US3832094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pump
Assignee: YORK FLUID POWER Inc
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Filing: 1973-03-23
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Granted: 1974-08-27
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Expires: 1993-03-23
Abstract
Abstract A piston type hydraulic pump characterized by a relief clutch apparatus which functions to detect the occurrence of contaminates in the pumping oil and to automatically protect the internal working components of the pumping mechanism from damage by such contaminates. More specifically, the relief clutch is arranged to automatically and substantially instantly relieve the pumping pistons from the forces of the piston driving cam upon the occurrence of any abnormal forces imposed on any one of the pistons by binding action of the contaminates. Hence actuation of the pistons is automatically stopped prior to the occurrence of irreparable damage to the machine.
Inventors
- 👤 R Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:18
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/26; F04B1/28; F04B1/122; F04B1/124; F04B1/126; F04B1/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A hydraulic pump comprising, in combination, housing means, a plurality of cylinders in said housing means; a plurality of pistons disposed in said cylinders; drive shaft means including a cam engaging said pistons; a piston return yoke engaging said pistons; resilient means biasing said yoke against said pistons; and relief clutch means for modifying the biasing effect of said resilient means on said yoke to relieve the pistons of the driving force of the cam.
Claim 2
Dependent Claim
75 words
A hydraulic pump comprising, in combination, housing means, a plurality of cylinders in said housing means; a plurality of pistons disposed in said cylinders; drive shaft means including a cam engaging said pistons; a piston return yoke engaging said pistons; resilient means biasing said yoke against said pistons; and relief clutch means for modifying the biasing effect of said resilient means on said yoke to relieve the pistons of the driving force of the cam.
Claim 3
Dependent Claim
105 words
A hydraulic pump comprising, in combination, housing means, a plurality of cylinders in said housing means; a plurality of pistons disposed in said cylinders; drive shaft means including a cam engaging said pistons; a piston return yoke engaging said pistons; a piston return rod slideably mounted in said housing means and engaging said piston return yoke; a piston return spring between said piston return rod and said housing means for biasing said piston return rod against said yoke; and relief clutch means for disengaging said piston return spring from said piston return rod and thereby relieve the pistons of the driving force of the cam.
Claim 4
Dependent Claim
105 words
A hydraulic pump comprising, in combination, housing means, a plurality of cylinders in said housing means; a plurality of pistons disposed in said cylinders; drive shaft means including a cam engaging said pistons; a piston return yoke engaging said pistons; a piston return rod slideably mounted in said housing means and engaging said piston return yoke; a piston return spring between said piston return rod and said housing means for biasing said piston return rod against said yoke; and relief clutch means for disengaging said piston return spring from said piston return rod and thereby relieve the pistons of the driving force of the cam.
Claim 5
Dependent Claim
115 words
A hydraulic pump comprising, in combination, housing means, a plurality of cylinders in said housing means; a plurality of pistons disposed in said cylinders; drive shaft means including a cam engaging said pistons; a piston return yoke engaging said pistons; A piston return rod slideably mounted in said housing means and including a first end engaging said yoke and a second end provided with a bore; relief clutch jaw means disposed in said bore and laterally movable between a spring retaining position and a spring releasing position; a piston return spring normally disposed in compressed relationship between said relief clutch jaw means and said housing means; and actuating means for said relief clutch jaw means.
Claim 6
Dependent Claim
115 words
A hydraulic pump comprising, in combination, housing means, a plurality of cylinders in said housing means; a plurality of pistons disposed in said cylinders; drive shaft means including a cam engaging said pistons; a piston return yoke engaging said pistons; A piston return rod slideably mounted in said housing means and including a first end engaging said yoke and a second end provided with a bore; relief clutch jaw means disposed in said bore and laterally movable between a spring retaining position and a spring releasing position; a piston return spring normally disposed in compressed relationship between said relief clutch jaw means and said housing means; and actuating means for said relief clutch jaw means.
Claim 7
Dependent Claim
45 words
The apparatus defined in claim 3 wherein said actuating means comprises an actuating pin disposed in said jaw means for normally holding said jaw means in said spring retaining position, said actuating pin being adapted to release said jaw means to said spring releasing position.
Claim 8
Dependent Claim
72 words
The apparatus defined in claim 3 wherein said actuating means comprises a jaw actuating pin slideably mounted in said rElief clutch jaw means between jaw retaining and jaw releasing positions; and a pin engaging member mounted on said housing means in confronting relationship with said actuating pin whereby engagement of said actuating pin with said pin engaging member shifts said pin and thereby releases said jaw means to said spring releasing position.
Claim 9
Dependent Claim
118 words
The apparatus defined in claim 3 wherein said actuating means comprises a jaw actuating pin slideably mounted in said relief clutch jaw means between jaw retaining and jaw releasing positions; and a pin engaging member mounted on said housing means in confronting relationship with said actuating pin, said piston return rod, relief clutch jaw means, and actuating pin being longitudinally shiftable by the occurrence of a bending moment imposed on said piston return yoke as a result of excessive frictional drag occurring between one of said pistons and cylinders, said longitudinal shifting serving to cause said jaw actuating pin to engage said pin engaging member whereby said actuating pin releases said jaw means to said spring releasing position.
Claim 10
Dependent Claim
101 words
The apparatus defined in claim 3 wherein said actuating means comprises a jaw actuating pin slideably mounted in said relief clutch jaw means between jaw retaining and jaw releasing positions; and a pin engaging member mounted for longitudinal movement on said housing means between a released position and a pin engaging position, said pin engaging member including an outer end extending to the exterior of said housing whereby force exerted on said outer end shifts said pin engaging member into engagement with said jaw actuating pin whereby said pin is shifted to release said jaw means to said spring releasing position.
Claim 11
Dependent Claim
24 words
The apparatus defined in claim 7 that includes a pressure responsive sensing means operatively associated with said outer end of said pin engaging member.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |