Patent Application
20050040379
(a) Field of the Invention
The present invention relates to jacks having a detachable rear-end handle, more particularly to a wheeled jack having a hand-held ring connected to the screw nuts of the rear shaft for facilitating transporting the jack and adjusting the supporting plate thereof to a proper lift point.
(b) Description of the Prior Art
The wheeled jacks of the prior art do not have a handle or a hand-held ring for a portable transportation. To carry a wheeled jack, it is therefore necessary to put the jack in a hand-held bag or a box. It is an alternative that some wheeled jacks are provided with a hand-held ring connected to the outer walls of the sidewalls at a middle shaft. Since the jack extends horizontally when being lifted, it tends to waver about a horizontal plane, which leads to unexpectedly collisions with surrounding objects. It is a further disadvantage that a hand-held ring on the middle section of the sidewalls cannot assist pushing the jack toward a selected lift point under a huge object such as a vehicle.
Accordingly, the primary objective of the present invention is to provide a jack having a detachable rear-end handle, wherein, on each side of the rear portion of the sidewalls, two blocking pieces are each mounted on an upper location and a lower location close to the screw nut of a rear shaft. Those blocking pieces are for restricting the rotation of a hand-held ring. Since the hand-held ring is connected to the rear end of the jack, the jack is in a vertical configuration when being lifted, so as to avoid collisions between the jack and surrounding objects. When lying on the ground, the rear-end handle can be used to control the horizontal movement of the jack so as to aim the supporting plate of the jack at a selected lift point on the bottom of a vehicle.
The secondary objective of the present invention is to provide a jack having a detachable rear-end handle, wherein the blocking pieces about the screw nuts of the rear shaft of the sidewalls can be a pair of pins, a pair of bulged objects, an integrally punch-formed plate or any other configurations capable of restricting the rotation of the hand-held ring.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings.
Referring to
The hand-held ring 2 is a handle bar with two perpendicularly extended arms respectively at two ends thereof. Each arm has an encircling hole 21 at the free end thereof. The encircling holes 21 are respectively engaged with corresponding screw nuts of a rear shaft 12, as shown in
Referring to
The above-mentioned hand-held ring 2 is preferably made of flexible materials such as plastics, for that two lateral arms of the hand-held ring 2 can be properly extended outwardly to put the encircling holes 21 around the screw nuts of a rear shaft 12. To take the hand-held ring 2 off the jack 1, the lateral arms of the hand-held ring 2 are again extended so that the encircling holes 21 are decoupled from the screw nuts of a rear shaft 12.
According to the present invention, besides a pair of pins and a pair of bulged objects, the upper and lower blocking pieces 13 may also be embodied in a single plate punch-formed on each of the sidewalls 11 of the jack 1, as shown in Fgi. 6. The plate replaces the upper and lower blocking pieces 13 to restrict the rotation of the hand-held ring 2. The present invention is thus described, and it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
