US3584694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque delivery signal control mechanism for a two-speed nut-running tool
Assignee: Chicago Pneumatic Tool Co LLC
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Filing: 1969-11-05
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Granted: 1971-06-15
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Expires: 1989-11-05
Abstract
Abstract A nut-running tool having an initial rundown phase and a final torquing phase, accomplished by means of a main rundown air motor and an auxiliary torquing air motor, both operating concurrently in the same direction. The rundown motor operates through a small gear reduction connection in a planetary gear system to drive a common output spindle connected with the work; and the torquing motor acts through a larger gear reduction connection in the planetary gearing to drive the spindle. The rundown motor stalls on the gearing upon reaching the limits of its capacity, permitting continued torque delivery by the torquing motor until the holding capacity of the rundown motor on the gearing is reached. Thereafter, further torque delivery of the torquing motor acts through the gearing to rotate the rundown motor backwards. At about the time the main motor starts to rotate backwards, a final torque value is delivered by the auxiliary motor, after which the work does not experience further torque increase. The directional change of rotation is used to cause actuation of control mechanism which is operable to signal a circuit to terminate operation of the tool after delivery of final torque has occurred.
Inventors
- 👤 William K Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:53
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/145; B25B23/1456
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
150 words
In a rotary tool including a reversible rotary shaft, a pressure-operable signal device, an air-pressure chamber, and actuable means adapted upon building up of air pressure within the chamber to cause operation of the signal device, the pressure chamber having an inlet connectable to a source of pressure air and having a vent for preventing buildup of inlet air pressure within the chamber when the vent is in open condition; a valve positionable to allow escape of pressure air from the chamber through the vent while the shaft is rotating in a forward direction, and slip-clutch cam means rotatable with the shaft when the shaft is rotated in a reverse direction to cam the valve closed over the vent, the slip-clutch cam means being adapted to slip relative to the shaft upon camming the valve closed so as to allow relative continued rotation of the shaft in the reverse direction.
Claim 2
Dependent Claim
150 words
In a rotary tool including a reversible rotary shaft, a pressure-operable signal device, an air-pressure chamber, and actuable means adapted upon building up of air pressure within the chamber to cause operation of the signal device, the pressure chamber having an inlet connectable to a source of pressure air and having a vent for preventing buildup of inlet air pressure within the chamber when the vent is in open condition; a valve positionable to allow escape of pressure air from the chamber through the vent while the shaft is rotating in a forward direction, and slip-clutch cam means rotatable with the shaft when the shaft is rotated in a reverse direction to cam the valve closed over the vent, the slip-clutch cam means being adapted to slip relative to the shaft upon camming the valve closed so as to allow relative continued rotation of the shaft in the reverse direction.
Claim 3
Dependent Claim
16 words
In a rotary tool as in claim 1, wherein the actuable means is a spring-returnable plunger.
Claim 4
Dependent Claim
19 words
In a rotary tool as in claim 1, wherein the inlet is of restricted diameter relative to the vent.
Claim 5
Dependent Claim
46 words
In a rotary tool as in claim 1, wherein the slip-clutch cam means is responsive to a change of rotation of the shaft from a reverse direction to said forward direction to rotate with the shaft so as to release the valve from its closed condition.
Claim 6
Dependent Claim
72 words
In a rotary tool as in claim 4, wherein stop means projects into the path of rotation of the slip-clutch cam means so as to stop rotation thereof in said forward direction after the slip-clutch cam means has traveled a predetermined angular distance, the slip-clutch cam means being adapted to slip relative to the shaft when so stopped so as to allow relative continued rotation of the shaft in said forward direction.
Claim 7
Dependent Claim
211 words
In a nut-running tool including a reversible rotary shaft, a pressure-operable signal device, an air-pressure chamber, and actuating means adapted upon building up of a predetermined air pressure within the chamber to cause operation of the signal device, the pressure chamber having an inlet connectable to a source of pressure air and having a vent for preventing buildup of inlet air pressure within the chamber when the vent is in open condition, a valve seat at the exit end of the vent, a ball valve having a loose relation to the seat while the shaft is rotating in a forward direction so as to allow venting of pressure air from the chamber; cam means for pressing the ball valve closed upon the seat when the shaft is caused to rotate in a reverse direction, slip-clutch means frictionally engaging the shaft with the cam means for rotation of the cam means with the shaft, the slip-clutch means adapted upon a predetermined resistance being offered to rotation of the cam means to allow rotative slippage of the shaft relative to the cam means, the ball valve adapted upon being pressed closed upon the seat by the cam means to resist further rotation Of the cam means by the shaft in said reverse direction.
Claim 8
Dependent Claim
211 words
In a nut-running tool including a reversible rotary shaft, a pressure-operable signal device, an air-pressure chamber, and actuating means adapted upon building up of a predetermined air pressure within the chamber to cause operation of the signal device, the pressure chamber having an inlet connectable to a source of pressure air and having a vent for preventing buildup of inlet air pressure within the chamber when the vent is in open condition, a valve seat at the exit end of the vent, a ball valve having a loose relation to the seat while the shaft is rotating in a forward direction so as to allow venting of pressure air from the chamber; cam means for pressing the ball valve closed upon the seat when the shaft is caused to rotate in a reverse direction, slip-clutch means frictionally engaging the shaft with the cam means for rotation of the cam means with the shaft, the slip-clutch means adapted upon a predetermined resistance being offered to rotation of the cam means to allow rotative slippage of the shaft relative to the cam means, the ball valve adapted upon being pressed closed upon the seat by the cam means to resist further rotation Of the cam means by the shaft in said reverse direction.
Claim 9
Dependent Claim
94 words
In a nut-running tool as in claim 6, wherein the slip-clutch means is responsive to a change of rotation of the shaft from a reverse direction to a forward direction so as to cause the shaft to carry the cam means angularly out of said pressed relation to the ball valve, an ear projects from the cam means, and a stop having cooperation with the ear following a predetermined angular movement of the cam means with the shaft resists further angular movement of the cam means with the shaft in the said forward direction.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |