JP2020116984A - Trolley - Google Patents

Abstract

To provide a trolley capable of stably towing a trolley with a heavy load placed on its platform by suppressing slippage of the wheels of the tractor even if the tractor is relatively lightweight. A truck (10) has a loading platform (12) on which loads (40A to 40D) are placed, running wheels (14) attached to the loading platform (12), and is fixed to the loading platform (12) by adjusting the height thereof, and is connected to a towing vehicle. a traction section 20 to which a connected connecting member 26 is connected. [Selection drawing] Fig. 4

Description

The present invention relates to a trolley on which a heavy load is mounted.

Conventionally, in the field of physical distribution, at a storage location of luggage such as a warehouse, a trolley carrying a luggage is connected to a towing vehicle, and the towing vehicle is towed to a predetermined location by using the connected towing vehicle to move the luggage. Work is being done. As such a bogie, Patent Documents 1 and 2 disclose a configuration in which one end of an arm as a connecting member is attached to a side frame (base frame) of the bogie and the other end is connected to a towing vehicle. It should be noted that luggage is placed on the side frame, but in addition to such a frame-shaped member, there is also a dolly that places the luggage on a plate-shaped member. In the present specification, a member of a trolley on which a luggage is placed is collectively referred to as a "packing carrier", in which a frame-shaped member and a plate-shaped member are collectively referred to.

Japanese Patent No. 4464555 Japanese Patent No. 3044616

Here, the heavier the load to be loaded on the loading platform, the greater the rotational torque for rotating the wheel against the rotational frictional force generated at the ground contact point of the traveling wheel of the truck due to the load of the load. Therefore, when there is a constraint on the traction force such as when the power of the traction vehicle is small or when the traction vehicle is moved manually, it is more advantageous to increase the diameter of the traveling wheels of the trolley so that a large rotational torque can be obtained with the traction force as small as possible.

However, if it is attempted to expand the loading platform above the wheels in order to increase the loading capacity or to improve the loading convenience, the traveling wheels have a large diameter, so that the loading platform located on the wheels is inevitably located. The height from the ground is also high. On the other hand, when the towing vehicle is relatively small and is relatively lightweight, for example, less than 1 ton, the position where the external force acting as the reaction force generated for towing the bogie works is lowered to ensure stability. Is important. From this point of view, the connecting portion on the towing vehicle side, to which the connecting member for connecting the towing vehicle and the bogie is connected, is often provided at a low position near the ground.

For this reason, as in Patent Documents 1 and 2, when the connecting position of the connecting member on the carriage side is the loading platform and the traveling wheels of the truck are large in diameter, the towing vehicle for the connecting member is large. The side end may be lower than the trolley-side end. That is, the end of the connecting member on the tow vehicle side is lower than that of the connecting portion attached to the carrier of the truck, and the heights of both ends of the connecting member do not become level (horizontal) between the tow vehicle and the truck.

For this reason, when the drive wheels of the tow vehicle are placed closer to the bogie and the connection between the tow vehicle and the bogie is a flexible connection in which the relative positions of both can be changed, the tow vehicle is connected through the connecting member. A force that lifts the drive wheel of the car is generated during towing. Therefore, there is a problem that the drive wheels slip and it is difficult to stably pull the wheels.

In this respect, in the case of the bogie of Patent Document 1, the towed vehicle side end of the arm, which is the connecting member, can rotate in the vertical direction about the bogie side end. However, since the end of the arm on the bogie side is fixed to the side frame of the bogie of the bogie, the mounting height on the bogie cannot be changed, and there is a difference in height between the arm connecting part on the tow vehicle side and the arm connecting part on the bogie side. If not, the arm is not horizontal.

Further, in the trolley of Patent Document 2, one end of the arm, which is a connecting member, is attached to a fulcrum pin inserted into a pair of elongated holes extending in the vertical direction. It can vary in the inner range. However, since this elongated hole is formed in the base frame as a loading platform, the height of the lower surface of the base frame becomes the lower limit no matter how the height of the mounting position at one end of the arm is changed. Therefore, as described above, when the connecting portion of the towing vehicle is lower than the loading platform of the truck, the height adjustment function of the elongated hole cannot handle it, and a height difference occurs between the connecting portion of the truck and the towing vehicle. Cannot be avoided. In addition, since Patent Document 2 does not disclose a structure for fixing the changed height of the mounting position, it is difficult for the connecting member to keep the level state.

In consideration of the above facts, the present invention provides a trolley capable of stably towing a trolley in which a heavy object is placed on a cargo bed, by suppressing slippage of wheels of the tractor even in a relatively lightweight tractor. The purpose is to

The carriage according to claim 1, wherein a luggage carrier on which luggage is loaded, traveling wheels attached to the luggage carrier, a height of which is fixed and fixed with respect to the luggage carrier, and a coupling which is coupled to a coupling portion of a towing vehicle. And a tow portion to which the member is connected.

According to the above configuration, it is possible to adjust and fix the mounting height of the tow portion with respect to the luggage carrier. Therefore, when the height of the connecting portion of the towing vehicle is low, the height of the towing portion is lowered so that the heights of the connecting portion and the towing portion become the same level. By adjusting the height of the towing portion in this manner, it is possible to prevent a force that lifts the wheels of the towing vehicle from being generated via the connecting member when the height of the towing portion is higher than that of the connecting portion. Further, since the tow portion is adjusted in height and fixed to the luggage carrier, the height does not change during towing.

