Simple structure analysis of the wrench head of ratchet wrench

Update:29-05-2020
Summary:

A manual screw tightening tool, single-end and double-e […]

A manual screw tightening tool, single-end and double-end multi-standard movable handle ratchet wrench (fixed hole). It is connected by the main plum blossom sleeve and the slave plum blossom sleeve of different specifications through the female key and the male key of the hinged key. Since a plum blossom sleeve has two sizes of plum-shaped through holes, it can be used for the tightening of two specifications of screws, thereby expanding the scope of use and saving raw materials and labor costs. The movable trigger can easily adjust the angle of use of the wrench. This wrench is used for the tightening operation of screws, and has the characteristics of strong applicability, convenient use and low cost.

Specialty ratchet wrench

A ratchet wrench for rotating a bolt or a nut placed in a narrow or hard-to-reach position, the ratchet wrench is rotatably connected to the end of the operating rod. The ratchet wrench includes: a weight connected to the operating lever, the weight can slide along the length direction of the operating lever, and the operating lever at the front of the weight has a front weight bearing portion that blocks the collision of the weight. Or, the operating lever at the rear of the weight has a rear weight bearing portion that blocks the collision of the weight. Moreover, the operating lever may also have both a front weight carrying part and a rear weight carrying part.

 

Simple structure analysis of the wrench head of ratchet wrench. The magical effect of the combination curve in the design of wrenches. When the screw connection structure is tightened, the surface subjected to external force adopts the structure of a regular hexagonal body, usually a hexagonal nut. In this way, when it is rotated by the torque, there are always several surfaces that are in contact with the force-applying surface of the wrench to maintain the effect of the torque, so that the rotating torque is applied to the screw pair to achieve the purpose of tightening the thread connection. The new structure uses the same principle, fully considers the use of combined curved surfaces to achieve the above functions, and also realizes the flexible operation of the ordinary ratchet mechanism.

 

The operator's arm is forced, and the wrench is moved forward until one side of the threaded coupling fits with the other section of the wrench head opening. In this way, the second and third paragraphs are closely attached, and the third paragraph is 30 with the horizontal line. The second segment is a vertical line. In this way, the two closely fitting segments form the role of a wedge, and the wrench head catches the workpiece. This makes it easy to enter and fit naturally, making it easy for the operator to perform the next operation easily and quickly. The second step is to pull the screw pair to give torque to the screw pair, so that the threaded connection is gradually tightened to the appropriate torque. The wrench rod rotates clockwise under the action of the human arm. Due to the gap between the two symmetry planes of the hexahedron, the threaded coupling is relatively stationary, and the wrench rotates around the coupling. During rotation, the hexagon nut rotates relatively around its center, its maximum The top corner should avoid the opening of the wrench, that is, the opening of the wrench head has a circular arc section avoiding the top corner. The vertical side and the hypotenuse of the middle are separated from each other, and the oblique side of the hexahedron is gradually parallel to the other oblique side of the wrench and fits. The right arc segment of the wrench is close and rotates relatively. Turning to a certain angle, the hexagon nut and the wrench have only three points of contact: the intersection of the two straight lines where the opening curve of the wrench intersects the right end of the arc and the point where the left end contacts and the three points of contact limit the rotation of the wrench and the coupling. That is, the positions of the two are fixed, and torque is continuously applied to the wrench rod, and the wrench transmits the torque to the hexagon nut, so that the threaded coupling can be gradually tightened.

 

Turning the thread pair to a certain angle requires the wrench to return to the optimal force application position. To achieve it also depends on the curve of the opening. The operator turns the wrench in the opposite direction, and the wrench rotates relative to the hex nut due to the frictional force of the hex nut's thread pair. In this way, there is no contact between the wrench and the threaded coupling, the wrench has a certain rotation space, the operator continues to apply reverse torque, the wrench rotates a certain angle relative to the hex nut, and turns to another symmetry plane of the nut to the state, slightly Push forward, the wrench and the coupling contact and clamp again. Then apply a tightening torque.

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