CN219380507U - Adjustable wrench - Google Patents

Abstract

The utility model discloses an adjustable spanner, which belongs to a manual tool, wherein when the conventional adjustable spanner applies torque to a workpiece, the fit clearance between a worm wheel and a worm is increased, so that the maximum torque which can be applied to the workpiece by the adjustable spanner is smaller. The matching clearance between the worm wheel and the worm is prevented from being increased by the resistance, and the matching clearance between the worm wheel and the worm is kept so as to increase the maximum torque applied to the workpiece by the adjustable spanner.

Description

Adjustable wrench

Technical Field

The utility model belongs to a manual tool, and particularly relates to an adjustable spanner which can apply larger torsion to a clamped workpiece.

Background

The adjustable spanner is a manual tool for applying torque to nuts, bolts, and the like. The adjustable spanner is provided with a fixed clamping jaw and a movable clamping jaw, and the worm is shifted to rotate so as to drive the worm wheel to drive the movable clamping jaw to move relative to the fixed clamping jaw, so that the distance between the movable clamping jaw and the fixed clamping jaw is adjusted, and workpieces with different specifications are clamped and torque is applied to the workpieces.

The worm wheel and the worm have self-locking capability, when the workpiece is preliminarily clamped by stirring the worm, the movable clamping jaw is locked at the initial clamping position, and when torque is applied to the workpiece, the movable clamping jaw can always keep an ideal working state of the movable wrench for clamping the workpiece.

However, when a torque is applied to a workpiece by the adjustable wrench, the torque applied to the adjustable wrench and the reaction force from the workpiece can cause the movable clamping jaw and the stressed part contacted with the movable clamping jaw to slightly deform, for example, the side walls on two sides of the neck of the movable clamping jaw incline outwards to lose the limit on the position of the worm, and therefore, the worm wheel arranged on the movable clamping jaw deviates from the worm, and the fit clearance between the worm wheel and the worm is enlarged.

The above factors can cause too loose fit (too large fit clearance) of the worm wheel and the worm when torque is applied to a workpiece through the adjustable wrench, so that the adjustable jaw cannot be kept at an initial clamping position, the movable jaw generates micro displacement, the distance between the movable jaw and the fixed jaw is increased, the workpiece cannot be clamped and effective torque is applied, the workpiece can be slipped between the movable jaw and the fixed jaw due to severe torque, and the maximum torque which can be applied to the workpiece by the adjustable wrench is small.

Disclosure of Invention

The utility model aims to solve the technical problems and the technical task of solving the defect that the maximum torque applied to a workpiece by an adjustable spanner is smaller because the fit clearance between a worm wheel and a worm is increased when the torque is applied to the workpiece by the conventional adjustable spanner, and provides a device for maintaining the fit clearance between the worm wheel and the worm to increase the maximum torque applied to the workpiece by the adjustable spanner when the torque is applied to the workpiece.

In order to achieve the above purpose, the adjustable wrench of the utility model comprises a grab handle, a fixed clamping jaw and a movable clamping jaw, wherein the fixed clamping jaw and the movable clamping jaw are connected with the grab handle into a whole;

the adjacent part of the grab handle and the fixed clamping jaw is provided with a track groove and two opposite side walls extending from two sides of the track groove, and the adjacent part is also provided with a worm which can be shifted;

the movable clamping jaw is provided with a shaft part, a neck part and two opposite bottom surfaces which are connected into a whole, the neck part is positioned between the two opposite bottom surfaces and the shaft part, and the shaft part is provided with a worm wheel;

the shaft part is positioned in the track groove, the neck part is positioned between the two side walls, the two bottom surfaces are matched with the top surfaces of the two side walls, and the worm wheel is meshed with the worm for stirring the worm wheel to drive the movable clamping jaw to move relative to the fixed clamping jaw;

wherein restraining means are provided for the two opposing side walls which prevent the two opposing side walls from opening when torque is applied to a workpiece held between the movable jaw and the fixed jaw by the grip.

Therefore, when torque is applied to the workpiece by the adjustable spanner, the side wall is prevented from expanding, so that the fit clearance between the worm wheel and the worm is prevented from increasing, and the fit clearance between the worm wheel and the worm is kept so as to increase the maximum torque applied to the workpiece by the adjustable spanner.

