JP2012217816A - Positional relationship among frame, grip, and wheels in four-wheel cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the conventional four-wheel cart problem that the cart is inclined to yaw right and left relative to the direction of advance or the cart is inclined to fall forward in the direction of advance when the road is rough with concave and convex, so it is difficult to go straight and it is difficult for a cart operator to walk since the bag or casters of the cart hit the foot of the operator.SOLUTION: Instability in right and left is suppressed by employing fixed wheels for at least two rear wheels and setting the attachment position of a grip before the position of each front wheel. Besides, falling forward action is reduced by arranging the grip in a lower position. In addition, the grip is arranged to be coupled directly with the leftmost frame or rightmost frame of the cart to prevent contact with the foot of the cart operator.

Description

  The present invention relates to a positional relationship between a frame, a grip, and wheels of a cart that allows goods to be carried together to smoothly move on a road surface during travel, commuting, shopping, and the like.

  Many carts have been used in which four wheels whose directions are freely changed are brought into contact with the road surface, and the wheels are rotated to move parallel to the road surface. This is shown in FIG.

  In this type of cart, the grip 21 that generally extends the handle 24 is pushed in the traveling direction to move the cart.

  However, with this type of cart, it may be difficult to always go straight in the direction of travel. In particular, when the unevenness of the road surface is severe, the phenomenon that the cart swings left and right with respect to the traveling direction is likely to occur. In addition, the phenomenon of picking up in the traveling direction is likely to occur. Therefore, it becomes difficult to smoothly advance straight.

  The problems of the conventional four-wheel cart described above are as follows.

  First, the four wheels are directional wheels. Because the direction is free, the cart easily swings to the left and right when traveling. For this reason, even if the operator tries to go straight, it often happens that straight running cannot be performed smoothly.

  Secondly, as shown in FIG. 3, the grip 31 attached to the handle 34 is placed at a position rearward in the horizontal direction from the position of the front wheel. Therefore, the hand of the cart operator grips the grip located rearward from the front wheel. When the grip is pushed in the traveling direction, a rotational force is generated in the horizontal direction in the cart, which makes it easy to swing left and right.

  Third, the grip must be placed at a relatively high ground level. Therefore, when the grip is pushed in the traveling direction, the rotational force in the traveling direction is increased, and the cart and the bag are easily picked forward.

  Fourth, grips shaped like 31 in FIG. 3 are not adequate enough to advance the cart in the direction of travel. With this shape, it is difficult to apply force in the direction of travel.

  Fifth, as shown in FIG. 4 (FIG. 4 is a front view of the cart operator walking while operating the cart), the grip portion is located near the center of the bag. In addition, the heel or cart wheel may come into contact with the operator's feet and interfere with the operator's walking and movement. Therefore, it becomes difficult for the cart operator to walk smoothly while moving the cart.

  As for the above-mentioned problem [0006], at least the two rear wheels are made to be wheels that do not change direction (called fixed wheels) and are mounted on the cart bottom surface only in the traveling direction (Claims 1 and 2). As a result, left and right wobbling can be reduced.

  As for the above-mentioned problem [0007], as shown in FIG. 5, the grip is set to the position of the grip 51 which is positioned in front of the position of the front wheel (claim 3). By disposing the grip in this way, generation of rotational force in the horizontal direction can be suppressed as much as possible even when the grip is pushed in the traveling direction. As a result, it is possible to reduce the wobbling of the cart from side to side.

The problem [0008] is that the grip 51 (FIG. 5) is arranged as low as possible (Claim 3). By arranging the grip at a low position, the rotational force generated in the vertical direction can be reduced.
Another method for reducing the rotational force generated in the vertical direction is to make the front wheel collide with the convex portion of the road surface as much as possible. This is because the reason why the rotational force is generated in the vertical direction is the unevenness of the road surface, and the wheel collides with the convex surface and the reaction force generates the rotational force. To prevent the wheel from colliding with the convex surface, the front wheel is lifted slightly upward from the ground. In order to be able to lift the front wheel slightly upward depending on the unevenness of the road surface, it is necessary to arrange the grip at a position where it can be easily lifted upward. Lowering the grip position makes it easier to lift. That is, it is possible to reduce picking up by disposing the grip at a low position.

  Regarding the above problem [0009], the shape of the grip should be a shape that can be sufficiently pushed in the traveling direction. On the other hand, when considering the solution of [0013], the shape of the grip is preferably easy to pull in the traveling direction and easy to lift in a timely manner. For this purpose, a shape that is inclined downward in the traveling direction as in the grip 61 of FIG. 6 is formed (claim 3).

  Regarding the above problems [0009] and [0010], a grip is directly connected to the frame on the right end of the bag in the traveling direction as shown in FIG. For a user who wants to operate the cart with the right hand, the grip is directly connected to the frame on the left side in the traveling direction of the bag (Claim 4). By doing so, the possibility that the foot comes into contact with the cart or the heel can be reduced.

  The present invention is not a mold for pushing a cart, but a mold for pulling. Therefore, it is possible to reduce the left and right runout with respect to the traveling direction as compared with the conventional four-wheel cart. In addition, the phenomenon of picking up in the traveling direction can be reduced.

  Since the present invention attaches the grip to the right end or the left end with respect to the traveling direction of the kite, if the grip is pulled, the cart may turn left or right without moving straight. Absent. In practice, however, it is unlikely. Because the cart and the cage itself have their own weight, the friction between the road surface and the wheels is large, and because the two rear wheels fixed in the direction of travel are equipped, it turns left or right Can be reduced.

  Conventionally, a hand-held shopping cart having a form similar to a stroller has been used for a four-wheeled cart. Compared to this, the biggest difference is that the hand-held shopping cart has to be pushed with both hands, whereas the present invention can run with one hand. When the road surface is smooth, you can run with one finger as well as one hand.

  In the present invention, since the fixed type wheel is disposed at least on the rear wheel, it may seem that the cart only moves straight and is difficult to change direction. However, the present invention is a pulling system, and the turn of the front wheel portion of the cart can be lifted slightly upward so that turning is not so difficult.

  Because of the effects as described above, the present invention can be used not only as a bag for travel and shopping but also as a bag for commuting.

The perspective view of the four-wheel cart (for left-handed operators) showing the embodiment of the present invention A diagram of a person operating a four-wheel cart that is often seen in the past Perspective view of a conventional 4-wheel cart A diagram of a person operating a four-wheel cart that is often seen in the past The figure of the four-wheel cart used as the origin of the four-wheel cart of this invention The perspective view of the four-wheel cart which shows embodiment of this invention (equal to FIG. 1) The figure which the person operates the four-wheel cart of this invention with the left hand Another view of the four-wheel cart embodiment of the present invention Another alternative view of the four-wheel cart embodiment of the present invention.

  The following are examples of embodiments of the present invention.

  The two wheels arranged at the rear corners need to be fixed wheels, but the wheels arranged at the front corners may be fixed or rotary.

  Four wheels are mounted on the bottom surface, one at each of the four corners of the bottom surface, and five or more wheels may be mounted on the bottom surface.

  The grip may also be used as a frame. In other words, as shown in FIG. 8, if the frame is bent obliquely downward and the part can be gripped by hand, it is not always necessary to attach the grip specially.

  If the grip portion and the frame portion directly connected to the grip portion are tilted forward as shown in FIG. 9, the picking can be further reduced. This is because the fulcrum for pulling the cart can be placed at a lower position, thereby further reducing the rotational force in the traveling direction.

11, 21, 31, 41, 51, 61, 71, 81, 91 ... grip 12, 82, 92 ... cart frame 13, 23, 33, 43, 53, 63, 73, 83, 93 .. 鞄 24, 34, 44, 74 ... Cart handle 15, 45, 75, 85, 95 ... Wheel (front wheel)
16, 26, 86, 96 ... wheels (rear wheels)

Claims (4)

  Cart with four wheels mounted at least at the four corners of the bottom of the cart, ie two wheels 15 (FIG. 1), one at each left and right corner, and two wheels 16 (FIG. 1), one at each left and right corner . Two wheels 15 attached to the front in the traveling direction are referred to as front wheels, and two wheels 16 attached to the rear are referred to as rear wheels.   At least two of the rear wheels 16 (FIG. 1) do not rotate at an angle deviating from the straight direction, and are carts equipped with fixed wheels that always move in the straight direction.   For a user who wants to operate the cart with his left hand, the cart frame 12 (FIG. 1) extends upward in the front wheel on the right side in the direction of travel, and a grip 11 which is directly connected to the cart and faces obliquely downward in the direction of travel. For carts with (Fig. 1) or those who want to operate the cart with the right hand, the cart frame extending upward on the left front wheel in the direction of the groove, and diagonally downward in the direction of travel A cart with a grip.   For users who want to operate the cart with their left hand, as shown in Fig. 1, a cart with a grip directly connected to the frame at the right end of the bag in the direction of travel. For users who want to operate the cart with their right hand, a cart with a grip directly connected to the frame on the left side in the direction of travel of the kite.

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