JP2005313873A - Hand cart - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hand cart capable of reducing a physical burden when a transfer person rises steps or the like, attaining excellent traveling on a flat road, and contributing to an improvement in safety for the transfer person by a simple structure. <P>SOLUTION: This hand cart 1 has a handle device 110, a base 120 for attaching the handle device or the like, a traveling wheel 2, and a placement portion 3. Wheel constituting bodies 201, 202 are disposed on the traveling wheel 2 in the width direction, the traveling wheel is rotated with a wheel shaft centered, and formed so that a rotational angle may become 22.5°. Cut portions 211 formed at eight portions of outer peripheries of the wheel constituting bodies 201, 202 at a constant interval so as to sandwich the wheel shaft and face with each other are cut and formed so as to be formed into a fan shape having the bottom of a recess portion at 90° in a side view over the overall width of the respective outer periphery surfaces of the wheel constituting bodies 201, 202. The outer periphery surface between the respective cut portions 211 constitutes a ground contact surface 212, and an orbit formed of the respective contact surfaces 212 is formed so as to be a circle. The wheel constituting body 201 is provided with a rotation stopper 230. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hand cart. More specifically, the present invention relates to a hand cart that is safe and reduces the physical burden on a carrier when an article is loaded and climbs a step, and has good traveling performance even on a flat road.

  Conventionally, a hand cart is used as an article conveying means. If the hand cart is used, the article can be transported with less force than the case of directly holding or carrying the article, thereby reducing the physical burden on the transporter. In particular, the effect is remarkable when transporting heavy objects. For this reason, hand carts are widely used by women and the elderly

However, if the hand cart has a step such as a staircase (hereinafter referred to as “staircase”) during use, the tire of the hand cart is too small to get over the step, or the tire slips difficult to climb the step. There was a problem.
In such a case, the transporter lifts and climbs the entire hand cart loaded with the articles, or removes the articles from the hand cart and climbs separately, which is a physical burden on the transporter.

Therefore, in order to reduce the physical burden on the carrier, a step-operated handcart as shown in Patent Document 1 has been proposed. When using this step-operated handcart, you can climb stairs while towing the step-operated handcart. Can do.
JP2002-19616

However, the step-operated handcart according to Patent Document 1 requires a traveling wheel at each end of the support rod formed in a cross shape, and there is a problem that the number of components increases.
In addition, when the stepped barrow is running on a flat road, the portion of the cross-shaped support rod that is located above the axle connecting horizontal bar is not in use, so that the portion is bulky and the appearance is not uniform. There was a problem of being bad.
Furthermore, since the step-operated handcart rotates with the cruciform support rod in contact with the tread surface and the kick-in, the step lifting wheel provided at the end of the support rod is outside the same extent as the thickness of the support rod. Only diameters can be used. Such a small-diameter wheel is likely to be caught by fine irregularities when traveling on a flat road, and there is a problem that traveling performance is not good.

Therefore, there is also an idea of using tires having a large number of ridges perpendicular to the vehicle traveling direction on the peripheral surface, which is proposed in a luggage transporting stair climbing vehicle shown in Patent Document 2 below. The tire having the above structure has good running performance on steps and flat roads, and can easily carry articles.
In addition, it is preferable that the tire has a lower air pressure when climbing stairs, etc., so that the corners related to the steps are easy to bite, while the air pressure is higher when climbing stairs than when climbing stairs. Therefore, it is necessary to adjust the air pressure.
For this reason, the luggage transporting stair climbing vehicle described in the example of Patent Document 2 includes a tire air pressure adjusting device.
JP-A-4-353085

However, when the above tire is a simple hand cart wheel that an individual uses to carry baggage, there are the following problems.
That is, when a tire is evacuated when climbing stairs and moving on a flat road as it is, the ground contact area of the tire increases and resistance increases, so that the carrier needs a lot of force to pull the hand cart.
On the other hand, it is troublesome to evacuate the tires when climbing stairs or the like, and to refill the tires every time when moving on a flat road.
In addition, when the tire pressure adjusting device is provided in the hand cart in order to eliminate the labor, the weight of the entire hand cart increases and the manufacturing process becomes complicated.

(Object of invention)
An object of the present invention is to provide a hand cart that reduces the physical burden when a carrier climbs stairs and the like while having a simple structure, and has good traveling performance even on a flat road, and helps improve the safety of the carrier. There is.

Means taken by the present invention to achieve the above object are as follows.
In the first invention,
A hand cart with wheels,
A required number of recesses are formed at equal intervals from the outer peripheral part of the circular wheel toward the center, and the remaining part is a ground contact surface,
The concave portion is formed to receive a corner portion formed by the tread surface and the kick of the stairs,
The remaining ground contact surface constitutes the traveling circumferential surface of the wheel, and the trajectory formed by the traveling circumferential surface during traveling is formed to have a circular shape,
It is a hand cart.

In the second invention,
A hand cart with wheels,
The wheel is configured so that the shape of the outer periphery can be changed,
It is a hand cart.

In the third invention,
When running on stairs, a recess is formed that accepts a corner formed by the tread of the stairs and a kick, and at other times, the outer periphery is provided with wheels configured to form a circular shape,
It is a hand cart.

In the fourth invention,
It has the required number of wheel components arranged in the width direction, and the shape of the outer periphery of the wheel can be changed by shifting the wheel components,
This is a hand cart wheel.

In the fifth invention,
A hand cart for conveying an article, comprising a handle, a placement part for the article, and a traveling wheel;
Each traveling wheel is configured by arranging two or more wheel constituent members formed in a substantially disc shape in the width direction,
The outer diameter of each running wheel is formed to be the same or essentially the same or larger than the height of the stairs and the like,
A plurality of recesses formed so that corners such as stairs are fitted and engaged over the entire width or a part in the width direction are provided at required positions on the outer periphery of each wheel component member, and the outer periphery between the recesses is in contact with each other. Composing the ground,
Each ground contact surface constitutes the traveling circumferential surface of the wheel, and the trajectory formed by the traveling circumferential surface during traveling is formed to have a circular shape,
The wheel component is formed to be able to rotate at a required angle around the axle,
When each wheel component member is rotated, the shape of the outer peripheral surface of the traveling wheel that appears due to the combination of each concave portion formed on the outer periphery and each ground surface changes,
One shape relating to the outer peripheral surface of the traveling wheel is a shape in which the concave portions related to the respective wheel constituent members match each other in the width direction, and in the outer periphery of the traveling wheel, the concave portion and the ground contact surface are intermittently continuous.
The other shape related to the outer peripheral surface of the traveling wheel is characterized in that the concave portions and the grounding surfaces related to the respective wheel constituent members are alternately positioned in the width direction, and the grounding surfaces are continuous or essentially continuous. ,
It is a hand cart.

In the sixth invention,
Means for stopping each rotating wheel component member at a required position is formed,
It is a hand cart concerning the 5th invention.

In the seventh invention,
It is provided with a reverse rotation prevention or stop means for the traveling wheel, and a reverse rotation release means,
A hand cart according to the first, second, third, fifth or sixth invention.

In the eighth invention,
The traveling wheels are a pair of left and right,
A hand cart according to the first, second, third, fifth, sixth or seventh invention.

  Examples of the “recesses relating to the traveling wheel” referred to in the present specification and claims include, for example, those in which the bottom part of the recess is cut out in a sector shape of 90 ° in a side view. For example, it may be a V-shaped, U-shaped, saddle-shaped or other known shape having an opening, or may be a recess that is essentially a recess. The thing etc. which were done may be sufficient.

  As used herein, the term “reverse rotation prevention means” refers to a means for preventing the traveling wheel from rotating only in the forward direction and rotating backward, for example, a gear provided on the traveling wheel and an urging force. It is made to rotate only in one direction by the locking claw made, and when the traveling wheel tries to reversely rotate, the claw is pushed between the gear teeth and the wheel is stopped to rotate, etc. It is not limited to this, and may be other known means for preventing reverse rotation. The “reverse rotation stopping means” is, for example, a device that operates a brake body with a wire to stop a traveling wheel like a bicycle brake, and has a handle device provided with a brake lever. However, the present invention is not limited to this, and other known means for stopping the reverse rotation may be used.

  The “means for stopping each rotating wheel structure at a required position” in the present specification and claims includes, for example, a locking pin and a ring, a spring, and an engaging groove. The engaging pin engaged with the engaging groove and the engaging groove engage with each other, and the rotating wheel components are stopped at a required position. Other known means may be used.

  In the claims, each constituent element of the present invention will be described in correspondence with the reference numerals given to the respective parts in the embodiments described later. However, it does not mean that the constituent elements are limited to the above-described parts.

(Work)
First, the article is placed on the placement portion of the hand cart.
The required number of recesses are formed at equal intervals from the outer peripheral part of the circular wheel toward the center, the remaining part is a ground contact surface, and the recess accepts the corner formed by the tread surface and kicking of the stairs The hand cart characterized in that the remaining ground contact surface constitutes the traveling circumferential surface of the wheel and the trajectory formed by the traveling circumferential surface during traveling is formed in a circular shape. When towing and climbing, the notch and the ground contact surface are intermittently positioned on the outer periphery of the traveling wheel, and the notch engages or becomes easy to engage with the corner when climbing over the stepped portion of the staircase. Is difficult to slide down.
Also, when towing on a flat road, each ground contact surface associated with each traveling wheel constitutes the traveling peripheral surface of the wheel, and the trajectory formed by the traveling peripheral surface during traveling is circular, and the continuity of the ground contact surface is maintained. Therefore, it becomes difficult to get caught by small obstacles scattered on a flat road.

The wheel is a hand cart that can change the shape of the outer periphery.When running on stairs, a recess is formed that accepts the corner formed by the tread surface and the kick of the stairs. For hand carts equipped with wheels configured to make, when climbing stairs, etc., a recess is formed to accept the corner formed by the tread surface of the stairs and the kick, and when traveling over the kick, the traveling wheel ground plane The formed recess engages with or easily engages with a corner such as a staircase, and the traveling wheel is less likely to slide down.
In addition, when using the hand cart on a flat road, the outer periphery of each traveling wheel of the hand cart is circular, so that the continuity of the ground contact surface is maintained and the obstacle is scattered on small obstacles scattered on the flat road. It becomes difficult.

For handcart wheels that have the required number of wheel components arranged in the width direction and that can change the shape of the outer periphery of the wheels by shifting the wheel components, the wheel configuration when climbing stairs etc. A recess that receives the corner formed by the tread surface and the kick of the stairs is formed by displacing the member, and the recess formed on the traveling wheel ground contact surface engages with the corner of the stairs when overcoming the kick, Or it becomes easy to engage and a traveling wheel does not slide down easily.
Further, when the hand cart wheel is used on a flat road, the outer periphery of each traveling wheel is formed in a circular shape by shifting the wheel constituent members, and the continuity of the ground contact surface is maintained and scattered on the flat road. It becomes difficult to get caught by small obstacles.

Each traveling wheel is configured by arranging two or more wheel constituent members formed in a substantially disk shape in the width direction, and the outer diameter of each traveling wheel is equal to or substantially equal to the height of a kick such as stairs. A plurality of recesses formed so that corners such as stairs are fitted and engaged over the entire width or a part in the width direction are provided at required positions on the outer periphery of each wheel component member, and the outer periphery between the recesses is formed. The ground is composed of a ground contact surface, and each ground contact surface constitutes a traveling circumferential surface of the wheel, and the trajectory formed by the traveling circumferential surface during traveling is formed in a circular shape. When each wheel component member is formed to be movable, the shape of the outer peripheral surface of the traveling wheel that appears due to the combination of each concave portion formed on the outer periphery and each ground contact surface changes, and one shape related to the outer peripheral surface of the traveling wheel The recesses on each wheel component are aligned with each other in the width direction. In the outer periphery of the traveling wheel, the concave portion and the ground contact surface are intermittently continuous, and the other shapes related to the outer peripheral surface of the traveling wheel are configured such that the concave portion and the ground contact surface related to each wheel component member are alternately positioned in the width direction. For hand carts that have a continuous or essentially continuous shape, when climbing stairs, etc., make sure that each recess and ground contact surface are aligned in the width direction before use. And the recesses and the circumferential surface are intermittently arranged on the outer periphery of the traveling wheel.
In a hand cart in which means for stopping each rotating wheel structure at a required position is formed, each wheel structure is stopped at a required position by the means. After that, the carrier climbs the step first, and then climbs the stairs while pulling the hand cart.
Further, on a flat road, before use, the wheel structure related to the traveling wheel is rotated by a required angle around the axle. Specifically, the concave portions and the ground contact surfaces related to each wheel component are alternately positioned in the width direction, and the contact surfaces are continuously or essentially continuous.
In a hand cart in which means for stopping each rotating wheel structure at a required position is formed, each wheel structure is stopped at a required position by the means. Thereafter, the hand cart is pulled or pushed to convey the article.

The traveling wheel has an outer diameter that is equal to, essentially equal to, or larger than the height of the kick such as a staircase, and thus is easy to get over the kick.
In addition, when climbing over the kicking, a plurality of recesses over the entire width or part of the width direction provided at required locations on the outer periphery of each wheel structure engage with corners such as stairs, and the traveling wheels slide down at the corners. Hard to do.

  In the hand cart provided with the reverse rotation prevention or stop means and the reverse rotation release means of the traveling wheel, the hand cart does not reversely move down the stairs.

The present invention has the following effects.
The required number of recesses are formed at equal intervals from the outer peripheral part of the circular wheel toward the center, the remaining part is a ground contact surface, and the recess accepts the corner formed by the tread surface and kicking of the stairs The hand cart characterized in that the remaining ground contact surface constitutes the traveling circumferential surface of the wheel and the trajectory formed by the traveling circumferential surface during traveling is formed in a circular shape. When towing and climbing, the notch and the ground contact surface are intermittently positioned on the outer periphery of the traveling wheel, and the notch engages or becomes easy to engage with the corner when climbing over the stepped portion of the staircase. Is difficult to slide down. For this reason, the transporter who uses a hand cart can climb a level | step difference safely also on stairs etc., and can reduce a physical burden.
Also, when towing on a flat road, each ground contact surface associated with each traveling wheel constitutes the traveling peripheral surface of the wheel, and the trajectory formed by the traveling peripheral surface during traveling is circular, and the continuity of the ground contact surface is maintained. Therefore, it becomes difficult to get caught by small obstacles scattered on a flat road. For this reason, the traveling property on a flat road is good, and the physical burden on the carrier can be reduced.

The wheel is a hand cart that can change the shape of the outer periphery.When running on stairs, a recess is formed that accepts the corner formed by the tread surface and the kick of the stairs. For hand carts equipped with wheels configured to make, when climbing stairs, etc., a recess that accepts the corner formed by the tread surface of the stairs and the kick is formed, and when traveling over the kick, the traveling wheel ground plane The formed recess engages with or easily engages with a corner such as a staircase, and the traveling wheel is less likely to slide down. For this reason, the transporter who uses the hand cart according to the present invention can safely climb the steps even on stairs and the like.
In addition, when using the hand cart on a flat road, the outer periphery of each traveling wheel of the hand cart is circular, so that the continuity of the ground contact surface is maintained and the obstacle is scattered on small obstacles scattered on the flat road. It becomes difficult. For this reason, runnability is good and the physical burden on the carrier can be reduced.

For handcart wheels that have the required number of wheel components arranged in the width direction and that can change the shape of the outer periphery of the wheels by shifting the wheel components, the wheel configuration when climbing stairs etc. A recess that accepts a corner formed by the tread of the staircase and the kick is formed by displacing the member, and the recess formed on the traveling wheel grounding surface engages with the corner of the staircase when overcoming the kick. Or it becomes easy to engage and a traveling wheel does not slide down easily. For this reason, the transporter who uses the hand cart according to the present invention can safely climb the steps even on stairs and the like.
Further, when the hand cart wheel is used on a flat road, the outer periphery of each traveling wheel is formed in a circular shape by shifting the wheel constituent members, and the continuity of the ground contact surface is maintained and scattered on the flat road. It becomes difficult to get caught by small obstacles. For this reason, runnability is good and the physical burden on the carrier can be reduced.

  Each traveling wheel is configured by arranging two or more wheel constituent members formed in a substantially disk shape in the width direction, and the outer diameter of each traveling wheel is equal to or substantially equal to the height of a kick such as stairs. A plurality of recesses formed so that corners such as stairs are fitted and engaged over the entire width or a part in the width direction are provided at required positions on the outer periphery of each wheel component member, and the outer periphery between the recesses is formed. The ground is composed of a ground contact surface, and each ground contact surface constitutes a traveling circumferential surface of the wheel, and the trajectory formed by the traveling circumferential surface during traveling is formed in a circular shape. When each wheel component member is formed to be movable, the shape of the outer peripheral surface of the traveling wheel that appears due to the combination of each concave portion formed on the outer periphery and each ground contact surface changes, and one shape related to the outer peripheral surface of the traveling wheel The recesses on each wheel component are aligned with each other in the width direction. In the outer periphery of the traveling wheel, the concave portion and the ground contact surface are intermittently continuous, and the other shapes related to the outer peripheral surface of the traveling wheel are configured such that the concave portion and the ground contact surface related to each wheel component member are alternately positioned in the width direction For hand carts that have a continuous or essentially continuous shape, when climbing stairs, etc., match each recessed portion and each grounding surface of each traveling wheel component so that they are aligned in the width direction. By positioning the recesses and the circumferential surface intermittently on the outer periphery of the traveling wheel, the recesses formed on the traveling wheel grounding surface engage with the corners of the stairs and the like when overcoming the staircase kicking. Or it becomes easy to engage, and the traveling wheel is difficult to slide down. Further, since the outer diameter of the traveling wheel is formed to be equal to, essentially equal to, or larger than the height of the kick such as the stairs, it is easy to get over the kick and reduce the physical burden on the carrier. For this reason, the transporter who uses the hand cart according to the present invention can safely climb the steps even on stairs and the like.

  In addition, when using the hand cart on a flat road, the concave portions and the ground contact surfaces related to the wheel components are alternately positioned in the width direction before use so that the contact surfaces are continuous or essentially continuous. By doing so, the continuity of the ground contact surface is maintained and it becomes difficult to get caught by small obstacles scattered on the flat road. In addition, since the outer diameter of the running wheel is formed to be equal to, essentially equal to or larger than the height of the stairs, etc., it is easy to get over small obstacles scattered on flat roads and fits into low steps. Hateful. For this reason, runnability is good and the physical burden on the carrier can be reduced.

  In a hand cart in which means for stopping each rotating wheel structure at a required position is formed, each wheel structure is stopped at a required position by the means and each wheel structure is used during use. Since the position of the recessed part etc. which concerns on a body does not shift | deviate, a driving | running | working wheel does not slide down in a corner | angular part or it is hard to slide down. For this reason, the safety of the carrier who uses the hand cart is further improved.

  A vehicle equipped with a reverse rotation prevention or stop means and reverse rotation release means for traveling wheels does not reversely run in the downward direction even when stopped on a slope or staircase, thereby improving safety during transportation. Further, even when the vehicle stops on a slope or stairs, the force required to pull the handle is small. For this reason, the physical burden on the carrier can be reduced.

  Since the traveling wheel has a simple structure with a recess, the number of parts can be reduced, and the manufacturing cost can be reduced. In addition, the appearance is well organized.

FIG. 1 is a perspective explanatory view of a hand cart according to a first embodiment of the present invention,
FIG. 2 is an enlarged explanatory view showing a traveling wheel portion of the hand cart according to the first embodiment of the present invention.
With reference to FIG.1 and FIG.2, the hand cart 1a which concerns on 1st Embodiment is demonstrated.

  The hand cart 1 a includes a handle device 110, a handle device mounting base 120, a traveling wheel 2 a, and a placement portion 3. The hand cart 1a is mainly made of an aluminum alloy except for the tire of the traveling wheel 2a.

The handle device 110 includes a handle 111, a pair of guide members 112, and a horizontal frame member 113.
The handle 111 is formed in a gate shape by bending a circular pipe. Note that the handle 111 is formed by bending both side portions of the handle 111 obliquely upward in the rear direction from a required position.
Each guide member 112 is formed in a substantially quadrangular prism shape, and a protrusion is provided at each corner. The lower end portions of the handle 111 and the upper end portions of the guide members 112 are fixed.
The horizontal frame member 113 is fixed in a horizontal manner between the vicinity of the fixed portions of the handle 111 and the guide member 112. Further, the horizontal frame member 114 is fixed to the substantially intermediate portion of each guide member 112 in a horizontal manner.

The handle device mounting base 120 is composed of a lateral frame member 121 and a pair of rail members 122.
Each rail member 122 is formed in the shape of a square cylinder and is provided so as to oppose left and right. Each rail member 122 is formed in such a size that each of the above-described guide members 112 is just contained therein.
The opposing surfaces of the rail members 121 are provided with notches over substantially the entire length in the height direction. The width of the notch is substantially the same as the thickness of the horizontal frame members 113 and 114.
The horizontal frame member 121 is fixed to the upper end portion of each rail member 122 in a horizontal manner.

Each traveling wheel 2a is attached to a traveling wheel mounting base 220, and the traveling wheel mounting base 220 is provided on the back side of the lower portion of the mounting base 120 such as a handle device.
The traveling wheel mounting base 220 is formed by bending a plate-like body in a top view, and the traveling wheels 2a are provided facing each side.
In the present embodiment, the traveling wheel 2a is formed with a diameter of about 28 cm.
The traveling wheels 2a are rotatably provided respectively, and no axle is passed between the traveling wheels.

The traveling wheel 2a is formed of a synthetic resin material.
A plurality of notches 211 are provided on the outer periphery of the traveling wheel 2a.
The notches 211 are provided at equal intervals in a total of eight locations on the outer periphery of the traveling wheel 2a, and are positioned so as to face each other across the axle.
Each notch 211 has a fan-shaped notch portion whose bottom portion of the recess is 90 ° in a side view over the entire width of each outer peripheral surface of the traveling wheel 2a.

The outer peripheral surface sandwiched between the notches 211 constitutes a ground contact surface 212.
Each ground contact surface 212 constitutes the traveling circumferential surface of the traveling wheel 2a, and the trajectory formed by the traveling circumferential surface during traveling is formed in a circular shape. (See Figs. 2 and 3)

  A gear 213 is provided on the traveling wheel mounting base 220 side of the traveling wheel 2. Each tooth of the gear 213 is formed in a mountain shape in a side view projecting in the circumferential direction and inclined downward toward the forward rotation direction.

The locking claw 221 is provided between the traveling wheel mounting base 220 side and the traveling wheel 2. One end of the locking claw 221 is pivotally attached to the traveling wheel mounting base 220 and the other end is engaged with the gear 213. (See Figure 2)
The locking claw 221 is urged toward the gear 213 by the urging means, but the illustration of the urging means is omitted.

The mounting unit 3 includes a mounting table 310 and a bearing unit 320.
The mounting table 310 is formed in a rectangular plate-like body, and a bearing portion 320 is provided in one longitudinal portion.
The bearing portion 320 is provided below the handle base and the like mounting base 120 and at a position sandwiched between the rail members 120.
The mounting portion 3 is provided so as to be axially movable in the direction of the arrow shown in FIG.

(Work)
FIG. 3 is an explanatory diagram of the usage state of the hand cart according to the first embodiment of the present invention.
The operation of the hand cart 1a will be described with reference to FIGS.

Please refer to FIG. First, the luggage 4 is placed on the placing table 310 related to the hand cart 1a.
On a flat road, like a conventional hand cart, the hand cart is pulled or pushed to convey the article.

In the hand cart 1a, each ground contact surface 212 associated with each traveling wheel 2a constitutes the travel peripheral surface of the wheel 2a, and the trajectory formed by the travel peripheral surface during travel is circular, and the continuity of the ground contact surface 212 is maintained. Therefore, it becomes difficult to get caught by small obstacles scattered on a flat road.
Moreover, the traveling wheel 2a formed with a diameter of about 28 cm is easy to get over small obstacles scattered on a flat road, and is difficult to fit into a low step or the like. Furthermore, since the traveling wheels 2a can be rotated independently of each other, a small turn is effective when the direction is changed.
For this reason, the traveling property on a flat road is good, and the physical burden on the carrier can be reduced.

  If the handle device 110 is slid up and down to adjust the handle 111 to a suitable position in accordance with the size of the load 4 to be loaded, the height of the carrier, etc., the posture of the carrier becomes easier during transportation and the physical burden is reduced. Can be reduced.

With reference to FIG. 3, the case where it climbs stairs etc. is demonstrated.
The staircase or the like is composed of a kicking part 51, a tread surface part 52, and a corner part 53, and the height of the kicking part 51 is generally about 18 to 25 cm.

First, the carrier first climbs the stairs and the like and pulls the hand cart 1a to climb.
In the hand cart 1a, the notch portion 211 and the ground contact surface 212 are intermittently positioned on the outer periphery of each traveling wheel 2a, and the notch portion 211 engages or engages with the corner portion 53 when getting over the stepped kick portion 51. Since it becomes easy, the traveling wheel 2 is hard to slide down.
Moreover, since the traveling wheel 2 formed with a diameter of about 28 cm is formed to be equal to or larger in diameter than the height of the kick 51, the traveling wheel 2 can easily get over the kick portion 51 of the stairs.
For this reason, the transporter who uses the hand cart 1 can safely climb the steps even on stairs and the like, and can reduce the physical burden.

Further, when climbing the stairs, the hand cart 1a can move forward, but when the traveling wheel 2a starts to reversely rotate, the locking claw 221 engages with the gear 213 and the rotation stops so that the traveling wheel stops rotating. Or since the stop means is provided, the hand cart 1a does not run backward under the stairs. For this reason, when stopping in the middle of a staircase etc., it is not necessary to always pull the hand cart 1a with force, and the physical burden on the carrier is reduced. In addition, it is possible to prevent the vehicle from running backward in the downward direction of the stairs and the like, so that the safety during the work of the carrier is also improved.
In addition, the hand cart 1a contributes to the reduction of the physical burden on the carrier and the improvement of work safety by the same action as described above even on a slope.

