JP2009227042A - Transportation carriage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a transportation carriage capable of carrying and moving in a stable state even at a place without flatness by arranging casters on both right and left sides of a carriage body as outward as possible so that the range of turning reaches the outside of the carriage body when mounting six of turning casters or fixed casters on the carriage body. <P>SOLUTION: In the transportation carriage, three turning casters 2 are respectively and tandemly journaled to both right and left sides in a longitudinal direction of the plane rectangular carriage body, and a middle caster of the three casters is arranged more outward than the other front and behind two turning casters 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transport cart.

  As a transporting carriage for placing and transporting a load, for example, square pipes are joined vertically and horizontally by welding or the like to form a frame 4 in the form of a flat rectangular lattice, and a load mounting plate is provided on the frame 4. A base 1 is attached to form a bogie body, a revolving caster 2 is attached to the back side of the base 1, and a hand bar 3 is erected on the end of the base 1, and the car is moved by pushing the hand bar 3. A package is transported (see, for example, Patent Document 1).

  In many of these transport carts, the turning caster 2 is attached to four corners at the four corners on the back surface of the base 1 in total, for a total of four wheels.

  When the four-wheel turning casters 2 are arranged in this way, corner members 5 for standing the hand bar 3 are attached at the corners of the four corners of the bogie body, and the corner member 5, that is, the lower part of the hand bar 3 is the bogie. Since the structure protrudes downward from the main body, the swivel caster 2 is attached at an inner position where the lower protrusion of the hand bar 3 is avoided and does not come into contact therewith.

And the turning caster arrange | positioned at the corner | angular part of four corners is arrange | positioned in the same column.
JP 2006-51861 A

Moreover, in the following patent document, it is provided with two free wheels each for the front wheel and the rear wheel, and one or a plurality of fixed wheels in the straight direction in the middle between the front wheel and the rear wheel. A featured wheelbarrow has been proposed.
JP 2006-51861 A

  According to this patent document 2, the front wheel and the rear wheel are free wheels, and the central wheel located between them is a fixed wheel fixed toward the straight traveling direction of the handcart. If the wheel is pushed in the straight direction from the rear side, the vehicle travels straight through the fixed wheels and does not meander, and the straight traveling performance is excellent. Also, for example, when turning to the right, if the force from the rear is applied from the left, it can be bent slightly to the right by the rotating shaft of the fixed wheel. When rotating, the center of rotation is at the center of the fixed wheel and can rotate the smallest. Therefore, it can be easily operated even in a small place.

  In Patent Document 1, the left and right turning casters 2 are respectively arranged in a single column, but the turning range is inside the carriage body.

  By the way, when the swivel caster 2 is arranged as far as possible on the left and right sides of the cart body as much as possible, when loading a load on the cart body and moving on the ground where the flatness is not obtained, such as a depression or an uneven place. In addition, it can be transported stably without causing collapse of the cargo.

  However, as described above, the conventional swivel caster 2 is attached at a position further inward from the drooping position by the amount of “swivel eccentric radius + caster radius” so that all of the swivel casters 2 swivel (rotate) without any problem. For this reason, the turning movement range is located inside the carriage main body and is transported and moved in a somewhat unstable state.

  In Patent Document 2, there are at least six wheels including two universal wheels each for the front wheel and the rear wheel, and one or a plurality of fixed wheels in the straight direction between the front wheel and the rear wheel. In order to ensure straight traveling performance, the middle wheels other than the turning wheels arranged at the corners of the four corners are also arranged in the same column as the turning wheels of the four corners arranged at the front and rear.

  In this way, when the left and right wheels are arranged in a single column, the swivel range of the cart itself is inside the cart body. When moving on the ground where the flatness does not appear, it is transported and moved in a somewhat unstable state, and there is a risk of causing cargo collapse.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and when a six-wheel caster is attached to the cart body, the casters are arranged as far as possible on the left and right sides of the cart body so that the grounding range is It is an object of the present invention to provide a transport cart that can reach the outside and can be transported in a stable state even in a place with no flatness.

  In order to achieve the above-mentioned object, the present invention is characterized in that the invention according to claim 1 is a transport cart in which a caster is pivotally mounted on each of the left and right sides in the longitudinal direction of a flat rectangular cart body in three columns. The gist of the invention is that the middle caster of the casters is arranged outside the two front and rear swivel casters.

  According to the first aspect of the present invention, the three-wheel casters arranged in tandem on the left and right sides of the main body of the carriage are not in a straight line, but the middle caster is disposed on the left and right sides of the front and rear two-wheel turning casters. Therefore, the stability with respect to the inclination of the cart body in the left-right direction is improved, and the load stability when moving in a place having no flatness such as a depression or an uneven area is improved.

  The gist of the present invention described in claim 2 and claim 3 is that the middle caster is a turning caster, or the middle caster is a fixed caster that does not turn.

Even if the caster in the middle is a swivel caster or a fixed caster that does not swivel, it can be expected to improve the stability against the tilt of the cart body in the left-right direction. Is possible.

  The gist of the present invention according to claim 4 is that the corner members into which the lower portions of the hand push rods project downward are attached to the four corners of the carriage main body.

  According to the fourth aspect of the present invention, corner members are attached to the four corners of the cart body, and the turning casters arranged at the four corners are suspended by the amount of “swing eccentric radius + caster radius” as in the prior art. Even if it is attached at a position further inside, the middle turning caster is arranged on the outside, so that the stability of the transport cart can be ensured.

  The gist of the present invention described in claim 5 is that the turning range of the middle turning caster of the three-wheel turning casters protrudes outward from the left and right sides of the carriage body.

  According to the fifth aspect of the present invention, since the turning range of the middle turning caster of the three-wheel turning casters protrudes outward from the left and right sides of the carriage main body, when the carriage main body tries to tilt left and right Since the middle turning caster exists in the tilt direction, the middle turning caster reliably supports the bogie body to be tilted. Therefore, the stability of the cart body can be improved.

  As described above, when the carriage of the present invention is attached to the main body of the six wheels on the left and right sides of the three wheels, the center turning caster is arranged outside the left and right sides of the main body of the vehicle. Because it reaches the outside of the cart body, it can absorb the tilt of the cart body in the left-right direction, can be transported in a stable state even in places with no flatness, and can improve the load stability. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a bottom view showing an embodiment of a transport cart according to the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a bottom view of a corner portion, and FIG. 4 is a front view of the same. Similarly, it is composed of a frame 4 in which square pipes made of iron or aluminum alloy are joined by welding in a vertical and horizontal lattice shape, and a base 1 that is a mounting plate made of iron or aluminum alloy joined to the upper part of the frame 4. The

  The six-wheel turning caster 2 is attached to the lower surface of the lattice-like frame 4. In the arrangement example, three wheels are arranged on each of the left and right sides with respect to the longitudinal direction of the carriage body. The turning caster 2 is attached by fixing a hexagonal mounting plate 6 to the lower surface of the frame 4 with a rivet or the like, and fixing the pedestal of the turning caster 2 to the mounting plate 6 with a bolt or the like.

  Among the six-wheel turning casters 2, those arranged at the corners of the four corners of the bogie main body have a corner member 5 for inserting the hand bar 3 therein as shown in FIG. Since it is attached, it is attached to a portion that enters the inside of the cart body from the hanging part by the amount of “swing eccentric radius + caster radius” so that it can be rotated while avoiding the hand bar 3 and the corner member 5.

  In the present invention, the swivel casters 2 other than the swivel casters 2 arranged at the corners of the four corners of the cart body, that is, the center swivel caster 2 is arranged in a straight line with the swivel casters 2 arranged at the front and rear corners. Instead, as shown in FIG. 6, the swivel range is arranged outside the front and rear swivel casters 2 so that the swivel range protrudes outward from the left and right sides of the carriage body.

  In this way, the turning range of the middle turning caster 2 of the three-wheel turning casters 2 arranged at the left and right positions of the carriage main body projects outward from the left and right sides of the carriage main body, so that the carriage main body tilts left and right. At this time, since the middle turning caster 2 exists in the tilt direction, the middle turning caster 2 reliably supports the bogie body to be tilted.

  Therefore, the stability of the cart body can be improved, and the load stability when moving in a place having no flatness such as a depression or an uneven place is improved.

  As a second embodiment of the present invention, although not shown in the figure, the caster in the middle of the six-wheel casters attached to the lower surface of the lattice-like frame 4 can be a fixed caster instead of a turning caster. It is.

  Even when the fixed casters are used as described above, they are not arranged in a straight line with the swivel casters 2 arranged at the front and rear corners, but are arranged outside the front and rear swivel casters 2. The direction of the wheels of the fixed caster is the cart traveling direction (front-rear direction).

It is a bottom view which shows embodiment of the conveyance trolley | bogie of this invention. It is a top view which shows embodiment of the conveyance trolley | bogie of this invention. It is a bottom view of the corner | angular part which is the principal part which shows embodiment of the carrier truck of this invention. It is a front view of the corner | angular part which is the principal part which shows embodiment of the transport trolley | bogie of this invention. It is the sectional view on the AA line of FIG. 1 which shows embodiment of the conveyance trolley | bogie of this invention. It is the BB sectional drawing of FIG. 1 which shows embodiment of the conveyance trolley | bogie of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Revolving caster 3 Hand bar 4 Frame 5 Corner member 6 Mounting plate

Claims (5)

  In a transport cart that has three wheels on each of the left and right sides in the longitudinal direction of the main body of the rectangular plane, the middle one of the three wheels is outside the two front and rear swivel casters. A transport cart characterized by being arranged in   The transport cart according to claim 1, wherein the middle caster is a turning caster.   The transport cart according to claim 1, wherein the middle caster is a fixed caster that does not turn.   The transport cart according to any one of claims 1 to 3, wherein corner members are attached to the four corners of the cart body so that the lower portion of the hand bar protrudes downward and is inserted.   The carrier cart according to claim 2, wherein a turning range of a middle turning caster among the three-wheel turning casters protrudes outward from both left and right sides of the carriage main body.

Images