Open wrench structure

Abstract

An open wrench structure includes a handle portion and a drive portion connected to the handle portion, through the structural design of the handle portion and the drive portion, a first extension line, a second extension line, a drive axis, a first intersection, a second intersection, a third intersection, a first connection line, a second connection line, a pull angle, a resistance angle and a concave arc angle are formed, which meet the following conditions:

Description

Technical Field

[0001] This invention relates to hand tools, and in particular to an open-end wrench structure. Prior Technology

[0002] Open-end wrenches, as a common hand tool, play an indispensable role in mechanical assembly, maintenance, and daily life. Their main purpose is to apply torque quickly and accurately, enabling the installation and removal of screws or bolts. Their open-end design allows for rapid insertion and removal of the bolt head, significantly improving work efficiency. Open-end wrenches are particularly suitable for situations requiring frequent tool angle changes or handling multiple bolts.

[0003] The core of an open-end wrench lies in the design of its open-end drive section. This part directly contacts the bolt head or nut and effectively transmits the torque applied by the user to the driven component. A poorly designed open-end drive section can lead to slippage, bolt damage, or even safety accidents. Therefore, it is crucial to provide an open-end wrench structure that ensures both accuracy and durability. Summary of the Invention

[0004] The purpose of this invention is to provide an open-end wrench structure that can solve one of the above-mentioned problems.

[0005] To achieve the aforementioned objectives, the present invention provides an open-end wrench structure, comprising: a handle having a first connecting arc surface and a second connecting arc surface opposite to the first connecting arc surface; and a driving portion connected to the handle, having an outer contour surface segment connected to both the first and second connecting arc surfaces, a first driving surface connected to one end of the outer contour surface segment, a second driving surface connected to the other end of the outer contour surface segment and facing the first driving surface, and a concave arc surface connecting the first driving surface and the second driving surface, wherein the first driving surface, the second driving surface, and the concave arc surface form a driving opening; wherein the extension line of the first driving surface extending toward the handle is a first extension line (L1), and the second driving surface extending toward the handle... The extended line extending in the direction of the first extension line (L1) is the second extension line (L2). The drive axis (L3) is equidistantly positioned between the first extension line (L1) and the second extension line (L2). The point where the drive axis (L3) intersects the concave arc surface is the first intersection point (P1). The point where the first connecting arc surface intersects the outer contour surface segment is the second intersection point (P2). The point where the second connecting arc surface intersects the outer contour surface segment is the third intersection point (P3). The straight line passing through the first intersection point (P1) and the second intersection point (P2) is the first connecting line (C1). The straight line passing through the first intersection point (P1) and the third intersection point (P3) is the second connecting line (C2). The angle between the first connecting line (C1) and the drive axis (L3) is the tension angle (θ_tension). The angle between the second connecting line (C2) and the drive axis (L3) is the resistance angle (θ_resistance). The concave arc surface has a concave arc angle (θ_arc) and satisfies the following conditions:

[0006] 35° < tension angle (θ_t) < 70°; 45° < resistance angle (θ_resistance) < 95°; tension angle (θ_t) < concave arc angle (θ_arc); resistance angle (θ_resistance) < concave arc angle (θ_arc); and the second intersection point (P2) and the third intersection point (P3) are outside the range formed by the first extension line (L1) and the second extension line (L2).

[0007] The advantages of this invention are: when the following conditions are met: 35° < tension angle (θ_pull) < 70°; 45° < resistance angle (θ_resistance) < 95°; tension angle (θ_pull) < concave arc angle (θ_arc); resistance angle (θ_resistance) < concave arc angle (θ_arc); and the second intersection point (P2) and the third intersection point (P3) are outside the range formed by the first extension line (L1) and the second extension line (L2), the structural strength of the drive part of the open-end wrench can be improved to provide the maximum torque value.

[0008] Preferably, the drive unit has a maximum width range (W), and the second intersection point (P2) and the third intersection point (P3) are within the maximum width range (W). Simple Explanation of the Diagram

[0009] Figure 1 is a perspective view of an embodiment of the present invention; and Figure 2 is a partial top view of an embodiment of the present invention. Implementation

[0010] Referring to Figures 1 and 2, the open-end wrench structure provided in the first embodiment of the present invention mainly consists of a handle (10) and a driving part (20), wherein:

[0011] The handle (10) is for the user to hold and turn, and has a first connecting arc surface (11) and a second connecting arc surface (12) opposite to the first connecting arc surface (11); in this embodiment, the first connecting arc surface (11) and the second connecting arc surface (12) are relatively concave.

[0012] The drive unit (20) is connected to the handle (10) and is used to drive a driven element to rotate. The drive unit (20) has an outer contour surface segment (21) that is connected to the first connecting arc surface (11) and the second connecting arc surface (12), a first drive surface (22) that is connected to one end of the outer contour surface segment (21), a second drive surface (23) that is connected to the other end of the outer contour surface segment (21) and faces the first drive surface (22), and a concave arc surface (24) that is connected between the first drive surface (22) and the second drive surface (23). The first drive surface (22), the second drive surface (23) and the concave arc surface (24) form a drive opening (25).

[0013] The present invention is particularly designed in that: the extension line of the first driving surface (22) extending toward the handle (10) is the first extension line (L1). The extension line of the second driving surface (23) extending toward the handle (10) is the second extension line (L2), and the second extension line (L2) is parallel to the first extension line (L1).

[0014] The drive axis (L3) is set equidistantly between the first extension line (L1) and the second extension line (L2), that is, the vertical distance between the drive axis (L3) and the first extension line (L1) is the same as the vertical distance between the drive axis (L3) and the second extension line (L2); at the same time, the point where the drive axis (L3) intersects the concave arc surface (24) is the first intersection point (P1).

[0015] The first connecting arc surface (11) intersects the outer contour surface segment (21) at a point that is the second intersection point (P2). It should be noted that the second intersection point (P2) refers to the endpoint of the straight line formed by the intersection of the first connecting arc surface (11) and the outer contour surface segment (21).

[0016] The third intersection point (P3) is the point where the second connecting arc surface (12) intersects the outer contour surface segment (21). It should be noted that the third intersection point (P3) refers to the endpoint of the straight line formed by the intersection of the second connecting arc surface (12) and the outer contour surface segment (21).

[0017] The straight line passing through the first intersection point (P1) and the second intersection point (P2) is the first connecting line (C1). The straight line passing through the first intersection point (P1) and the third intersection point (P3) is the second connecting line (C2).

[0018] The angle between the first connecting line (C1) and the drive axis (L3) is the tension angle (θ_tension). The angle between the second connecting line (C2) and the drive axis (L3) is the resistance angle (θ_resistance). The concave arc surface (24) has a concave arc angle (θ_arc). In this embodiment, the concave arc angle (θ_arc) = 74 degrees and satisfies the following conditions:

[0019] The tension angle (θ_tension) is 52°, but it is not a limitation; the tension angle (θ_tension) can be between 35° and 70°.

[0020] The resistance angle (θ) is 67°, but it is not limited to this; the resistance angle (θ) can be between 45° and 95°.

[0021] As can be seen from the above, the difference between the tension angle (θ_tension) and the resistance angle (θ_resistance) is not significant, and both are smaller than the concave arc angle (θ_arc) in the design.

[0022] The second intersection point (P2) and the third intersection point (P3) are outside the area formed by the first extension line (L1) and the second extension line (L2).

[0023] In addition, the drive unit (20) has a maximum width range (W), and the second intersection point (P2) and the third intersection point (P3) are within the maximum width range (W).

[0024] With a design of 35° < tension angle (θ_pull) < 70°, the operating efficiency of the open-end wrench is improved and wear is reduced. It also allows for continuous operation in limited spaces, reducing the need for the wrench's rotation angle. In addition, the tension angle (θ_pull) design also allows users to operate quickly in narrow spaces where they can only move the wrench slightly.

