JP3823067B2 - Carry cart - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a carry cart that is used when transporting, displaying, and storing merchandise in a large store or the like and that can be nested when not in use.
[0002]
[Prior art]
Conventionally, a carry cart described in JP-A-11-334602 is known. In this carry cart, a single base plate is placed on an H-shaped cart frame, and when nesting is performed, the base plate stands in a vertical state with one end in the longitudinal direction (front-rear direction) as a fulcrum. The lower caster on the fulcrum side is pushed down by the action of the lever, and the fixed caster is lifted from the floor by lowering the free caster, and the carry cart is moved sideways (left and right) using the front and rear free casters. Is also movable and allows nesting.
[0003]
[Problems to be solved by the invention]
However, according to the conventional carry cart, since only one of the front and rear free casters is lowered, the cart frame when the front and rear free casters are grounded to the floor is in a state parallel to the floor until then. In spite of being, it becomes an inclined state. For this reason, nesting is impossible unless the tilting states of the carriage frames of all the carry carts are matched, and there has been a problem that a complicated operation is required in consideration of the direction of the carry cart in the front-rear direction.
[0004]
In addition, since only one of the front and rear free casters is lowered, it is necessary to set the lowering stroke amount of the free caster to a large value, and the mechanism for lowering the free caster is relatively complicated. There's a problem. In addition, since one base plate is in an upright state, when moving multiple nested carts to a storage location, the upright base plate hinders visibility and makes it difficult to see the front. There is also.
[0005]
The present invention solves the above-mentioned problems of the prior art, eliminates the need to consider the direction of the carry cart in the front-rear direction during nesting work, and provides a carry cart that can halve the downward stroke amount of the free caster. The main purpose is to provide. The present invention can be applied to all carry carts that can be nested, and is not limited to carry carts having an H-shaped carriage frame as described above.
[0006]
[Means for Solving the Problems]
The carry cart according to claim 1 includes a cart frame having a nestable shape, a fixed caster mounted on a bottom surface of a substantially central portion in the front-rear direction of the cart frame, a bottom surface of the front end portion and a bottom surface of the rear end portion of the cart frame. In addition, a free caster mounted via a free caster elevating mechanism, a swivel-mounted base plate that can be raised and lowered on the carriage frame, and is divided into two in the front-rear direction, and 1 for each base plate When the base plate is erected, the rotary shaft itself is lowered while rotating the rotary shaft of the base plate, and the free caster is lowered in conjunction with the downward movement of the rotary shaft. when for lodging the, while rotating the rotary shaft of the base plate to increase the rotating shaft itself, the universal caster lifting mechanism for raising a universal caster in conjunction with the rise of the rotating shaft Includes a case wherein two base plates of the inclined state, a state in which the fixed casters are grounded at all times the floor, also the two base plates when the standing state, each of the free casters are grounded at all times the floor Ri Do state fixed casters floats from the floor by, and, wherein said carriage frame is configured to be kept in parallel to the floor surface.
[0007]
According to the carry cart according to claim 1, the base plate is divided into two in the front-rear direction (longitudinal direction), and when each base plate is erected, the free caster descends and the fixed caster comes off the floor surface. Since it is in a floating state, the cart frame can be kept parallel to the floor even when the base plate is upright, and nesting can be performed without considering the longitudinal direction of the carry cart. Nesting work becomes very easy. Moreover, the downward stroke amount of the free caster is half of the conventional one. In addition, since the base plate is divided into two, the height (height) of the stand-up base plate is half that of the conventional one. Therefore, when moving multiple nested carts to a storage location, etc. The base plate does not obstruct the field of vision and makes it easier to see the front.
[0008]
According to a second aspect of the present invention, there is provided the carry cart according to the first aspect, wherein the universal caster elevating mechanism is provided on a vertical cylindrical portion provided on the cart frame side and a universal caster holding member that holds the universal caster, and the vertical cylinder is provided. An elevating part housed in the vertical cylindrical part so as to be movable only in the vertical direction while being guided by the inner wall surface of the shaped part, a horizontal elevating shaft part protruding from the side wall part of the elevating part, and a side wall of the vertical cylindrical part Formed in a portion, and a vertically long slot through which the horizontal elevating shaft portion is inserted, a horizontal fixed shaft portion provided in a side wall portion of the vertical cylindrical portion, and positioned immediately above the elongated hole, A rotation shaft portion rotatably fitted on a horizontal lifting shaft portion, and a rotation arm having a bending plate portion provided between the rotation shaft portion and the base plate, the bending plate portion being , Extending horizontally from the rotating shaft A flat portion, a curved portion bent at a substantially right angle downward from the horizontal portion, a vertical portion extending vertically from the curved portion, and a base plate mounting portion extending horizontally from the vertical portion and attached to the lower surface of the base plate has the door, when erecting the base plate, wherein the horizontal portion of the curved plate portion is subjected to pressing force from the horizontal fixing shank, receives a pressing force from the curved portion subsequently said horizontal fixed shaft portion, Due to this continuous pressing force, the rotating shaft portion descends in the elongated hole, and after the vertical portion starts to contact the horizontal fixed shaft portion, the rotating shaft portion does not descend, and the free caster Is held in the lowered position .
[0009]
According to the carry cart according to claim 2, when the base plate is raised and lowered, the elevating part provided on the free caster holding member elevates while being guided by the inner wall surface of the vertical cylindrical part, so that it is exposed to the outside and protruded. It is not necessary to provide a special guide post (see the above-mentioned conventional publication), the structure is simple, and the design and safety are excellent.
[0010]
A carry cart according to a third aspect of the present invention is the carriage cart according to the first or second aspect, wherein the carry plate is normally retracted by a spring biasing force, and is pulled out against the spring biasing force when the base plate is in a standing state. A hook is provided that is hooked on the shelf frame and holds the base plate in an upright state.
[0011]
According to the carry cart according to claim 3, since the base plate can be locked to the shelf frame using a hook provided on the base plate, There is no need to prepare special tools such as a separate band.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a perspective view of a carry cart according to an embodiment of the present invention when the base plate is lying down, FIG. 2 is a perspective view of the carry cart when the base plate is raised, and FIG. 3 is an exploded perspective view of a free caster lifting mechanism. 4 is a perspective view of the free caster lifting mechanism when the base plate is overlaid, FIG. 5 is a perspective view of the free caster lifting mechanism when the base plate is upright, and FIG. 6 is a perspective view of the free caster lifting mechanism when the base plate is lying down. FIG. 8 is a side view of the free caster lifting mechanism when the base plate is erected, FIG. 8A is a schematic sectional view showing a hook storage state when the base plate is overlaid, and FIG. FIG. 9A is a schematic cross-sectional view showing the state of use of the hook when the plate is raised, FIG. 9A is an explanatory view showing the positional relationship among the carriage frame, the fixed caster, the universal caster and the floor surface in this embodiment, and FIG. , Bogie frame, fixed caster, universal caster in the prior art And explanatory view showing the positional relationship of the floor surface, FIG 10 is an explanatory view of the nesting of the present embodiment.
[0014]
1 to 8, the carry cart includes a cart frame 10 that is H-shaped in plan view, and a fixed caster 20 is mounted on the bottom surface of the center of the cart frame 10 in the front-rear direction, and a front end portion of the cart frame 10. Swivel casters 30 are mounted on the bottom surface and the bottom surface of the rear end. The cart frame 10 has three horizontal frames 11 at the front and rear and the center. As shown in FIGS. 3 to 5, the front and rear horizontal frames 11 are formed in a rectangular box shape opened downward. A cylindrical shelf frame holding portion 12 is fixed to the center of the upper surface of the horizontal frame 11, and a base portion 71 of the shelf frame 40 is inserted into the inside of the shelf frame holding portion 12 from above and fixed by screws 50. Further, the end of the vertical frame 13 is fixed to the shelf frame holding portion 12 away from the upper surface of the horizontal frame 11. The central portion of the vertical frame 13 is fixed to the upper surface side of the central horizontal frame 11. In this way, the cart frame 10 is configured such that the vertical frame 13 is located above the horizontal frame 11, so that the cart frame 10 of another carry cart is overlapped from the lateral direction (left-right direction) of the cart frame 10 to be nested. Can be performed.
[0015]
On the carriage frame 10, a double-spread base plate 60 that is divided into two in the front-rear direction is placed so that it can be raised and lowered. A concave portion 61 in the front-rear direction is formed on the bottom surface of each base plate 60. When lying down, the vertical frame 13 is accommodated in the concave portion 61, and the left and right end portions of each base plate 60 ride on the top surface of the horizontal frame 11. Yes.
[0016]
A free caster lifting mechanism 70 is provided between the end of each base plate 60 on the shelf frame 40 side and the free caster 30.
[0017]
The universal caster elevating mechanism 70 includes a vertical cylindrical portion 71 provided on the cart frame 10 side. In the case of this embodiment, this vertical cylindrical part 71 is comprised by the base of the shelf frame 40. FIG. Inside the vertical cylindrical portion 71, an elevating portion 72 is accommodated so as to be movable only in the vertical direction while being guided by the inner wall surface of the vertical cylindrical portion 71. In the case of this embodiment, the elevating part 72 is constituted by an elevating member having a substantially U-shaped cross section. The lower end of the elevating part 72 is fixed to the upper surface of a rectangular box-shaped universal caster holding member 73 opened upward by welding or the like. The universal caster holding member 73 is partially inserted from below into the rectangular box-shaped horizontal frame 11 that opens downward, and the universal caster holding member 73 can be moved up and down with respect to the horizontal frame 11. A horizontal elevating shaft 74 projects from the side wall of the elevating unit 72. In the case of this embodiment, the horizontal elevating shaft portion 74 is constituted by a rod that is inserted into a through hole 72a formed in the left and right side wall portions of the elevating portion 72 and fixed by a stopper 74a. A vertical hole 75 in the vertical direction is formed in the left and right side wall portions of the vertical cylindrical portion 71, and the elevating horizontal shaft portion 74 is inserted through the long hole 75. On the left and right side wall portions of the vertical cylindrical portion 71, a horizontal fixed shaft portion 76 is provided at an upper position near the long hole 75. In the case of the present embodiment, the horizontal fixed shaft portion 76 is constituted by a rod that is inserted into a through hole 71a formed in the left and right side wall portions of the vertical cylindrical portion 71 and is fixed by a stopper metal 76a. A rotating arm 77 is provided between the horizontal lifting shaft 74 and the base plate 60. The rotating arm 77 includes a rotating shaft portion 78 that is rotatably fitted to the horizontal elevating shaft portion 74. In the case of this embodiment, the rotating shaft part 78 is comprised by the cylindrical member. One end of the curved plate portion 79 is fixed to the upper end of the rotating shaft portion 78 by welding or the like. The curved plate portion 79 includes a horizontal portion 79a extending horizontally from the rotary shaft portion 78, a curved portion 79b bent substantially perpendicularly downward from the horizontal portion 79a, and a vertical portion 79c extending vertically from the curved portion 79b. The base plate attaching portion 79d extends horizontally from the vertical portion 79c and is attached to the lower surface of the base plate 60. 1 and 2, reference numeral 90 denotes a brake member for the fixed caster 20, 91 denotes a brake pedal that is stepped on when braking, and 92 denotes a release pedal that is stepped on when releasing the brake.
[0018]
Next, the operation of the carry cart configured as described above will be described for each case.
[0019]
(1) When the base plate 60 is in a lying state (FIGS. 1, 4, and 6)
The elevating part 72 receives a force in the upward direction from the floor surface due to the load of the horizontal frame 11, the shelf frame 40, etc., and the horizontal elevating shaft part 74 is located at the upper end of the long hole 75. That is, the universal caster 30 is in the raised position. At this time, the fixed caster 20 is always in contact with the floor surface, and the free caster 30 is in the raised position as described above. Therefore, the carry cart can fix the fixed caster by grounding the free caster 30 either forward or backward. 20 becomes a four-wheeled vehicle and can move.
[0020]
(2) When the base plate 60 is erected, when the operation of lifting the base plate 60 and rotating the base plate 60 toward the shelf frame 40 is started approximately 90 degrees, the rotary shaft portion 78 of the rotary arm 77 rotates around the horizontal lifting shaft portion 74. The horizontal portion 79a of the curved plate portion 79 comes into contact with the horizontal fixed shaft portion 76. After the horizontal portion 79a comes into contact with the horizontal fixed shaft portion 76, the horizontal portion 79a first receives a pressing force from the horizontal fixed shaft portion 76, and subsequently the curved portion 79b receives a pressing force from the horizontal fixed shaft portion 76. Due to the continuous pressing force, the rotary shaft portion 78 descends in the elongated hole 75, and after the vertical portion 79c starts to contact the horizontal fixed shaft portion 76, the pressing force from the horizontal fixed shaft portion 76 disappears. The rotating shaft part 78 does not descend. As the rotary shaft 78 descends, the elevating part 72 descends while being guided by the inner wall surface of the vertical cylindrical part 71 via the horizontal elevating shaft part 74, and the free caster 30 reaches the lowered position.
[0021]
(3) When the base plate 60 is in an upright state (FIGS. 2, 5, and 7)
The vertical portion 79 c of the curved plate portion 79 is in pressure contact with the horizontal fixed shaft portion 76, and the horizontal lifting shaft portion 74 is located at the lower end of the long hole 75. Moreover, the universal caster 30 is in the lowered position, and the fixed caster 20 is in a state of floating from the floor surface. Therefore, the carry cart is a four-wheeled vehicle using only the free casters 30 and can move in any of the front, rear, left and right directions.
[0022]
Further, in this standing state, as shown in FIG. 8 (A), the hook 96 brought into the retracted state by the spring 95 is pulled out to the upper surface side of the base plate 60, and the shelf frame 40 as shown in FIG. 8 (B). When the base plate 60 is engaged with the base plate 60, the base plate 60 can be kept standing even if any external force is applied to the base plate 60.
[0023]
(4) When the base plate 60 is laid down, in this case, the operation is the reverse of the operation for raising the base plate as described above.
[0024]
As described above, the carry cart according to the present embodiment includes the cart frame 10 having a nestable shape, the fixed caster 20 mounted on the bottom surface of the central portion of the cart frame 10 in the front-rear direction, and the cart frame 10. A free caster 30 attached to the bottom surface of the front end portion and the bottom surface of the rear end portion via a free caster raising / lowering mechanism 70, and a double-spreading base plate that is placed on the carriage frame 10 so as to be raised and lowered and divided into two in the front-rear direction. 60 and each base plate 60 is provided in a one-to-one relationship. When the base plate 60 is raised, the rotary shaft (rotary shaft portion 78) of the base plate 60 is lowered while being rotated. When the free caster 30 is lowered in conjunction with the lowering of the rotary shaft portion 78) and the base plate 60 is laid down, the rotary shaft (the rotary shaft portion 78) of the base plate 60 is rotated upward. And a free caster elevating mechanism 70 for raising the free caster 30 in conjunction with the ascent of the rotary shaft (rotary shaft portion 78), and when the two base plates 60 are in a lying state, the fixed caster 20 is always on the floor surface. In addition, when the two base plates 60 are in the standing state, each of the free casters 30 is always in contact with the floor surface, and the fixed caster 20 is in a state of floating from the floor surface.
[0025]
For this reason, according to the carry cart according to the present embodiment, the base plate 60 is divided into two in the front-rear direction (longitudinal direction), and each base plate 60 is raised as shown in FIG. Since the free caster 30 is lowered and the fixed caster 20 is lifted from the floor surface 100, the cart frame 10 is kept parallel to the floor surface 100 even when the base plate 60 is standing up. (Compare with the prior art of FIG. 9B). Therefore, as shown by the one-dot chain line and the two-dot chain line in FIG. 10, nesting can be performed without considering the front-rear direction of the carry cart, and the nesting operation becomes extremely simple. Further, as shown in FIG. 9A, the downward stroke amount S1 of the free caster 30 may be half of the conventional downward stroke amount S2 shown in FIG. 9B. Further, since the base plate 60 is divided into two, the height (height) of the stand-up base plate 60 is half that of the conventional one. Therefore, when moving a plurality of nested carry carts to a storage place or the like, The base plate 60 in the state does not obstruct the field of view and makes it easier to see the front.
[0026]
Further, in the carry cart according to the present embodiment, the free caster elevating mechanism 70 is provided in the vertical cylindrical portion 71 provided on the cart frame 10 side and the free caster holding member 73 that holds the free caster 30, and the vertical cylinder is provided. Elevating part 72 accommodated in vertical cylindrical part 71 so as to be movable only in the vertical direction while being guided by the inner wall surface of cylindrical part 71, horizontal elevating shaft part 74 protruding from the side wall part of elevating part 72, and vertical cylindrical part 71 is formed in the side wall portion of 71, and the vertical elongate hole 75 through which the horizontal elevating shaft portion 74 is inserted, and the horizontal fixed shaft portion provided in the side wall portion of the vertical cylindrical portion 71 and positioned near the upper portion of the long hole 75. 76, a rotary shaft 78 that is rotatably fitted to the horizontal lifting shaft 74, and a rotary arm 77 having a curved plate portion 79 provided between the rotary shaft 78 and the base plate 60. Prepared, base plate 60 When raising and lowering the horizontal lifting shaft portion 74 long hole 75 moves downward and upward by the curved plate portion 79 is rotated while being in contact with the horizontal fixed shaft portion 76 equivalents, universal caster 30 is lowered and raised. For this reason, when raising and lowering the base plate 60, the elevating part 72 provided on the universal caster holding member 73 elevates while being guided by the inner wall surface of the vertical cylindrical part 71. It is not necessary to provide a guide post (see the above-mentioned conventional publication), the structure is simple, and the design and safety are excellent.
[0027]
The carry cart according to the present embodiment is normally retracted to the base plate 60 by the biasing force of the spring 95, and is pulled out against the biasing force of the spring 95 when the base plate 60 is in the standing state. A hook 96 that is hooked on the shelf frame 40 and holds the base plate 60 in an upright state is provided. Therefore, since the base plate 60 can be locked to the shelf frame 40 using the hook 96, a special tool such as a band separate from the carry cart is used to lock the base plate 60 to the shelf frame 40. You do not have to prepare.
[0028]
【The invention's effect】
According to the carry cart of the present invention, it is not necessary to consider the direction of the carry cart in the front-rear direction during the nesting operation, and the downward stroke amount of the free caster can be halved. The present invention can be applied to all nestable carry carts and is not limited to the carry cart having the H-shaped carriage frame as described above. For example, the invention has a Z-shaped carriage frame. It can also be applied to carry carts.
[Brief description of the drawings]
FIG. 1 is a perspective view of a carry cart according to an embodiment of the present invention when a base plate is overlaid.
FIG. 2 is a perspective view of the carry cart when the base plate stands up.
FIG. 3 is an exploded perspective view of a universal caster lifting mechanism.
FIG. 4 is a perspective view of a free caster raising / lowering mechanism when the base plate is overlaid.
FIG. 5 is a perspective view of a free caster lifting mechanism when the base plate is raised.
FIG. 6 is a side view of the free caster elevating mechanism when the base plate is overlaid.
FIG. 7 is a side view of the free caster lifting mechanism when the base plate is raised.
FIG. 8A is a schematic cross-sectional view showing a hook retracted state when the base plate is overlaid, and FIG. 8B is a schematic cross-sectional view showing a hook use state when the base plate is erected.
FIG. 9A is an explanatory view showing the positional relationship between a bogie frame, a fixed caster, a free caster, and a floor surface in the present embodiment; FIG. 9B is a view showing a positional relationship between a bogie frame, a fixed caster, a free caster, and a floor in the prior art; It is explanatory drawing which shows the positional relationship of a surface.
FIG. 10 is an explanatory diagram of nesting in the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bogie frame 20 Fixed caster 30 Swivel caster 40 Shelf frame 60 Base plate 70 Swivel caster elevating mechanism 71 Vertical cylindrical part 72 Elevating part 73 Swivel caster holding member 74 Horizontal elevating shaft part 75 Long hole 76 Horizontal fixed shaft part 77 Rotating arm 78 Rotating shaft (Rotating shaft)
79 Curved plate part 95 Spring 96 Hook

Claims (3)

A truck frame having a nestable shape;
A fixed caster attached to the bottom surface of the substantially central part in the front-rear direction of the carriage frame;
A free caster attached to the bottom surface of the front end and the bottom surface of the rear end of the carriage frame via a free caster lifting mechanism,
A double-folded base plate that is placed on the carriage frame so as to be able to undulate and is divided into two in the front-rear direction;
One to one for each base plate. When the base plate is erected, the rotary shaft itself is lowered while rotating the rotary shaft of the base plate, and the free caster is interlocked with the downward movement of the rotary shaft. When the base plate is lowered, the rotary shaft itself is raised while rotating the rotary shaft of the base plate, and the free caster lifting mechanism that raises the free caster in conjunction with the rise of the rotary shaft; When the two base plates are in a lying state, the fixed caster is always in contact with the floor surface. When the two base plates are in the standing state, each free caster is always in contact with the floor surface . Ri Do state fixed casters floats from the floor by, and the carry cart the cart frame is equal to or configured to be kept in parallel to the floor surface. The universal caster lifting mechanism is
A vertical cylindrical portion provided on the carriage frame side;
An elevating part that is provided in a free caster holding member that holds the free caster and is accommodated in the vertical cylindrical part so as to be movable only in the vertical direction while being guided by the inner wall surface of the vertical cylindrical part;
A horizontal lifting shaft protruding from the side wall of the lifting unit;
An elongated hole formed in a side wall portion of the vertical cylindrical portion and through which the horizontal lifting shaft portion is inserted;
A horizontal fixed shaft portion provided on a side wall portion of the vertical cylindrical portion and positioned immediately above the elongated hole;
A rotation shaft portion rotatably fitted on the horizontal lifting shaft portion, and a rotation arm having a curved plate portion provided between the rotation shaft portion and the base plate,
The curved plate portion includes a horizontal portion extending horizontally from the rotating shaft portion, a curved portion bent substantially perpendicularly downward from the horizontal portion, a vertical portion extending vertically from the curved portion, and the vertical portion. A base plate attaching portion that extends horizontally and is attached to the lower surface of the base plate;
When the base plate is erected, the horizontal portion of the curved plate portion receives a pressing force from the horizontal fixed shaft portion, and subsequently the curved portion receives a pressing force from the horizontal fixed shaft portion. The rotary shaft portion descends in the elongated hole, and after the vertical portion starts to contact the horizontal fixed shaft portion, the rotary shaft portion does not descend and the free caster is held in the lowered position. carry cart according to claim 1, characterized in that it is.   The base plate is normally retracted by the biasing force of the spring, and when the base plate is in the standing state, the base plate is pulled out against the biasing force of the spring and hooked on the shelf frame to hold the base plate in the standing state. The carry cart according to claim 1 or 2, further comprising a hook.

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