CN2518648Y - Improved wrench - Google Patents

Abstract

An improved wrench has a handle portion extending from a body, a fixed jaw projecting from an end of the body opposite to the handle portion and a movable jaw slidable relative to the fixed jaw, and a receiving hole in the body, a worm engaged with a rack of the movable jaw and in the form of a multi-thread worm having a plurality of spaced and parallel spiral lines on the worm to increase the lead of the worm to enable the movable jaw to be moved rapidly when the worm is rotated.

Description

Improved Wrench

1. Technical field

The utility model relates to a hand tool, in particular to an improved wrench which can quickly adjust movable jaws to clamp or loosen workpieces.

2. Background technology

As shown in Figure 9 and Figure 10, it is a conventional adjustable wrench, which has a body 8, which has a handle 81, and the body 8 has a fixed jaw 82 at one end opposite to the handle 81, and has a fixed jaw 82 at this end. An adjustment hole 83 runs through the body 8 . A worm 84 is arranged at the center of the adjustment hole 83, and a spring 841 is provided between the top edge of the worm 84 and the adjustment hole 83 to maintain the positioning of the worm 2, and there is a chute 87 running through the body 8 outside the adjustment hole 83. The chute 87 is for a rack 86 of a movable jaw 85 to be embedded, and the rack 86 is engaged with the worm 84 .

Since the length of the worm 84 is not easy to increase, in order to make the worm 84 mesh with a plurality of teeth of the rack 86, a larger friction surface is generated. Therefore, the worm screw 84 is usually designed as a single-thread worm (single-thread worm) form that is easy to process and has a small lead. The movable jaw 85 produces sufficient reaction supporting force; however, the lead p of the worm screw 84 is small, and when the worm screw 84 is rotated to adjust the position of the movable jaw 85, it is time-consuming and cannot quickly adjust the movable jaw 85 to clamp or loosen the workpiece.

If in order to quickly adjust the movable jaw 85 to clamp or loosen the workpiece, the lead of the worm 84 is increased in the form of p1 as shown in Figure 12, then the number of teeth meshed between the worm 84 and the rack 86 will be reduced, so that it cannot Sufficient reactive support force is produced on the movable jaw 85.

Referring to Fig. 13 and Fig. 14 again, it is a conventional adjustable wrench 9 that can be adjusted quickly. 93 interlocking two pulleys 94,95, and the pulley 94 is connected with a gear 96 meshed with the tooth portion 911 of the worm 91. By pushing the push button 931 connected to the toothed belt 93, when the toothed belt 93 is displaced, the gear 96 drives the worm 91 to rotate quickly, so that the movable jaw 97 can be quickly adjusted, and the clamping or loosening position is fixed. The workpiece between the jaws 98.

Although the aforementioned adjustable wrench that can be adjusted quickly can achieve the purpose of quick adjustment by making the worm rotate quickly, it needs to add multiple parts, which makes the structure quite complicated, and will increase the difficulty and cost of manufacturing; In addition to the above-mentioned structure, the current improved structure to enable the movable jaw to quickly adjust the clamping or loosening of the workpiece is nothing more than a ratchet mechanism or a displacement mechanism that is added with the worm to achieve the effect of quickly moving the movable jaw. However, additional components must be added to make the structure more complicated and the manufacturing cost higher.

In addition to the above-mentioned designs such as adding a ratchet mechanism or a displacement mechanism, there are also a few patents that improve the design of the worm part. Please refer to Fig. 15 and Fig. 16, it is the structure of U.S. No. 953346 patent case, and it is that the helix 711 part on the worm screw 71 of adjustable wrench 7 is designed into the interrupted form, makes two axial extensions be formed on the worm screw 71 without Groove-shaped breaks 712 of the helix. The width of the interrupted portion 712 is slightly larger than the width of the rack 721 of the movable jaw 72 , so that the movable jaw 72 can be moved quickly when the worm 71 rotates until the interrupted portion 712 corresponds to the rack 721 of the movable jaw 72 .

However, in the above-mentioned design, the worm 71 needs to be processed again so that the helix 711 on the worm 71 has an interrupted portion 712, which increases the difficulty and cost of manufacture. Moreover, the strength of the helix 711 on the worm 71 will thus Weaken, the supporting force to the movable jaw 72 is reduced, and in adjustment, because the interrupted part 712 cannot mesh with the rack 721 of the movable jaw 72, it will cause the problem that the adjustment is not easy.

All in all, all the current improved structures to enable the movable jaw to quickly adjust the clamping or loosening of the workpiece, whether it is to cooperate with the worm to add a ratchet mechanism or a displacement mechanism, or to design the helical part on the worm in an interrupted form, have Problems such as difficult manufacture, increased cost, and difficult adjustment are necessary. Therefore, it is necessary to design a wrench that is simple in structure and easy to manufacture so as to quickly adjust the movable jaw to clamp or loosen the workpiece.

3. Contents of the invention

The main purpose of this utility model is to provide an improved wrench in order to solve the problems existing in the above-mentioned conventional wrench. By making the worm into the form of a multi-threaded worm, the lead of the worm is improved, and the worm and the movable jaw The meshing form of multiple teeth can be maintained between the racks to generate a larger friction area, thereby improving the resistance to the reaction force, and the tooth thickness of the worm can be increased to enhance the strength of the worm without adding additional components. , to achieve the double effect of directly and quickly moving the movable jaw to clamp or loosen the workpiece and to increase the reactive support force on the movable jaw.

Another object of the present invention is to provide an improved wrench, which does not add additional components, but directly manufactures the worm into a multi-threaded worm, making the manufacture easier.

Another purpose of the present utility model is to provide an improved wrench. The handle is provided with a groove, and the groove extends to the accommodating hole for the worm, so that the angle of turning the worm can be increased. , to increase the moving speed of the worm to adjust the movable jaw.

The purpose of this utility model is achieved by the following technical solutions.

An improved wrench comprising a body extending from a handle and protruding from the body at an end opposite to the handle with a fixed jaw, the body having a chute for setting a movable jaw having A rack, by which the rack is embedded in the chute; it is characterized in that the body has an accommodating hole, the accommodating hole communicates with the chute, and a A worm in which the racks of the jaws engage, which is in the form of a multi-flight worm having a plurality of spaced and parallel helices on the worm.

The purpose of this utility model can also be further realized by the following technical measures.

The aforementioned improved wrench, wherein the worm is in the form of a double-thread worm, and the lead of the worm is twice that of a general single-thread worm.

In the aforementioned improved wrench, the worm is in the form of a triple-thread worm, and the lead of the worm is three times that of a general single-thread worm.

The aforementioned improved wrench, wherein the worm is in the form of a triple-thread worm, and the lead of the worm is twice that of a general single-thread worm.

The aforementioned improved wrench, wherein the cross-section of the handle is roughly H-shaped, and the handle has a groove extending along the handle, the width of the groove is about the same as the length of the accommodating hole, and the groove extends to at the receiving hole.

The utility model can directly and quickly move the movable jaw to clamp or loosen the workpiece and can increase the dual effect of generating a reaction supporting force on the movable jaw, making the manufacture easier, and can increase the moving speed of the worm to adjust the movable jaw.

4. Description of drawings

Fig. 1 is a schematic perspective view of the appearance of the utility model.

Fig. 2 is a partial sectional view of the utility model.

Fig. 3 is a schematic plan view of the worm of the present invention.

Figure 4 is a graph showing the relationship between the lead and lead angle of the worm.

Fig. 5 is a schematic diagram of the use state of the dialing worm of the utility model.

Fig. 6 is a schematic diagram of the use state of turning the general worm.

Fig. 7 is a schematic plan view of the utility model worm designed as a three-thread worm.

Fig. 8 is a schematic plan view of another three-thread worm designed as the worm of the utility model.

Fig. 9 is a schematic diagram of the appearance of a conventional adjustable wrench.

Fig. 10 is a partial sectional view of a conventional adjustable wrench.

Fig. 11 is a plan view of the worm of a conventional adjustable wrench.

Fig. 12 is a schematic plan view of a long-lead worm.

Fig. 13 is a schematic diagram of the appearance of a conventional quick-adjustable adjustable wrench.

Fig. 14 is a sectional view of a conventional quick-adjustable adjustable wrench.

Fig. 15 is a schematic view of the appearance of another conventional adjustable wrench.

Fig. 16 is a sectional view taken along line 16-16 shown in Fig. 15 .

5. Specific implementation

1 to 4, the improved wrench of this embodiment, as shown in FIG. There is a fixed jaw 12, the body 1 has a chute 13 for setting a movable jaw 14, the movable jaw 14 has a rack 15, and the rack 15 is embedded in the chute 13; the body 1 has a Set hole 16, this accommodating hole 16 is to communicate with this chute 13, as shown in Figure 2, the section of this shank 11 is generally H-shaped so that the shank 11 has a groove 17 extending along the shank 11, The width of the groove 17 is about the same as the length of the accommodating hole 16, and the groove 17 extends to the accommodating hole 16, and a tooth bar 15 engaged with the movable jaw 14 is provided in the accommodating hole 16 Worm 2. The worm is in the form of a multiple-thread worm (multiple-thread worm), and in this embodiment, it is in the form of a double-thread worm (double-threadworm) with two intervals and parallel helical lines on the worm 2, so that the worm The lead P of the worm 2 is twice the lead of a common worm, and a spring 22 is provided between the top edge of the worm 2 and the top edge of the accommodating hole 16 to maintain the position of the worm 2 .

Please refer to Fig. 3, which is a schematic plan view of the utility model worm 2, because the worm 2 is a double-thread worm (double-thread worm), and has a lead P twice as long as the general worm lead, and at the same length There can be more teeth 21 meshing with the rack 15. Compared with the single-thread worm shown in Figure 6, the worm 2 of the utility model has the same number of teeth 21 for meshing with the rack 15, but the lead P of the worm 2 of the utility model is smaller than that of the single-thread worm shown in Figure 9 The lead p has doubled, in other words, the utility model can adjust the displacement of the movable jaw 15 more quickly.

Please refer to Figure 4, the lead P of the worm 2 and the lead angle θ have the following relationship:

tanθ=P/πd

It can be seen from the above formula that on the same diameter worm, the increase of the lead P will increase the lead angle θ, that is, the tooth thickness W of the double-thread worm 2 will be thicker than that of the conventional single-thread worm. Thick tooth thickness W will be able to provide better supporting strength to the movable jaw 14 when the worm screw 2 meshes with the rack 15, so that the utility model can bear greater torsional force.

Please refer to Fig. 5 and Fig. 6, which are schematic diagrams of the user turning the worm with fingers, wherein the person shown in Fig. 5 is the state of the utility model, because the section of the handle 11 of the utility model is generally H-shaped, so that the handle 11 has groove 17 on it. Therefore, when the user turns the worm 2 with his finger, the finger can move into the groove 17 to rotate the worm 2 by an angle α. Please refer to Fig. 6 again, which shows the state of the conventional wrench, because the handle 81 is not provided with the groove of the present utility model, therefore, when turning the worm screw 84 with fingers, the fingers can only move to lean against the handle 81 So far, but only drive the worm 84 to rotate the β angle, compared with Fig. 5 and Fig. 6, it can be clearly seen that α>β, that is, the utility model can increase the dialing by the design of the groove 17 of the handle 11 The angle of worm screw 2 is adjusted the moving speed of movable jaw 14 with worm screw 2 to improve.

Certainly, the worm screw 2 of the present utility model can also be designed into the form of a triple-thread worm (triple-thread worm) as shown in Fig. P' is three times the lead p of the single-thread worm shown in Figure 9; The double-thread worm is the same, but is twice the lead p of the single-thread worm shown in FIG. 11 ; or it can be other forms of multiple-thread worm.

On the whole, the utility model designs the worm screw 2 as a multiple-thread worm (multiple-thread worm) without adding any components, so that the utility model is easy to manufacture, and the manufacturing cost is low. Furthermore, the multiple-thread worm The threaded worm can increase the lead P of the worm 2 to quickly adjust the movable jaw 14 to clamp or loosen the workpiece; and the meshing shape of multiple teeth 21 can be maintained between the worm 2 and the rack 15 of the movable jaw 14, and can make the worm The tooth thickness W of 2 is increased to improve the supporting force for the movable jaw 14.

Although the multi-threaded worm is not the original creation of the utility model, in this field of adjustable wrenches, there is no design that directly makes the worm 2 into a multi-threaded worm without adding any components, so the utility model The new design is novel; moreover, the technical features of the utility model have obviously broken through the technical ideas that have been deeply rooted in the technology for a long time, and in addition to increasing the predictable lead P by multiple threaded worms In addition to the efficacy, the design of the present utility model also has the function of maintaining the meshing form of multiple teeth 21 between the worm screw 2 and the rack 15 of the movable jaw 14, and by increasing the tooth thickness W of the worm screw 2, the resistance to the tooth is improved. The effect of the support force of movable jaw 14, and has creativity.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model, All still belong to within the scope of the technical solution of the utility model.

Claims (5)

1. improved spanner, it comprises a body, this body is extended with a shank, and this body is protruding with a fixed jaw at the end with respect to shank, this body has a chute for a movable jaw is set, and this movable jaw has a tooth bar, borrows this tooth bar to be embedded in this chute; It is characterized in that described body has a containing hole, this containing hole is to connect with this chute, be provided with in this containing hole one with the tooth bar engaged worm of this movable jaw, this worm screw is to have multiple tracks at interval and the form of the multiple whorl worm screw of parallel helix on worm screw.

2. improved spanner according to claim 1 it is characterized in that the form of described worm screw for two thread worms, and the helical pitch of this worm screw is the twice of the helical pitch of general single-start worm.

3. improved spanner according to claim 1 is characterized in that described worm screw is the form of three thread worms, and the helical pitch of this worm screw is three times of helical pitch of general single-start worm.

4. improved spanner according to claim 1 is characterized in that described worm screw is the form of three thread worms, and the helical pitch of this worm screw is two times of helical pitch of general single-start worm.

5. improved spanner according to claim 1 is characterized in that the section of described shank generally is H shape, has the groove that extends along shank on the shank, and the width of this groove is approximately identical with the length of this containing hole, and this groove is to extend to this containing hole place.

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