| 摘要 |
A block includes first and second through holes extending from an upper side thereof through a lower side thereof. A necking passage section is defined between and thus communicates with the first and second through holes. A lower end of the first through hole coincides with the lower end of the second through hole. The first through hole has a central axis which is at an angle to that of the second through hole. The first through hole has a diameter the same as that of a rod to which the block is mounted. The upper end of the second through hole has a diameter greater than that of the rod and tapers to the lower end of the second through hole which coincides with the lower end of the first through hole. The necking passage section is resilient to allow the rod to be forcibly moved between the first and second through holes. An antislip member is provided to an inner periphery of the first through hole. The rod is retained in position when it is received in the first through hole. When the rod is received in the second through hole, the block is slidable along the rod.
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