Height-adjustable handrest

摘要

A height-adjustable handrest has constituent components describe below. A middle bar element is inserted into a handrest external bar and has an internal space for containing a spring and an inner bar element. The handrest external bar is enclosed by a support unit with an upper end pivotally coupled to a press element. The press element has one end abutting against the inner bar element and has the other end protruding under an upward thrust from the spring. A pin passing through slots formed at the handrest external bar to penetrate oblong holes disposed at the inner bar element and the middle bar element, respectively. When pressed, the press element drives the inner bar element to move downward, thereby moving the pin upward along the inclined oblong hole of the inner bar element, compressing the spring downward, and moving the pin into a longitudinal channel of the handrest external bar.

主权项

1. A height-adjustable handrest, comprising:
a handrest external bar flanked by slots corresponding in position to each other and provided with a longitudinal channel disposed beside the slots; an inner bar element; a middle bar element inserted into the handrest external bar, wherein an upper end of the middle bar element dents downward to form a space of a predetermined depth for containing a spring and the inner bar element, a horizontal oblong hole is disposed at a lower portion of the middle bar element, and an inclined oblong hole is disposed at a lower portion of the inner bar element, allowing a pin passing through the slots formed at the handrest external bar to penetrate the horizontal oblong hole of the middle bar element and the inclined oblong hole of the inner bar element, such that the inner bar element keeps sticking out resiliently; a press element; and a support unit for enclosing the handrest external bar, the support unit having an upper end pivotally coupled to the press element in a manner to effectuate positional engagement between the support unit and the middle bar element, wherein the press element has an end abutting against an upper end of the inner bar element and has another end protruding under an upward thrust of the spring, and an upper end of the support unit is coupled to a handrest pad so as to form the height-adjustable handrest, wherein a user presses the press element to move the inner bar element downward, not only allowing the pin penetratingly disposed at the middle bar element to go up the inclined oblong hole of the inner bar element to therefore press down the spring, but also allowing the pin to exit the slots of the handrest external bar and retreat to the longitudinal channel beside the slots, such that the support unit coupled to an end of the middle bar element undergoes height adjustment as needed while being free from any restraint, wherein, after the height-adjustable handrest has been positioned in place at a predetermined height, the user releases the press element to move the inner bar element upward under a restoring force of the spring, and thus the pin penetratingly disposed at the lower portion of the inner bar element moves laterally into a corresponding one of the slots disposed at the handrest external bar, thereby allowing the height-adjustable handrest to be easily operated and precisely positioned in place at a predetermined height.