US3780990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake controlling device
Assignee: Haegglund and Soener AB
•
Filing: 1972-01-24
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Granted: 1973-12-25
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Expires: 1992-01-24
Abstract
Abstract The present invention relates to a device for controlling the brake in winches which are driven by a hydraulic motor and have a brake which is engaged when not actuated and arranged to disengage when a pressure medium is delivered to a hydraulic cylinder connected to the brake. The invention is chiefly characterized by a brake controlling unit which is connected to the high pressure side of the motor and is arranged to regulate the supply of pressure medium to the brake''s hydraulic cylinder, depending on the size of the motor load, so that during a lifting operation, the brake releases only after the pressure on the motor''s high pressure side substantially corresponds to the pressure required to balance the load. In addition, means are provided to release the brake at a pressure during lowering of the load, independent of the size of the load.
Inventors
- 👤 S Edlund
- 👤 B Sodersten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:31
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/04; B; B66; B66D; B66D1/00; B66D1/02; B66D1/08; B66D5/00; B66D5/02; B66D5/24; B66D5/26; F15B11/003; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0133; B66D2700/03; B66D2700/035; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/321; F15B2211/324; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/41; F15B2211/413; F15B2211/415; F15B2211/41581; F15B2211/42; F15B2211/428; F15B2211/46; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6054; F15B2211/625; F15B2211/70; F15B2211/705; F15B2211/7058; F16; F16H; F16H63/00; F16H63/02; F16H63/30; F16H63/3023; F16H63/3026; F16H2063/3033; F16H61/00; F16H61/38; F16H61/40; F16H61/4157
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
269 words
Device for brake control in winches driven by a hydraulic motor, said winches having a brake which is engaged when not actuated, said brake being arranged to release by means of the delivery of pressure medium to a hydraulic cylinder connected to the brake, characterize by a brake controlling unit which is connected to the high pressure side of the motor and is arranged to regulate the supply of pressure medium to the brake''s hydraulic cylinder, depending on the size of the motor load, so that during a lifting operation, the brake releases only after the pressure on the motor''s high pressure side substantially corresponds to the pressure required to balance the load, means being arranged in order to release the brake at a pressure, during lowering of the load, independent of the size of the load, said brake control unit comprises a hydraulic pressure accmmulator, which is connected with the motor''s high pressure line over a non-return valve that opens away from said motor, and a spring-loaded control valve which is arranged in a pressure medium supply line to the brake cylinder and which, on the one side, communicates with the accumulator and is actuated by the pressure in said accumulator against the effect of the force of the spring towards a first position, at which pressure medium delivery to the brake cylinder is interrupted and, on the other side, communicates with the motor''s high pressure line and is actuated by the pressure in same towards a second position, at which the control valve is open to allow free passage of the pressure medium to the brake cylinder.
Claim 2
Dependent Claim
269 words
Device for brake control in winches driven by a hydraulic motor, said winches having a brake which is engaged when not actuated, said brake being arranged to release by means of the delivery of pressure medium to a hydraulic cylinder connected to the brake, characterize by a brake controlling unit which is connected to the high pressure side of the motor and is arranged to regulate the supply of pressure medium to the brake''s hydraulic cylinder, depending on the size of the motor load, so that during a lifting operation, the brake releases only after the pressure on the motor''s high pressure side substantially corresponds to the pressure required to balance the load, means being arranged in order to release the brake at a pressure, during lowering of the load, independent of the size of the load, said brake control unit comprises a hydraulic pressure accmmulator, which is connected with the motor''s high pressure line over a non-return valve that opens away from said motor, and a spring-loaded control valve which is arranged in a pressure medium supply line to the brake cylinder and which, on the one side, communicates with the accumulator and is actuated by the pressure in said accumulator against the effect of the force of the spring towards a first position, at which pressure medium delivery to the brake cylinder is interrupted and, on the other side, communicates with the motor''s high pressure line and is actuated by the pressure in same towards a second position, at which the control valve is open to allow free passage of the pressure medium to the brake cylinder.
Claim 3
Dependent Claim
68 words
Device according to claim 1, characterized in that the pressure medium line, which is connected between the control valve and the brake cylinder, communicates via a reverse valve with the low pressure side of the motor, and that a short-circuit valve is coupled over the non-return valve and the pressure accumulator, said short-circuit valve being arranged to be controlled by the pressure on the motor''s low pressure side.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |