JP3245155U - hitch member - Google Patents

Abstract

An object of the present invention is to provide a hitch member that can withstand higher loads and, as a result, dramatically improves the safety factor. [Solution] A hitch member for towing various trailers at the rear of a car body, which includes two brackets 3a and 3b vertically attached to the rear of the car body, and a member part 1 of the hitch member joined between the two brackets. However, both ends of the member part have rectangular plates 2a, 2b formed in a rectangular shape, and square recesses 5a, 5b in which the bracket surfaces facing the square plates fit the square plates. [Selection diagram] Figure 1

Description

The present invention relates to a hitch member, which is the essential part of a device for connecting a trailer carrying a fishing boat, etc., a camping trailer, etc. to a vehicle towing it.

Regarding this type of hitch member, for example, a "traction device" disclosed in Japanese Patent Laid-Open No. 2002-220071 is known.
The disclosure of Japanese Patent Application Laid-open No. 2002-220071 relates to the title of the invention, ``Tracking device for small trailers,'' and states, ``Conventionally, the member part of the traction device for small trailers in automobiles has been either square pipes or round pipes... In order to solve the problems of inventions such as ``It is necessary to have more longitudinal load than vertical load, and it is necessary to use more material than necessary to satisfy both, which results in heavy weight and a rugged appearance.'' (Refer to Paragraph No. 0002 of the specification of the same publication). By adopting the structure of ``Using the traction device'' (refer to the claims of the same publication), it has the effect of ``reducing the weight of the traction device and at the same time making it possible to create a traction device that is much more beautiful than conventional ones'' ( (See Paragraph No. 0012 of the specification of the same publication).

FIG. 4 is a perspective view of a traction device in which the disclosed invention described in FIG. 1 attached to JP-A No. 2002-220071 is implemented. In FIG. Part 103 is a hitch ball (in order to clarify that it is a prior art, the applicant has changed the number to three digits in the explanation).
Regarding this type of towing device (hitch member), the applicant of the present application has manufactured and installed a hitch member for the Jimny ("Jimny" is a registered trademark, the same hereinafter) manufactured by the automobile company Suzuki Motor Corporation.

FIG. 5 is a schematic diagram of a conventional hitch member for a Suzuki Jimny vehicle manufactured and used by the applicant. In FIG. 5, reference numerals 110a and 110b are brackets to be attached to the Jimny vehicle body, 111 is a member portion of a conventional hitch member, 112a and 112b are joint portions with brackets 110a and 110b arranged at both ends of the hitch member 111, 113a, 113b, 113c, and 113d are connection bolts, and 114a, 114b, 114c, and 114d are connection nuts.
Further, FIG. 6 is a detailed enlarged view showing a conventional joint state between the bracket 110a and the joint portion 112a of the member portion 111 of the hitch member. A state in which the member portion 111 is joined at a joint portion 112a is shown.

As shown in FIGS. 5 and 6, a member portion 111 of a conventional hitch member for a Suzuki Jimny vehicle manufactured and used by the applicant of the present application has brackets 110a and 110b attached to the vehicle body, and joint portions 112a at both ends of the member portion 111. , 112b are both flat plate shapes, and both joint parts 112a and 112b are only joined flatly, so when a trailer (not shown) or the like is connected to the conventional hitch member part 111, the trailer When towing the hitch member 111 from the hitch ball through the ball mount, vertical loads, horizontal loads, and other complex loads are applied to the hitch member portion 111, and as a result, there is a concern that shearing loads will be applied to the joint bolts 113a, 113b, 113c, and 113d. be. Therefore, when heavy trailers such as boat trailers (not shown) or camping trailers (not shown) are frequently towed, there is a risk that the joint bolts 113a, 113b, 113c, and 113d may be sheared due to repeated loads. be.

Japanese Patent Application Publication No. 2002-220071 JP2008-302747A Publication No. 59-51603

In order to solve the above-mentioned conventional concerns and fears, the present invention provides a recess in one of the opposing surfaces of both ends of the member part of the bracket and hitch member, so that the end face of the member part of the hitch member is connected to the bracket surface. The hitch member has an uneven fitting structure and prevents shearing loads from being applied to the joint bolts between the hitch member and the bracket, thereby creating a hitch member that can withstand higher loads and, as a result, dramatically improves the safety factor. The purpose is to provide.

In order to solve the above problems, the invention of the hitch member according to claim 1 of the present application is a hitch member for towing various trailers at the rear of the vehicle body, which includes two brackets that are vertically attached to the rear of the vehicle body; and a member part of a hitch member that is joined between the hitch members, and both ends of the member part have a rectangular plate formed in a rectangular shape, and a bracket surface facing the square plate has a rectangular recess into which the rectangular plate is fitted. shall be.
Further, the invention according to claim 2 of the present application is such that, in the hitch member according to claim 1, the square plates at both ends of the member part and the bracket surface facing the square plates are square in place of the square recess into which the square plates are fitted. It is characterized by having a rectangular concave portion on the plate surface and a rectangular plate having a rectangular convex shape on the bracket surface opposite thereto.
Furthermore, in the hitch member according to claim 1 or 2, the invention according to claim 3 of the present application includes a rectangular plate at both ends of the member part, and a rectangular recess into which the bracket surface facing the rectangular plate is fitted into which the rectangular plate is fitted. Alternatively, the rectangular concave portion on the surface of the rectangular plate and the rectangular convex shaped rectangular plate on the surface of the bracket opposing thereto are characterized in that they are respectively elliptical or square-shaped convex portions and concave portions.

With the above structure, the bracket is provided with a recess, and the joints of both short hitch members with the brackets are made into a convex structure, and the recess is fitted into the structure to prevent shearing load from being applied to the joint bolt between the hitch member and the bracket. By doing so, it is possible to withstand higher loads, and as a result, the safety factor is dramatically improved.

FIG. 1 is a schematic diagram showing a first embodiment of a hitch member according to the present invention. FIG. 2 is an assembly diagram showing a state in which the rectangular convex portions at both ends of the hitch member 1 according to the first embodiment are fitted and joined to the rectangular concave portions of the joint surface of the bracket to be attached to the vehicle body. FIG. 3 is a schematic diagram showing a usage state in which a hitch ball is arranged on the hitch member 1 according to the first embodiment. FIG. 4 is a perspective view of a traction device in which the disclosed invention described in FIG. 1 attached to JP-A No. 2002-220071 is implemented. FIG. 5 is a schematic diagram of a conventional hitch member for a Suzuki Jimny vehicle manufactured and used by the applicant. FIG. 6 is a detailed enlarged view showing the joined state of a conventional hitch member in which both ends of the hitch member and the bracket attached to the vehicle body are made of flat plates.

An embodiment of the hitch member according to the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a hitch member, which is an embodiment of the hitch member according to the present invention.
In FIG. 1, reference numeral 1 denotes a member part of a hitch member according to Embodiment 1 of the present invention, 2a and 2b are rectangular plates at both ends of member part 1 of the hitch member according to Embodiment 1, and 3a and 3b are attached to the vehicle body. The brackets 4a and 4b are formed on the joint surfaces of the brackets 4a and 4b with the member portion 1 of the hitch member, and the rectangular recess frames into which the square plates are fitted, and 5a and 5b are the rectangular recesses on the opposing surfaces of the brackets. , 6a, 6b, 6c, and 6d are connection bolts, 7a, 7b, 7c, and 7d are connection nuts, and 8 is a hitch ball attachment port.
As shown in FIG. 1, the hitch member according to the first embodiment includes two brackets 3a and 3b that are vertically attached to the rear of the vehicle body, and a member portion 1 of the hitch member that is joined between these brackets 3a and 3b. It has a basic structure. At both ends of the member part 1, rectangular plates 2a, 2b are formed so as to be joined to the brackets 3a, 3b, and on the opposing surfaces of the brackets 3a, 3b, square plates 2a, 2b are formed. It is characterized by having a structure formed by respectively forming rectangular recesses 5a and 5b into which they are fitted.

FIG. 2 shows that rectangular convex portions 2a, 2 at both ends of the hitch member 1 according to the first embodiment are fitted into recesses 5a, 5b (not shown in FIG. 2) formed in the joint surfaces of brackets 3a, 3b. FIG. 3 is a joining diagram showing a state in which the parts are joined.
In the Jimny car used by the applicant, the brackets 3a and 3b shown in Figs. 1 and 2 are fixed to the ladder frame (not shown) of the car using bolts and nuts (not shown). Both brackets 3a and 3b are arranged so that their joint surfaces with the hitch member 1 according to the first embodiment are vertically engaged.

However, in order to attach brackets 3a and 3b that form vertical joint surfaces to a car model that does not have such a ladder frame structure, for example, a monocoque body, it is necessary to attach the brackets 3a and 3b to the car body with a monocoque body at an appropriate location (for example, a silencer, an exhaust port, etc.). It must be installed in a position that does not interfere with the joint surface and maintains both joint surfaces vertically. For this reason, the brackets 3a and 3b may be separate type brackets in which the mounting portions of the monocoque body are separated.

Although the rectangular convex portions 2a and 2b at both ends of the hitch member 1 according to the first embodiment are rectangular, they may have a shape that can withstand vibration and rotation, such as an ellipse, a triangle, or a star shape. The hitch member 1 according to the first embodiment has rectangular convex portions 2a, 2b at both ends, and recesses 4a, 4b on the opposing surfaces of the brackets 3a, 3b. Although the hitch member 1 is provided with recesses on both end faces thereof, and rectangular protrusions are provided on opposing faces of the brackets 3a and 3b, this may be an alternative.

FIG. 3 is a schematic diagram showing a usage state in which a hitch ball is arranged on the hitch member 1 according to the first embodiment. In FIG. 3, numeral 9 is a hitch ball, 10 is a ball mount, and the rest Components and locations having the same reference numerals as shown in FIGS. 1 and 2 are indicated by the same reference numerals.
As shown in FIG. 3, the hitch member 1 according to the first embodiment is, for example, a trailer (not shown) or a camping trailer (not shown) on which a fishing boat or the like is placed behind a Jimny car used by the applicant. These trailers are used for towing.

The present invention is used for a hitch member, which is the essential part of a device for connecting a trailer carrying a fishing boat, etc., a camping trailer, etc. to a car towing it.

1 Member portions of the hitch member of Example 1 according to the present invention 2a, 2b Rectangular convex portions at both ends of the hitch member 1 3a, 3b Brackets attached to the vehicle body 4a, 4b Rectangular concave frames formed on opposing surfaces of the brackets 5a, 5b of the brackets Rectangular recesses formed on opposing surfaces 6a, 6b, 6c, 6d Joint bolts 7a, 7b, 7c, 7d Joint nuts 8 Hitch ball mounting port 9 Hitch ball 101 Mounting bracket 102 Member portion 103 Hitch ball 110a, 110b Jimny vehicle body Bracket 111 to be attached Member parts 112a, 112b of the conventional hitch member Joint parts 113a, 113b, 113c, 113d between the ends 112a, 112b of the member part 111 of the conventional hitch member and the brackets 110a, 110b Joint bolts 114a, 114b, 114c, 114d same joint nut

Claims (3)

A hitch member for towing various trailers at the rear of a car body,
Two brackets that can be attached vertically to the rear of the vehicle,
a member portion of a hitch member joined between the two brackets;
A hitch member characterized in that both ends of the member portion have a rectangular plate formed in a rectangular shape, and a bracket surface facing the rectangular plate has a rectangular recess into which the rectangular plate is fitted. Instead of a rectangular plate at both ends of the member part and a rectangular recess into which the bracket surface facing the rectangular plate fits into which the rectangular plate is fitted, a rectangular recess on the surface of the rectangular plate and a rectangular plate with a rectangular convex shape on the bracket surface opposite thereto. The hitch member according to claim 1, characterized in that it has: A rectangular plate at both ends of the member part and a rectangular recess into which the bracket surface facing the rectangular plate fits the rectangular plate, or a rectangular recess on the surface of the rectangular plate and a rectangular convex square plate on the opposing bracket surface. 3. The hitch member according to claim 1 or 2, wherein the convex portion and the concave portion are respectively elliptical or angular in shape.

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