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Patent US3871714A successfully refreshed from Google Patents.
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US3871714A Expired / Lapsed US ⏱️ 0.0 years remaining

Fluid motor drive for lifting device such as a winch with accumulated pressure starting after brake release

Assignee: CNH Industrial Baumaschinen GmbH
•
Filing: 1973-07-23
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Granted: 1975-03-18
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Expires: 1993-07-23
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Abstract

Abstract A fluid pressure drive system for rotating a lifting device such as a winch includes a fluid motor having a drive shaft adapted to be connected to the winch which is engaged by a brake which may be actuated to stop the shaft by biasing means such as a spring. The fluid motor is driven by a pump which has a fluid pressure discharge connected to the motor which is also connected through a line to an accumulator. During pump operation the accumulator is charged with the pump operating pressure through a one way valve so that the accumulator stores the operating pressure during the operation of the motor to move the winch. The brake is released by forcing a fluid piston against the force of its biasing means to a releasing direction under the influence of actuating pressure which is supplied from a separate actuating pressure source. The actuating pressure source is connected through a control valve to a throttle and to a fluid pressure cylinder in which the fluid pressure piston which actuates the brake is movable. When the brake is applied the control valve is set so that the cylinder is vented to the atmosphere so that the biasing means may press the piston into an operative or brake engagement position. When the pump driving the fluid motor which operates the winch is stopped the control member is actuated to provide an actuating pressure connection through the throttle and to the control cylinder but also to a release valve for the accumulator pressure which is first connected to the line connected between the pump discharge and the motor to insure that the motor is held under operating pressure. The throttle in the line between the valve control and the brake control cylinder is set to regulate the pressure to the brake control cylinder in order that the brake may be released only after the accumulator pressure is communicated to the drive motor in order to insure that the drive motor is not subjected to the immediate loading of the winch would would cause a rapid unwinding of the winch.

Inventors

  • 👤 Volkmar Behrend

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 07:57
CPC Classifications
F; F16; F16H; F16H39/00; F16H39/02; B; B66; B66D; B66D5/00; B66D5/02; B66D5/24; B66D5/26; F16H63/00; F16H63/02; F16H63/30; F16H63/3023; F16H63/3026; F16H2063/3033; F16H61/00; F16H61/38; F16H61/40; F16H61/4157; Y; Y10; Y10S; Y10S60/00; Y10S60/905

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 135 words
In a fluid motor driven system for driving a rotatable shaft adapted to be connected to a load which is lifted and which has an actuating pressure source, a brake for stopping the shaft which is actuated by an actuating pressure source and in which a pump provides a fluid pressure discharge into a line connected to operate a fluid motor to drive the shaft, the improvement comprising an accumulator connected to the connection between the pump and the motor with means in said connection for permitting the actuating pressure source to be communicated to said accumulator, and an actuating pressure connection from the actuating pressure source to the brake for operating the brake and to the accumulator for operating the accumulator to connect the accumulator to the fluid motor before the brake is released.
Claim 2
Dependent Claim 135 words
In a fluid motor driven system for driving a rotatable shaft adapted to be connected to a load which is lifted and which has an actuating pressure source, a brake for stopping the shaft which is actuated by an actuating pressure source and in which a pump provides a fluid pressure discharge into a line connected to operate a fluid motor to drive the shaft, the improvement comprising an accumulator connected to the connection between the pump and the motor with means in said connection for permitting the actuating pressure source to be communicated to said accumulator, and an actuating pressure connection from the actuating pressure source to the brake for operating the brake and to the accumulator for operating the accumulator to connect the accumulator to the fluid motor before the brake is released.
Claim 3
Dependent Claim 279 words
A fluid drive system for a winch and similar lifting device, comprising a fluid drive motor having a drive shaft adapted to be connected to the lifting device, a brake connected to said drive shaft having a brake applying member which is engageable with said shaft for stopping said shaft, a brake control cylinder, a piston slidable in said control cylinder and engaged with said brake applying member for actuating said member to stop said shaft, means biasing said piston from one side of said cylinder to engage said brake applying member to stop said shaft, said piston being shiftable by brake actuating pressure against said biasing means, a control cylinder pressure line connected to said brake cylinder on the side opposite to said biasing means, an adjustable throttle member in said pressure line, a fluid drive pump having a pump discharge connected to said drive motor to drive said drive motor to rotate said shaft, a pressure accumulator having a pressure release valve connected to said pressure line for actuation by pressure therein, an accumulator pressure line connected from said accumulator to the communication between said pump discharge and said motor to supply accumulator pressure to said motor before the release of said brake, a valve control connected to said pump and to said pressure line venting said control cylinder when said piston actuates said brake but connecting said control cylinder to a source of actuating pressure to release said brake, a source of actuating pressure connected to said valve control, said throttle being set so that said actuating pressure acts on said release valve to connect said accumulating pressure to said motor before said brake is released.
Claim 4
Dependent Claim 279 words
A fluid drive system for a winch and similar lifting device, comprising a fluid drive motor having a drive shaft adapted to be connected to the lifting device, a brake connected to said drive shaft having a brake applying member which is engageable with said shaft for stopping said shaft, a brake control cylinder, a piston slidable in said control cylinder and engaged with said brake applying member for actuating said member to stop said shaft, means biasing said piston from one side of said cylinder to engage said brake applying member to stop said shaft, said piston being shiftable by brake actuating pressure against said biasing means, a control cylinder pressure line connected to said brake cylinder on the side opposite to said biasing means, an adjustable throttle member in said pressure line, a fluid drive pump having a pump discharge connected to said drive motor to drive said drive motor to rotate said shaft, a pressure accumulator having a pressure release valve connected to said pressure line for actuation by pressure therein, an accumulator pressure line connected from said accumulator to the communication between said pump discharge and said motor to supply accumulator pressure to said motor before the release of said brake, a valve control connected to said pump and to said pressure line venting said control cylinder when said piston actuates said brake but connecting said control cylinder to a source of actuating pressure to release said brake, a source of actuating pressure connected to said valve control, said throttle being set so that said actuating pressure acts on said release valve to connect said accumulating pressure to said motor before said brake is released.
Claim 5
Dependent Claim 37 words
A drive according to claim 2, wherein said pressure release valve comprises a releasable non return valve permitting flow from the connection between said pump and said fluid motor to said accumulator during operation of said pump.
Claim 6
Dependent Claim 58 words
A drive according to claim 2, wherein said valve control is connected to said actuating pressure source and to an electric motor for driving said pump and including an electric motor connected to said pump for driving said pump, said release valve having a branch connection to said section between said valve control and said brake control cylinder.
Claim 7
Dependent Claim 11 words
A drive acording to claim 2, wherein said throttle is adjustable.

References Cited (Backward Citations)

US2459663A Cited
US2576359A Cited
US2827763A Cited
US3249336A Cited
US3439579A Cited
US3764111A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-03-17 1978-09-16 1979-03-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-03-17 1982-09-16 1983-03-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-03-17 1986-09-16 1987-03-18 $7700.00 Window Closed / Lapsed

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