JP6343545B2 - Tow truck - Google Patents

Description

  The present invention relates to a tow truck that is towed by a tow truck.

  Conventionally, for example, a tow cart disclosed in Patent Document 1 includes a cart body having a rectangular shape extending in the towing direction in a plan view, and vertical shafts extending in the vertical direction at four corners of the bottom surface of the cart body. A rotation caster that is rotatable around the center is provided. A through hole having a rectangular shape in a plan view is formed in the substantially center of the bottom surface of the carriage body, and a rotating arm extending in the pulling direction is disposed in the through hole. The front end of the rotating arm in the pulling direction is pivotally supported by the carriage main body by a support shaft extending in the horizontal direction intersecting the pulling direction, while the lower surface of the rotating arm at the rear end side in the pulling direction is A fixed caster is fixed to roll in the pulling direction. Further, the other end side of the rotating arm is constantly biased downward by a biasing member. A rod-shaped operation lever extending in the towing direction is slidably mounted in the towing direction on the front side in the towing direction on the bottom surface of the cart body. When the operation lever is slid in the towing direction rearward, the operation lever rotates. By slidingly contacting the lower surface of the arm, the rotating arm is rotated upward against the urging force of the urging member to separate the fixed caster from the ground. By retracting from the lower side of the rotating arm, the rotating arm is rotated downward by the urging force of the urging member, and the fixed caster is brought into contact with the ground. In this way, by the sliding operation of the operation lever, the fixed caster is brought into contact with the ground, and the movement of the towing cart in the pulling direction is stabilized, and the fixed caster is separated from the ground and each rotating caster is brought into contact with the ground. It can be switched to a state in which the moving direction of the tow cart is not limited.

JP 2009-40146 A

  However, the tow cart of Patent Document 1 has a complicated structure for switching between a state in which the fixed caster is brought into contact with the ground and a state in which the fixed caster is separated from the ground, resulting in increased manufacturing costs.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a low-cost traction cart that can be switched between a state in which movement in the traction direction is stable and a state in which the movement direction is not limited. Is to provide.

  In order to achieve the above object, the present invention is characterized in that a steering caster that rotates around an inclined axis of inclination is provided.

  That is, in the first invention, the carriage main body on which the load is placed, and the front side of the carriage main body in the traction direction, and can be rotated around an inclination axis that is inclined upward or downward with respect to the traction direction. A steering caster in which an axle is not located on the inclined axis, a plurality of rotating casters provided in a midway portion in the pulling direction of the carriage main body and rotatable around a vertical axis extending in the vertical direction; A plurality of fixings that are fixed to roll in the traction direction at a predetermined interval in the horizontal direction intersecting the traction direction at the rear end side of the trolley body, and the lower end is positioned above the lower end of the rotating caster. The lower end of the steering caster is positioned above the lower end of the rotating caster in a state where the steering caster is rotated so that its axle is positioned above the inclined axis. When the steering caster is rotated so that its axle is positioned below the tilt axis, it protrudes downward from the lower end of the rotating caster and comes into contact with the ground, so that the cart body is moved in front of its pulling direction. It is set so that the fixed caster is brought into contact with the ground by tilting so that the side is positioned upward and the rotating caster is separated from the ground.

  According to a second aspect, in the first aspect, the steering caster, the rotating caster, and the fixed caster have the same structure.

  According to a third invention, in the first or the second invention, the cart body has a rectangular shape extending in the pulling direction in a plan view, and the rotating caster is centered on the central portion of the cart body in the pulling direction front side. Are provided at least in one place on the rear side in the traction direction and one place on the rear side in the traction direction, or at one place on the front side in the traction direction and two places on the rear side in the traction direction. It is located so that the center part of the said trolley | bogie main body may be included in the inner side of the triangle.

  According to a fourth invention, in any one of the first to third inventions, a support bracket for supporting the steering caster so as to be rotatable around the tilt axis is provided on the front end side in the pulling direction of the cart body. The support bracket has a restricting portion capable of restricting the rotation of the steering caster around the tilt axis, and the tilt axis of the steer caster is positioned so that the axle is positioned below the tilt axis. It is possible to rotate around the vertical axis extending in the vertical direction in a state in which the cart body is tilted by rotating around and the rotation of the steering caster around the inclined axis is regulated by the regulating part. It is characterized by being.

  In the first invention, the structure for switching between a state in which the movement in the towing direction in the towing cart is stable and a state in which the moving direction is not limited is not complicated as in Patent Document 1, and thus the manufacturing cost can be kept low.

  In the second invention, when one tow truck is manufactured, the number of casters is one, so that the manufacturing is simplified and the parts cost can be kept low.

  In the third invention, when the fixed caster and the steering caster are separated from the ground, the three rotating casters provided in a well-balanced position in the cart main body come into contact with the ground, so that the cart for operating the tow cart The posture of the main body can be stabilized and the operability of the towing cart can be improved.

  In the fourth invention, the towing direction of the towing cart is changed by the rotation of the steering caster around the vertical axis. Accordingly, the front side of the trolley body in the traction direction moves up and down when the traction direction is changed, as in the first aspect of the invention in which the steering caster rotates around the tilt axis to change the traction direction of the traction truck. The running of the tow truck can be stabilized.

It is the side view of the traction trolley which concerns on Embodiment 1 of this invention, and is the figure which switched the traction trolley to the state without a restriction | limiting in a moving direction. It is A arrow directional view of FIG. The state from which the rotation caster rotated and the direction of the wheel changed from the state of FIG. 1 is shown. It is the figure which switched to the state from which the movement to a traction direction was stabilized by rotating a steering caster from the state of FIG. FIG. 3 is a view corresponding to FIG. 1 according to Embodiment 2 of the present invention. FIG. 5 is a view corresponding to FIG. 4 according to Embodiment 2 of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.
Embodiment 1 of the Invention
1 and 2 show a tow truck 1 according to Embodiment 1 of the present invention. The traction cart 1 includes a trolley body 2 on which a load 10 is placed, and the trolley body 2 has a rectangular plate shape extending in the traction direction in plan view.

  A pair of rectangular plates 2a are attached to the lower surface of each side portion in the middle of the traction direction of the carriage body 2 with a predetermined interval in the traction direction, and these four rectangular plates 2a are arranged in a square shape in plan view. It is out.

  As shown in FIG. 3, a rotating caster 3 is rotatably attached to each rectangular plate 2a around a vertical axis X1 extending in the vertical direction. That is, the rotating caster 3 is provided at a total of four locations, two locations on the front side in the traction direction and two locations on the rear side in the traction direction, with the central portion being the center of gravity of the cart body 2 as the center. It is located so as to include the central portion of the cart body 2 inside the triangle formed by three of the dynamic casters 3.

  As a specific example, two rotating casters 3 are provided on the lower surface in front of the traction direction of the cart body 2 at a predetermined interval in the horizontal direction intersecting the traction direction. And the central part of the carriage main body 2 is included in the inside of a triangle formed by one of the two rotary casters 3 provided on the lower rear surface of the carriage main body 2 in the pulling direction. .

  The rotating caster 3 includes a rectangular fixed plate 4 fixed to the rectangular plate 2a, and a pair of support plates 5 projecting in parallel downward from the fixed plate 4.

  The support plate 5 has a right-angled isosceles triangle shape, and one of the two sides having the same length corresponds to the fixed plate 4.

  Between the projecting ends of the two support plates 5, a wheel 6 is rotatably attached by an axle 6a, and the axle 6a is not on the vertical axis X1.

  Fixed casters 7 are fixed to both corners on the rear end side in the pulling direction of the cart body 2 so as not to rotate around the vertical axis. That is, the two fixed casters 7 are fixed so as to roll in the pulling direction at a position spaced apart by a predetermined distance in the horizontal direction intersecting the pulling direction.

  The fixed caster 7 has the same structure as the rotating caster 3 except that the fixed caster 7 is non-rotatably attached to the cart body 2. Detailed description is omitted.

  Further, since the fixed caster 7 is directly fixed to the lower surface of the cart body 2, the lower end of the fixed caster 7 is positioned higher than the lower end of the rotating caster 3 by the thickness of the rectangular plate 2a. The four rotating casters 3 are separated from the ground F while being in contact with the ground F.

  One end of a connecting member 9 extending in the pulling direction is fixed to the center upper portion of the cart body 2 on the front end side in the pulling direction, and a hook of a towing vehicle (not shown) can be hooked on the other end of the connecting member 9. A through-hole 9a is formed through vertically.

  On the other hand, a block-shaped support bracket 2b having a substantially triangular shape in a side view protrudes from a central lower portion of the cart body 2 on the front end side in the pulling direction. A mounting surface 2c is formed so as to be gradually located on the rear side in the pulling direction as it goes. The mounting surface 2c is inclined at about 45 degrees with respect to the ground in a side view.

  A steering caster 8 is attached to the mounting surface 2c. The steering caster 8 is rotatable about an inclined axis Y1 that is inclined downward with respect to the pulling direction.

  The steering caster 8 has the same structure as the rotating caster 3 and the fixed caster 7 except that the steering caster 8 is rotatably mounted on the mounting surface 2c. The same reference numerals as those of the casters 7 are attached, and detailed description is omitted.

  The axle 6a of the steering caster 8 is not on the tilt axis Y1.

  As shown in FIG. 1, the lower end of the steering caster 8 is such that the steering caster 8 is rotated so that its axle 6a is positioned above the tilt axis Y1. It is set above the lower end so as not to contact the ground F.

  On the other hand, when the steering caster 8 is rotated so that the axle 6a is positioned below the tilt axis Y1, the lower end of the steering caster 8 is lower than the lower end of the rotating caster 3 as shown in FIG. By popping out downward and coming into contact with the ground F, the cart body 2 is tilted so that the front side in the pulling direction is positioned upward so that the fixed caster 7 is brought into contact with the ground F and the rotating caster 3 is separated from the ground F. It is set to let you.

  Next, an operation of towing one of the tow trucks 1 arranged in a row in the factory on the wall with a towing car (not shown) will be described.

  First, as shown in FIG. 1, the operator confirms that the axle 6a of the steering caster 8 of the towing cart 1 to be towed is positioned above the tilt axis Y1.

  Next, the operator pulls the traction cart 1 in a horizontal direction intersecting the traction direction (so as to be separated from the wall in the factory). Then, since both the fixed casters 7 and the steering casters 8 are not in contact with the ground F, as shown in FIG. 3, the respective rotating casters 3 are rotated around the vertical axis X1, and the wheels 6 of the respective rotating casters 3 are moved. Roll in a horizontal direction that intersects the towing direction. Therefore, the operator can easily move one of the plurality of traction carts 1 in the column state in the factory.

  Next, the steering caster 8 of the moved traction cart 1 is rotated so that the axle 6a is positioned below the tilt axis Y1. Then, when the lower end of the steering caster 8 protrudes downward from the lower end of the rotating caster 3 and comes into contact with the ground F, the front side in the pulling direction of the cart body 2 is lifted. Then, as shown in FIG. 4, the cart body 2 is tilted so that the two fixed casters 7 are in contact with the ground F, and the four rotating casters 3 are separated from the ground F.

  Thereafter, a hook of a tow truck (not shown) is hooked on the through hole 9a of the connecting member 9, and the tow truck 1 is pulled by the towing truck. Then, since both the fixed casters 7 are fixed to the cart body 2 so as to roll in the pulling direction, the movement in the pulling direction is stabilized.

  After the towing cart 1 is pulled, when the towing cart 1 is accommodated in a narrow space, the steering caster 8 of the towing cart 1 is rotated so that the axle 6a is positioned above the tilt axis Y1. Then, the steering caster 8 is separated from the ground F, and the carriage main body 2 extends in the horizontal direction. As shown in FIG. 1, the four rotating casters 3 come into contact with the ground F and the fixed casters 7 are grounded. Separate from F. Then, there is no restriction on the moving direction of the tow truck 1, and the tow truck 1 can be easily accommodated in a narrow space.

  As described above, according to the first embodiment of the present invention, the structure for switching between the state in which the movement in the towing direction in the towing cart 1 is stable and the state in which the movement direction is not limited is not complicated as in Patent Document 1, so that the manufacturing cost is reduced. Can be kept low.

  Moreover, since the structure of the rotation caster 3, the fixed caster 7, and the steering caster 8 is the same, when manufacturing one tow cart 1, there is only one type of caster, the manufacture is simplified and the parts cost is reduced. Can be suppressed.

Further, when the fixed caster 7 and the steering caster 8 are separated from the ground F, the three rotating casters 3 provided in a well-balanced position in the cart body 2 come into contact with the ground. The attitude of the main body 2 of the truck can be stabilized and the operability of the tow truck 1 can be improved.
<< Embodiment 2 of the Invention >>
5 and 6 show a tow truck 1 according to Embodiment 2 of the present invention. In this Embodiment 2, since the structure which attaches the steering caster 8 with respect to the trolley | bogie main body 2 only differs from Embodiment 1, others are the same as Embodiment 1, Therefore Hereinafter, only a different part from Embodiment 1 is shown. This will be described in detail.

  As shown in FIG. 5, a flat block-shaped fixing bracket 11 is attached to the lower surface of the center of the cart body 2 in the front side in the pulling direction, and the lower part of the fixing bracket 11 goes to the front side in the pulling direction. Accordingly, a mounting surface 11a that is gently inclined so as to be positioned downward is formed.

  A block-shaped support bracket 12 having a substantially triangular shape in a side view is attached to the attachment surface 11a so as to be rotatable around the axis Z1, and the axis Z1 gradually becomes rearward in the pulling direction as it goes downward. It is inclined with respect to the cart body 2 so as to be positioned.

  A mounting surface 12a is formed on the rear portion of the support bracket 12 in the pulling direction so as to be gradually inclined toward the front in the pulling direction as going downward. The mounting surface 12a is inclined at about 45 degrees with respect to the ground in a side view.

  The steering caster 8 is attached to the attachment surface 12a so as to be rotatable around an inclination axis Y2 inclined upward with respect to the pulling direction. That is, the support bracket 12 supports the steering caster 8 so as to be rotatable around the tilt axis Y2.

  Further, the axle 6a of the steering caster 8 is not on the tilt axis Y2.

  Further, the support bracket 12 is provided with a lock mechanism 12b (regulator) that can regulate the rotation of the steering caster 8 around the tilt axis Y2.

  The lower end of the steering caster 8 is positioned above the lower end of the rotating caster 3 in a state where the steering caster 8 is rotated so that the axle 6a is positioned above the inclined axis Y2. It is set not to touch the ground F.

  On the other hand, when the steering caster 8 is rotated so that the axle 6a is positioned below the tilt axis Y2, the lower end of the steering caster 8 is lower than the lower end of the rotating caster 3 as shown in FIG. By popping out downward and coming into contact with the ground F, the cart body 2 is tilted so that the front side in the pulling direction is positioned upward so that the fixed caster 7 is brought into contact with the ground F and the rotating caster 3 is separated from the ground F. It is set to let you.

  Further, when the cart body 2 is tilted by rotating the steering caster 8 about the tilt axis Y2 so that the axle 6a is positioned below the tilt axis Y2, the axis Z1 extends in the vertical direction. Thus, the support bracket 12 is rotatable about the axis Z1 relative to the cart body 2 in a state where the rotation of the steering caster 8 about the tilt axis Y2 is restricted by the lock mechanism 12b. It has become. Accordingly, the steering caster 8 rotates around the axis Z1 during towing and changes the towing direction of the towing cart 1.

  Note that the towing operation of the tow truck 1 according to the second embodiment is the same as that of the first embodiment except that the steering caster 8 rotates about the axis Z1 during towing, and thus detailed description thereof is omitted.

  As described above, according to the second embodiment of the present invention, the pulling direction of the pulling cart 1 is changed by the rotation of the steering caster 8 around the axis Z1 extending in the vertical direction. Therefore, the front side of the trolley body 2 in the traction direction moves up and down when the traction direction is changed, as in the first embodiment in which the traction direction of the traction trolley 1 is changed by rotating the steering caster 8 around the tilt axis Y1. The traveling of the tow cart 1 can be stabilized.

  In Embodiments 1 and 2 of the present invention, four rotating casters 3 are attached to the cart body 2, but the present invention is not limited to this, and at least three may be attached.

  In the first and second embodiments of the present invention, the carriage main body 2 has a plate shape, but may have other shapes, for example, an L-shaped frame assembled in a frame shape.

  Furthermore, in Embodiments 1 and 2 of the present invention, two fixed casters 7 are attached to the cart body 2, but the present invention is not limited to this, and a plurality of casters 7 may be attached.

  In addition, in Embodiments 1 and 2 of the present invention, the rotating caster 3, the fixed caster 7, and the steering caster 8 have the same structure, but the present invention is not limited to this, and the casters have different structures. Also good.

  The present invention is suitable for a towing cart towed by a towing vehicle.

DESCRIPTION OF SYMBOLS 1 Towing cart 2 Bogie body 3 Rotating caster 6a Axle 7 Fixed caster 8 Steering caster 10 Luggage 12 Support bracket 12a Lock mechanism (regulator)
F Ground X1 Vertical axis Y1, Y2 Tilt axis Z1 axis

Claims (4)

A cart body for placing luggage;
A steering caster that is provided on the front end side in the traction direction of the carriage main body and is rotatable about an inclination axis that is inclined upward or downward with respect to the traction direction, and the axle is not positioned on the inclination axis;
A plurality of rotating casters that are provided in the middle of the pulling direction of the cart body and are rotatable about a vertical axis extending in the vertical direction;
A plurality of lower ends positioned above the lower end of the rotating caster, fixed at the rear end side of the cart body in the pulling direction and at a predetermined interval in the horizontal direction intersecting the pulling direction with a predetermined interval. With fixed casters,
The lower end of the steering caster is positioned above the lower end of the rotating caster in a state where the steering caster is rotated so that its axle is positioned above the tilt axis, while the steering caster is positioned on the axle. In a state in which it is rotated below the tilt axis, and protrudes downward from the lower end of the rotating caster so as to come into contact with the ground so that the front side in the pulling direction of the cart body is positioned upward. A towing cart configured to tilt and bring the fixed caster into contact with the ground and to separate the rotating caster from the ground. In the tow cart according to claim 1,
The steering caster, the rotating caster, and the fixed caster have the same structure. In the tow cart according to claim 1 or 2,
The cart body has a rectangular shape extending in the pulling direction in plan view,
The rotating caster has a total of three locations, ie, two locations on the front side in the towing direction and one location on the rear side in the towing direction, or one on the front side in the towing direction and the rear side in the towing direction. A towing cart provided at least in two locations and positioned so as to include a central portion of the cart body inside a triangle formed by these three rotating casters. In the tow cart as described in any one of Claim 1 to 3,
On the front end side in the pulling direction of the bogie body, a support bracket that supports the steering caster so as to be rotatable around the tilt axis is provided.
The support bracket has a restricting portion capable of restricting the rotation of the steering caster around the tilt axis, and the steering caster is arranged around the tilt axis so that the axle is positioned below the tilt axis. The cart body is tilted so that it can be rotated about a vertical axis extending in the vertical direction in a state where the rotation of the steering caster around the tilt axis is regulated by the regulating portion. A towing cart characterized by

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