JP2015137036A - Telescopic carriage bogie - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telescopic carriage bogie in which the length of a load-carrying platform can be easily changed corresponding to the size, the volume, etc. of a cargo.SOLUTION: In a telescopic carriage bogie 1 which comprises a load-carrying platform 2 that comprises front wheels 7 and rear wheels 5 and can travel with a cargo loaded on an upper surface and a handle 3 that is provided at the rear side of the load-carrying platform 2, the load-carrying platform 2 is constituted through being divided into a load-carrying platform front half part 2b and a load-carrying platform rear half part 2a facing to each other. Each of the load-carrying platform front half part 2b and the load-carrying platform rear half part 2a includes at least two longitudinal frames which are arranged with a specified spacing in the lateral direction orthogonal to the traveling direction and extends in the travelling direction, and the longitudinal frames of one side of the load-carrying platform front half part 2b and the load-carrying platform rear half part 2a are inserted into the longitudinal frames of the other side, so as to be configured as telescopic in the traveling direction. The length of the load-carrying platform 2 in the traveling direction is adjustable and can be locked as a specified length by a lock mechanism 8.

Description

  The present invention relates to a transport carriage provided with a handle at one end of a cargo bed, and more particularly, to an extendable transport cart provided with a stepping-type assist mechanism.

  A transport cart having a handle at one end of a cargo bed is used for transporting luggage in factories and warehouses, and recently, a private carrier (delivery company) is used in the city (for example, patent literature). 1).

JP 2011-979 A

  However, since the length of the loading platform cannot be changed in the conventional transportation cart described in Patent Document 1 described above, the size of the loading platform varies depending on the type of luggage or the amount of luggage to be carried. There are problems that a plurality of kitchens must be provided, which is expensive and requires a large storage space.

  Therefore, the present invention has been made paying attention to such a problem, and it is intended to provide an extendable transport cart that can easily change the length of the cargo bed according to the size and amount of the cargo. Objective.

In order to achieve the above object, an extendable transport cart according to the present invention includes a front bed and a rear wheel, a load bed on which a load can be placed on an upper surface, and a handle provided on a rear side of the load bed. The retractable transport cart is provided, and the loading platform is divided into a first half of the loading platform and a latter half of the loading platform, and the first half of the loading platform and the latter half of the loading platform are each perpendicular to the traveling direction. There are at least two longitudinal frames arranged in the transverse direction with a predetermined interval and extending in the traveling direction, and one longitudinal frame of the front half of the loading platform and the latter half of the loading platform is inserted into the other vertical frame. Thus, it is configured to be extendable in the traveling direction, and the length of the loading platform in the traveling direction can be adjusted.
Here, each of the first half of the loading platform and the second half of the loading platform has four vertical frames arranged at predetermined intervals in the lateral direction, and two on both sides of the first half of the loading platform and the latter half of the loading platform. In the vertical frame, the vertical frame in the first half of the loading platform is passed through the vertical frame in the latter half of the loading platform, while in the two vertical frames on the inside, the loading platform is placed in the vertical frame inside the first half of the loading platform. It is good to comprise so that it can expand-contract through the longitudinal direction frame of the latter half part.
Further, in the loading platform, one of the longitudinal frames of the loading platform front half and the loading platform rear half is formed with a plurality of lock holes for determining the sliding distance of the loading platform at predetermined intervals in the traveling direction, The other vertical frame of the first half of the loading platform and the second half of the loading platform is formed with a lock pin loading / unloading hole that allows the leading end of the locking pin to be freely loaded and unloaded, and the leading end of the locking pin is extended from the locking pin loading / unloading hole. The length of the loading platform in the traveling direction is expanded and contracted by projecting into one of the plurality of locking holes of the vertical frame of the first half of the loading platform and the second half of the loading platform, and at a predetermined length. It is preferable to provide a lock mechanism for locking.
The lock mechanism is provided between the other two longitudinal frames of the front half and the rear half of the cargo bed, and supports the lock pin so that the lock pin can be moved back and forth in the lateral direction. And a rotation plate that is provided on the first base portion so as to be rotatable via a rotation shaft portion, and is connected to a rear end portion of the lock pin, and moves the lock pin in a lateral direction by the rotation. , A spring connected to a part of the rotating plate, and connected to the other part of the rotating plate, and the rotating plate is rotated against the spring so that the front end of the lock pin is the front half of the loading platform And an operation part that projects from the lock pin entrance / exit hole of the other vertical frame in the latter half of the loading platform into one of the plurality of lock holes in the vertical frame of the loading platform latter half. By operating its operation part Even better the loading platform can be locked in a predetermined length.
Further, the operation portion of the locking mechanism portion is between the other two longitudinal frames of the first half of the loading platform and the second half of the loading platform and is separated from the first base portion in one direction of the traveling direction. A second base portion provided at a position, an operation lever provided at the second base portion so as to be movable back and forth, a rear end portion of the operation lever provided at the second base portion, and a first base portion. It is further preferable to have a connecting rod that connects a part of the rotating plate.
The lock mechanism is provided in the first half of the cargo bed, and the second base part is provided on the back side of the first half of the cargo bed in the cargo bed. Is not projected outward from the loading platform, and is provided between the two vertical frames in the first half of the loading platform in a range where other fingers can reach while placing a finger or palm on the lateral frame on the front side of the first loading platform Even better.
In addition, at least one of the first half of the loading platform and the second half of the loading platform is joined between two or more vertical frames by two or more short horizontal frames extending in the horizontal direction. It is even better if the lateral frames are not aligned on a straight line but shifted in a stepwise manner.

In the telescopic transport cart according to the present invention, the loading platform is divided into a loading platform front half and a loading platform rear half, and one vertical frame of the loading platform front half and the loading platform rear half is the other longitudinal direction. Since it is configured to be able to extend and contract in the traveling direction by being inserted into the frame, and the length of the loading platform in the traveling direction can be adjusted, the length of the loading platform can be easily changed according to the size and amount of the load. be able to.
As a result, it is not necessary to have a plurality of carts with different sizes of loading platforms, and the cost can be reduced correspondingly, and a large storage space is not necessary.

It is a front view of the trolley | bogie for expansion-contraction of the embodiment which concerns on this invention (contraction state). It is a bottom view of the telescopic transport cart (contracted state) of the embodiment according to the present invention. It is a front view of the cart for expansion and contraction (extension state) of the embodiment concerning the present invention. It is a bottom view of the telescopic transport cart (extension state) of the embodiment according to the present invention. It is a top view which shows the structure of the loading platform latter half part which comprises the loading platform of the expansion-contraction conveyance trolley | bogie of embodiment which concerns on this invention. (A)-(c) is the front view which shows the structure of a loading platform latter half part, a left view, and the sectional view on the AA line in FIG. It is a top view which shows the structure of the loading platform front half part which comprises the loading platform of the extendable transport cart of embodiment which concerns on this invention. (A)-(d) It is the front view which shows the structure of the loading platform front half side, a right view, the BB sectional drawing in FIG. 7, and CC sectional drawing, respectively. FIG. 3 is a partially cutaway plan view showing a lock mechanism portion in a locked state in which a cargo bed is in an extended state in an extendable transport cart according to an embodiment of the present invention. It is a partially notched enlarged plan view which expands and shows the lock mechanism part in the locked state in the extendable transport cart of the embodiment according to the present invention. It is a partially cutaway top view which shows the lock mechanism part in a lock release state in the expansion | extension state in the loading carrier in the telescopic conveyance trolley | bogie of embodiment which concerns on this invention. It is a partially notched enlarged plan view which expands and shows the lock mechanism part in the lock release state in the telescopic transport cart according to the embodiment of the present invention. FIG. 5 is a partially cutaway plan view showing a lock mechanism portion in a locked state in which a cargo bed is in a contracted state in an extendable transport cart according to an embodiment of the present invention. It is the DD sectional view taken on the line in FIG. 13 of the locking mechanism part of the telescopic conveyance trolley | bogie of embodiment which concerns on this invention. (A), (b) is the EE sectional view taken on the line in FIG. 10, respectively, and the FF sectional view taken on the line in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an expandable / contractible transport cart (hereinafter sometimes simply referred to as a cart) 1 according to an embodiment of the present invention will be described with reference to FIGS.

  1 and 2 are a front view and a bottom view, respectively, of an extendable transport cart (contracted state) 1 according to an embodiment of the present invention. FIGS. 3 and 4 are a front view and a bottom view, respectively, of the extendable transport cart 1 in an extended state.

  As shown in FIGS. 1 to 4, the telescopic transport cart 1 is configured to be divided into a load carrier front half portion 2 b and a load carrier rear half portion 2 a that are opposite to each other and loaded in the direction of travel of the cart 1. A load carrier 2 that can be adjusted in length, a handle 3 that is foldably disposed on the rear end side in the longitudinal direction of the load carrier 2, and a fixed rear wheel support 4 on the rear side of the rear side of the load carrier 2. A pair of rear wheels 5, 5, a pair of front wheels 7, 7 provided via a caster-type front wheel support 6, which is rotatable (direction changeable) on the front side on the back side of the loading platform 2, and a lock The mechanism part 8 is provided.

  In this cart 1, the handle 3, the fixed rear wheel support portion 4, the pair of rear wheels 5, 5, the rotatable (direction changeable) caster type front wheel support portion 6, and the pair of front wheels 7, 7 Since it is the same as the conventional one, no particular explanation will be given. In other words, the cart 1 is characterized by the configuration of the expandable / contractible loading platform 2 and the lock mechanism portion 8, and the loading platform 2 and the lock mechanism portion 8 will be described in detail.

<Configuration of loading platform 2>
First, the structure of the loading platform 2 that can shrink in two stages will be described in detail.

  FIG. 5 is a plan view showing the structure of the loading platform rear part 2a constituting the loading platform 2 of the telescopic transport carriage 1 of this embodiment, and FIGS. 6 (a) to 6 (c) respectively show the configuration of the loading platform latter part 2a. It is the front view to show, a left view, and the sectional view on the AA line in FIG.

  FIG. 7 is a plan view showing the configuration of the loading platform front half 2b constituting the loading platform 2 of the telescopic transport carriage 1 of the present embodiment, and FIGS. 8A to 8D show the configuration of the loading platform front half 2b, respectively. 8 is a front view, a right side view, a sectional view taken along line BB in FIG. 7, and a sectional view taken along line CC.

  The loading platform 2 includes a loading platform rear half 2a configured as shown in FIGS. 5 and 6 and a loading platform front half 2b configured as illustrated in FIGS. 7 and 8. In addition, the handle | steering-wheel 3 is provided in the loading platform latter half part 2a, as shown in FIGS.

  As shown in FIGS. 5 and 6, the loading platform rear half 2a includes four longitudinal frames 2a1 to 2a4 spaced apart from each other at a predetermined interval in a transverse direction perpendicular to the traveling direction, and three short first frames. The lateral frame 2a5 and one long second lateral frame 2a6 are joined to each other. Here, the vertical frame and horizontal frame may be joined by bolts and nuts, screwing, riveting, or welding, etc. What is necessary is just to join a direction frame. In addition, joining of the vertical frame and the horizontal frame of the loading platform front half 2b is the same as that of the loading platform rear half 2a.

  Here, since the two outer vertical frames 2a1 and 2a4 need to pass the outer vertical frames 2b1 and 2b4 outside the loading platform front half 2b inside, the vertical frames 2b1 outside the loading platform front half 2b. , 2b4 and a hollow pipe.

  On the other hand, the two vertical frames 2a2 and 2a3 inside the loading platform rear half 2a need to be passed through the inside of the vertical frames 2b2 and 2b3 inside the loading platform front half 2b. It is made hollow for weight reduction.

  Further, since the loading platform 2 can be expanded and contracted in, for example, two stages, the longitudinal frames 2a2 and 2a3 of the loading platform rear half 2a are each slid by a length of the loading platform 2 at predetermined intervals in the traveling direction, for example, 20 cm intervals. A plurality of lock holes 2 a 21, 2 a 22, 2 a 31, 2 a 32 (in this case, two because of the two stages) for determining the interval are formed. However, in the present invention, it is of course possible that the slide interval can be adjusted in three or more stages, so it is of course possible to provide three or more lock holes in the traveling direction.

  On the other hand, as shown in FIGS. 7 and 8, the first half of the loading platform 2 includes four vertical frames 2b1 to 2b4, three short first horizontal frames 2b5, and one long second horizontal frame. 2b6 are joined to each other in a lattice shape by bolts / nuts, screwing, riveting, welding or the like. Here, as shown in FIG. 7 and the like, the short three first lateral frames 2b5 are installed on the right side of FIG. The first base portion 81 and the second base portion 85, which will be described later, constituting the portion 8 are secured, and the central two longitudinal frames 2b2 and 2b3 are connected to load the longitudinal frames 2b1 to 2b4. It is configured so that it is dispersed and not concentrated in one place as much as possible. It should be noted that the three first lateral frames 2a5 having a short cargo platform rear part 2a are also shifted in the forward direction only in the first lateral frame 2a5 at the center in the same manner as the first lateral frame 2b5 of the cargo platform front half 2b. Also good.

  The other two vertical frames 2b1 and 2b4 of the outer half of the loading platform and the latter half of the loading platform are passed through the centers of the vertical frames 2a1 and 2a outside the loading platform latter 2a, so that they are hollow. Although it is not necessary, it is composed of a hollow pipe for weight reduction.

  On the other hand, the two vertical frames 2b2 and 2b3 on the inner side are thicker and hollower than the vertical frames 2a2 and 2a3 because the vertical frames 2a2 and 2a3 on the inner side of the rear half 2a of the loading platform are required to pass inside. There is a need for.

  As described above, in the telescopic transport cart 1 of the present embodiment, the loading platform 2 is divided into the loading platform front half 2b and the loading platform rear half 2a, and the loading platform front half 2b and the loading platform rear half 2a Of the two vertical frames on both sides, the vertical frames 2b1 and 2b4 of the first half 2b of the loading platform are passed through the vertical frames 2a1 and 2a4 of the first half 2a of the loading platform. Since the longitudinal frames 2a2 and 2a3 of the loading platform rear half 2a are extended and contracted in the longitudinal frames 2b2 and 2b3 inside the loading platform front half 2b, the loading platform front half 2b and the loading platform rear half 2a are balanced. The expandable bed 2 can be configured without any one of the vertical frames being outside and all the other vertical frames being passed through the inside.

  Further, since the first base portion 81 and the second base portion 85, which will be described later, of the locking mechanism portion 8 are provided in the first half portion 2b of the loading platform, the two inner vertical frames 2b2 and 2b3 are respectively As shown in FIG. 7 and the like, the first base portion support portions 2b21, 2b31 and the second base portion support portions 2b22, 2b32, 2b23, 2b33 are provided, and the lock pin entrance / exit into which the lock pins 82, 82 enter / exit. Holes 2b24 and 2b34 are formed.

  Then, the first base portion support portions 2b21, 2b31 of the first half of the loading platform 2b and the lock mechanism portions 8 provided on the second base portion support portions 2b22, 2b32, 2b23, 2b33 are used to respectively fix the distal ends of the lock pins 82, 82. By projecting from the lock pin entrance / exit holes 2b24, 2b34 into any one of the plurality of lock holes 2a21, 2a22, 2a31, 2a32 of the vertical frames 2a1-2a4 of the load carrier rear half 2a, The length is expanded and contracted in two stages, and the length is locked at a predetermined length.

<Configuration of lock mechanism 8>
Next, the configuration and operation of the lock mechanism unit 8 will be described in detail.

  FIG. 9 is a partially cutaway plan view showing the lock mechanism portion 8 in the locked state with the loading platform 2 extended in the extendable transport cart 1 of the present embodiment, and FIG. 10 shows the lock mechanism portion 8 in the locked state. It is a partially notched enlarged plan view showing an enlarged view.

  FIG. 11 is a partially cutaway plan view showing the lock mechanism unit 8 in the unlocked state when the loading platform 2 is in the extended state in the telescopic transport cart 1 of the present embodiment, and the lock mechanism unit 8 in the unlocked state. It is a partially notched enlarged plan view showing an enlarged view.

  As described above with reference to FIG. 7, the lock mechanism 8 is provided between the two vertical frames 2b2 and 2b3 inside the first half 2b of the loading platform, and the lock pins 82 and 82 can be moved back and forth in the lateral direction. The first base portion 81 supported on the first base portion 81 is rotatably provided to the first base portion 81 via a rotation shaft portion, and is connected to the rear ends of the lock pins 82 and 82 via connection arms 83b and 83b. The rotation plate 83 that moves the lock pins 82 and 82 in the lateral direction by the rotation, the spring 84 connected to a part of the rotation plate 83, and the other part of the rotation plate 83 The rotating plate 83 is rotated against the connected spring 84, and the leading ends of the lock pins 82, 82 are moved from the lock pin entrance / exit holes 2b24, 2b34 of the vertical frames 2b1, 2b4 to the vertical frames 2a1, 2a. And an operation unit 85 to project the any one of the lock holes of the plurality of lock holes 2A21,2a22,2a31,2a32.

  The operation portion 85 includes a second base portion 85a provided between the two vertical frames 2b2 and 2b3 inside the loading platform front half portion 2b and spaced forward from the first base portion 81, and the second base portion 85a. An operation lever 85b provided on the second base portion 85a so as to be able to advance and retreat; a rear end portion of the operation lever 85b provided on the second base portion 85a; and a part of the rotating plate 83 provided on the first base portion 81. And a connecting rod 85c for connecting the two. Reference numeral 85d denotes the head of the operation lever 85b.

  Therefore, although the detailed operation will be described later, by operating the operation lever 85b of the operation unit 85, the length of the traveling walk of the loading platform 2 can be adjusted in two stages and locked in two stages.

  Next, the operation of the extendable transport cart 1 configured as described above will be described.

<The loading platform 2 is extended and the lock mechanism 8 is locked>
In this state, as shown in FIGS. 9 and 10, the load carrier 2 is in the extended state and the lock mechanism portion 8 is in the locked state in the telescopic transport cart 1, so that the lock pin 82 of the lock mechanism portion 8 is locked. , 82 project from the lock pin entrance / exit holes 2b24, 2b34 of the vertical frames 2b1, 2b4 to the lock holes 2a22, 2a32 on the front side of the plurality of lock holes 2a21, 2a22, 2a31, 2a32 of the vertical frames 2a1, 2a4. Are engaged.

  Therefore, in the telescopic transport cart 1, the loading platform 2 is in an extended state as shown in FIGS. 3 and 4, and a large number of luggage or large luggage can be placed on the loading platform 2.

<The loading platform 2 is extended and the lock mechanism 8 is unlocked>
Next, in order to bring the loading platform 2 into a contracted (shortened) state from the locked state when the loading platform 2 is in the extended state, it is necessary to release the locking mechanism portion 8 once.

  Specifically, as shown in FIGS. 9 and 10, the lock pins 82 and 82 of the lock mechanism unit 8 include a plurality of the vertical frames 2 a 1 and 2 a 4 through the lock pin insertion holes 2 b 24 and 2 b 34 of the vertical frames 2 b 1 and 2 b 4. Of the lock holes 2a21, 2a22, 2a31, 2a32 projectingly engaged with the lock holes 2a22, 2a32 on the front side, the head 85d of the operation lever 85b of the lock mechanism 8 is gripped, that is, on the front side. 9 and FIG.

  Then, the connecting rod 85c moves leftward (α direction) in FIGS. 9 and 10, and the rotating plate 83 rotates counterclockwise (β direction), via the connecting arms 83b and 83b. The front ends of the lock pins 82 and 82 of the lock mechanism 8 are pulled down in the γ direction from the lock holes 2a22 and 2a32, and the front ends of the lock pins 82 and 82 are retracted from the lock holes 2a22 and 2a32.

  As a result, as shown in FIGS. 11 and 12, the lock pins 82 and 82 of the lock mechanism 8 are disengaged from the lock holes 2a22 and 2a32, and the rear half 2a of the cargo bed 2 and the first half of the cargo bed are formed. The part 2b is in an expandable state.

  Therefore, with the lock pins 82 and 82 of the lock mechanism portion 8 disengaged from the lock holes 2a22 and 2a32, the rear half 2a of the load carrier 2a toward the front first half 2b or the front half 2b of the load carrier 2nd half. When it pushes toward the part 2a, the overlap part of the loading platform latter half 2a and the loading platform front half 2b will increase. That is, the projected area of the cargo bed 2 in plan view is reduced.

<The loading mechanism 2 is in the contracted state and the locking mechanism 8 is locked>
Then, the position of the tip of the lock pins 82, 82 of the lock mechanism portion 8 is adjusted to the position of the second-stage lock holes 2a22, 2a32 among the plurality of lock holes 2a21, 2a22, 2a31, 2a32, and the operation lever 85b. When the hand is released from the head 85d, the rotating plate 83 is rotated clockwise (η direction) by the elastic force of the spring 84, and the lock mechanism portion is connected via the connecting arms 83b and 83b as shown in FIG. The tip ends of the eight lock pins 82, 82 are sent out in the θ direction from the lock holes 2a21, 2a31, and the tips of the lock pins 82, 82 are engaged with the second-stage lock holes 2a21, 2a31.

  As a result, the lock pins 82 and 82 of the lock mechanism portion 8 are engaged with the second-stage lock holes 2a21 and 2a31, and the overlapping portion of the loading platform rear portion 2a and the loading platform front half portion 2b constituting the loading platform 2 is increased. That is, the loading platform 2 is locked in the contracted state.

  14 is a cross-sectional view taken along the line DD in FIG. 15A and 15B are a cross-sectional view taken along line EE in FIG. 10 and a cross-sectional view taken along line FF in FIG.

  Therefore, the telescopic transport cart according to the present embodiment is configured by dividing the loading platform 2 into the loading platform front half 2b and the loading platform rear half 2a that are opposed to each other, and one of the vertical loading platform half 2b and the loading platform rear half 2a. Since the direction frame is inserted into the other vertical frame so that it can be expanded and contracted in the traveling direction, and the length of the loading platform 2 in the traveling direction can be adjusted, the length of the loading platform 2 can be easily changed. Can do.

  As a result, it is not necessary to have a plurality of carts having different sizes of the loading platform 2, and the cost can be reduced correspondingly, and a large storage space is not necessary.

  In particular, the telescopic transport cart 1 of the present embodiment is provided with two stages of lock holes 2a21, 2a22, 2a31, 2a32 at predetermined intervals in the running direction in the longitudinal frames 2a2, 2a3 of the rear half 2a of the carrier. The vertical frames 2b2 and 2b3 of the front half 2b are provided with lock pin insertion holes 2b24 and 2b34 for allowing the front ends of the lock pins 82 and 82 to freely enter and exit, and the front ends of the lock pins 82 and 82 are provided with the lock pin insertion and exit holes 2b24. , 2b34, the length in the traveling direction of the loading platform 2 is expanded and contracted by projecting into any one of the plurality of locking holes 2a21, 2a22, 2a31, 2a32 of the vertical frames 2a2, 2a3 of the loading platform rear half 2a. At the same time, since the lock is made with a predetermined length, the stretched cargo bed 2 can be securely fixed.

  Further, in the telescopic transport cart 1 of the present embodiment, the lock mechanism portion 8 is provided between the two vertical frames 2b2 and 2b3 of the loading platform front half 2b, and advances and retracts the lock pins 82 and 82 in the lateral direction. A first base portion 81 that is freely supported, and is rotatably provided to the first base portion 81 via a rotation shaft portion, and is connected to the rear end portions of the lock pins 82 and 82 and is locked by the rotation. A rotation plate 83 for moving the pins 82 and 82 in the lateral direction, a spring 84 connected to a part of the rotation plate 83, and connected to the other part of the rotation plate 83 to rotate against the spring 84. The plate 83 is rotated so that the front ends of the lock pins 82 and 82 protrude into any one of the plurality of lock holes 2a21, 2a22, 2a31, 2a32 of the longitudinal frames 2a2, 2a3 of the loading platform rear part 8a. Operation unit 8 Has the door, because that is configured to lock with adjusting the loading platform 1 in two steps by operating the operation unit 85, it is possible to reliably fix the loading platform 2 with a simple configuration.

  Further, in the telescopic transport carriage 1 of the present embodiment, the operation portion 85 of the lock mechanism portion 8 is between the two longitudinal frames 2b2 and 2b3 inside the cargo bed front half 2b and from the first base portion 81. A second base portion 85a provided at a position distant from the front, an operation lever 85b provided on the second base portion 85a so as to be movable forward and backward, and a rear end portion of the operation lever 85b provided on the second base portion 85a And the connecting rod 85c that connects a part of the rotation plate 83 provided in the first base portion 81, the lock mechanism portion 8 can be configured with a simple structure.

  Further, in the telescopic transport cart 1 of the present embodiment, the second base portion 85a of the lock mechanism portion 8 is provided on the back side of the front of the cargo bed 2 where no handle is provided in the cargo bed 2, and at least in a locked state. Then, the operating lever head 86b gripped by the operator at the front end side does not protrude outward from the loading platform 2, and the loading platform in a range where other fingers can reach while placing a finger or palm on the lateral frame on the front side of the loading platform 2. Since it is provided between the other two longitudinal frames 2b1 and 2b4 of the front half 2b and the loading platform rear half 2a, the loading platform 2 can be easily expanded and contracted, and the operation lever can be operated even when locked. Since the head 85d of 85b does not project the operation lever head 86b outward from the loading platform 2, it is possible to prevent the lock mechanism portion 8 from malfunctioning even when the cart 1 is in use.

  In the telescopic transport cart 1 according to the embodiment, the three first horizontal frames 2b5 having a short first half 2b of the loading platform are shifted rearward only in the central first horizontal frame 2b5 and the vertical frames 2b2 and 2b2 are shifted backward. 2b3, since the first horizontal frame 2b5 in the center is positioned substantially in the center of the loading platform 2 even in the extended state of the loading platform 2 shown in FIG. Not only can the two longitudinal frames 2b2 and 2b3 be connected to prevent the load from being distributed to the longitudinal frames 2b1 to 2b4 and concentrate as much as possible in one place, but also the rigidity and load bearing performance of the entire loading platform 2 can be improved. Can do.

  In the description of the above-described embodiment, a plurality of lock holes 2a21, 2a22, 2a31, 2a32 are provided on the loading platform rear half 2a side, while a locking mechanism unit 8 is provided on the loading platform front half 2b side. However, the present invention is not limited to this, and a plurality of lock holes may be provided on the loading platform front half 2b side, while the locking mechanism portion 8 may be provided on the loading platform rear half 2a side.

  In the description of the above embodiment, the loading platform front half 2b and the loading platform rear half 2a constituting the loading platform 2 are each composed of four vertical frames 2a1 to 2a4 and 2b1 to 2b4, and the three first first horizontal frames. The directional frames 2a5 and 2b5 and one long second horizontal frame 2a6 and 2b6 have been described. However, the present invention is not limited to this and includes three or five or more vertical frames. Alternatively, the number of the short first horizontal frames may be two or four or more, and a vertical plate may be used by appropriately placing a top plate on these frames or using a panel without using a horizontal frame. In other words, it is sufficient that the first half 2b and the second half 2a of the loading platform can be configured to be extendable and contractible.

  Further, in the description of the above embodiment, only the first half of the loading platform 2b3 in which the first base portion 81 and the second base portion 85 that constitute the locking mechanism portion 8 of the loading platform first half 2b and the loading platform second half 2a are provided is a vertical frame. Only the three short first horizontal frames 2b5 between 2b1 and 2b4 are shifted to the rear to shift the center first horizontal frame 2b5 to the rear, but the present invention is not limited to this and is locked to the front half 2b side of the loading platform. The mechanism portion 8 may be provided and the short three second lateral frames 2a may be joined in steps, or the lock mechanism front portion 2b and the load carrier rear half portion 2a regardless of whether or not the lock mechanism portion 8 is provided. Of course, the second lateral frame may be configured not to be in a straight line but to be stepped.

DESCRIPTION OF SYMBOLS 1 Telescopic carriage 2 Loading platform 2a Loading platform second half 2a1-2a4 Vertical frame 2a5 First horizontal frame 2a6 Second horizontal frame 2a21, 2a22, 2a31, 2a32 Lock hole 2b Loading platform front half 2b1-2b4 Vertical frame 2b5 1st horizontal frame 2b6 2nd horizontal frame 2b24, 2b34 Lock pin entrance / exit hole 3 Handle 4 Rear wheel support part 5 Rear wheel 6 Front wheel support part 7 Front wheel 8 Lock mechanism part 81 First base part 82 Lock pin 83 Rotating plate 83a Rotating shaft 83b Connection arm 84 Spring 85 Operation part 85a Second base part 85b Operation lever 85c Connection rod 85d Head

In order to achieve the above object, an extendable transport cart according to the present invention includes a front bed and a rear wheel, a load bed on which a load can be placed on an upper surface, and a handle provided on a rear side of the load bed. The retractable transport cart is provided, and the loading platform is divided into a first half of the loading platform and a latter half of the loading platform, and the first half of the loading platform and the latter half of the loading platform are each perpendicular to the traveling direction. There are at least two longitudinal frames arranged in the transverse direction with a predetermined interval and extending in the traveling direction, and one longitudinal frame of the front half of the loading platform and the latter half of the loading platform is inserted into the other vertical frame. The length of the loading platform in the traveling direction can be adjusted, and the loading platform has a longitudinal frame in the latter half of the loading platform, the length of the loading platform at predetermined intervals in the traveling direction. Slide interval While a plurality of locking holes to be determined are formed, the vertical frame in the first half of the loading platform has a locking pin insertion / extraction hole for allowing the distal end of the locking pin to freely enter and exit, and the distal end of the locking pin The length of the loading platform in the traveling direction can be expanded and contracted by locking it with a predetermined length by projecting it from the lock pin entry / exit hole into one of the plurality of locking holes in the vertical frame in the latter half of the loading platform. And a first base portion that is provided between two longitudinal frames in the first half of the loading platform and supports the lock pin so as to be movable back and forth in the lateral direction. A rotation plate is provided on the base portion via a rotation shaft portion, and is connected to a rear end portion of the lock pin. The rotation plate moves the lock pin back and forth by the rotation, and one end rotates. One of the boards The other end is connected to a part of the first base part and the other part of the rotating plate, and the rotating plate is rotated against the spring to lock the lock. An operating portion for projecting the tip end portion of the pin from a lock pin entrance / exit hole of the vertical frame in the front half of the loading platform to any one of a plurality of locking holes of the vertical frame in the rear half of the loading platform. Is a second base portion provided between the two longitudinal frames of the first half of the loading platform and spaced apart from the first base by a predetermined distance forward, and the first half of the loading platform with respect to the second base portion The operation lever provided so as to be movable back and forth in parallel with the longitudinal direction of the two vertical frames, the rear end portion of the operation lever provided on the second base portion, and the rotating plate provided on the first base portion And a connecting rod for connecting a part of the second base portion The operating lever of the provided operating part is moved in the direction of the two vertical frames in the first half of the loading platform, and the rotating plate provided on the first base part is rotated against the elastic force of the spring via the connecting rod. The lock pin is moved back and forth in the horizontal direction so that it protrudes or retreats to any one of the plurality of lock holes of the vertical frame in the latter half of the load bed, and the load bed is locked at a predetermined length. Features.
Here, each of the first half of the loading platform and the second half of the loading platform has four vertical frames arranged at predetermined intervals in the lateral direction, and two on both sides of the first half of the loading platform and the latter half of the loading platform. In the vertical frame, the vertical frame in the first half of the loading platform is passed through the vertical frame in the latter half of the loading platform, while in the two vertical frames on the inside, the loading platform is placed in the vertical frame inside the first half of the loading platform. It is good to comprise so that it can expand-contract through the longitudinal direction frame of the latter half part.
The lock mechanism is provided in the first half of the cargo bed, and the second base part is provided on the back side of the first half of the cargo bed in the cargo bed. Is not projected outward from the loading platform, and is provided between the two vertical frames in the first half of the loading platform in a range where other fingers can reach while placing a finger or palm on the lateral frame on the front side of the first loading platform Even better.
In addition, at least one of the first half of the loading platform and the second half of the loading platform is joined between two or more vertical frames by two or more short horizontal frames extending in the horizontal direction. It is even better if the lateral frames are not aligned on a straight line but shifted in a stepwise manner.

In the telescopic transport cart according to the present invention, the loading platform is divided into a loading platform front half and a loading platform rear half, and one vertical frame of the loading platform front half and the loading platform rear half is the other longitudinal direction. Since it is configured to be able to extend and contract in the traveling direction by being inserted into the frame, and the length of the loading platform in the traveling direction can be adjusted, the length of the loading platform can be easily changed according to the size and amount of the load. be able to.
As a result, it is not necessary to have a plurality of carts with different sizes of loading platforms, and the cost can be reduced correspondingly, and a large storage space is not necessary.
Further, the first base portion and the second base portion constituting the lock mechanism portion are provided with a space between the two longitudinal frames in the first half of the loading platform, and the operation portion provided on the second base portion side is operated. The lever is moved in parallel with the longitudinal direction of the longitudinal frame so that the lever can be moved forward and backward to rotate the rotating plate provided on the first base part side via the connecting rod, thereby moving the lock pin back and forth in the lateral direction. The first base portion provided between the two vertical frames in the first half of the loading platform and the first loading portion for extending and contracting the loading platform by projecting into any one of the plurality of locking holes of the vertical frame in the second half portion. With the two base parts, the operation lever can be moved forward and backward in parallel with the longitudinal direction of the vertical frame with a small number of parts while improving the rigidity of the first half of the loading platform and can be easily locked.

Claims (7)

A telescopic transport cart provided with a front wheel and a rear wheel, and a cargo bed on which a load can be placed and traveled, and a handle provided on the rear side of the cargo bed,
The cargo bed is
It is divided into the first half of the loading platform and the latter half of the loading platform that are opposite to each other,
The first half of the loading platform and the second half of the loading platform each have a longitudinal frame that extends in the traveling direction by arranging at least two at a predetermined interval in the transverse direction perpendicular to the traveling direction. Extendable in the traveling direction by inserting one vertical frame in the other vertical frame, and the length of the loading platform in the traveling direction is adjustable. Carriage for transportation. The telescopic transport cart according to claim 1,
Each of the first half of the loading platform and the second half of the loading platform has four vertical frames arranged at predetermined intervals in the lateral direction,
In the two vertical frames on both sides of the first half of the loading platform and the second half of the loading platform, the vertical frame of the first half of the loading platform is passed through the vertical frame of the second loading platform, while the two vertical frames on the inside A telescopic transport cart characterized by being configured to extend and contract through a longitudinal frame in the latter half of the loading platform in a longitudinal frame inside the first half of the loading platform. The telescopic transport cart according to claim 1 or 2,
The cargo bed is
While one of the vertical frames of the front half of the loading platform and the latter half of the loading platform is formed with a plurality of lock holes for determining the sliding distance of the length of the loading platform at a predetermined interval in the traveling direction,
The other vertical frame of the first half of the loading platform and the second half of the loading platform is formed with a lock pin loading / unloading hole that allows the leading end of the locking pin to be freely loaded and unloaded, and the leading end of the locking pin is extended from the locking pin loading / unloading hole. The length of the loading platform in the traveling direction is expanded and contracted by projecting into one of the plurality of locking holes of the vertical frame of the first half of the loading platform and the second half of the loading platform, and at a predetermined length. A telescopic transport cart characterized by having a lock mechanism for locking. In the telescopic transport cart according to claim 3,
The locking mechanism is
A first base that is provided between the other two longitudinal frames of the front half of the carrier and the latter half of the carrier, and that supports the lock pin so as to be movable back and forth in the lateral direction;
A rotation plate provided on the first base portion so as to be rotatable via a rotation shaft portion, connected to a rear end portion of the lock pin, and moving the lock pin in a lateral direction by the rotation;
A spring connected to a part of the rotating plate;
Connected to the other part of the rotating plate, the rotating plate is rotated against the spring, and the tip of the lock pin enters and exits the lock pin of the other vertical frame of the front half and the rear half of the bed. An operation portion that projects from the hole into one of the plurality of lock holes of the longitudinal frame of the load carrier front half and the load carrier rear half,
A telescopic transport cart characterized by locking the loading platform at a predetermined length by operating the operation section. The telescopic transport cart according to claim 4,
The operation part of the locking mechanism part is
A second base portion provided between the other two longitudinal frames of the first half of the loading platform and the second half of the loading platform and spaced from the first base portion in either direction of the traveling direction;
An operation lever provided on the second base portion so as to freely advance and retract;
An extendable transport cart, comprising: a connecting rod that connects a rear end portion of an operation lever provided in the second base portion and a part of the rotating plate provided in the first base portion. The telescopic transport cart according to claim 5,
The lock mechanism is provided in the first half of the loading platform,
The second base portion is provided on the back side of the first half of the loading platform in the loading platform, and at least in the locked state, the operation lever head gripped by the operator at the tip side does not protrude outward from the loading platform, and the first half of the loading platform is A telescopic transport cart characterized by being provided between two longitudinal frames in the front half of a cargo bed in a range where other fingers can reach while placing a finger or palm on the front lateral frame. In the telescopic transport cart according to any one of claims 1 to 6,
At least one of the first half of the loading platform and the second half of the loading platform is joined between two or more vertical frames by two or more short horizontal frames extending in the horizontal direction, and the two or more horizontal directions. A telescopic transport cart characterized in that the frames are not aligned on a straight line but shifted in steps.

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