SU373139A1 - WRENCH - Google Patents

Description

one

The invention relates to hand assembling tools and is intended for tightening fasteners, preferably detachable plastic connections.

A wrench is known, comprising a handle carrying a fixed jaw in which a through hole is made, a movable jaw with working faces under the nut, forming an angle of 120 °, and a threaded rod, and connecting the movable and fixed jaw made in the form of a nut. with a spherical surface placed in the hole of a fixed sponge.

A disadvantage of the known key is a high concentration of april at the points of contact between the jaws and the nut, which cause deformation of the edges of the latter, slipping of the key and damage to the nut. When the wrench is removed from the nut, it is possible to turn the nut in the opposite direction, which reduces the strength of the joint.

The reduction of the contact stresses and voltages of bending in the edges of the fastening element is achieved by the fact that the key is provided with an additional sponge mounted for movement along the rod of the movable sponge and having a working gravel forming an angle of 15-30 ° with the edge of the movable sponge nearest to the rod , and the fixed sponge is made with two working edges, which are curved surfaces. The movable sponge is provided with a handle bent relative to the axis of the sharpira Hia angle of 30-40 °.

FIG. 1 schematically shows a general view of the key, side and top view; in fig. 2 is a section along A-A in FIG. one; in fig. 3 schematically shows the key head.

The key contains a movable sponge 1, the working faces of which Pi and 2 are made at an angle of 120 °, the handle 2 with a fixed sponge 3, the working faces of which RZ and Pi are made on curved surfaces. This is because the sponge 3 swings around the joint 4, mounted on a threaded rod 5, which is provided with a movable jaw /, made in the form of a spherical nut, which serves to adjust the key to the specified size.

An additional sponge 6 with a working RZ edge, which forms an angle of 15-30 ° with the PZ face, is mounted on the movable sponge rod with an optional longitudinal movement. The movable sponge is provided with a handle 7, bent relative to the axis of the hinge at an angle of 30-40 °.

The edges of the jaws, the hinge and handles form a system of levers with a constant ratio of shoulders during an operating cycle and with a variable ratio of shoulders when setting the key to

hexagon size. This ensures the reduction of contact n: anneals and bending stresses in the edges (which is very important when screwing plastic joints) by increasing the contact surface of the face of the nut with movable jaws (main and additional) in areas whose length is not less than half of each three sides of the nut in contact with the edges of these sponges.

The bending of the additional handle allows for the wounding of the cotton and the release of the screwed nut without turning the key and eliminating the reverse rotation of the screwed nut.

Subject invention

Claims (2)

1. A wrench, mainly for detachable plastic joints, containing a handle, a non-drying fixed jaw in which a through hole is made, a movable jaw with working faces 1and a nut, forming an angle of 120 °, and a threaded screw, and a connecting movable and a fixed jaw hinge, made in the form of a nut with a spherical surface placed in the hole, a fixed jaw, characterized in that, in order to reduce contact stresses and bending stresses in the edges of the fixing element, provided with an additional sponge mounted for movement along the rod of the movable sponge and having a working face, which forms with the pancake: the edge of the movable sponge with the edge of the movable sponge to the rod 15-30 °, and the stationary sponge is outward-aligned with two working faces, which are curvilinear surfaces. 2. A key according to claim 1, characterized in that the movable sponge is provided with a handle bent relative to the axis of the hinge at an angle of 30-40 °. 15 S Aa Fig.Z