Crowfoot wrench

Abstract

To provide a crowfoot wrench which achieves high versatility for various kinds of auxiliary handles and can be used in a narrow site bending in a crank shape.SOLUTION: A crowfoot wrench 2 includes: a head 4 having a fastening port part 10 into which an object to be fastened is fitted; and a body 8 which is rotatably connected to a base end 4a of the head 4 through a hinge mechanism 6. In the body 8, at least two types of attachment hole parts 14 into each of which a connection end of an auxiliary handle is fitted are disposed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a clawfoot trench. [Background technology]

[0002] Claw-foot wrenches are known as wrenches used in complicated spaces with obstacles, such as when tightening pipes in automobiles or various machines. These claw-foot wrenches are small wrenches that lack the handle found on typical spanners and wrenches and are used in combination with an auxiliary handle. A typical claw-foot wrench, as shown in FIG. 5 of Patent Document 1 (Patent Document 1, Prior Art), has a tightening jaw into which a bolt or nut is fitted and an attachment hole into which the connecting end of the auxiliary handle is detachably fitted. A ratchet handle is known as one type of auxiliary handle. A ratchet handle has a head equipped with a ratchet mechanism. A claw-foot wrench is attached to the head, and the handle can be rotated with the bolt or nut fitted into the claw-foot wrench to tighten or loosen the bolt or nut. The head of the ratchet handle has a rectangular protrusion, known as a socket angle, extending perpendicular to the handle axis as the connecting end. By fitting this insertion angle into the mounting hole of the claw foot wrench, the claw foot wrench and the ratchet handle serving as an auxiliary handle are integrated.

[0003] In addition to being able to attach various auxiliary handles directly to the mounting hole, various auxiliary handles can also be attached via an extension rod, as shown in Figures 5 and 7 of Patent Document 2, for example.

[0004] Furthermore, for bolts and nuts in complicated locations such as those described above, it may be necessary to control the tightening torque, and in such cases, a torque wrench with an interchangeable head is attached as an auxiliary handle instead of a ratchet handle. An example of a torque wrench with an interchangeable head is the torque wrench shown in Patent Document 3. The tightening torque of bolts and nuts is controlled by attaching a claw-foot wrench directly or via an extension rod to the tip of such a torque wrench. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 4-136664 [Patent Document 2] Japanese Patent Application Publication No. 2019-202379 [Patent Document 3] Japanese Patent Application Publication No. 2018-008344 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, in the torque wrench shown in Patent Document 3, a connecting portion is formed on the head portion thereof, extending in a direction along the axis of the torque wrench handle. A claw-foot wrench is then attached to this connecting portion. However, because the protruding direction of the connecting portion of the torque wrench and the insertion angle of the ratchet handle described above differ, it is difficult to directly attach a claw-foot wrench used with a ratchet handle. An adapter is required to change the insertion direction of the torque wrench's connecting portion, or a claw-foot wrench specifically for the torque wrench with a modified mounting hole direction must be prepared.

[0007] As described above, the direction in which the connecting portion protrudes relative to the axis of the handle varies depending on the type of auxiliary handle, making it difficult for a claw-foot wrench to accommodate these various types of auxiliary handles.

[0008] Furthermore, narrow spaces that cannot be reached with ordinary tools include narrow spaces that are bent like a crank, as shown in Figures 10 and 11. More specifically, when the target bolt 62 is located at the end of a vertically bent crank-shaped area 60 as shown in Figure 10, an ordinary open-end wrench 70 cannot reach the position of the bolt 62. Also, when the target bolt 66 is located at the end of a horizontally bent crank-shaped area 64 as shown in Figure 11, an ordinary open-end wrench 70 cannot reach the position of the bolt 66.

[0009] There is a demand for easy tightening of bolts and nuts in such narrow and curved spaces.

[0010] The present invention was made based on the above circumstances, and its purpose is to provide a claw foot wrench that is highly versatile for various auxiliary handles and can be used in narrow spaces that are bent in a crank shape. [Means for solving the problem]

[0011] In order to achieve the above object, the claw foot trench of the present invention comprises a head having a clamping opening into which the object to be clamped is fitted, and a body rotatably connected to the base end of the head via a hinge mechanism, and the body is characterized in that it has at least two types of mounting holes into which the connecting end of an auxiliary handle is fitted.

