| 摘要 |
A scissors jack is adapted to be mounted permanently to the bottom frame of a vehicle and enclose the working members of the jack in the closed position. Generally, four of these scissors jacks will be mounted on the four opposite corners of the vehicle to level and stabilize the vehicle when the jacks are extended to their open position. The scissors jack has two opposed pairs of channel-shaped scissors arms. Each pair of arms is pivotally secured at a first end of the arms with the second ends having teeth formed therein. The upper arms of each pair are hingedly connected to a mounting member with their teeth intermeshed and the lower arms of each pair are hingedly connected to a baseplate with their teeth intermeshed. The second ends are mounted in the baseplate and mounting plate by rivets and each pair of rivets has a strap secured on the inside thereof to keep the teeth engaged and to relieve the stress on the rivets. A threaded rod is engaged through an internally threaded nut mounted at one pivot point of the scissors arms, a bushing is mounted at the second pivot point enabling the rod to be rotated to raise and lower the jack by opening and closing the scissors arms. The channel-shaped scissors arms are of a width and depth sufficient substantially to enclose the threaded rod when the jack is in the closed position to protect the threaded rod from debris thrown up during motion of the vehicle. The mounting member is a T-shaped member having channel-shaped arms to stabilize the jack. The T-shaped member and the baseplate have slots aligned with the teeth to allow the teeth to extend therethrough in the fully open position.
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