Telescopic hand tool

Abstract

A telescopic hand tool consists of a main body, a bar and a positioning device. The bar possesses an axial hole bored axially from its one end for engaging with a telescopic bar of the main body, and a sliding groove dug around its surface, bored with a ball hole. The positioning device includes a restricting knob, a compression spring and a restricting plate. The restricting knob can slide restrictively along within the sliding groove by means of a restricting block so as to let the main body move in the bar axially. The compression spring can push elastically the restricting knob back to its original position to press on a steel ball restricted in a restricting ball hole of the main body, keeping the main body locked restrictively in the bar.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a hand tool, particularly to one that can be adjusted telescopically and kept immovably by means of a knob able to re-position automatically.[0003]2. Description of the Prior Art[0004]Commonly, as shown in FIG. 1, a conventional telescopic hand tool 10 is composed of a main body 11, a bar 12, a controlling cover 13, a compression spring 14 and a C-shaped lock washer 15. The main body 11 is provided with plural restricting ball holes 111 bored axially with equidistance and a shallow groove 112 concaved to communicate with the restricting ball holes 111. The bar 12 is provided with a positioning hole 121 bored at its one end for a positioning ball 122 to stay on, and an annular slot 123 bored around a certain spot. The controlling cover 13 is provided with a controlling groove 131 and an accommodating groove 132 formed respectively on its inner wall of two opposite sides and spaced apart by a blo...

AI Technical Summary

Benefits of technology

[0006]The main characteristics of the invention are a main body, a bar and a positioning device. The bar is provided with an axial hole bored axially from its one end for engaging with a telescopic bar of the main body, and a sliding groove dug around its surface, bored with a ball hole. The positioning device is composed of a restricting knob, a compression spring and a restricting plate. The restricting knob can slide restrictively along the sliding groove by means of a restricting block so as to let the main body move in the bar axially. The compression spring can push elastically the restricting knob back to its original position to press on a steel ball constrained in a restricting ball hole of the main body, keeping the main body locked restrictively in the bar. Therefore, by means of the restricting block of the restricting knob keeping the steel ball in the restricting ball hole immovably, the main body is positioned precisely and stably in the bar. And, the compression spring can elastically push the restricting knob back to its original position to restrict the steel ball from moving. The restricting knob can be just operated to move right or left by a finger for adjusting the length of the main body, conforming with requirements of humanization and simplification.

Problems solved by technology

But, it is so inconvenient that the controlling cover 13 has to be continuously dragged axially while adjusting the length of the main body 11.

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