| 摘要 |
An insert adapted to be positioned within an elongated channel member having a base portion and a pair of parallel sides, with the sides terminating in internally curled edges defining an open side forming a C-shaped channel, the insert having a width to be conformably received in said channel member either for longitudinal movement therein or to be positioned therein to receive the shank or axle of a caster or wheel, respectively. The insert may be either square in cross section and generally rectangular in shape or generally cylindrical with a pair of oppositely disposed grooves formed in the side surfaces of the insert to receive the curled edges of the channel member. The insert also may be provided with a body portion having a pair of oppositely disposed flanges extending from the body to form a generally rectangular outline, the insert being received in the channel member in a longitudinal manner. Each flange has an internally threaded opening therein to receive a bolt to either secure the insert in the member or to wedge the insert against the curled edges by the projecting ends of said bolts extending through the flanges to engage the channel member, and a central opening is provided to receive the shank of a caster or wheel axle. Also, the insert may be connected with an appropriate mechanical means to provide longitudinal movement within the channel member.
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