Hydraulic brake mechanism |
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| 申请号 | US3739579D | 申请日 | 1971-07-26 | 公开(公告)号 | US3739579A | 公开(公告)日 | 1973-06-19 |
| 申请人 | LUTZ R; | 发明人 | LUTZ R; | ||||
| 摘要 | A hydraulic system actuator including a lever and structure defining a fulcrum for the lever and a link attached to the lever for actuating a pressure cylinder. The fulcrum of the lever is shifted relative to the lever in response to changing pressure within the hydraulic system created by rotation of the lever. The movement of the fulcrum increases the mechanical advantage of the lever as it approaches the end of its travel. The actuator has particular adaptability to vehicular brake systems. | ||||||
| 权利要求 | 1. An actuating mechanism for a hydraulic system, which system includes a fluid pressurizing device comprising: a lever arm; fulcrum means for defining a fulcrum axis about which the lever arm is adapted to rotate; means responsive to rotation of the lever arm for shifting the position of the fulcrum axis relative to the lever arm between first and second positions to change the mechanican advantage of the lever arm; and means mounted wherein the means for shifting the fulcrum axis includes a fluid motor on the lever arm for actuating the fluid pressurizing device in said first and second positions of said fulcrum axis 2. An actuating mechanism for a hydraulic system, which system includes a fluid pressurizing device comprising: a lever arm including: a first member, and a second member; fulcrum means for defining a fulcrum axis about which the lever arm is adapted to rotate including: first pivot means for pivotally mounting the first member, and second pivot means for pivotally mounting the second member to the first member; and means responsive to rotation of the lever arm for shifting the position of the fulcrum axis relative to the lever arm between said first and second pivot means to change the mechanical advantage of the lever arm, said means for shifting the fulcrum point including: means for precluding rotation in one direction of the first member about the first pivot means to enable rotation of the second member about the second pivot means, and means mounted on the lever arm for actuating the fluid pressurizing device. 3. A mechanism according to claim 2 wherein the lever arm includes yieldable means for preventing any substantial rotation of the second member about the second pivot means in at least one direction until rotation of the first member in said one direction is precluded. 4. A mechanism according to claim 2 wherein the rotation precluding means comprises: a fluid motor having a reciprocal rod; a wedge disposed on the rod; a wedge block; and a surface on the wedge block and a surface on the first member adapted to cooperate with the wedge to preclude rotation of the first member in said one direction. 5. A fluid system comprising: means for pressurizing fluid; a lever arm; fulcrum means for defining a fulcrum axis about which the lever arm is adapted to rotate; means mounted on the lever arm for actuating the fluid pressurizing device upon rotation of said lever arm about said fulcrum axis; and means in part responsive to pressure within the system developed by the pressurizing means for shifting the position of the fulcrum axis relative to the lever arm during its rotation and the actuation of said fluid pressurizing device to change the mechanical advantage of the lever arm wherein the means for shifting the fulcrum includes a fluid motor. 6. The system according to claim 5 wherein: the lever arm includes: a first member, and a second member; the fulcrum includes: FIRST pivot means for pivotally mounting the first member, and second pivot means for pivotally mounting the second member to the first member; and the means for shifting the fulcrum point includes: means for precluding rotation in one direction of the first member about the first pivot means to enable rotation of the second member about the second pivot means. 7. A system according to claim 6 wherein the lever arm additionally includes yieldable means for preventing rotation of the second member about the second pivot means in at least one direction until rotation of the first member is precluded. 8. A system according to claim 6 wherein the rotation precluding means comprises: a fluid motor having a reciprocal rod; a wedge disposed on the rod; a wedge block; and a surface on the wedge block and a surface on the first member adapted to cooperate with the wedge to preclude rotation of the first member in said one direction. |
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