US4512555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Idling device for lever hoist
Assignee: Kito KK
•
Filing: 1983-06-24
•
Granted: 1985-04-23
•
Expires: 2003-06-24
Abstract
Abstract An idling device is able to bring into an idling condition a lever hoist including a change gear provided on driving member threadedly engaged on a driving shaft for driving a sheave winding-up thereabout a chain or rope for a load, an operating lever rockably driven by a hand, winding-up and winding-off driving pawls engageable with teeth of the change gear and changeable in response to the purpose of hoisting or lowering the load, and a braking assembly for preventing the change gear from being driven by a gravity of the load and adapted to be clamped and released by rotative movement of the driving member relative to said driving shaft. According to the invention the idling device comprises brake clamped position holding means between the driving shaft and a manually operatable knob fitted rotatably and axially slidably on the driving shaft and brake over-released preventing means between the driving shaft and the driving member or the knob, thereby enabling the braking assembly to be changed from its clamped condition into its released condition and vice versa by simple operation and capable of preventing the braking assembly from excessively releasing.
Inventors
- 👤 Takayoshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:51
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/12; B66D3/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
306 words
An idling device for a lever hoist including a change gear provided on a driving member threadedly engaged on a driving shaft for driving a sheave winding up thereabout a chain, rope or the like for a load, an operating lever rockable about said driving member by a hand, a winding-up driving pawl engageable with teeth of said change gear and driven by said operating lever in a winding-up direction for the load, and a braking assembly preventing said change gear from being driven from a side of said sheave and being clamped and released by rotative movement of said driving member relative to said driving shaft, said device comprising an anchoring member fixed to an end of said driving shaft on an opposite side of said braking assembly with respect to said driving member, a manually operatable knob arranged between said driving member and said anchoring member and fitted rotatably and axially slidably on said driving shaft relative thereto, a brake releasing torsion spring arranged between said manually operatable knob and said anchoring member to rotate said manually operatable knob into a brake releasing direction relative to said driving shaft, a brake clamping torsion spring arranged between said driving member and said manually operatable knob to rotate said driving member into a brake clamping direction relative to said manually operatable knob, engagement protrusions formed in said driving member and said manually operatable knob, respectively, and engaging with each other by urging by said brake clamping torsion spring to couple said driving member and said manually operatable knob, brake clamped position holding means for preventing said driving member from rotating into a brake releasing direction when said braking assembly is clamped, and brake over-released preventing means for preventing said driving member from further rotating into said brake releasing direction when said braking assembly is suitably released.
Claim 2
Dependent Claim
306 words
An idling device for a lever hoist including a change gear provided on a driving member threadedly engaged on a driving shaft for driving a sheave winding up thereabout a chain, rope or the like for a load, an operating lever rockable about said driving member by a hand, a winding-up driving pawl engageable with teeth of said change gear and driven by said operating lever in a winding-up direction for the load, and a braking assembly preventing said change gear from being driven from a side of said sheave and being clamped and released by rotative movement of said driving member relative to said driving shaft, said device comprising an anchoring member fixed to an end of said driving shaft on an opposite side of said braking assembly with respect to said driving member, a manually operatable knob arranged between said driving member and said anchoring member and fitted rotatably and axially slidably on said driving shaft relative thereto, a brake releasing torsion spring arranged between said manually operatable knob and said anchoring member to rotate said manually operatable knob into a brake releasing direction relative to said driving shaft, a brake clamping torsion spring arranged between said driving member and said manually operatable knob to rotate said driving member into a brake clamping direction relative to said manually operatable knob, engagement protrusions formed in said driving member and said manually operatable knob, respectively, and engaging with each other by urging by said brake clamping torsion spring to couple said driving member and said manually operatable knob, brake clamped position holding means for preventing said driving member from rotating into a brake releasing direction when said braking assembly is clamped, and brake over-released preventing means for preventing said driving member from further rotating into said brake releasing direction when said braking assembly is suitably released.
Claim 3
Dependent Claim
41 words
An idling device as set forth in claim 1, wherein said manually operatable knob is formed as a hollow cylinder whose bottomed end is arranged on a side of said driving member and whose opened end slidably receives said anchoring member.
Claim 4
Dependent Claim
42 words
An idling device as set forth in claim 1, wherein said engagement protrusions are arranged in a circle when assembled in the lever hoist and each set of the protrusions of the driving member and the manually operatable knob are diametrically opposed.
Claim 5
Dependent Claim
114 words
An idling device as set forth in claim 1, wherein said brake clamped position holding means comprises side surfaces of grooves formed in said manually operatable knob on a side facing to said driving member, and engagement projections fixed to said driving shaft which engage said side surfaces of said grooves of the knob to prevent said driving member from rotating into said brake releasing direction, and said brake over-released preventing means comprises said engagement projections fixed to said driving shaft and further engagement projections formed in said driving member so as to engage said engagement projections of the driving shaft to prevent said driving member from further rotating into said brake releasing direction.
Claim 6
Dependent Claim
56 words
An idling device as set forth in claim 4, on said driving shaft is fixedly fitted a support sleeve on which said manually operatable knob is fitted rotatably and axially slidably relative to said support sleeve and hence said driving shaft, and said engagement projections fixed to said driving shaft are formed on said support sleeve.
Claim 7
Dependent Claim
115 words
An idling device as set forth in claim 1, wherein said brake clamped position holding means comprises side surfaces of grooves formed in said manually operatable knob on a side facing to said driving member, and engagement projections fixed to said driving shaft which engage said side surfaces of said grooves of the knob to prevent said driving member from rotating into said brake releasing direction, and said brake over-released preventing means comprises said engagement projections fixed to said driving shaft and further engagement projections formed in said manually operatable knob so as to engage said engagement projections of the driving shaft to prevent said driving member from further rotating into said brake releasing direction.
Claim 8
Dependent Claim
56 words
An idling device as set forth in claim 6, on said driving shaft is fixedly fitted a support sleeve on which said manually operatable knob is fitted rotatably and axially slidably relative to said support sleeve and hence said driving shaft, and said engagement projections fixed to said driving shaft are formed on said support sleeve.
Claim 9
Dependent Claim
107 words
An idling device as set forth in claim 1, wherein said brake clamped position holding means comprises side surfaces of grooves formed in said driving shaft, and engagement projections formed in said manually operatable knob which engage said side surfaces of said grooves of said driving shaft to prevent said driving member from rotating into said brake releasing direction, and said brake over-released preventing means comprises said engagement projections formed in said manually operatable knob and further engagement projections formed in said driving shaft so as to engage said engagement projections of the knob to prevent said driving member from further rotating into said brake releasing direction.
Claim 10
Dependent Claim
61 words
An idling device as set forth in claim 8, on said driving shaft is fixedly fitted a support sleeve on which said manually operatable knob is fitted rotatably and axially slidably relative to said support sleeve and hence said driving shaft, and said grooves and said engagement projections fixed to said driving shaft are formed in and on said support sleeve.
Claim 11
Dependent Claim
75 words
An idling device as set forth in any one of claims 4, 6 and 8, wherein remaining side surfaces of said grooves for constituting said brake clamped position holding means form brake clamping rotation limiting stoppers which engage the mating engagement projections of said brake clamped position holding means to limit the driving member from further rotating before the engagement of said side surfaces and said engagement projections of said brake clamped position holding means.
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) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |