim 3
Dependent Claim
90 words
The invention set forth in claim 1 wherein: said valve means comprises a check valve interposed in a passage interconnecting said first passage means and said valve operating means, and said means for biasing said valve means in a closed condition comprises a spring including means for adjusting the biasing force of said spring to be yieldable to provide for said check valve to open in response to a predetermined pressure in said first passage means for conducting pressure fluid from said first passage means to said valve operating means.
Claim 4
Dependent Claim
59 words
The invention set forth in claim 1 wherein: said housing includes an exhaust passage in communication with said reversing valve for conducting motor exhaust fluid from said second passage means when said reversing valve is in said first position and for conducting motor exhaust fluid from said first passage means when said reversing valve is in said second position.
Claim 5
Dependent Claim
74 words
The invention set forth in claim 1 wherein: said reversing valve includes means for biasing said reversing valve member in said first position, and said valve operating means comprises a pressure surface on said reversing valve member and a chamber formed in said housing, said pressure surface being responsive to the admission of pressure fluid to said chamber from said pressure sensing valve means to move said reversing valve member toward said second position.
Claim 6
Dependent Claim
74 words
The invention set forth in claim 4 wherein: said reversing valve includes a passage opening from said inlet passage to said chamber, and closure means disposed to close said passage when said reversing valve member is in said first position and to open said passage to provide for the admission of pressure fluid from said inlet passage to said chamber in response to the movement of said reversing valve member toward said second position.
Claim 7
Dependent Claim
66 words
The invention set forth in claim 5 together with: a start valve movable between actuated and released positions and disposed to block the flow of pressure fluid through said first passage means in said released position and to provide for flow of pressure fluid through said first passage means in said actuated position, said start valve including means for venting said chamber in said released position.
Claim 8
Dependent Claim
68 words
The invention set forth in claim 6 wherein: said start valve includes a portion disposed in a passage between said pressure sensing valve means and said chamber for connecting said passage to orifice means in said tool to vent pressure fluid from said chamber at a rate greater than can be supplied to said chamber from said inlet passage when said start valve is in said released position.
Claim 9
Dependent Claim
69 words
The invention set forth in claim 5 wherein: said reversing valve member comprises a valve spool disposed in a bore in said housing for reciprocable movement between said first and second positions, said pressure surface comprises a transverse end face on said spool and said means for biasing said reversing valve member in said first position comprises an opposed transverse end face on said spool facing said inlet passage.
Claim 10
Dependent Claim
62 words
The invention set forth in claim 8 wherein: said passage opening from said inlet passage to said chamber comprises a longitudinal passage disposed in said valve spool, and said closure means comprises a closure element disposed in said chamber and engageable with one end of said longitudinal passage to close said longitudinal passage when said valve spool is in said first position.
References Cited (Backward Citations)
US3491837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |