JP4073245B2 - Carriage for transportation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carrier for transportation having high stability of positioning and fixing of a stacking state of carrier bases by tightly constraining rotation of a universal caster wheel. <P>SOLUTION: In the carrier for transportation, a plurality of wheels having at least one universal caster are mounted to the lower surface of a carrier base, and the upper surface is provided with a wheel constraining part at a position of each wheel of the carrier for transportation placed on it. The wheel constraining part has an outer engaging region for constraining an outer part of the universal caster wheel in the turn radial direction from moving in the outside direction of the turn radius, and two constraining step parts for constraining the movement of both inner corner parts in the turn radial direction of the wheel while the outer part is positioned in a range of the outer engaging region. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transportation carriage used as a flat carriage, a hand carriage, a shelves, etc. mainly for transporting materials in a factory or the like, and more specifically, a plurality of carriages including at least one universal caster on the lower surface of the carriage base. Each wheel is attached to the upper surface, and belongs to the technical field of a transporting carriage in which a wheel restraining portion for restraining the movement of the wheel is installed at the position of each wheel of the transporting carriage placed on the upper surface.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various transport carts in which wheel restraints for restraining movement of each wheel of a transport cart mounted on the top surface of the cart base are installed. For example,
(1) The transportation carriage disclosed in Japanese Patent No. 2683726 has a configuration including holding means including an outer engagement area and an inner engagement area with respect to a wheel of a free caster.
(2) The transport cart disclosed in Japanese Patent No. 2971320 is formed with a wheel fixing portion having a rectangular shape and a size matching the universal wheel in order to fix the universal caster wheel in the engaged state.
(3) The transportation carriage disclosed in Japanese Patent Application Laid-Open No. 2001-138922 is formed with recessed wheel receiving portions for accommodating the free caster wheels at the four corners of the carriage base, and the wheel receiving portions mount the wheels by partition walls. It is partitioned into a wheel receiving chamber that can be placed.
[0003]
[Problems to be solved by the invention]
The conventional above-described transport cart is common for the purpose of obtaining a stable stacked state by restraining the movement of each wheel of the transport cart mounted thereon.
[0004]
However, in the transportation carts described in the above (2) and (3), since the wheel fixing portion or the wheel receiving portion is formed in a rectangular shape, each of the free caster wheels of the transportation cart to be placed thereon is provided. The direction must be determined (guaranteed) in a rectangular shape as a wheel fixing part or a wheel receiving part, which is inconvenient and difficult to use.
[0005]
The transportation cart posted in the above (1) has a degree of freedom in the direction of the free caster wheels, and does not have the above-mentioned problems. However, since it is not configured to restrain the rotation of the free caster wheel itself held by the wheel holding means in a plan view (hereinafter referred to as "rotation"), If you look at it, the grounding point of the universal caster wheel will be the fixed point, and the cart base supported via the caster arm will turn in the opposite direction, and the plane position between the cart bases stacked up and down The relationship will be off. In other words, the positioning and fixing functions of the stacked bases of the cart bases that are stacked up and down are unstable, and there is a problem in transportation and storage.
[0006]
Accordingly, the object of the present invention is to provide freedom or tolerance in the direction of the free caster wheels during stacking work, which is convenient for use, and that the free caster wheels themselves rotate exactly (rotation) in plan view. It is an object of the present invention to provide a transporting carriage with high stability of positioning and fixing in a stacked state of the bases of the trucks that are restrained and stacked up and down.
[0007]
[Means for Solving the Problems]
As a means for solving the above-described problems of the prior art, the transportation carriage according to the invention described in claim 1 is:
A plurality of wheels including at least one universal caster are attached to the bottom surface of the carriage base, and a wheel restraining portion for restraining the movement of the wheels is installed on the top surface at the position of each wheel of the transportation carriage mounted thereon. In the transport cart that has been
The wheel restraining portion 4 of the universal caster wheel 3 is an outer side as a riding edge that restrains restraining movement of the outer side portion 3a of the free caster wheel 3 outside the turning radius in the turning radius direction. The engagement region 4a is formed in an arc shape in plan view over a range of a certain turning angle α in the turning direction of the free caster wheel 3 with the position corresponding to the turning axis 30 of the free caster wheel 3 as the center. The two constraining stepped portions 4b, which are two oblique sides having a fan shape in plan view, are formed inwardly in the turning direction of the free caster wheel 3 toward the position corresponding to the turning shaft core 30 from both end positions of the engagement region 4a. made is formed to a position that restrains against the both corner portions 3b 'of the wheel inner portion 3b,
The wheel restraining portion 4 is formed of a rubber material having a large friction coefficient, and is fitted into an attachment portion formed as a recess on the upper surface of the carriage base 2, and the outer engagement region 4 a is placed on the upper surface of the carriage base 2. It is installed in a state protruding from the top surface of the carriage base 2 so as to serve as a slip stopper for the luggage to be
Said outer engagement areas 4a and two restraining stepped portion 4b and the universal caster wheels 3 enters into enclosed concave portion 4c, the hit wheel outer part 3a of the rotary radially outboard is to the outer engaging region 4a in state, both corner portions 3b of the wheel inner portion 3b of the turning radius direction inboard of the universal caster wheels 3 ', characterized in that the movement against the said two restraining stepped portion 4b is configured to be constrained .
[0008]
The invention described in claim 2 is the transportation carriage described in claim 1,
The wheel restraint portion 4 of the universal caster wheel 3 includes an outer engagement region 4a , two restraint step portions 4b formed in a series from both end positions thereof , and a concave surface portion 4c surrounded by these in a plan view. As seen , the outer shape is circularly formed by a pair having a diameter line with a turning angle of 180 degrees as line symmetry.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, illustrated embodiments of the present invention will be described.
[0011]
FIGS. 1-7 has shown embodiment in case the trolley | bogie for transportation which concerns on the invention described in Claim 1 is a flat trolley | bogie.
[0012]
A total of five free caster wheels 3 are attached to the transport cart 1, one at each of the four corners of the lower surface of the cart base 2 and one at the center. The wheel 3 is a resin tire wheel. On the upper surface of the same carriage base 2, the position of each wheel 3 of the same type of carriage 1 mounted on the same base as shown in FIG. 7 (the same position as the pivot axis 30 of each free caster wheel 3) is set. The same number of wheel restraint portions 4 that restrain the movement of the existing caster wheels 3 are installed.
[0013]
The wheel restraint portion 4 of the illustrated example is formed in a size and a shape (circular shape) that covers the entire circumference of the turning range around the turning axis 30 of the free caster wheel 3 when viewed in plan.
[0014]
As shown in FIGS. 3 to 6, the wheel restraining portion 4 of the universal caster wheel 3 is configured such that the outer side portion 3 a of the universal caster wheel 3 on the outer side in the turning radius direction moves outward in the turning radius. Is formed in an arc shape over a range of an appropriate turning angle α in the turning direction (arrow directions P and Q in FIG. 4A).
[0015]
Incidentally, in the case of the present invention, as seen in a plan view as shown in FIG. 4A, the distance from the turning axis 30 of the free caster wheel 3 to the rotating axis 31 of the wheel 3 is called the turning radius R, and the direction is called the turning radius direction. . Then, the direction of the arrow of the turning radius R in FIG. 4 is defined as the outside in the turning radius direction, and the opposite direction is defined as the inside.
[0016]
The outer engagement region 4a is formed as a riding edge that restricts or restrains the movement of the free caster wheel 3 in the direction of the outer side of the turning radius direction. Inevitably, the inner portion of the outer engagement region 4a is formed as a concave surface portion 4c recessed in a tray shape (FIG. 5).
[0017]
Next, in the free caster wheel 3, the outer side portion 3a of the outer side in the turning radius direction is positioned within the outer engagement region 4a (in the concave portion 4c), and the outer portion 3a of the wheel 3 is the outer side. In a state where it hits the engagement region 4a and is restrained from moving outward in the turning radius, it hits both corners 3b′3b ′ of the wheel inner portion 3b inward of the turning radius direction of the wheel 3 Two constraining step portions 4b and 4b that restrict or constrain form a fan-shaped two oblique sides in series with the outer engagement region 4a and surround the concave surface portion 4c. As is apparent from FIGS. 3 and 4, the two restraining step portions 4b and 4b are fan-shaped two hypotenuses as step portions having substantially the same height from both end positions of the outer engagement region 4a forming an arc having a turning angle α. Is formed up to the vicinity of the turning center (position corresponding to the turning axis 30) , more specifically, to the position where it is constrained by striking both corners 3b'3b 'of the wheel inner portion 3b . On the other hand, the universal caster wheel 3 is a resin tire wheel, as described above, and is relatively slippery. Accordingly, in the free caster wheel 3 that has entered the concave surface portion 4c, the corner portions 3b ′ and 3b ′ of the inner side portion 3b of the inner side in the turning radius direction always contact the two restraining step portions 4b and 4b on both sides. Since the movement is restricted or constrained, so-called rotation does not occur, and the pivot axis 30 of the free caster wheel 3 is located at the center of the wheel restraint portion 4, so that the stack with the carriage on the top surface is vertical. Multi-stage stacking is also stable. In addition, the wheel contact surface of the restraint step part 4b does not need to be the illustrated inclined surface, and the same operation effect can be obtained even if it is a form that stands at right angles as much as possible.
[0018]
As a preferred embodiment, the wheel restraint portion 4 of the free caster wheel 3 shown in FIG. 4A has a fan-shaped outer engagement region 4a and two restraint step portions 4b and 4b as viewed in a plan view. It is formed in a line-symmetric shape with a line as a symmetric line, and its outer shape is circular (the invention described in claim 2). That is, the left and right concave surface portions 4c and 4c can be used as wheel restraint portions, respectively. Because of the line-symmetric shape, the vicinity of the turning center portion of the constraining step portion 4b protruding into a substantially V shape is formed as a concave surface having a depth where the concave portions 4c and 4c are connected.
[0019]
Further, the wheel restraint portion 4 of the universal caster wheel 3 shown in FIG. 4B is formed by connecting the vicinity of the turning center portion of the two restraint step portions 4b and 4b at the height of the restraint step portion 4b. 4c and 4c are formed in the concave surface of the divided depth.
[0020]
According to the wheel restraining part 4 of the universal caster wheel 3 having the above-described configuration, only the position is set such that each of the universal caster wheels 3 of the same type transport cart 1 stacked thereon is placed on the corresponding wheel restraining part 4. The orientation of the transport carts 1 to be stacked is opposite to the orientation of the transport cart 1 located below at an angle of π rad (180 °). Even so, if each wheel 3 is housed in the concave surface portion 4c, the corner portions 3b 'and 3b' of the inner portion 3b in the turning radius direction will eventually settle down, and the two restraining step portions 4b and 4b on both sides will be settled. At the same time, the outer portion 3a of the wheel 3 in the turning radius direction of the wheel 3 hits the outer engagement region 4a to be in a restricted state. Further, even if the wheels 3 are unevenly oriented and are directed in the W direction in FIG. 4B, if the carriage base 2 is swung in the front-rear direction (perpendicular to the direction of the wheels 3), the outer engagement region 4a. And the two restraining step portions 4b and 4b work to cancel the imbalance of the contact condition (contact pressure), and quickly rotate in the U direction, so that the general direction is determined in the U direction, and the wheel 3 The pivot axis 30 is moved to the center position of the wheel restraining portion 4, resulting in a resting state.
[0021]
Thus, the outer portion 3a in the turning radius direction of the free caster wheel 3 is restrained by the outer engagement region 4a, and both corners 3b ′ and 3b ′ of the inner portion 3b in the turning radius direction are also between the two restraining step portions 4b and 4b. It settles and is stabilized. Therefore, during the stacking work of the transport carriage 1, consideration and operation for predetermining (guaranteeing) the orientation of the free caster wheel 3 are not particularly required.
[0022]
Moreover, since both corners 3b 'and 3b' of the inner portion 3b of the swivel caster wheel 3 in the turning radius direction are firmly restrained from both sides by the two restraining step portions 4b and 4b, so-called "spinning" of the wheel 3 is ensured. Is prevented. Therefore, there is no concern that the transport carts 1... Stacked in multiple stages as shown in FIG. 7 will be misaligned with each other, and an extremely stable stacked state is maintained.
[0023]
Wheel restraining section 4 of the above construction is formed in such a rubber material coefficient of friction is greater as an example, so that also serves as a slip stopper of the luggage is placed on the upper surface of the carriage base 2, the outer engagement area 4a, 5, as shown in FIG. 6, that is installed in a state protruding from the upper surface of the carriage base 2. Reference numeral 4e in FIGS. 3 and 4 is a drain hole for rainwater or the like.
[0024]
As a means for installing the wheel restraining portion 4 having the above-described configuration on the upper surface of the carriage base 2, as shown in FIGS. 5 and 6, a tenon projection 4 d is provided on the lower bottom surface of the wheel restraining portion 4. . On the other hand, a mounting portion is provided as a concave surface having the same depth as the wheel restraining portion 4 on the upper surface of the carriage base 2, and the wheel restraining portion 4 is accommodated so as to be fitted into the mounting portion, and a tenon provided in advance in the mounting portion. The tenon protrusions 4d are fitted into the holes and stopped.
[0026]
1 and 2 show that the wheel restraining portion 4 is perpendicular to the forward / reverse direction of the carriage 1 (directions of arrows E and F in FIG. 1) of the universal caster wheel 3 toward the upper surface of the carriage base 2. Fig. 4 illustrates an embodiment installed in an arrangement that is constrained in orientation. However, it can also be implemented by placing the free caster wheels 3 in the same direction as the forward / reverse direction of the transport carriage 1 (directions of arrows E and F in FIG. 1).
[0027]
In the above-described embodiment, when the wheel restraint portion 4 is viewed in plan, a shape (a circle as a whole) is formed of a pair of line symmetry with the BB line passing through the center of the pivot axis 30 of the free caster wheel 3 as the symmetry line. ), But is not limited to this. For example, as shown in FIG. 8A, a semicircular shape of only one side portion of the symmetric line corresponding to the BB line, or a little to the left of the symmetric line as shown in FIG. 8B. It can be similarly implemented in a non-circular / non-circular form including up to the position. In this case, another semi-circular wheel restraint part, or simply a semi-circular object or a non-circular remaining non-circular object is fitted in the air space of the attachment part of the carriage base 2 to position the wheel restraint part. Prevent wheel 3 from falling into the airspace. 8A and 8B also show that the turning angle α of the outer engagement region 4a is substantially similar, but the inclination angle of the constraining step portion 4b is different in magnitude such that β ₁ > γ ₁ and β ₂ <γ _2. The form is shown. In short, if the swivel angle α of the outer engagement region 4a and the inclination angles (β, γ) of the constraining step portion 4b are appropriately designed and implemented so that the free caster wheel 3 can be easily accommodated and exert a restraining effect. It ’s good.
[0028]
Regarding the form of the constrained step 4b in a plan view, as shown in FIG. 10A, the overall shape is a boat shape, and the portions where the corners 3b ′ and 3b ′ of the inner part 3b of the wheel 3 are in contact with the inner tip. 10B, the overall configuration is a parallel configuration as shown in FIG. 10B, and both corners 3b ′ and 3b ′ of the inner portion 3b of the wheel 3 hit only the inner tip portion to restrain it. It can also be implemented by the constraining step 4b in the form of an arrow to receive. In addition, as shown in FIG. 9, the constraining step portion 4b can be formed and implemented as an independent protrusion on the concave surface portion 4c in the circular external engagement region 4a.
[0029]
Next, in the transport carriage shown in FIG. 11, two rear wheels on the lower surface of the carriage base 12 are fixed caster wheels 13, two front wheels are free caster wheels 3, and a handle 15 is provided on the rear wheel side. 1 shows an embodiment of a handcart. Each wheel restraint part 14 and 4 is provided in the corner joint 11 for cart bases at four corners.
[0030]
The wheel restraint portion 14 for the rear wheel on the upper surface of the carriage base 12 is provided in a rectangular shape because the direction of the rear wheel 13 is fixed. For the front caster wheel 3, the wheel restraining portion 4 having the above-described configuration is employed as it is.
[0031]
In the carriage shown in FIG. 12, the universal caster wheels 3 are adopted for the wheels located at the four corners of the lower surface of the carriage base 22, and the frame carriage provided with a U-shaped upper frame 20 when viewed in plan. The embodiment of is shown. As a matter of course, the wheel restraint portion 4 on the upper surface of the carriage base 22 is entirely the same as the wheel restraint portion 4 configured as described above for the free caster wheel 3, and is provided at the corner joint 11 for the carriage base at the four corners. .
[0032]
Although illustration is omitted, the present invention can be similarly applied to a so-called tricycle in which the front wheel is one universal caster wheel and the two rear wheels are fixed wheels or universal caster wheels.
[0033]
【The invention's effect】
In the transport cart according to the first and second aspects of the present invention, the wheel restraint portion 4 developed for the free caster wheel is used, and the direction of the free caster wheel during the stacking operation of the transport cart is free or allowable. Therefore, it is convenient for stacking carts and easy to work. In addition, since the rotation of the free caster wheel itself viewed in a plane (so-called rotation) is constrained within the external engagement area, the stacked base of the cart base stacked up and down is constant, so positioning and stability are high, and the stacked state It is very convenient for transportation and storage.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a flat carriage.
FIG. 2 is a perspective view showing an embodiment of a flat carriage.
FIG. 3 is a perspective view showing a wheel restraining portion.
FIGS. 4A and 4B are plan views showing a situation in which a free caster wheel is restrained by a wheel restraining portion.
5 is a cross-sectional view taken along line AA in FIG. 4A.
6 is a cross-sectional view taken along line BB in FIG. 4A.
FIG. 7 is a perspective view showing a stacked state of flat carriages.
FIGS. 8A and 8B are plan views showing different embodiments of the wheel restraining portion. FIGS.
FIG. 9 is a plan view showing a different embodiment of the wheel restraining portion.
FIGS. 10A and 10B are plan views showing different embodiments of the wheel restraining portion. FIGS.
FIG. 11 is a perspective view showing a state in which handcarts are stacked.
FIG. 12 is a perspective view showing an embodiment of a frame carriage.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Carriage for trolley 2 Carriage base 3 Swivel caster wheel 4 Wheel restraint part R Turning radius 4a Outer engagement area | region 4b Restraint step part

Claims (2)

A plurality of wheels including at least one universal caster are attached to the bottom surface of the carriage base, and a wheel restraining portion for restraining the movement of the wheels is installed on the top surface at the position of each wheel of the transportation carriage mounted thereon. In the transport cart that has been
The wheel restraint portion (4) of the universal caster wheel (3) is a ride that restrains the outer wheel outer portion (3a) of the universal caster wheel (3) that is outside the turning radius from moving toward the outside of the turning radius. A constant turning angle (α) in the turning direction of the universal caster wheel (3) with the outer engagement region (4a) as an edge centered at a position corresponding to the turning axis (30) of the universal caster wheel (3). is formed in plan view in an arcuate shape over a range of, in sequence from the both end positions of the outer engagement area (4a), two restraining stepped portion in plan view is two oblique side fan (4b) is, the pivot axis To the position corresponding to (30), it is formed to a position where it hits and restrains both corners (3b ′) of the wheel inner part (3b) inward in the turning direction of the free caster wheel (3) ,
The wheel restraining portion (4) is formed of a rubber material having a large friction coefficient, and is fitted into a mounting portion formed as a recess on the upper surface of the carriage base (2), and the outer engagement region (4a) is provided on the carriage base. It is installed in a state protruding from the upper surface of the carriage base (2) so as to serve as a slip stopper for the load placed on the upper surface of (2) ,
The free caster wheel (3) entering the concave surface portion (4c) surrounded by the outer engagement region (4a) and the two constraining step portions (4b) on both sides is a wheel outer portion ( In a state where 3a) hits the outer engagement region (4a), both corners (3b ′) of the inner wheel portion (3b) of the universal caster wheel (3) inward in the turning radius direction are A carriage for transportation, characterized in that it is configured to be constrained to move by hitting the step (4b). The wheel restraint portion (4) of the universal caster wheel (3) includes an outer engagement region (4a) , two restraint step portions (4b) formed in a series from both end positions , and a concave surface surrounded by them. The transportation part according to claim 1, characterized in that the outer part (4c) is formed in a circular shape by a pair having a diameter line with a turning angle of 180 degrees in line symmetry when viewed in plan. Trolley.

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