US3700060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traction mechanism actuated pressure source
Assignee: Eaton Corp
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Filing: 1971-04-30
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Granted: 1972-10-24
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Expires: 1991-04-30
Abstract
Abstract In a vehicle such as an industrial truck, the traction mechanism operates a pump to charge an accumulator. When the traction mechanism is power actuated to propel the truck, the fluid moving through the pump is directed through a pressure free circuit in bypass relation to the accumulator so that the pump requires very little power. When power to the traction mechanism is withdrawn, as when the vehicle is coasting, the bypass circuit for the fluid moving through the pump is closed, and the fluid is directed to the accumulator to be charged. This charging of the accumulator acts to brake the traction mechanism, so that beneficial braking of the vehicle is contributed at the same time that the accumulator is charged. If, at any time, the accumulator does not have sufficient charge when a particular pressure operated device is to be operated, the circuit of an electric motor driving an auxiliary pump is actuated automatically so as to bring about the operation of the pressure operated device.
Inventors
- 👤 Derek K Keene
- 👤 John J Mcelhare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:46
CPC Classifications
B; B60; B60K; B60K25/00; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/148
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
In a vehicle Of the class described, traction mechanism for said vehicle, a traction motor for driving said traction mechanism, a pump operable upon movement of said vehicle, and to pump fluid through a relatively pressure free hydraulic circuit when said motor drives said vehicle by said traction mechanism, and means for directing the fluid from said pump to a second hydraulic circuit against pressure means when said traction motor is not driving said traction mechanism and said vehicle is moving, whereby said pump acts as a dynamic brake.
Claim 2
Dependent Claim
89 words
In a vehicle Of the class described, traction mechanism for said vehicle, a traction motor for driving said traction mechanism, a pump operable upon movement of said vehicle, and to pump fluid through a relatively pressure free hydraulic circuit when said motor drives said vehicle by said traction mechanism, and means for directing the fluid from said pump to a second hydraulic circuit against pressure means when said traction motor is not driving said traction mechanism and said vehicle is moving, whereby said pump acts as a dynamic brake.
Claim 3
Dependent Claim
29 words
In the combination of claim 1, the feature that said pressure means is an accumulator for storing pressure to be utilized to operate hydraulically actuated mechanism on said vehicle.
Claim 4
Dependent Claim
21 words
In the combination of claim 2, the feature that said pressure free hydraulic circuit is in bypass relation to said accumulator.
Claim 5
Dependent Claim
43 words
In the combination of claim 1, the feature that said motor is an electric motor in an electric traction circuit, and means whereby the opening of said traction circuit is a prerequisite to the directing of the fluid to said second hydraulic circuit.
Claim 6
Dependent Claim
73 words
In the combination of claim 2, the feature that said hydraulically actuated mechanism is functionally in the circuit of a second pump driven by a pump motor, and means whereby said second pump and motor are rendered effective to apply hydraulic pressure to said hydraulically actuated mechanism when said accumulator is pressure charged by said traction mechanism below a predetermined level, and ineffective when said accumulator is pressure charged above said predetermined level.
Claim 7
Dependent Claim
106 words
In the combination of claim 1, the feature that said pump is driven by said traction mechanism and that said pressure means is an accumulator connected by a suitable hydraulic circuit with said pump for charging thereby, said free hydraulic circuit being a bypass hydraulic circuit for said pump for bypassing said accumulator, means for maintaining one or the other of said hydraulic circuits open while maintaining the other of said circuits closed, and means whereby the motor drive is operable to said traction mechanism when said bypass circuit is open, and is not operable to drive said traction mechanism when said accumulator circuit is open.
Claim 8
Dependent Claim
78 words
In a vehicle of the class described, a traction motor, a traction mechanism through which said motor propels said vehicle, a pump, an accumulator adapted to be charged by said pump, means rendering said pump operative to charge said accumulator when said vehicle is moving under conditions wherein said vehicle is not propelled by said motor, and means rendering said pump inoperative to charge said accumulator when said vehicle is propelled by said motor through said traction mechanism.
Claim 9
Dependent Claim
78 words
In a vehicle of the class described, a traction motor, a traction mechanism through which said motor propels said vehicle, a pump, an accumulator adapted to be charged by said pump, means rendering said pump operative to charge said accumulator when said vehicle is moving under conditions wherein said vehicle is not propelled by said motor, and means rendering said pump inoperative to charge said accumulator when said vehicle is propelled by said motor through said traction mechanism.
Claim 10
Dependent Claim
40 words
In the combination of claim 6, the feature that said motor is an electric motor and that the said pump is actuated by the momentum of the vehicle to charge the accumulator when said motor is not propelling said vehicle.
Claim 11
Dependent Claim
16 words
The combination of claim 6, in which said pump is operatively connected to said traction mechanism.
References Cited (Backward Citations)
US1904611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |