JP3164763U - Transport truck connection structure - Google Patents

Abstract

An object of the present invention is to provide a loading platform connection structure for a transportation cart that facilitates an assembling operation for coupling a plurality of upper and lower loading platforms provided on a transportation cart via a support pipe and enhances the stability of the support pipe and the loading platform. A nut base having a shape that can be inserted into a hollow of a support pipe, and a nut having a diameter larger than a hollow diameter of the support pipe and having a diameter larger than the hollow diameter of the support pipe. It comprises a flange 53 that is hooked to the end surface, and a concave groove portion 54 for caulking that is formed in the outer peripheral wall of the nut base and is recessed inward, and the bolt portion has a head and is screwed into the nut portion. It consists of an end bolt part composed of a threaded part 62, and the hook part is hooked on both end faces of the support pipe, the nut part is fitted into the support pipe and fixed by caulking, The bolt portion is penetrated from the upper surface, and the screw portion is fastened to the nut portion. [Selection] Figure 5

Description

  The present invention relates to a structure for connecting loading platforms provided in upper and lower stages on a transport carriage.

As a structure that connects the loading platform (top plate) arranged in multiple upper and lower stages with a transporting cart, pass through bolts through the struts sandwiched between the upper and lower loading platforms, and the upper surface of the upper loading platform is the head of the through bolts A structure is known in which the end of a through bolt that is locked and protrudes from the bottom surface of a lower loading platform is fastened and connected to a nut.
As this type of through bolt, for example, in the handrail mounting structure disclosed in Japanese Utility Model Laid-Open No. 62-199437, the head of the through bolt is locked to the mounting base via a washer, and the hollow of the cylindrical column is penetrated. Further, a structure in which a screw tip protrudes onto a lower head member of a handrail and is tightened with a nut is also disclosed.

However, in the above configuration, since the upper end portion of the cylindrical support column abuts the bottom surface of the lower head member, the contact surface between the cylindrical support member and the lower head member is only the annular portion at the upper end of the cylindrical support member, If the column has a small diameter, an offset load may be applied.
In particular, when the resin pipe is molded like a loading platform of a carriage, if a metal pipe is used as a support and a through bolt is attached therein, it causes rib deformation on the back surface of the loading platform.
Further, in the case of an assembly structure by a user, there is a problem that an assembling operation in which a long through bolt is inserted into a pipe serving as a support to connect the upper and lower cargo beds becomes complicated and the assembling time is increased.

Japanese Utility Model Sho 62-199437 See Fig. 6

  The problem to be solved by this invention is that the assembly work of connecting the upper and lower multistage loading platforms provided on the transportation cart through the support pipe is facilitated, and the stability of the transportation cart with the stability of the support pipe and the loading platform is improved. The object is to provide a platform connection structure.

In order to achieve the above object, the present invention provides a device according to claim 1,
A support pipe is interposed between the upper and lower loading platforms, and a bolt that penetrates the loading platform is screwed into a nut portion fixed in the hollow at the end of the supporting pipe to fix the loading platform and the support pipe. A carrier truck connecting structure of
A nut base having a shape that can be inserted into the hollow of the support pipe, and a hook that is provided on one end surface of the nut base and has a larger diameter than the hollow diameter of the support pipe and is hooked to the end surface of the support pipe And a concave groove portion for caulking that is formed on the outer peripheral wall of the nut base and is recessed inward,
The bolt part has an end bolt part having a head part and a screw part screwed into the nut part,
The hook part is hooked on both end faces of the support pipe, the nut part is fitted to the support pipe and fixed by caulking,
The bolt portion is penetrated from the back surface of the loading platform or the upper surface of the loading platform, and the screw portion is fastened to the nut portion.
In the device of claim 2,
The bolt part has an end bolt part and a pair of upper and lower screw parts that can be screwed into nut parts of a support pipe provided at upper and lower ends penetrating the cargo bed, and no head is provided. It consists of a relay bolt part.
In the invention of claim 3,
A head fitting receiving portion is formed on the upper surface of the uppermost loading platform and has a diameter larger than that of the bolt insertion hole through which the bolt main body is inserted to fit the head portion of the bolt portion.

A bolt part and a nut part are used for each connection point between the support pipe and each loading platform without using a through bolt, and the nut part can be fixed by simply fitting the end of the support pipe and caulking the support pipe.
In addition, since the end surface of the support pipe is always covered with the flange of the nut portion, the contact area is greatly increased compared to the case of only the end surface of the support pipe even if the support pipe collides with the loading platform, and the bolt portion is strengthened. Even when tightened, the ribs of the cargo bed are not deformed, and stable connection without backlash can be performed.
When the loading platform has two levels, the end bolts are used only.
If the loading platform exceeds two stages, use end face bolts to connect the support pipes that contact the uppermost loading platform and the support pipes that contact the lowermost loading platform, and otherwise use relay bolts. Well, even if the loading platform is connected in multiple stages to an arbitrary height, it can be reliably connected.

1 is a perspective view of a transport cart according to Embodiment 1. FIG. (A) is an exploded perspective view which shows before attachment of a support | pillar and a nut part, (b) is a perspective view which shows after attachment. It is a perspective view of the front-end | tip of a support pipe which shows the contact surface part to the loading platform of the collar part of a nut part. It is a disassembled perspective view of the bolt part for upper stages, and the top plate of an upper stage. It is a perspective view which shows the cross section of the state which connected the upper stage top plate and the support pipe with the bolt part for upper stages. It is a disassembled perspective view of the lower bolt part and the lower top plate. It is a perspective view which shows the cross section of the state which connected the lower top plate and the support pipe with the lower bolt part. It is a perspective view which shows the cross section of the state which fastened the handle | steering-wheel and the support pipe together using the bolt part for relay on both sides of the upper top plate. (A) is an example of a bolt part for relay, and (b) is a front view showing a different example of the bolt part for relay. It is a perspective view of the conveyance trolley | bogie which has a three-stage loading platform. It is principal part sectional drawing of the support | pillar of FIG. 10, and a loading platform.

  In this device, by fixing the nut part to both ends of the support pipe, the end surface of the support pipe is covered with the flange part of the nut part to increase the contact area with the load bed and prevent deformation and damage of the load bed when tightening with the nut. Realized strong and stable connection between support pipe and loading platform.

Hereinafter, an embodiment of a carrier connection structure of a transport cart according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the transport cart 1 according to the first embodiment has two upper and lower loading platforms 2A and 2B, and four support pipes 4 are provided along the corners between the loading platforms 2A and 2B. The pipe 4 and the loading platforms 2A and 2B are connected to each other. C is a caster as a wheel.

[Cargo]
In this embodiment, upper and lower two-stage synthetic resin loading platforms 2A and 2B are provided.
The loading platforms 2A and 2B are formed with holes 21 through which the screw portions 62 of the bolt portions 6 described later are inserted at the four corners (see FIGS. 4 to 7).
Each hole 21 formed in the upper loading platform 2 </ b> A is integrally formed with an enlarged hole portion 22 that expands at the upper portion of each hole 21 to fit the head portion 61 of the bolt portion 6. In this embodiment, a common structure is used for the lower loading platform 2B, and the versatility is enhanced.

[Support pipe]
The support pipe 4 is made of a metal pipe, but may be a synthetic resin pipe having a predetermined strength.
Although a circular pipe is used in the illustrated example, a square pipe may be used.
And it is preferable to provide the below-mentioned guide recessed part 41 in the up-and-down both ends side of each support pipe 4 (refer FIG. 2).

[Nut part]
A nut portion 5 and a bolt portion 6 are used as the connecting means.
As shown in FIGS. 2 and 3, the nut portion 5 is provided with a screw hole 51 for screwing a screw portion 62 of a bolt portion 6 described later along the center line.
A nut base 52 set to an outer diameter that can be inserted into the hollow of the support pipe 4, and a support pipe 4 provided on the outer end surface of the nut base 52 and having a diameter larger than the hollow diameter of the support pipe 4. And a concave groove portion 54 for caulking that is formed in the peripheral wall of the nut base portion 52 and is recessed inwardly in an annular shape.

  The recessed groove portion 54 is formed at a position aligned with the guide recessed portion 41 when the nut base portion 52 is fitted to the support pipe 4, but is formed intermittently in the circumferential direction of the outer wall with the axis of the nut base portion 52 as the center. It may be a plurality of recesses, or may be a single recess or an annular groove as shown in the example.

  In this embodiment, since the concave groove portion 54 is formed at a position in contact with the flange portion 53, when the nut portion 5 is caulked, the nut portion 5 is fitted to the support pipe 4 using the flange portion 53 as a stopper. In this state, the nut portion 5 can be easily fixed to the end portion of the support pipe 4 by pressing the guide recess 41 along the end portion of the support pipe 4 and caulking the pipe.

That is, at the end of the support pipe 4, a guide concave portion 41 having a flat bottom at the groove bottom is formed in advance to guide the caulking position.
By tightening the end portion of the support pipe 4 along the guide concave portion 41 with a pipe caulking tool or the like, the end portion of the support pipe 4 can be easily caulked in the concave groove portion 54.

When the nut portion 5 is fixed to the support pipe 4, the flange portion 53 covers the end face opening of the support pipe 4 as shown in FIG. 3.
Accordingly, in the present embodiment, the entire surface of the flange portion 53 can be used as an abutting surface with the loading platform 2A, 2B with respect to the end surface of the conventional support pipe 4 which has only the thickness of the pipe. And the contact area of the support pipe 4 can be expanded.

[Bolt part]
In the present embodiment, the bolt portion 6 has a head portion 61 having a diameter larger than that of the screw hole, and has a screw portion 62 that is screwed into the screw hole of the nut portion 5.
The bolt part 6 may have a common shape, but in this embodiment, the upper stage bolt part 6A is used to connect the upper stage carrier 2A and the upper end of the support pipe 4 (see FIGS. 4 and 5). ), A lower bolt portion 6B is used to connect the lower loading platform 2B and the lower end of the support pipe 4 (see FIGS. 6 and 7).

As shown in FIG. 4, the upper bolt portion 6A has a slightly thinner head (61 'for convenience of explanation) and a shape other than a circular shape in a plan view. It has a two-sided shape that is substantially oval in plan view.
On the other hand, the expanded hole portion 22 formed on the upper surface of the upper loading platform 2A has a cross-sectional shape that allows the head portion 61 'to be fitted without a gap (see FIG. 5).

Accordingly, when the support pipe 4 is attached to the upper loading platform 2A, the screw portion 62 of the upper bolt portion 6A is inserted through the hole 21 of the loading platform 2A from above, and the head portion 61 ′ is opened to the expanded hole portion. 22 is fitted.
Then, the screw hole 51 of the nut portion 5 at the upper end of the support pipe 4 to which the nut portion 5 is fixed is screwed into the screw portion 62 protruding from the bottom surface of the upper loading platform 2A, and is fastened and attached (see FIG. 5).

Next, the lower bolt portion 6B has a head portion 61 that can be tightened with a spanner or the like, and a hexagon bolt is used in this embodiment (see FIG. 6).
Therefore, in order to attach the support pipe 4 to the lower loading platform 2B, the screw portion 62 of the lower bolt portion 6B is inserted and penetrated from below the hole 21 (loading platform bottom side) of the loading platform 2B. 62 is screwed into the screw hole 51 of the nut portion 5 at the lower end of the support pipe 4 shown in FIG.
Then, the lower end of the support pipe 4 can be fixed to the lower loading platform 2B by tightening the head 61 of the bolt portion 6B protruding from the bottom surface of the lower loading platform 2B with a spanner or the like (see FIG. 7).

[handle]
FIG. 8 shows a structure in which the support portion 31 of the handle 3 attached on the upper stage carrier 2A and the support pipe 4 fixed to the upper stage carrier 2A are fastened together.
In this embodiment, as shown in FIG. 1, the handle 3 is composed of a pipe that is bent in a substantially horizontal U-shape, and columnar support portions 31 are suspended from both lower ends.
Further, a connecting piece 32 that is integrally fixed to the lower end of the support portion 31 and that extends horizontally and forward may be provided for fixing to the loading platform 2A (see FIG. 1).

[Relay bolt]
When the support portion 31 and the support pipe 4 are fastened together with the upper loading platform 2A, the upper bolt portion 6A is not used but the relay bolt portion 6C is used.
The relay bolt portion 6C has a screw portion 62 ′ (screw not shown) that is screwed into the screw hole 51 of the nut portion 5 above and below without providing the head portion 61 of the above embodiment. Yes.
Further, a hook-like portion 63 not engraved with a screw is formed between the screw portions 62 'and is inserted into the hole 21 of the loading platform 2A.

A nut 5 ′ having no flange is built in the lower part of the support portion 31 of the handle 3 and is fixed in the support portion 31 by welding or the like.
Therefore, with the screw portion 62 'above the relay bolt portion 6C screwed in advance to the nut 5', the bolt portion 6C is passed through the upper loading platform 2A, and the lower screw portion 62 'is passed through the upper screw portion 62A. It protrudes downward from the bottom surface of the loading platform 2A.

At this time, if a receiving groove 63 for a + or − driver is provided on the bottom surface of the lower screw portion 62 ′ (see FIG. 9A), the position of the bolt portion 6C in the height direction using a screwdriver. Adjustments can be made.
Further, as shown in FIG. 9B, if a two-sided width is provided, a spanner can be used, and both the receiving groove and the two-sided width may be provided.
Then, the lower threaded portion 62 'is screwed and tightened into the screw hole 51 of the nut portion 5 fixed to the upper end of the support pipe 4, and the handle 3 and the support pipe 4 are sandwiched between the upper loading platform 2A. Can be attached at the same time.
Further, when the connecting piece 32 is provided as in the illustrated example, the connecting piece 32 can be fixed to the upper surface of the loading platform 2A with a screw or the like, and the fixing of the handle 3 can be strengthened.

As shown in FIGS. 10 and 11, the transport cart 1 according to the second embodiment has a structure including three or more stages of loading platforms in which one or a plurality of middle loading platforms 2 </ b> C are provided between upper and lower loading platforms 2 </ b> A and 2 </ b> B. Yes.
In this case, the connection structure of the support pipe 4 with respect to the uppermost loading platform 2A and the lowermost loading platform 2B conforms to the first embodiment, and the description thereof is omitted.

Accordingly, the connection of the upper and lower support pipes 4 to the intermediate carrier 2C will be described. In the handle 3, a nut 5 'having no flange portion is fixed to the support portion 31, but here, the support pipe 4 connected to the upper side is fixed. A nut portion 5 is used at the lower portion of.
Similarly to the above embodiment, the intermediate loading platform 2C can have the same shape as the upper loading platform 2A.
And the support pipe 4 which fixed the nut part 5 to the upper and lower ends is used, and the bolt part 6C for said relay is used as a bolt part.

And the connection structure of the loading platform and the support pipe 4 is attached in the same manner as the handle 3 in connection with the upper support pipe 4.
Moreover, since the connection between the loading platform and the lower support pipe 4 is attached in the same manner as the upper-stage bolt portion 6A and the support pipe 4, description thereof will be omitted.
The present invention is not limited to the above embodiment, and various design changes can be made without changing the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Carriage 2A Upper loading platform 2B Lower loading platform 2C Middle loading platform 3 Handle 4 Support pipe 5 Nut portion 6 Bolt portion 6A Upper bolt portion 6B Lower bolt portion 6C Relay bolt portion 21 Hole 22 Expanded hole Part 31 support part 41 guide recessed part 51 screw hole 52 nut base part 53 flange part 54 recessed groove part 61 head part 62 screw part

Claims (3)

A support pipe is interposed between the upper and lower loading platforms, and a bolt that penetrates the loading platform is screwed into a nut portion fixed in the hollow at the end of the supporting pipe to fix the loading platform and the support pipe. A carrier truck connecting structure of
A nut base having a shape that can be inserted into the hollow of the support pipe, and a hook that is provided on one end surface of the nut base and has a larger diameter than the hollow diameter of the support pipe and is hooked to the end surface of the support pipe And a concave groove portion for caulking that is formed on the outer peripheral wall of the nut base and is recessed inward,
The bolt part has an end bolt part having a head part and a screw part screwed into the nut part,
The hook part is hooked on both end faces of the support pipe, the nut part is fitted to the support pipe and fixed by caulking,
A loading platform connection structure for a transport cart, wherein a bolt portion is passed from the back surface of the loading platform or the upper surface of the loading platform and a screw portion is fastened to the nut portion.   The bolt part has an end bolt part and a pair of upper and lower screw parts that can be screwed into the nut part of the support pipe provided on the upper and lower sides of the cargo bed, and the head is not provided. The structure for connecting a cargo bed of a transport cart according to claim 1, comprising a bolt portion.   The head fitting receiving part which fits the head of a bolt part with a larger diameter than the bolt insertion hole which penetrates a bolt main part is formed in the upper surface of the uppermost loading platform. Loading platform connection structure.

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