JP2004217130A - Hook for towing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hook for towing that can absorb energy at a collision and is easily designed and manufactured by an extremely clear structure. <P>SOLUTION: The hook for towing comprises an outer cylinder for fixing the hook to a towed object, and a cylinder body stored in the outer cylinder in a state that movement in the towing direction and movement in the inverse towing direction are constrained. A locking section for towing is formed at the exposed end of the cylinder body in the towing direction. The cylinder body is the hook for towing constituted so as to constrain the movement in the inverse towing direction in an state easier than the movement in the towing direction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tow hook.
[0002]
[Prior art]
Hooks for towing the vehicle when it becomes impossible to move are fixed to a foundation structure such as a frame pipe.
It is conceivable that this hook comes into contact with another automobile or structure.
Then, an axial impact force acts on the hook bolt, and the external force is transmitted to the frame pipe, and an important structure may be deformed.
In order to absorb the impact in such a case, for example, a towing hook having a structure in which a part of the hook is formed in a wave shape and configured as an energy absorbing portion and the portion is deformed to absorb the energy of the collision is used. Is being developed. (For example, refer to Patent Document 1.)
Alternatively, a towing hook having a structure in which a hollow container-shaped closed cross section is provided at the base end on the hook attachment side and the hollow container-shaped closed cross section is deformed in the event of a collision to absorb the energy of the collision has been developed. ing. (For example, see Patent Document 2.)
[0003]
[Patent Document 1]
JP 2000-168325 A [Patent Document 2]
JP 2000-177345 A
[Problems to be solved by the invention]
As described above, the conventional energy-absorbing towing hook has a structure in which a steel plate is formed into a corrugated shape or a hollow container shape, and the energy of the collision applied to the hook due to its deformation is absorbed.
Therefore, complicated factors are involved in determining the absorption capacity, such as the thickness of the steel sheet, the shape of the wave, the dimensions of the container, and the mounting position, and the design and production were not easy.
Furthermore, the collision situation is extremely complex, which adds to the uncertainties and makes the design difficult.
The above problems are not limited to automobiles, but are common to all towed objects that need to be towed, such as large devices that are scheduled to move.
[0005]
[Object of the present invention]
The present invention has been made to solve the above problems, and provides a towing hook that can absorb energy at the time of a collision and has a simple design and manufacture by a very clear structure. With the goal.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a towing hook according to the present invention includes an outer cylinder for fixing to a towed object, and a movement in the towing direction and a movement in an anti-towing direction, which are restricted in the outer cylinder. The tubular body is housed in a retracted state, and a locking portion for towing is formed at the exposed end on the towing direction side of the tubular body, and the movement of the tubular body in the anti-traction direction is the movement in the towing direction. It is a tow hook configured to be restrained in an easier state.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
[0008]
<A> Outer cylinder 1.
The outer cylinder 1 is a steel cylinder having at least a traction side opened.
The outer cylinder 1 is firmly fixed to a car or other towed object in the towing direction.
An engagement protrusion 11 is provided on the inner surface of the outer cylinder 1 in the direction of pulling the inner surface. The engagement protrusion 11 restricts movement of the nut tube 2 described later in the pulling direction.
[0009]
<B> Nut cylinder 2.
The cylindrical body is housed in the outer cylinder 1. In the example of the figure, the nut cylinder 2 is housed.
The outer diameter of the nut cylinder 2 is substantially equal to the inner diameter of the outer cylinder 1 and is a cylindrical body having a threaded portion formed on the inner surface thereof.
The end of the nut cylinder 2 on the pulling side comes into contact with the engagement projection 11 protruding from the inner surface of the outer cylinder 1.
As a result, the movement of the nut cylinder 2 in the pulling direction is restricted.
[0010]
<C> Bolt shaft 4.
A bolt shaft 4 is detachably attached to the inside of the nut tube 2 via a screw portion.
That is, the threaded portion of the inner surface of the nut cylinder 2 and the threaded portion of the bolt shaft 4 can be engaged.
The bolt shaft 4 forms a towed locking member 41 such as a hook-like or annular shape at an end exposed from the nut tube 2 toward the towing side.
[0011]
<D> Restriction of movement of nut cylinder 2.
The end on the traction side of the nut tube 2 housed in the outer tube 1 is housed in a state of contacting the engagement protrusion 11 on the inner surface of the outer tube 1.
As a result, the movement of the nut cylinder 2 in the pulling direction is restricted.
Further, the movement of the nut cylinder 2 in the anti-traction direction is restricted. For this purpose, for example, the pin 3 is made to penetrate the outer cylinder 1 and the nut cylinder 2.
Then, the nut cylinder 2 cannot move in the axial direction inside the outer cylinder 1 due to the pins 3.
The pin 3 may not penetrate both, but may penetrate the outer cylinder 1 so as to be positioned at the end of the nut cylinder 2 on the anti-traction side.
Then, since the end of the nut cylinder 2 on the anti-traction side comes into contact with the pin 3, the movement of the nut cylinder 2 in the anti-traction direction is restricted.
In this way, the nut cylinder 2 accommodated in the outer cylinder 1 is accommodated in a state where the movement in the traction direction and the movement in the anti-traction direction are restricted.
[0012]
<E> Difference in binding force.
As described above, the movement of the nut cylinder 2 is restricted inside the outer cylinder 1 in both the traction direction and the anti-traction direction.
However, there is a difference in the binding force.
That is, the outer cylinder 1 and the nut cylinder 2 restrain the movement in the anti-traction direction in a state easier than the movement in the pulling direction.
Therefore, for example, the breaking strength of the pin 3 for restraining the movement of the nut cylinder 2 in the anti-pulling direction is selected and set to a value smaller than the breaking strength of the engaging projection 11 for restraining the movement of the nut cylinder 2 in the towing direction. .
[0013]
<F> Operation during towing.
When the towed object is towed, the bolt shaft 4 is screwed into the threaded portion of the nut tube 2 to fasten the two.
Then, a rope or the like is attached to the hook-shaped locking body 41 formed at the exposed end of the bolt shaft 4 and is pulled.
The external force applied to the bolt shaft 4 is transmitted to the foundation structure of the towed object via the engagement protrusion 11 of the outer cylinder 1 and the towed object is moved.
[0014]
<G> At the time of collision.
If there is an accident such as the tip of the bolt shaft 4 colliding with another object, a force in the anti-traction direction acts on the bolt shaft 4.
The movement of the bolt shaft 4 in the anti-traction direction is restricted by the pin 3 or the like.
However, the restraining force in the anti-traction direction is configured to be smaller than the restraining force in the pulling direction.
Therefore, the restraint of the nut cylinder 2 by the outer cylinder 1 is released by the force in the anti-traction direction, and the nut cylinder 2 freely slides in the anti-traction direction inside the outer cylinder 1. As a result, no external force acts on the outer cylinder 1 and the external force does not affect the towed object to which the outer cylinder 1 is attached.
[0015]
<H> Another embodiment.
The above is the structure in which the nut cylinder 2 is housed inside the outer cylinder 1.
However, if the nut cylinder 2 and the bolt shaft 4 are formed integrally, a cylinder without a nut can be adopted.
That is, as shown in FIG. 4, an outer cylinder 1 fixed to a towed object and a pressure receiving body 5 housed in the outer cylinder 1 in a state where movement in the towing direction and movement in the anti-towing direction are restricted. I do.
For this purpose, an engagement projection 11 is provided on the inner surface of the outer cylinder 1 and the end of the pressure receiving body 5 in the traction direction is brought into contact with the engagement projection 11 to restrict the movement in the traction direction.
Further, the outer cylinder 1 and the pressure receiving body 5 are restrained by the pins 3 to restrain the movement in the anti-traction direction.
At the exposed end of the pressure receiving body 5, a locking body 41 for towing is formed.
Then, similarly to the above-described embodiment, the outer cylinder 1 and the pressure receiving body 5 are configured to restrain the movement in the anti-traction direction in a state easier than the movement in the traction direction.
In the case of this embodiment, the hook-shaped or annular locking body 41 is exposed from the end of the towed object, but is employed in a work vehicle or other towed objects that do not require special design considerations. can do.
[0016]
【The invention's effect】
Since the present invention is as described above, the following effects can be achieved.
<B> When an external force is applied in the direction opposite to the direction of pulling, the pin is severely cut, so it does not involve complicated elements. As a result, it is designed with high reliability. And can be manufactured.
<B> In the event of a collision, the locking of the hook is released and the locking body 41 slides easily in the anti-traction direction, so that the external force is not transmitted to the towed object and a part of the towed object is deformed. Such an accident does not occur.
<C> When the towed object is an automobile, the occurrence of a secondary accident such as opening of the airbag can be prevented.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an arrangement of an outer cylinder and a nut cylinder of a towing hook of the present invention.
FIG. 2 is an explanatory diagram of the overall configuration.
FIG. 3 is an explanatory view of a state in which a force in the anti-traction direction acts on the towing hook.
FIG. 4 is an explanatory diagram of another embodiment.
FIG. 5 is an explanatory view of an attached state of the towing hook of the present invention.

Claims (4)

An outer cylinder for fixing to the towed object,
In this outer cylinder, it consists of a cylinder housed in a state where movement in the towing direction and movement in the anti-traction direction are restrained,
At the exposed end on the towing direction side of this cylindrical body, a locking portion for towing is formed,
The cylindrical body is configured to be restrained in a state where movement in the anti-traction direction is easier than movement in the traction direction,
Tow hook. An outer cylinder for fixing to the towed object,
A nut cylinder housed in this outer cylinder with the movement in the towing direction and the movement in the anti-traction direction restrained,
It consists of a bolt shaft that can be removed and attached to the nut cylinder from the pulling direction,
At the exposed end of the bolt shaft in the pulling direction, a locking portion for towing is formed,
The outer cylinder and the nut cylinder are configured such that the movement in the anti-traction direction is restrained in an easier state than the movement in the traction direction,
Tow hook. The end of the nut cylinder on the towing side abuts on an engaging projection protruding from the inner surface of the outer cylinder to restrict movement in the towing direction,
The end on the anti-traction side of the nut cylinder abuts on a pin penetrating the outer cylinder to restrict movement in the anti-traction direction,
The towing hook according to claim 1. An outer cylinder for fixing to the towed object,
In this outer cylinder, it is composed of a pressure receiving body stored in a state where movement in the traction direction and movement in the anti-traction direction are restrained,
At the exposed end of the pressure receiving body in the towing direction, a locking portion for towing is formed,
The outer cylinder and the pressure receiving member are configured to restrain the movement in the anti-traction direction in a state easier than the movement in the traction direction,
Tow hook.

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