JP2007014519A - Trolley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trolley which can easily negotiate a level difference. <P>SOLUTION: An auxiliary wheel 10 with a smaller diameter than a rear wheel in parallel with the rear wheel 2a in the lower part of a rear leg rod 2 is prepared in a position which can be raised in a form that a rotary shaft is on the opposite side of a progress direction to the rotary shaft of the rear wheel 2a and in a form that a front wheel 1a or the front wheel 1a and the rear wheel 2a are not grounded in a condition that the auxiliary wheel 10 is grounded. Moreover, the rotation of the auxiliary wheel 10 is controlled as under one revolution and an elastomer for restoring to the original state after rotation is inserted. Furthermore, a bar member is prepared in the rear leg rod 2 in a way able to rock over the opposite side of the progress direction from the progress direction and in a form that the front wheel 1a and the rear wheel 2a can be raised in an ungrounded form in a condition that the lower edge of the bar member is grounded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a handcart, and more particularly to a handcart capable of overcoming a step.

  A person with weak legs may use a handcart to assist walking or to carry baggage. The user walks while pushing the handcart.

  However, when you walk on a sidewalk while pushing a handcart, you often come across a step. In particular, since a wheelbarrow is generally small in wheel diameter, it is difficult to cross even a step of about 2 cm, and it is necessary for the pusher to pull a pusher such as a handle toward the front to lift the front wheel and cross the step.

  At this time, many handcarts are lightweight and tend to lose balance. Also, since the vehicle cannot move forward with the brakes applied, that is, the step cannot be exceeded, the front wheel must be lifted over the step without applying the brake, and an extra force is applied to lift the front wheel. As a result, the handcart moves forward unexpectedly, and there is a risk that even the pusher will fall if the handcart is pushed.

  In order to avoid such a risk, various handcarts that can overcome a step have been proposed.

As patent documents in which an invention related to such a handcart is described, there are, for example, Japanese Patent Application Laid-Open Nos. 2000-85583 and 2004-344637. The invention described in Japanese Patent Application Laid-Open No. 2000-85583 is provided with a step behind the rear wheel, and the front wheel is lifted and stepped over the step by stepping on the step. The invention described in Japanese Patent Application Laid-Open No. 2004-344637 is a device that can be mounted on an existing wheelchair, and is designed to exceed a step by lifting the front wheel.
JP 2000-85583 A JP 2004-344637 A

    An object of the present invention is to solve the problem of overcoming a step while pushing the handcart, that is, to provide a handcart that can easily get over the step. It is what.

  In order to solve the above problems, the invention according to claim 1 is configured as follows.

  A front leg with a front wheel rotatably at the lower end, a rear leg with a rear wheel rotatably with a lower end and a pusher, and a handcart having at least three members, a rear wheel at the lower part of the rear leg In parallel, an auxiliary wheel having a diameter smaller than that of the rear wheel is configured such that the rotating shaft is on the opposite side of the traveling direction from the rotating shaft of the rear wheel, and the front wheel or the front wheel and the rear wheel are in a state where the auxiliary wheel is grounded. The wheel is provided at a position where it can be lifted in a non-grounding form.

  Further, the handcart according to claim 2 is configured by controlling the rotation of the auxiliary wheel to less than one rotation and interposing an elastic body for restoring the original state after the rotation in the handcart according to claim 1. .

  The handcart described in claim 3 is configured as follows.

  In a handcart with at least three members, a front leg rod with a front wheel rotatably at the lower end, a rear leg rod and a pusher with a rear wheel rotatably at the lower end, and a bar member at the rear leg rod The front wheel and the rear wheel can be lifted so as not to come into contact with each other while being swingable from the direction to the opposite side of the traveling direction and in a state where the lower end of the bar member is in contact with the ground.

  Hereinafter, it will be described with reference to the drawings how the present invention configured as described above has an effect of solving the problems.

  FIG. 1 is a perspective view of the handcart according to claim 1 or 2 as viewed from the opposite side in the traveling direction, FIG. 2 is a perspective view of the same as seen from the traveling direction side, and FIG. FIG. 4 is an explanatory view showing an example of how to attach the auxiliary wheel, FIG. 5 is a front view of the auxiliary wheel in the invention of claim 2, and FIG. FIG. 7 is a cross-sectional view of the auxiliary wheel attached to the rear leg rod, FIG. 7 is an explanatory view showing the swinging state of the bar member, and FIG. 8 is an explanatory view showing various swinging states of the bar member. 9 and 10 are explanatory views showing a state in which the handcart described in claim 1 or 2 goes over the step, and FIGS. 11, 12, and 13 show the state where the handcart goes over the step. It is explanatory drawing which shows the state which goes.

  When the handcart according to claim 1 or 2 collides with the step A as shown in FIG. 9, the pusher (not shown) moves the pusher 3 forward (to its own side), that is, on the opposite side in the traveling direction (see FIG. 9). Pull to the middle right) and lift the front wheel 1a as shown in FIG. In this case, the pusher often applies the brake reflexively. In the handcart of claim 1 and claim 2, when the pusher 3 is pulled forward, the auxiliary wheel 10 is grounded and not only the front wheel 1a but also the rear wheel 2a is slightly lifted. This is because the pusher moves forward and can cross the step A. At this time, by being supported by the auxiliary wheel 10, it is possible to prevent the pusher 3 from being excessively pulled forward. That is, the handcart can be prevented from losing balance.

  In the handcart according to claim 2, the rotation of the auxiliary wheel is controlled to be less than one rotation. Therefore, when the handcart moves forward by pulling the pusher 3 forward and the auxiliary wheel rotates, It will only travel a distance less than the rotation. Thus, since the handcart does not advance excessively, the pusher can be prevented from falling over when the handcart is used.

  When the handcart according to claim 3 collides with the step A as shown in FIG. 11, the pusher (not shown) moves the pusher 3 forward (to its own side), that is, opposite to the traveling direction (right side in the figure). Pull the front wheel 1a as shown in FIG. In this case, the pusher often applies the brake reflexively. In the handcart described in claim 3, when the pusher 3 is pulled forward, the bar member 30 is grounded, and not only the front wheel 1a but also the rear wheel 2a is slightly lifted. Moreover, the bar member 30 is provided so as to be swingable with respect to the rear leg rod 2 from the traveling direction to the opposite side of the traveling direction (from the left side to the right side in the figure). Therefore, the handcart can move forward as shown in FIG. At this time, by being supported by the bar member 30, it is possible to prevent the pusher 3 from being excessively pulled toward the front. That is, the handcart can be prevented from losing balance. Further, if the front wheel 1a is not lifted excessively by restricting the swing angle of the bar member 30, the pushcart will not be moved forward excessively. This can be prevented.

  Thus, according to the present invention, it is possible to easily get over the step, and moreover, if the front wheel is lifted high, it is possible to easily get over the high step that exceeds the wheel diameter. It is possible to provide a handcart.

  As shown in FIGS. 1 to 3, the handcart of any one of claims 1, 2, and 3 is provided with a pair of front leg rods 1 having a front wheel 1 a rotatably provided at the lower end and a rear wheel 2 a rotatably provided at the lower end. A pair of rear leg rods 2 and pushers 3 are provided. The front leg rod 1, the rear leg rod 2 and the pusher 3 described above are connected to each other via a connecting member 5.

  The pusher 3 may be formed of a substantially U-shaped scissor member as shown in FIGS. 1 and 2, or may be formed of a substantially B-shaped scissor member as shown in FIG. . A brake operation bar 4a is provided in parallel with the upper side 3a in the vicinity of the upper side 3a of the pusher 3, that is, in the vicinity of the portion gripped by the pusher. When the brake operation rod 4a is grasped, the wire 4b is pulled, and the brake rod 4c provided so as to be swingable across the pair of rear leg rods 2 and 2 is configured to swing. A contact portion 4d is provided at the end of the brake rod 4c so as to come into contact with or leave the rear wheel 1b as it swings. When the contact portion 4d contacts the rear wheel 2a, the rotation of the rear wheel 2a is controlled and the brake is applied.

2. The handcart described in claim 1 is the handcart described in claim 1, in which the auxiliary wheel 10 having a smaller diameter than the rear wheel 2a is disposed in parallel with the rear wheel 2a at the lower portion of the rear leg rod 2, and the rotating shaft 10a is disposed at the rear. It is provided in a form that comes to the opposite side of the traveling direction from the rotating shaft 2 b of the wheel 2. Here, the parallel means that the traveling direction of the rear wheel 2a and the traveling direction of the auxiliary wheel 10 coincide.

  In addition, the auxiliary wheel 10 is provided at a position where the front wheel 1a or the front wheel 1a and the rear wheel 2a can be lifted up so as not to ground when the auxiliary wheel 10 is grounded.

  As shown in FIG. 1, the auxiliary wheel 10 is attached to the rear leg rod 2 by sandwiching the rear leg rod 2 and the auxiliary wheel 10 with a pair of curved plate members 10b, and the rotating shaft 10a is interposed between the plate members 10b and 10b. An attachment method such as penetration may be employed, or an attachment method in which the vicinity of the lower end of the rear leg rod is curved and the rotation shaft 10a of the auxiliary wheel 10 is caused to penetrate the rear leg rod 2 as shown in FIG.

3. A handcart according to claim 2 The handcart according to claim 2 is provided with an elastic body for controlling the rotation of the auxiliary wheel 20 to less than one rotation and restoring the original state after the rotation. FIG. 5 shows a front view of the auxiliary wheel 20 configured as described above, and FIG. 6 shows a cross-section in a state where the auxiliary wheel 20 is attached to the rear leg 2.

  The auxiliary wheel 20 is provided so as to be rotatable about a rotating shaft 20a that is penetrated together with the rear leg rod 2. A synthetic rubber portion 27 is attached to the outer periphery.

  A concave groove 22 is provided in the auxiliary wheel 20 in a circumferential shape, and a stopper pin 21 that penetrates from the rear leg rod 2 is loosely inserted into the concave groove 22. A contact 25 is provided in the recessed groove 22, and the rotation of the auxiliary wheel 20 is controlled to be less than 1 rotation by the contact of the contact 25 with the stopper pin 21. That is, as shown in FIG. 5, when the auxiliary wheel 20 rotates counterclockwise around the rotating shaft 20a from the state where the stopper pin 21 and the contact 25 are in contact with each other, the contact 25 comes into contact with the stopper pin 21 at a stage of approximately one rotation. Further rotation is prevented. Thus, in the invention according to claim 2, the rotation of the auxiliary wheel 20 is controlled to be less than one rotation.

  The auxiliary wheel 20 is provided with a recess 24 for interposing a winding spring 23 as an elastic body. As shown in FIG. 6, the winding spring 23 is housed in the recess 24, one end of the winding spring 23 is inserted into the hole 2 c provided in the rear leg rod 2, and the other end is inserted into the hole 26 provided in the auxiliary wheel 20. The winding spring 20 is interposed. With such a configuration, the restoring force to return to the original state is generated by the winding spring 23 due to the rotation of the auxiliary wheel 20, and the stage beyond the step, that is, the front wheel 1 and the rear wheel 2 are grounded and the auxiliary wheel 20 is grounded. When the state is released, the auxiliary wheel 20 rotates and returns to the original state, that is, the state in which 25 hits the advancing direction side (left side in the drawing) of the stopper pin 21 as shown in FIG. As a result, the auxiliary wheel 20 is restored to a state in which it can rotate only less than one rotation.

