Importance

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Abstract

A clutch actuating system which is particularly suitable for connecting drive to the front wheels of a four-wheel-drive tractor. The system includes an actuating member movable between a first position in which the clutch is disengaged and a second position in which the clutch is engaged. A pair of adjacent reaction members (27,29) encircle the actuating member and have mutually inclined wedging surfaces (30,31) on confronting faces. One (27) of the reaction members is connected with the clutch (25,26) which is of the toothed-dog type. A number of elongated toggle members (33) are connected at one end with the actuating member (32) and extend between the wedging surfaces of the reaction members at their other ends. Movement of the actuating member from its first to its second position causes the toggle members to execute a toggle action and to be forced further between the wedging surfaces (30,31) to separate the reaction members (27,29) to engage the clutch and cause the toggle members to assume a stable position in which the actuating member is held in its second position by the toggle members thus holding the clutch engaged. The teeth (25,26) of the clutch may be angled on co-operating surfaces to provide a separation force which tends to disengage the teeth to facilitate disengagement of the clutch.

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First Claim