JPH11139571A - Vehicle loading and unloading bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle loading/unloading bridge capable of grounding the whole lower face of a bridge rear end section when it is used for multiple trailers and motor trucks different in deck height, capable of locating the load fulcrum on the bridge rear end section side on the bridge inner side, capable of minimizing a bridge span, avoiding the floating of the tip side of the bridge rear end section, and capable of preventing the jumping up of a bridge front end section. SOLUTION: This vehicle loading/unloading bridge is constituted of a bridge main body 4 having a hook 3 hooked on a hook receiver 2 provided on a trailer or a motor truck at a front end section and a grounding member 5 pivotally connected vertically rotatably to the rear end section of the bridge main body 4 and having a nearly triangular shape on the side view.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge (also referred to as a conductive plate) used for loading and unloading a self-propelled heavy vehicle such as a construction machine such as a crawler crane on a bed of a trailer or a truck.

[0002]

2. Description of the Related Art A bridge of this type, which has been conventionally used, has a hook at a front end which is hooked on a hook receiver provided at a rear end of a bed of a trailer or a truck, and the rear end is viewed from a side. The bridge is formed as a triangular shape so that the lower surface of this portion is grounded to the ground, and is integrally formed of an aluminum alloy, high-strength steel, or the like.

[0003]

As described above, since the conventional bridge is formed as a single unit integrally formed as a whole, if one bridge is shared by a plurality of trailers or trucks having different loading heights, the loading capacity is reduced. When the height is high, only the rear end of the bridge rear end of the triangular shape in side view is in contact with the ground, and most of the lower surface of the rear end is in a floating state. Only the front end touches the ground, and the rear end rises.

[0004] However, when only the rear end of the bridge rear end is grounded as in the former case, the load span between both fulcrums when the bridge is assumed to be a support beam at both ends becomes long.
The bending moment acting on the bridge when loading and unloading the vehicle becomes larger, causing a problem in strength. In the case where the rear end of the lower surface of the rear end of the bridge rises as in the case of the latter, if the vehicle steps on the rear end of the bridge in order to get on the bridge when loading the vehicle, the bridge will act on the hook by the action of the balance. There is a danger that a certain front end will jump up and fall off from a carrier such as a trailer.

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it possible to stably ground the rear end of a bridge even when the height of a trailer or truck bed changes, thereby avoiding lifting of the rear end of the bridge. It is a primary object of the present invention to provide a vehicle loading / unloading bridge which can prevent the front end of the bridge from jumping up, can be used safely, can shorten the load span as much as possible, and is extremely effective in terms of strength. Another object of the present invention is to provide a vehicle loading / unloading bridge capable of preventing the vehicle from slipping at the time of loading / unloading the vehicle, preventing wear and breakage of the bridge body, and further reducing the weight of the bridge. It is to be.

[0006]

As shown in FIG. 2, a vehicle loading / unloading bridge 1 according to the first aspect of the present invention includes a hook 3 hooked on a hook receiver 2 provided on a trailer or a truck. The bridge body 4 includes a bridge body 4 at a front end thereof, and a grounding member 5 having a substantially triangular shape in a side view and pivotally connected to a rear end of the bridge body 4 so as to be vertically rotatable.

According to a second aspect of the present invention, in the vehicle loading / unloading bridge 1 according to the first aspect, a non-slip protective cover member 7, 8 is mounted on each of the upper surfaces of the bridge body 4 and the grounding member 5. It is.

A third aspect of the present invention is the vehicle loading / unloading bridge 1 according to the first or second aspect.
The grounding member 5 is formed by rectangular tubular members 9 and 10 having a rectangular cross section and hollow inside.

According to a fourth aspect of the present invention, in the vehicle loading / unloading bridge 1 according to the second or third aspect, the projecting ridges 9a, 9a, 10b are provided at both ends in the width direction of the upper flat surfaces of the rectangular tubular members 9, 10.
9a, 10a, 10a are formed, and both ridges 9a, 9a,
The protective cover members 7, 8 which are held by 10a, 10a and which are thicker than the ridges 9a, 10a are provided.

[0010]

1 (A) and 1 (B) are a plan view and a side view showing a state in which a vehicle loading / unloading bridge 1 according to the present invention is mounted on a bed R of a trailer T. FIG. Note that the illustration of the trailer T is omitted in FIG. As shown in FIG. 1A, a pair of bridges 1 are mounted on the left and right sides of the rear end of the loading platform R, respectively. Each bridge 1 will be described in detail below with reference to FIGS.

As shown in FIG. 2, the bridge 1 has a bridge body 4 having a hook 3 at a front end hooked on a hook receiver 2 provided at a rear end of a bed R of a trailer T; And a grounding member 5 having a substantially triangular shape in a side view and pivotally connected to a rear end portion of the bridge body 4 so as to be vertically rotatable. The upper surface of the bridge body 4 and the upper surface of the grounding member 5 are non-slip. Dual-purpose protective cover members 7 and 8 are respectively mounted.

As shown in FIGS. 3A to 3E, the bridge body 4 and the grounding member 5 are formed by rectangular tubular members 9 and 10 each having a rectangular cross section and hollow inside. Each of the rectangular tubular members 9 and 10 is made of a strong aluminum alloy or high tensile steel. The upper flat surface of the rectangular tubular member 9 forming the bridge body 4 is provided with ridges 9 at both ends in the width direction.
a and 9a are formed, and as shown in FIG. 3 (E), a non-slip protective cover member 7 thicker than the protruding height of the protruding portions 9a is held between the protruding portions 9a. I have. The cover member 7 may be made of wood, an aluminum plate,
What consists of a rubber plate, a plastic plate, etc. may be used. Further, the square tubular member 9 is provided with a plurality of cutout windows 9b on each of the left and right side walls to reduce the weight.

A hook forming plate 11 for forming the hook 3 is bolted to a front end of the rectangular tubular member 9 via a mounting base plate 12. A plurality of reinforcing ribs 11a are formed on an upper portion of the hook forming plate 11. In addition, the square tubular member 9
At the rear end, a U-shaped piece 13 that forms a part of the pivot connecting portion 6 is formed by welding (or may be bolted) in a plan view. Insertion hole 1
3a is provided. A non-slip protective cover member 7 is also mounted on the upper surface of the U-shaped piece 13.

The rectangular tubular member 10 forming the grounding member 5 includes:
As shown in FIG. 3B, the upper surface is formed in a substantially right-angled triangular shape such that the upper surface is a bottom side and the lower surface is a hypotenuse.
As shown in FIG. 3 (D), on the upper flat surface, ridges 10a, 10a are formed at both ends in the width direction except for the tip side, and the ridges 10a are formed between the ridges 10a. A non-slip protective cover member 8 having a thickness greater than the protruding height of the ridge 10a is held. The cover member 8 may be made of wood or an aluminum plate, a rubber plate, a plastic plate, or the like. Further, the square tubular member 10 is provided with a cutout window 10b on each of the left and right side walls to reduce the weight.

At the rear end of the rectangular tubular member 10, a rear end of the grounding member 5 and a part of the pivotal connection 6 are formed to form a U-shaped piece of the rectangular tubular member 9. A protruding piece 14 that can be fitted to 13 is integrally formed, and the protruding piece 14 is provided with a bolt insertion hole 14a. The upper surface of the front end portion of the rectangular tubular member 10 is formed in an arc shape in a side view.

In order to pivotally connect the ground member 5 to the bridge body 4, as shown in FIG. 3C, the projecting piece 14 on the ground member 5 side is connected to the U-shaped portion on the bridge body 4 side. Piece 1
3, a bolt 15 is inserted between the pin hole 13 a of the U-shaped piece 13 and the bolt hole 14 a of the protruding piece 14, and a nut 16 is screwed into the tip of the bolt 15. The retaining split pin 17 may be inserted into the pin hole 15a.

In using the vehicle loading / unloading bridge 1 constructed as described above, when the front end side of the bridge main body 4 is lifted as shown by the solid line in FIG. 2, the grounding member 5 remains in contact with the ground GL. Since only the bridge body 4 pivots upward around the pivot connection 6 at the rear end, the hook 3 at the front end of the bridge body 4
Only on the hook receiver 2 of the loading platform R. At this time, the entire lower surface of the grounding member 5 in the longitudinal direction is the ground GL.
Touch

When the bridge 1 is used for a trailer or a truck having a different platform height, for example, as shown by a virtual line in FIG.
When used on a trailer higher than that, the front end side of the bridge body 4 is lifted appropriately higher than the case of the loading platform R, and the hook 3 is hooked on the hook receiver 2 of the loading platform R 'of the trailer as shown in the phantom line. It should be done. Again,
The entire lower surface of the grounding member 5 in the longitudinal direction is grounded to the ground GL. The grounding state of the grounding member 5 is the same even when the height of the bed is lower than the bed R shown by the solid line in FIG.

When the ground surface of the ground member 5 is inclined due to the unevenness of the ground GL, only the ground member 5 is connected to the bridge body 4 in accordance with the inclined surface.
The bridge body 4 can be turned up and down around the pivotal connection portion 6, and the entire lower surface of the grounding member 5 can be grounded on the inclined surface while the bridge main body 4 is in the same posture.

When the grounding member 5 comes into contact with the ground GL, the front end position of the grounding member 5 (the protruding end position of the protruding piece 14).
As can be seen from FIG. 2, the vehicle is located closer to the bridge main body 4 than the position of the pivot connecting portion 6, so that when the vehicle is loaded, the vehicle rides on the grounding member 5 and the vehicle load is reduced. When located on the portion 6, there is no possibility that the rear end side of the grounding member 5 will jump up, and the grounding member 5 can be constantly grounded in a stable state.

FIG. 4 shows another structure of the pivot connecting portion 6 for pivotally connecting the bridge body 4 and the grounding member 5. As shown in FIG. 1A, the pivotal connecting portion 6 has a hook-shaped engaging piece 18 protruding from the rear end of the rectangular tubular member 9 forming the bridge body 4, while the grounding member is provided. A protruding strip 19 with which the engaging piece 18 engages protrudes from the inner rear end side of the rectangular cylindrical member 10 having a rear end opened to form the rear end 5. Bolt insertion holes 20 and 20 are provided on both sides of the upper portion of the projecting strip piece 19 at a position higher than the projecting height of the projecting strip piece 19, and as shown in FIGS. The engaging piece 18 is connected to the convex strip 19 on the grounding member 5 side.
After the bolt 21 is engaged with the bolt insertion hole 20,
The hook-shaped engaging portion 18 on the bridge body 4 is pivotally movable between the ridge 19 and the bolt 21 on the grounding member 5 side. Will be retained. FIG. 4A shows a state in which the non-slip cover members 7 and 8 are removed from the upper surfaces of the bridge body 4 and the ground member 5, respectively.

As described above, in the vehicle loading / unloading bridge 1 according to the present invention, when the vehicle 1 is used commonly for trailers and trucks having different loading heights, or when the ground GL has an uneven shape, the contact of the grounding member 5 is made. Even when the ground is inclined, the grounding member 5 can be stably grounded on the ground GL over the entire longitudinal direction thereof. There is no danger that the front end of the bridge 1 will be jumped up by stepping on the part, so that the bridge main body 4 can be prevented from falling off.

Further, since the grounding member 5 can be grounded over the entire area in the longitudinal direction as described above, the load fulcrum at the rear end of the bridge when the bridge 1 is a support beam at both ends is located as far forward as possible. Can be
As a result, the span between the load supports at both ends can be shortened,
It is advantageous in terms of strength, and the weight of the bridge 1 can be reduced. In this case, if the length of the grounding member 5 is made as long as possible, the span between the load fulcrums at both ends becomes shorter, which is more effective.

In the bridge 1, since the non-slip protective cover members 7 and 8 are mounted on the upper surfaces of the bridge body 4 and the grounding member 5, respectively, the vehicle is prevented from slipping when the vehicle is unloaded. The above safety can be ensured, and the wear and breakage of the bridge body 4 and the grounding member 5 can be prevented as much as possible, so that the service life can be extended. Since the bridge main body 4 and the grounding member 5 are formed of rectangular tubular members 9 and 10 having rectangular cross sections and hollow insides, the weight of the bridge 1 can be reduced. Further, at both ends in the width direction of the upper flat surfaces of the rectangular tubular members 9 and 10, ridges 9a,
9a, 10a, 10a are formed, and both ridges 9a, 9a,
Since the non-slip protective cover members 7, 8 which are held by 10a, 10a and which are thicker than the both ridges are mounted, the non-slip protective cover members 7, 8 at the time of loading / unloading the vehicle fall off. Can be prevented, and the cover member 7,
8, the running portion of the vehicle does not directly rub against the bridge main body 4 and the grounding member 5, and the bridge main body 4 and the grounding member 5 can be reliably protected.

[0025]

According to the bridge for loading and unloading vehicles according to the first aspect of the present invention, the bridge is pivotally connected to a bridge body having a hook at one end and a rear end of the bridge body so as to be vertically rotatable. Even when the grounding surface is inclined due to the fact that it is commonly used for trailers and trucks with different loading heights and that the grounding surface is uneven due to its Can be stably grounded to the ground over its entire length, thus avoiding the danger of the vehicle stepping on the rear end of the bridge and jumping up the front end of the bridge, especially during loading of the vehicle. It is possible to prevent the bridge main body from falling off, thereby making it possible to improve work safety.

Further, since the grounding member can be grounded to the ground over the entire area in the longitudinal direction as described above,
When the bridge is a support beam at both ends, the load fulcrum on the rear end side of the bridge can be located as far as possible in front of the bridge, thereby shortening the span between the load fulcrums at both ends, which is advantageous in terms of strength, The bridge can be reduced in weight.

According to the second aspect of the present invention, by mounting a non-slip protective cover member on the upper surface of each of the bridge body and the grounding member, the vehicle can be prevented from slipping when the vehicle is loaded and unloaded, thereby improving safety in use. In addition to securing the bridge body and the ground member, wear and breakage of the bridge body and the grounding member can be prevented as much as possible, and the service life can be extended.

According to the third aspect of the present invention, the bridge body and the grounding member are formed of a rectangular tubular member having a rectangular cross section and a hollow inside, so that the weight of the bridge can be further reduced.

According to a fourth aspect of the present invention, ridges are formed at both ends in the width direction of the upper flat surface of the rectangular tubular member, and the ridges are held by the ridges and have a thickness greater than those of the ridges. By installing a thick non-slip protective cover member, it is possible to prevent the non-slip protective cover member from falling off when loading and unloading the vehicle, and to use the cover member to directly rub the running part of the vehicle against the bridge body and the grounding member. Therefore, the bridge body and the grounding member can be reliably protected.

[Brief description of the drawings]

1 (A) and 1 (B) are a plan view and a side view showing a state where a vehicle loading / unloading bridge according to the present invention is mounted on a bed of a trailer.

FIG. 2 is a side view showing a use state of the bridge of FIG. 1;

FIG. 3A is a plan view of the bridge shown in FIG. 1,
(B) is a side view, (C) is a plan view in an exploded state,
(D) is an enlarged sectional view taken along line XX of (B), and (E) is (B).
5 is an enlarged sectional view taken along line YY of FIG.

FIG. 4 illustrates another structure of the pivot connection portion.
(A) is an exploded perspective view, and (B) and (C) are sectional views, respectively.

[Explanation of symbols]

 R Trailer carrier 1 Bridge 2 Carrier hook receiver 3 Hook 4 Bridge body 5 Grounding member 6 Pivot joint 7,8 Non-slip protective cover member 9,10 Square tubular member

Claims (4)

[Claims] 1. A bridge body having a hook at a front end hooked to a hook receiver provided on a trailer or a truck side, and a side view pivotally connected to a rear end of the bridge body so as to be vertically rotatable. A bridge for loading and unloading vehicles, comprising a substantially triangular ground member. 2. The vehicle loading / unloading bridge according to claim 1, wherein a non-slip protective cover member is mounted on upper surfaces of the bridge body and the grounding member, respectively. 3. The vehicle loading / unloading bridge according to claim 1, wherein the bridge body and the grounding member are formed by a rectangular tubular member having a rectangular cross section and a hollow inside. 4. An anti-slip / protective cover member which is formed at both ends in the width direction of the upper flat surface of the rectangular tubular member and is thicker than the ridges and is held by both ridges. 4. The vehicle loading / unloading bridge according to claim 2, wherein the vehicle loading / unloading bridge is mounted.