JP6516368B2 - Dolly - Google Patents

Description

  The present invention relates to a truck for carrying a load.

  There are various types of carts for carrying a load. Since the conventional bogie frame is made of metal such as iron and steel, it is excellent in load resistance and strength, but has the drawback of being heavy. The truck not only loads and transports the luggage, but also the worker may carry it empty, so carrying it was difficult if it was heavy. Recently, there is also one in which the carriage frame is made of aluminum for weight reduction, but since it is made of aluminum, there are problems in terms of load resistance and strength.

  Conventionally, there is also a carriage frame in which four corner members are connected by a frame member and made rectangular (Patent Document 1). This is intended to reduce the weight by making the corner members of the frame made of aluminum.

JP, 2010-159054, A

  The problem to be solved by the present invention is to provide a truck that is lightweight and has excellent strength and load resistance.

The carriage of the present invention is a carriage provided with wheels (including casters) under a rectangular carriage frame, and the carriage frame is assembled in a square by connecting four frame members to four corner members. Each of the corner members is provided with a connecting portion which protrudes in two directions at right angles or approximately right angles. The connecting portion is provided with at least two opposing plate members at intervals, and the frame member is provided with at least two opposing side walls at intervals. The frame member and the connecting portion are engaged such that one side wall and one plate material are superposed on the inside and the outside, and the other side wall and the other plate member are superposed on the outside and the inside. The frame member and the connection part which are fitted are one of the overlapping plate material and the side wall, and the other overlapping plate material and the bolt inserted to the outside of the side wall are overlapping each other or / And a screw hole formed in the other plate or side wall by screwing and connected, and by connecting a nut to the tip of the bolt projecting outside the other plate or side wall by tightening, It is connected to.

  In the present invention, it is also possible to do double connection without using the nut. In this case, a bolt is inserted from the outside of one polymerizing plate and the side wall to the outside of the other polymerizing plate and the side wall, and the bolt is formed on the polymerizing one plate or / and the side wall Formed in the outer plate material or side wall of the other plate material or side wall which is screwed into the screw hole being inserted and which connects the frame member and the fitting part which are fitted and which is superposed on the tip end side of the bolt It is also connected and doubly connected by screwing into the threaded holes.

  The screw hole may be a tapping screw in which a screw is formed on an inner peripheral surface of a through hole opened in a side plate of a plate member of a corner member or a frame member, or a burring screw in which a lower hole is burred. . It is also possible to attach a nut to the inner surface of the plate material having an open through hole and use a screw hole of the nut.

  In the carriage of the present invention, the bottom surface of the frame member polymerized as described above and the bottom surface of the connecting portion of the corner member can also be connected with a bolt. The corner member may be provided with a tubular pipe support portion into which the pipe can be inserted longitudinally, and the connection portion may be welded and fixed to the pipe support portion and projected in two directions at right angle or substantially right angle. . The corner member is preferably made of a metal material, and the frame member is preferably made of a lightweight material such as aluminum or reinforced FRP.

The trolley of the present invention has the following effects.
(1) The connection between the fitted corner member and the frame member is a double connection of screwing of a bolt into a screw hole and connection by screwing a nut to the bolt, or a fitted corner The double screwing of the bolt into the connecting portion of the member and the screw hole of the frame member strengthens the connection.
(2) Since the corner members are provided with connecting portions projecting in two directions at right angles or approximately right angles, the frame members are fitted to the connecting portions and assembled by merely connecting the bolt members with bolts. Can be easily assembled.
(3) If the bottom surface of the connecting portion of the corner member and the bottom surface of the frame member are also connected, the connection between the connecting portion and the frame member becomes stronger.
(4) If the corner member has a tubular pipe support portion into which the pipe can be inserted in the vertical direction, the pipe is inserted in the pipe support portion in the vertical direction and used as a handle of the truck or luggage loaded on the truck It can be used as a support to prevent the collapse of the
(5) If the corner member is made of a metal material and the frame member is made of a lightweight material, the load resistance and the strength are excellent and the weight is reduced.

The perspective view which shows an example of the trolley | bogie of this invention. The disassembled perspective view of the corner member and frame member of the trolley | bogie of this invention. The assembly perspective view of the corner member and frame member of the trolley | bogie of this invention. (A) is sectional drawing of the connection structure of the corner material part of FIG. 3 and the side wall of a flame | frame member, (b) is sectional drawing of the connection structure of the corner member of FIG. 3 and the baseplate of a flame | frame member. The top view of the corner member of the trolley | bogie of this invention. It is another example of the corner member of the trolley | bogie of this invention, Comprising: The top view at the time of making a pipe support part into a square pipe. It is another example of the corner member of the trolley | bogie of this invention, Comprising: The top view at the time of butting and welding two fitting protrusions at right angles, without a pipe support part. (A)-(c) is sectional drawing of a different example in the case of connecting the connection part and frame member of the corner member of the trolley | bogie of this invention with a volt | bolt and a nut. (A) and (b) are sectional drawings of a different example in the case of connecting the connection part and frame member of the corner member of the trolley | bogie of this invention with a volt | bolt and a nut. (A)-(c) is sectional drawing in the case of doubly connecting the connection part and frame member of the corner member of the trolley | bogie of this invention only with a volt | bolt. (A) and (b) are cross-sectional views in the case of inserting and connecting the connection part and the frame member of the corner member of the trolley | bogie of this invention in the screw hole by which burring was carried out. The disassembled explanatory drawing in the case of inserting and connecting the connection part and frame member of the corner member of the trolley | bogie of this invention in the screw hole which attached the nut. Assembly explanatory drawing in the case of inserting and connecting the connection part and frame member of the corner member of the trolley | bogie of this invention in the screw hole which attached the nut. (A) is sectional drawing of the connection structure of the board material of the corner member of FIG. 13 and the side wall of a frame member, (b) is sectional drawing of the connection structure of the corner member of FIG. 13 and the baseplate of a frame member.

(Embodiment 1)
[Car]
An example of the trolley | bogie of this invention is demonstrated based on drawing. The carriage shown in FIG. 1 as an example is a carriage provided with wheels 2 under a rectangular frame 1. The frame 1 is formed in a rectangular shape by four corner members 3 and four frame members 4 disposed and fixed between the corner members 3. A of FIG. 1 is a crosspiece and B is a floor plate stuck on crosspiece A. As shown in FIG.

[Corner member]
The corner member 3 is provided with a vertically long cylindrical pipe support 6 (FIG. 2) and a connecting portion 5 (FIG. 3) which protrudes at right angles or substantially right angles on both sides of the pipe support 6.

[Pipe support]
As shown in FIGS. 2 and 5, in the pipe support portion 6, the support member 9 having a substantially V shape in plan view is abutted against the inside of the curved portion of the plate 8 which is curved substantially at a right angle in plan view. Both end surfaces of 9 are welded and fixed to the plate 8 to form a vertically oriented cylindrical shape with an upper opening. A bottom plate 10 is provided on the bottom surface of the pipe support 6 so as to support the pipe 11 (FIG. 1) inserted in the vertical direction from the top opening of the pipe support 6.

[Connected section]
The connection part 5 (FIG. 3) is comprised by the board | plate material 8 and the fitting protrusion 7 of the side view "-" character shape weld-fixed on the inner side. One longitudinal end face 13 (FIG. 2) of the fitting projection 7 abuts against both side surfaces of the support member 9 and is fixed by welding. In this case, a gap 15 (FIG. 3, FIG. 5) is provided between the inner surface of the plate member 8 and the fitting projection 7, and the outer side wall 24a (FIG. 3) of the rectangular tubular frame member 4 is formed in the gap 15. It is made to be able to insert.

  Four through holes 18 are opened in the plate member 17 (FIG. 2) at the back of the side-viewed “U” -shaped fitting protrusion 7. The through holes 18 are opened coaxially with the four through holes 19 of the plate 8. The through hole 18 of the plate member 17 at the back is a screw hole whose inner peripheral surface is threaded. The screw hole 18 is a screw hole into which the bolt 30 (FIG. 3) can be screwed. The screw hole 18 is a screw hole (tapping screw hole: Fig. 4 (a)) screwed with a tapping tool on the inner peripheral surface of the through hole drilled in the plate material 17, and the plate material 17 is drilled by drilling a lower hole. A screw hole screwed on the inner peripheral surface (burring screw hole: Fig. 11 (a)) or a screw hole inserted in a nut or screw in the through hole and fixed in the through hole by means such as welding or caulking It may be a screw hole screwed by another processing method.

  One screw hole 22 is opened in the bottom plate 21 (FIG. 2) of the fitting protrusion 7. The screw hole 22 is a screw hole into which the bolt 34 (FIG. 3) can be screwed. This screw hole 22 is also formed by tapping a tapping screw hole (FIG. 4 (b)) screwed with a tapping tool on the inner peripheral surface of the through hole formed in the bottom plate 21 and a burring hole in the bottom plate 21 Screw holes screwed into the circumferential surface, screw holes inserted into the through holes by nuts or screws and fixed in the through holes by welding or caulking, etc. Screw holes screwed by other processing methods It may be In some cases, a nut or other screw type fastener may be fixed by welding to the outside or inside of the through hole, or may be fixed by other means.

[Frame member]
The frame member 4 is a rectangular tube made of aluminum. Through holes 25a, 25b are opened at four locations on the opposing side walls 24a, 24b (FIG. 2) of the frame member 4. One through hole 27 is opened in the bottom plate 26 (FIG. 3) of the frame member 4.

[Attachment of frame members to corner members]
In order to attach the frame member 4 to the connecting portion 5 (FIG. 3) of the corner member 3, the rectangular tubular frame member 4 is fitted on the connecting portion 5 and fitted. In this case, as shown in FIG. 5, one side wall 24a of the frame member 4 is inserted into the gap 15 between the plate 8 and the fitting projection 7, and the one side wall 24a and the plate 8 of the corner member 3 are superposed. The side wall 24b of the second embodiment and the plate member 17 of the fitting protrusion 7 are polymerized. Thereafter, as shown in FIG. 3, the bolts 30 are inserted from the four through holes 19 of the plate member 8 on the insertion side into the four through holes 25 a in front of the frame member 4 overlapping with the plate member 8. The end portion 31 (FIG. 4A) is screwed into the screw hole 18 of the fitting projection 7 to connect the overlapping side wall 24b and the plate member 8.

  Further, as shown in FIG. 4A, the tip end side of the bolt 30 is projected from the screw hole 18 to the outside of the side wall 24b on the projecting side of the frame member 4. A washer 32 is placed on the end portion 31 of the bolt 30 from the outside of the side wall 24b, and a nut 33 is screwed to tighten the screwing of the bolt 30 and the nut 33. The frame member 4 is connected and fixed to the connecting portion 5 of the corner member 3 by the double tightening of the tightening and the screwing of the bolt 30 into the screw hole 18.

  Further, as shown in FIG. 4 (b), a bolt 34 (FIG. 4 (b)) having a washer 35 inserted from the outside of the bottom plate 26 of the frame member 4 is inserted. The frame member 4 can also be fixed to the bottom plate 21 of the fitting protrusion 7 by screwing into the screw. By fixing the bottom plate 21 and fixing the screw 30 to the screw hole 18 by screwing, the five places of the frame member 4 are fixed to the connecting portion 5 of the corner member 3.

  The round pipe 11 of FIG. 1 can be used as a handle at the time of carriage movement, and can be used for positioning of luggage stacked on the carriage, and also for preventing load collapse. The wheel 2 in FIG. 1 can be the same as or different from the wheel used in the existing truck.

Second Embodiment
The truck corner member in the present application can also be configured as shown in FIG. In FIG. 6, a rectangular bar is used vertically as the pipe support 6, and the end of the plate 8 is welded and fixed to the two side surfaces of the rectangular bar, and the U-shaped fitting projections 7 are butted and welded. As the connecting portion 5. In this embodiment, as in FIG. 3, the outer periphery of each fitting protrusion 7 is covered with the rectangular tubular frame member 4 and the bolt 30 is inserted through the through plate or screw hole 19 of one plate 8-frame member The tip end portion 31 of the bolt 30 is projected from the other end of the frame member 4 by inserting in order the through hole of the side wall 24a of 1 4 or the screw hole 25a-the through hole of the other plate member 17 (fitting projection 7) or screw hole 18 The washer 32 is made to protrude to the outside of the through hole or screw hole 25b of the side wall 24b of the side, the washer 32 is put on the tip 31 thereof, the nut 33 is screwed and the bolt 30 and the nut 33 are tightened. The part 5) and the frame member 4 can be connected. Further, as shown in FIG. 4B, the bolt 34 with the washer 35 inserted from the outside of the bottom plate 26 of the frame member 4 is inserted and screwed into the screw hole 22 provided in the bottom plate 21 of the fitting projection 7 The member 4 and the bottom plate 21 of the fitting protrusion 7 can also be fixed.

(Embodiment 3)
The corner member in the present application can also be configured as shown in FIG. In FIG. 7, the pipe support portion 6 shown in FIG. 2 is not provided, and "" shaped fitting projections 7a and 7b are prepared as in the case of FIG. Alternatively, the other fitting projection 7b may be butted against the side surface of the fitting projection 7a for welding. In this case, the rectangular tubular frame member 4 is placed on the outer periphery of each of the fitting projections 7a and 7b, and the through holes or screw holes 19 of the plate member 8 on one insertion side are screwed in the same manner as in FIG. The tip end 31 of the bolt 30 is inserted into the through hole of the side wall 24 a of the frame member 4 or the through hole or screw hole 18 of the screw hole 25 a−the plate member 17 (fitting projection 7) of the other To the outside of the through hole or screw hole 25b of the side wall 24b on the projection side, place the washer 32 on the tip 31 of the bolt 30, screw the nut 33 and tighten the bolt 30 and nut 33 The frame member 4 can be coupled to the joint projections 7a and 7b. Further, as shown in FIG. 4B, a bolt 34 with a washer 35 inserted from the outside of the bottom plate 26 of the frame member 4 is inserted and screwed into a screw hole 22 provided in the bottom plate 21 of the fitting projections 7a and 7b. The frame member 4 and the bottom plate 21 of the fitting protrusion 7 can also be fixed.

(Embodiment 4)
The connection structure of the connection portion 5 of the corner member 3 and the frame member 4 in the present application may be as shown in FIGS. 8 (a) to 8 (c). 8 (a) shows a connecting portion 5 having a plate member 8 and a "" shaped fitting projection 7 in a longitudinal sectional view, a frame member 4 having a rectangular shape in a longitudinal sectional view, a bolt 30, and a nut It is a case where it connects using 32. In FIG. 8A, only one bolt 30 is shown.

  In FIG. 8 (a), the bolt 30 is inserted from the outside of the plate member 8 on one insertion side of the corner member 3 into the through hole 19 of the plate member 8 and the through hole 25a of one side wall 24a of the frame member 4 The plate member 17 is screwed into the screw hole 18 of the other plate member 17 of the corner member 3, and the plate member 17 is drawn into the side wall 24 a of the frame member 4 to connect the corner member 3 and the frame member 4. Further, the tip side 31 of the bolt 30 protruding from the screw hole 18 is inserted into the through hole 25 b of the side wall 24 b on the other side of the frame member 4 to protrude to the outside of the side wall 24 b. The side wall 24b of the frame member 4 and the plate member 17 of the corner member 3 are tightly installed by screwing together the nut 32 and tightening the bolt 30 and the nut 32, and the corner member 3 and the frame member 4 are connected doubly It is

Embodiment 5
Also in FIG. 8B, the connecting portion 5 having the plate member 8 and the "" shaped fitting protrusion 7 in the longitudinal sectional view, the frame member 4 having the longitudinally elongated rectangular shape in the longitudinal sectional view, the bolt 30, and the nut It is a case where it connects using 32. Specifically, the bolt 30 is inserted into the through hole 19 of the plate member 8 from the outside of the plate member 8 on one insertion side of the corner member 3 and screwed into the screw hole 25 a of the side wall 24 a of the frame member 4. The one side wall 24a of the frame member 4 is pulled toward the plate member 8 to connect the corner member 3 and the frame member 4. Furthermore, the tip end side of the bolt 30 is screwed into the screw hole 18 of the other plate member 17 (fitting protrusion 7) to draw the fitting protrusion 7 toward the side wall 24a of the frame member 4 to connect the corner member 3 and the frame member 4 . Furthermore, the tip end side of the bolt 30 is inserted into the through hole 25b of the other side wall 24b of the frame member 4 to protrude to the outside of the projecting side wall 24b, and the nut 32 is screwed on the tip end of the bolt 30 The plate member 8 and the side wall 24b are drawn close to each other by tightening the bolt 30 and the nut 32, so that the corner member 3 and the frame member 4 are connected in a triple manner.

Embodiment 6
In the case shown in FIG. 8 (c), the fitting projection 7 has a plate shape, not a "U" shape in a longitudinal sectional view, and the vertically elongated rectangular frame member 4 is fitted to the outside of the two plate members 8 and 17. As in the case of FIG. 8 (b), they are connected by bolts 30 and nuts 32.

Seventh Embodiment
In the case shown in FIG. 9 (a), the fitting projection 7 has a plate shape instead of a "U" shape in a longitudinal sectional view, and the frame member 4 having a longitudinally elongated rectangular shape in a longitudinal sectional view is fitted inside the two plate members 8 and 17. And insert the bolt 30 from the outside of the plate member 8 on one insertion side of the corner member 3 into the through hole 19 of the plate member 8 and the through hole 25a of the side wall 24a of the frame member 4; Screw in the screw hole 25b of the other side wall 24b, insert the tip end of the bolt 30 projecting from the screw hole 25b into the through hole 18 of the other plate 17 and make it project to the outside of the plate 17 on the projecting side The connecting portion 5 of the corner member 3 and the frame member 4 are connected by screwing the nut 32 to the tip end portion 31 and tightening the bolt 30 and the nut 32.

(Embodiment 8)
In the case shown in FIG. 9 (b), the fitting projection 7 has a plate-like shape instead of a "C" shape in a longitudinal sectional view as in the case of FIG. 9 (a). The member 4 is fitted, and the bolt 30 is inserted into the through hole 19 of the plate member 8 from the outside of the plate member 8 on one insertion side of the corner member 3 and screwed into the screw hole 25a of one side wall 24a of the frame member 4 The bolt 30 is screwed into the screw hole 25b of the other side wall 24b of the frame member 4, and the tip end of the bolt 30 projecting from the screw hole 25b is inserted into the through hole 18 of the other plate 17 and protrudes to the outside of the plate 17 The connection portion 5 of the corner member 3 and the frame member 4 are connected by screwing the nut 32 to the tip end portion 31 of the bolt 30 and tightening the bolt 30 and the nut 32.

(Embodiment 9)
10 (a) does not use a nut for the connecting portion 5 provided with the plate member 8 and the "" shaped fitting projection 7 in the longitudinal sectional view and the frame member 4 in the longitudinal sectional view and the vertically elongated rectangle. It is a case where only bolt 30 connects. Specifically, the bolt 30 is screwed from the outside of the plate member 8 on the insertion side into the screw hole 19 of the plate member 8 and the screw hole 25 a of one side wall 24 a of the frame member 4. The connecting portion 5 of the corner member 3 and the frame member 4 are connected by screwing them into the screw holes 25 b of the side wall 24 b of the other projecting side of the frame member 4 and the frame member 4.

(Embodiment 10)
In the case shown in FIG. 10 (b), two plate members 8 and 17 and a frame member 4 in the form of a long rectangular in vertical section view fitted with them are connected only by the bolt 30 without using a nut. It is. Specifically, the bolt 30 is inserted from the outside of the plate member 8 on the insertion side into the through hole 19 and the through hole 25 a of one side wall 24 a of the frame member 4, and the tip end of the bolt 30 is the other side of the frame member 4. The connection portion 5 of the corner member 3 and the frame member 4 are connected by screwing into the screw holes 25b of the side wall 24b and the screw holes 18 of the plate member 17 on the protruding side.

(Embodiment 11)
10 (c) does not use a nut for the connecting portion 5 provided with the plate member 8 and the "" shaped fitting protrusion 7 in the longitudinal sectional view and the frame member 4 in the longitudinal sectional view and the vertically elongated rectangle. It is a case where only bolt 30 connects. Specifically, the bolt 30 is inserted into the through hole 19 from the outside of the plate member 8 on the insertion side, and screwed into the screw hole 25 a of one side wall 24 a of the frame member 4. The connecting portion 5 of the corner member 3 and the frame member 4 are connected by screwing them into the screw holes 25b of the side wall 24b of the other projecting side of the frame member 4 and the frame member 4.

(Embodiment 12)
Figure 11 (a) to indicate to what is the same as that shown in FIG. 8 (a) in the basic structure, difference is that in which the screw hole 18 of the plate 17 to burring screw hole.

(Embodiment 13)
Figure 11 (b) to indicate to what is the same as that shown in FIG. 8 (b) in the basic structure, different from a screw hole 18 of the plate 17, the side walls of the longitudinal cross section longitudinal rectangular corner members 4 The screw hole 25a of 24a is a burring screw hole.

(Embodiment 14)
In the first to thirteenth embodiments, the screw holes 19 of the plate member 8 of the corner member 3, the screw holes 18 of the plate member 17, the screw holes 25 a and 25 b of the side walls 24 a and 24 b of the frame member 4, and the bottom plate 21 of the fitting protrusion 7. In the case of the screw holes 22 and the screw holes 27 of the bottom plate 26 of the frame member 4 are tapping screw holes formed by screwing the inner peripheral surface of the through holes penetrating the plate, side wall and bottom plate In the present invention, as shown in FIG. 12, a nut 20 is formed on the inside of the through hole 18 which is open in the plate member 17 of the fitting protrusion 7 of the corner member 3 in the present invention. Alternatively, a screw type fastener 23 may be attached to the inside of the through hole 22 opened in the inner surface of the bottom plate 21 of the fitting projection 7 to form a screw hole. Fixing by welding is suitable for attaching the nut 20 and the stopper 23.

  After the corner member 3 and the frame member 4 of FIG. 12 are fitted as shown in FIG. 13 (fitted similarly to the fitting of FIG. 3), they are connected by bolts as shown in FIGS. 14 (a) and 14 (b). be able to.

  14A, the bolt 30 is inserted from the outer side (insertion side) of the plate member 8 of the corner member 3 into the through hole 19 of the plate member 8 and the through hole 25a of the side wall 24a of the frame member 4. Is screwed into the nut 20 attached to the plate member 17 of the fitting protrusion 7 to draw the plate member 17 of the fitting protrusion 7 toward the side wall 24 a of the frame member 4 to connect the two 17 and 24 a. Furthermore, the nut 33 is screwed into the tip end portion 31 of the bolt 30 projecting to the outside (projecting side) of the side wall 24b of the frame member 4 and tightened by the nut 33. The plate 17 of the fitting projection 7 and the side wall 24b of the frame member 4 In the case of linking The corner member 3 and the frame member 4 can be doubly connected by this both connection.

  In FIG. 14 (b), the bolt 34 is from the outside (insertion side) of the bottom plate 26 of the frame member 4, the through hole 27 of the bottom plate 26 of the frame member 4 and the through hole of the bottom plate 21 of the fitting protrusion 7 of the corner member 3. 22 and screw the tip end of the bolt 34 into a screw type fastener 23 attached to the inner surface of the bottom plate 21 of the fitting protrusion 7 to connect the bottom plate 21 of the fitting protrusion 7 and the bottom plate 26 of the frame member 4 That's the case.

(Other embodiments)
The embodiment described above is merely an example of the present invention. The shape and structure of the corner member 3 and the frame member 4, the fitting of the frame member 4 to the connecting portion 5 of the corner member 3, and other shapes, structures and the like are within the scope of the present invention. It may be connected or the like.

  The connection structure of the frame member 4 and the corner member 3 of the bogie according to the present invention can be a connection structure other than the above embodiment as long as the frame member 4 and the corner member 3 can be connected to two or more.

Reference Signs List 1 frame 2 wheel 3 corner member 4 frame member 5 connection portion 6 (for corner member) connection portion 6 pipe support portion 7 fitting protrusion 7a, 7b fitting protrusion 8 plate member 9 support member 10 bottom plate 11 pipe 13 end surface of fitting protrusion 14 (fitting protrusion) inner surface 15 gap 17 (the fitting projection) sheet 18 (sheet material) (plate material) through hole or screw hole 19 through hole or screw hole 20 nut 21 (the fitting projection) the bottom plate 22 Through holes or screw holes (of the bottom plate of the fitting projections) 23 Fasteners 24a, 24b Side walls 25a, 25b (of the frame members) Through holes or screw holes 26 (of the frame members) Bottom plate 27 (of the frame members) Holes or holes in the bottom plate of the member 30 bolt 31 (at the end of the bolt) 32 washer 33 nut 34 bolt 35 washer A cross rail B bottom plate

Claims (6)

In a truck with wheels under a rectangular truck frame,
The bogie frame has four frame members squarely assembled in four corner members,
Each of the corner members is provided with a connecting portion projecting in two directions at right angles or approximately right angles,
The connecting portion includes at least two plate members facing each other at intervals.
The frame member comprises at least two opposing side walls spaced apart,
In the connecting portion of the frame member and the corner member, one side wall of the frame member and one plate of the connecting portion overlap inward and outward, and the other side wall of the frame member and the other plate of the connecting portion are inside and outside Fitted to polymerize,
The fitted frame member and the connecting portion are formed by inserting one of the overlapping plate material and the side wall from the outside, the overlapping plate material and the bolt inserted so as to protrude to the outside of the side wall. And between the overlapping plate material and the side wall on the projecting side, they are connected by being screwed into the screw holes of the inner plate material or side wall, and also connected by tightening the nut to the tip of the projecting bolt Are doubly linked,
A dolly characterized by In a truck with wheels under a rectangular truck frame,
The bogie frame has four frame members squarely assembled in four corner members,
Each of the corner members is provided with a connecting portion projecting in two directions at right angles or approximately right angles,
The connecting portion includes at least two plate members facing each other at intervals.
The frame member comprises at least two opposing side walls spaced apart,
In the connecting portion of the frame member and the corner member, one side wall of the frame member and one plate of the connecting portion overlap inward and outward, and the other side wall of the frame member and the other plate of the connecting portion are inside and outside Fitted to polymerize,
The fitted frame member and the connecting portion are formed by inserting one of the overlapping plate material and the side wall from the outside, the overlapping plate material and the bolt inserted so as to protrude to the outside of the side wall. And, of the overlapping plate material and the side wall on the projecting side, the nut is attached to the tip of the bolt which is connected by being screwed into a screw hole formed by attaching a nut to the inner plate material or side wall Are also connected by tightening and double connected,
A dolly characterized by In a truck with wheels under a rectangular truck frame,
The bogie frame has four frame members squarely assembled in four corner members,
Each of the corner members is provided with a connecting portion projecting in two directions at right angles or approximately right angles,
The connecting portion includes at least two plate members facing each other at intervals.
The frame member comprises at least two opposing side walls spaced apart,
In the connecting portion of the frame member and the corner member, one side wall of the frame member and one plate of the connecting portion overlap inward and outward, and the other side wall of the frame member and the other plate of the connecting portion are inside and outside Fitted to polymerize,
In the fitted frame member and the connecting part, the other plate overlapping the plate and the bolt inserted to the outside of the side wall from the outside of the overlapping plate and side wall are inserted or / and protruding side A side wall or plate member connected by screwing in a screw hole formed by attaching a nut to an inner plate member or side wall among plate members and a side wall, and the bolt is screwed into the plate member or side wall The tip side of the bolt is also connected by screwing into the screw hole of, and is doubly connected,
A dolly characterized by The trolley according to any one of claims 1 to 3 .
The corner member has a tubular pipe support portion into which the pipe can be inserted vertically,
The connecting portion of the corner member is provided with a plate and a fitting projection,
The fitting projection is welded and fixed to the side surface of the pipe support portion and is provided on the side of the side surface,
A gap is provided between the plate member and the fitting protrusion so that the side wall of the frame member can be inserted.
A dolly characterized by The trolley according to any one of claims 1 to 4 .
The bottom surface of the frame member and the bottom surface of the connecting portion of the corner member are connected by bolts,
A dolly characterized by The trolley according to any one of claims 1 to 5 .
The corner member is made of metal and the frame member is made of lighter material than metal,
A dolly characterized by

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