JPH0629175Y2 - Tractor trailer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a two-wheel trailer used in connection with a riding tractor.

(Prior Art) A conventional towed two-wheeled trailer is a type in which the wheels attached to the vehicle body have an axle similar to that of a general vehicle horizontally fixed in the width direction of the vehicle body.

The trailer connects the hitch at the tip of the tow rod to the tractor with a tow rod on the side of the tractor by a pin, and the tow rod and the tow rod are bendably connected in the horizontal and vertical directions.

(Problems to be solved by the invention) Since it has the above-mentioned structure, when it is towed by being connected to the tractor, there is no problem in forward traveling, but when reversing, the vehicle bends at the connecting portion between the tow rod and the tow rod, and Since the wheels are fixed so that their orientation does not change with respect to the vehicle body, the trailer will face in a different direction when the tractor retracts, and it is very difficult to retract it in the desired direction. It causes trouble.

In addition, it is possible to use the wheel structure of the trailer as casters to facilitate the backward movement, but in that case the problem about the backward movement can be solved, but when moving forward the caster swings left and right and the trailer also Shaken to the left and right,
It is not possible to drive forward stably and there is a problem in safety.

In view of the conventional circumstances as described above, the present invention aims at preventing the lateral runout during forward traveling and safely traveling, and when retracting, the tractor and the trailer are integrated in a straight line. An object of the present invention is to provide a tractor trailer that can be easily retracted in a desired direction.

(Means for Solving the Problems) In order to achieve the above object, a tractor towing trailer according to the present invention has large casters attached to both sides of a rear lower surface of a vehicle body so that it can pivot and swing. A guide outer pipe is fixed to the central portion in the front-rear direction, and a hitch that connects to the tow rod of the tractor is provided at the tip of the guide outer pipe.
Further, a tow rod having a connecting portion for allowing horizontal bending is inserted behind the hitch so as to be slidable forward and backward, and the tow rod is biased by a spring so as to be drawn into the outer guide tube, and further, The tow rod can be hooked to the outer guide tube at the front and rear portions of the connecting portion, respectively, and is linked to the front and rear slides of the tow rod to lock or release the swinging motion of the large caster. It is characterized in that the free state of the large caster is locked so that the wheels are parallel to the direction of the vehicle body, and the large caster is in the free state when the tow rod is pulled into the guide outer tube.

The means for linking and switching the large caster between the fixed state and the free state by sliding the tow rod forward and backward is means for engaging and disengaging the lock pin with respect to the large caster using a lever, or locking in synchronization with the forward and backward movement of the tow rod. Any means such as sliding the pin to engage and disengage from the large caster can be used.The point is that the large caster is fixed and the tow rod is drawn into the outer guide tube when the tow rod projects forward from the outer guide tube. In the state, any type can be used as long as the large casters are switched so as to be in a free state.

(Operation) According to the above means, the tow rod is provided with the connecting portion that allows the bending in the horizontal direction, and when the connecting portion is located outside the outer guide tube, the connecting rod is horizontal to the tow rod of the tractor. In this state, the large caster is prevented from swinging and turning, and the wheels are held parallel to the direction of the vehicle body. Therefore, forward traveling is performed stably and safely. Further, when the tow rod is pulled into the guide outer pipe and the movement (refraction) of the connecting portion is restricted by the guide outer pipe, the tractor and the trailer form a straight line between the non-bendable tow rod and the tow rod. The body of the tractor and the trailer are integrated,
In addition, the large casters can be switched to the free state (the state in which the swing can be performed), and the backward movement can be performed as desired.

(Advantages of the Invention) Since the tractor trailer for tractor of the present invention is configured as described above in detail, it is inserted into the outer guide tube and the traction rod is projected forward so that the traction rod can be bent horizontally. At this time, the large caster is prevented from swinging and turning, and the wheels are parallel to the direction of the vehicle body, so that forward traveling can be performed stably and safely.

Also, when the tow rod is stored inside the outer guide tube and refraction of the tow rod is not possible, the large casters are released from the swinging rotation prevention state, and the tractor and trailer are aligned. Since the large casters can swing freely, the trailer can be retracted as desired. Therefore, by riding the tractor and switching between the forward and backward slides of the tow rod when moving forward and backward, stable running is possible and a very convenient trailer can be provided.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawing, A is a tractor, B is a tow trailer, and the trailer B has large casters 2 on both sides of a rear lower surface of a vehicle body 1. Along with mounting, a traction means is provided in the center of the lower surface of the front part, and the traction means can be connected to the traction rod of the tractor A.

The large casters 2 attached to the lower surface of the vehicle body 1 have a structure capable of sufficiently withstanding a large weight.
A wheel mounting arm 2b that rotatably holds is pivotally supported so that it can swing and swing, and an engaging recess 20 into which a lock pin 16 described later is fitted and disengaged is provided around the upper portion of the wheel mounting arm 2b.

Further, the traction means attached to the vehicle body 1 comprises a guide outer tube 4 fixed to the lower surface of the vehicle body 1 by a V-shaped bolt 3 and a tow rod 5 inserted in the guide outer tube 4 so as to be slidable back and forth. , The tow rod 5 has a hitch 7 which is connected to the tow rod 6 at the tip thereof.
And a connecting portion 8 for allowing horizontal bending is formed behind the hitch 7, and hook holes 9 and 9'for hooking the outer guide tube 4 to the front and rear portions of the connecting portion 8. Has been drilled.

The latching pin 10 fitted into the latching holes 9 and 9'is inserted into the through hole 11 formed in the outer guide tube 4, and at the same time, the spring is formed.
It is urged in the direction to engage with the retaining holes 9 and 9'at 12,
Also, the latch pin 10 is springed on the outer side of the outer guide tube 4.
An operation lever 13 for pulling out from the hooking hole 9 or 9'against the pulling force of 12 is provided, and the hooking pin 10 can be pulled out from the hooking hole 9 or 9'by rotating the operation lever 13. Is done.

Further, the rear end of the towing rod 5 inserted into the outer guide tube 4 is made to project from the rear end of the outer guide tube 4, and an operating plate 14 protruding in the left-right direction is fixed to the protruding end, and the operating plate A spring 15 is stretched over 14 and the frame of the vehicle body 1,
The tow rod 5 is always pulled rearward.

Further, at the front positions of the large casters 2 on the lower surface of the vehicle body 1, a support cylinder 17 having a lock pin 16 fixed to the vehicle body 1 side is provided.
The lock pin 16 is slidably inserted in the inside thereof, and the receiving end 19 of the lever bar 18 against which the action point 18b of the lever pin 18 abuts is fixed to the front end of the lock pin 16. The rear end of the lock pin 16 is attached to the wheel mounting arm 2b of the large caster 2. The lock pin 16 is adapted to be able to be fitted into and disengaged from the provided engagement recess 20, and the lock pin 16 is urged by a spring 21 so as to be pulled toward the large caster 2.

Lever rod 18 that slides the lock pin 16 in the front-back direction
Is rotatably pivotally attached to the vehicle body 1 through a mounting member, and the force point 18a at one end is the working plate 1 at the rear end of the towing rod 5 described above.
4, the contact point 18b at the other end of the contact plate 19 as described above.
Is abutted against.

With the above structure, the large caster 2 is projected forward of the lock pin 16 by the action of the lever rod 13 by accommodating the connecting portion 8 of the tow rod 5 in the outer guide tube 4 and making the tow rod 5 linear. Free state, tractor A and trailer B
Since they are integrated, the trailer B can be easily retracted in the same manner as a general vehicle.

Next, when the operation lever 13 is rotated to pull out the latch pin 10 from the latch hole 9 and the tractor A is advanced in this state, the outer guide tube 4 and the tow rod 5 are separated from each other, and The hooking pin 10 of the pipe 4 is fitted and hooked into a hooking hole 9'rear from the connecting portion 8 so that the tow rod 5 can be bent, and the tractor A and the trailer B can be bent.
Are refractably connected. When the tow rod 5 projects forward with respect to the outer guide tube 4, the lock pin 16 is fitted into the engaging recess 20 of the large caster 2 by the action of the lever rod 18.
The large caster 2 is prevented from swinging, and the wheels 2a are fixed in the same direction as the vehicle body 1. Thereby, trailer B
Since the large casters 2 are fixed even when the vehicle is moved forward, there is no shake in the left and right directions, and safe traveling is possible.

In the figure, reference numeral 22 denotes a lift link provided on the tractor A side, and its rear end can be brought into and out of contact with an abutment plate 23 provided on the front surface of the vehicle body 1 of the trailer B, and the tow rod 5 is placed inside the outer guide tube 4. When the tractor A and the trailer B are united by being pulled in, the rear end of the lift link 22 comes into contact with the abutment plate 23 to prevent the trailer B from swinging in the left-right direction, and at the same time, the vehicle body 1 using only the tow rod 5 is provided.
It is possible to reduce the burden of pushing backwards.

[Brief description of drawings]

The drawing shows an embodiment of the present invention. Fig. 1 is a partially cutaway view, Fig. 2 is a bottom view of the same, Fig. 3 is an enlarged view of the main parts in Fig. 1, and Fig. 4 shows a tow rod. It is the same enlarged view which switched to the refraction possible state. In the figure, A: tractor, B: trailer, 1: vehicle body, 2: large caster, 4: outer guide tube, 5: traction rod, 6: traction rod, 7: hitch, 8: connecting part, 9, 9 ': hook hole 10 : Hooking pin

Claims (1)

[Scope of utility model registration request] Claims: 1. Large casters are attached to both sides of a rear lower surface of a vehicle body so as to be swingable and swingable, and a guide outer tube is fixed to a central portion of a front lower surface of the vehicle body in the front-rear direction. ,
A tow rod having a hitch for connecting with a tow rod of the tractor at its tip and having a connecting portion for allowing horizontal bending at the rear of the hitch is slidably inserted back and forth, and the tow rod is guided by a spring. The pulling rod is urged to be drawn into the outer pipe, and the towing rod can be freely hooked at the front and rear portions of the connecting portion with respect to the guiding outer pipe. When the tow rod protrudes forward, the free state of the large caster is locked and the wheels are parallel to the direction of the vehicle body, and when the tow rod is pulled into the outer guide tube, the large caster is in the free state. Tractor trailer for tractors.