JP2017226245A - Manual type transportation instrument and caterpillar type travel unit used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To not only reduce the processing man hour of rail members, but also dispense with the assembly man hour of the rail base part of a rail member with a pair of flange parts, and further to attain the weight saving of a rail member.SOLUTION: A caterpillar type travel unit 13 that travels by means of a caterpillar chain 12 is mounted on the lower part of a load-carrying platform, and a handle member is provided on the load-carrying platform. A travel bracket 16 is mounted on the lower part of a load-carrying platform. A rail member 17 is formed by the integral plastic molding of a rail base part 17a mounted on the lower part of the travel bracket to be provided by extension in forward and rearward directions with the front end part and the rear end part curved in a vertical plane with a pair of flange parts 17a,17b extending outward from both side edges of this rail base part and formed in an ellipse form. The caterpillar chain is configured to circulate by movement along a pair of the flange parts by coupling a plurality of plastic-made couplers 21 with one another to make arrangement along the outer peripheral faces of the pair of flange parts, and to form endlessly.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a manual carrier such as a hand cart (so-called cat car), a rear car, an elderly cart (so-called silver car), and a caterpillar (endless track) traveling device used for the manual carrier. It is about.

  Conventionally, a pair of sliding members with endless belts wound around in a caterpillar shape around them are mounted in parallel on both sides of the vehicle body, and a platform is supported on the vehicle body so as to be tiltable in the front-rear direction. A formed manual transport vehicle is disclosed (for example, see Patent Document 1). In this manual transport vehicle, a roller that presses against the circumferential surface of the endless belt by the load and brakes the circulation is provided on the loading platform. The sliding member has the same structure as a glass ski known as a sport that slides down an inclined surface with a lawn. That is, the sliding member has a longitudinal annular guide ring fixed integrally around the stay connected to the mounting plate via a connecting piece having a gate shape in cross section, and a plurality of sliding pieces are belted around the guide ring. Thus, a caterpillar endless belt connected at regular intervals is wound so as to be able to go around.

  In the manual transport vehicle configured as described above, a pair of sliding members wound around a caterpillar endless belt are mounted on both sides of the vehicle body, so that it is possible to travel on stairs and keep the loading platform horizontal. Therefore, a heavy load can be easily transported to the destination without falling on the loading platform. In addition, when the stairs are raised and lowered, the load of the loading platform is applied to the peripheral surface of the endless belt via a roller, so that the circulation of the endless belt is braked. The effort can be reduced.

Japanese Patent Laid-Open No. 05-85366 (Claim 1, Claim 2, Paragraphs [0010], [0022], [0023], FIGS. 1 to 3)

  However, in the manual transport vehicle shown in the above-mentioned conventional patent document 1, after the longitudinal annular guide ring is formed by bending a metal plate, the guide ring must be fixed to the outer peripheral surface of the stay. There was a problem that man-hours and assembly man-hours increased. Further, in the conventional manual vehicle shown in Patent Document 1, the endless belt is wound without applying tension to the outer peripheral surface of the guide ring, or the endless belt is wound with tension applied to the outer peripheral surface of the guide ring. However, if a flexible belt stretches due to long-term use and looseness occurs in the endless belt, the belt can pull the sliding piece, but the belt cannot push the sliding piece. Even if it is pushed at a constant speed, the speed at which the endless belt circulates along the guide ring changes, the speed of the manual transport vehicle fluctuates, and there is a problem that the manual transport vehicle cannot run smoothly. It was. Further, in the manual transport vehicle shown in the above-mentioned conventional patent document 1, a plurality of sliding pieces are connected around the guide ring by a belt at regular intervals, so that the plurality of sliding pieces slide relative to the guide ring. However, if mud, ice, frozen snow, etc. adhere to the surface of the guide ring where multiple sliding pieces slide, the multiple sliding pieces will not slide against the guide ring, and the endless belt will follow the guide ring. There was a problem that it could not circulate smoothly.

  The first object of the present invention is to reduce the processing man-hours of the rail member, eliminate the need for the assembly man-hour between the rail base portion and the pair of flange portions of the rail member, and further reduce the weight of the rail member. An object is to provide a manual carrier and a caterpillar traveling device used therefor. The second object of the present invention is to provide a manual carrier and a caterpillar type traveling device used therefor, which can smoothly travel even on unpaved rough roads and roads, or in cold regions or cold roads where water freezes. Is to provide. The third object of the present invention is to replace only the worn cover body without replacing the coupling body which is hardly worn even after many years of use, and can reduce the repair cost of the manual carrier. An object of the present invention is to provide a transporter and a caterpillar traveling device used therefor. A fourth object of the present invention is to provide a manual carrier and a caterpillar traveling device used therefor, in which a caterpillar chain (infinite track) can be assembled by a relatively simple operation. A fifth object of the present invention is to provide a manual transporter that can smoothly travel on snow or grass, and a caterpillar travel device used therefor.

  A sixth object of the present invention is to provide a manual carrier and a caterpillar traveling device used therefor that allow forward movement and prevent reverse movement. The seventh object of the present invention is to allow the caterpillar type traveling device to follow the undulating road surface while keeping the loading platform horizontal, thereby absorbing the road surface undulations, and thereby transporting the cargo in a stable state. Another object of the present invention is to provide a manual carrier and a caterpillar traveling device used therefor. An eighth object of the present invention is to provide a manual carrier and a caterpillar traveling device used therefor that can turn left or right relatively smoothly. A ninth object of the present invention is to provide a manual carrier and a caterpillar traveling device used therefor, which can lower the center of gravity of the carrier and can stably carry the cargo placed on the carrier. is there. A tenth object of the present invention is a manual carrier that can easily overcome a relatively high step with a small force, or can easily climb a relatively high step with a small force, and is used for the same. It is to provide a caterpillar traveling device.

  As shown in FIGS. 1, 6 and 8, the first aspect of the present invention is a loading platform 11 on which a load is placed, and a caterpillar traveling device that is removably attached to the lower portion of the loading platform 11 and travels by a caterpillar chain 12. 13 and a manual carrier 10 having a handle member 14 provided on the loading platform 11 and gripped by an operator. The traveling bracket 16 has a caterpillar traveling device 13 detachably attached to the lower portion of the loading platform 11. And a rail base portion 17a attached to the lower portion of the traveling bracket 16 and extending in the front-rear direction, the front end portion and the rear end portion being curved in a vertical plane, and extending outwardly from both side edges of the rail base portion 17a and an oval shape The rail member 17 formed by integral molding of the plastic with the pair of flange portions 17b, 17b and the plurality of plastic couplers 21 are connected to each other. The above-described caterpillar chain 12 is configured to move and circulate along the pair of flanges 17b and 17b by being disposed along the outer peripheral surface of the pair of flanges 17b and 17b and forming endlessly. It is characterized by that.

  The 2nd viewpoint of the present invention is an invention based on the 1st viewpoint, Comprising: As shown in Drawing 1-Drawing 4, a plurality of connecting tools 21 are along the peripheral face of a pair of flange parts 17b and 17b. A plurality of connecting bodies 22 arranged in a pair, a pair of connecting side portions 23, 23 suspended from both sides of each connecting body 22, and a pair disposed at the respective lower ends of these connecting side portions 23, 23. Each of the flanges 17b, 17b has a pair of connecting bent portions 24, 24 that slide on the inner peripheral surface, and the connecting tool 21 has a connecting body 22, a pair of connecting side portions 23, 23, and a pair of connecting bent portions 24, 24. A plurality of rollers 26 formed by integral molding of plastic with the connecting bent portions 24 and 24 and capable of rolling on the outer peripheral surfaces of the pair of flange portions 17b and 17b rotate to the connecting device 21 via the pin shaft 27. Characterized by being able to be installed.

