Patent Application
20240149408
The present invention relates to a hand tool and more particularly to a hand tool with an angle adjusting mechanism, in which an angle between a handle and a head member pivoted on the handle is adjustable.
A conventional ratchet wrench with angle adjusting mechanism has a handle and a driving head provided with a toothed protrusion. The handle has a forked end to receive the protrusion, wherein the head and the handle are hinged about a bolt therethrough. Between the tines of the fork is also disposed a gear having two different size diameters. This gear is provided on the shaft of a button which is spring loaded. In the normal position the large gear engages with the teeth of the protrusion on the head and the smaller gear engages with an inwardly toothed section of one tine of the fork such that the wrench head and handle are held rigid. When the button is depressed, the smaller gear disengages from the handle and the wrench head and handle are free to rotate with respect to each other. When the button is released, the spring loaded returns the gear to the normal position and the handle is fixed again.
However, the gear may not be completely engaged with and completely disengaged from the teeth of the driving head such that the rotational movement of the driving head may not be easily operated. In addition, a number of parts and elements are required and may not be easily assembled.
The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional wrench.
The main objective of the present invention is to provide an improved hand tool.
To achieve the objective, a hand tool comprises a handle, a driving head, an engaging assembly and a button. The handle has two pivot ears at one end thereof, a receiving groove defined between the two pivot ears, a transverse hole defined in one lateral side of the handle, and a longitudinal hole defined in a bottom of the receiving groove and in communication with the transverse hole. The driving head has a connecting portion received in the receiving groove of the handle, and a pivot shaft connecting the driving head to the two pivot ears of the handle. The connecting portion has a plurality of teeth at an outer periphery thereof and arranged in an arc. The engaging assembly is disposed in the longitudinal hole of the handle, and has an engaging member and a spring interposed between a bottom of the longitudinal hole and the engaging member. The engaging member has an engaging tooth at a top thereof for engagement with the teeth of the driving head, and has an arc-shape pushing groove defined in a lateral side of the engaging member and corresponding to the transverse hole of the handle. The arc-shape pushing groove has an arc-shape wall thereof, the arc-shape wall of the engaging member is concaved toward the direction of the spring from the lateral side of the engaging member. The button is movably disposed in the transverse hole of the handle, and has an abutting portion slidably inserted in the arc-shape pushing groove of the engaging member, the abutting portion of the button has an arc-shape plane abutting against the arc-shape wall of the engaging member such that horizontal movement of the button drives the engaging member to move longitudinally along the longitudinal hole of the handle, when the button is pushed toward the engaging member, the engaging member moves to compress the spring in the longitudinal hole of the handle and the engaging tooth of the engaging member is lowered to be disengaged from the teeth of the engaging member.
Preferably, each of the teeth of the connecting portion of the driving head and the engaging tooth of the engaging member are substantially rectangular-shaped.
Preferably, the radian of the arc-shape wall of the engaging member is greater than the radian of the arc-shape plane of the abutting portion.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
Referring to
As shown in
The arc-shape structure of the arc-shape pushing groove 34, arc-shape wall 341, and arc-shape plane 42 makes the operation of pushing the button 4 toward the engaging member 32 smoother.
As shown in
Furthermore, the radian of the arc-shape wall 341 of the engaging member 32 is greater than the radian of the arc-shape plane 42 of the abutting portion 41.
The detail descriptions of the operation are shown as following. Generally, the spring 31 abuts against the engaging member 32 toward the driving head 2 such that the engaging tooth 33 of the engaging member 32 is engaged with the teeth 23 of the connecting portion 21 to secure the driving head 2, as shown in
Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the invention as hereinafter claimed.
