STORAGE APPARATUS
A carriage block body is coupled to a support shaft for relative rotation. The carriage block body defines a bearing hole receiving the support shaft. A carriage arm extends from the carriage block body along an imaginary plane perpendicular to the longitudinal axis of the support shaft. The carriage arm has a wall surface defining a cylindrical space at the tip end of the carriage arm. A projection is formed on the wall surface at a position off an intermediate plane set perpendicular to the longitudinal axis of the cylindrical space so that the cylindrical space is equally divided into a first cylindrical space and a second cylindrical space by the intermediate plane. The projection protrudes into the first cylindrical space.
1 . A storage apparatus comprising:
a carriage block body coupled to a support shaft for relative rotation, the carriage block body defining a bearing hole receiving the support shaft;
a carriage arm extending from the carriage block body along an imaginary plane perpendicular to a longitudinal axis of the support shaft, the carriage arm having a wall surface defining a cylindrical space at a tip end of the carriage arm; and
a projection formed on the wall surface at a position off an intermediate plane, the intermediate plane set perpendicular to a longitudinal axis of the cylindrical space so as to equally divide the cylindrical space into a first cylindrical space and a second cylindrical space, the projection protruding into the first cylindrical space.
2 . The storage apparatus according to claim 1 , wherein the projection is formed in an annular shape around the longitudinal axis of the cylindrical space.
3 . The storage apparatus according to claim 2 , further comprising an auxiliary projection formed on the wall surface at a position adjacent to the projection between the projection and an opening of the cylindrical space, the auxiliary projection protruding into the first cylindrical space.
4 . The storage apparatus according to claim 3 , wherein the auxiliary projection is formed in an annular shape around the longitudinal axis of the cylindrical space.
5 . The storage apparatus according to claim 4 , wherein an inner diameter of the auxiliary projection is set larger than an inner diameter of the projection.
6 . The storage apparatus according to claim 5 , further comprising a plate-shaped portion formed in the carriage arm, the plate-shaped portion having a further wall surface continuous with the wall surface, the further wall surface defining a third cylindrical space as an extension of the first cylindrical space.
7 . The storage apparatus according to claim 6 , wherein the plate-shaped portion is formed integral with the carriage arm.
8 . The storage apparatus according to claim 3 , further comprising a plate-shaped portion formed in the carriage arm, the plate-shaped portion having a further wall surface continuous with the wall surface, the further wall surface defining a third cylindrical space as an extension of the first cylindrical space.
9 . The storage apparatus according to claim 8 , wherein the plate-shaped portion is formed integral with the carriage arm.
10 . The storage apparatus according to claim 1 , further comprising an auxiliary projection formed on the wall surface at a position adjacent to the projection between the projection and an opening of the cylindrical space, the auxiliary projection protruding into the first cylindrical space.
11 . The storage apparatus according to claim 10 , further comprising a plate-shaped portion formed in the carriage arm, the plate-shaped portion having a further wall surface continuous with the wall surface, the further wall surface defining a third cylindrical space as an extension of the first cylindrical space.
12 . The storage apparatus according to claim 11 , wherein the plate-shaped portion is formed integral with the carriage arm.