[0012] As described above, since the claw foot wrench of the present invention has at least two types of mounting holes for fitting the connecting end of the auxiliary handle, it can be combined with various auxiliary handles and is highly versatile. Furthermore, since the hinge mechanism of the claw foot wrench of the present invention allows the body to be positioned horizontally or perpendicularly to the head, it can be used in both cases where the connecting end of the auxiliary handle protrudes perpendicularly to the axis of the auxiliary handle and in a direction along the axis of the auxiliary handle, making it highly versatile and usable in narrow spaces where the auxiliary handle is bent like a crank.

[0013] It is also preferable that the mounting hole portion includes at least a first mounting hole portion and a second mounting hole portion, the first mounting hole portion being circular and corresponding to the auxiliary handle whose connecting end is a circular protrusion, and the second mounting hole portion being rectangular and corresponding to the auxiliary handle whose connecting end is a rectangular protrusion.

[0014] With this configuration, torque wrenches, which often have a circular connection end, can be attached to the first mounting hole, and ratchet handles, which often have a square protrusion connection end, can be attached to the second mounting hole, making it easy to accommodate different types of auxiliary handles.

[0015] It is also preferable that the fastening mouth portion is annular and has corners on its inner circumferential surface that are a multiple of six.

[0016] With this configuration, if there is an obstacle around the bolt or nut, the tightening mouth portion can be fitted onto the bolt or nut from above.

[0017] It is also preferable that the fastening mouth portion is configured as an open-ended U-shaped portion with an open tip.

[0018] With this configuration, if there is an obstacle above the bolt or nut, the tightening mouth portion can be fitted onto the bolt or nut from the side.

[0019] It is also preferable that the body has a rectangular parallelepiped shape that is thicker than the head, the first mounting hole portion is a circular through-hole provided in the rear end surface of the body positioned opposite the head, and the second mounting hole portion is a rectangular through-hole extending from the upper end surface to the lower end surface of the body perpendicular to the rear end surface.

[0020] This configuration allows the overall length of the clawfoot trench to be reduced. [Effects of the Invention]

[0021] According to the present invention, a claw foot wrench can be provided that is highly versatile for use with various auxiliary handles and can be used in narrow spaces that are bent in a crank shape. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1(a) is a plan view showing a claw-foot trench according to a first embodiment, and FIG. 1(b) is a side view showing the claw-foot trench according to the first embodiment. [Figure 2] 1A is a side view showing a state in which the body of the claw foot trench according to the first embodiment is rotated upward, and FIG. 1B is a side view showing a state in which the body is rotated downward. [Figure 3] FIG. 2 is a perspective view of the claw-foot wrench according to the first embodiment, seen from the rear, with the body rotated. [Figure 4] 1 is a perspective view showing a state in which a claw-foot wrench according to a first embodiment is attached to a torque wrench. FIG. [Figure 5] FIG. 1 is a perspective view showing an aspect in which an extension rod is attached to the claw foot trench according to the first embodiment. [Figure 6]FIG. 10 is a side view diagrammatically illustrating the use of a claw foot wrench attached to a spinner handle to tighten a bolt at a vertical crank. [Figure 7] 1 is a perspective view showing a state in which a claw-foot wrench according to a first embodiment is attached to a ratchet handle. FIG. [Figure 8] FIG. 10 is a plan view showing a schematic diagram of a claw-foot wrench attached to a ratchet handle tightening a bolt at a horizontal cranked bend. [Figure 9] FIG. 10 is a plan view showing a claw foot trench according to a second embodiment. [Figure 10] FIG. 10 is a perspective view showing the relationship between a bolt and a wrench at a location where the bolt is bent in a vertical crank shape. [Figure 11] FIG. 10 is a perspective view showing the relationship between a bolt and a wrench at a position where the bolt is bent in a horizontal crank shape. [Figure 12] FIG. 10(a) is a plan view showing a claw-foot trench according to a third embodiment, and FIG. 10(b) is a side view showing the claw-foot trench according to the third embodiment. [Figure 13] 12(b) is a view seen from the direction of arrow A in FIG. [Figure 14] FIG. 10 is a rear perspective view of a claw foot trench according to a third embodiment. [Figure 15] 10A and 10B are side views showing the state in which the body of the claw foot trench according to the third embodiment is rotated upward and downward, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0023] [First embodiment] A clawfoot trench 2 according to a first embodiment of the present invention will be described below with reference to the drawings.

[0024] As shown in FIG. 1, the claw foot trench 2 includes a head 4 and a body 8 rotatably connected to a base end 4 a of the head 4 via a hinge mechanism 6 .

[0025] The head 4 has a tightening port 10 into which the object to be tightened, such as a bolt or nut, is fitted. The tightening port 10 is annular, and has corners 12 on its inner circumferential surface, the number of which is a multiple of six, or twelve in this embodiment.

[0026] The body 8 is a flat member and is provided with mounting holes 14 into which the connection ends of various auxiliary handles are fitted. The mounting holes 14 are through holes drilled in the thickness direction of the body 8, and at least two mounting holes 14 are provided. In this embodiment, a first mounting hole 16 and a second mounting hole 18 are provided.

[0027] First, as is clear from Fig. 1(a), the first mounting hole 16 is a circular through-hole. An annular protrusion 20 is provided along the periphery of the first mounting hole 16. The protrusion 20 is partially provided with notches 22, 22.

[0028] This first mounting hole 16 is compatible with various auxiliary handles having a connecting end portion whose cross section is a circular protrusion. Such a circular protruding connecting end portion 32 may be provided with a stopper 31 that protrudes radially for alignment or to prevent inadvertent rotation, and this stopper 31 is inserted into the notches 22, 22.

[0029] An example of an auxiliary handle having the above-described circular protruding connection end 32 is a torque wrench 30 as shown in FIG.

[0030] 1(a), the second mounting hole 18 is a rectangular through-hole. This second mounting hole 18 is compatible with auxiliary handles having a connecting end portion whose cross section is a rectangular protrusion, among various auxiliary handles.

[0031] An example of an auxiliary handle having a connection end with a square protrusion as described above is the ratchet handle 40. Furthermore, many of the connection ends of extension rods 34 also have square protrusions, so it is possible to connect the ratchet handle 40 or the like via the extension rod 34.

[0032] The hinge mechanism 6 is formed by combining the ends of the head 4 and the body 8. More specifically, as shown in FIG. 1( a), a protruding portion 41 having a convex shape in a plan view is formed at the base end 4a of the head 4, and a recessed portion 81 having a concave shape in a plan view is formed at the base end 8a of the body 8, and these protruding portion 41 and recessed portion 81 are combined together. As shown in FIG. 1( b), a through-hole 82 is formed in the protruding portion 41 and the recessed portion 81, communicating with each other from the side, and a hinge pin 84 is inserted through this through-hole 82. As a result, as shown in FIGS. 2( a) and 2(b), the body 8 is rotatable relative to the head 4 around the hinge pin 84. Here, the ends of the protruding portion 41 and the recessed portion 81 have a rounded shape in a side view, so the head 4 and the body 8 do not interfere with each other during rotation.

[0033] Next, a method of using the clawfoot trench 2 according to the first embodiment will be described. First, when using the torque wrench 30, as shown in Figure 3, the body 8 of the claw-foot wrench 2 is rotated relative to the head 4 so that the head 4 and body 8 are perpendicular to each other. At this time, the body 8 is rotated so that the annular protrusion 20 protrudes rearward, that is, on the side opposite the head 4. In this state, the connecting end 32 of the torque wrench 30 is inserted into the circular first mounting hole 16. This attaches the claw-foot wrench 2 to the torque wrench 30, as shown in Figure 4. The target bolt is fitted into the tightening mouth 10 of the claw-foot wrench 2 attached to the torque wrench 30, and the tightening torque of the target bolt can be managed by operating the torque wrench 30.

[0034] Next, when using the extension rod 34, the body 8 of the claw foot trench 2 is rotated relative to the head 4 so that the head 4 and body 8 are perpendicular to each other, as shown in Figure 5. At this time, the body 8 is rotated so that the annular protrusion 20 protrudes forward, that is, toward the head 4. In this state, the connecting end 36 of the extension rod 34 is inserted into the rectangular second mounting hole 18. This attaches the claw foot trench 2 to the extension rod 34, as shown in Figure 5.

[0035] 6, the claw foot wrench 2 can be attached to a spinner handle 38, which has a relatively long shaft, as a type of auxiliary handle. The connecting end of this spinner handle 38 is also inserted into the second mounting hole 18.

[0036] Second mounting hole portion 18 is provided at the end of body 8 at a position away from head 4. For this reason, as is clear from Figure 6, when body 8 is rotated so as to be perpendicular to head 4, the position of spinner handle 38 becomes higher than the position of head 4. Therefore, in the case of a bolt 62 located beyond a vertically cranked portion 60 that cannot be reached with a box wrench 70 as shown in Figure 10, a claw-foot wrench 2 attached to spinner handle 38 can easily reach said bolt 62, as shown in Figure 6, and said bolt 62 can be easily tightened.