  After use, the hand cart 1a is not bulky during storage if the handle device 110 is contracted and the placing portion 3 is folded and stored. (See the imaginary line in Figure 1)

  Since the traveling wheel has a simple structure with a recess, the number of parts can be reduced, and the manufacturing cost can be reduced. In addition, the appearance is well organized.

FIG. 4 is a perspective explanatory view of a hand cart according to a second embodiment of the present invention,
FIG. 5 is an enlarged explanatory view showing traveling wheels of the hand cart according to the second embodiment of the present invention,
FIG. 6 is an enlarged explanatory view showing traveling wheels and attachment portions of the hand cart according to the second embodiment of the present invention.
A hand cart according to the second embodiment will be described with reference to FIGS.
Note that the handle device 110, the handle device mounting base 120, and the placement portion 3 are the same as the hand cart 1a according to the first embodiment. Are given the same reference numerals as the hand cart 1a according to FIG.

  The hand cart 1 b includes a handle device 110, a handle device mounting base 120, a traveling wheel 2 b, and a placement portion 3. The hand cart 1b is mainly formed of an aluminum alloy except for the tire of the traveling wheel 2b.

Each traveling wheel 2b is attached to the traveling wheel mounting base 220, and the traveling wheel mounting base 220 is provided on the back side of the lower portion of the mounting base 120 such as a handle device.
The traveling wheel mounting base 220 is formed by bending a plate-like body into a top view, and traveling wheels 2b are provided facing each side.
The traveling wheels 2b are formed to have a diameter of about 28 cm and are independently rotatable so that no axle is passed between the traveling wheels.

The traveling wheel 2b is configured by arranging the wheel components 201 and 202 in the shape of a longitudinal half of the tire symmetrically with the plane portions facing each other. (See Figs. 4 and 5)
The wheel components 201 and 202 are made of a synthetic resin material.
The wheel components 201 and 202 can be rotated around the axle, and the rotation angle is 22.5 °.

A plurality of notches 211 are provided on the outer peripheral portions of the wheel components 201 and 202.
The notches 211 are provided at equal intervals in a total of eight locations on the outer periphery of the wheel components 201 and 202, and are positioned so as to face each other across the axle.
Each notch 211 has a fan-shaped notch portion having a bottom portion of a concave portion of 90 ° in a side view over the entire width of each outer peripheral surface of each of the wheel structural bodies 201 and 202.

The outer peripheral surface sandwiched between the notches 211 constitutes a ground contact surface 212.
Each ground contact surface 212 constitutes a traveling circumferential surface of the traveling wheel 2b, and a locus formed by the traveling circumferential surface during traveling is formed in a circular shape. (See FIGS. 5 and 6)

  Although the gear wheel 213 is provided on the traveling wheel mounting base 220 side of the traveling wheel 2b, the gear wheel 213 is the same as that applied to the hand cart 1a, and thus the description thereof is omitted.

A rotation stop means 230 is provided on the wheel structure 201 located outside the traveling wheel 2b. The rotation stopping means 230 includes a locking pin 231, a ring 232, a spring 233, and an engagement groove 234.
The rotation stopping means 230 is formed so that the axial movement angle of the wheel components 201 and 202 is 22.5 °.
A ring 232 is provided at the end exposed to the outside of the locking pin 231.
The locking pin 231 is biased toward the wheel component 202 by the spring 233.
The engaging groove 234 is formed so that the locking pin 231 has a movement width of 0 ° to 22.5 °, and deep holes are provided at 0 ° and 22.5 ° positions. Are connected by a shallow hole. The deep hole is formed so as to reach the wheel structure 202. (See FIGS. 5 and 6)

  The mounting portion 3 is provided so as to be axially movable in the direction of the arrow shown in FIG.

(Work)
FIG. 7 is an explanatory diagram of a state where the hand cart according to the present invention is used on a flat road,
FIG. 8 is an explanatory diagram of a state where the hand cart according to the present invention is used on stairs.
The operation of the hand cart 1b will be described with reference to FIGS.

Please refer to FIG. First, the luggage 4 is placed on the placing table 310 related to the hand cart 1b.
When using on a flat road, the wheel configuration relating to the traveling wheel 2b is achieved by pulling the ring 232 of the rotation stopping means 230 and sliding the inner end of the locking pin 231 along the shallow hole in the engaging groove 234. The bodies 201 and 202 are rotated around the axle.
Specifically, the notches 211 and the ground contact surfaces 212 related to the wheel components 201 and 202 are alternately positioned in the width direction. (See Figure 5)
After the positioning, if the hand is released from the ring 232 of the rotation stopping means 230, the inner end of the locking pin 231 biased by the spring 233 engages with the deep hole associated with the engagement groove 234, The positions of the wheel components 201 and 202 are fixed.
After the above operation, the hand cart 1b is pulled or pushed to convey the article.

In the hand cart 1b, the notches 211 and the grounding surfaces 212 related to the wheel components 201 and 202 are alternately positioned in the width direction, and the grounding surfaces 212 are continuously or essentially continuous. .
For this reason, each ground contact surface 212 constitutes the traveling peripheral surface of the wheel, and the trajectory formed by the traveling peripheral surface during travel is circular, and the continuity of the ground contact surface 212 is maintained. It becomes difficult to get caught in small obstacles.
Moreover, the traveling wheel 2b formed with a diameter of about 28 cm is easy to get over small obstacles scattered on a flat road, and is difficult to fit into a low step or the like. Furthermore, since the traveling wheels 2b can rotate independently of each other, a small turn is effective when the direction is changed.
For this reason, the traveling property on a flat road is good, and the physical burden on the carrier can be reduced.

  If the handle device 110 is slid up and down to adjust the handle 111 to a suitable position in accordance with the size of the load 4 to be loaded, the height of the carrier, etc., the posture of the carrier becomes easier during transportation and the physical burden is reduced. Can be reduced.

  With reference to FIG. 8, the case where it climbs stairs etc. is demonstrated. In addition, since the effect | action which concerns on the rotation stop means 230 was mentioned above, description is abbreviate | omitted. Further, the steps and the like are the same as those shown in FIG.

First, before climbing the stairs or the like, the transporter releases the rotation stop means 230 and rotates the wheel components 201 and 202 related to the traveling wheel 2b around the axle.
Specifically, the notches 211 and 202 related to the wheel structural bodies 201 and 202 are matched so that the ground contact surfaces 212 are aligned in the width direction, and the notches 211 and the contact surfaces 212 are intermittently continuous on the outer periphery of the traveling wheel 2b. Then, the position of the wheel constituent members 201 and 202 is fixed by the rotation stopping means 230. (See Figs. 4 and 8)
After the above work, the transporter first climbs the stairs and the like and pulls the hand cart 1b to climb.

  In addition, when getting over the kicking part 51, any of the notch parts 211 related to the wheel constituent bodies 201 and 202 is engaged with or easily engaged with the corner part 53. (See Figure 8)

In the hand cart 1b, the notches 211 and the ground contact surfaces 212 of the wheel components 201 and 202 are aligned with each other in the width direction, and the notches 211 and the contact surfaces 212 are intermittently continuous on the outer periphery of the traveling wheel 2b. Located to be. For this reason, the notch part 211 becomes wide and engages with or easily engages with the corner part 53 when getting over the stepped-in part 51, so that the traveling wheel 2b is difficult to slide down.
Moreover, since the traveling wheel 2b formed to have a diameter of about 28 cm is formed to be equal to or larger than the height of the kick 51, it is easy to get over the stepped kick 51.
For this reason, the transporter who uses the hand cart 1b can safely climb the steps even on stairs and the like, and can reduce the physical burden.

  Due to the rotation stop means 230, the wheel components 201 and 202 are stopped at required positions, and the positions of the notches 211 and the like related to the wheel components 201 and 202 are not shifted during use. For this reason, the traveling wheel 2b does not slide or hardly slides at the corner 53, and the safety of the carrier is further improved.

Further, when climbing the stairs, the hand cart 1b can move forward, but when the traveling wheel 2b starts to reversely rotate, the locking claw 221 engages with the gear 213 and the rotation stops so that the traveling wheel stops rotating. Or, since the stop means is provided, the hand cart does not run backward under the stairs. (See Figure 6)
For this reason, when stopping in the middle of stairs etc., it is not necessary to always pull a hand cart with force and the physical burden of a carrier is reduced. In addition, it is possible to prevent the vehicle from running backward in the downward direction of the stairs and the like, so that the safety during the work of the carrier is also improved.
The hand cart 1b contributes to reducing the physical burden on the transporter and improving the safety of work by the same action as described above even on a slope.

  After use, the hand cart 1b is not bulky during storage if the handle device 110 is contracted and the placing portion 3 is folded and stored. (See the imaginary line in Figure 4)

  Since the traveling wheel 2b has a simple structure provided with a recess, the number of parts can be reduced, and the manufacturing cost can be reduced. In addition, the appearance is well organized.

  In the present embodiment, the hand cart is made of an aluminum alloy, but the hand cart is not limited to this, and other materials, for example, other metals such as stainless steel, iron, copper, titanium, synthetic resin, carbon, etc. A fiber reinforced plastic or the like or a combination thereof may be used.

  In the present embodiment, the tire is formed of a synthetic resin material, but is not limited to this, and other materials such as rubber, aluminum alloy, stainless steel, iron, copper, titanium, and other metals. , Wood, carbon fiber reinforced plastic or the like, or a combination thereof.

  In the present embodiment, the handle is nested so that it can be expanded and contracted. However, the present invention is not limited to this. For example, the handle corresponds to a plate-like body having a plurality of holes in the lower portion of the handle and an attachment base. A hole may be provided, and a screw or a pin may be inserted through each of the holes to adjust the handle position, or other known means may be used.

  In the present embodiment, the traveling wheel is provided only with the reverse rotation preventing means, but the present invention is not limited to this, and the traveling wheel can be released according to the needs of the carrier, There may be provided a safety device for stopping the forward rotation and the reverse rotation.

  In the present embodiment, the gear is provided on the tire. However, the present invention is not limited to this, and the gear may be provided on another place, for example, the rotating shaft of the traveling wheel.

In the present embodiment, a total of eight places are provided at equal intervals as the required places where the notches are provided. However, the present invention is not limited to this. For example, it may be provided at two or more and less than eight places. Although it may be provided at the above locations, it is preferable to provide at 4 or more locations since it is difficult to engage with the corners when there are few notches.
Moreover, in this Embodiment, although the rotation angle of a wheel structure is 22.5 degrees, it is not limited to this value, What is necessary is just to set suitably according to the number of notches, etc.

  In the present embodiment, the mounting portion is formed so that it can be folded and stored from the pivotally supported base portion, but is not limited to this, for example, the mounting portion is formed so that it can be telescopically retracted. It may be a publicly known technique such as

  The terms and expressions used in the present specification and claims are for illustrative purposes only, and are not intended to be limiting in any way. The features described in the present specification and claims and their terms There is no intention of excluding some equivalent terms and expressions. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

The perspective explanatory view of the hand cart concerning the 1st embodiment concerning the present invention. Explanatory explanatory drawing which shows the driving | running | working wheel part of the hand cart which concerns on 1st Embodiment which concerns on this invention. Explanatory drawing of the use condition of the hand cart which concerns on 1st Embodiment concerning this invention. The perspective explanatory view of the hand cart concerning a 2nd embodiment concerning the present invention. The expansion explanatory view showing the running wheel of the hand cart concerning a 2nd embodiment concerning the present invention. Expansive explanatory drawing which shows the driving | running | working wheel and attachment part of the hand cart which concern on 2nd Embodiment concerning this invention. Explanatory drawing of the state which used the hand cart which concerns on 2nd Embodiment which concerns on this invention on the flat road. Explanatory drawing of the state which used the hand cart which concerns on 2nd Embodiment which concerns on this invention on the stairs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Hand cart 1b Hand cart 110 Handle apparatus 111 Handle 112 Guide member 113 Horizontal frame member 114 Horizontal frame member 120 Handle apparatus etc. attachment base 121 Horizontal frame member 122 Rail member 2a Traveling wheel 2b Traveling wheel 201 Wheel structure 202 Wheel structure 211 Notch 212 Ground surface 213 Gear 220 Traveling wheel mounting base 221 Locking claw 230 Rotation stop means 231 Locking pin 232 Ring 233 Spring 234 Engagement groove 3 Mounting section 310 Mounting table 320 Bearing section 4 Luggage 51 Kicking section 52 Step Face 53 Corner

Claims (8)

A hand cart (1a) with wheels,
A required number of concave portions (211) are formed at equal intervals from the outer peripheral portion of the circular wheel (2a) toward the center, and the remaining portion is a ground contact surface (212).
The concave portion (211) is formed to receive a corner portion (53) formed by a tread surface (52) and a kick (51) of a staircase,
The remaining ground contact surface (212) constitutes the traveling circumferential surface of the wheel (2a), and the trajectory formed by the traveling circumferential surface during traveling is formed in a circular shape,
Hand cart. A hand cart (1b) with wheels (2b),
The wheel (2b) is configured to be able to change the shape of the outer periphery,
Hand cart. Wheels configured to have a recess (211) that accepts a corner (53) formed by the tread surface (52) and the kick (51) when running on stairs, and the outer periphery is circular in other cases (2b)
Hand cart. It has a required number of wheel components (201, 202) arranged in the width direction, and the shape of the outer periphery of the wheel (2b) can be changed by shifting the wheel components (201, 202),
Wheel for hand cart. A hand cart (1b) for conveying an article, comprising a handle (110), an article placement part (3), and a traveling wheel (2b),
Each traveling wheel (2b) is configured by arranging two or more wheel constituent members (201, 202) formed in a substantially disc shape in the width direction,
The outer diameter of each traveling wheel (2b) is formed to be the same as or essentially the same as or larger than the height of the kick (51) such as the stairs,
A plurality of recesses (211) formed so that corners such as stairs are fitted and engaged over the entire width or part of the width direction are provided at required positions on the outer periphery of each wheel component member (201, 202). The outer periphery between (211) constitutes the ground plane (212),
Each ground contact surface (212) constitutes the traveling circumferential surface of the wheel, and the trajectory formed by the traveling circumferential surface during traveling is formed in a circular shape,
The wheel components (201, 202) are formed so as to be able to rotate at a required angle around the axle,
When each wheel component member (201, 202) is rotated, the shape of the outer peripheral surface of the traveling wheel (2b) that appears due to the combination of each concave portion (211) formed on the outer periphery and each ground contact surface (212) changes,
One shape related to the outer peripheral surface of the traveling wheel (2) is that the recesses (211) related to the respective wheel constituent members (201, 202) coincide with each other in the width direction, and the recesses (211) are intermittently formed on the outer periphery of the traveling wheel (2b). ) And the ground contact surface (212) are continuous,
The other shape related to the outer peripheral surface of the traveling wheel (2b) is such that the recesses (211) and the ground contact surfaces (212) related to the respective wheel constituent members (201, 202) are alternately positioned in the width direction, and the ground contact surfaces (212) are continuous. Characterized by a continuous or essentially continuous shape,
Hand cart. Means (230) for stopping each rotating wheel constituent member (201, 202) at a required position is formed,
The hand cart according to claim 5. It is characterized by comprising reverse rotation prevention or stop means (212, 221) of the traveling wheels (2a, 2b) and reverse rotation release means,
The hand cart according to claim 1, 2, 3, 5 or 6. The traveling wheels (2a, 2b) are a pair of left and right,
The hand cart according to claim 1, 2, 3, 5, 6 or 7.

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