In one embodiment, the restraining means is two opposing bottom surfaces that clamp the two opposing side walls. Specifically, a clamping groove is formed between the bottom surface and the neck, and the outline of the top surface of the side wall is matched with the clamping groove. The structure can be realized by only changing the structure and the matching form of the movable chuck and the adjacent part, and the structure is simple and reliable. In particular, the bottom surface may be planar or curved. And the bottom surface comprises at least two adjoining surfaces. The flat or curved surface has the effect of guiding or moving the jaws when the movable jaws are adjusted by the worm, and simultaneously prevents the movable jaws from shaking. When torque is applied to the workpiece through the adjustable spanner, the plane or the curved surface performs clamping action by means of the side wall of the reaction force for applying the torque to the workpiece, so that the two opposite side walls are prevented from being opened, and the matching relation between the worm wheel and the worm is ensured.

Preferably, one end of the track groove is a closed hole, the closed hole is adjacent to the fixed clamping jaw, the other end of the track groove is an open end, and the open end is far away from the fixed clamping jaw; the clamping groove is positioned at one end of the movable clamping jaw, which is far away from the fixed clamping jaw. When torque is applied to a workpiece through the adjustable spanner, the structure can clamp the side wall positioned at the open end of the track groove, and the deformation resistance of the side wall at the position is improved.

In another embodiment, one end of the track groove is a closed hole, the closed hole is adjacent to the fixed clamping jaw, the other end of the track groove is an open end, and the open end is far away from the fixed clamping jaw; the restraining means is a reinforcing portion connected between ends of the side walls adjacent to the open end. Thus, the two opposing sidewalls are prevented from opening by the reinforcement when torque is applied to the workpiece. Specifically, the reinforcing part is a pull rod welded between two side walls or a pull rod assembled between two side walls.

In another embodiment, the restraining means is that the thickness of the side wall gradually increases from the top surface of the side wall toward the track groove. The two opposite side walls are prevented from opening by increasing the size and strength of the side walls when torque is applied to the workpiece. In particular, the thickness of the root of the side wall and the radius of the track groove are consistent with W more than or equal to 0.8R, wherein W is the thickness of the root of the side wall, and R is the radius of the track groove. To increase the strength of the sidewall root.

In the embodiment, the shaft part is in sliding fit with the wall of the track groove through the curved surface, and when the movable clamping jaw bears torque, the shaft part and the wall of the track groove have larger contact area, so that the capacity of the contact part for resisting the deformation of the molding can be increased.

The present utility model is achieved by providing two opposing side walls with restraining means which prevent the two opposing side walls from opening when torque is applied by the handles to a workpiece held between the movable jaw and the fixed jaw. The matching clearance between the worm wheel and the worm is prevented from being increased by the resistance, and the matching clearance between the worm wheel and the worm is kept so as to increase the maximum torque applied to the workpiece by the adjustable spanner.

Drawings

FIG. 1 is an isometric view of embodiment 1 of the adjustable wrench of the present utility model;

FIG. 2 is an exploded view of the adjustable wrench of FIG. 1;

FIG. 3 is a schematic front view of the adjustable wrench of FIG. 1;

FIG. 4 is a cross-sectional view taken along the direction A-A of FIG. 3;

FIG. 5 is a right side view of FIG. 3;

FIG. 6 is a B-B sectional view of FIG. 5;

FIG. 7 is an isometric view of embodiment 2 of the adjustable wrench of the present utility model;

FIG. 8 is an exploded view of the adjustable wrench of FIG. 7;

FIG. 9 is a schematic front view of the adjustable wrench of FIG. 7;

FIG. 10 is a C-C cross-sectional view of FIG. 9;

FIG. 11 is a right side view of FIG. 9;

FIG. 12 is a D-D sectional view of FIG. 11;

FIG. 13 is an isometric view of example 3 of the adjustable wrench of the present utility model;

FIG. 14 is an exploded view of the adjustable wrench of FIG. 13;

FIG. 15 is a schematic front view of the adjustable wrench of FIG. 13;

FIG. 16 is an E-E cross-sectional view of FIG. 15;

FIG. 17 is a right side view of FIG. 15;

FIG. 18 is a cross-sectional view taken along the F-F direction of FIG. 17;

FIG. 19 is a cross-sectional view of embodiment 4 of the adjustable wrench of the present utility model;

the reference numerals in the figures illustrate:

100 handles;

200, fixing clamping jaws;

300 adjacent portions;

400 movable clamping jaw: 401 shaft, 402 neck, 403 first plane, 404 second plane, 405 worm gear, 406 clamping groove, 407 curved surface, 408 first curved surface, 409 plane, 410 oblique plane;

500 track grooves, 501 closing the holes, 502 open ends;

600 sidewalls;

700 worm, 701 pin shaft;

800 reinforcements;

900 workpieces;

the thickness of the root of the W side wall and the radius of the R track groove.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms "comprises" and "comprising" and any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such as a method or article, that comprises a list of features does not necessarily limit the features to those expressly listed, but may include other features not expressly listed that may be included in such method or article.

In the description of the present utility model, it should be understood that the technical features defined by the terms "first", "second", etc. having sequential concepts are merely for the purpose of clearly describing the defined technical features, so that the defined technical features can be clearly distinguished from other technical features, and are not so named as to represent actual implementation, and thus should not be construed as limiting the present utility model.

The present utility model will be described in detail with reference to specific embodiments and drawings.

Example 1

As shown in fig. 1-6, the adjustable wrench includes a grip handle 100, a stationary jaw 200 integrally connected to the grip handle, and an adjustable jaw 400.

The abutment 300 of the grip 100 with the stationary jaw 200 is provided with a track groove 500 and two opposite side walls 600 extending from both sides of the track groove, which abutment 300 is further equipped with a worm 700 that can be shifted by means of a pin 701.

The movable jaw 400 has a shaft portion 401, a neck portion 402 and two opposite bottom surfaces connected as one body, the neck portion 402 being located between the two opposite bottom surfaces and the shaft portion, the shaft portion being provided with a worm gear 405.

The shaft 401 of the movable clamping jaw 400 is located in the track groove 500, the neck 402 is located between the two side walls 600, the two bottom surfaces are matched with the top surfaces of the two side walls, and the worm wheel 405 is meshed with the worm 700 to toggle the worm wheel to drive the movable clamping jaw to move relative to the fixed clamping jaw.

In this embodiment, a clamping groove 406 is formed between the bottom surface and the neck, and the top surface of the sidewall 600 is contoured to match the clamping groove 406. Therefore, the clamping action of the two opposite side walls by the two opposite bottom surfaces constitutes a restraining means arranged on the two opposite side walls. The restraining means prevents the two opposing sidewalls from opening when torque is applied by the grip to a workpiece held between the movable jaw and the fixed jaw.

In this embodiment, the bottom surface includes a first plane 403 and a second plane 404 that intersect. The first plane 403 intersects the sides of the neck and maintains a first included angle, which is a right angle. The second plane 404 intersects the first plane 403 at a second included angle, which is an obtuse angle. And the second plane and the side surface of the neck keep a third included angle, and the third included angle is an acute angle. In this way, the first plane 403 and the second plane 404 form a clamping groove 406.

Also, one end (right end shown in fig. 6) of the rail groove 500 is a closed hole 501, the closed hole 501 abuts the fixing jaw 200, the other end (left end shown in fig. 2) of the rail groove 500 is an open end 502, and the open end 502 is away from the fixing jaw 200; clamping groove 406 is located at an end of movable jaw 400 remote from stationary jaw 200.

In this embodiment, the shaft 401 is slidably engaged with the wall of the track groove 500 via the symmetrical curved surface 407, and when the movable jaw receives the torque M shown in fig. 6, the wall of the track groove and the shaft have a larger contact area as shown in fig. 4, so that the capability of the contact portion against the shaping deformation can be increased, and the service life of the adjustable wrench can be prolonged.