Fourth, the handcart described in claim 3 is provided with a bar member 30 on the rear leg 2 so as to be swingable from the traveling direction to the opposite side in the traveling direction, as shown in FIG. Specifically, the bracket 40 is swingably attached to the rear leg 2 and the rod member 30 is attached to the bracket 40. As shown in FIG. 8, the bracket 40 is provided with a pair of flange portions 41 so as to sandwich the rear leg collar 2, and the bracket 40 and the rear leg collar 2 are allowed to swing by allowing a rotating shaft 42 to pass therethrough. is there.

  A recess 43 is formed between the pair of flanges 41, 41. The recess 43 can adjust the swing range of the bar member 30. That is, the state in which the edge of the recess 43 is in contact with the rear leg 2 is the stage where the bar member 30 is most oscillated in the direction opposite to the traveling direction, so the swing width is changed by changing the size of the recess 43. Is possible.

That is, when the concave portion 43 is large as shown in FIG. 8a, that is, when the concave portion 43 is greatly extended toward the rod member 30, the bar member 30 swings excessively. It is dangerous to move forward. Therefore, it is preferable to fit the rubber plate 50 into the recess 43 as shown in FIG. By fitting the rubber plate 50, the size of the recess 43 is reduced, that is, when the rubber plate 50 comes into contact with the rear leg rod 2 at a stage where it swings at a small angle as shown in FIG. You can control the movement. Of course, it is possible to make the recess 43 smaller by the method of molding the bracket 40 itself without using the rubber plate 50.
In order to reduce the impact at the time of contact, it is preferable to fit a rubber plate.

  A rubber material 31 is fitted into the lower end of the bar member 30. This is to alleviate the impact when contacting the ground.

  The lower end of the bar member 30 is normally pushed forward, that is, when the bar member 30 is swung most in the traveling direction, that is, when the lower end of the bar member 30 is closest to the ground by its own weight. The length of the rod member 30 is provided so as not to contact at a slight distance.

The perspective view which looked at the handcart of Claim 1 or 2 from the advancing direction opposite side. The perspective view similarly seen from the advancing direction side. The perspective view which looked at the handcart of Claim 3 from the advancing direction opposite side. Explanatory drawing which shows an example of how to attach an auxiliary wheel. The front view of the auxiliary wheel in invention of Claim 2. Sectional drawing of the state which attached the auxiliary wheel to the rear leg rod. Explanatory drawing which shows the rocking | fluctuation state of a bar member. Explanatory drawing which shows the various rocking | fluctuation states of a rod member. Explanatory drawing which shows the state in which the handcart which concerns on this invention gets over a level | step difference. Explanatory drawing which shows the state in which the handcart which concerns on this invention gets over a level | step difference. Explanatory drawing which shows the state in which the handcart which concerns on this invention gets over a level | step difference. Explanatory drawing which shows the state in which the handcart which concerns on this invention gets over a level | step difference. Explanatory drawing which shows the state in which the handcart which concerns on this invention gets over a level | step difference.

Explanation of symbols

1 .. Front foot rod 1a. Front wheel 2 Rear foot rod 2a Rear wheel 3 Pusher 10, 20 Auxiliary wheel 30 Bar

Claims (3)

 A front leg with a front wheel rotatably at the lower end, a rear leg with a rear wheel rotatably with a lower end and a pusher, and a handcart having at least three members, a rear wheel at the lower part of the rear leg At the same time, the auxiliary wheel having a smaller diameter than the rear wheel is arranged such that the rotating shaft is on the opposite side of the traveling direction from the rotating shaft of the rear wheel, and the front wheel and the rear wheel are in the state where the auxiliary wheel is grounded. A handcart provided in a position where it can be lifted to a form that does not touch the ground.   The handcart according to claim 1, further comprising an elastic body for controlling the rotation of the auxiliary wheel to less than one rotation and restoring the original state after the rotation.   In a handcart with at least three members, a front leg rod with a front wheel rotatably at the lower end, a rear leg rod and a pusher with a rear wheel rotatably at the lower end, and a bar member at the rear leg rod A handcart provided in a form that can swing from the direction to the opposite side of the traveling direction and that can lift the front and rear wheels into a form that does not come into contact with the lower end of the bar member in contact with the ground.

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