| 摘要 |
a bearing inserted in the shaft holes of supporting shaft tubes (2)(2a) mounted to the case; rotating shafts (3a)(3b) of a rotating case (3) a rotating gear (7) mounted on the case (3) and meshed with a driving gear (21) of a driving shaft (20); bevel gears (5)(6) oppositely fixed so that a bevel gear rotating shaft (4) mounts vertically to the shaft of the case (3); the bevel gears are meshed with inner bevel gear (8) of a folowing shaft (9) and inner bevel gear (10) of a brake shaft (11) ; a friction bearing (22) mounted between the shaft (11) and fixing shaft rod (22); a coil spring (15) mounted between brake disc (14) and pressure disc (16); a pressure gear (18) movable along a screw hole (17) and rotatable by a manual screw hole (19) .
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