US3667620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained unloading apparatus
Assignee: WISCONSIN FOUNDRY AND MACHINE
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Filing: 1970-10-20
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Granted: 1972-06-06
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Expires: 1990-10-20
Abstract
Abstract A material handling unit for detachable connection to the rear end of a vehicle and which permits gravitational unloading of heavy objects such as heavy concrete pipes from the bed of a truck. The unit is self-contained and can be easily attached to or detached from the vehicle. The unit contains its own hydraulic system including the extensible cylinders, fluid pump, reservoir and control apparatus.
Inventors
- 👤 Harry Steiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:34
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/64; B60P1/6418; B60P1/6472
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
Apparatus for gravitationally unloading objects from the edge of an elevated platform or the like, comprising: an upright frame extending downwardly from said platform; arm means pivotally mounted on said frame and having a free end swingable between an upper position above said platform for receiving an object and a lower position for discharging said object; guide rail means mounted on said frame and extending downwardly and inclined away from said frame to a lower surface for guiding said object downwardly therealong as said arm means swings from said upper to said lower position; and power operated means carried on said frame for swinging said arm means.
Claim 2
Dependent Claim
107 words
Apparatus for gravitationally unloading objects from the edge of an elevated platform or the like, comprising: an upright frame extending downwardly from said platform; arm means pivotally mounted on said frame and having a free end swingable between an upper position above said platform for receiving an object and a lower position for discharging said object; guide rail means mounted on said frame and extending downwardly and inclined away from said frame to a lower surface for guiding said object downwardly therealong as said arm means swings from said upper to said lower position; and power operated means carried on said frame for swinging said arm means.
Claim 3
Dependent Claim
81 words
The apparatus set forth in claim 1 further characterized in that said power operated means comprises, an electric motor driven fluid pump mounted on said frame, extensible cylinder means connected between said frame and said arm means and actuated by said fluid pump for swinging said arm means, a fluid reservoir mounted on said frame and in fluid communication with said pump means, and fluid control means on said frame and connected with said pump for coNtrolling said power operated means.
Claim 4
Dependent Claim
28 words
The apparatus set forth in claim 2 further characterized in that said reservoir comprises a tubular member welded to said frame and also acting to rigidify said frame.
Claim 5
Dependent Claim
27 words
The apparatus as claimed in claim 2 further characterized in that said control means includes a throttling valve for regulating the lowering movement of said arm means.
Claim 6
Dependent Claim
27 words
The apparatus as claimed in claim 3 further characterized in that said control means includes a throttling valve for regulating the lowering movement of said arm means.
Claim 7
Dependent Claim
32 words
The apparatus of claim 1 including a shiftable connection between said frame and said guide rail means whereby the latter can be swung to an upper position on said frame for storage.
Claim 8
Dependent Claim
161 words
A self contained apparatus for gravitationally unloading objects from an elevated platform or the like and comprising: an upright frame extending downwardly from said platform; arm means pivotally mounted on said frame and having a free end swingable between an upper position for receiving an object to be unloaded and a lower position for discharging said object; guide rail means mounted on said frame and extending downwardly and inclined away from said frame and to a lower position for guiding said object downwardly therealong as said arm means swings from said upper to said lower position; power operated means carried on said frame for swinging said arm means, said power operated means including a fluid pump mounted on said frame, extensible cylinder means connected between said frame and said arm means and actuated by said fluid pump for swinging said arm means; and a fluid reservoir comprising a tubular member welded to said frame and also acting to rigidify said frame.
Claim 9
Dependent Claim
161 words
A self contained apparatus for gravitationally unloading objects from an elevated platform or the like and comprising: an upright frame extending downwardly from said platform; arm means pivotally mounted on said frame and having a free end swingable between an upper position for receiving an object to be unloaded and a lower position for discharging said object; guide rail means mounted on said frame and extending downwardly and inclined away from said frame and to a lower position for guiding said object downwardly therealong as said arm means swings from said upper to said lower position; power operated means carried on said frame for swinging said arm means, said power operated means including a fluid pump mounted on said frame, extensible cylinder means connected between said frame and said arm means and actuated by said fluid pump for swinging said arm means; and a fluid reservoir comprising a tubular member welded to said frame and also acting to rigidify said frame.
Claim 10
Dependent Claim
41 words
The apparatus as claimed in claim 7 including fluid control means on said frame and connected with said pump for controlling said power operated means, said control means including a throttling valve for regulating the lowering movement of said arm means.
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |