Wrench
AssigneeDaishowa Seiki Co., Ltd.
InventorsMasayuki Matsubara, Yasuhiko Kitamura
Life of this patent
Estimating the term…
Abstract
A wrench for tightening a tightening member to another member by revolving the tightening member around its axis, wherein the wrench comprises an inner surface which is attached to the outer surface of the tightening member. On the inner surface, a recess is provided to store a wedge member and is configured by a continuous formation of a slack area and a wedge area. The wedge member is configured to wedge between the outer surface of the tightening member and the wall of the wedge area when the wrench body is rotated in the one direction, in order to place the wedge member in the wedge area, whereby the wrench and the tightening member are unified regarding the relevant direction, enabling the rotation of the tightening member in the relevant direction through the wrench.
Claims13
A wrench for tightening a tightening member to another member by rotating the tightening member around its own axis, comprising:
- an inner surface to be attached to the outer surface of said tightening member;
- a wedge member arranged on said inner surface for wedging between the outer surface of the tightening member and said inner surface when said wrench is rotated in at least one direction;
- and
- a holding means provided on said inner surface to hold said wedge member, including:
- i) a recess with a circular-curved cross section formed on the inner surface of the wrench for receiving the wedge member, said recess including a slack portion for housing said wedge member in a non-wedging position, and wedging portions flanking said slack portion for extending said wedge member into a wedging position;
- ii) a retainer provided on the inner surface of the wrench for limiting the extent that said wedge member is extended into said wedging position, and
- iii) a pin-like stopper for preventing said wedge member from moving from said slack portion in the recess to one of said wedging portions.
A wrench for tightening a tightening member to another member by rotating the tightening member around its own axis, comprising:
- an inner surface to be attached to the outer surface of said tightening member;
- a wedge member arranged on said inner surface which is wedged between the outer surface of the tightening member and said inner surface by rotating the wrench body in one direction;
- and
- a holding means provided on said inner surface for holding said wedge member, including
- i) a recess with a circular-curved cross section formed on the inner surface of the wrench body for receiving the wedge member, said recess including a slack portion for housing said wedge member in a non-wedging position, and wedging portions flanking said slack portion for extending said wedge member into a wedging position;
- ii) an annular retainer arranged around the inner surface of the wrench for limiting the extent that the wedge member is extended into said wedging position, and
- iii) a bias means for biasing the retainer so that the wedge member is biased from the slack area towards the wedge area, said bias means including a ring-shaped spring corresponding to the shape of the retainer.
Dependencies are inferred from the claim text.