In-vehicle tool

Abstract

To provide an on-vehicle tool capable of suppressing biting.SOLUTION: The second shaft member 12 is formed in a tubular shape having an inside diameter larger than an outside diameter of the first shaft member 11, includes two second plane 21a portions that are formed on an inner peripheral surface of the second shaft member 12 at one end of the second shaft member 12 and that face the two first plane 21a portions, and the first shaft member 11 is inserted into the second shaft member 12. 31a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an on-board tool. [Background technology]

[0002] Vehicles such as trucks are equipped with spare tires. Such spare tires are held in a spare tire carrier mounted on the chassis of the vehicle. The spare tire carrier includes, for example, a chain, a bracket attached to one end of the chain, and a hoisting device that winds up the chain. The spare tire carrier allows the bracket to be raised and lowered, allowing the spare tire to be attached or detached, by rotating the hoisting device with an on-board tool that serves as a spare tire handle.

[0003] Here, the on-board tools used to operate the hoisting device are stored in a space such as the cabin. The on-board tools need to be a certain length in order to operate the spare tire carrier located under the vehicle, but the space available in the vehicle for storing the on-board tools is limited. Furthermore, as the number of additional devices installed in the cabin increases, it becomes difficult to secure space for storing the on-board tools. Therefore, in order to reduce the storage space required for the on-board tools, a technique is known in which the on-board tools are divided into parts so that they can be stored as a single unit, and the divided parts are connected when in use (see, for example, Patent Document 1).

[0004] Such an on-board tool includes, for example, a rod-shaped first shaft member and a cylindrical second shaft member. When the on-board tool is mounted on a vehicle, the first shaft member and the second shaft member are disassembled into two pieces, and the first shaft member is housed in the second shaft member and stored in a toolbox or the like. When the on-board tool is used, the ends of the first shaft member and the second shaft member are connected to each other to assemble the on-board tool as a whole. In order to prevent the first shaft member and the second shaft member from rotating relative to each other, i.e., causing a so-called freewheeling, at the connected portion, a flat surface facing each other is formed on each of the connected ends of the first shaft member and the second shaft member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-057435 Summary of the Invention [Problem to be solved by the invention]

[0006] When the spare tire carrier is rotated, a rotational force is applied to the connecting portion of the first and second shaft members, causing the flat surfaces of the first and second shaft members to come into contact with each other. At this time, the load is concentrated at one point where the first and second shaft members contact each other, which may cause the first and second shaft members to become jammed and become unable to be removed.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an on-board tool that can prevent jamming. [Means for solving the problem]

[0008] According to one aspect of the present invention, an on-board tool comprises a first shaft member including two first flat surfaces formed on an outer peripheral surface of one end, and a second shaft member formed in a cylindrical shape with an inner diameter larger than the outer diameter of the first shaft member, including two second flat surfaces formed on an inner peripheral surface of one end that face the two first flat surfaces, and into which the first shaft member is inserted. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an on-board tool that can suppress jamming. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing a configuration of an on-board tool according to an embodiment of the present invention, in a state where a first shaft member and a second shaft member are connected to each other. [Figure 2] FIG. 3 is a perspective view showing the configuration of a first shaft member and a second shaft member of the on-board tool in a separated state. [Figure 3]FIG. 4 is a perspective view showing the configuration of the on-board tool in a state where the first shaft member is housed in the second shaft member. [Figure 4] 10 is a perspective view showing the configuration of the on-board tool in a state where the first shaft member housed in the second shaft member is being removed from the second shaft member. FIG. [Figure 5] FIG. 3 is a cross-sectional view showing a cross section of the connected end portion of the first shaft member and the second shaft member. [Figure 6] 4 is a cross-sectional view showing the configuration of the end portion of the on-board tool in a state where the first shaft member is housed in the second shaft member. FIG. [Figure 7] FIG. 10 is a cross-sectional view showing another example of the configuration of the end portion of the on-board tool, in a state where the first shaft member is housed in the second shaft member. [Figure 8] 2 is a perspective view showing the configuration of a spare tire carrier using the on-board tool and an example of how to use the on-board tool. FIG. [Figure 9] FIG. 10 is a cross-sectional view showing a cross section of a connected end portion of a first shaft member and a second shaft member of an on-board tool according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0011] An on-board tool 1 according to one embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIGS. 1 to 4 are perspective views showing the configuration of the on-board tool 1 in different states. Specifically, FIG. 1 is a perspective view showing the configuration of the on-board tool 1 in a state where the first shaft member 11 and the second shaft member 12 are integrally connected, and FIG. 2 is a perspective view showing the configuration of the on-board tool 1 in a state where the first shaft member 11 and the second shaft member 12 are separated. FIG. 3 is a perspective view showing the configuration of the on-board tool 1 in a state where the first shaft member 11 is housed in the second shaft member 12, and FIG. 4 is a perspective view showing the configuration of the on-board tool 1 in a state where the first shaft member 11 is removed from the second shaft member 12.

[0012] FIG. 5 is a cross-sectional view showing a cross section of the connected end of the first shaft member 11 and the second shaft member 12, and FIG. 6 is a cross-sectional view showing the configuration of the end of the on-board tool 1 in a state where the first shaft member 11 is housed in the second shaft member 12. FIG. 7 is a cross-sectional view showing another example of the configuration of the end of the on-board tool 1 in a state where the first shaft member 11 is housed in the second shaft member 12. FIG. 8 is a perspective view showing the configuration of a spare tire carrier 200 that uses the on-board tool 1 and an example of how to use the on-board tool 1. FIG. 9 is a cross-sectional view showing a cross section of the connected end of the first shaft member 11A and the second shaft member 12A of an on-board tool 1A according to a comparative example.

[0013] As shown in FIG. 8, the on-board tool 1 is used to operate a spare tire carrier 200 provided on a vehicle 100 such as a truck.

[0014] First, the vehicle 100 and the spare tire carrier 200 will be described with reference to Figure 8. The vehicle 100 is, for example, a truck. The vehicle 100 has, for example, a chassis 101, and the spare tire carrier 200 is provided on the chassis 101, for example.

[0015] The spare tire carrier 200 is configured to be able to mount a spare tire 300. As a specific example, the spare tire carrier 200 includes a chain 201, a hoisting device 202 that can wind up and let out the chain 201, and a bracket 203 fixed to the lower end of the chain 201. The hoisting device 202 is configured to be rotatable by the on-board tool 1. The hoisting device 202 winds up the chain 201 when rotated in one direction, and lets out the chain 201 when rotated in the direction opposite to the winding direction of the chain 201. The hoisting device 202 is also configured to be able to restrict movement of the chain 201 when not being rotated, for example.

[0016] The bracket 203 is formed in a plate shape. For example, the bracket 203 is formed to be longer in at least one direction than the inner diameter of an opening 302 formed in the center of the wheel 301 of the spare tire 300. The bracket 203 is formed so that it can abut against the periphery of the opening 302 of the wheel 301 and the inner surface of the wheel 301 by being inserted into the wheel 301 of the spare tire 300 through the opening 302.

[0017] An example of holding a spare tire 300 on such a spare tire carrier 200 will be described. First, with the chain 201 fed out from the hoisting device 202, the bracket 203 is placed inside the wheel 301 of the spare tire 300. Then, a crank-shaped handle 2 for rotating the on-board tool 1 is connected to the on-board tool 1, and the on-board tool 1 is inserted into the hoisting device 202. Then, the handle 2 is operated to rotate the on-board tool 1, which in turn rotates the hoisting device 202, thereby winding up the chain 201. At this time, the bracket 203 comes into contact with the inner surface around the opening 302 of the wheel 301, and as the chain 201 is wound up, the spare tire 300 held on the upper surface of the bracket 203 rises. Then, by rotating the on-board tool 1 until the outer surface (upper surface) of the spare tire 300 abuts against the hoisting device 202, the spare tire 300 is sandwiched and held between the hoisting device 202 and the bracket 203. Through this process, the spare tire 300 is held by the spare tire carrier 200.

[0018] An example of removing the spare tire 300 from the spare tire carrier 200 will be described. First, the handle 2 is operated to rotate the on-board tool 1 in the direction in which the hoisting device 202 unwinds the chain 201, thereby unwinding the chain 201. Then, the hoisting device 202 is operated to unwind the chain 201 until the spare tire 300 touches the ground. This separates the bracket 203 from the wheel 301, allowing the bracket 203 to be removed from the opening 302 of the wheel 301. Through these steps, the spare tire 300 can be held on the spare tire carrier 200, and the spare tire 300 held in the spare tire carrier 200 can be removed from the spare tire carrier 200.

[0019] Next, a description will be given of the on-board tool 1 for operating such a spare tire carrier 200. The on-board tool 1 is a spare tire handle that, together with the handle 2, rotates the spare tire carrier 200.

[0020] As shown in FIGS. 1 to 4, the on-board tool 1 includes a rod-shaped first shaft member 11 and a cylindrical second shaft member 12. As shown in FIG. 2, the on-board tool 1 is separable into the first shaft member 11 and the second shaft member, and as shown in FIG. 1, the first shaft member 11 and the second shaft member 12 can be connected together. As shown in FIG. 3, the on-board tool 1 is configured so that the first shaft member 11 can be housed inside the second shaft member 12, and so that the first shaft member 11 housed in the second shaft member 12 can be removed from the second shaft member 12, as shown in FIG. 4. In FIG. 4, the arrow indicates the direction in which the first shaft member 11 housed in the second shaft member 12 is removed.

[0021] The first shaft member 11 is formed in a cylindrical shape that is long in the axial direction. The first shaft member 11 is a handle that operates the hoisting device 202 by rotating. One end of the first shaft member 11 forms a first connecting portion 21 that is connected to the second shaft member 12. The other end of the first shaft member 11 has an engaging portion 22 that engages with the hoisting device 202 in the rotational direction.

[0022] The first connecting portion 21 is formed by a plurality of first flat surfaces 21a formed on the outer peripheral surface of one end of the first shaft member 11. For example, the main surface of the first flat surface 21a extends along the axial direction of the first shaft member 11. Two or more first flat surfaces 21a are provided. As a specific example, two first flat surfaces 21a are provided at symmetrical positions in the circumferential direction of the first connecting portion 21. For example, the two first flat surfaces 21a are parallel to each other. Note that the number of the plurality of first flat surfaces 21a may be three or more, and a configuration may be adopted in which multiple pairs of two first flat surfaces 21a are provided.

[0023] The width between the outer surfaces of the two first flat surfaces 21a (the distance between the first flat surfaces 21a) is smaller than the outer diameter of the first shaft member 11 at a portion other than the first connecting portion 21. In this embodiment, the two first flat surfaces 21a are parallel to each other, and therefore the width between the outer surfaces of the two first flat surfaces 21a is the distance between the two opposing first flat surfaces 21a. Note that the two opposing first flat surfaces 21a refer to the two first flat surfaces 21a that are aligned in one direction along the radial direction of the first shaft member 11.

[0024] Note that even when the two first planes 21a are not parallel but are formed at a predetermined angle, the width between the outer surfaces of the two first planes 21a refers to the distance between two first planes 21a aligned in one direction along the radial direction of the first shaft member 11. When there are three or more first planes 21a, the width between the outer surfaces of the two first planes 21a refers to the distance between two paired first planes 21a aligned in one direction along the radial direction of the first shaft member 11 among the three or more first planes 21a. As such, the multiple first planes 21a are arranged at a distance such that the inscribed circle of the multiple first planes 21a is smaller than the outer peripheral surface of the first shaft member 11. That is, the multiple first planes 21a are arranged closer to the center of the first shaft member 11 than the outer peripheral surface of the first shaft member 11. The two first planes 21a are formed, for example, by cutting the outer periphery of one end of the first shaft member 11 into a flat shape by cutting or the like.

[0025] The first connecting portion 21 also has, for example, chamfered chamfered surfaces 21b at the ridges between the outer peripheral surface and each of the first flat surfaces 21a. The chamfered surfaces 21b are formed, for example, in a flat shape.