As shown in fig. 6, the movable jaw 400 clamps a workpiece 900 with the fixed jaw 200. When torque is applied to a workpiece by a wrench, movable jaw 400 receives a reaction force N of the workpiece. The reaction force N will apply a torque M to the movable jaw as indicated by the circular arc arrow. This torque will apply a pushing force F to both side walls through the shaft portion as shown in fig. 4. Under the condition that the two side walls are not restrained, the thrust force F can lead the two side walls to open and incline to lose the limit on the position of the worm or generate the trend, the movable clamping jaw and the stress part contacted with the movable clamping jaw can be driven to slightly deform, the worm wheel arranged on the movable clamping jaw deviates from the worm to enlarge the fit clearance between the worm wheel and the worm, the distance between the movable clamping jaw and the fixed clamping jaw is increased, the workpiece cannot be clamped and effective torque can not be applied, and the workpiece can be caused to slide between the movable clamping jaw and the fixed clamping jaw in severe cases, so that the maximum torque which can be applied to the workpiece by the movable spanner is smaller.

In this embodiment, the two opposing side walls are held by the two opposing bottom surfaces to form the restraining means disposed on the two opposing side walls. Therefore, the two side walls are prevented from being opened under the action of the thrust force F, so that the matching relation between the worm wheel and the worm is maintained, and the gap between the worm wheel and the worm is prevented from being increased, so that the maximum torque applied to a workpiece by the adjustable spanner is increased.

Example 2

As shown in fig. 7 to 12, the adjustable spanner is different from the adjustable spanner of embodiment 1 only in the shape of the bottom surface and the clamping groove formed therein and the contour of the top surface of the side wall 600. In this embodiment, the bottom surface is a first curved surface 408, and the first curved surface 408 and the side surface of the neck 402 form a clamping groove 406.

Accordingly, since the bottom surfaces are coincident with the top surfaces of the sidewalls, the profile of the top surface of sidewall 600 varies with the profile of the bottom surface.

Example 1 shows that the first plane and the second plane form the bottom surface, and example 2 shows that one first curved surface forms the bottom surface. In other embodiments, the plane forming the bottom surface may not be limited to two planes or one curved surface, but may be one plane, three or more intersecting planes, two or more intersecting curved surfaces, or an intersecting plane and a curved surface.

Example 3

As shown in fig. 13 to 18, the adjustable spanner is different from the adjustable spanner of embodiment 1 in the shape of the restraining means and the bottom surface and the contour of the top surface of the side wall 600. The other structures are the same as those of embodiment 1, and will not be described again.

In this embodiment, one end of the track groove 500 is a closed hole 501, the closed hole 501 abuts the fixed jaw 200, the other end of the track groove 500 is an open end 502, and the open end 502 is far away from the fixed jaw 200; the restraining means is a reinforcing portion 800 connected between the ends of the side walls adjacent the open end. The reinforcing portion is a tie rod welded between both side walls. Specifically, the movable clamping jaw is assembled in place and then welded, and polishing is performed. In other embodiments, the reinforcement may also be a tie rod fitted between the two side walls. When the two side walls open or the opening trend is generated, the reinforcing part is prevented like a pull rod. The sidewalls open or tend to open, thereby increasing the maximum torque applied to the workpiece by the adjustable wrench.

In this embodiment, since the restraining means is implemented by the reinforcement 800, the bottom surface and the top surface of the sidewall 600 are both flat 409, and the bottom surface does not constitute a clamping groove. It is not excluded that in other embodiments the clamping groove is also formed by the bottom surface and the top surface of the side wall 600 is adapted when the restraining means is implemented by the reinforcement 800.

Example 4

As shown in fig. 19, the adjustable spanner is different from the adjustable spanner of embodiment 1 in the following two points: the first is that the constraint means is different, and the second is that the shape of the bottom surface and the contour of the top surface of the sidewall 600 are different from those of embodiment 1. The other structures are the same as those of embodiment 1, and will not be described again.

First, in this embodiment, the restraining means is that the thickness of the sidewall 600 gradually increases from the top surface of the sidewall toward the track groove. Further, the thickness of the root of the side wall and the radius of the track groove are consistent with W more than or equal to 0.8R, wherein W is the thickness of the root of the side wall, and R is the radius of the track groove. In this structure, because the thickness of the root parts of the side walls is increased, when the two side walls are about to open under the action of the thrust force F, the root parts of the side walls can resist the opening, so that the matching relation between the worm wheel and the worm is maintained, the gap between the worm wheel and the worm is prevented from being increased, and the maximum torque applied to a workpiece by the adjustable spanner is increased.

