Mechanical actuating system
AssigneeGirling Limited
InventorAnthony Asquith
Life of this patent
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Abstract
In a mechanical actuator system a primary lever is angularly movable about a first pivot on a secondary lever through a first range to apply a force to an actuated member, and the actuating force is then transmitted to the actuated member through a higher leverage by the secondary lever which is angularly movable about a second pivot on a fixed part. The secondary lever is coupled to the actuated member by a one-way clutch, and the first pivot comprises a connection for a pawl which is engagable with ratchet teeth on the fixed part, at least when the clutch is engaged.
Claims14
A mechanical actuator system for applying an actuating force to an actuated member which is to be moved or to which pressure is to be applied comprising a primary lever, a secondary lever, a fixed part, a first pivot on said secondary lever about which said primary lever is movable by an actuating force through a first range until reaction to said actuating force attains a predetermined value, a second pivot on said fixed part about which said secondary lever is angularly movable with said primary lever through a second range into an applied position after said reaction attains said predetermined value whereby said actuating force is transmitted to said actuated member through a higher leverage, a one-way clutch for coupling said secondary lever to said actuated member through said second range, said clutch normally being disengaged but being engaged as said secondary lever is moved about said second pivot, ratchet teeth on said fixed part, and a pawl connected to said first and second levers by said first pivot and engageable with said ratchet teeth to hold said levers in said applied position at least when said clutch is engaged.
A hand-brake applying mechanism for a vehicle incorporating an actuated member for operating a brake comprising a primary lever, a secondary lever, a fixed part, a first pivot on said secondary lever about which said primary lever is movable by an actuating force through a first range to take up brake clearnaces until reaction to said actuating force attains a predetermined value, a second pivot on said fixed part about which said secondary lever is angularly movable with said primary lever through a second range into an applied position to apply the brake after said reaction attains said predetermined value whereby said actuating force is transmitted to said actuated member through a higher leverage, a one-way clutch for coupling said secondary lever to said actuated member through said second range, said clutch normally being disengaged but being engaged as said secondary lever is moved about said second pivot, ratchet teeth on said fixed part, and a pawl connected to said first and second levers by said first pivot and engageable with said ratchet teeth to hold said levers in said applied position at least when said clutch is engaged.
Dependencies are inferred from the claim text.