  The third aspect of the present invention is an invention based on the second aspect, and as shown in FIGS. 1 to 3 and 5, a plurality of cover locking holes 22 e are formed in the connecting body 22. A plurality of cover locking projections 29a project from the back surface of the plastic cover body 29 covering the surface of the connecting body 22, and the plurality of cover locking projections 29a are respectively inserted into the plurality of cover locked holes 22e. By engaging, the cover body 29 is fixed in a state of covering the surface of the connecting body 22.

  4th viewpoint of this invention is invention based on 2nd viewpoint, Comprising: Furthermore, as shown in FIGS. 2-4 and FIG. 6, a pair of connection side parts 23 and 23 are provided with a pair on the outer surface on one end side. Connecting locking projections 23c and 23c are respectively provided, and a pair of connecting locked holes 28a and 28a are formed on both side portions on the other end side of the connecting main body 22. The protrusions 23c and 23c are locked in the pair of locking engagement holes 28a and 28a of the connecting tool 21 adjacent to the connecting tool 21, and the pair of connecting locking protrusions 23c and 23c of the connecting tool 21 adjacent to the connecting tool 21 are connected. The caterpillar chain 12 is configured by repeating the locking structure in which the adjacent connecting tool 21 is further locked to the pair of connected locking holes 28a, 28a of the connecting tool 21 adjacent thereto.

  A fifth aspect of the present invention is an invention based on any of the first to third aspects, and further includes a sled member 61 that can slide on snow or grass as shown in FIGS. The sled member 61 has a front part or a front part and a rear part that are curved upward, a flat center part, and a sliding part 61a that can slide on snow or grass, and a center part of the sliding part 61a. And a caterpillar chain loose insertion hole 61b that can be loosely inserted into the caterpillar chain 12 attached to the rail member 67, and a plurality of sled attachment parts 61c that project from the periphery of the caterpillar chain loose insertion hole 61b of the sliding part 61a. A plurality of bosses 67c are provided on both side surfaces of the rail base portion 67a so as to be integrated with the rail base portion 67a, respectively, and a plurality of sled attachment members 68 are provided at the tips of the plurality of bosses 67c. With the plurality of sled attachment portions 61c attached to the plurality of sled attachment members 68, the bottom surface of the sliding portion 61a is located between the lower running portion of the caterpillar chain 12 and the sled attachment member 68. It is comprised so that it may be located in.

  The sixth aspect of the present invention is an invention based on the first aspect, and further, as shown in FIG. 14, a stopper 81 whose base end is attached to the traveling bracket 86 and whose distal end contacts the caterpillar chain 12 is provided. The stopper 81 is configured to allow movement of the caterpillar chain 12 to one side and prevent movement of the caterpillar chain 12 to the other side.

  A seventh aspect of the present invention is an invention based on the first aspect, and further, as shown in FIGS. 1 and 6 to 8, a notch 31 b or a loading platform side through hole is formed in the lower portion of the loading platform 11. The mounting upper bracket 31 is provided, and the traveling bracket 16 is provided with a traveling side through hole 32c whose upper surface is opposed to the mounting upper bracket 31 and communicates with the notch 31b or the loading platform side through hole. The lower bracket 32 is provided, and the lower bracket 32 for mounting is engaged with the upper bracket 31 for mounting so that the cutout portion 31b or the loading side side through hole 32c is aligned with the cutout portion 31b or the traveling side through hole 32c. The loading platform 11 is attached to the caterpillar type traveling device 13 by inserting a horizontal pin 36 through the loading platform side through hole and the traveling side through hole 32c.

  The eighth aspect of the present invention is an invention based on the seventh aspect, and as shown in FIG. 17, a horizontal turning mechanism 207 is provided between the traveling bracket 161 and the mounting lower bracket 202, The horizontal turning mechanism 207 is attached to the upper surface of the traveling bracket 161 and is provided with a supporting protrusion 208a or a supporting protrusion that slidably receives the lower surface of the lower mounting bracket 202, and a turning support plate 208. And a vertical shaft 209 that is inserted into the lower mounting bracket 202 and rotatably holds the lower mounting bracket 202.

  The ninth aspect of the present invention is the invention based on the first aspect, and as shown in FIG. 20, the upper portions of the pair of flange portions 237b, 237b are curved in a direction approaching the lower portion. It is characterized by that.

  The tenth aspect of the present invention is an invention based on the first aspect, and as shown in FIG. 21, the lower curvature of the curved portion of the front end portion and the rear end portion of the pair of flange portions 257b, 257b. The radius is larger than the upper curvature radius.

  An eleventh aspect of the present invention is a caterpillar traveling device 13 used for the manual carrier 10 according to any one of the first to tenth aspects as shown in FIGS. 1 and 8.

  In the manual carrier of the first aspect of the present invention, since the rail member is formed by integrally molding the rail base and the pair of flanges, the guide ring is formed after the guide ring is formed by bending a metal plate. Compared with the conventional manual transport vehicle that increases the processing man-hours and assembly man-hours by adhering to the outer peripheral surface of the stay, the processing man-hours of the rail member can be reduced, and the rail base part of the rail member and the pair of flange parts The number of assembling steps can be eliminated, and the weight of the rail member can be further reduced. Further, since the caterpillar chain is configured by connecting a plurality of plastic couplers, each coupler constituting the caterpillar chain can push or pull the adjacent coupler. As a result, when the manual transporter is pushed at a constant speed, the speed at which the caterpillar chain circulates along the pair of collars hardly changes, so that the manual transporter can be smoothly run at a constant speed. .

  In the manual transporter according to the second aspect of the present invention, the connector is formed by integral molding of the connecting body, the pair of connecting side portions, and the pair of connecting bent portions, and the outer periphery of the pair of flange portions. Since the plurality of rollers that can roll on the surface are rotatably attached to the connector via the pin shaft, the caterpillar chain that is configured by connecting the plurality of connectors and has relatively high rigidity hardly expands or contracts. For this reason, even if mud, ice, frozen snow or the like adheres to the pair of flange outer peripheral surfaces, the rollers attached to the plurality of coupling tools roll on the pair of flange outer peripheral surfaces, Mud, ice, frozen snow, etc., which adheres to the outer peripheral surface of the heel part, breaks and peels off from the pair of heel part surfaces, and is removed from the pair of heel part. As a result, the manual transporter can smoothly travel on rough roads and roads that are not paved, or in cold regions or cold season roads where water freezes.

  In the manual carrier according to the third aspect of the present invention, the cover body engages the cover locking projection of the plastic cover body with the cover locking hole of the connection main body, so that the cover body covers the surface of the connection main body. Since the cover body is fixed to the surface of the connection main body in the covered state, the connection main body is not grounded and only the cover body is grounded when the manual carrier is traveling. For this reason, even if the cover body is worn due to the long-term use of the manual carrier, the connecting body does not wear. As a result, it is only necessary to replace the worn cover body without replacing the connecting body that does not wear, so that the repair cost of the manual carrier can be reduced.

  In the manual transporter according to the fourth aspect of the present invention, the pair of connecting locking projections of the connecting tool are locked in the pair of connecting locked holes of the connecting tool adjacent to the connecting tool, and are adjacent to each other. Since the caterpillar chain is configured by repeating the locking structure in which the pair of connecting locking projections of the connecting tool are further locked to the pair of connected locking holes of the connecting tool adjacent to the adjacent connecting tool. The chain can be assembled by a relatively simple operation.

  In the manual carrier of the fifth aspect of the present invention, when the sled mounting portion of the sled member is mounted on the sled mounted member at the boss tip of the rail base, the sled member surrounds the front, rear and both sides of the caterpillar chain. In this state, since the bottom surface of the sliding part is located between the lower traveling part of the caterpillar chain and the sled mounting member, the lower part of the caterpillar type traveling device is buried in snow or lawn that is not pressed, but the sled member Is kept on the snow surface or lawn surface. As a result, the manual carrier can smoothly slide on the snow or on the lawn. Further, when the manual transporter travels on a snow surface that is in pressure contact, or travels on a hard road surface such as soil or asphalt, the sled member is kept floating from the road surface. As a result, the manual transporter can smoothly travel on the snow surface that is press-contacted or a hard road surface such as soil or asphalt by the caterpillar chain.

  In the manual carrier of the sixth aspect of the present invention, although the stopper allows movement of the caterpillar chain to one side and prevents movement of the caterpillar chain to the other, the manual carrier can advance. Can't go backwards. As a result, it is possible to prevent unintended reverse travel of the manual transporter.

  In the manual transporter according to the seventh aspect of the present invention, the caterpillar traveling device swings back and forth with respect to the cargo bed around the horizontal pin, so that the caterpillar traveling device is undulated while keeping the cargo bed horizontal. By running following the road surface, the undulations on the road surface can be absorbed. As a result, the luggage loaded on the loading platform can be transported in a stable state without falling over or falling from the loading platform.

  In the manual transporter according to the eighth aspect of the present invention, the horizontal turning mechanism is provided between the lower bracket for mounting the traveling bracket, so that the handle member is set to the left or right with respect to the traveling direction of the caterpillar traveling device. The direction of the cargo bed can be changed by rotating it. As a result, the manual carrier can be turned left or right relatively smoothly.

  In the manual carrier according to the ninth aspect of the present invention, since the upper part of the pair of hooks is formed to bend in the direction approaching the lower part, the center of gravity of the cargo bed can be lowered. As a result, the load placed on the loading platform can be transported in a stable state.

  In the manual carrier according to the tenth aspect of the present invention, the lower curvature radius of the curved portion of the front end portion and the rear end portion of the pair of flanges is formed to be larger than the upper curvature radius. When the front part of the caterpillar chain is brought into contact, the upper part of the front end of the caterpillar chain covers the upper edge of the relatively high step. As a result, if the manual carrier is moved forward as it is, even if it is a relatively high step, it can be easily overcome with a small force, or easily with a small force on a relatively high step. You can get on.

  Since the caterpillar traveling device of the eleventh aspect of the present invention is the caterpillar traveling device used for the manual carrier according to any of the first to tenth aspects, the first to tenth aspects described above. The effect similar to the manual carrier described in any of the above can be obtained.

It is the sectional view on the AA line of FIG. 6 which shows the caterpillar type traveling apparatus used for the handcart (manual-type carrier) of 1st Embodiment of this invention. It is a perspective view which shows the state just before attaching a roller and a cover body to two connection main bodies of the caterpillar type traveling apparatus, respectively, and just before connecting two connection main bodies. It is a side view which shows the state which attached the roller and the cover body to two connection main bodies of the caterpillar type traveling device, respectively, and connected two connection main bodies. (A) is the BB sectional drawing of FIG.5 (b), (b) is CC sectional view taken on the line of FIG.5 (c). (A) is the longitudinal cross-sectional view which shows the state just before attaching a roller and a cover body to two connection main bodies, respectively, and just before connecting two connection main bodies, (b) is D of FIG. 4 (a). It is -D sectional drawing, (c) is the EE sectional view taken on the line of FIG.4 (b). It is the FF sectional view taken on the line of FIG. It is a side view of the caterpillar type traveling device. It is a side view which shows the state after exchanging the state before exchanging the wheel of the hand truck (manual type carrier) to a caterpillar type traveling device, respectively. It is a side view which shows the state which the handcart (manual-type carrier) which replaced the wheel with the caterpillar type traveling apparatus is driving | running | working the road with ups and downs, keeping a loading platform horizontal. It is a perspective view of the sled member attached to the caterpillar type traveling device of a 2nd embodiment of the present invention. It is the GG sectional view taken on the line of FIG. It is a side view which shows the state just before attaching the sled member to a caterpillar type traveling device. It is a side view which shows the state which attached the sled member to the caterpillar type traveling device. It is a principal part longitudinal cross-sectional view of the caterpillar type traveling apparatus for demonstrating the function of the stopper which controls the running direction of the caterpillar chain of 3rd Embodiment of this invention. It is a side view which shows the state before and after replacing | exchanging the wheel of the rear car (manual-type carrier) of 4th Embodiment of this invention to a caterpillar type traveling apparatus, respectively. While the three wheels (front one axle, rear one axle, a single front wheel and a pair of rear wheels) of the fifth embodiment of the present invention are replaced with three caterpillar traveling devices, the manual transporter suppresses the inclination of the loading platform. It is a side view which shows the state which is drive | working the road with a undulation. It is a longitudinal cross-sectional view corresponding to FIG. 6 which shows the caterpillar type traveling apparatus provided with the horizontal turning mechanism of 6th Embodiment of this invention. Of the five wheels (one front axle, two rear axles, a single front wheel and two pairs of rear wheels), the front wheels are replaced with a single caterpillar traveling device having a horizontal turning mechanism, and the two pairs of rear wheels turn horizontally. It is a side view of the manual transporter which shows the state exchanged to a pair of caterpillar type traveling apparatus which does not have a mechanism. It is a top view of the manual carrier. It is a side view corresponding to FIG. 7 which shows 7th Embodiment of this invention. It is a side view corresponding to FIG. 7 which shows 8th Embodiment of this invention.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
As shown in FIGS. 8 and 9, the manual carrier 10 is a hand cart called a cat carriage in this embodiment. The hand cart 10 includes a loading platform 11 on which loads are loaded, a caterpillar type (endless track type) traveling device 13 that is removably attached to the lower portion of the loading platform 11 and travels by a caterpillar chain (infinite track) 12, and a loading platform 11. And a handle member 14 provided. The loading platform 11 is formed in a large bowl shape having an opening on the upper surface, and is configured to be able to load various packages such as packaged parcels for delivery, sand, earth, and gravel. In addition, two handle members 14 are provided in a protruding manner from the both sides of the upper rear surface of the loading platform 11 one by one in the rear direction. 14a is provided.

  On the other hand, the caterpillar type traveling device 13 is a rail member formed by integrally molding a traveling bracket 16 that is detachably attached to the lower part of the loading platform 11, a rail base portion 17a to be described later, and a pair of flange portions 17b and 17b. 17 and the above-described caterpillar chain 12 formed endlessly by connecting a plurality of plastic couplers 21 to each other (FIGS. 1, 6 and 7). The traveling bracket 16 is suspended from the traveling horizontal piece 16a located above the upper traveling portion of the caterpillar chain 12 and at the center in the longitudinal direction of the upper traveling portion, and both side edges of the traveling horizontal piece 16a. A pair of traveling side pieces 16b, 16b, a pair of traveling approach pieces 16c, 16c bent in a direction approaching each other from the lower ends of the pair of traveling side pieces 16b, 16b, and these traveling approach pieces 16c, It consists of a pair of traveling attachment pieces 16d, 16d suspended from the inner end of 16c. Two traveling through holes 16e are formed in the pair of traveling attachment pieces 16d, 16d so as to be spaced apart from each other in the horizontal direction and opposed to each other (FIGS. 1 and 6). The traveling bracket 16 is formed in a gate shape so as to straddle the upper traveling portion of the caterpillar chain 12. Further, the traveling horizontal piece 16a, the pair of traveling side pieces 16b, 16b, the pair of traveling approaching pieces 16c, 16c and the one traveling attachment piece 16d, 16d are formed by pressing a metal plate such as stainless steel. It is preferably formed by.

  On the other hand, the rail base portion 17a is attached to the lower portion of the traveling bracket 16, that is, to the pair of traveling attachment pieces 16d and 16d (FIGS. 1, 6 and 7). Further, the rail base portion 17a is provided to extend in the front-rear direction, and the front end portion and the rear end portion of the rail base portion 17a are curved so as to have a predetermined radius of curvature R (FIG. 7) in the vertical plane. That is, the rail base portion 17a is formed in an oval shape extending in the front-rear direction when viewed from the side surface (FIGS. 6 and 7). Further, the pair of flange portions 17b and 17b are formed in an oval shape extending outward from both side edges of the rail base portion 17a and extending in the front-rear direction along both side edges of the rail base portion 17a. The rail base portion 17a and the pair of flange portions 17b, 17b are preferably integrally formed by plastic injection molding, and examples of the plastic include polypropylene with long glass fibers. Thus, since the rail base portion 17a and the pair of flange portions 17b, 17b of the rail member 17 are formed by integral molding of plastic, the guide ring is formed by bending a metal plate in a conventional manual transport vehicle. In this embodiment, the processing man-hour of the rail member 17 can be reduced and the rail base portion 17a of the rail member 17 and the pair of flanges can be reduced. The number of assembling steps with 17b and 17b can be eliminated, and the weight of the rail member 17 can be further reduced.

  In addition, in order to prevent sink marks (dents and depressions) from being generated in the rail base portion 17a during injection molding and to reduce the weight of the rail base portion 17a, a plurality of concave portions 17c whose lower surfaces are open are provided in the longitudinal direction of the rail base portion 17b. (FIG. 1). Further, reference numeral 17d in FIG. 1 is an insertion hole formed at the center in the front-rear direction of the rail base portion 17a. Two insertion holes 17d are formed at intervals in the horizontal direction. These insertion holes 17d correspond to the traveling through holes 16e and 16e formed in the pair of traveling mounting pieces 16d and 16d of the traveling bracket 16 respectively, and are respectively connected to the insertion hole 17d and the traveling through hole 16e. The rail member 17 is fixed to the lower portion of the traveling bracket 16 by inserting the bolt 18 and screwing the nut 19 into the tip of the bolt 18. Further, an upper concave portion (not shown) is formed above the insertion hole 17d and the upper surface opens to the center upper portion of the rail base portion 17a. The lower surface opens below the insertion hole 17d to reach the lower center portion of the rail base portion 17a. An extended lower recess (not shown) is formed. By forming the upper concave portion and the lower concave portion, the thickness of the insertion hole boss 17e around the insertion hole 17d is made constant, and it is possible to prevent the occurrence of sink marks (dents and depressions) on the inner surface of the insertion hole 17d. It has become.

  The plurality of couplers 21 include a plurality of coupling main bodies 22 arranged along the outer peripheral surfaces of the pair of flanges 17b, 17b, and a pair of coupling side sections 23, 23 suspended from both sides of each coupling main body 22. And a pair of connecting bent portions 24, 24 that are arranged at the lower ends of the connecting side portions 23, 23 and slide on the inner peripheral surfaces of the pair of flange portions 17b, 17b, respectively (FIG. 2). To FIG. 5). The connecting body 22 has a predetermined curvature radius so as to surround the flat plate portion 22a formed in a substantially square plate shape and the pair of connecting bent portions 24, 24 connected to one end of the flat plate portion 22a. And a curved plate portion 22b formed in a plate shape which is curved at (FIGS. 3 and 5). The width of the connecting body 22 is formed wider than the width of the pair of flanges 17b, 17b, that is, the distance between the outer edge of one flange 17b and the outer edge of the other flange 17b (FIG. 1). Further, the pair of connecting side portions 23 and 23 are each formed in a substantially triangular shape that is separated from the connecting main body 22 so that the width thereof is narrowed. The portions of the pair of connecting side portions 23 and 23 farthest from the connecting main body 22 That is, the lower ends of the pair of connecting side portions 23, 23 are formed so as to be positioned slightly below one end side (curved plate portion 22b side) from the center of the flat plate portion 22a of the connecting body 22 (FIGS. 2 and 3). And FIG. 5). Further, the pair of connecting bent portions 24 and 24 are formed in a substantially cylindrical shape, and project from the lower end side surfaces of the pair of connecting side portions 23 and 23 toward each other (FIG. 1). The connector 21 is formed by integral molding of a connecting body 22, a pair of connecting side portions 23, 23, and a pair of connecting bent portions 24, 24.

On the other hand, a plurality of rollers 26 capable of rolling on the outer peripheral surfaces of the pair of flanges 17b, 17b are rotatably attached to the connector 21 via the pin shaft 27 (FIGS. 1, 4, and 5). That is, the two rollers 26 and 26 are rotatably inserted into the single pin shaft 27, and the pin shaft 27 is attached to the single connector 21. Specifically, a pair of pin shaft grooves 23a and 23a into which the pin shaft 27 can be inserted are formed in the pair of connection side portions 23 and 23 of the connector 21, respectively. An elastically deformable pin shaft protrusion 23b is provided in the vicinity of the heel end (FIGS. 3 and 5A). The pin shaft groove 23 a has a base end positioned between the distal end edge of the curved plate portion 22 b of the connection main body 22 and the connection bent portion 24, and a flange end positioned at the center of the connection side portion 23. It forms in the side part 23 for a connection so. Further, the pin shaft protrusion 23b is easily formed by the pin shaft 27 inserted into the pin shaft groove 23a over the pin shaft protrusion 23b and reaching the end of the pin shaft groove 23a. It is formed to prevent it from coming off. Further, the axis of the pin shaft 27 inserted into the flange end of the pin shaft concave groove 23 a is configured to substantially coincide with the center of the radius of curvature of the curved plate portion 22 b of the connecting body 22. 1 and 4, reference numeral 22d indicates that the pin shaft 27 receives the center in the longitudinal direction of the pin shaft 27 when both ends of the pin shaft 27 are inserted into the flange ends of the pair of pin shaft concave grooves 23a. 27 is a pin bearing recess for preventing the deformation of 27. The pin bearing recess 22 d is formed in a reinforcing rib 22 c that protrudes in parallel with the pair of connecting side portions 23, 23 at the center of the back surface of the connecting body 22. By this reinforcing rib 22c, the back surface on one end side of the connector 21 is partitioned into a pair of roller accommodating recesses 21a and 21a that can accommodate two rollers 26 and 26, respectively (FIG. 4). Further, as shown in FIG. 3, in the vertical plane extending in the longitudinal direction of the caterpillar chain 12, a vertical line suspended from the pin shaft 27 inserted to the end of the pin shaft concave groove 23a is defined as L ₁ , when a straight line connecting the axial center of the connecting bent portion 24 with the axis of the shaft 27 and L _2, it is preferable that the angle θ between the vertical line L ₁ and the straight line L ₂ is about 30 degrees. This is because when the connecting bent portion 24 of the connector 21 passes through the curved portions of the pair of flange portions 17b and 17b, the connecting bent portion 24 is placed on the back surface of the pair of flange portions 17b and 17b. This is to prevent the connecting tool 21 from being lifted from the pair of flange portions 17b and 17b while preventing the pressure contact and wearing.

  A pair of coupling locking projections 23c and 23c project from the outer surfaces of one end of the pair of coupling side portions 23 and 23, respectively, and a pair of coupling locked portions on both sides of the other end side of the coupling body 22. Holes 28a and 28a are formed (FIGS. 2 to 4). The connecting locking projection 23c is formed in a low columnar shape, and the axial center of the connecting locking projection 23c coincides with the axial center of the pin shaft 27 inserted in the flange end of the pin shaft concave groove 23a. Formed as follows. Further, the diameter of the coupling locking projection 23c is formed smaller than the diameter of the roller 26, and a part of the pin shaft concave groove 23a including the flange end of the pin shaft concave groove 23a is closed by the coupling locking projection 23c. Configured to be The pair of coupled locking holes 28a, 28a is a pair of projections provided on both side portions on the other end side of the coupling body 22 so as to be away from the coupling body 22 and obliquely downward and parallel to each other. They are formed on the connecting protrusions 28, 28, respectively. Further, the interval between the inner surfaces of the pair of connecting projections 28, 28 facing each other is configured to be substantially the same as the interval between the outer surfaces of the pair of connecting side portions 23, 23. The connection locking projections 23c and the connection protrusions 28 are formed by integrally molding the plastic with the connector 21, and the height of the connection lock protrusions 23c is substantially the same as the thickness of the connection protrusions 28. Is done. The connecting locking projection 23c is formed to have a small diameter column portion 23d protruding from the outer surface of the connecting side portion 23 and a slightly larger diameter than the small diameter column portion 23d provided at the tip of the small diameter column portion 23d. And a large-diameter column portion 23e (FIG. 4). Furthermore, the coupling-engaged hole 28a is formed on the inner surface side of the coupling projection piece 28 so as to be slightly larger in diameter than the small-diameter column portion 23d and slightly smaller in diameter than the large-diameter column portion 23e. And a large-diameter hole portion 28c formed on the outer surface side of the connecting projection piece 28 slightly larger in diameter than the large-diameter column portion 23e. Then, the pair of coupling locking projections 23c, 23c of the coupling tool 21 are respectively locked to the pair of coupling locking holes 28a, 28a of the coupling tool 21 adjacent to the coupling tool 21, and the adjacent coupling tool. The caterpillar is repeated by repeating the locking structure in which the pair of connecting locking projections 23c, 23c of the 21 is locked to the pair of connected locking holes 28a, 28a of the connecting tool 21 further adjacent to the adjacent connecting tool 21. A chain 12 is constructed. The large-diameter column portion 23e of the coupling locking projection 23c is accommodated in the large-diameter hole portion 28c of the coupling-engaged hole 28a, and the small-diameter column portion 23d of the coupling locking projection 23c is the coupling-engaged hole. By being accommodated in the small-diameter hole portion 28b of 28a, the connecting locking projection 23c is difficult to be removed from the connecting locked hole 28a, and the caterpillar chain 12 is kept in an endless state. Thus, the caterpillar chain 12 connects a plurality of plastic couplers 21 to each other, arranges them along the outer peripheral surfaces of the pair of flange portions 17b, 17b, and forms endlessly, thereby forming a pair of flange portions 17b. , 17b and configured to move around (FIGS. 1, 6 and 7).

  On the other hand, a plurality of cover locking holes 22e are formed in the connection main body 22, and a plurality of cover lock protrusions 29a project from the back surface of the plastic cover body 29 covering the surface of the connection main body 22. (FIGS. 1, 3 and 5). The cover body 29 is formed in a substantially square plate shape so as to cover the flat plate portion 22a of the connection main body 22 (FIG. 2). In this embodiment, four cover-engaged holes 22e are formed in the flat plate portion 22a of the connecting body 22 (FIG. 2), and four cover-engagement protrusions 29a are formed on the back surface of the cover body 29. (FIGS. 1, 3 and 5). The cover locking projection 29a includes a neck portion 29b protruding from the back surface of the cover body 29, and a head portion 29c provided at the tip of the neck portion 29b and having a slightly larger diameter than the neck portion 29b (see FIG. 5 (a)). The cover locking hole 22e is formed on the surface side of the flat plate portion 22a of the connecting body 22 so as to be slightly smaller in diameter than the head 29c of the cover locking projection 29a, and the neck portion 29b of the cover locking projection 29a. A neck receiving hole 22f formed with a slightly larger diameter, and a head receiving hole formed slightly larger in diameter than the head 29c of the cover locking projection 29a on the back side of the flat plate portion 22a of the connecting body 22 22g. Furthermore, the cover body 29 is fixed in a state of covering the surface of the connecting body 22 by engaging the four cover locking protrusions 29a with the four cover locked holes 22e, respectively. The head 29c of the cover locking projection 29a is received in the head receiving hole 22g of the cover locked hole 22e, and the neck 29b of the cover locking projection 29a is stored in the neck of the cover locked hole 22e. By being accommodated in the hole 22f, the cover locking projection 29a is difficult to be removed from the cover locked hole 22e, and the cover body 29 cannot be easily detached from the coupling body 22. The connecting tool 21, the roller 26, and the cover body 29 of the caterpillar chain 12 are preferably formed of weatherproof plastic such as 66 nylon, and the pin shaft 27 is formed of a metal round bar such as stainless steel. It is preferable.

  On the other hand, a gate-shaped upper bracket 31 for mounting is attached to the lower part of the loading platform 11, specifically to the center of the lower surface of the loading platform 11 (FIGS. 1 and 6 to 8). The mounting upper bracket 31 includes an upper mounting piece (not shown) attached to the lower surface of the loading platform 11, and a pair of upper vertical pieces 31a and 31a suspended from both sides of the upper mounting piece. A pair of inverted U-shaped notches 31b and 31b (FIGS. 1, 6 and 7) are formed below the upper vertical pieces 31a and 31a, respectively. Further, an attachment lower bracket 32 facing the attachment upper bracket 31 is attached to the upper surface of the traveling bracket 16. The mounting lower bracket 32 includes a lower mounting piece 32a attached to the upper surface of the traveling bracket 16 by a bolt 33 and a nut 34, and a pair of lower vertical pieces projecting vertically upward from both sides of the lower mounting piece 32a. 32b, 32b. A pair of travel side through holes 32c and 32c (FIG. 1) are formed on the upper portions of the lower vertical pieces 32b and 32b, respectively. Then, the mounting lower bracket 32 is engaged with the mounting upper bracket 31 so that the notch 31b and the traveling side through hole 32c are aligned with each other, and the horizontal pin 36 is connected to the notched portion 31b and the traveling side through hole 32c. Is inserted into the caterpillar traveling device 13. Specifically, male screws 36a and 36a are formed at both ends of the horizontal pin 36, respectively. After the horizontal pin 36 is inserted into the pair of travel side through holes 32c and 32c, the male screws 36a and 36a at both ends of the horizontal pin 36 are received. The nut 37 and the presser nut 38 are screwed together, and the lower part of the pair of upper vertical pieces 31a and 31a of the upper bracket 31 for mounting is clamped by the receiving nut 37 and the presser nut 38, so that the mounting upper bracket 31 is attached. The lower bracket 32 is pivotally attached. As a result, the caterpillar type traveling device 13 swings in the front-rear direction with respect to the loading platform 11 around the horizontal pin 36, and is configured to be able to travel on a undulating road 39 while keeping the loading platform 11 horizontal.

  In addition, a reinforcing tool 41 for keeping the distance between the pair of lower vertical pieces 32b, 32b constant is attached to the lower bracket 32 for attachment (FIGS. 1, 6, and 7). The reinforcing member 41 includes a screw rod 41a formed longer than the outer width between the pair of lower vertical pieces 32b, 32b of the mounting lower bracket 32 and having an external thread formed on the outer peripheral surface, and a pair of lowers of the mounting lower bracket 32. The pipe 41b is formed to have the same length as the inner width between the vertical pieces 32b and 32b, and the screw rod 41a can be freely inserted therein, and a pair of nuts 41c and 41c that can be screwed to both ends of the screw rod 41a. The screw rod 41a is inserted into the reinforcing holes 32d and 32d formed in the pair of lower vertical pieces 32b and 32b of the mounting lower bracket 32 (FIG. 1).

  An assembly procedure of the caterpillar traveling device 13 configured as described above will be described. The two rollers 26 and 26 are inserted into the pin shaft 27 in advance (FIGS. 2 and 5A), and both ends of the pin shaft 27 are fitted to the pair of pin shaft concave grooves 23a and 23a. Each end is inserted (FIGS. 4A and 5B). Further, the four cover locking projections 29a of the cover body 29 are driven into and engaged with the four cover locking holes 22e of the connection main body 22 with a small spear 42 (FIG. 5 (a)). A cover body 29 is attached to the main body 22 (FIG. 5B). The above operation is repeated to assemble a plurality of connector assemblies 43 (FIGS. 4A and 5B). Then, the pair of connection locking projections 23c, 23c of the connection tool assembly 43 are locked to the pair of connection locked holes 28a, 28a of the connection tool assembly 43 adjacent to the connection tool assembly 43, The pair of connecting locking projections 23c, 23c of the adjacent connecting tool assembly 43 are inserted into the pair of connecting locked holes 28a, 28a of the connecting tool assembly 43 further adjacent to the adjacent connecting tool assembly 43. The caterpillar chain 12 having a straight predetermined length is produced by repeating a relatively simple operation of locking (FIGS. 3, 4 (b) and 5 (c)). At this time, the pair of connecting protrusions 28, 28 of the connector assembly 43 are elastically deformed and spread, and the adjacent connecting holes 28a, 28a of the connecting protrusions 28, 28 are connected adjacently. With the pair of connecting locking projections 23c, 23c of the tool body 22 facing each other, the pair of connecting locking projections 23c, 23c are inserted into a pair of connecting locked holes 28a, 28a (not shown). ) And is preferably locked. Further, the pipe 41b is inserted between the pair of vertical pieces 32b, 32b of the mounting lower bracket 32 so that both ends of the pipe 41b of the reinforcing tool 41 are desired in the pair of reinforcing holes 32d, 32d, respectively, and the screw rod 41a is reinforced. After passing through the use hole 32d and the pipe 41b, a pair of nuts 41c and 41c are screwed into both ends of the screw rod 41a. As a result, the pair of vertical pieces 32b, 32b of the mounting lower bracket 32 can be prevented from separating from each other or approaching each other.

  First, the upper surface of the traveling horizontal piece 16 a of the traveling bracket 16 is attached to the lower surface of the lower attaching piece 32 a of the attaching lower bracket 32 by the bolt 33 and the nut 34. Next, the pair of travel attachment pieces 16d, 16d of the travel bracket 16 are elastically deformed and spread, straddling the upper portions of the pair of flange portions 17b, 17b of the rail member 17, and in this state, the pair of travel attachment pieces The rail member 17 is attached to the lower mounting bracket 32 by inserting a bolt 18 through the through hole 16e for traveling 16d, 16d and the insertion hole 17d of the rail base portion 17a, and screwing a nut 19 to the tip. Next, the straight caterpillar chain 12 is attached to the pair of flange portions 17 b and 17 b of the rail member 17. At this time, in order from one end side of the linear caterpillar chain 12, the pair of connecting side portions 23, 23 of the connecting tool 21 are elastically deformed and spread, and the connecting tool 21 straddles the pair of flange parts 17b, 17b. The connector 21 is attached to the rail member 17. When attaching the connecting tool 21 located at the other end of the straight caterpillar chain 12 to the rail member 17, the connecting tool 21 is attached to the rail member 17 and simultaneously connected to one end of the straight caterpillar chain 12. By connecting to the tool 21, the caterpillar chain 12 is made endless. Thereby, the assembly of the caterpillar traveling device 13 is completed. In addition, if two types of connecting devices 21 having a distance of 1 mm between the axial center of the connecting locking projection 23c of the connecting side portion 23 and the center of the connecting locked hole 28a of the connecting projection piece 28 are prepared, the caterpillar is prepared. Even if a processing error or an assembly error occurs in each member constituting the traveling device 13, the total length of the caterpillar chain 12 can be finely adjusted by combining the two types of connecting members 21, so that the flange portion 17b of the rail member 17 Can be adjusted to the full length of

  A procedure for exchanging the caterpillar traveling device 13 assembled in this way with the wheel 44 of the hand cart (manual carrier) 10 will be described with reference to FIG. First, the wheel 44 (FIG. 8A) of the hand cart 10 is removed from the loading platform 11. Next, the horizontal pin 36 is inserted into the pair of traveling side through holes 32c, 32c of the mounting lower bracket 32 of the caterpillar traveling device 13, and the receiving nuts 37, 37 are respectively inserted into the male screws 36a, 36a at both ends of the horizontal pin 36. Screw together. Next, the pair of notches 31b and 31b provided on the pair of upper vertical pieces 31a and 31a of the mounting upper bracket 31 attached to the lower surface of the loading platform 11 are fitted into both ends of the horizontal pin 36, respectively. Further, a presser nut 38 is screwed into the male threads 36a, 36a at both ends of the horizontal pin 36, the lower part of the left upper vertical piece 31a is received by the nut 37 and the presser nut 38, and the lower part of the right upper vertical piece 31a. It is clamped by the receiving nut 37 and the presser nut 38. Thereby, the replacement of the wheels 44 with the caterpillar type traveling device 13 is completed (FIG. 8B).

  Thus, in the handcart 10 whose wheels have been replaced with the caterpillar traveling device 13, in a state in which the load is placed on the loading platform 11, the gripping portion 14 a of the handle member 14 is gripped and the handcart 10 is pushed to raise and lower the road. When the vehicle travels 39, the caterpillar traveling device 13 swings back and forth with respect to the loading platform 11 around the horizontal pin 36, so that the caterpillar traveling device 13 keeps the loading platform 11 horizontal and the road surface of the undulating road 39. The undulations on the road surface 39a can be absorbed by running following the road 39a (FIG. 9). As a result, the load loaded on the loading platform 11 can be transported in a stable state without falling on the loading platform 11 or falling from the loading platform 11. Further, since the caterpillar chain 12 is configured by connecting a plurality of plastic couplers 21, each coupler 21 constituting the caterpillar chain 12 can push or pull the adjacent coupler 21. As a result, when the hand cart 10 is pushed at a constant speed, the speed at which the caterpillar chain 12 circulates along the pair of flanges 17b and 17b hardly changes, so that the hand cart 10 smoothly travels at a constant speed. Can be made.

  Further, the connecting tool 21 is formed by integrally molding plastics of the connecting body 22, the pair of connecting side portions 23, 23, and the pair of connecting bent portions 24, 24, and the outer peripheral surfaces of the pair of flange portions 17b, 17b. Since the plurality of rollers 26 that can roll up are rotatably attached to the connector 21 via the pin shaft 27, the caterpillar chain 12 that is configured by connecting the plurality of connectors 21 and has a relatively high rigidity almost extends. Does not shrink. For this reason, even if mud, ice, frozen snow, or the like adheres to the outer peripheral surfaces of the pair of flanges 17b, 17b, the rollers 26 attached to the plurality of coupling members 21 remain on the outer peripheral surfaces of the pair of flanges 17b, 17b. , The mud, ice, frozen snow, and the like that adhere to the outer peripheral surfaces of the pair of flanges 17b, 17b break and peel from the surfaces of the pair of flanges 17b, 17b, and the pair of flanges 17b, Excluded from 17b. As a result, the hand cart 10 can smoothly travel on rough roads and roads that are not paved, or in cold regions or cold season roads where water freezes. Further, by engaging the cover locking projections 29 a of the plastic cover body 29 with the cover locking holes 22 e of the connection main body 22, the cover body 29 covers the surface of the connection main body 22, and the cover Since the body 29 is fixed to the connection main body 22, when the hand cart 10 is traveling, the connection main body 22 is not grounded and only the cover body 29 is grounded. For this reason, even if the cover body 29 is worn by the use of the hand cart 10 for many years, the connecting body 22 is not worn. As a result, since only the worn cover body 29 needs to be replaced, the repair cost of the hand cart 10 can be reduced.

<Second Embodiment>
10 to 13 show a second embodiment of the present invention. 11 to 13, the same reference numerals as those in FIGS. 1 and 7 denote the same components. In this embodiment, a sled member 61 that can slide on snow or grass is further provided. The sled member 61 includes a sliding portion 61a formed by bending the front portion and the rear portion upward and having a flat central portion, a caterpillar chain loose insertion hole 61b formed at the center of the sliding portion 61a, and the sliding portion 61a. Of these, a plurality of sled attachment portions 61c protruding from the periphery of the caterpillar chain loose insertion hole 61b are provided (FIG. 10). The sliding portion 61a is configured to be able to slide on snow or lawn by forming a flat center in the longitudinal direction. Further, the caterpillar chain loose insertion hole 61b is formed to extend in the longitudinal direction of the caterpillar chain 12 disposed along the outer peripheral surface of the pair of flange portions 67b, 67b of the rail member 67, and the caterpillar chain 12 can be loosely inserted. (FIGS. 11 and 13). A rectangular frame portion 61d protruding upward is formed on the periphery of the caterpillar chain loose insertion hole 61b (FIGS. 10 to 13).

  The sled attachment portions 61c project upward from the upper edge of the frame portion 61d, and the slant attachment portions 61c are respectively formed with engagement recesses 61e whose upper surfaces are open (FIGS. 10 and 12). . Also, a plurality of bosses 67c are respectively provided integrally with the rail base portion 67a on both side surfaces of the rail base portion 67a, and a plurality of sled attachment members 68 are respectively attached to the tips of these bosses 67c. (FIG. 11). The sled mounting member 68 includes a pair of fitting portions 68a into which the engagement concave portions 61e of the sled mounting portion 61c are fitted, and a pair of diameters larger than the fitting portions 68a provided at both ends of the fitting portion 68a. Flange portions 68b and 68b, and a boss insertion portion 68c to be inserted into and bonded to the boss 67c. Further, in a state where the plurality of sled attachment portions 61c are respectively attached to the plurality of sled attachment members 68, that is, in a state where the plurality of engagement recesses 61e are respectively attached to the plurality of attachment portions 68a. The bottom surface is configured to be positioned between the lower running portion of the caterpillar chain 12 and the sled attachment member 68 (FIGS. 11 and 13). 10 to 13 are a pair of side wall portions standing along both side edges of the sliding portion 61a. Reference numeral 67d in FIGS. 11 to 13 is an outer peripheral surface of the boss 67c. It is a reinforcing rib provided to reinforce the boss 67c. The warp member 61 is preferably formed of a weather resistant plastic such as 66 nylon. The configuration other than the above is the same as that of the first embodiment.

  The assembly procedure of the caterpillar traveling device 63 of the hand cart (manual carrier) 60 configured as described above is an endless caterpillar arranged along the outer peripheral surfaces of the pair of flanges 67b and 67b of the rail member 67. The caterpillar chain loose insertion hole 61b of the sled member 61 is loosely fitted to the chain 12, and the plurality of sled attachment portions 61c of the sled member 61 are respectively attached to the sled attached member 68 at the tip of the boss 67c of the rail member 67. Since it is the same as that of the first embodiment except that the engaging recess 61e is respectively fitted to the plurality of fitting portions 68a, repeated description is omitted. Further, the procedure for exchanging the caterpillar traveling device 63 with the wheel of the hand cart 60 is substantially the same as the exchanging procedure of the first embodiment, and therefore, repeated explanation is omitted. Further, in the operation of the hand cart 60 with the wheels replaced with the caterpillar traveling device 63, the bottom surface of the sliding portion 61 a is caterpillar with the sled member 61 surrounding the front, rear and both sides of the caterpillar chain 12. Since the lower portion of the chain 12 is located between the lower traveling portion of the chain 12 and the sled attachment member 68, the lower portion of the caterpillar traveling device 63 is buried in snow or lawn that is not pressure-contacted. It is kept on the lawn surface. As a result, the hand cart 60 can smoothly slide on snow or lawn. At this time, the caterpillar chain 12 may or may not circulate on the pair of flanges 67b and 67b depending on the hardness of snow or the like. Further, when the hand cart 60 travels on a snow surface that is in pressure contact, or travels on a hard road surface such as soil or asphalt, the sled member 61 is kept floating from the road surface. As a result, the hand cart 60 can smoothly travel on the snow surface pressed or a hard road surface such as soil or asphalt by the caterpillar chain 12. Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

<Third Embodiment>
FIG. 14 shows a third embodiment of the present invention. 14, the same reference numerals as those in FIG. 6 denote the same components. In this embodiment, there is provided a stopper 81 whose base end is attached to the travel bracket 86 and whose front end is in contact with the caterpillar chain 12. Specifically, the traveling horizontal piece 86a of the traveling bracket 86 is provided to extend rearward, and the stopper 81 includes a stopper holding portion 81a attached to the upper surface of the rear end of the traveling horizontal piece 86a, and the stopper holding. A stopper main body 81b provided integrally with the rear end of the portion 81a and projecting obliquely downward and forward toward the caterpillar chain 12; The stopper 81 is preferably formed of a weather resistant plastic such as 66 nylon. When the caterpillar chain 12 rotates in one direction indicated by the solid line arrows in FIGS. 14A and 14B, the stopper main body 81b comes into contact with the caterpillar chain 12 and elastically deforms. When rotation is allowed and the caterpillar chain 12 rotates in the other direction indicated by the broken-line arrow in FIG. 14C, the tip of the stopper body 81b comes into contact with the stepped portion of the outer peripheral surface of the caterpillar chain 12, thereby Rotation to is prevented. The configuration other than the above is the same as that of the first embodiment.

  In the push cart (manual carrier) configured in this way, the stopper 81 allows the caterpillar chain 12 to rotate to one side and prevents the caterpillar chain 12 from rotating to the other, so the push cart is moved forward. You can, but you can't go backwards. As a result, it is possible to prevent unintentional reverse travel of the hand cart. Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

<Fourth embodiment>
FIG. 15 shows a fourth embodiment of the present invention. 15, the same reference numerals as those in FIG. 8 denote the same components. In this embodiment, the manual carrier 100 is a rear car, and a mounting upper bracket 103 in which a loading platform side through hole (not shown) is formed is attached to the lower portion of the loading platform 101. Further, the mounting lower bracket 32 is engaged with the mounting upper bracket 103 so that the loading platform side through hole (not shown) and the traveling side through hole (not shown) are aligned with each other. The loading platform 101 is attached to the caterpillar traveling device 13 by inserting the horizontal pin 36 through the traveling side through hole. Since the rear car 100 has a pair of wheels 105, these wheels 105 are replaced with a pair of caterpillar traveling devices 103, respectively. Further, reference numeral 104 in FIG. 15 denotes a handle member held by the operator. The configuration other than the above is the same as that of the first embodiment.

  A procedure for exchanging the wheel 105 of the rear car 100 configured as described above with the caterpillar traveling device 13 will be described with reference to FIG. First, the wheel 105 (FIG. 15A) of the rear car 100 is removed from the loading platform 101. Next, the horizontal pin 36 is inserted into the pair of traveling side through holes of the mounting lower bracket 32 of the caterpillar traveling device 13, and receiving nuts (not shown) are screwed to both ends of the horizontal pin 36. Next, a pair of cargo bed side through holes (not shown) provided in the pair of upper vertical pieces 103a of the mounting upper bracket 103 attached to the lower part of the cargo bed 101 are fitted into both ends of the horizontal pin 36, respectively. Further, a presser nut 38 is screwed to both ends of the horizontal pin 36, and the lower part of the left upper vertical piece 103a is clamped by the receiving nut and the presser nut 38. Although not shown, the lower part of the right upper vertical piece is received by the receiving nut. And clamped with a presser nut. The above operation is performed on the pair of wheels 105, that is, the pair of wheels 105 is replaced with the pair of caterpillar traveling devices 13, respectively. Thereby, the replacement of the wheel 105 with the caterpillar traveling device 13 is completed (FIG. 15B). Thus, the caterpillar traveling device 13 can also be applied to the rear car 100. Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

<Fifth embodiment>
FIG. 16 shows a fifth embodiment of the present invention. 16, the same reference numerals as those in FIG. 9 denote the same components. In this embodiment, the hand cart (manual carrier) 120 has three wheels (not shown), and these wheels are respectively replaced with three caterpillar traveling devices 13. This hand cart 120 has a front single shaft and a rear single shaft, and a single front wheel (not shown) is rotatably attached to the front single shaft via a single first mounting upper bracket 131. A pair of rear wheels (not shown) are rotatably mounted via a pair of second mounting upper brackets 132. The single first mounting upper bracket 131 is attached to the center of the front lower surface of the loading platform 121, and the pair of second mounting upper brackets 132 are respectively attached to both sides of the rear lower surface of the loading platform 121. A single front wheel is replaced with a single caterpillar traveling device 13, and a pair of rear wheels are replaced with a pair of caterpillar traveling devices 13. Specifically, the lower bracket 32 for mounting the single caterpillar traveling device 13 is attached to the single first mounting upper bracket 131 via the horizontal pin 36, and the pair of second mounting upper brackets 132 are attached to the single first mounting upper bracket 131. Lower brackets 32 for attachment of the pair of caterpillar traveling devices 13 are attached via horizontal pins 36, respectively. Further, reference numeral 131a in FIG. 16 is a first upper vertical piece of the first mounting upper bracket 131, and reference numeral 132a is a second upper vertical piece of the second mounting upper bracket 132. The configuration other than the above is the same as that of the first embodiment.

