US4147219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-speed offset nutrunner
Assignee: Chicago Pneumatic Tool Co LLC
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Filing: 1977-11-21
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Granted: 1979-04-03
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Expires: 1997-11-21
Abstract
Abstract A two-speed pneumatically powered rotary nut runner having an auxiliary motor, and a main motor axially offset from the auxiliary motor and being drivingly connected thereto by a reduction gear cage. An output spindle is provided for engagement with a drive shank for setting of a threaded fastener, and an intermediate spindle, drivingly connected to the auxiliary motor, is coupled to the output spindle by planetary gears. A torque signal assembly is operatively associated with the main motor and is operative upon reverse rotation of the main motor to generate a pneumatic signal indicative of such reverse rotation. Reverse rotation of the main motor is caused by the auxiliary motor when it has exerted predetermined final torque upon the threaded fastener. The fact that the main motor is axially offset from the auxiliary motor, allows the rotor of the main motor to be of smaller diameter. This, coupled with reduced speed of rotation of the reduction gear cage by reason of a spur gear coupling with the main motor output shaft, provides a reduction in kinetic energy at lower torque values without errors in torque readings because of stored energy in the rotating parts.
Inventors
- 👤 William K. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:03
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/145; B25B23/1456
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A two-speed pneumatically powered rotary nut runner including an output spindle adapted for rotation of a drive shank engageable with a threaded fastener, an auxiliary motor, a main motor axially offset from the auxiliary motor and being drivingly connected thereto by a rotatable reduction gear cage the rotational speed of the cage being less than that of the main motor, an intermediate spindle drivingly connected to the auxiliary motor, and a forward gear cage enclosing planetary gearing interconnecting the intermediate spindle to the output spindle.
Claim 2
Dependent Claim
85 words
A two-speed pneumatically powered rotary nut runner including an output spindle adapted for rotation of a drive shank engageable with a threaded fastener, an auxiliary motor, a main motor axially offset from the auxiliary motor and being drivingly connected thereto by a rotatable reduction gear cage the rotational speed of the cage being less than that of the main motor, an intermediate spindle drivingly connected to the auxiliary motor, and a forward gear cage enclosing planetary gearing interconnecting the intermediate spindle to the output spindle.
Claim 3
Dependent Claim
46 words
A two-speed pneumatically powered rotary nut runner according to claim 1, wherein a torque signal assembly is operatively associated with the main motor, said torque signal assembly being operative upon reverse rotation of the main motor to generate a pneumatic signal indicative of such reverse rotation.
Claim 4
Dependent Claim
34 words
A two-speed pneumatically powered rotary nut runner according to claim 2, wherein a transducer element is mounted adjacent the output spindle to monitor the torque exerted by the spindle upon a workpiece being tightened.
Claim 5
Dependent Claim
50 words
A two-speed pneumatically powered rotary nut runner according to claim 2, wherein said reduction gear cage is supported upon a bearing means mounted upon a shaft extension of the auxiliary motor, and has interior gears engageable by planetary gears which are pinioned in a rear end of the intermediate spindle.
Claim 6
Dependent Claim
68 words
A two-speed pneumatically powered rotary nut runner according to claim 4, wherein the forward gear cage is supported in bearing means mounted in the forward end of a main motor portion, the forward end of the gear cage being formed with spur gears in operative engagement with planetary gears pinioned in an enlarged rear end of the output spindle, and a housing portion surrounding the forward gear cage.
Claim 7
Dependent Claim
38 words
A two-speed pneumatically powered rotary nut runner according to claim 5, wherein th intermediate spindle is provided with spur gears at the forward end, which are in operative engagement with planetary gears pinioned in the forward gear cage.
Claim 8
Dependent Claim
56 words
A two-speed pneumatically powered rotary nut runner according to claim 6, wherein the housing portion surrounding the forward gear cage is provided with interior spline teeth in operative engagement with the planetary gears pinioned in the forward gear cage as well as with the planetary gears pinioned in the enlarged rear end of the output spindle.
Claim 9
Dependent Claim
54 words
A two-speed pneumatically powered rotary nut runner according to claim 7, wherein the main motor and the auxiliary motor are served by a common pressurized medium source, said main motor having a stall torque less than that of the auxiliary motor whereby the auxiliary motor is operative to deliver predetermined final work setting torque.
Claim 10
Dependent Claim
33 words
A two-speed pneumatically powered rotary nut runner according to claim 8, wherein when the auxiliary motor attains predetermined final work setting torque further rotation thereof causes a reverse rotation of the main motor.
Claim 11
Dependent Claim
100 words
A two-speed pneumatically powered rotary nut runner according to claim 9, wherein the torque signal assembly includes a clutch body mounted eccentric on the shaft of the main motor, a ring surrounding the clutch body and urged thereagainst by spring means, and a spring loaded ball which is forced by the ring into seating engagement with an air outlet passageway, when the clutch body is rotated by the main motor operating in reverse direction to cut off flow of pneumatic medium in the air outlet passageway thereby generating a signal indicative that predetermined torque has been exerted upon the workpiece.
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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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |