JP5833377B2 - Method for manufacturing vehicle bridge - Google Patents

Description

The present invention relates to a method for manufacturing a vehicular bridge used when loading a loaded vehicle such as a rice transplanter, a combiner, or a management machine on a loading platform of a vehicle such as a truck.

  Conventionally, this type of bridge is disclosed in Patent Document 1, for example. This bridge is a pair of left and right elongated frame members that are arranged in parallel and fixed at one end, and is fixed by welding with a predetermined gap between the frame members. And a plurality of substantially plate-like step members. In addition, the bridge is made of an extruded product of aluminum or an aluminum alloy for weight reduction, and the step material has both end portions in the running direction of the running surface to ensure its strength. Etc., ribs are erected on the back side, and the ribs are fixed to the frame material by welding.

  Then, the locking pieces of the two bridges are respectively locked to the rear end of the truck bed such as a light truck, and the other end of each bridge is placed on the ground. The two bridges are attached to the truck in an inclined state, and the vehicle is loaded onto the loading platform as the loaded wheels run on the running surface of the step material of each bridge. ing.

JP 2004-224248 A

  However, in such a bridge, the ribs on the back side of the both ends in the running direction of the step material are merely erected vertically with respect to the running surface. If both ends of the side do not come into contact with the ground due to unevenness of the ground, or if the distance between the pair of bridges is inappropriate and the wheels of the loaded vehicles do not travel the center of each bridge, etc. A weight may be applied to each bridge as a partial weight. In such a case, the entire bridge may be deformed due to the torsional force acting on the long bridge.To prevent this deformation, for example, the frame material is thickened. In such a case, the weight of the bridge itself becomes heavy, so that it is inconvenient and easy to increase in cost, and the improvement is desired.

The present invention has been made in view of such circumstances, and its purpose is to increase the connection strength between the step material and the frame material without increasing the thickness of the frame material, and to improve the load resistance against uneven load. An object of the present invention is to provide a method for manufacturing a vehicular bridge capable of preventing deformation and the like.

In order to achieve this object, the invention according to claim 1 of the present invention is such that a protrusion is integrally formed on the outer surface of the inner wall of the main body having a rectangular cross section by extrusion molding of aluminum, and in the inner space of the main body. A pair of left and right elongate frame members, which are integrally formed with ribs between the outer wall and the inner wall corresponding to the ridges, are formed by extrusion molding of aluminum, and both ends in the width direction thereof are the pair of A plurality of substantially plate-shaped step members having a traveling surface on which wheels of the loaded vehicle travel and are fixed to the inner wall of the frame member, and the loaded vehicle fixed to one end portion in the longitudinal direction of the frame member. there a method for producing a vehicular bridge with a lockable locking piece in the carrier of the vehicle to be unloading, said step material is in an inclined state toward the backside outward at both ends of the traveling direction Ribs A plurality of flat step members formed in a body and arranged at predetermined intervals, and ribs integrally formed at one end in the traveling direction with a predetermined angle toward the back surface outward direction; It consists of two end step materials arranged at a predetermined interval, and a return portion having the same length as the protruding dimension of the rib is formed integrally with the leading end portion of the rib of the step material in parallel with the running surface. In the state where both end portions in the width direction of each step material are placed on the upper surface of the ridge of the frame material, the portion excluding the inclined rib on the running surface side of each step material is entirely on the inner wall of the frame material The welded and inclined rib portion is spot-welded to the inner wall of the frame material from the back side.

According to the first aspect of the present invention , ribs are integrally formed at the running direction end of the running surface of the step material in an inclined state toward the outer side of the back surface, and both end portions in the width direction of the rib are frame materials. Since it is fixed to the inner wall surface of each frame by welding, etc., the contact area between the rib and the frame material can be increased, and the connection strength between the step material and the frame material can be increased without increasing the thickness of the frame material. It is possible to increase the load resistance of the entire bridge and prevent its deformation.

In addition, since the step material is made of a flat step material or an end step material in which ribs are integrally formed at both ends or one end in the running direction, the step material has a flat running surface provided at an intermediate portion of the bridge. Alternatively, it can also be applied to an end step material provided on the longitudinal end of the bridge and having a running surface made of an inclined surface, and the load resistance of the entire bridge can be further enhanced.

Further, the tip portion of the ribs, since the return portion of the running surface parallel to the said rib protruding dimension substantially the same length of is integrally formed, it is to increase the strength of the rib itself by the barbs, the frame The contact area with the material can be further increased, and the load resistance of the entire bridge can be further enhanced.

The top view which shows one Embodiment of the bridge for vehicles concerning this invention Arrow view taken along line AA in FIG. Plan view of the flat step material Sectional drawing along the BB line of FIG. Cross-sectional view of the same end step material The figure which shows the modification of the rib Enlarged view of the upper end of the bridge Enlarged view of the lower end of the bridge Arrow view along line CC in FIG. Perspective view of the frame material The perspective view which shows the attachment state to the track

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 11 show an embodiment of a vehicle bridge according to the present invention. As shown in FIGS. 1 and 2, a vehicle bridge 1 (hereinafter referred to as a bridge 1) includes a pair of left and right frame members 2 arranged in parallel, and a plurality of steps welded and fixed between the frame members 2. A material 3 and a pair of locking pieces 4 and the like that are welded and fixed to an upper end 2a that is one end of each frame material 2 are provided.

  The frame material 2 is formed in a long shape having a length of about 180 cm, for example, by extrusion molding of aluminum or an aluminum alloy. As shown in FIGS. 9 and 10, the frame material 2 has a main body portion 5 whose cross-sectional shape is a vertically long and substantially rectangular shape, and a design-like groove portion 6 above and below the outer wall 5 a of the main body portion 5. Are formed integrally, and between the upper and lower groove portions 6, a flat surface portion 7 to which a label such as a product name can be attached is formed.

  Further, at a predetermined position in the height direction on the outer surface of the inner wall 5b of the main body 5 (the inner surface of the frame material 2), a protrusion 8 protruding integrally by a predetermined dimension on the outer side (opposite surfaces of the pair of frame materials 2) is integrally formed. Has been. The step material 3 and the frame material 2 are welded in a state where the end portion in the width direction of the step material 3 is placed on the upper surface of the protrusion 8, whereby each step material is interposed between the pair of frame materials 2. Both ends of 3 are fixed.

Furthermore, in the internal space of the main body part 5 of the frame material 2, between the outer wall 5 a and the inner wall 5 b substantially corresponding to the protrusion 8, the rigidity such as the bending strength of the main body part 5 (frame material 2) is increased. Ribs 5c are integrally formed. Further, a step 9 is provided along the longitudinal direction on the inner surface of the inner wall 5b of the frame material 5, and the thickness of the inner wall 5b is set thin by this step 9, thereby reducing the weight and cost of the frame material 5. It is supposed to be. It should be noted that the upper wall portion and the lower wall portion which are both ends of the outer wall 5a and the inner wall 5b of the frame material 5 are formed to have a large plate thickness so that a predetermined strength is secured to the frame material 5.

  Similar to the frame material 2, the step material 3 is formed by extrusion molding of aluminum or aluminum alloy, and as shown in FIGS. 1 and 2, a plurality of flat step materials 3a and a pair of end step materials 3b. It consists of and. The flat step material 3a is welded and fixed to a portion of the pair of frame members 2 excluding both ends in the longitudinal direction with a predetermined gap 21, and a flat running surface 10 is formed on the surface thereof. Further, as shown in FIGS. 3 and 4, the flat step member 3 a protrudes by a predetermined dimension (for example, about 4 mm) on the surface side at both ends and the center of the traveling direction (a longitudinal direction of the bridge 1) of the traveling surface 10. The anti-slip ridges 12 are integrally formed, and ribs 13 and 14 are integrally formed on both ends of the running surface 10 and the back side of the central portion.

  Of these ribs 13 and 14, the ribs 13 erected on the back surfaces of both end portions of the traveling surface 10 are inclined toward the traveling surface 10 by a predetermined angle α and outside the traveling direction A (outside the traveling surface 10). An inclined portion 13a that is erected in the state and a return portion 13b that is integrally formed in parallel with the traveling surface 10 toward the inner side (the traveling surface 10 side) at the tip of the inclined portion 13a. At this time, the length of the return portion 13b is set to be approximately the same as the protruding dimension L of the inclined portion 13a with respect to the running surface 10, and the inclination angle α of the inclined portion 13a is 30 degrees to 70 degrees (preferably 55 degrees). Degree).

  The rib 14 includes a vertical portion 14a erected in a vertical state on the center back surface side of the traveling surface 10, and a return portion 14b integrally formed in parallel with the traveling surface 10 on both ends of the vertical portion 14a. It consists of A plurality of slip stoppers 15 bulging upward in a triangular shape are integrally formed at predetermined positions on the traveling surface 10 of the flat step member 3a (and the traveling surface 11 of the end step member 3b described later). ing.

  On the other hand, as shown in FIG. 5, the pair of end step members 3b are formed with a running surface 11 having a flat surface 11a and an inclined surface 11b, and bridges are formed on the running surfaces 11 of the end step materials 3b. Each of the labels 17 indicating the directionality of 1 is affixed. In addition, on one rear surface side of the end surface of the end step member 3b in the travel direction 11 of the travel surface 11, a rib 18 composed of an inclined portion 18a and a return portion 18b similar to the rib 13 of the flat step member 3a is provided. It is integrally formed in an inclined state toward the outer side. In addition, an anti-slip ridge 19 similar to the anti-slip ridge 12 is integrally formed on the surface side of the running surface 11 of the end step member 3b, and at a predetermined position on the back side of the running surface 11. The ribs 20 in a vertical state are integrally formed on the flat surface 11a.

  The flat step material 3a and the end step material 3b are fixed to the frame material 2 by welding as follows. That is, as shown in FIG. 9, both end portions of the step members 3 a and 3 b in the width direction (a direction orthogonal to the longitudinal direction A) are placed on the protrusions 8 of the inner walls 5 b of the pair of frame members 2, The side surfaces (inner side surfaces) in the width direction of the step members 3 a and 3 b are brought into contact with the inner surface of the inner wall 5 b of the frame member 2. At this time, the end surfaces of the ribs 13, 14, 18 and 20 provided on the back surfaces of the running surfaces 10 and 11 of the step materials 3a and 3b are in contact with the inner wall 5b of the frame material 2, respectively. The ribs 13 and 18 integrally formed at both ends and one end of the end step member 3b are in contact with the inclined portions 13a and 18a and the return portions 13b and 18b to the inner wall 5b of the frame member 2, respectively.

  The contact area between each step member 3a, 3b and each frame member 2 is set large by the contact of the ribs 13, 14, 18, 20 and in this state, both end portions in the width direction of each step member 3a, 3b and the frame member 2 are set. By welding a predetermined portion of the inner wall 5b, the step members 3a and 3b are welded and fixed to the respective frame members 2 with a predetermined gap 21, whereby the bridge 1 is manufactured. In addition, as a welding site | part of each step material 3a, 3b and the frame material 2, for example, the whole surface except the inclined ribs 13 and 18 by the side of the running surfaces 10 and 11 is welded, and the ribs 13 and 18 and other ribs 14 are carried out. , 20 parts are spot welded on the back side.

  As shown in FIG. 7, the locking piece 4 is formed by extrusion or the like of aluminum or aluminum alloy, and has a fixed portion 4a having an L shape in side view and a protrusion formed below the tip of the fixed portion 4a. It has a stop 4b. Then, the thickness (width) of each locking piece 4 is set to be substantially the same as the width of the main body portion 5 of each frame material 2, and each locking piece 4 is welded to the opening of the upper end portion 2 a of each frame material 2. By being fixed, the opening is closed, and each locking portion 4b protrudes from the back surface side of each frame member 2 by a predetermined dimension. As shown in FIG. 8, grounding pieces 16 having the same material and shape as the fixing portions 4 a of the locking pieces 4 are welded and fixed to the openings of the lower end portions 2 b of the frame members 2, respectively. Thus, the opening of the lower end 2b of each frame member 2 is closed.

  Next, an example of how to use the bridge 1 configured as described above will be described. First, when loading a loaded vehicle having opposed wheels, caterpillars, etc., such as rice transplanters and combines, on the loading platform 24 of a truck 23 such as a light truck shown in FIG. prepare. And while visually confirming the direction of the arrow of the label 17 affixed to the end step material 3b of one bridge 1, the end on the side facing the arrow, that is, the upper end of the bridge 1 is lifted, The locking portions 4b of the locking pieces 4 of the bridge 1 are inserted from above into the gap between the tilted cage 25 provided at the rear end of the loading platform 24 of the truck 23 and the vehicle body.

  As a result, the pair of locking pieces 4 of one bridge 1 is locked at a predetermined position of the loading platform 24 of the track 23. At this time, the grounding piece 16 contacts the ground at the lower end of the bridge 1, and the bridge 1 Is attached to the loading platform 24 in an orthogonal state. Once one bridge 1 is locked to the loading platform 24 and attached, the locking piece 4 of the other bridge 1 is then locked to the loading platform 24 in the same manner. At this time, the other bridge 1 is engaged with the loading platform 24 so that the interval W between the bridge 1 already attached and the second bridge 1 to be attached next substantially matches the wheel interval of the loaded vehicle. Stop. When the two bridges 1 are attached to the loading platform 24, the distance W between the two bridges 1 is confirmed or adjusted, the loaded vehicle is driven in this state, and the wheels of the vehicles are moved to step 3 of the two bridges 1. It is moved (running) above and loaded onto the loading platform 24.

  When the loaded vehicle is transported to the work site and lowered from the loading platform 24, the two bridges 1 removed from the loading platform 24 are loaded in the loading platform 24 of the truck 23 in the same manner as when loading the loaded vehicle. It can be done by reattaching to and using the bridge 1. Even when a partial load is applied to each bridge 1 when the loaded vehicle is loaded onto the loading platform 24, the step materials 3a and 3b and the frame material 2 are welded and fixed in contact with each other with a larger contact area than before. Therefore, the strength of the bridge 1 itself is increased, and deformation such as twisting is prevented.

  As described above, according to the bridge 1, the end faces of the travel surfaces 10 and 11 of the step materials 3 made of the flat step material 3 a and the end step material 3 b are inclined toward the back surface outward direction. The ribs 13 and 18 are integrally formed, and both end portions in the width direction of the ribs 13 and 18 are fixed to the inner wall 5b inner surface of each frame material 2 in contact with each other by welding, so that each step material 3a, The contact area between the ribs 13 and 18 of the frame 3b and the frame material 2 can be increased. For example, the conventional frame material is used as it is without making the frame material 2 thick, and the step materials 3a and 3b and the frame material 2 are connected. The strength can be increased and the load resistance of the entire long bridge 1 can be increased.

  As a result, the grounding pieces 16 of the pair of bridges 1 are floating from the ground due to the inclination or unevenness of the grounding surfaces, or the installation interval W of the pair of bridges 1 is inappropriate, and the weight of the loaded vehicle is increased. Even when a partial load is applied to each bridge 1 by adding to the end of the bridge 1 in the width direction, the bridge 1 can sufficiently withstand such a load, and the bridge 1 itself can be deformed. Can be used stably over a long period of time.

  Further, the rib 13 having the inclined portion 13a is integrally formed at both ends of the flat step member 3a in the traveling direction (a), and the rib 18 having the inclined portion 18a is integrally formed at one end portion of the end step member 3b. Therefore, the strength of the step materials 3a and 3b used for the bridge 1 with respect to the frame material 2 can be further increased, and deformation of the entire bridge 1 and the like can be reliably prevented. Further, return portions 13b and 18b that are parallel to the running surfaces 10 and 11 and have substantially the same length as the protruding dimension L of the ribs 13 and 18 are integrally formed at the tip ends of the ribs 13 and 18 of the step members 3a and 3b. Therefore, the strength of the ribs 13 and 18 themselves can be increased by the return portions 13b and 18b, and the contact area with the frame material 2 can be further increased, and the load resistance of the bridge 1 as a whole can be further increased. It can be further increased to prevent the deformation more reliably.

  Furthermore, since it is not necessary to increase the thickness of the frame material 2 as in the prior art in order to increase the strength of the bridge 1, it is possible to provide an inexpensive bridge 1 while suppressing an increase in the cost of the frame material 2. By reducing the weight of the frame material 2 and the like, the bridge 1 itself can be reduced in weight, and the bridge 1 having excellent usability can be provided.

  In addition, in the said embodiment, although the ribs 13 and 18 provided in the edge part back surface of each step material 3a and 3b were set as the structure which has inclined part 13a, 18a and return part 13b, 18b, this invention is this. For example, as shown in FIG. 6, a vertical portion 13c (or arc portion) having a predetermined size and a predetermined shape may be provided between the inclined portion 13a and the return portion 13b. An appropriate structure that has an inclined portion and can increase the contact area with the frame material 2 can be employed.

Moreover, in the said embodiment, although the rib 13 which has the inclination part 13a and the return part 13b was each integrally formed in the back surface of the both ends of the running direction (a) of the flat step material 3a, like the end step material 3b, It is good also as a structure which provides the rib 13 only in an edge part. Further, in the embodiment, the shape of the flat step material 3a and the end step material 3b, the shape of the locking piece 4 and the grounding piece 16, the overall shape of the bridge 1, the presence or absence of the label 17, the frame material 2 and the step material 3 The welded portion is an example, and for example, a pair of locking pieces 4 and grounding pieces 16 fixed to the end of each frame material 2 are integrated, or the label 17 is omitted . Appropriate configurations can be employed without departing from the scope of the invention.

  The present invention is not limited to a bridge used when loading a loaded vehicle such as an agricultural machine on a loading platform of a truck such as a light truck. For example, a loaded vehicle such as a mountain bike is mounted on a loading platform of a vehicle such as a wagon vehicle. It can also be used for bridges used for picking down.

1 .... Vehicle bridge 2 .... Frame material 3 .... Step material 3a ... Flat step material 3b ... End Step material 4 ··· Locking piece 5 ··· Body 5a · · · Outer wall 5b · · · Inner wall 5c · · · Rib 10, 11 ... Running surface 11a ... Flat surface 11b ... Inclined surface 12, 19 ... Non-slip protrusion 13 ... Rib 13a ... Inclined portion 13b ... ... Return part 14 ... Rib 18 ... Rib 18a ... Inclined part 18b ... Return part 20 ... Rib α ...・ ・ ・ Angle L ・ ・ ・ ・ ・ ・ ・ ・ ・ Projection dimension ・ ・ ・ ・ ・ ・ ・ ・ Running direction

Claims (1)

A protrusion is integrally formed on the outer surface of the inner wall of the main body having a rectangular cross section by extrusion molding of aluminum, and a rib is integrally formed between the outer wall and the inner wall corresponding to the protrusion in the inner space of the main body in parallel. A pair of left and right elongated frame members to be disposed, and a traveling surface formed by extrusion molding of aluminum and having both ends in the width direction welded and fixed to the inner walls of the pair of frame members, on which the wheels of the loaded vehicle travel. includes a plurality substantially plate-shaped step member of, and a lockable locking piece in the carrier vehicle longitudinal are respectively fixed to one end portion the object to be loaded vehicle is unloading of the frame member having A method of manufacturing a vehicle bridge ,
The step material includes a plurality of flat step materials in which ribs are integrally formed at both end portions in the traveling direction in an inclined state toward the outer side of the back surface and arranged at predetermined intervals, and one end portion in the traveling direction. Ribs are integrally formed in a tilted state at a predetermined angle toward the back outer side direction, and the flat step material and two end step materials arranged at a predetermined interval,
A return portion that is parallel to the running surface and has the same length as the protruding dimension of the rib is integrally formed at the tip of the rib of the step material, and both widthwise end portions of the step material are protrusions of the frame material. In a state of being placed on the upper surface, a portion of each step member excluding the inclined rib on the running surface side is entirely welded to the inner wall of the frame member, and the inclined rib portion is connected to the frame from the back side. A method for manufacturing a vehicular bridge , characterized by being spot-welded to an inner wall of a material.

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