| CPC F16D 65/0043 (2013.01) [B25B 27/0035 (2013.01)] | 10 Claims |
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1. A disc brake piston retraction tool, comprising:
a reversible ratchet wrench including an operating handle and a ratchet wheel located at a force output end of the operating handle, a first force output shaft and a second force output shaft being disposed on two sides of a center of the ratchet wheel and extending out of two sides of the force output end of the operating handle, a surface of the first force output shaft being formed with a first external thread, a surface of the second force output shaft being formed with a second external thread, the first external thread and the second external thread being in different helical directions;
a first pressure plate assembly including a first pressure plate, a first nut, a first sleeve unit, and a first restraining member; the first pressure plate having an outer surface and an inner surface; the first nut being fixed to the inner surface of the first pressure plate relative to the first force output shaft, the first nut having a first internal screw hole screwed with the first external thread; the first sleeve unit being made of an elastic material and sleeved on an outer surface of the first nut, a front edge of one end of the first sleeve unit having a plurality of first L-shaped elastic plates that are arranged around the first internal screw hole and extend toward the surface of the first force output shaft, the first L-shaped elastic plates each having a first engaging piece corresponding to the first external thread, the first engaging piece being engagable in a root of the first external thread, the first engaging piece having a width not more than 4 times a pitch of the first external thread, the first engaging piece having a thickness less than half of the pitch of the first external thread, the first engaging piece being configured to jump along the first external thread to generate a pressing force; the first restraining member being sleeved on a surface of the first sleeve unit for restraining the first sleeve unit on the first nut; and
a second pressure plate assembly including a second pressure plate, a second nut, a second sleeve unit, and a second restraining member; the second pressure plate having an outer surface and an inner surface; the second nut being fixed to the inner surface of the second pressure plate relative to the second force output shaft, the second nut having a second internal screw hole screwed with the second external thread; the second sleeve unit being made of an elastic material and sleeved on an outer surface of the second nut, a front edge of one end of the second sleeve unit having a plurality of second L-shaped elastic plates that are arranged around the second internal screw hole and extend toward the surface of the second force output shaft, the second L-shaped elastic plates each having a second engaging piece corresponding to the second external thread, the second engaging piece being engagable in a root of the second external thread, the second engaging piece having a width not more than 4 times a pitch of the second external thread, the second engaging piece having a thickness less than half of the pitch of the second external thread, the second engaging piece being configured to jump along the second external thread to generate a pressing force, the second restraining member being sleeved on a surface of the second sleeve unit for restraining the second sleeve unit on the second nut.
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