[0037] Next, when using the ratchet handle 40, the head 4 and body 8 of the claw-foot wrench 2 are placed flat, and the connecting end of the ratchet handle 40 is inserted into the second mounting hole 18 of the body 8 in this state. This places the claw-foot wrench 2 attached to the ratchet handle 40, as shown in FIG. 7. At this time, the axis of the claw-foot wrench 2 and the axis of the ratchet handle 40 are positioned approximately perpendicular to each other. For a bolt 66 located beyond a horizontally cranked portion 64 that cannot be reached with a box wrench 70, as shown in FIG. 11, the claw-foot wrench 2 attached to the ratchet handle 40 in the above-described positional relationship can easily reach the bolt 66, as shown in FIG. 8, and easily tighten the bolt 66.

[0038] [Second embodiment] A claw foot trench 50 according to a second embodiment of the present invention will be described below with reference to the drawings. In the description of the second embodiment, the same components as those of the claw foot trench 2 according to the first embodiment already described will be given the same reference numerals and detailed description thereof will be omitted.

[0039] As shown in Fig. 9, the claw foot wrench 50 according to the second embodiment has a head 52 with a tightening jaw 54 of an open-ended type, with the tip open. Specifically, the head 52 has a first claw 56 and a second claw 58 positioned opposite the first claw 56. The tightening jaw 54 is formed in a U-shape between the first claw 56 and the second claw 58. Then, bolts and nuts can be clamped and fitted into the tightening jaw 54 to perform tightening work.

[0040] The claw foot trench 50 of the second embodiment differs only in the shape of the tightening mouth portion 54 from the tightening mouth portion 10 of the claw foot trench 2 of the first embodiment, and the other configurations, i.e., the configurations of the body 8 and hinge mechanism 6, are the same.

[0041] [Third embodiment] A claw foot trench 90 according to a third embodiment of the present invention will be described below with reference to the drawings. In the description of the third embodiment, the same components as those of the claw foot trench 2 according to the first embodiment already described will be assigned the same reference numerals, and detailed description thereof will be omitted.

[0042] 12, the claw foot trench 90 differs from the first embodiment only in the shape of the body 92, but other configurations, that is, the configurations of the head 4 and hinge mechanism 6, are the same as those of the first embodiment. In the following description, the head 4 side will be defined as the front direction, the body 92 side will be defined as the rear direction, the thickness direction of the head 4 will be defined as the up-down direction, and the width direction of the head 4 will be defined as the left-right direction.

[0043] The body 92 has a rectangular parallelepiped shape that is thicker than the head 4, and has a front end surface 94 on which the hinge mechanism 6 is integrally formed and which is located on the head 4 side, a rear end surface 96 opposite the front end surface 94, and an upper end surface 98, a lower end surface 100, a left side surface 102, and a right side surface 104 that extend between the front end surface 94 and the rear end surface 96, respectively.

[0044] The body 92 is provided with a first mounting hole 106 and a second mounting hole 108 into which the connecting ends of various auxiliary handles are fitted. 12(a) and 12(b), FIG. 13 which is a view from the direction of arrow A in FIG. 12(b), and FIG. 14 which is a perspective view from the rear, the first mounting hole 106 is a circular through-hole. Among various auxiliary handles, this first mounting hole 106 corresponds to an auxiliary handle having a connection end whose cross section is a circular protrusion.

[0045] Here, the periphery of the first mounting hole 106 on the rear end surface 96 of the body 92 is chamfered diagonally toward the inside of the first mounting hole 106 to form an inclined surface 110. This makes it easier to receive the connection end of the auxiliary handle into the first mounting hole 106. In addition, the rear end surface 96 of the body 92 is provided with two recessed grooves 112, 112 extending from the periphery of the first mounting hole 106. These recessed grooves 112, 112 face each other and exist on a straight line. In some cases, the connection end 32 of the circular protrusion of the auxiliary handle is provided with a stopper 31 that protrudes radially outward (see torque wrench 30 in Figure 4), and this stopper 31 is inserted into the recessed grooves 112, 112.

[0046] 12(a), (b), and 13, the second mounting hole 108 is a through-hole with a square cross section that extends from the upper end surface 98 to the lower end surface 100 of the body 92. This second mounting hole 108 is compatible with auxiliary handles having a connecting end whose cross section is a square protrusion, among various auxiliary handles.

