US3752325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loading balancer
Assignee: Tsudakoma Corp
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Filing: 1971-11-16
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Granted: 1973-08-14
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Expires: 1991-11-16
Abstract
Abstract A loading balancer including a pivotal intermediate arm and accompanying main-and auxiliary pressure cylinders wherein changes in the position of the hoisted load in the vertical plane are mechanically converted into corresponding changes in the turning moment about the pivotal point of the intermediate shaft and such changes in the moment are automatically balanced by corresponding changes in the pressure forces provided by the pressure cylinders upon sensing said changes in the moment.
Inventors
- 👤 K Sato
- 👤 K Yamazaki
- 👤 I Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:24
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/005; B66C13/00; B66C13/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
204 words
An improved loading balancer comprising, in combination, a stationary upright stand, a supporter block pivotally mounted on said upright stand for rotation about a vertical axis whereby said supporter block is horizontally rotatable about said axis, a supporter shaft horizontally mounted on said supporter block for movement to-and-fro with respect to said supporter block, an elongated intermediate arm pivoted on said supporter shaft, a hoist arm pivoted to one end of said intermediate arm and for hoisting the load at its free end, a link arm pivoted to the other end of said intermediate arm, means for co-relating pivotal movement of said hoist arm with that of said link arm, a main pressure cylinder disposed on said supporter block and linked to one end of said link arm, an auxiliary pressure cylinder, means for coupling said auxiliary pressure cylinder to said intermediate arm at a point spaced from said supporter shaft to compensate for the self weight of the intermediate arm and hoist arm whereby the load is solely supported by said main pressure cylinder, a pressure source, a pressure system connecting said two pressure cylinders to said pressure source and an electric system including switches for controlling the operation of said pressure system.
Claim 2
Dependent Claim
204 words
An improved loading balancer comprising, in combination, a stationary upright stand, a supporter block pivotally mounted on said upright stand for rotation about a vertical axis whereby said supporter block is horizontally rotatable about said axis, a supporter shaft horizontally mounted on said supporter block for movement to-and-fro with respect to said supporter block, an elongated intermediate arm pivoted on said supporter shaft, a hoist arm pivoted to one end of said intermediate arm and for hoisting the load at its free end, a link arm pivoted to the other end of said intermediate arm, means for co-relating pivotal movement of said hoist arm with that of said link arm, a main pressure cylinder disposed on said supporter block and linked to one end of said link arm, an auxiliary pressure cylinder, means for coupling said auxiliary pressure cylinder to said intermediate arm at a point spaced from said supporter shaft to compensate for the self weight of the intermediate arm and hoist arm whereby the load is solely supported by said main pressure cylinder, a pressure source, a pressure system connecting said two pressure cylinders to said pressure source and an electric system including switches for controlling the operation of said pressure system.
Claim 3
Dependent Claim
77 words
An improved loading balancer of claim 1, wherein said co-relating means comprises a sprocket wheel disposed on said intermediate arm rotatable about the pivotal point of said hoist arm in synchronism with the pivotal movement of said hoist arm, another sprocket wheel disposed on said intermediate arm rotatable about the pivotal point of said link arm in synchronism with the pivotal movement of said link arm and an endless chain running in engagement with said two sprockets.
Claim 4
Dependent Claim
48 words
An improved loading balancer of claim 1, wherein said transmitting means comprises a carriage mounted on said supporter block in a to-and-fro slidable arrangement and a displacer disposed on said carriage in an up-and-down slidable arrangement and connected to said auxiliary pressure cylinder to said given pressure source.
Claim 5
Dependent Claim
50 words
An improved loading balancer of claim 1, wherein said pressure system comprises a main pressure system for connecting said main pressure cylinder to said given pressure source and an auxiliary pressure system branched from said main pressure system and for connecting said auxiliary pressure cylinder to said given pressure source.
Claim 6
Dependent Claim
101 words
An improved loading balancer of claim 4, wherein said main pressure system comprises a 4 port valve connected at its inlet to said given pressure source and electrO-magnetically piloted by said electric system; a 3 port valve connected at its inlet to said 4 port valve, connected at its outlet to said main pressure cylinder and electromagnetically controlled by said electric system; a buster relay connected at its inlet to said 4 port valve and at its outlet to said main pressure cylinder; and a 2 port pressure valve connected to said 4 port valve, buster relay and main pressure cylinder.
Claim 7
Dependent Claim
57 words
An improved loading balancer of claim 4, wherein said auxiliary pressure system comprises a buster relay connected at its inlet to said given pressure source and at its outlet to said auxiliary pressure cylinder; and a reducing valve bypassed from the conduit between said given pressure source and said buster relay, and connected to said buster relay.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |