JP4552891B2 - Carriage support for transport cart - Google Patents

Description

  The present invention relates to a load supporting table for a transport carriage, in which a reinforcing steel pipe is embedded in a flat rectangular main body formed of synthetic resin in parallel with the upper surface of the main body.

For example, Patent Document 1 or the like discloses a load support for a transport carriage having the above-described configuration. In a conventional load support for a transport carriage as described in Patent Document 1, A bowl-shaped steel pipe insertion hole partially formed in the tunnel is formed in the load support base body, a reinforcing steel pipe is inserted from the open end of one end of the bowl-shaped steel pipe insertion hole, and the open end is covered with a lid. Close structure is adopted.
JP-A-10-16783

  In the structure of the conventional load support platform for a transport carriage as described above, a tunnel portion penetrating in the steel pipe insertion direction must be formed in a part of the steel pipe insertion hole, so that the long length that can be inserted into and removed from the molding die is required. There is a drawback that a medium mold is required and the molding cost is high.

  An object of the present invention is to provide a load support for a transport carriage that can solve the above-described conventional problems. The means is shown with reference numerals of embodiments to be described later. The load carrier 4 for the transport carriage is formed by embedding a reinforcing steel pipe 15 in a flat rectangular main body 24 formed of synthetic resin, and the reinforcing steel pipe 15 is a steel pipe insertion hole 25 formed in the main body 24. The steel pipe insertion hole 25 is formed between the upper open recessed portions 26B and the lower open recessed portions 27A and 27B, which are alternately arranged in the axial direction, and the adjacent recessed portions. A lower arc-shaped ridge 29a that is in contact with the lower half of the inserted steel pipe 15 is formed in the upper open recess 26B. The lower open recess 27A, In 27B, the inserted steel pipe 15 is Is the upper arcuate ridges 30a is formed in contact with the part, it has upper and lower two arcuate protrusions 29a, the structure for supporting the reinforcing steel 15 at 30a.

  In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, the upper and lower circular arc-shaped ridges 29a and 30a are adjacent to the upper open recess 26B and the lower open recess. The axial penetrating portions 28B and 28C can be formed by upper and lower circular arc-shaped protruding portions 29a and 30a that are formed in contact with the boundaries of 27A and 27B and are adjacent to each other. In this case, as described in claim 3, the arc-shaped protrusions 29b and 30b can be formed in the recessed portions 26B and 27B at at least one intermediate position in the axial direction.

  Further, as described in claim 4, the steel pipe insertion port 31 at the end of the steel pipe insertion hole 25 can be provided with a steel pipe retaining protrusion 32. In this case, as described in claim 5, the steel pipe retaining protrusion 32 can be provided at a position where the steel pipe end support hole 31 a remains between the opening end of the steel pipe insertion port 31. Furthermore, as described in claim 6, the reinforcing steel pipe 15 can be chamfered only at the outer peripheral edge 34 at the insertion direction end.

  According to the load supporting platform for the transport carriage according to the present invention having the above-described configuration, the insertion hole of the reinforcing steel pipe is formed between the upper open recessed portion and the lower open recessed portion that are serially arranged in the axial direction, and the adjacent recessed portions. Because it is composed of an axial through-hole, make it a cross-sectional shape that does not leave a partition wall between the upper open recess and the lower open recess, and do not use an intermediate mold that can be inserted and removed in the axial direction. The steel pipe insertion hole can be formed with a mold that is divided into two parts, upper and lower. Even if the steel pipe insertion hole is configured as a hole that penetrates the side wall of the main body in the axial direction, an extremely short middle mold is used in combination. Therefore, the molding cost can be greatly reduced as compared with the conventional one.

  Moreover, according to the configuration of the present invention, the entire bottom surface of the upper open recessed portion and the lower open recessed portion is not a steel pipe support surface in contact with the steel pipe, but the lower arc-shaped protrusion provided in the upper open recessed portion. And the upper arc-shaped protrusion provided in the lower open recess, the steel pipe is supported, so that the steel pipe can be held almost without rattling while reducing the resistance when inserting the steel pipe. It can be done.

  In addition, according to the structure of Claim 2, it becomes a structure in which there exists a single perfect circular through-hole at the boundary of an upper open recessed part and a lower open recessed part, and a lower circular arc-shaped protrusion part Compared with the case where the upper arc-shaped ridge portion and the upper arc-shaped protruding portion are positioned apart from each other in the axial direction, the steel pipe can be stably supported and the support strength can be improved. In this case, if the length of the upper open recessed portion or the lower open recessed portion is increased, the length of the unsupported region of the steel pipe is also increased. However, according to the configuration of claim 3, the upper open recessed portion or the lower side While the length of the open recessed portion is increased to simplify the mold structure, the length of the unsupported region of the steel pipe can be shortened to stabilize the support of the steel pipe and improve the support strength.

  Moreover, according to the structure of Claim 4, even if it does not use the cover body which closes the steel pipe insertion port of the end of a steel pipe insertion hole after steel pipe insertion, the inserted steel pipe is unexpected by vibration at the time of use of a conveyance trolley, etc. In this case, according to the configuration of the fifth aspect, when the insertion of the steel pipe is started, the insertion end of the steel pipe is temporarily stored in the steel pipe end support hole outside the projection for retaining the steel pipe. Since it can position, steel pipe insertion work can be performed easily.

  Further, according to the configuration of claim 6, when inserting the reinforcing steel pipe, a lower arc-shaped ridge portion, an upper arc-shaped ridge portion, and a steel pipe retaining projection are provided at the outer peripheral edge of the insertion end. The possibility of cutting the steel pipe retaining protrusion is eliminated, and not only can the steel pipe be inserted smoothly, but also the steel pipe positioning action by the lower arc-shaped ridge and the upper arc-shaped ridge, When the steel pipe retaining protrusion is provided, it can be prevented that the retaining effect of the steel pipe retaining protrusion is lowered. Moreover, since the rear end of the steel pipe is not chamfered, when the steel pipe retaining protrusion is provided, a sufficient steel pipe retaining effect by the steel pipe retaining protrusion can be expected.

  A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 3, 1 is a back panel, 2 is a left panel, 3 is a right panel, and 4 is a load support. Wheels (a universal wheel, a fixed direction wheel, etc.) 5a to 5d are attached to the lower side of both ends of the back panel 1 and the lower side of the front ends of the left and right side panels 2, 3, respectively. The wheels 5a and 5b below the both ends of the back panel 1 are attached so that the mounting seats 6a and 6b protrude only inward (front) to the bottom ends of the bottom side members 7 of the back panel 1, The wheel 5c below the front end of the left panel 2 is attached so that its mounting seat 6c projects only inward (right side) below the front end of the lower side member 8 of the left panel 2, The wheel 5d on the lower front end is attached so that its mounting seat 6d protrudes only on the inner side (left side) below the front end of the lower side member 9 of the right panel 3.

  The left side panel 2 has a rear end portion of the lower side member 8 superimposed on a left side portion of a portion protruding forward from the lower side member 7 of the wheel mounting seat 6a on the lower side of the left end portion of the back panel 1. In this state, the vertical pin 10 and the bolt nut 11 are fixed to the back panel 1 at a right angle. The right side panel 3 has the rear end portion of the lower side member 9 superimposed on the right side portion of the portion protruding forward from the lower side member 7 of the wheel mounting seat 6b below the right side end portion of the back panel 1. In this state, the vertical pins 12 are connected so as to be swingable in the horizontal direction. Further, as shown in FIG. 1 and FIG. 2, the left and right side column parts 1a and 1b of the back panel 1 and the rear side column parts 2a and 3a of the left and right side panels 2 and 3 are respectively connected to two upper and lower connecting members 13, 14 are connected. These connecting members 13 and 14 are fixed to the left and right side columns 1a and 1b on the back panel 1 side so as not to be horizontally swingable, and are attached to the rear columns 2a and 3a on the left and right panels 2 and 3 side. On the other hand, it is loosely fitted in a state allowing rotation around the axis of the rear column portions 2a, 3a. Therefore, the vertical pin 12 that becomes the horizontal axis of the right and left horizontal direction of the right panel 3 is disposed concentrically with the rear column portion 3 a of the right panel 3.

  As shown in FIG. 3, the load support base 4 is a rectangular board made of synthetic resin, and uses steel pipes for reinforcement 15 in the lateral direction (in the illustrated example, three steel pipes are used. (But not limited) are embedded at appropriate intervals in the front-rear direction, and a pair of left and right bearing projections 16 and 17 project rearward from the two positions near the left and right ends of the rear side. A rod 19 and an operation member 20 constituting the locking device 18 are provided. On the other hand, the lower side member 7 of the back panel 1 is for bearings fitted between the pair of left and right bearing protrusions 16 and 17 of the load support base 4 at both left and right ends overlapping the wheel mounting seats 6a and 6b. The projecting pieces 21 and 22 are integrally formed by cutting and raising, and the projecting pieces 21 and 22 for bearings and the projecting pieces 16 and 17 for bearings on the side of the load supporting base 4 are coupled to each other by a horizontal support shaft. 4 is connected to the lower side of the back panel 1 so as to be raised and lowered.

  Thus, the left and right sides of the load support table 4 are supported on the lower side members 8 and 9 of the left and right side panels 2 and 3 by causing the load support table 4 to fall to the horizontal state in the forward and lower direction. In this state, the locking device 18 locks the front end portions of the left and right sides of the load support base 4 to the lower side members 8 and 9 of the left and right side panels 2 and 3, and the load support base 4 and the left and right side panels 2 and 2. 3, and engaging pieces 23 a provided on the lower side members 8, 9 of the left and right side panels 2, 3 so as to engage with both ends of the rod 19 on the load support base 4 side, 23b. The operating member 20 is pivotally supported at its rear side so that it can swing up and down. When the operating member 20 is moved upward, the rod 19 moves horizontally in parallel and switches to the locking position for the locking pieces 23a and 23b. Then, by returning to the lower movement limit posture in which the upper surface is flush with the upper surface of the load support base 4, the rod 19 is horizontally translated backward to be switched to the engagement operation position with respect to the locking pieces 23a and 23b. It is configured.

  Therefore, when the transport carriage is folded as shown in FIG. 2, the rod 19 is switched to the unlocking position by the operation member 20 to release the lock of the load support base 4, and then the load support base 4 is moved to the back panel 1. Is switched to a folding posture in which the right side panel 3 is horizontally swung inward and the load supporting base 4 in the standing posture is sandwiched between the back panel 1 and the right side panel 3. When using the transport carriage, the right support panel 3 is horizontally swung outward and the load support base 4 is laid down forward and downward in a state where the right support panel 4 is returned to the posture at a right angle forward with respect to the back panel 1. Both sides are supported on the lower side members 8 and 9 of the left and right side panels 2 and 3, and the rod 19 is switched to the locking position by the operation member 20 so that the load supporting base 4 is placed under the left and right side panels 2 and 3. What is necessary is just to latch on the side members 8 and 9. In addition, when the load support base 4 is supported on the lower side members 8 and 9 of the left and right side panels 2 and 3, the rod 19 may be configured to automatically engage with the locking pieces 23a and 23b. it can.

  Next, the detailed structure of the load support 4 will be described. As shown in FIGS. 4 and 5, a required number of reinforcing steel pipes 15 are embedded in a rectangular plate-shaped main body 24 made of synthetic resin. The steel pipe insertion hole 25 for inserting the reinforcing steel pipe 15 separately is provided in the horizontal direction. Each steel pipe insertion hole 25 has a short upper open recessed portion 26A located at both ends, a short lower open recessed portion 27A disposed inside thereof, and a length alternately disposed in the axial direction at an intermediate position. The upper open recess 26B, the lower open recess 27B, and the axial through portions 28A to 28C formed between adjacent recesses are formed.

  As shown in FIGS. 5 to 7, the bottom surface 26 b of each upper open recess 26 </ b> B and the bottom surfaces 27 a and 27 b of each lower open recess 27 </ b> A and 27 </ b> B are formed on a semi-cylindrical surface along the lower half of the reinforcing steel pipe 15. The lower arc-shaped ridges 29a and 29b that are in contact with the lower half of the inserted steel pipe 15 are formed at both ends in the axial direction and at one central portion on the bottom surface 26b of each upper open recess 26B. On the bottom surface 27a of the lower release recessed portion 27A, upper arc-shaped ridge portions 30a that are in contact with the upper half of the inserted steel pipe 15 are formed at both ends in the axial direction, and the lower release recessed portion 27B On the bottom surface 27b, upper arc-shaped protrusions 30a and 30b that are in contact with the upper half of the inserted steel pipe 15 are formed at both ends in the axial direction and at one central position. Therefore, between the recesses 26B and 27A adjacent in the axial direction and between the recesses 26B and 27B, the lower arc-shaped protrusion 29a and the upper arc-shaped protrusion 30a located in contact with the boundary of the both recesses are described above. The axial through portions 28B and 28C are configured.

  Each steel pipe insertion hole 25 is provided with a steel pipe insertion port 31 that opens to the main body side surface 24a at one end (the end on the left panel 2 side in the illustrated example), and the steel pipe insertion port 31 has a steel pipe between the opening ends. A steel pipe retaining protrusion 32 is provided at a position where the end support hole 31 a is left, specifically at a position in contact with the upper open recess 26 A adjacent to the steel pipe insertion port 31. As shown in detail in FIG. 9, the steel pipe retaining protrusions 32 are provided in a pair of left and right, each having a cross-sectional saw blade type check structure in which the protrusion height increases toward the steel pipe insertion direction side. It is. The other end of each steel pipe insertion hole 25 (the end on the right panel 3 side in the illustrated example) is closed by a wall 33 that forms the main body side surface 24b.

  As an example of specific numerical values, when the outer diameter of the reinforcing steel pipe 15 to be used is 25.4 mm, for example, the bottom surface 26b of each upper open recessed portion 26B and the bottom surface 27a of each lower open recessed portion 27A, 27B, 27b can have a radius of about 13.5 mm, and the arcuate surfaces in contact with the steel pipes of the arc-shaped protrusions 29a to 30b can have a radius of about 13 mm. In this embodiment, the steel pipe insertion port 31 is formed in a true circle having the same inner diameter as the arc surface radius in contact with the steel pipe of the arc-shaped protrusions 29a to 30b, and is provided at both ends in the axial direction of each steel pipe insertion hole 25. The bottom surface 26a of the upper open recessed portion 26A is formed as a semi-cylindrical surface having the same inner diameter as the arc surface radius in contact with the steel pipe of the arc-shaped protrusions 29a to 30b. Moreover, since the main part including each recessed part 26A-27B of the main body 24 is shape | molded by the metal mold | die divided into two up and down, as shown to FIG. Is formed. Of course, as is conventionally known, when the main body 24 is formed, each steel pipe insertion hole 25 is formed as shown by the phantom line in FIG. 4 for the purpose of reducing the weight by reducing the material used and preventing distortion at the time of forming. The main region 24c other than the region can be formed into a lattice structure having openings penetrating up and down, and a number of recessed portions can be arrayed and formed in other regions such as the peripheral portion on the lower side.

  As shown in FIG. 8, the reinforcing steel pipe 15 used is chamfered so that the outer peripheral edge 34 has a protruding curved surface only at the insertion end at one end in the axial direction. Thus, the reinforcing steel pipe 15 is inserted into each steel pipe insertion hole 25 of the main body 24 from the side of the steel pipe insertion port 31 to assemble the load support base 4. When inserting the reinforcing steel pipe 15, the chamfered outer peripheral edge is inserted. Insertion of the steel pipe can be started from a state in which the steel pipe insertion end having 34 is fitted and supported in the steel pipe end support hole 31 a in the steel pipe insertion port 31. In the insertion process of the steel pipe 15, when the insertion end passes through the arc-shaped protrusions 29 a to 30 b in the recessed portions 26 B, 27 A, 27 B, there is some resistance due to deformation of the steel pipe in the axial direction. However, there is almost no fear of cutting off the arc-shaped ridges 29a to 30b due to the presence of the chamfering outer peripheral edge 34 at the insertion end, and the arc-shaped ridges 29a in the respective recessed portions 26B, 27A, 27B. Coupled with the non-sliding contact with the bottom surfaces 26b, 27a, 27b except for ~ 30b, it can be inserted relatively easily and smoothly.

  As shown in FIG. 8, when the insertion end of the reinforcing steel pipe 15 reaches the end wall portion 33 of each steel pipe insertion hole 25, the rear end 35 whose outer peripheral edge is not chamfered is a steel pipe in the steel pipe insertion port 31. It passes through the retaining protrusion 32 and enters the upper open recess 26A. Insertion of the steel pipe 15 is completed in this state. However, there is a risk that the strong steel pipe 15 may come out of the steel pipe insertion hole 25 due to vibration during use of the transport carriage. It can prevent reliably by the contact with the protrusion part 32 for use.

  In the illustrated embodiment, as shown in FIG. 4, the foremost reinforcing steel pipe 15 is also used as a support shaft for supporting the operation member 20 of the locking device 18. Accordingly, the central portion in the axial direction of the steel pipe insertion hole 25 into which the foremost reinforcing steel pipe 15 is inserted is formed with a recess 36 formed by cutting out from the front side of the main body 24 in order to fit the operation member 20. The reinforcing steel pipe 15 that overlaps and is opened in the recessed portion 36 and that passes through the recessed portion 36 by insertion passes through the shaft hole of the operating member 20.

  In the above embodiment, the steel pipe insertion port 31 has a structure that requires an intermediate mold that can be inserted and removed in the axial direction. The upper open recess 26A adjacent to the inside of the steel pipe insertion port 31 is formed on the side surface of the main body. By extending to 24a and opening it to the main body side surface 24a, a structure that does not require an insertable / removable middle mold is possible. In this case, the side open end of the upper open recess 26A on the steel pipe insertion side becomes the upper open steel pipe insertion port 31 provided with the steel pipe retaining protrusion 32. Moreover, the lower half part of the steel pipe insertion port 31 in the above-described embodiment is opened downward, and the upper open recess 26A adjacent to the inside of the lower release steel pipe insertion port 31 is appropriately connected from the end on the steel pipe insertion port 31 side. A steel pipe retaining protrusion 32 is formed on the side surface at a position inside the distance, and a portion outside the steel pipe retaining protrusion 32 on the bottom surface of the upper open recess 26A is used as a steel pipe end support hole 31a. It is also possible to configure as described above.

  In the above embodiment, the load support base according to the present invention is shown as the load support base 4 of the foldable transport cart supported by the up and down pivots. However, the load support base of the transport cart that cannot be folded is shown. Even when implemented as a load support base for a foldable transport cart, the folding structure of the transport cart and the configuration of the load support base locking device 18 are the same as those of the above embodiment. It is not limited to.

It is a perspective view which shows the whole conveyance trolley | bogie using the load support stand which concerns on this invention. It is a top view which shows the state which folded the conveyance trolley | bogie. It is a cross-sectional top view in the state which separated the load support stand. It is an expansion detailed top view of a load support stand. Fig. A is a plan view showing the left half of the region including one steel pipe insertion hole of the load support base body, and Fig. B is a longitudinal sectional view taken along line A of Fig. A. FIG. B includes a longitudinal sectional view of a terminal portion of the steel pipe insertion hole not included in FIG. It is an expanded longitudinal cross-sectional view in the B line of FIG. 5A. It is an expanded longitudinal cross-sectional view in the C line of FIG. 5A. It is a figure which shows FIG. 5B in the steel pipe insertion state. It is a figure which shows the detail of a steel pipe insertion opening, A figure is a side view, B figure is a cross-sectional plan view, C figure is the principal part enlarged view of B figure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Back panel 2 Left side panel 3 Right side panel 4 Load support stand 5a-5d Wheel 15 Reinforcement steel pipe 16, 17, 21, 22, Bearing protruding piece 18 Load support stand locking device 24 Synthetic resin main body 25 of load support stand Steel pipe insertion holes 26A, 26B Upper open recessed portions 26a-27b Recessed bottom surfaces 27A, 27B Lower open recessed portions 28 Axial through portions 29a, 29b Lower arc-shaped ridges 30a-30b Upper arc-shaped ridges 31 Steel tubes Insertion port 31a Steel pipe end support hole 32 Steel pipe retaining projection 33 Wall part closing steel pipe insertion hole Chamfered outer peripheral edge 35 of steel pipe insertion end Rear end of steel pipe not chamfered

Claims (6)

  A load carrier base for a transport carriage in which a reinforcing steel pipe is embedded in a flat rectangular main body formed of a synthetic resin, wherein the reinforcing steel pipe is inserted into a steel pipe insertion hole formed in the main body in an axial direction. The steel pipe insertion hole is composed of an upper open recessed portion and a lower open recessed portion that are alternately arranged in the axial direction, and an axial through portion formed between adjacent recessed portions, and the upper open recessed portion. A lower arc-shaped ridge that contacts the lower half of the inserted steel pipe is formed inside, and an upper arc-shaped ridge that contacts the upper half of the inserted steel pipe is formed in the lower open recess. Is formed, and is configured to support the reinforcing steel pipe with these upper and lower circular arc-shaped ridges.   The upper and lower arc-shaped ridges are formed in contact with the boundary between the upper open recess and the lower open recess adjacent to each other, and the axial penetrating portion is constituted by the upper and lower arc-shaped protrusions adjacent to each other. The load carrier for the transport carriage according to claim 1, wherein   The load support for a transport carriage according to claim 2, wherein the arcuate ridge is formed in at least one intermediate portion in the axial direction of the recessed portion.   The load support base for conveyance carts according to any one of claims 1 to 3, wherein a steel pipe insertion opening at an end of the steel pipe insertion hole is provided with a steel pipe retaining protrusion. 5. The load support for the transport carriage according to claim 4, wherein the steel pipe retaining protrusion is provided at a position where a steel pipe end support hole is left between an opening end of the steel pipe insertion port. 6. The load support for a transport carriage according to any one of claims 1 to 5, wherein the reinforcing steel pipe is chamfered only at the outer peripheral edge at the end in the insertion direction.

Images