US3884378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift arm assembly for loader vehicles
Assignee: Caterpillar Inc
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Filing: 1973-10-23
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Granted: 1975-05-20
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Expires: 1993-10-23
Abstract
Abstract The lift arms of a loader are pivoted to the vehicle at one end and carry a material receiving bucket at the other end, extensible fluid pressure actuated cylinders being connected between the vehicle and lift arms to raise and lower the bucket. To reduce breakage and to facilitate assembly and disassembly without requiring a costly construction, the connection between each fluid cylinder and associated lift arm is formed by a pair of plates disposed one on each side of the lift arm with each plate having a portion extending below the arm. One end of the fluid cylinder is received between the lower portions of the plates and coupled thereto by pivot means. The plates are in turn joined to the lift arms by a pair of removable cross pins which are transpierced through the plates and lift arms at widely spaced points along the length of the arm to distribute stress.
Inventors
- 👤 Donald R Muellner
- 👤 Richard J Piercy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:11
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/34; E02F3/3405; E02F3/3411
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
253 words
Lift arm mechanism for a loader vehicle which has an elevatable bucket for receiving and lifting material comprising: a lift arm having first and second ends and having an intermediate section between said ends, first pivot means for coupling said first end of said lift arm to said vehicle and providing for raising and lowering of said second end thereof, means for attaching said bucket to said second end of said lift arm, a pair of plates disposed adjacent said intermediate section of said lift arm each being at a separate side thereof and each having a lower portion extending below said lift arm, a linear fluid motor having one end pivotally connected to said vehicle and having an opposite end extending between said lower portions of said plates, second pivot means coupling said opposite end of said fluid motor to said lower portions of said plates, a pair of removable cross pins each being transpierced through said plates and said intermediate section of said lift arm at spaced apart positions along said intermediate section of said arm with one of said cross pins being situated closer to said first end of arm than said second pivot means and the other of said cross pins being closer to said second end of said arm than said second pivot means whereby stress forces are divided between spaced apart regions of said lift arm, and a pair of spaced apart supplementary cross pins extending between said lower portions of said plates below said lift arm.
Claim 2
Dependent Claim
253 words
Lift arm mechanism for a loader vehicle which has an elevatable bucket for receiving and lifting material comprising: a lift arm having first and second ends and having an intermediate section between said ends, first pivot means for coupling said first end of said lift arm to said vehicle and providing for raising and lowering of said second end thereof, means for attaching said bucket to said second end of said lift arm, a pair of plates disposed adjacent said intermediate section of said lift arm each being at a separate side thereof and each having a lower portion extending below said lift arm, a linear fluid motor having one end pivotally connected to said vehicle and having an opposite end extending between said lower portions of said plates, second pivot means coupling said opposite end of said fluid motor to said lower portions of said plates, a pair of removable cross pins each being transpierced through said plates and said intermediate section of said lift arm at spaced apart positions along said intermediate section of said arm with one of said cross pins being situated closer to said first end of arm than said second pivot means and the other of said cross pins being closer to said second end of said arm than said second pivot means whereby stress forces are divided between spaced apart regions of said lift arm, and a pair of spaced apart supplementary cross pins extending between said lower portions of said plates below said lift arm.
Claim 3
Dependent Claim
37 words
The combination defined in claim 1 wherein said cross pins are of the form having bolt means for axially compressing said pins to thereby cause radial expansion of said pins to wedge said pins in said plates.
Claim 4
Dependent Claim
24 words
The combination defined in claim 1 wherein said supplementary cross pins extend between said plates immediately below the lower surface of said lift arm.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |