Abstract: A tripod leg adjustment device including a protection cap having a body that is provided with three axially through slots spaced equally around the one circumference of the body, and three pairs of supporting slab with each pair of supporting slabs disposed abut each slot; a rotary disk that is pivotally mounted on the protection cap by an axially mounting means, the rotary disk having three protrusions extends through the three slots with each of the protrusion provided at its free end an inwardly inclined slope; leg sleeves, with each of the leg sleeve pivotally mounting on a pair of supporting slabs, wherein one end of the leg sleeve provided with a rounded portion and with at least two laterally disposed guiding slope portions in different inclining angles that are complementary to the inwardly inclined slope on the protrusion.

Abstract: A telescopic tube locking structure includes a telescopic tube including at least a upper tubular part and a lower tubular part; an eccentric camshaft having a lower portion fixed in the lower tubular part and a upper portion being inserted into the upper tubular part, and, an opening cam having a larger diameter than the upper portion of the eccentric camshaft is rotationally mounted on the eccentric shaft and is inserted in and engaged with the upper tubular part in a rotationally fixed manner such that the opening cam is axially movable along with the an eccentric camshaft in the upper tubular part and is rotationally fixed with the upper tubular part; wherein a central line of the opening cam is offset from a central line of the upper portion of the eccentric camshaft.

Abstract: A telescopic tube locking structure includes a telescopic tube including at least a upper tubular part and a lower tubular part; an eccentric camshaft having a lower portion fixed in the lower tubular part and a upper portion being inserted into the upper tubular part, and, an opening cam having a larger diameter than the upper portion of the eccentric camshaft is rotationally mounted on the eccentric shaft and is inserted in and engaged with the upper tubular part in a rotationally fixed manner such that the opening cam is axially movable along with the an eccentric camshaft in the upper tubular part and is rotationally fixed with the upper tubular part; wherein a central line of the opening cam is offset from a central line of the upper portion of the eccentric camshaft.

Abstract: A Head for a gun support apparatus is provided, which includes a body, a left arm assembly, a right arm assembly, and a blocking member. The left arm assembly is pivotally coupled to the body, and the right arm assembly is pivotally coupled to the body and is engaged to the left arm assembly so that they can be revolved simultaneously. The blocking member is engaged to both the left arm assembly and the right arm assembly to form a ratchet mechanism.