Patent US3924693A successfully refreshed from Google Patents.
US3924693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated tool having self-compensating throttle valve
Assignee: Stanley Works
•
Filing: 1973-07-11
•
Granted: 1975-12-09
•
Expires: 1993-07-11
Abstract
Abstract A tool housing having a fluid supply passage leading to a fluid motor, a throttle valve received for movement in the passage between an open flow control position and a closed position, and a throttle control including a positively operated throttle actuator and a spring between the throttle valve and its actuator, the spring being preloaded upon operation of the actuator for effecting movement of the throttle valve independently of its actuator for automatically controlling fluid flow in the passage.
Inventors
- 👤 Hugh L Whitehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:26
CPC Classifications
B; B23; B23B; B23B45/00; B23B45/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7905
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
407 words
In a power tool having a pneumatically operated drive motor, a control valve having a fluid inlet adapted to be connected to a pneumatic pressure source and a fluid outlet connected to the drive motor, a valve bore interconnecting the valve inlet and valve outlet providing a fluid passageway therebetween, a valve seat surrounding the bore intermediate the valve bore inlet and outlet, a valve member mounted in the bore shiftable in first and second opposite axial directions therein respectively to and from a respective closed position thereof for selectively seating on said valve seat and closing said fluid passageway and providing a variable and decreasing fluid restriction between the valve inlet and outlet as the valve member is shifted in said second opening direction from its closed position, the valve member being mounted to be biased in the first closing direction by the valve inlet pressure and in the second opening direction by the valve outlet pressure, the valve member being mounted in the bore such that the net fluid pressure force on the valve member is in said first closing direction and is a function of the pressure drop from the valve inlet to the valve outlet and therefore the fluid restriction therebetween, first spring means biasing the valve member in said closing direction and manually operated valve control means for selectively shifting the valve in said opening direction for controlling the pneumatic operation of the drive motor, the improvement wherein the manually operated valve control means comprises second spring means biasing the valve member in the opening direction and manual actuator means for manually actuating the valve member in said opening direction from its closed position, said manual actuator means closing the bore at an end thereof and continuously sealing the bore from atmosphere, said second spring means being mounted between said valve member and said manual actuator means, said manual actuator means manually selectively varying the opening spring bias on the valve member in excess of the opposing closing spring bias on the valve member such that the open axial position of the valve member is dependent on the relative opening and closing spring bias on the valve member and on the pressure drop and thErefore the fluid restriction between the valve inlet and valve outlet and the valve member automatically compensates for drive motor speed and therefore drive motor load for varying the valve opening in accordance with the drive motor load.
Claim 2
Dependent Claim
407 words
In a power tool having a pneumatically operated drive motor, a control valve having a fluid inlet adapted to be connected to a pneumatic pressure source and a fluid outlet connected to the drive motor, a valve bore interconnecting the valve inlet and valve outlet providing a fluid passageway therebetween, a valve seat surrounding the bore intermediate the valve bore inlet and outlet, a valve member mounted in the bore shiftable in first and second opposite axial directions therein respectively to and from a respective closed position thereof for selectively seating on said valve seat and closing said fluid passageway and providing a variable and decreasing fluid restriction between the valve inlet and outlet as the valve member is shifted in said second opening direction from its closed position, the valve member being mounted to be biased in the first closing direction by the valve inlet pressure and in the second opening direction by the valve outlet pressure, the valve member being mounted in the bore such that the net fluid pressure force on the valve member is in said first closing direction and is a function of the pressure drop from the valve inlet to the valve outlet and therefore the fluid restriction therebetween, first spring means biasing the valve member in said closing direction and manually operated valve control means for selectively shifting the valve in said opening direction for controlling the pneumatic operation of the drive motor, the improvement wherein the manually operated valve control means comprises second spring means biasing the valve member in the opening direction and manual actuator means for manually actuating the valve member in said opening direction from its closed position, said manual actuator means closing the bore at an end thereof and continuously sealing the bore from atmosphere, said second spring means being mounted between said valve member and said manual actuator means, said manual actuator means manually selectively varying the opening spring bias on the valve member in excess of the opposing closing spring bias on the valve member such that the open axial position of the valve member is dependent on the relative opening and closing spring bias on the valve member and on the pressure drop and thErefore the fluid restriction between the valve inlet and valve outlet and the valve member automatically compensates for drive motor speed and therefore drive motor load for varying the valve opening in accordance with the drive motor load.
Claim 3
Dependent Claim
16 words
A power tool according to claim 1 wherein the second spring means is a compression spring.
Claim 4
Dependent Claim
78 words
A power tool according to claim 1 wherein the manual actuator means is selectively operable from a first position to a second position for engaging and initially shifting the valve member in said opening direction from its closed position, and wherein the second spring means, with the actuator means in its second position, has sufficient bias to shift the valve member further in said opening direction so that the valve member thereupon automatically compensates for drive motor speed.
References Cited (Backward Citations)
US1623431A
Cited
US1681044A
Cited
US2661765A
Cited
US2740507A
Cited
US3086501A
Cited
US3037740A
Cited
US3373824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |