Caliber adjustable wrench

Abstract

The invention discloses a wrench with the adjustable caliber. The wrench comprises a wrench body capable of screwing bolts or nuts, and a hand shank connected with the wrench body. The wrench body comprises push rods, a base and a transmission mechanism for adjusting motion of the push rods. The vertical side of the base is provided with threaded holes in one-to-one correspondence with the push rods, the threaded holes are in threaded connection with the push rods, the transmission mechanism drives the push rods to rotate, and the push rods rotate forwards through cooperation with the threaded holes. According to the wrench, an adjusting screw rod is used for driving a rotary base plate to rotate, then the push rods are driven to move, the push rods can complete radial motion through restraint of the threaded holes on the push rods, the push rods rotate forwards along the threaded holes, a self-locking effect is achieved after a target is clamped, and slipping is not liable to occur; and large clamping force and screwing supporting force can be provided, so that damage, caused by excessively large screwing force, to a tool is reduced.

Description

technical field [0001] The invention relates to the field of wrenches, in particular to a wrench with adjustable caliber. Background technique [0002] A wrench is a commonly used installation and disassembly tool. It uses the principle of leverage to twist bolts, screws, nuts and other hand tools that are threaded to hold the opening or casing of the bolt or nut; the wrench is usually made at one or both ends of the handle. There are openings or sleeve holes for clamping bolts or nuts. When in use, an external force is applied to the shank along the direction of thread rotation to twist the bolts or nuts. Wrenches are usually divided into dead wrenches and live wrenches. Dead wrenches have openings of fixed size at one or both ends, which are used to twist nuts or bolts of a certain size; live wrenches have opening widths that can be adjusted within a certain size range. , can screw bolts or nuts of different specifications. [0003] In our daily life or in industrial des...

AI Technical Summary

Problems solved by technology

[0003] In our daily life or in industrial design, we need to install and disassemble bolts or nuts of different sizes and specifications. If we use dead wrenches, we need to have wrenches of different calibers, which are heavy to carry and inconvenient to use. Usually we The adjustable wrench used has a fixed jaw on one side and a movable jaw on one side. The movable jaw is moved through thread transmission to form jaws with different openings. However, when the adjustable wrench clamps the bolt or nut through the left and right sides, When turning in a certain direction, the force of the pressure is concentrated on the corners of the bolt or nut, which is easy to cause damage to the corners of the bolt or nut, such as the phenomenon of edging of the outer hexagon round head, etc.

[0004] Since the current polygonal bolts or nuts are generally positive hexagonal, so when addressing this phenomenon, people’s design targets are basically concentrated on hexagonal bolts or hexagonal nuts. The following is an example of hexagonal bolts; such as patent application No. 201210421085.1 A kind of multi-purpose wrench, the clamp head is controlled by six adjustable claw screws, so that the V-shaped grooves on the clamp head are respectively clamped on the six corners of the regular hexagonal bolts, which not only increases the force point, but also reduces the main force. The force point is transferred from the easy-to-damage corner to the non-damage surface, avoiding the edging phenomenon of the outer hexagon round head, etc. However, this design needs to adjust the six horn screws separately during the clamping process, which is not easy to control and time consuming

[0005] On this basis, the patent application number 201510746558.9 of the quick wrench with adjustable caliber size, through the control of the upper and lower pressure plates, the two pressure plates with an inner angle of 120° respectively clamp the two corners of the hexagonal bolts to form a four-dimensional In this case, when the wrench starts to twist the hexagonal bolt, there are four main force points, and the positions of the main force points are on the surface that is not easily damaged; a belt test with patent application number 201510620355.5 The wrench of the electric pen is clamped through the V-shaped opening in front of the slider, and the sliding is controlled by the adjusting bolt to clamp hexagonal bolts of different sizes; Mechanism devices slide horizontally when adjusting the caliber. The clamping force and the support force when twisting in the horizontal sliding way are relatively small. In some cases, the twisting will not move. When the clamping force or twisting force is large, it is easy to slip and even damage the corresponding transmission mechanism

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