JP2013233881A - Six-wheel carrying truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a six-wheel truck having a floor pallet capable of rising/falling, in which a simplified mechanism to move up and down central wheels is provided for enabling stable travel even when the central wheels ground.SOLUTION: Between a first caster frame 20A and a second caster frame 20B with respective universal wheels 25, a third caster frame 20C with fixed wheels 28 are set in parallel. A basic frame 1 is formed by making a X-shape connection between a first basic frame 1A and a second basic frame 1B set in parallel via a connection pin 17 supported on the third caster frame 20C. The connection of one end of the first basic frame is made via a connection pin 15 supported on the first caster frame 20A, and the connection of the other end of the second basic frame 1B is made via a connection pin 15 supported on the second caster frame 20B. The central wheels 28 cannot ground when moved up in the state that a floor pallet 55 falls (b), and can ground when moved down in the state that the floor pallet 55 rises to keep both basic frames 1A, 1B in a X-shape (a).

Description

  The present invention is a six-wheeled truck in which three floor frames are connected by a basic frame. The six-wheeled truck is grounded for stable running, and the four wheels are grounded (the two wheels are ungrounded). The present invention relates to a 6-wheel transportation cart capable of realizing traveling suitable for small turns.

Conventionally, in a six-wheel transportation cart, the front and rear four wheels are configured using free casters, and the central two wheels are configured as fixed casters. Then, when traveling with a load on it, the two wheels of the central fixed caster and the front and rear free casters are combined and grounded so that the vehicle can travel straight ahead stably. In addition, when the load is not loaded, in order to cut and nest, the small fixed caster in the center is not grounded, and only the free casters in the front and rear are grounded, for traveling with a small turn.
In order to realize this, the front wheel (or the rear wheel) is moved up and down, and as a result, the grounding of the central fixed caster is adjusted (Patent Document 1). Moreover, the device which raises / lowers the wheel located in the center was also proposed (patent document 2).

JP-A-11-33406 JP2001-10501

Usually, in the free caster, the position of the axle and the vertical rotation shaft that changes the direction of the vertical wheel are eccentric, and the direction of the wheel is easily changed by the operator's pressing, so that the small turning is easy. However, in the conventional former six-wheel carriage, when the front wheel protrudes downward, the vertical rotation axis of the front and rear free casters is not perpendicular to the ground, so the positions of the ground and the casters There is a problem that it becomes difficult to operate the cart depending on (the position of the vertical rotation axis).
Further, in order to solve the problem of eccentricity, there is a problem that the mechanism becomes complicated when the wheel located in the center is operated as in the latter prior art.

  Therefore, in the present invention, since the basic frame is composed of two parallel frames and is fixed to the shaft at the intermediate portion, it is possible to reliably perform a small turning operation and simplify the mechanism for raising and lowering the wheel, and Solved.

That is, according to the present invention, casters are attached to both end portions of the lower surface as caster frames, and the first caster frame, the second caster frame, and the third caster frame are juxtaposed in parallel and arranged at one end of the basic frame arranged in a substantially horizontal direction. A caster frame, a second caster frame at the other end, a third caster frame at the middle, and a floor pallet placed substantially horizontally on the basic frame are configured as follows. This is a 6-wheel truck.
(1) The basic frame includes a first basic frame and a second basic frame arranged in parallel in a horizontal direction.
One end of the first basic frame is attached to the upper surface of the first caster frame so as to be relatively movable around a substantially horizontal axis;
The other end of the second basic frame is attached to the upper surface of the second caster frame so as to be relatively movable around a substantially horizontal axis,
The first basic frame and the second basic frame are rotatably connected by a substantially horizontal pin at an intermediate portion.
(2) The other end of the first basic frame is biased by springs and is in an “upward position”, and the other end of the first basic frame is pressed against the springs. Is provided with an operating means for operating to the “lower position”.
(3) The caster frames were disposed so as to satisfy the following conditions, and wheels were fixed to the caster frames.
(a) A line connecting the lower end position of the wheel of the caster wheel of the first caster frame and the lower end position of the wheel of the caster wheel of the second caster frame is defined as a “ground reference line”.
(b) When the other end of the first basic frame is in the “downward position”, the lower end of the wheel of the caster wheel of the third caster frame is positioned below the ground reference line.
(c) When the other end portion of the first basic frame is in the “upward position”, the lower end of the wheel of the caster wheel of the third caster frame is positioned above the ground reference line.

Moreover, in the above, it is a 6-wheel conveyance trolley | bogie characterized by being comprised as follows.
(1) The floor pallet arranged substantially horizontally is placed on the first second basic frame, the first second third caster frame, and the base end of the floor pallet can be raised and lowered on the first caster frame side. Install so that it becomes.
(2) The base end of the floor pallet is attached to the first caster frame or an accessory attached to the first caster frame via a horizontal axis, and the floor pallet is rotated around the horizontal axis to undulate. It is formed to be free.
(3) A gap is formed between the lower surface of each basic frame and the upper surface of each caster frame.

Moreover, in the above, it is a 6-wheel conveyance trolley | bogie characterized by being comprised as follows.
(1) A substantially horizontal pin is disposed at a substantially central portion of the first and second basic frames.
(2) Arrange each caster frame at almost the same interval.
“The pin is supported by a support plate protruding on the third caster frame” or “the vicinity of the pin of the first basic frame or the vicinity of the pin of the second basic frame is mounted on the third caster frame. "
(3) A first side panel is detachably attached to the upper surface of the first frame, and a second side panel is detachably attached to the upper surface of the second frame.

Furthermore, in the above, the present invention is a six-wheel transport cart characterized by being configured as follows.
(1) A basic frame is configured by arranging a first basic frame and a second basic frame in parallel with a predetermined gap therebetween.
(2) A stopper for restricting the rotation of the wheel of the third caster frame is provided, a wheel operating rod for operating the stopper is disposed in the gap, one end of the wheel operating rod is attached to the stopper, The other end is connected to wheel operating means provided on the first caster frame or the second caster frame.

  The attachment of the end portion of the first second basic frame and the caster frame in the above-described manner is because the central portion of the first second basic frame is rotatably connected by a horizontal pin. Since the second basic frame is formed in a substantially X shape and the end portion rotates in an arc shape, it is only necessary to allow relative movement at the end portion. Therefore, it is only necessary to be able to move in an arc shape, but it is intended to allow movement in the vertical and horizontal directions with a margin.

  In the present invention, the basic frame for connecting each caster frame is divided into two in the horizontal direction, and the intermediate part is connected with pins as the first basic frame and the second basic frame, and the third caster frame is provided in the intermediate part Therefore, the third caster frame can be lifted and lowered efficiently with a small number of members without greatly tilting the basic frame. Accordingly, if the first caster frame and the second caster frame on both sides are used as free wheels and the third caster frame is a fixed wheel, a six-wheeled cart with high functionality can be configured.

FIG. 1 shows a state where a floor pallet is raised in a transport cart according to an embodiment of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is a right side view. FIGS. 2A and 2B show a transport cart according to an embodiment of the present invention, in which the floor pallet is turned down, where FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a right side view. FIGS. 3A and 3B are perspective views of the transportation carriage according to the present invention. FIG. 3A shows a state where the floor pallet is raised, and FIG. 3B shows a state where the floor pallet is turned down. 4A and 4B show a front view of the transportation cart according to the present invention in which the periphery of the caster frame is partially broken. FIG. 4A shows a state immediately before the floor pallet is turned down, and FIG. 4B shows a state where the floor pallet has begun to turn down. , Respectively. FIGS. 5A and 5B are perspective views of the transporting carriage according to the present invention, in which FIG. 5A shows a state immediately before the floor pallet is turned down, and FIG. 5B shows a state where the floor pallet has begun to turn down. FIG. 6 is an enlarged front view of the periphery of the first caster frame. (A) is a state where the floor pallet is attached (first position), (b) is a state immediately before the floor pallet is turned down, and (c) is a state where the floor pallet is placed. A state where the floor pallet starts to be bent (second position) and a state where the floor pallet is raised (second position) are shown. 6A and 6B are enlarged front views of the basic frame and the caster frame. FIG. 6A shows a state where the rotation of the wheels of the third caster is restricted, and FIG. 6B shows a state where the rotation is similarly released. FIG. 8 is a perspective view of the transportation carriage of the present invention, where (a) shows a state where a floor pallet is raised by one transportation carriage, and (b) shows a state where four transportation carriages are nested. Represent.

1. Basic frame 1

(1) The basic frame 1 is a frame that connects the caster frames 20A, 20B, and 20C so as to maintain a predetermined position.

(2) substantially the same length, the two first basic frame 1A of the same cross-sectional shape (vertical rectangle) and a second base frame 1B with a predetermined gap L _2, arranged in parallel, a basic frame 1 (FIG. 1A).
The first basic frame 1A and the second basic frame 1B are formed with a lateral (substantially horizontal) through-hole 4 in the base end 3 and a downwardly projecting portion 5 at the distal end 3a. A long hole 6 is formed in the protruding portion 5 in the vertical direction (a circular arc convex outward). Further, a lateral (substantially horizontal) through-hole 7 is formed at a substantially central portion at an intermediate portion between the distal end portion 3a and the base end portion 3 in the length direction.

(3) The inverted L-shaped operating tool 10 including the horizontal piece 11 and the vertical piece 12 is formed. At the protrusion 5 of the second basic frame 1B, the horizontal piece 11 of the inverted L-shaped operating tool 10 is arranged above the long hole 6, and the vertical piece 12 is arranged along the edge on the tip side of the long hole 6. . A horizontal pin 13 is provided at an intermediate portion of the horizontal piece 11 and slightly proximal to the shaft of the long hole 6, and the horizontal piece 11 is rotatably attached to the protruding portion 6. The front end 12 a of the vertical piece 12 is located above the lower end of the long hole 6.
At the first position of the operating tool 10, the horizontal piece 11 of the operating tool 10 is located along the upper surface 8a of the second basic frame 1B, does not protrude from the upper surface 8b, and does not hook into the long hole 6 (do not fog). ). At this time, the vertical piece 12 is located along the distal end side of the long hole 6, does not hang over the long hole 6, and does not protrude from the distal end 3 c of the second basic frame 1 B (FIG. 6A )).
At the second position of the operating tool 10, the operating tool 10 rotates around the horizontal pin 13, and the tip 11a of the horizontal piece 11 protrudes upward from the upper surface 8b of the second basic frame 1B. Further, the lower end portion 12a of the vertical piece 12 closes the long hole 6, and the lower edge of the oblique vertical piece 12 is in a horizontal state, and the lower edge of the vertical piece 12 is positioned above the lower edge of the long hole 6. (FIGS. 6C and 6D).
Further, the operating tool 10 does not always protrude from the tip 3c of the second basic frame 1B while moving between the first position, the second position, and the first position and the second position. Further, the operating tool 10 sets the shape and the position of the horizontal pin 13 so as to be in the second position under its own weight in a state where no external force is applied (FIG. 6D).

2. Caster frame 20

(1) Casters 24 and 24 are fixed to both end portions of the bottom surface of a horizontally long rectangular base plate having a length L ₁ and a width D ₁ to constitute a first caster frame 20A. Further, a support tube 23 for fixing casters 24, 24 to both ends of the bottom surface of a horizontally long rectangular base plate having a length L ₁ and a width D ₁ and standing a side panel 40 at the center on the upper surface 21. The second caster frame 20B is configured by protruding. The casters 24 of the two caster frames are formed by shifting a substantially horizontal axle 25a of the wheel 25 and a vertical turning shaft 26 that rotates the wheel 25 in a horizontal plane (FIG. 1A). b)).

(2) The casters 27 and 27 are fixed to both ends of the bottom surface of the horizontally long rectangular base plate having the length L ₁ and the width D ₁ to constitute the third caster frame 20C. The caster 27 of the third caster frame 20C is set so that the axle 28a of the wheel 28 does not rotate in a horizontal plane, and is a fixed caster (FIGS. 1A and 1B).
A sprocket 29 that is coaxial with the wheel 28 of the third caster plate 20C and has irregularities formed on the outer periphery of the disk is fixed, and the outer peripheral edge of the sprocket 29 is formed to be sufficiently smaller than the outer periphery of the wheel 28. The caster plate of the third caster frame 20 </ b> C is provided with a stopper 31 that moves toward the axle 28 a and is inserted into the unevenness of the sprocket 29 to restrict the rotation of the sprocket 29 (= the rotation of the wheels 28). Moreover, if the stopper 31 moves away from the axle 28 (radially) to release the insertion from the sprocket, the sprocket 29 can be freely rotated (FIGS. 7A and 7B). .

(3) first caster frame 20A, the upper surface 21 of the second caster frame 20B, the support cylinder 23 to project fixed width _{D 1} direction substantially central portion. The support tube 23 is a member for receiving the support post 46 of the side panel 40, provided Intention to one side in the length L ₁ direction. In addition, on the upper surface 21 of the first caster frame 1A and the second caster frame 1B, the first holding plate 33A and the second holding plate 33B for supporting the basic frame 1 are erected and fixed to the other side of the support cylinder 23, respectively. (FIG. 1 (a), FIG. 7).
Further, the third holding plate 33C is fixed upright on the upper surface 21 of the third caster frame 20C. The first holding plate 33A, the second holding plate 33B, and the third holding plate 33C are arranged in the same direction.

(4) The operation pedal 35 and the release pedal 36 for operating the stopper 31 of the third caster frame 20C are attached to the upper surface 21 of the second caster frame 20B.

(5) In each of the caster frames 20A, 20B, and 20C, the base plate has a reinforcing rib formed by bending the periphery of the plate material downward. However, the configuration is arbitrary as long as the casters 27 and 28 can be fixed. It is.

3. Side panel 40

(1) The pipe is bent and directed downward toward the lower end of the panel main body 45 formed by installing the crosspieces 43 and 43 on the gate-shaped frame member composed of the vertical member 41, the horizontal member 42, and the vertical member 41. A support column 46 protruding in this manner is provided as a side panel 40 (FIGS. 1 to 3).

(2) At the lower end of the panel body 45, there are support cross members 44, 44 to which the support pillars 46 are directly connected. Further, the vertical member 41 on one side of the panel body 45 extends downward in parallel with the support column 46 to form an auxiliary column member 47. There is no auxiliary column material 47 in the vertical member 41 on the other side of the auxiliary column material 47, and a space 48 is formed between the upper surface 21 of the caster frame 20 that is to be attached to the mounting hole. The basic frame 1 of another carriage can pass through the space 48 (FIGS. 3 and 8).

4). Configuration of the carriage 60

(1) The floor frame 38 is configured by combining the basic frames 1A, 1B and the caster frames 20A, 20B, 20C (FIG. 7).

(2) first caster frame 20A, at predetermined intervals the third caster frame 20C and the second caster frame 20B in this order, arranged in a length _{L 1} direction.
The first basic frame 1A and the second basic frame 1B are juxtaposed so that the base end portion 3 of the first basic frame 1A and the distal end portion 3a of the second basic frame 1B overlap in the lateral direction, and the first caster frame 20A The first holding plate 33A is disposed so as to sandwich the first holding plate 33A. The lateral (substantially horizontal) connecting pin 15 inserted through the through hole of the first holding plate 33A is connected to the through hole 4 of the base end portion 3 of the first basic frame 1A and the length of the distal end portion 3a of the second basic frame 1B. It is inserted into the hole 6 and connected so as to be rotatable and movable vertically and horizontally.
Similarly, the front end portion 3a of the first basic frame 1A and the base end portion 3 of the second basic frame 1B arranged in parallel are arranged so as to sandwich the second holding plate 33B of the second caster frame 20B. The connecting pin 15 in the lateral direction (substantially horizontal) inserted through the through hole of the second holding plate 33B is passed through the long hole 6 of the distal end portion 3a of the first basic frame 1A and the base end portion 3 of the second basic frame 1B. It is inserted into the hole 4 and connected so as to be rotatable and movable vertically and horizontally.
Further, in this state, the central portion of the first basic frame 1A and the second base frame 1B, since holes 7, 7 are communicated, third caster frame gap 9 of width L ₂ of both basic frame 1A, 1B The third holding plate 33C of 20C is inserted and communicated with the through holes 7 and 7 of the third holding plate 33C, and the three through holes are rotatably connected by the connecting pins 17 (see FIG. 6).
Therefore, the first basic frame 1 </ b> A and the second basic frame 1 </ b> B are connected in an X shape by the connecting pin 17 and are rotatable around the connecting pin 17. Therefore, as described above, the long holes 6 at both ends of the first basic frame 1A and the second basic frame 1B include an arc shape or a locus that protrudes outward along the locus of rotation of both ends. It is formed in a large vertically long shape.

(3) The spring 51 that presses the vicinity of the lower edge of the protruding portion 5 of the tip portion 3a of the second basic frame 1B upward is fixed to the first caster frame 20A (FIGS. 1B and 6).

(4) In this state, the first second third caster frame 20A, 20B, the upper surface 21 of the 20C and the first second basic frame 1A, between the lower surface 8a of 1B, the gap height _{H 1} is formed (FIG. 1 (b). Therefore, when the two carriages are arranged, the first, second and third caster frames 20A, 20B, and 20C of one carriage are connected to the other carriage. It can pass under the lower surface 8a of the first and second basic frames 1A and 1B.

(5) A wheel operating rod group 53 is disposed between the second caster frame 20B and the third caster frame 20C in the gap 9 between the first basic frame 1A and the second basic frame 1B (FIG. 1 (a), FIG. 7). One end of the wheel operation rod group 53 is connected to the operation pedal 35 and the release pedal 36 provided on the upper surface 21 of the second caster frame 20B, and the other end of the wheel operation rod group 53 is connected to the stopper 31 of the third caster frame 20C. (FIG. 7).
Normally, the operation pedal 35 is in the raised position, the stopper 31 is also away from the axle 28a, and the wheels 28 of the third caster frame 20C are freely rotatable (FIG. 7B). When the operation pedal 35 is depressed (pressed downward), the stopper 31 is operated and moved toward the axle 28a by the linear movement and rotational movement of the wheel operation rod group 53, and the stopper 31 is locked to the sprocket 29 and the wheel. 28 is restricted (FIG. 7B). Further, the operation pedal 35 holds the depressed position and holds the operation of the stopper 31.
When the release pedal 36 is depressed, the operation pedal 35 returns to its original state (always) by a spring (not shown), the wheel operation rod group 53 and the stopper 31 also return to their original positions, and the operation of the stopper 31 is also released. The wheel 28 can freely rotate (FIG. 7A).

(6) Subsequently, the first side panel 40A and the second side panel 20B are inserted into the support cylinders 23 and 23 of the first caster frame 20A and the second caster frame 20B, respectively. At this time, the auxiliary column members 47 of the side panels 40A and 40B are fitted into the recesses formed in the caster frames 20A and 20B. Further, the space 48 on the other side of the auxiliary column member 47 in each side panel 40A, 40B is the second basic frame side in the first caster panel 20A, and the first basic frame 1A side in the second caster frame 20B (operation It is located on the opposite side of the pedal 35.

(7) Further, the rotating shaft 58 of the base end portion 56 of the floor pallet 55 is supported on the lateral support member 44 of the first side panel 40A on the first caster frame 20A side. In the floor pallet 55, the front end portion 57 is positioned on the second caster frame 20B, the base end portion 56 is positioned on the first caster frame 20A, and the first second basic frames 1A, 1B, The three caster frames 20C are arranged in the horizontal direction so as to cover them. Further, the floor pallet 55 is vertically arranged along the inside of the first side panel 40A on the first caster frame 20A side in the raised state, and the front end portion 56 of the floor pallet 55 is placed on the upper end portion of the first side panel 20A. It is locked and the state can be maintained (FIG. 1, FIG. 3 (a)).

(8) When the basic movement of the transport carriage 60 is outlined, the first basic frame 1A and the second basic frame 1B coincide with each other with the floor pallet 55 turned down. The lower edge of the wheel 28 is located above the ground reference line 62 and cannot be grounded (FIGS. 1 and 3 (a)). With the floor pallet 55 raised, the first basic frame 1A and Since the second basic frame 1B is slightly rotated around the connecting pin 17 to form an X shape, the lower edge of the wheel 28 of the central caster 27 is positioned below the ground reference line 62 and can be grounded. (FIG. 2, FIG.3 (b)).

5. About the use of transportation carts

(1) In the cargo transporting state, the floor pallet 55 is attached, and the first and second basic frames 1A and 1B are substantially parallel to the horizontal direction (FIGS. 2 and 3B). In this state, the ground reference line 62 connecting the lower edge (grounding position) of the wheel 25 of the first caster frame 20A and the lower edge (grounding position) of the second caster frame 20B is the wheel 28 of the third caster frame 20C. It is located above the lower edge (grounding position) (FIG. 2B).
Accordingly, during traveling, the wheel 28 of the third caster frame 20C is always grounded, and either the wheel 25 of the first caster frame 20A or the wheel 25 of the second caster frame 20B is grounded. Since the non-turning wheel 28 is grounded, it is possible to travel with excellent straightness in the direction indicated by arrow 64 (FIG. 2 (a)), and since the turning wheel 25 is also grounded, there is no hindrance to turning.
Further, in this state, the lower surface of the base end portion 56 of the floor pallet 55 presses the distal end portion 3b of the second basic frame 1B against the spring 51, so that the movement of the horizontal piece 11 of the operation tool 10 is restricted. (FIG. 6A). In this state, the connecting pin 15 (the through hole 4 of the first basic frame 1A) is located at the upper end of the long hole 6 (FIG. 6A).
Further, in this state, when the operation pedal 35 is depressed by the second caster frame 20B, the stopper 31 is operated to make the wheels 28 non-rotatable and the transport cart 60 stopped can be held. Further, when the release pedal 36 is depressed, the operation of the stopper 31 is released, the operation pedal 35 is also returned to the original position, and the rotation of the wheel 28 can be maintained.

(2) Further, even when the luggage is not transported, the operation tool 10 is pressed by the weight of the floor pallet 55 with the floor pallet 55 attached (FIGS. 2 and 3B), and this position (FIG. The strength of the spring 51 is adjusted so that 6 (a)) can be maintained.

(3) Moreover, when not using the conveyance trolley | bogie 60, a floor pallet is raised and it locks along the inner side of 40 A of 1st side panels (FIG. 1, FIG. 3 (a)). In this state, the first and second basic frames 1A and 1B are slightly rotated around the through hole 7 in the intermediate portion to form an X shape (FIGS. 1 and 3A). In this state, the ground reference line 62 connecting the lower edge (grounding position) of the wheel 25 of the first caster frame 20A and the lower edge (grounding position) of the second caster frame 20B is connected to the third caster frame 20C. It is located below the lower edge (grounding position) of the wheel 28 (FIG. 1B).
Accordingly, during traveling, the wheel 25 of the first caster frame 20A and the wheel 25 of the second caster frame 20B are always grounded, and the wheel 28 of the third caster frame 20C is not grounded. Therefore, since the wheel 28 that does not turn does not touch the ground and only the wheels 25 and 25 that can turn freely touch the ground, not only the traveling in the direction indicated by arrow 64 but also the traveling in the direction perpendicular to this (direction indicated by arrow 65) is free. (FIG. 1A). Therefore, when nesting a plurality of transport carts 60 (FIG. 8A) that have raised the floor pallet 55, and when releasing the nesting, the work efficiency can be increased (FIG. 8B).

(4) From the state where the floor pallet 55 is turned down (FIGS. 2, 3B) to the state where the floor pallet 55 is raised (FIGS. 1, 3A), the operation of the operation tool 10 This will be described (FIG. 6).
First, in the state where the floor pallet 55 is attached as described above, the lower surface of the base end portion 56 of the floor pallet 55 presses the distal end portion 3b of the second basic frame 1B against the spring 51, and the operation tool 10 The horizontal piece 11 cannot be moved (FIG. 6A), and the connecting pin 15 (the through hole 4 of the first basic frame 1A) is located at the upper end of the long hole 6 (FIG. 6A).

Next, when the floor pallet 55 is slightly raised (FIGS. 4A and 5A), the tip of the second basic frame 1B is moved by the spring 51 as the lower surface of the base end portion 56 of the floor pallet 55 rises. The part 3a (protruding part 5) is also raised, and the connecting pin 15 (the through hole 4 of the base end part 3 of the first basic frame 1A) is located in the middle part of the long hole 6 (FIG. 6B). In this state, since the connecting pin 15 is still located in the middle portion of the long hole 6, the lower surface of the base end portion 56 of the floor pallet 55 is the upper surface of the distal end portion 3a of the second basic frame 1B (horizontal of the operation tool 10). Since the piece 11) is pressed, the operation tool 10 cannot rotate.
Further, when the floor pallet 55 is raised (FIGS. 4B and 5B), the tip 51a of the second basic frame 1B is moved by the spring 51 as the bottom surface of the base end 56 of the floor pallet 55 rises. Although the (protrusion part 5) also rises, the connecting pin 15 (the through hole 4 of the base end part 3 of the first basic frame 1A) is located at the lower end of the long hole 6 (FIG. 6C). Accordingly, the distal end portion 3a (projecting portion 5) of the second basic frame 1B cannot be raised any more, and as the bottom surface of the base end portion 56 of the floor pallet 55 rises, the bottom surface of the base end portion 56 of the floor pallet 55 becomes The operation tool 10 cannot be pressed, and the operation tool 10 starts to rotate around the horizontal pin 13. The upper end 11a of the horizontal piece 11 protrudes above the upper surface 8b of the second basic frame 1B, the lower edge 12a of the vertical piece 12 becomes substantially horizontal, closes the long hole 6, and is positioned above the connecting pin 15. (FIGS. 6C and 6D).
In this state, the distal end portion 5 of the second basic frame 1B is pressed by the spring 51 on the lower surface side, so that the connecting pin 15 is relatively pressed downward on the lower edge of the long hole 6. Unless a large external force against the spring 51 is applied, this state (FIG. 6D) is maintained. Further, the operating tool 10 is in its own weight and is in the state of FIG. 6D, and the lower edge 12 a is not in contact with the connecting pin 15, so that the operating tool 10 can freely rotate around the horizontal pin 13. It has become.
Conversely, in order to move the first basic frame 1A and the second basic frame 1B from this state, the operating tool 10 is rotated around the horizontal pin 13 so that the lower edge 12a of the vertical piece 12 is located above the connecting pin 15. Further, the front end portion 5 of the second basic frame 1B must be pressed downward against the spring 51. Therefore, the transport carriage 60 can safely maintain this state. In this state, the tip 11a of the horizontal piece 11 of the operation tool 10 protrudes upward from the upper surface 8b of the second basic frame 1B. The structure (shape) of the operation tool 10 is as small as possible. ) Has been adjusted.

(5) Subsequently, when the floor pallet 55 is raised (FIGS. 1 and 3A), the floor pallet 55 is returned to the lying state (FIGS. 2 and 3B). The operation will be described (FIG. 6).
If the floor pallet 55 is gradually laid down ((FIG. 4B, FIG. 5B)), the lower surface of the base end portion 56 of the floor pallet 55 is the tip 11a of the horizontal piece 11 of the operation tool 10 (second basic Since the operation tool 10 rotates around the horizontal pin 13, the lower end 12 a of the vertical piece 12 is connected to the connecting pin 15 (see FIG. 6C). 6 (b)), the lower surface of the base end portion 56 of the floor pallet 55 is at the same time the upper surface of the distal end portion 5 of the second basic frame 1b. Is pressed against the spring 51 so that the connecting pin 15 relatively moves up in the long hole 6 and moves around the connecting pin 17 so that the first and second basic frames 1A and 1B close the X shape. To do.
If the floor pallet 55 is turned down (FIGS. 2 and 3B), the first and second basic frames 1A and 1B are arranged in parallel in the horizontal direction so that the heights of the upper surfaces thereof are substantially matched. Return to the position (FIG. 6A).

6). About other examples

(1) In the above embodiment, the operation pedal 35 and the release pedal 36 are provided on the second caster frame 20B side, but are formed on the first caster frame 20A side, and the wheel operation rod group 53 is connected to the first caster frame 20A. It can also be provided between the third caster frames 20C. Further, the mechanism for restricting the rotation of the wheels 28 of the third caster frame is not limited to the above contents (not shown). Further, a mechanism for restricting the rotation of the wheels 28 of the third caster frame can be omitted (not shown).

(2) Moreover, in the said embodiment, the front-end | tip part 3a side of 1 A of 1st basic frames can also be abbreviate | omitted (not shown). That is, the first basic frame 1A may be formed short and have a length from the base end part 3 to the through hole 7 in the intermediate part.

(3) Moreover, in the said embodiment, although the operation tool 10 was operated automatically linked with the raising / lowering rotation of the floor pallet 55, it can also be operated manually (not shown). In this case, the strength of the spring 51 is adjusted.

(4) Moreover, in the said embodiment, although the operation tool 10 was provided in the front-end | tip part 3a (projection part 5) of the 2nd basic frame 1B, it can also be provided in the 1st caster frame 20A side (not shown). ).

  The operating tool 10 can also be provided at the tip 3a (projecting part 5) of the first basic frame 1A (not shown).

(5) In the above embodiment, the operation tool 10 can freely rotate around the horizontal pin 13 with the floor pallet 55 raised (FIGS. 1, 3 (a), 6 (d)). However, in this state, the operation tool 10 can be urged so that the lower end 12a of the vertical piece 12 of the operation tool 10 is always positioned above the connecting pin 15 (not shown).

DESCRIPTION OF SYMBOLS 1 Basic frame 1A 1st basic frame 1B 2nd basic frame 3 The base end part 3a of the 1st (2nd) basic frame The front-end | tip part 4 of a 1st (2nd) basic frame 5 The hole 5 of a base end part Projection of a front-end | tip part Part 6 Long hole 7 in the projecting part Middle hole 8a Lower surface 8b of the first (second) basic frame Upper surface 10 of the first (second) basic frame 10 Operation tool 11 Horizontal piece 12 of the operation tool Vertical piece of the operation tool 13 Horizontal pin (rotary axis of operation tool)
15 Connecting pin (both ends)
17 Connecting pin (central part)
20A first caster frame 20B first caster frame 20C first caster frame 21 upper surface 21a of each caster frame lower surface 23 of each caster frame support cylinder 24 caster (first second caster frame)
25 wheels (first and second caster frames)
25a axle (first and second caster frame)
26 Rotating shaft (first and second caster frame)
27 Caster (3rd caster frame)
28 wheels (3rd caster frame)
28a axle (third caster frame)
29 Sprocket (3rd caster frame)
31 Stopper (3rd caster frame)
33 Retaining plate (each caster frame)
35 Operation pedal (wheel operation means)
36 Release pedal (wheel operation means)
38 Floor frame 40A First side panel 40B Second side panel 45 Panel body (side panel)
46 Support pillar (side panel)
47 Auxiliary pillar material (side panel)
48 Space portion 51 Spring 53 Wheel operation rod group 55 Floor pallet 56 Floor pallet base end 57 Floor pallet tip 58 Floor pallet rotation shaft 60 Carriage carriage 62 Ground reference line

Claims (4)

A caster frame is attached to both ends of the lower surface, and a first caster frame, a second caster frame, and a third caster frame are arranged in parallel as caster frames.
A first caster frame is attached to one end portion of a basic frame arranged in a substantially horizontal direction, a second caster frame is attached to the other end portion, and a third caster frame is attached to an intermediate portion,
A six-wheeled transport carriage characterized in that a floor pallet is placed substantially horizontally on the basic frame and configured as follows.
(1) The basic frame includes a first basic frame and a second basic frame arranged in parallel in a horizontal direction.
One end of the first basic frame is attached to the upper surface of the first caster frame so as to be relatively movable around a substantially horizontal axis;
The other end of the second basic frame is attached to the upper surface of the second caster frame so as to be relatively movable around a substantially horizontal axis,
The first basic frame and the second basic frame are rotatably connected by a substantially horizontal pin at an intermediate portion.
(2) The other end of the first basic frame is biased by springs and is in an “upward position”, and the other end of the first basic frame is pressed against the springs. Is provided with an operating means for operating to the “lower position”.
(3) The caster frames were disposed so as to satisfy the following conditions, and wheels were fixed to the caster frames.
(a) A line connecting the lower end position of the wheel of the caster wheel of the first caster frame and the lower end position of the wheel of the caster wheel of the second caster frame is defined as a “ground reference line”.
(b) When the other end of the first basic frame is in the “downward position”, the lower end of the wheel of the caster wheel of the third caster frame is positioned below the ground reference line.
(c) When the other end portion of the first basic frame is in the “upward position”, the lower end of the wheel of the caster wheel of the third caster frame is positioned above the ground reference line. The six-wheeled carriage according to claim 1, wherein the carriage is configured as follows.
(1) The floor pallet arranged substantially horizontally is placed on the first second basic frame, the first second third caster frame, and the base end of the floor pallet can be raised and lowered on the first caster frame side. Install so that it becomes.
(2) The base end of the floor pallet is attached to the first caster frame or an accessory attached to the first caster frame via a horizontal axis, and the floor pallet is rotated around the horizontal axis to undulate. It is formed to be free.
(3) A gap is formed between the lower surface of each basic frame and the upper surface of each caster frame. The six-wheeled carriage according to claim 1, wherein the carriage is configured as follows.
(1) A substantially horizontal pin is disposed at a substantially central portion of the first and second basic frames.
(2) Arrange each caster frame at almost the same interval.
“The pin is supported by a support plate protruding on the third caster frame” or “the vicinity of the pin of the first basic frame or the vicinity of the pin of the second basic frame is mounted on the third caster frame. "
(3) A first side panel is detachably attached to the upper surface of the first frame, and a second side panel is detachably attached to the upper surface of the second frame. The six-wheeled carriage according to claim 1, wherein the carriage is configured as follows.
(1) A basic frame is configured by arranging a first basic frame and a second basic frame in parallel with a predetermined gap therebetween.
(2) A stopper for restricting the rotation of the wheel of the third caster frame is provided, a wheel operating rod for operating the stopper is disposed in the gap, one end of the wheel operating rod is attached to the stopper, The other end is connected to wheel operating means provided on the first caster frame or the second caster frame.

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