[0025] With a design of 45° < resistance angle (θ resistance) < 95°, the stability of the open-end wrench when applying torque is maximized, and slippage or damage to the bolt head is avoided. At the same time, the effective contact area between the drive unit and the bolt is increased, and the torque is evenly distributed in the contact area, reducing stress concentration.

[0026] By designing the angles of the tension angle (θ_tension) and the resistance angle (θ_resistance), and by ensuring that both the tension angle (θ_tension) and the resistance angle (θ_resistance) are smaller than the concave arc angle (θ_arc), and by designing that the second intersection point (P2) and the third intersection point (P3) are outside the range formed by the first extension line (L1) and the second extension line (L2), the tightness of the fit between the open-end wrench and the driven component can be improved, preventing slippage due to insufficient resistance. This ensures the stability and accuracy of torque transmission under high torque, while also ensuring the safety and durability of the open-end wrench and the driven component. Ultimately, this achieves the design objective of enhancing the structural strength of the drive unit of the open-end wrench to provide the maximum torque value.

[0027] 10: Handle 11: First connecting arc surface 12: Second connecting arc surface 20: Drive Unit 21: Outer contour surface segment 22: First driving surface 23: Second driving surface 24: Concave arc surface 25: Drive opening L1: First extension line L2: Second extension line L3: Drive axis P1: First intersection point P2: Second intersection point P3: Third intersection point C1: First connecting line C2: Second connecting line θ resistance: angle of resistance θ_tight: Angle of tension θ arc: concave arc angle W: Maximum width range

Claims

1. An open-end wrench structure, comprising: a handle (10) having a first connecting arc surface (11) and a second connecting arc surface (12) opposite to the first connecting arc surface (11); and a drive portion (20) connected to the handle (10), having an outer contour surface segment (21) simultaneously connected to the first connecting arc surface (11) and the second connecting arc surface (12), a first drive surface (22) connected to one end of the outer contour surface segment (21), a second drive surface (23) connected to the other end of the outer contour surface segment (21) and facing the first drive surface (22), and a concave arc surface (24) connecting the first drive surface (22) and the second drive surface (23), wherein the first drive surface (22), the second drive surface (23) and the concave arc surface (24) form a drive opening (25); wherein, The extension line of the first driving surface (22) extending toward the handle (10) is the first extension line (L1), and the extension line of the second driving surface (23) extending toward the handle (10) is the second extension line (L2). A driving axis (L3) is equidistantly positioned between the first extension line (L1) and the second extension line (L2). The point where the driving axis (L3) intersects the concave arc surface (24) is the first intersection point (P1). The point where the first connecting arc surface (11) intersects the outer contour surface segment (21) is the second intersection point (P2). The second connecting arc surface (12)... The point where the outer contour surface segment (21) intersects is the third intersection point (P3). The straight line passing through the first intersection point (P1) and the second intersection point (P2) is the first connecting line (C1). The straight line passing through the first intersection point (P1) and the third intersection point (P3) is the second connecting line (C2). The angle between the first connecting line (C1) and the drive axis (L3) is the tension angle (θ_tension). The angle between the second connecting line (C2) and the drive axis (L3) is the resistance angle (θ_resistance). The concave arc surface (24) has a concave arc angle (θ_arc) and satisfies the following conditions: 35° < tension angle (θ_pull) < 70°; 45° < resistance angle (θ_resistance) < 95°; tension angle (θ_pull) < concave arc angle (θ_arc); resistance angle (θ_resistance) < concave arc angle (θ_arc); and the second intersection point (P2) and the third intersection point (P3) are outside the range formed by the first extension line (L1) and the second extension line (L2); wherein the drive unit (20) has a maximum width range (W), and the second intersection point (P2) and the third intersection point (P3) are within the maximum width range (W).

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