[0026] The engaging portion 22 is formed by two protrusions 22a formed on the other end of the first shaft member 11. For example, the two protrusions 22a are provided at symmetrical positions in the circumferential direction of the first shaft member 11. The engaging portion 22 is formed so as to be able to engage with, for example, an operating part of the hoisting device 202 in the circumferential direction. Note that the engaging portion 22 may be formed so as to be able to engage with a rotation operating part of a jack mounted on the vehicle 100 in addition to the hoisting device 202.

[0027] For example, the two first flat surfaces 21a and the two protrusions 22a are arranged at positions offset by 90° in the circumferential direction of the first shaft member 11.

[0028] The second shaft member 12 is formed in the shape of a hollow cylinder that is long in the axial direction. The second shaft member 12 is a circular pipe. The second shaft member 12 rotates the first shaft member 11 connected thereto when rotated by the handle 2. One end of the second shaft member 12 forms a second connecting portion 31 that is connected to the first shaft member 11. The other end of the second shaft member 12 has an engaged portion 32 that engages with the hoisting device 202 in the rotational direction.

[0029] The second connecting portion 31 is formed so as to be connectable to the first connecting portion 21 of the first shaft member 11. The second connecting portion 31 is formed so that the first connecting portion 21 of the first shaft member 11 can be inserted therein and so as to restrict circumferential movement of the first connecting portion 21. Furthermore, the second connecting portion 31 is formed so as to be connectable to, for example, the handle 2.

[0030] The second connecting portion 31 is formed by a plurality of second planes 31a formed on the inner circumferential surface of one end of the second shaft member 12. The main surface of the second plane 31a extends, for example, along the axial direction of the second shaft member 12. Two or more second planes 31a are provided. The second planes 31a are formed so as to be able to face the first planes 21a. As a specific example, two second planes 31a are provided at symmetrical positions in the circumferential direction of the second connecting portion 31. The two second planes 31a are formed in the same positional relationship in the circumferential direction as the two first planes 21a. The two second planes 31a are parallel. Note that the number of the second planes 31a may be the same as the number of the first planes 21a, and they may have the same positional relationship in the circumferential direction. Therefore, the number of the second planes 31a may be three or more, or a configuration may be provided in which multiple pairs of two second planes 31a are provided.

[0031] The width between the inner surfaces of the two second flat surfaces 31a (the distance between the two second flat surfaces 31a) is smaller than the inner diameter of the second shaft member 12 at a portion other than the second connecting portion 31. In this embodiment, the two second flat surfaces 31a are parallel to each other, and therefore the width between the inner surfaces of the two second flat surfaces 31a is the distance between the two opposing second flat surfaces 31a. Note that the two opposing second flat surfaces 31a refer to the two second flat surfaces 31a aligned in one direction along the radial direction of the second shaft member 12.

[0032] Note that even when the two second planes 31a are not parallel but are formed at a predetermined angle, the width between the inner surfaces of the two second planes 31a refers to the distance between two second planes 31a aligned in one direction along the radial direction of the second shaft member 12. When there are three or more second planes 31a, the width between the inner surfaces of the two second planes 31a refers to the distance between two paired second planes 31a aligned in one direction along the radial direction of the second shaft member 12 among the three or more second planes 31a. In this way, the multiple second planes 31a are arranged at a distance such that the inscribed circle of the multiple second planes 31a is smaller than the inner circumferential surface of the second shaft member 12. In other words, the multiple second planes 31a are arranged closer to the center of the second shaft member 12 than the inner circumferential surface of the second shaft member 12.

[0033] For example, two second flat surfaces 31a are formed on the inner circumferential surface of the second connecting portion 31 by recessing the outer periphery of one end of the cylindrical second connecting portion 31 into a flat shape. For example, the second flat surface 31a is formed by processing one end of the second shaft member 12 by press working or the like. The distance between the two opposing second flat surfaces 31a is greater than the distance between the two opposing first flat surfaces 21a and is smaller than the outer diameter of the first shaft member 11 excluding the first connecting portion 21. The distance between the two opposing second flat surfaces 31a is formed greater than the distance between the two opposing first flat surfaces 21a, and when the first shaft member 11 and the second shaft member 12 rotate relative to each other in the circumferential direction, the first flat surfaces 21a and the second flat surfaces 31a abut at two locations. Therefore, when the first connecting portion 21 is inserted into the second connecting portion 31, the first flat surfaces 21a and the second flat surfaces 31a face each other.

[0034] The engaged portion 32 is formed by two slits 32a formed on the other end of the second shaft member 12. For example, the two slits 32a are provided at symmetrical positions in the circumferential direction of the second shaft member 12. The engaged portion 32 is formed to be able to engage with the engaging portion 22 of the first shaft member 11 in the circumferential direction. For example, the slits 32a are grooves recessed in the axial direction from the end face of the second shaft member 12, and are formed to be able to accommodate the protrusions 22a of the engaging portion 22. The two second flat surfaces 31a and the two slits 32a are arranged at positions shifted by 90° in the circumferential direction of the second shaft member 12. In other words, the two second flat surfaces 31a and the two slits 32a are set to have the same positional relationship in the circumferential direction as the two first flat surfaces 21a and the two protrusions 22a. As a result, the two first flat surfaces 21a and the two second flat surfaces 31a can face each other, and the two protrusions 22a and the two slits 32a can be engaged with each other.

[0035] Furthermore, the outer peripheral surface shape of the first shaft member 11 is formed slightly smaller than the inner peripheral surface shape of the second shaft member 12. As a result, the first shaft member 11 is formed so as to be insertable into the second shaft member 12, and the first connecting portion 21 is formed so as to be insertable into the second connecting portion 31. Furthermore, since the width between the inner surfaces of the two second flat surfaces 31a of the second connecting portion 31 of the second shaft member 12 is smaller than the outer diameter of the first shaft member 11 excluding the first connecting portion 21, after the first connecting portion 21 and the second connecting portion 31 are connected, the first connecting portion 21 is restricted from moving beyond the second connecting portion 31.

[0036] Furthermore, in the on-board tool 1, the two first flat surfaces 21a of the first shaft member 11 have different axial lengths, or the two second flat surfaces 31a of the second shaft member 12 have different axial lengths. Specifically, as shown in FIG. 6 , the axial lengths of the two first flat surfaces 21a are set to be different lengths, and the axial lengths of the two second flat surfaces 31a are set to be the same length. As a result, as shown by "S1" in FIG. 6 , the positions of the ends of the two first flat surfaces 21a on the other end side of the first shaft member 11 are different in the axial direction. Here, the ends of the first flat surfaces 21a on the other end side of the first shaft member 11 refer to the ends of the first flat surfaces 21a on the opposite side of the tip end side of the first shaft member 11 from the first flat surfaces 21a. Furthermore, the positions of the ends of the two second flat surfaces 31a on the other end side of the second shaft member 12 are the same in the axial direction. Here, the end portion of the second plane 31a on the other end side of the second shaft member 12 refers to the end portion of the second plane 31a opposite the tip side of the second shaft member 12 on the second plane 31a in the axial direction, among both end portions of the second plane 31a.

[0037] As another example, as shown in Fig. 7, the axial lengths of the two first flat surfaces 21a are set to be the same, and the axial lengths of the two second flat surfaces 31a are set to be different, so that the positions of the ends of the two first flat surfaces 21a opposite to the tip side of the first shaft member 11 are the same in the axial direction, and the positions of the ends of the two second flat surfaces 31a opposite to the tip side of the second shaft member 12 are different in the axial direction, as shown in Fig. 7.

[0038] In the on-board tool 1 configured in this manner, the outer peripheral surface shape of the first shaft member 11 is formed to be smaller than the inner peripheral surface shape of the second shaft member 12. Furthermore, the first connecting portion 21 of the first shaft member 11 and the second connecting portion 31 of the second shaft member 12 each have the same number of flat surfaces 21a, 31a that are positioned in the same circumferential direction. In this embodiment, the first connecting portion 21 has two parallel flat surfaces 21a, and the second connecting portion 31 has two parallel flat surfaces 31a. Furthermore, the engaging portion 22 of the first shaft member 11 and the engaged portion 32 of the second shaft member 12 are formed to be engageable with each other.

[0039] 1, the on-board tool 1 can couple the first shaft member 11 and the second shaft member 12 by inserting the first connecting portion 21 into the second connecting portion 31. When the first shaft member 11 and the second shaft member 12 are coupled, the two flat surfaces 21a of the first connecting portion 21 and the two flat surfaces 31a of the second connecting portion 31 face each other, as shown in FIG. 5. Therefore, when the first connecting portion 21 and the second connecting portion 31 are coupled, the on-board tool 1 can restrict the first shaft member 11 and the second shaft member 12 from rotating relative to each other in the circumferential direction.

[0040] Furthermore, when restricting the relative rotational movement of the first shaft member 11 and the second shaft member 12 in the circumferential direction, the first shaft member 11 and the second shaft member 12 abut at locations equal to the number of flat surfaces 21a, 31a. In the example shown in FIG. 5 , in which the first shaft member 11 has two first flat surfaces 21a and the second shaft member 12 has two second flat surfaces 31a, a rotational load is received at, for example, two locations indicated by circles in FIG. 5 . By receiving the load generated by the relative rotation of the first shaft member 11 and the second shaft member 12 at multiple locations, the load generated during the rotation of the first shaft member 11 and the second shaft member 12 can be dispersed. Therefore, the on-board tool 1 can prevent jamming of the first shaft member 11 and the second shaft member 12 due to the load concentrating at one location.

[0041] This effect will be described more specifically with reference to FIGS. 5 and 9. The on-board tool 1A of the comparative example shown in FIG. 9 has one first flat surface 21a on the first connecting portion 21A of the first shaft member 11A and one second flat surface 31a on the second connecting portion 31A of the second shaft member 12A. In the configuration of the on-board tool 1A of the comparative example, when the first shaft member 11A and the second shaft member 12A rotate relative to each other, the first flat surface 21a and the second flat surface 31a abut at one location. Therefore, a load generated by the relative rotation of the first shaft member 11A and the second shaft member 12A is concentrated and applied to the one location where the first flat surface 21a and the second flat surface 31a abut. Therefore, there is a risk of jamming in the first shaft member 11A and the second shaft member 12A of the comparative example. In contrast, the first shaft member 11 and the second shaft member 12 of the on-board tool 1 of the embodiment have at least two first flat surfaces 21a and at least two second flat surfaces 31a, so that the load generated during rotation is received at at least two locations. Therefore, the first shaft member 11 and the second shaft member 12 can reduce the load applied to the contact portion per location, thereby suppressing jamming of the first shaft member 11 and the second shaft member 12.

[0042] 2, the on-board tool 1 is capable of separating the first shaft member 11 and the second shaft member 12, and is capable of accommodating the first shaft member 11 within the second shaft member 12 as shown in FIGS. 3 and 4. After accommodating the first shaft member 11 within the second shaft member 12, the first shaft member 11 can be prevented from falling off the second shaft member 12 by covering the end of the second shaft member 12 where the engaged portion 32 is formed with a cap 13 such as a rubber stopper.

[0043] In addition, in the on-board tool 1, the two first flat surfaces 21a have different axial lengths, as shown in Fig. 6, or the two second flat surfaces 31a have different axial lengths, as shown in Fig. 7. Therefore, when the first shaft member 11 is inserted into the second shaft member 12, only one of the ends of the two first flat surfaces 21a opposite to the tip side comes into contact with one of the ends of the two second flat surfaces 31a opposite to the tip side, as shown in Fig. 6 or 7. Therefore, when the first shaft member 11 is inserted into the second shaft member 12, it is possible to prevent the first connecting portion 21 of the first shaft member 11 and the second connecting portion 31 of the second shaft member 12 from getting caught.

[0044] Specifically, if the first shaft member 11 is a solid cylinder, the weight of the first shaft member 11 is relatively large. Therefore, when the first shaft member 11 is inserted into the second shaft member 12, the first shaft member 11 may be inserted forcefully into the second shaft member 12 due to its own weight. At this time, if the ends of the two first flat surfaces 21a opposite to the tip end side and the ends of the two second flat surfaces 31a opposite to the tip end side come into contact at two locations, there is a risk that the first shaft member 11 will become fitted into the second shaft member 12. Then, once the first shaft member 11 is fitted into the second shaft member 12, there is a risk that the first shaft member 11 will not be able to be removed from the second shaft member 12. However, in the example of this embodiment, when the first shaft member 11 is inserted into the second shaft member 12, the end of one of the first planes 21a abuts against the end of one of the second planes 31a, thereby preventing the first shaft member 11 from fitting into the second shaft member 12.

[0045] The first shaft member 11 also has a chamfered surface 21b formed by flatly chamfering the ridge between the outer peripheral surface and the first plane 21a. This chamfered surface 21b increases the contact area between the first connecting portion 21 of the first shaft member 11 and the inner peripheral surface of the second connecting portion 31 of the second shaft member 12. This allows the load applied to the first shaft member 11 and the second shaft member 12 to be dispersed.

[0046] As described above, according to the on-board tool 1 according to the embodiment, the configuration of the first connecting portion 21 and the second connecting portion 31 can prevent the first shaft member 11 and the second shaft member 12 from getting caught. Because the on-board tool 1 can prevent the first shaft member 11 and the second shaft member 12 from getting caught, the assembly of the first shaft member 11 and the second shaft member 12 becomes easy.

[0047] The present invention is not limited to the above-described embodiment. For example, in the above-described example, the on-board tool 1 is configured such that the two first flat surfaces 21a have different axial lengths as shown in FIG. 6, or the two second flat surfaces 31a have different axial lengths as shown in FIG. 7. However, the on-board tool 1 may be configured such that all the first flat surfaces 21a and all the second flat surfaces 31a do not come into contact with each other when the first shaft member 11 is housed in the second shaft member 12. Therefore, as another example, the two first flat surfaces 21a may have different axial lengths, and the two second flat surfaces 31a may have different axial lengths, as long as the lengths are such that all the first flat surfaces 21a and all the second flat surfaces 31a do not come into contact with each other.

[0048] However, in order to avoid a reduction in the fitting allowance when using the on-board tool 1 compared to the conventional configuration, it is preferable to configure the two first flat surfaces 21a to have different axial lengths as shown in FIG.

[0049] That is, the present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. [Explanation of symbols]

[0050] 1...vehicle-mounted tool, 2...handle, 2...handle, 11...first shaft member, 12...second shaft member, 13...cap, 21...first connecting portion, 21a...first flat surface, 21b...cut surface, 22...engaging portion, 22a...protrusion, 31...second connecting portion, 31a...second flat surface, 32...engaged portion, 32a...slit, 100...vehicle, 101...chassis, 200...spare tire carrier, 201...chain, 202...hoisting device, 203...bracket, 300...spare tire, 301...wheel, 302...opening.

Claims

1. a first shaft member including two first flat surfaces formed on an outer peripheral surface of one end thereof; a second shaft member formed in a cylindrical shape with an inner diameter larger than an outer diameter of the first shaft member, including two second flat surfaces formed on an inner circumferential surface of one end thereof, the second flat surfaces facing the two first flat surfaces, and into which the first shaft member is inserted; An on-board tool comprising:

2. the two first planes are parallel; The vehicle-mounted tool of claim 1 , wherein the two second planes are parallel.

3. The on-board tool according to claim 1 , wherein the ends of the two first flat surfaces on the other end side of the first shaft member are located at different positions in the axial direction of the first shaft member.

4. The on-board tool according to claim 1 , wherein the ends of the two second flat surfaces on the other end side of the second shaft member are located at different positions in the axial direction of the second shaft member.

5. Three or more first planes are provided, The on-board tool according to claim 1 , wherein the number of the second flat surfaces is the same as the number of the first flat surfaces.

Images