Abstract: A jack is provided which includes a vertical lift rod which is disposed within a tubular housing and has a male thread formed on its longitudinal body. Two guide blocks are included with each having a recess with a half female thread formed therein, the two blocks together forming a complete female thread to engage or disengage from the male thread of the lift rod. The lift rod can be lifted up by its rotation within the female thread, when the lift rod is rotated by a handle connected with a worm engaging a worm gear. The worm gear has two keys formed on its inner wall for receipt within two respective longitudinal slots of the lift rod for engagement thereof. The lift rod can be rapidly lowered by displacement of the two guide blocks away from engagement with the lift rod. A rack and pinion arrangement is provided for displacement of the guide blocks responsive to rotation of a handle coupled to the pinion.

Abstract: A securing base having a round base of three layers to support a pressing disc combined with a supporter, a shaft passing throught the pressing disc to engage the round base by means of threads, a ball at a bottom of a movable rod fitting in a spherical hole in an upper portion of the movable rod, the ball having a plurality of small holes for a pin end of the supporter to selectable in an angle needed.

Abstract: An angle-adjustable joint consisting of a male joint and a female joint combined together with a pivotal pin, the male joint being rotated in its angle for a wide scope in relating to the female joint and then locked at any angle by a push rod extending in a lateral hole in the female joint and being pushed to locate in a locking position to engage any set of locating teeth around a round end of the male joint, the push rod being pushed most inward to an unlocking position to disengage from the set of locating teeth to free the male joint in relation to the female joint.

Abstract: A collapsible tent frame having two side frames connected with three lengthwise connecting tubes and four lengthwise locating tubes, each side frame consisting of two sloping-down top tubes connected with an angle-adjustable joint, two intermediate tubes connected with a one-direction adjustable joint to keep an upper tube sloping down and a lower tube upright and two leg tubes respectively connected with an upright tube of the intermediate tubes, which is connected with one of the sloping-down tubes, each leg tube having a caster to stand and move on the ground, the caster having a fixing pedal for securing it on something to keep it immovable.

Abstract: A collapsible recuperating walker having a seat frame, a standing frame, collapsing units and two brake units. Each collapsible unit consisting of bendable tube joints connected in intermediate portions of upper horizontal tubes and lower horizontal tubes of the seat frame and the standing frame. The collapsible units are capable of being folded so as to make the recuperating walker collapsible to a smaller dimension for transportation or storage. The brake units are used to break the casters and are provided below the standing frame.

Abstract: A collapsible tent frame has two pole position bases and a plurality of reverse U-shaped frame units to combine with the pole position bases to support a tent roof cloth. Each frame unit consists of two main frame poles having their lower ends screwed with the position bases to stand in radiant direction, and a vertical extension pole connected with a main frame pole at one end and with a horizontal extension pole at the other end with a collapsible hinge to form a reverse U-shaped frame unit. After all frame units are assembled with the position bases, two position ropes can be inserted through each frame unit firmly to keep all the frame units spaced apart from each other at a proper distance. Two sustaining bases are provided to sustain the outer-most frame unit pulled upward to form an entrance for this tent.