US3654836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid motor control system
Assignee: Caterpillar Inc
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Filing: 1970-06-03
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Granted: 1972-04-11
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Expires: 1990-06-03
Abstract
Abstract An operator''s actuator lever provides for starting, stopping and speed control of a fluid motor and a separate direction lever provides for selecting forward or reverse motor operation. The two levers are supported for pivoting motion along arcs which extend at right angles to each other and a stop carried on the actuator lever blocks shifting of the directional lever except when the motor is stopped thereby avoiding damage to mechanism driven by the motor from sudden reversal at high speeds. Through fluid lines, the levers condition a compact simplified valve assembly which directs driving fluid to a selected side of the motor at a selected rate and which also functions as a make-up valve to avoid cavitation and as a lock valve to resist motor movement by external load forces acting on the mechanism connected to the motor.
Inventors
- 👤 Lawrence F Schexnayder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:46
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0405; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87201
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
353 words
In a control system for a motor which is driven by pressurized fluid received through an actuator valve having open and closed positions, said motor having a pair of fluid ports wherein fluid may be directed to a forward drive one of said ports to produce motor operation in a forward direction and to a reverse drive one of said ports to produce motor operation in a reverse direction and wherein fluid directed to one of said ports is transmitted to drain means through the other port during motor operation, the combination comprising: valve body means having a fluid inlet receiving fluid from said actuator valve and having a forward drive passage for transmitting fluid from said inlet to said forward drive Port of said motor, said valve body further having a reverse drive passage for transmitting fluid from said inlet to said reverse drive port of said motor, a first pair of valve members each being situated in a separate one of said passages of said valve body means and each having an open position and a closed position, a second pair of valve members each being situated between a separate one of said passages of said valve body means and said drain means and each having an open position and a closed position, a motor direction control valve having an inlet communicated with said actuator valve for receiving a portion of said pressurized fluid therefrom and having a forward drive position at which said fluid is transmitted to the one of said first pair of valve members that is situated in said forward drive passage and the one of said second pair of valve members that is situated in said reverse drive passage to hold said ones of said valve members in the closed positions thereof, said motor direction control valve having a reverse drive position at which said fluid is directed to the others of said first and second valve members to hold said other valve members closed, and means for blocking a shift of said motor direction control valve between said positions thereof while said actuator valve is opened.
Claim 2
Dependent Claim
353 words
In a control system for a motor which is driven by pressurized fluid received through an actuator valve having open and closed positions, said motor having a pair of fluid ports wherein fluid may be directed to a forward drive one of said ports to produce motor operation in a forward direction and to a reverse drive one of said ports to produce motor operation in a reverse direction and wherein fluid directed to one of said ports is transmitted to drain means through the other port during motor operation, the combination comprising: valve body means having a fluid inlet receiving fluid from said actuator valve and having a forward drive passage for transmitting fluid from said inlet to said forward drive Port of said motor, said valve body further having a reverse drive passage for transmitting fluid from said inlet to said reverse drive port of said motor, a first pair of valve members each being situated in a separate one of said passages of said valve body means and each having an open position and a closed position, a second pair of valve members each being situated between a separate one of said passages of said valve body means and said drain means and each having an open position and a closed position, a motor direction control valve having an inlet communicated with said actuator valve for receiving a portion of said pressurized fluid therefrom and having a forward drive position at which said fluid is transmitted to the one of said first pair of valve members that is situated in said forward drive passage and the one of said second pair of valve members that is situated in said reverse drive passage to hold said ones of said valve members in the closed positions thereof, said motor direction control valve having a reverse drive position at which said fluid is directed to the others of said first and second valve members to hold said other valve members closed, and means for blocking a shift of said motor direction control valve between said positions thereof while said actuator valve is opened.
Claim 3
Dependent Claim
408 words
In a control system for a motor which is driven by pressurized fluid received through an actuator valve having open and closed positions, said motor having a pair of fluid ports wherein fluid may be directed to a forward drive one of said ports to produce motor operation in a forward direction and to a reverse drive one of said ports to produce motor operation in a reverse direction and wherein fluid directed to one of said ports is transmitted to drain means through the other port during motor operation, the combination comprising: valve body means having a fluid inlet receiving fluid from said actuator valve and having a forward drive passage for transmitting fluid from said inlet to said forward drive port of said motor, said valve body further having a reverse drive passage for transmitting fluid from said inlet to said reverse drive port of said motor, a first pair of valve members each being situated in a separate one of said passages of said valve body means and each having an open position and a closed position, a second pair of valve members each being situated between a separate one of said passages of said valve body means and said drain means and each having an open position and a closed position, a motor direction control valve having an inlet communicated with said actuator valve for receiving a portion of said pressurized fluid therefrom and having a forward drive position at which said fluid is transmitted to the one of said first pair of valve members that is situated in said forward drive passage and the one of said second pair of valve members that is situated in said reverse drive passage to hold said ones of said valve members in the closed positions thereof, said motor direction control valve having a reverse drive position at which said fluid is directed to the others of said first and second valve members to hold said other valve members closed, an actuator lever coupled to said actuator valve and movable to shift and actuator valve between said open and closed positions thereof, and a direction selector lever movable between forward and reverse positions for shifting said motor direction control valve between said forward and reverse positions thereof, and means coupled to said actuator lever and movable therewith for blocking said movement of said direction selector lever when said actuator lever is positioned to open said actuator valve.
Claim 4
Dependent Claim
408 words
In a control system for a motor which is driven by pressurized fluid received through an actuator valve having open and closed positions, said motor having a pair of fluid ports wherein fluid may be directed to a forward drive one of said ports to produce motor operation in a forward direction and to a reverse drive one of said ports to produce motor operation in a reverse direction and wherein fluid directed to one of said ports is transmitted to drain means through the other port during motor operation, the combination comprising: valve body means having a fluid inlet receiving fluid from said actuator valve and having a forward drive passage for transmitting fluid from said inlet to said forward drive port of said motor, said valve body further having a reverse drive passage for transmitting fluid from said inlet to said reverse drive port of said motor, a first pair of valve members each being situated in a separate one of said passages of said valve body means and each having an open position and a closed position, a second pair of valve members each being situated between a separate one of said passages of said valve body means and said drain means and each having an open position and a closed position, a motor direction control valve having an inlet communicated with said actuator valve for receiving a portion of said pressurized fluid therefrom and having a forward drive position at which said fluid is transmitted to the one of said first pair of valve members that is situated in said forward drive passage and the one of said second pair of valve members that is situated in said reverse drive passage to hold said ones of said valve members in the closed positions thereof, said motor direction control valve having a reverse drive position at which said fluid is directed to the others of said first and second valve members to hold said other valve members closed, an actuator lever coupled to said actuator valve and movable to shift and actuator valve between said open and closed positions thereof, and a direction selector lever movable between forward and reverse positions for shifting said motor direction control valve between said forward and reverse positions thereof, and means coupled to said actuator lever and movable therewith for blocking said movement of said direction selector lever when said actuator lever is positioned to open said actuator valve.
Claim 5
Dependent Claim
121 words
The combination defined in claim 2 wherein said actuator lever is pivoted for motion within a first plane and said direction selector lever is pivoted for motion within a plane normal to said first plane, further comprising a cam coupled to said direction selector leVer to turn about the pivot axis thereof when said direction selector lever is moved, and wherein said means for blocking movement of said direction selector lever when said actuator lever is positioned to open said actuator valve comprises a member secured to said actuator lever and extending therefrom in position to be abutted by said cam upon attempted pivoting of said direction selector lever while said actuator lever is positioned to hold said actuator valve open.
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |