A two-way variable speed screwdriver

Abstract

The invention provides a bi-directional speed changing screw driver. The bi-directional speed changing screw driver comprises a free handle, a sleeve screw head, a screw driver rod and a bi-directional speed changing device. The screw driver rod is a bi-directional screw driver rod. The screw driver rod comprises a screw driver rod A and a screw driver rod B. The screw driver rod A and the screw driver rod B are connected with the left end and the right end of the bi-directional speed changing device respectively. The tail ends of the screw driver rod A and the screw driver rod B are provided with hexagon connecting ends. The center of the free handle is provided with a long blind hole. The bottom end of the long blind hole is a hexagon blind hole which is matched with the hexagon connecting end of the screw driver rod A or the hexagon connecting end of the screw driver rod B. The sleeve screw head comprises a screw driver head and a sleeve. According to the bi-directional speed changing screw driver, the size is small, the weight is low, the cost is low, control is easy to carry out, the feedback is direct, a fastener thread is not easily damaged, the working efficiency is higher under a rapid mode, and rotating and reversing of the driver head can be achieved without extra switching action. The bi-directional speed changing screw driver can be matched with a ratchet mechanism of a ratchet wheel screw driver for using, and has the characteristics of the ratchet wheel screw driver, and therefore the working efficiency is further improved.

Description

technical field [0001] The utility model relates to a tool, in particular to a two-way variable speed screwdriver. Background technique [0002] (1) Nowadays, electric screwdrivers are very popular, which greatly improves the operation efficiency of screw fastening. However, the current electric screwdriver products on the market still have the following deficiencies: [0003] 1. The volume is too large, it is difficult to use in a small space; [0004] 2. The weight is heavy, and the user is prone to fatigue when holding it for a long time; [0005] 3. The price is much higher than traditional screwdrivers; [0006] 4. Most of the torque control is still achieved by pressing the limit switch. This control method is completely dependent on the user's hand feeling. It is difficult to operate in practice. If you are not careful, it is easy to damage soft tights such as plastics due to excessive output torque. firmware threads; [0007] 5. A small number of products us...

AI Technical Summary

Problems solved by technology

[0003] 1. The volume is too large, it is difficult to use in a small space;

[0004] 2. The weight is heavy, and the user is prone to fatigue when holding it for a long time;

[0006] 4. Most of the torque control is still achieved by pressing the limit switch. This control method is completely dependent on the user's hand feeling. It is difficult to operate in practice. If you are not careful, it is easy to damage soft tights such as plastics due to excessive output torque. firmware threads;

[0007] 5. A small number of products use the friction-slip torque control design, which solves the problem of the controllability of the upper torque limit, but the cost is very high, often five or six times that of ordinary electric products

[0009] 1. The ratchet screwdriver only speeds up the return action of the handle, and the improvement of efficiency is very limited; the knife rod of the ratchet screwdriver and the handle reciprocating drive screwdriver both rotate in one direction. If you need to change the direction, you need to manually operate the reversing device once. It is very cumbersome for occasions where reciprocating rotation is required to finely adjust the screw tightening torque and pressure;

[0010] 2. The "double speed" handle reciprocatingly drives the screwdriver. The reciprocating rotation of the handle of the screwdriver can drive the directional rotation of the knife rod. This method of use is quite different from the traditional screwdriver. Users need to change their old habits. Always in a state of tension, without alternation of relaxation and relaxation, which does not match the rhythm of human physiological breathing force, and is prone to discomfort and fatigue; and due to the loss of mechanical transmission efficiency, the torque of the handle will be significantly different when rotating forward and reverse, which also affects The operator has control over the force

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