[0047] 12(a) and 12(b), the first mounting hole 106 extends from the rear end surface 96 of the body 92 to the second mounting hole 108. In other words, the first mounting hole 106 communicates with the second mounting hole 108.

[0048] 12 to 14, the corners between the rear end face 96 and the left side face 102 and the corners between the rear end face 96 and the right side face 104 of the head 92 are chamfered to form chamfered portions 111. By chamfering the corners in this manner, troubles caused by contact with other parts and injuries to the operator can be prevented.

[0049] The body 92 is rotatable relative to the head 4 around the hinge pin 84 by the hinge mechanism 6, as shown in FIGS. 15(a) and 15(b). In the claw foot trench 90 of the third embodiment, the second mounting hole portion 108 extends from the upper end surface 98 to the lower end surface 100 and is open on both end surfaces, so that the connecting end of the auxiliary handle can be inserted from either the upper end surface 98 side or the lower end surface 100 side.

[0050] In the claw foot trench 90 according to the third embodiment, the first mounting hole 106 and the second mounting hole 108 are positioned in a positional relationship in the body 92 such that the axis of the first mounting hole 106 and the axis of the second mounting hole 108 are perpendicular to each other, so the first mounting hole 106 can be disposed close to the second mounting hole 108. Therefore, unlike the claw foot trench 2 according to the first embodiment, it is not necessary to align the first mounting hole 16 and the second mounting hole 18 in parallel in the longitudinal direction of the body 8. Therefore, the claw foot trench 90 according to the third embodiment can have a shorter overall length than the claw foot trench 2 according to the first embodiment, thereby achieving a more compact design.

[0051] As described above, the claw foot wrench of the present invention has multiple mounting holes, such as the circular first mounting holes 16, 106 and the square second mounting holes 18, 108, making it compatible with various auxiliary handles and extension rods and highly versatile. It also has a hinge mechanism, and by orthogonally connecting the head and body, it can be used in narrow, crank-shaped spaces.

[0052] The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, although the above-described embodiment uses two types of mounting holes, three or more types may be used, which will further expand the versatility of the present invention.

[0053] Furthermore, the auxiliary handle that can be attached to the claw-foot wrench of the present invention is not limited to a spinner handle, ratchet handle, extension rod, torque wrench, etc., but can be any auxiliary handle that has been used in conventional claw-foot wrenches. [Explanation of symbols]

[0054] 2 Clawfoot Wrench 4 heads 6 Hinge mechanism 8 Body 10 Fastening mouth 12 Corner 14 Mounting hole 16 First mounting hole 18 Second mounting hole 20 Protrusion 30 Torque wrench 32 Connection end 34 Extension rod 36 Connection end 38 Spinner Handle 40 Ratchet Handle 41 Convex part 50 Clawfoot Wrench 52 heads 54 Fastening mouth 56 First claw 58 Second claw 60 Vertical crank bend 62 volts 64 Horizontal crank bend 66 volts 70 Open-end wrench 81 Recessed part 82 Through hole 84 Hinge pin 92 heads 106 First mounting hole 108 Second mounting hole

Claims

1. a head having a fastening opening into which an object to be fastened is fitted; a body rotatably connected to a base end of the head via a hinge mechanism, The claw foot wrench has at least two types of mounting holes in the body for fitting the connecting end of the auxiliary handle.

2. The mounting hole portion includes at least a first mounting hole portion and a second mounting hole portion, The first mounting hole portion has a circular shape and corresponds to the auxiliary handle, the connecting end of which is a circular protrusion, 2. The claw foot wrench according to claim 1, wherein the second mounting hole portion is rectangular and corresponds to the auxiliary handle, the connecting end of which is a rectangular protrusion.

3. 2. The claw foot trench according to claim 1, wherein the tightening jaw portion is annular and has corners on its inner circumferential surface that are a multiple of six.

4. 2. The claw foot trench according to claim 1, wherein the clamping jaw portion is an open-ended U-shaped portion with an open tip.

5. The body has a rectangular parallelepiped shape that is thicker than the head, the first mounting hole portion is a circular through-hole provided in a rear end surface of the body positioned on the opposite side from the head, 3. The claw foot trench according to claim 2, wherein the second mounting hole is a rectangular through-hole extending from an upper end surface to a lower end surface of the body perpendicular to the rear end surface.

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