Next, in this embodiment, since the restraining means is realized by increasing the thickness of the sidewall 600, the bottom surface and the top surface of the sidewall 600 are both inclined planes 410, and the bottom surface does not constitute a clamping groove. Accordingly, when the movable jaw is subjected to the illustrated torque M as shown in FIG. 6, the left end portion of the top surface of the sidewall 600 will exert a resistive force against the movable jaw by means of the inclined plane 410, preventing the movable jaw from being deformed.

In other embodiments, it is not excluded that the clamping groove is also formed by the bottom surface and the top surface of the side wall 600 is adapted when the restraining means is implemented by increasing the thickness of the side wall 600.

Through experiments, the maximum torque applied by the wrench in each embodiment to the workpiece can reach 2-2.5 times of American standard.

Claims (12)

1. An adjustable spanner comprises a grab handle (100), a fixed clamping jaw (200) and a movable clamping jaw (400), wherein the fixed clamping jaw (200) and the movable clamping jaw are connected with the grab handle into a whole;

the adjacent part (300) of the grab handle and the fixed clamping jaw is provided with a track groove (500) and two opposite side walls (600) extending from two sides of the track groove, and the adjacent part is also provided with a worm (700) which can be shifted;

the movable clamping jaw is provided with a shaft part (401), a neck part (402) and two opposite bottom surfaces which are connected into a whole, the neck part is positioned between the two opposite bottom surfaces and the shaft part, and the shaft part is provided with a worm wheel (405);

the shaft part (401) is positioned in the track groove (500), the neck part (402) is positioned between the two side walls (600), the two bottom surfaces are matched with the top surfaces of the two side walls, and the worm wheel (405) is meshed with the worm (700) and is used for stirring the worm wheel to drive the movable clamping jaw to move relative to the fixed clamping jaw;

the method is characterized in that: the two opposite side walls are provided with restraining means which prevent them from opening when torque is applied by the grab handle to a workpiece clamped between the movable jaw and the fixed jaw.

2. The adjustable wrench of claim 1, wherein: the restraining means is that two opposite bottom surfaces clamp two opposite side walls.

3. The adjustable wrench of claim 2, wherein: a clamping groove (406) is formed between the bottom surface and the neck, and the outline of the top surface of the side wall is matched with the clamping groove.

4. The adjustable wrench of claim 3, wherein: the bottom surface is a plane or a curved surface.

5. The adjustable wrench of claim 3 or 4, wherein: the bottom surface includes at least two adjoining surfaces.

6. The adjustable wrench of claim 3, wherein: one end of the track groove (500) is a closed hole (501), the closed hole (501) is adjacent to the fixed clamping jaw (200), the other end of the track groove (500) is an open end (502), and the open end (502) is far away from the fixed clamping jaw (200); the clamping groove (406) is located at an end of the movable jaw (400) remote from the fixed jaw.

7. The adjustable wrench of claim 1, wherein: one end of the track groove is a closed hole, the closed hole is adjacent to the fixed clamping jaw, the other end of the track groove is an open end, and the open end is far away from the fixed clamping jaw; the restraining means is a reinforcing portion (800) connected between the ends of the two side walls (600) adjacent to the open end.

8. The adjustable wrench of claim 7, wherein: the reinforcing part is a pull rod welded between the two side walls.

9. The adjustable wrench of claim 7, wherein: the reinforcing part is a pull rod assembled between the two side walls.

10. The adjustable wrench of claim 1, wherein: the restraining means is that the thickness of the side wall gradually increases from the top surface of the side wall to the track groove.

11. The adjustable wrench of claim 10, wherein: the thickness of the root of the side wall and the radius of the track groove are consistent with W more than or equal to 0.8R, wherein W is the thickness of the root of the side wall, and R is the radius of the track groove.

12. The adjustable wrench of claim 1, wherein: the shaft portion (401) is slidably engaged with the wall of the track groove (500) via a curved surface (407).