The trolley|bogie of Claim 2 is a trolley|bogie of Claim 1, Comprising: The said tow part is a channel member fixed to the side surface of the said luggage carrier, and the long hole formed in the height direction to the said channel member. And the head is located inside the channel member, and the connecting member is connected to the tip of the threaded portion, and the channel is inserted from the outside of the channel member with a nut. And an adjusting bolt fixed to the member.

According to the above configuration, the adjusting bolt can be inserted into the elongated hole formed in the channel member fixed to the side surface of the bed, and the adjusting bolt can be moved up and down in the elongated hole to change the mounting height of the adjusting bolt. it can. A connecting member is connected to the tip of the threaded portion of the adjusting bolt, and the height of the adjusting bolt can be adjusted according to the height of the connecting portion of the towing vehicle to which the connecting member is connected. Moreover, the mounting height of the adjusted adjusting bolt can be fixed by sandwiching the region of the channel member around the elongated hole with the head of the adjusting bolt and the nut.

ADVANTAGE OF THE INVENTION According to this invention, even if it is a comparatively lightweight towing vehicle, the slippage of the wheel of a towing vehicle can be suppressed and the truck with the heavy load on the loading platform can be towed stably.

It is a side view which shows the trolley|bogie which concerns on 1st Embodiment. It is a top view which shows the trolley|bogie which concerns on 1st Embodiment. It is a perspective view which shows the channel member of the trolley|bogie which concerns on 1st Embodiment. FIG. 4 is a sectional view taken along line 4-4 in FIG. 3. It is a side view which shows the tow method using the trolley|bogie which concerns on 1st Embodiment. It is a side view which shows the towing method using the trolley|bogie which concerns on a comparative example (the 1). It is a side view which shows the towing method using the trolley|bogie which concerns on a comparative example (the 2). It is sectional drawing which shows the channel member of the trolley|bogie which concerns on the 1st modification of 1st Embodiment. (A) is a perspective view showing a channel member of a truck according to a second modification of the first embodiment, (B) is a perspective view showing a channel member according to the third modification, and (C) is a perspective view. It is a perspective view which shows the channel member of the trolley|bogie which concerns on 2nd Embodiment. It is a perspective view which shows the tow part of the trolley|bogie which concerns on 3rd Embodiment. It is a side view which shows the trolley|bogie which concerns on 4th Embodiment. It is a top view which shows the auxiliary coupling tool of the trolley|bogie which concerns on 4th Embodiment.

-First embodiment-
Hereinafter, the trolley|bogie which concerns on 1st Embodiment of this invention is demonstrated with reference to FIGS.

<Structure>
As shown in FIG. 1, the trolley|bogie 10 of 1st Embodiment has the loading platform 12, the traveling wheel 14 attached under the loading platform 12, and the tow part 20 provided in the side surface of the loading platform 12. There is. A pallet 41 in which luggage 40A to 40D is stacked in four stages is placed on the platform 12. The carriage 10 is connected to the connecting portion 36 of the towing vehicle 30 via the connecting member 26 connected to the towing portion 20.

[Bogie]
As shown in FIG. 2, the carrier 12 of the carriage 10 has a main body frame 120 whose outer edge is substantially square in plan view. Under the body frame 120, corner reinforcing plates 131 to 134, intermediate reinforcing plates 135 and 136, and a central reinforcing plate 137 (hereinafter collectively referred to as “reinforcing plate”) are provided. The traveling wheels 14 are provided below the reinforcing plates 131 to 137.

(Running wheel)
The outer diameter of the traveling wheel 14 is about 200 mm, and the seven traveling wheels 14 are rotatably attached to the lower surfaces of the corresponding seven reinforcing plates 131 to 137. Each of the traveling wheels 14 can be composed of a commercially available trolley caster or the like.

(Loading platform)
The main body frame 120 has four frame members 121 to 124, each of which forms four sides of a square, and one frame member 125 bridged inside the square. Like the cross-section of the frame member 123 illustrated on the traveling wheel 14 in FIG. 4, the cross-sectional shapes of the five frame members 121 to 125 are U-shaped. The frame members 121 to 125 are configured by using a channel material such as light channel steel. As a material of the frame members 121 to 125, a material other than metal such as resin can be preferably used as long as sufficient strength is secured.

Further, like the frame member 123 in FIG. 4 and the frame member 125 stacked on the right side of the frame member 123, the longitudinal ends of the frame members 121, 122, 125 are arranged in the strong axis direction of the frame members 123, 124. It is joined. The length of the frame members 121 to 125 in the longitudinal direction is about 1 m, the width orthogonal to the longitudinal direction is about 50 mm, and the height is about 35 mm. The thickness of the frame members 121 to 125 is about 4 mm. However, in the present invention, the dimensions of the frame member are not limited to these values and can be changed as appropriate.

Here, the configuration of the square corners of the body frame 120 will be specifically described. Since the four corners of the square have the same configuration as each other, the upper left corner in FIG. 2 will be representatively described.

In the upper left corner, the left end face of the frame member 121 that extends left and right on the upper side in FIG. 2 is abutted against the right side face of the upper end of the frame member 123 that extends vertically on the left side in FIG. Further, the side surface of the frame member 121 and the end surface of the frame member 123 are flush with each other. Also in the upper right corner, the lower right corner, and the lower left corner of the square in FIG. 2, similarly to the upper left corner, the end portions of the adjacent frame members 121 to 124 are butted against each other.

In addition, the frame member 125 laid across the inside of the square has its end faces in the longitudinal direction abutted on the intermediate positions of the respective inner side faces of the frame members 123 and 124 extending vertically on the left and right sides in FIG. ing. The frame member 125 extends in the pulling direction of the carriage 10 (the left-right direction in FIG. 2) in parallel with the frame members 121 and 122 extending in the left-right direction on both upper and lower sides in FIG. The strength of the main body frame 120 is increased by the frame member 125.

The seven reinforcing plates 131 to 137 are all made of metal such as steel, but as long as sufficient strength is secured, materials other than metal such as resin can be preferably used. Of the seven reinforcing plates 131 to 137, the four corner reinforcing plates 131 to 134 support the opening sides of the frame members 121 to 124 at the four corners of the square of the main body frame 120.

Further, the intermediate reinforcing plates 135 and 136 support the opening side of the frame members 123 to 125 at an intermediate position in the longitudinal direction of the left and right frame members 123 and 124 in FIG. Further, among the seven reinforcing plates 131 to 137, the central reinforcing plate 137 is arranged at the center in the longitudinal direction of the frame member 125 bridged inside the square, that is, at the center of the square of the main body frame 120.

(Corner reinforcement plate)
Since the four corner reinforcing plates 131 to 134 are all equivalent to each other, the structure will be described by using the reinforcing plate 131 at the upper left corner in FIG. 2 as a representative. The corner reinforcing plate 131 has a base plate 131A and an outer support wall 131B which is vertically provided on the outer edge of the base plate 131A.

As shown in FIG. 2, the base plate 131A has a substantially square shape in a plan view and supports the two frame members 121 and 123. The outer support wall 131B is provided on the outer edge of two adjacent sides on the upper side and the left side in FIG. 2 among the four sides of the square of the base plate 131A.

As a method of manufacturing the corner reinforcing plate 131, for example, first, a plate-shaped member whose center is bent at about 90 degrees is prepared. Then, the prepared plate-shaped member may be arranged as an outer supporting wall 131B on the outer edge of the base plate 131A in an L shape in a plan view, and the base plate 131A and the outer supporting wall 131B may be joined by welding or the like. Alternatively, it can be produced by bending or cutting the outer edge portions of two adjacent sides of one square plate member.

The L-shaped inner wall surface of the outer support wall 131B is abutted against the outer surface of the end of the frame member 121 and the end surface of the frame member 123 that are flush with each other. In other words, the positions of the frame members 121 and 123 on the base plate 131A are defined by the L-shaped outer support wall 131B.

Further, as shown in FIG. 2, an inner angle 138 is attached to the two frame members 121 and 123. The inner angle 138 has a plate shape, and the center is bent at about 90 degrees. The inner angle 138 is abutted against the inner surface of the left end portion of the upper frame member 121 in FIG. 2 and the inner surface of the upper end portion of the left frame member 123 in FIG.

2, the upper side of the L-shape of the inner angle 138, the two vertical side wall plates of the upper frame member 121 facing each other, and the upper side of the L-shape of the outer support wall 131B are illustrated. The fixing bolt does not pass through and is screwed together with the nut. Similarly, the left side of the L-shape of the inner angle 138 in FIG. 2, the two vertical side wall plates facing each other of the left frame member 123, and the left side of the L-shape of the outer support wall 131B. Has a fixing bolt (not shown) that penetrates and is screwed together with the nut. The bolt is inserted into a spacer (not shown) arranged inside the openings of the frame members 121 and 123, like the bolt 140 inserted into the spacer 142 illustrated in FIG.

Thus, in the upper left corner of the main body frame 120, four plates including the plate of the inner angle 138, the two plates of the frame members 121 and 123, and the plate of the outer support wall 131B are screwed at the same time. As a result, a large fastening force can be obtained. Similarly, at the other corners of the body frame 120, four plates are overlapped and screwed together. Thus, at the four corners of the main body frame 120, the positions of the end portions of the frame members 121 to 124 are defined by using the corner reinforcing plates 131 to 134, and the spacers inside the frame members 121 to 124 are inserted. 4 plates are piled up and screwed. Therefore, the strength of the entire body frame 120 is increased.

(Intermediate reinforcing plate)
Since the two intermediate reinforcing plates 135 and 136 have the same configuration as each other, the configuration will be described by using the left reinforcing plate 135 in FIG. 2 as a representative. The intermediate reinforcing plate 135 has a base plate 135A having a substantially square shape in a plan view, and an outer supporting wall 135B provided so as to stand vertically at the outer edge of one side of the square of the base plate 135A.

The base plate 135A supports the frame member 123 on the left side in FIG. 2 and the frame member 125 bridged inside the square. Although illustration is omitted, in the space inside the frame members 123 and 125, the side wall on the right side of the frame member 123 on the left side in FIG. 2 and the side wall on the left end portion of the frame member 125 abutted against this side wall. Are provided with through holes for inserting bolts, respectively. Fixing bolts (not shown) are screwed together with nuts in these through holes.

The outer supporting wall 135B of the intermediate reinforcing plate 135 is not an L-shaped bent like the outer supporting wall 131B of the corner reinforcing plate 131, but has a single plate shape. The outer support wall 135B of the intermediate reinforcing plate 135 can also be realized by joining plate members by welding or the like, as in the case of the outer supporting wall 131B of the corner reinforcing plate 131.

The middle portion of the left outer surface of the left frame member 123 in FIG. 2 is abutted against the inner wall surface of the outer support wall 135B. Similarly, in the right reinforcing plate 136 in FIG. 2, the middle portion of the right outer surface of the right frame member 124 in FIG. It is integrated. In this way, the intermediate reinforcing plates 135 and 136 increase the strength of the intermediate portions of the frame members 123 and 124 on the two sides of the main body frame 120.

In addition, fixing bolts 140A and 140B penetrate through the outer support wall 135B, the two vertical side wall plates facing each other of the frame member 123, the pedestal 150 of the pulling portion 20, and the channel member 22, It is screwed together with the nuts 140A and 140B. The pedestal 150 and the channel member 22 will be described later.

(Center reinforcement plate)
As shown in FIG. 2, the center reinforcing plate 137 is provided at the center in the longitudinal direction of the frame member 125 spanning the inside of the square of the main body frame 120, that is, at the center of the loading surface of the luggage 12 on which the loads 40A to 40D are mounted. ing. The center reinforcing plate 137 is attached to the frame member 125 via two L-shaped attachment angles 139A and 139B. The mounting angles 139A and 139B are butted against the side surface of the frame member 125 and the upper surface of the center reinforcing plate 137 at the same time.

A fixing bolt (not shown) penetrates the mounting angles 139A and 139B and the frame member 125, and is screwed together with the nut. Similarly, a fixing bolt (not shown) penetrates the mounting angles 139A and 139B and the central reinforcing plate 137, and is screwed together with the nut.

The center reinforcing plate 137 enables the pallet 41 and the loads 40A to 40D to bear the load not only on the four sides of the main body frame 120 but also in the center. Therefore, it is possible to effectively disperse the load that the main body frame 120 bears and to reduce the load that is applied to each of the plurality of running wheels 14.

Note that the reinforcing plates 131 to 137 are not essential configurations in the present invention. However, in the trolley|bogie 10 which concerns on 1st Embodiment, the strength of the whole main-body frame 120 can be greatly improved by the reinforcement plates 131-137. Therefore, for example, even heavy loads 40A to 40D of 1 ton or more can be stably mounted on the carriage 10 and the carriage 10 can be towed. In addition, since the reinforcing plates 131 to 137 can reduce the load on the traveling wheels 14, the life of the truck 10 can be extended.

(Towing section)
As shown in FIGS. 1 and 2, the tow portion 20 includes a channel member 22 and an adjusting bolt 24. As shown in FIG. 2, the channel member 22 is fixed to the outer side surface of the frame member 123 of the cargo bed 12 via bolts 140A and 140B and nuts 140A and 140B via a plate-shaped pedestal 150.

The height of the pedestal 150 is higher than that of the luggage carrier 12 as shown in FIG. 1, and when the upper surface of the pedestal 150 and the upper surface of the luggage carrier 12 are aligned as shown in FIG. 4, the lower end of the pedestal 150 is below the luggage carrier 12. Project to. Therefore, a large bonding area of the channel member 22 to the pedestal 150 can be secured, and the fixing force of the channel member 22 to the side surface of the cargo bed 12 can be increased. The pedestal 150 is not essential if the channel member 22 alone can be sufficiently fixed to the side surface of the luggage carrier 12.

As shown in FIG. 3, the channel member 22 has a channel portion 220 that forms a quadrangular prism-shaped space inside, and flange portions 222 provided at both ends of the channel portion 220. The bottom surface of the quadrangular prism in the space inside the channel portion 220 has a rectangular shape. The channel member 22 can be manufactured by bending a plate-shaped member made of metal such as steel.

An elongated hole 22A extending in the height direction is formed in the channel portion 220 in a region facing the towing vehicle 30. The upper end of the long hole 22A of the first embodiment is open. The long hole 22A serves as a communication portion between the rectangular column-shaped space inside the channel portion 220 and the outside.

The flange portion 222 projects outward from both ends of the channel portion 220. The flange portion 222 is provided with a mounting hole 222A penetrating along the thickness direction (horizontal direction). The threaded portions of bolts 140A and 140B for fixing the channel member 22 to the side surface of the luggage carrier 12 are inserted into the mounting holes 222A.

As shown in FIG. 3, the adjustment bolt 24 has a head portion 24A and a screw portion 24B, and is inserted into the elongated hole 22A of the channel portion 220. That is, the head portion 24A is housed in the space inside the channel portion 220. The threaded portion 24B projects from the elongated hole 22A to the outside of the channel portion 220. The head 24A has a quadrangular prism shape, and the bottom surface and the side surface of the quadrangular prism have a rectangular shape. The head 24A housed in the space inside the channel portion 220 has a rectangular side surface of a quadrangular prism on the front surface in a plan view. Further, the screw portion 24B has a cylindrical shape. Note that, in FIG. 3, the adjustment bolt 24 is illustrated as floating inside the elongated hole 22A for the sake of description.

The opening width W (diameter of the arc portion) W measured along the horizontal direction of the long hole 22A is the same as or slightly larger than the nominal diameter of the threaded portion 24B of the adjusting bolt 24, and the side surface of the square pole of the head portion 24A. It is smaller than the length of the long side. In FIG. 3, the long sides of the side surfaces of the quadrangular prism of the head 24A extend in the left-right direction. Further, in the space inside the channel portion 220, a slight gap is formed between the head portion 24A of the adjustment bolt 24 and the side wall of the surrounding channel portion 220. Therefore, the adjustment bolt 24 does not rotate while maintaining the state in which the head portion 24A is housed in the inner space and is slidable in the height direction.

As shown in FIG. 4, a nut 28 and a washer 160 are attached to the outer peripheral surface of the screw portion 24B of the adjustment bolt 24. The outer diameter (maximum width) of the nut 28 and the washer 160 is larger than the opening width W of the elongated hole 22A. The nut 28 sandwiches the area around the elongated hole 22A of the channel portion 220 with the head portion 24A. In the present invention, the washer 160 is not essential as long as the elongated hole 22A can be sufficiently sandwiched between the adjusting bolt 24 and the nut 28.

The adjustment bolt 24 is fixed to the channel member 22 by holding the channel portion 220 between the head portion 24A and the nut 28 while keeping the axial direction horizontal and maintaining a constant height. In this way, the adjusting bolt 24 is slidable in the height direction inside the elongated hole 22A, and the mounting height is maintained at an arbitrary level, so that the towing portion 20 is fixed to the loading platform 12 in height. Adjusted and fixed.

[Connecting member]
As shown in FIG. 2, the connecting member 26 is a rectangular plate in plan view and extends between the carriage 10 and the towing vehicle 30 with its plate surface substantially horizontal. The connecting member 26 is made of metal such as steel, but may be made of a material other than metal such as resin. A female screw hole 26A is provided at the right end in FIG. 2 of the connecting member 26, and a through hole 26B is provided at the left end.

As shown in FIG. 4, the female screw hole 26A is opened in the right end surface of the connecting member 26 facing the carriage 10. Further, the female screw hole 26A is formed by being dug substantially horizontally inside the connecting member 26 from the opening toward the towing vehicle 30 side, and the inner wall surface is provided with a female screw. The tip of the screw portion 24B of the adjusting bolt 24 is fed into the inside of the female screw hole 26A, and the screw portion 24B and the female screw hole 26A are screwed together. By this screw tightening, the connecting member 26 and the adjusting bolt 24 are connected.

The through hole 26B is formed at the left end of the connecting member 26 on the side of the towing vehicle 30 in FIG. The connecting rod 36C of the connecting portion 36 of the towing vehicle 30 is inserted into the through hole 26B (see FIG. 1). A slight gap is provided between the inner peripheral surface of the through hole 26B and the outer peripheral surface of the connecting rod 36C, and the connecting member 26 is rotatably attached about the axis of the connecting rod 36C.

Note that the nut 28 is not essential if the height position of the pulling portion 20 can be fixed by sandwiching the channel member 22 between the female screw hole 26A of the connecting member 26 and the adjusting bolt 24 without using the nut 28.

[Tractor]
The towing vehicle 30 is a small one-seater electric towing vehicle, and as shown in FIG. 1, a vehicle body 32 and front wheels 34A and rear wheels 34B rotatably attached to the vehicle body 32, respectively. , And a connecting portion 36 provided at the bottom of the vehicle body 32. Although not shown, another rear wheel paired with the illustrated rear wheel 34B is provided coaxially with the rear wheel 34B at a position on the far side of the paper surface of FIG.

The connecting portion 36 is provided below the vehicle body 32 and on the rear side in the traveling direction of the towing vehicle 30. The connecting portion 36 has a substrate 36A, a holding plate 36B provided on the substrate 36A with a space, and a connecting rod 36C extending between the substrate 36A and the holding plate 36B. One end of the board 36A is attached to a lower position near the ground in a region of the lower portion of the vehicle body 32 facing the truck 10, and the other end extends substantially horizontally toward the truck 10. The height of the substrate 36A of the connecting portion 36 from the ground is about 50 mm to about 80 mm.

The connecting rod 36C is provided on the upper surface of the substrate 36A so as to stand substantially vertically. The connecting rod 36C is joined to the upper surface of the substrate 36A by welding or the like. One end of the pressing plate 36B is attached to the vehicle body 32 by, for example, a hinge, and the other end is rotatable around the attachment position. By rotating the other end of the pressing plate 36B so as to approach the vehicle body 32, the lower surface of the other end is separated from the upper end of the connecting rod 36C, and the space above the connecting rod 36C is opened. On the contrary, by rotating the other end of the pressing plate 36B away from the vehicle body 32, the lower surface of the other end comes close to the upper end of the connecting rod 36C, and the space above the connecting rod 36C is covered.

<How to pull>
Next, a method of pulling the carriage 10 according to the first embodiment will be described with reference to FIG. First, it is assumed that the luggage 12 of the carriage 10 is loaded with luggage 40A to 40D having a weight of about 1 ton. The traveling wheels 14 of the truck 10 have a large diameter in accordance with the heavy loads 40A to 40D, and the height of the truck 12 is higher than that of the connecting portion 36 of the towing vehicle 30.

The towing vehicle 30 is small, and the weight of the towing vehicle 30 is, for example, about 200 kg to 400 kg. That is, the trolley 10 on which the luggage 40A to 40D is placed is heavier than the tow vehicle 30 in a state in which an adult operator having an average weight is on board. The weights of the luggage 40A to 40D and the towing vehicle 30 in the first embodiment are merely examples, and the present invention is not limited to these.

Next, as shown in FIG. 3, the slot 22A of the channel member 22 is opened so that the head portion 24A of the adjustment bolt 24 of the pulling portion 20 is housed in the space inside the channel portion 220 of the channel member 22. Insert the adjusting bolt 24 from the part. At this time, the threaded portion 24B of the adjustment bolt 24 extends to the outside of the channel member 22. The nut 28 and the washer 160 may be inserted and fitted into the tip end portion on the peripheral surface of the screw portion 24B before the adjustment bolt 24 is inserted into the elongated hole 22A.

Then, the washer 160 is inserted from the outside of the channel member 22 into the threaded portion 24B of the adjusting bolt 24, and the nut 28 is rotated from the outside to be fed to the head 24A side. At this time, the nut 28 is arranged slightly away from the elongated hole 22A so as not to come into close contact with the channel member 22 together with the washer 160 when the axial direction of the adjustment bolt 24 is horizontal. That is, the nut 28 does not sandwich the area around the elongated hole 22A of the channel member 22 with the head portion 24A of the adjustment bolt 24, but is loosely fitted to the screw portion 24B. Further, since the nut 28 and the washer 160 are attached to the threaded portion 24B, the tip of the threaded portion 24B jumps upward due to the weight of the head portion 24A of the adjustment bolt 24, and the adjustment bolt 24 falls off from the channel member 22. Is prevented.

Next, as shown in FIG. 5, the connecting rod 36C of the connecting portion 36 of the towing vehicle 30 is inserted into the through hole 26B of the connecting member 26 to connect the connecting member 26 to the towing vehicle 30. Further, the tip end of the screw portion 24B of the adjusting bolt 24 is fed into the female screw hole 26A of the connecting member 26 and screwed. The tightening strength between the adjusting bolt 24 and the connecting member 26 is such that they are not separated and the adjusting bolt 24 is slidable.

Next, the adjustment bolt 24 is slid vertically in the elongated hole 22A, and the height position of the adjustment bolt 24 is changed and adjusted so that the connecting member 26 is level with the heights of both ends aligned. Then, at the adjusted height position, the nut 28 is rotated on the peripheral surface of the screw portion 24B and fed to the head portion 24A side until the nut 28 comes into close contact with the channel member 22 via the washer 160. By this screw tightening, the region around the elongated hole 22A of the channel member 22 is firmly sandwiched by the head portion 24A and the nut 28. By this clamping, the state in which the connecting member 26 is at the level is maintained during the towing by the towing vehicle 30.

<Comparative example>
On the other hand, FIG. 6 illustrates a carriage 100 according to a comparative example in which the mounting height of the towing unit 200 on the luggage carrier 12 is not adjusted. The towing portion 200 of the cart 100 of the comparative example is configured by a plate-shaped or rod-shaped member.

One end of the towing unit 200 is attached to, for example, the frame member 123 of the luggage carrier 12 via a fixture such as a hook (not shown), and the other end is vertically and horizontally centered on the attachment position of the one end on the luggage carrier 12 side. It is freely rotatable. Further, the other end of the towing unit 200 is connected to the connecting unit 36 of the towing vehicle 30. As shown in FIG. 6, the attachment height of the one end of the towing unit 200 to the luggage carrier 12 is higher than that of the connecting unit 36 of the towing vehicle 30. The configuration of the carriage 100 of the comparative example other than the towing unit 200 is the same as that of the carriage 10 of the first embodiment.

In the case of the comparative example, since the attachment height of the towing unit 200 to the luggage carrier 12 is not adjusted, the connecting member 26 does not reach the level. Therefore, when the towing vehicle 30 tries to move to the opposite side of the truck 100 in order to pull the truck 100 in the stopped state, as shown by an arrow pointing to the upper right in FIG. A force that lifts the wheels 34B is generated. Then, as shown in FIG. 7, the rear wheel 34B of the towing vehicle 30 is lifted from the ground and slips due to the generated force. The slip of the rear wheel 34B is caused not only when the towing vehicle 100 in a stopped state is started, but also when the towing vehicle 30 gets over the unevenness formed on the ground during towing, the position of the connecting portion 36. Can also occur when changes are low.

(Action effect)
According to the trolley|bogie which concerns on 1st Embodiment, the attachment height with respect to the luggage carrier 12 of the tow part 20 can be adjusted and fixed. Therefore, when the height of the connecting portion 36 of the towing vehicle 30 is low, the height of the towing portion 20 is lowered so that the heights of the connecting portion 36 and the towing portion 20 are at the same level. By adjusting the height of the towing portion 20 in this manner, when the height of the towing portion 20 is higher than that of the connecting portion 36, no force is generated to lift the rear wheel 34B of the towing vehicle 30 via the connecting member 26. You can Further, since the towing unit 20 is adjusted in height and fixed to the luggage carrier 12, the height does not change during towing. For this reason, slippage of the rear wheels 34B of the towing vehicle 30 can be suppressed, and even the relatively lightweight and small towing vehicle 30 can stably tow the truck 10 on which the heavy load is placed on the luggage carrier 12.

Further, according to the first embodiment, by inserting the adjusting bolt 24 into the elongated hole 22A formed in the channel member 22 fixed to the side surface of the luggage carrier 12 and moving the adjusting bolt 24 up and down in the elongated hole 22A, The mounting height of the adjusting bolt 24 can be changed. A connecting member 26 is connected to the tip of the screw portion 24B of the adjusting bolt 24, and the height of the adjusting bolt 24 is adjusted according to the height of the connecting portion 36 of the towing vehicle 30 to which the connecting member 26 is connected. it can. Further, by sandwiching the region of the channel member 22 around the elongated hole 22A between the head portion 24A of the adjustment bolt 24 and the nut 28, the adjusted mounting height of the adjustment bolt 24 can be fixed.

Particularly, in recent logistics sites, there is an increasing demand for delivering a large amount of products (packages) to customers in a short delivery time, so that the amount of one package 40A to 40D mounted on the carriage 10 tends to increase. .. According to the trolley|bogie 10 which concerns on 1st Embodiment, even if the existing tow truck 30 is comparatively small with respect to the trolley|bogie 10 in which the heavy object was mounted, since the connection member 26 can be leveled and towed stably, There is no need to modify the connecting portion 36 of the towing vehicle 30 or replace the towing vehicle. Therefore, it is possible to suppress the cost related to the work of pulling a large amount of luggage.

<Modification>
Next, the bogies according to the first to third modifications of the first embodiment will be described with reference to FIGS. 8 to 9B. In addition, about the structure similar to the trolley|bogie 10 of 1st Embodiment shown in FIGS. 1-5, the same code|symbol is attached|subjected and description is abbreviate|omitted and it demonstrates centering around difference.

(First modification)
As shown in FIG. 8, in the truck 50 of the first modified example, the channel member 52 extends not only below the luggage carrier 12 but also above it. The long hole 52A also extends from the upper end of the channel member 52 to the traveling wheels 14 below the luggage carrier 12. Therefore, the adjustment bolt 24 can be slid not only on the lower side of the luggage carrier 12 but also on the upper side thereof, so that the height of the connecting member 26 coupled to the adjustment bolt 24 can be made higher than that of the luggage carrier 12. The range of adjustment is expanded.

(Second modified example)
As shown in FIG. 9(A), in the bogie of the second modification, the slot 62A of the channel member 62 has arcuate portions formed at both the upper end and the lower end, and the upper end is not open. The long hole 62A of the second modification extends in the up-down direction similarly to the long hole 22A shown in FIG. 3, and the space inside the channel portion 622 communicates with the outside by the long hole 62A. Therefore, also in the truck of the second modified example, the adjustment bolt 24 can be mounted and fixed to the loading platform 12 in a height-adjustable manner by using the long hole 62A.

(Third modification)
As shown in FIG. 9(B), in the bogie of the third modification, the slot 72A of the channel member 72 is open at the upper and lower ends. Specifically, the long hole 72A is realized by a gap between the facing end surfaces of the two plate-shaped channel portions 720 and 722. The long hole 72A of the third modified example extends in the up-down direction similarly to the long hole 22A shown in FIG. 3, and the inside of the hole 72A surrounded by the two plate-shaped channel portions 720 and 722 is surrounded by the long hole 72A. The space communicates with the outside. Therefore, also in the truck of the third modified example, the adjustment bolt 24 can be mounted and fixed to the loading platform 12 in a height-adjustable manner by using the long hole 72A.

-Second embodiment-
Next, a trolley|bogie which concerns on 2nd Embodiment of this invention is demonstrated with reference to FIG.9(C). The same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described.

<Structure>
The trolley|bogie of 2nd Embodiment is similar to the trolley|bogie 10 of 1st Embodiment shown in FIG. 1, and has a loading platform, the traveling wheel attached under the loading platform, and the tow part provided in the side surface of the loading platform. Have As shown in FIG. 9C, in the bogie of the second embodiment, the channel portion 720 of the channel member 82 is provided with a plurality of through holes 82A in the vertical direction instead of the elongated holes. The plurality of through holes 82A are arranged on the same straight line at substantially equal intervals, and the plurality of through holes 82A allow the space inside the channel portion 822 to communicate with the outside.

The through hole 82A through which the adjustment bolt 24 is inserted is appropriately selected from the plurality of through holes 82A in accordance with the height of the end of the connecting member 26 on the towing vehicle 30 side. The region of the channel member 82 around the selected through hole 82A is clamped by the head portion 24A of the adjusting bolt 24 and the nut 28, whereby the adjusting bolt 24 is mounted and fixed to the luggage carrier 12 in a height-adjustable manner. be able to.

It should be noted that by expanding the width of the channel portion 822 along the horizontal axial direction (pulling direction) of the adjustment bolt 24, it becomes possible to expand the inner space that can be used for inserting fingers. If the enlarged inner space is used, the adjustment bolt 24 can be easily grasped with fingers, and the work of replacing the through hole 82A and inserting the adjustment bolt 24 again can be facilitated.

-Third Embodiment-
Next, a trolley|bogie which concerns on 3rd Embodiment of this invention is demonstrated with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described.

<Structure>
The trolley|bogie of 3rd Embodiment is similar to the trolley|bogie 10 of 1st Embodiment shown in FIG. 1, and has a loading platform, the traveling wheel attached under the loading platform, and the tow part provided in the side surface of the loading platform. Have As shown in FIG. 10, in the trolley|bogie of 3rd Embodiment, instead of the channel member 22 of 1st Embodiment, the fitting base member 92 is provided as a pulling part in the side surface of the loading platform of a trolley|bogie. Specifically, the fitting base member 92 has a block-shaped fitting base portion 922 provided between the flange portions 222, and a plurality of fitting base members 922 are provided on the side surface of the fitting base portion 922 on the towing vehicle 30 side. The fitting recesses 92A and 92B are arranged along the vertical direction.

Each of the fitting recesses 92A and 92B is a quadrangular prism-shaped recess having the same size, and the bottom surface of the quadrangular prism has an isosceles trapezoidal shape. Further, a square columnar fitting convex portion 262 is provided on the end surface of the connecting member 260 on the dolly side (the right rear side in FIG. 10). The shape of the square pillar of the fitting convex portion 262 corresponds to the square pillar of the fitting concave portions 92A and 92B.

The fitting recesses 92A and 92B into which the connecting member 260 is fitted are appropriately selected from among the plurality of fitting recesses 92A and 92B according to the height of the end of the connecting member 260 on the towing vehicle 30 side. By horizontally inserting the fitting protrusions 262 of the connecting member 260 into the selected fitting recesses 92A and 92B and fitting them, the connecting member 260 is mounted and fixed on the luggage carrier 12 in a height-adjustable manner. be able to.

According to the cart of the third embodiment, the worker can adjust the mounting height to the luggage carrier 12 simply by gripping the connecting member 260 and inserting the fitting convex portion 262 into the fitting concave portions 92A and 92B. The trouble of screwing the nut 28 as in the case of the first embodiment is unnecessary. Further, the number of members of the towing unit can be suppressed to be smaller than that in the first embodiment. Other effects of the bogie of the third embodiment are similar to those of the first embodiment.

-Fourth Embodiment-
Next, a trolley|bogie which concerns on 4th Embodiment of this invention is demonstrated with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described.

<Structure>
As shown in FIG. 11, the carriage 300 of the fourth embodiment is similar to the carriage 10 of the first embodiment shown in FIG. 1, and has a carrier 12, a traveling wheel 14 attached below the carrier 12, and a carrier 12. And a tow portion 20 provided on the side surface of 12. A pallet 41 in which luggage 40A to 40D is stacked in four stages is placed on the loading platform 12. The carriage 300 is connected to the connecting portion 36 of the towing vehicle 30 via the connecting member 26 connected to the towing portion 20.

The trolley|bogie 300 of 4th Embodiment is connected with the following trolley|bogie 310 via the auxiliary connection tool (94, 96, 98). Further, another succeeding carriage 320 is also connected to the succeeding carriage 310 via auxiliary connectors (94, 96, 98).

The auxiliary connector (94, 96, 98) has a leading side connecting plate 94, a trailing side connecting plate 96, and a connecting pin 98. As shown in FIG. 12, the leading-side connecting plate 94 is plate-shaped and has one end provided on the side surface of the cargo bed 12 opposite to the pulling section 20 by using a fixing means such as screw fastening (not shown). ing. The other end of the leading side connecting plate 94 extends toward the succeeding carriage 310, and the other end is provided with a connecting hole 94A penetrating in the thickness direction.

The trailing side connecting plate 96 is plate-shaped, and one end thereof is provided on the side surface of the luggage carrier 312 of the trailing carriage 310 by using fixing means such as screw tightening not shown. The other end of the trailing side connecting plate 96 extends toward the preceding bogie 300, and the other end is provided with a connecting hole 96A penetrating in the thickness direction with a diameter substantially the same as that of the connecting hole 94A.

The leading-side connecting plate 94 of the preceding bogie 300 and the trailing-side connecting plate 96 of the following bogie 310 extend horizontally at different height positions, and the surfaces facing each other overlap. Further, the connecting hole 94A of the leading side connecting plate 94 and the connecting hole 96A of the trailing side connecting plate 96 are aligned coaxially. The leading trolley 300 and the trailing trolley 310 are coupled by inserting the coupling pin 98 through the aligned coupling holes 94A and 96A.

According to the trolley|bogie 300 of 4th Embodiment, since it becomes possible to connect the trolley|bogie 310 of the following to the trolley|bogie 300 of the front via the auxiliary connection tool (94, 96, 98), a large amount can be pulled by one time. The heavy objects can be moved, and the work efficiency can be improved. Further, as shown in FIG. 11, by using a plurality of auxiliary connecting members (94, 96, 98) to connect and integrate three or more carriages, it is possible to move a load that can be moved by one traction. The amount can be increased further. Other effects of the bogie of the fourth embodiment are similar to those of the first embodiment.

Although the present invention has been described by the above disclosed embodiments, it should not be understood that the descriptions and drawings forming a part of this disclosure limit the present invention. For example, the configurations of the respective embodiments shown in FIGS. 1 to 12 may be combined. The present invention includes various embodiments not described above, and the technical scope of the present invention is defined only by the matters specifying the invention in the scope of claims appropriate from the above description.

10 Cart 12 Cargo 14 Traveling Wheel 20 Traction 22 Channel Member 22A Long Hole 24 Adjustment Bolt 24A Head 24B Screw 26 Connection Member 28 Nut 30 Traction Vehicle 36 Connection 40A-40D Luggage

Claims (2)

A loading platform on which luggage can be placed,
Traveling wheels attached to the platform,
A height is adjusted and fixed with respect to the cargo bed, and a towing portion to which a connecting member connected to a connecting portion of the tow vehicle is connected,
With a carriage. The towing section is
A channel member fixed to the side surface of the carrier,
An elongated hole formed in the channel member in the height direction,
It is slidably inserted into the elongated hole in the height direction, the head is located inside the channel member, the connecting member is connected to the tip end of the screw portion, and the channel member is connected to the channel member from the outside of the channel member. Adjusting bolt to be fixed,
The trolley according to claim 1, further comprising: