Brakes – Wheel – One-way brakes
Patent
1993-04-01
1995-02-14
Oberleitner, Robert J.
Brakes
Wheel
One-way brakes
188 30, 188 77R, 188 7956, F16D 5900, B60T 100
Patent
active
053886720
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to anti-roll-back devices for the selective prevention of reverse rotation of a rotatable member, and particularly but not exclusively for a device for use in vehicles.
When a vehicle is on an inclined road and facing uphill, the handbrake may not hold the vehicle against rolling back, particularly if the vehicle is heavy or heavily laden. Furthermore, when the vehicle is only temporarily brought to a halt, many drivers do not apply the handbrake but hold the car against rolling back by partially engaging the clutch to a degree sufficient to hold the vehicle stationary. This causes unnecessary wear of the clutch plates.
One proposal to overcome this problem uses a loop or noose which extends from an anchor point around a rotatable member such as the vehicle drive shaft, to a further anchor point. The arrangement is such that when the drive shaft is rotating in the forward direction of the vehicle, the loop or noose remains slack around the shaft, but as soon as the shaft attempts to rotate in the reverse direction, the loop or noose tightens on the shaft to prevent that reverse rotation. In order to enable reverse rotation when that is required, an arrangement is provided which is selectively activatable to prevent the loop or noose tightening on the shaft during reverse rotation. Conveniently, the arrangement is activated when reverse gear is selected.
The present invention seeks to provide an improved device of the type described above.
According to one aspect of the invention, there is provided an anti-roll-back device for a rotatable member, comprising a second member located adjacent the rotatable member, a loop or noose secured at one end to the second member and extending around the rotatable member to pass around a guide member secured to the second member, the loop or noose then extending to a movable member, and there being releasable locking means operable to hold the movable member against movement and to release the movable member to move as and when required.
The movable member may be a pivotal member. The pivotal member may be mounted on a pivot located in fixed spaced relationship to the rotatable member.
The loop or noose may be anchored to the pivotal member.
Preferably the locking means incorporate bias means operable to provide a bias force to cause or assist in movement of the movable member. The bias means may comprise a resilient member.
The locking means may comprise a remotely controllable actuator, such as a solenoid. The actuator preferably controls a latch means operable to prevent the movable member moving.
The movable member may be coupled to the locking means by at least one intermediate member. Preferably the latch means acts directly on the or one of the intermediate members. The movable member may be directly coupled to a first intermediate member to cause the first intermediate member to move as the movable member moves. The first intermediate member may comprise first and second levers mounted on a common spindle, the movable member being coupled to the first lever and the locking means being coupled to the second lever. The coupling between the movable member and the first intermediate member may comprise a pin in the lever or member, and a slot or recess in the member or lever, respectively. Preferably the first intermediate member is directly coupled to a second intermediate member. The coupling may be by means of a pin slidable in a slot or recess. The locking means is preferably coupled directly to the second intermediate member. The second intermediate member may be pivotally mounted. The locking means may comprise a latch bar movable into and out of engagement with a corresponding formation on the second intermediate member.
The device may comprise manually operable means for releasing the locking means. The manually operable means may comprise a control member operable to move the latch bar. The control member may comprise a Bowden cable.
Preferably, when the locking means is engaged, the movable member is held in a position such tha
REFERENCES:
patent: 1396754 (1921-11-01), Hosking
patent: 1879630 (1932-09-01), Moody
patent: 4715483 (1987-12-01), Hobson et al.
patent: 4867282 (1989-09-01), Hartley
Oberleitner Robert J.
Rutherford Kevin D.
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