adjustable spanner

Abstract

The present invention relates to a spanner, comprising: a spanner body, comprising a handle and a working head connected to the handle, the working head comprising a fixed jaw and a movable jaw; a screw rod rotatably mounted on the spanner body and engaged with the movable jaw, comprising an axial direction, a peripheral surface around the axial direction, and a plurality of screw threads, the plurality of screw threads being arranged alternately in the axial direction and extending around the axial direction on the peripheral surface in a helical direction, each of the screw threads comprising a thread flank, at least one of the two end portions of at least one of the screw threads comprising an inclined guide surface, which is connected to the thread flank in a transition in the helical direction.

Description

Technical Field

[0001] This invention relates to a hand tool, and more particularly to an adjustable wrench. Background Technology

[0002] Adjustable wrenches have an adjustable opening size to accommodate fasteners of various sizes, and are therefore commonly used in the assembly, disassembly, connection, and tightening of devices. A typical adjustable wrench includes a fixed jaw, a movable jaw that can be adjusted relative to the fixed jaw, and a screw that meshes with the teeth of the movable jaw. By rotating the screw, the movable jaw can be moved closer to or away from the fixed jaw, thereby adjusting the opening size of the adjustable wrench.

[0003] However, in the prior art, the ends of the screw threads extend in the same direction as the helix of the screw thread, which forms a sharp edge at the cut-off end of the screw thread. This not only makes it difficult to smoothly guide the gear row that drives the movable jaw, but also makes it easy to prick and cut hands during operation.

[0004] Therefore, it is necessary to provide a novel and progressive adjustable wrench to solve the above-mentioned problems. Summary of the Invention

[0005] The main objective of this invention is to provide an adjustable wrench in which the screw can be reliably and smoothly guided into the toothed row of the movable jaw that drives the adjustable wrench, and to avoid hand injuries and cuts during operation.

[0006] To achieve the above objectives, the present invention provides an adjustable wrench, comprising: a wrench body including a handle and a working head connected to the handle, the working head including a fixed jaw and a movable jaw; a screw rotatably mounted on the wrench body and engaging with the movable jaw, including an axial direction, a circumferential surface surrounding the axial direction and a plurality of threads, the plurality of threads being alternately arranged on the axial direction and extending on the circumferential surface in a helical direction around the axial direction, each thread including a tooth lateral surface, at least one of the two ends of at least one thread including a beveled guide surface, the beveled guide surface being bent and connected to the tooth lateral surface in the helical direction.

[0007] As a preferred embodiment of the above technical solution, the inclined guide surface is further connected to the peripheral surface.

[0008] As a preferred embodiment of the above technical solution, the inclined guide surface is further connected to an axial end face of the screw.

[0009] As a preferred embodiment of the above technical solution, the inclined guide surface extends radially outward from the axial end face and in a direction away from the axial end face.

[0010] As a preferred embodiment of the above technical solution, each thread further includes an end bevel, which is laterally connected to the circumferential surface and the inclined guide surface.

[0011] As a preferred embodiment of the above technical solution, each thread further includes a top surface of a thread peak and a chamfered surface. The chamfered surface is obliquely connected between the side surface of the thread and the top surface of the thread peak. The oblique chamfered surface is further connected to the end bevel and the chamfered surface.

[0012] As a preferred embodiment of the above technical solution, each thread further includes a top surface of a thread peak and a chamfered surface, the chamfered surface being obliquely connected between the side surface of the thread and the top surface of the thread peak, and the oblique chamfered surface being further connected to the chamfered surface.

[0013] As a preferred embodiment of the above technical solution, preferably, each thread includes the inclined guide surface.

[0014] As a preferred embodiment of the above technical solution, preferably, the ends of the plurality of threads are angularly aligned with respect to the axial direction; each thread includes the inclined guide surface; at least one thread has two ends each including the inclined guide surface; the inclined guide surface is further connected to the circumferential surface; the inclined guide surface is further connected to an axial end face of the screw; the inclined guide surface extends radially outward from the axial end face and obliquely away from the axial end face; each thread further includes a screw peak top surface and a chamfer surface, the chamfer surface being obliquely connected between the thread side surface and the screw peak top surface; the inclined guide surface at one end of the thread connects the end bevel and the chamfer surface, and the inclined guide surface at the other end of the thread connects the end bevel, the chamfer surface and the screw peak top surface; the width of the end bevel is greater than the width of the screw peak top surface; the inclination angle of the inclined guide surface relative to the circumferential surface is greater than the inclination angle of the thread side surface; the difference between the inclination angle of the inclined guide surface and the inclination angle of the circumferential surface is not less than 5 degrees.

[0015] As a preferred embodiment of the above technical solution, preferably, the angle of the inclined guide surface relative to the tooth surface in the direction away from the axial end face is 3 to 35 degrees. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of an adjustable wrench according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0019] Figure 3 This is a perspective view of one of the screws according to an embodiment of the present invention.

[0020] Figure 4 This is another perspective view of a screw according to an embodiment of the present invention.

[0021] Figure 5 This is a radial side view of a screw according to an embodiment of the present invention.

[0022] Figure 6 for Figure 3 The right-side view.

[0023] Figure 7 for Figure 4 The left-side view.

[0024] Figure 8 This is another perspective view of a screw according to an embodiment of the present invention.

[0025] Wherein, 1: screw; 10: circumferential surface; 20: thread; 21: thread flank; 22: inclined guide surface; 23: axial end face; 24: end inclined surface; 25: screw peak top surface; 26: chamfer surface; 100: adjustable wrench; 110: wrench body; 120: handle; 130: working head; 131: fixed jaw; 132: movable jaw; 133: tooth row; A: axial direction; θ: turning angle. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The following examples illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention. The use of "a" or "at least one" before the terms mentioned herein is not a limitation on the quantity, and may also be "multiple" depending on the requirements. This variation in quantity is also within the scope of protection, as will be stated in advance.

[0028] Please refer to Figures 1 to 8 This illustrates an embodiment of the present invention, in which the movable wrench 100 includes a wrench body 110 and a screw 1.

[0029] The wrench body 110 includes a handle 120 and a working head 130 connected to the handle 120. The working head 130 includes a fixed jaw 131 and a movable jaw 132. The screw 1 is rotatably mounted on the wrench body 110 and engages with the movable jaw 132. The screw 1 includes an axial direction A, a circumferential surface 10 surrounding the axial direction A, and a plurality of threads 20. The plurality of threads 20 are arranged alternately on the axial direction A and extend on the circumferential surface 10 in a helical direction around the axial direction A. Each thread 20 includes a tooth lateral surface 21. At least one of the two ends of at least one thread 20 includes a beveled guide surface 22. In the helical direction, the beveled guide surface 22 is bent and connected to the tooth lateral surface 21. Therefore, when adjusting the movable jaw 132 of the adjustable wrench 100, the inclined guide surface 22 can reliably and smoothly guide the tooth row 133 that drives the movable jaw 132, and can avoid pricking or cutting hands during operation.

[0030] In this embodiment, the ends of the plurality of threads 20 are angularly aligned with respect to the axial direction A; however, they may also be non-angularly aligned. Specifically, the screw 1 of the adjustable wrench 100 includes two threads 20 arranged radially opposite each other. However, the screw 1 of the adjustable wrench 100 may include other numbers of threads, which may be odd or even, such as 3, 4, or more. The bend angle θ of the inclined guide surface 22 relative to the tooth side surface 21 in the direction away from the axial end face is 3 to 35 degrees. For example, depending on different sizes, different torque requirements, and / or different radial dimensions of the screw, an appropriate bend angle θ may be designed, such as 5 degrees, 8 degrees, 11 degrees, 14 degrees, 17 degrees, 20 degrees, 23 degrees, 30 degrees, 33 degrees, or any angle between these.

[0031] In this embodiment, the inclined guide surface 22 is further connected to the peripheral surface 10, having a large guiding area. The inclined guide surface 22 is also connected to an axial end face 23 of the screw 1, providing a larger thread length with a smaller overall length, and providing a flat end face to facilitate the operation and rotation of the screw 1, while also strengthening the structural strength of the end of the screw 1. It is understood that the inclined guide surface 22 may also be spaced apart from the axial end face 23 of the screw 1. Specifically, the inclined guide surface 22 extends radially outward from the axial end face 23 and inclined away from the axial end face 23, allowing for smooth insertion into the tooth row 133 of the movable jaw 132 even within a certain error range.

[0032] In detail, each thread 20 further includes an end bevel 24, which is laterally connected to the circumferential surface 10 and the inclined guide surface 22. Each thread 20 also includes a thread peak apex surface 25 and a chamfer surface 26. The chamfer surface 26 is obliquely connected between the thread side surface 21 and the thread peak apex surface 25. The inclined guide surface 22 is also connected to the end bevel 24 and the chamfer surface 26. The inclined guide surface 22 can also be connected to the chamfer surface 26. For example, the inclined guide surface 22 at one end of the thread 20 is connected to the end bevel 24 and the chamfer surface 26, and the inclined guide surface 22 at the other end of the thread 20 is connected to the end bevel 24, the chamfer surface 26 and the thread peak apex surface 25, which can more smoothly guide the thread into the tooth row 133 of the movable jaw 132. The inclined surface 24 can be a concave arc surface, a convex arc surface, or a plane. Preferably, the width of the inclined surface 24 is greater than the width of the top surface 25 of the screw peak, which can increase the area to facilitate pushing the screw 1 and effectively avoid pricking or cutting hands during operation.

[0033] Preferably, each thread 20 includes the inclined guide surface 22, and at least one thread 20 has two end portions that respectively include the inclined guide surface 22. In this embodiment, the inclination angle of the inclined guide surface 22 relative to the peripheral surface 10 is greater than the inclination angle of the tooth side surface 21, and the difference between the inclination angle of the inclined guide surface 22 and the inclination angle of the peripheral surface is not less than 5 degrees. Since each thread 20 has two end portions that respectively include the inclined guide surface 22, the thread 1 can be smoothly guided into the tooth row 133 of the movable jaw 132 during forward and reverse rotation operations, avoiding hand piercing and cuts.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable wrench, characterized in that, include: A wrench body includes a handle and a working head connected to the handle, the working head including a fixed jaw and a movable jaw. and A screw, rotatably mounted on the wrench body and engaging with the movable jaw, includes an axial direction, a circumferential surface surrounding the axial direction, and a plurality of threads. The plurality of threads are arranged alternately on the axial direction and extend on the circumferential surface in a helical direction around the axial direction. Each thread includes a tooth flank. At least one of the two ends of at least one thread includes a beveled guide surface, which is bent and connected to the tooth flank in the helical direction.

2. The adjustable wrench according to claim 1, characterized in that, The inclined guide surface is also connected to the circumferential surface.

3. The adjustable wrench according to claim 1, characterized in that, The inclined guide surface is also connected to one of the axial end faces of the screw.

4. The adjustable wrench according to claim 3, characterized in that, The inclined guide surface extends radially outward from the axial end face and tilts away from the axial end face.

5. The adjustable wrench according to claim 1, characterized in that, Each thread further includes an end bevel, which is laterally connected to the circumferential surface and the inclined guide surface.

6. The adjustable wrench according to claim 5, characterized in that, Each thread further includes a thread peak top surface and a chamfered surface. The chamfered surface is obliquely connected between the thread side surface and the thread peak top surface. The oblique chamfered surface is also connected to the end bevel and the chamfered surface.

7. The adjustable wrench according to claim 1, characterized in that, Each thread further includes a thread peak top surface and a chamfered surface, the chamfered surface being obliquely connected between the thread side surface and the thread peak top surface, and the oblique chamfered surface being further connected to the chamfered surface.

8. The adjustable wrench according to claim 1, characterized in that, Each thread includes the inclined guide surface.

9. The adjustable wrench according to claim 6, characterized in that, The ends of the plurality of threads are angularly aligned with respect to the axial direction; each thread includes a beveled guide surface; at least one thread has two end portions that respectively include the beveled guide surface; the beveled guide surface is further connected to the circumferential surface; the beveled guide surface is further connected to an axial end face of the screw; the beveled guide surface extends radially outward from the axial end face and obliquely away from the axial end face; each thread further includes a screw peak top surface and a chamfered surface, the chamfered surface being obliquely connected between the thread lateral surface and the screw peak top surface; the beveled guide surface at one end of the thread connects the end bevel and the chamfered surface, and the beveled guide surface at the other end of the thread connects the end bevel, the chamfered surface and the screw peak top surface; the width of the end bevel is greater than the width of the screw peak top surface; the inclination angle of the beveled guide surface relative to the circumferential surface is greater than the inclination angle of the thread lateral surface; the difference between the inclination angle of the beveled guide surface and the inclination angle of the circumferential surface is not less than 5 degrees.

10. The adjustable wrench according to any one of claims 3, 4 and 9, characterized in that, The angle of inflection of the inclined guide surface relative to the tooth lateral surface toward the direction away from the axial end face is 3 to 35 degrees.

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