  The hand cart (manual carrier) 120 configured as described above can travel relatively smoothly on the road 39 having undulations while suppressing the inclination of the loading platform 121. Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

<Sixth Embodiment>
17 to 19 show a sixth embodiment of the present invention. 17 and 18, the same reference numerals as those in FIGS. 6 and 8 denote the same components. In this embodiment, a hand cart (manual carrier) 150 has five wheels (not shown), and these wheels are a single first caterpillar traveling device 151 and a pair of second caterpillar type. The travel devices 152 and 152 are respectively replaced. This manual carrier 150 has a front single shaft and a rear double shaft, and a single front wheel (not shown) is rotatably attached to the front single shaft via a single first mounting upper bracket 191. Two pairs of rear wheels (not shown) are rotatably mounted on the rear two shafts via two pairs of second mounting upper brackets 192 and 192, respectively. Then, the single front wheel is replaced with a single first caterpillar traveling device 151, and the two pairs of rear wheels are replaced with a pair of second caterpillar traveling devices 152, 152, respectively (FIGS. 18 and 19). . In the single first caterpillar type traveling device 151 attached to the center of the front lower surface of the loading platform 201 in place of the front wheel, a horizontal turning mechanism 207 described later is provided between the first traveling bracket 161 and the mounting lower bracket 202. Provided (FIG. 17).

  Further, in the pair of second caterpillar type traveling devices 152 and 152 attached to both sides of the lower rear portion of the loading platform 201 instead of the two pairs of rear wheels, the second traveling bracket 162 formed longer than the first traveling bracket 161 is used. Two mounting lower brackets 202, 202 are attached to the upper surface of the upper and lower surfaces with a space in the front-rear direction (FIG. 18). Further, the second rail member 172 of the second caterpillar traveling device 152 is formed longer in the front-rear direction than the first rail member 171 of the first caterpillar traveling device 151, and the second caterpillar chain 182 of the second caterpillar traveling device 152. Is formed longer than the first caterpillar chain 181 of the first caterpillar traveling device 151. Then, the lower bracket 202 for mounting the single first caterpillar traveling device 151 is mounted to the single first mounting upper bracket 191 via the horizontal pin 36, and the two left second mounting upper brackets 192 are mounted. , 192, two mounting lower brackets 202, 202 of the second caterpillar traveling device 152 are mounted via two horizontal pins 36, 36, and two second mounting upper brackets (not shown) on the right side. Two mounting lower brackets (not shown) of the second caterpillar traveling device 152 are attached via two horizontal pins (not shown). In FIG. 18, reference numeral 191a is a first upper vertical piece of the first mounting upper bracket 191, and reference numeral 192a is a second upper vertical piece of the second mounting upper bracket 192.

  On the other hand, the horizontal turning mechanism 207 has a turning support plate 208 attached to the upper surface of the first traveling bracket 161, and a vertical shaft 209 inserted through the turning support plate 208 and the attachment lower bracket 202 (FIG. 17). . The first traveling bracket 161 is attached not to the center of the first rail member 171 in the front-rear direction but to the front portion of the first rail member 171. Further, the swivel support plate 208 is provided with a plurality of support protrusions 208a formed at equal intervals around the vertical shaft 209 so as to slidably receive the lower surface of the lower mounting bracket 202. In the center of the turning support plate 208, a first recess 208b capable of accommodating the washer 211 is formed. The vertical shaft 209 is configured by a stepped bolt including a head portion 209a, a shaft portion 209b, and a male screw portion 209c, and the washer 211 is formed with a second recess 211a capable of accommodating the head portion 209a of the vertical shaft 209. Further, with the washer 211 fitted into the shaft portion 209b of the vertical shaft 209 and the head portion 209a of the vertical shaft 209 accommodated in the second recess 211a of the washer 211, the vertical shaft 209 is moved to the turning support plate 208 and the mounting lower. By inserting the bracket 202, the washer 211 is accommodated in the first recess 208b. Then, the fixing nut 212 is screwed into the male screw portion 209c of the vertical shaft 209, so that the vertical shaft 209 holds the mounting lower bracket 202 in a rotatable manner. In this state, the turning support plate 208 is attached to the upper surface of the first traveling bracket 161 by bolts 213 and nuts 214. Here, the first traveling bracket 161 is attached to the front portion of the first rail member 171 and the turning support plate 208 is positioned at the front portion of the first rail member 171 to facilitate turning of the hand cart 150. It is to make it. In this embodiment, two sets of the reinforcing tools 41 of the mounting lower bracket 202 are provided. The configuration other than the above is the same as that of the first embodiment.

  In the hand cart (manual carrier) 150 configured as described above, the horizontal turning mechanism 207 is provided between the first traveling bracket 161 and the lower mounting bracket 202 of the first caterpillar traveling device 151. The direction of the loading platform 201 can be changed by rotating the handle member 204 left or right with respect to the traveling direction of the first and second caterpillar traveling devices 151 and 152. Here, since the first traveling bracket 161 is attached to the front portion of the first rail member 171, and the turning support plate 208 is positioned at the front portion of the first rail member 171, the hand cart 150 is moved straight. In this state, when the handle member 204 is pushed diagonally right or diagonally left with respect to the traveling direction of the first and second caterpillar traveling devices 151 and 152, the first caterpillar traveling device 151 quickly turns left or right. When the handle member 204 is pushed forward of the loading platform 201 after the loading platform 201 is turned by a desired angle, the first caterpillar type traveling device 151 is directed in the same direction as the loading platform 201, and the hand cart 150 is moved in that direction. You can go straight. As a result, the hand cart 150 can be turned left or right relatively smoothly (FIG. 19). Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

<Seventh embodiment>
FIG. 20 shows a seventh embodiment of the present invention. 20, the same reference numerals as those in FIG. 7 denote the same components. In this embodiment, the upper part of the pair of flange parts 237b of the rail member 237 is formed to curve in a direction approaching the lower part. That is, the upper part of the pair of flange portions 237b of the rail member 237 is formed in an arcuate shape that curves downward. For this reason, the upper surface of the rail base 237a of the rail member 237 is not horizontal, but is formed as a curved surface that curves in a direction approaching the lower surface. Further, the upper traveling portion of the caterpillar chain 232 is also configured to bend in a direction approaching the lower traveling portion. The configuration other than the above is the same as that of the first embodiment.

  In the hand cart (manual carrier) 230 configured as described above, the upper portion of the pair of flange portions 237b is formed to bend in a direction approaching the lower portion, so that the traveling bracket 16 and the mounting lower bracket are mounted. The positions of the upper bracket 31 and the mounting upper bracket 31 are lower than those of the first embodiment. As a result, the center of gravity of the loading platform can be lowered, and the load placed on the loading platform can be transported in a stable state. Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

<Eighth Embodiment>
FIG. 21 shows an eighth embodiment of the present invention. 21, the same reference numerals as those in FIG. 7 denote the same components. In this embodiment, the lower curvature radius R ₂ of the curved portions of the front end portion and the rear end portion of the pair of flange portions 257b is formed larger than the upper curvature radius R ₁ . For this reason, the lower curvature radius of the curved portion of the front end portion and the rear end portion of the rail base portion 257a of the rail member 257 is also formed larger than the upper curvature radius. In this embodiment, the upper curvature radius R ₁ in the curved portion of the front end portion and the rear end portion of the pair of flange portions 257b is the curved portion of the front end portion and the rear end portion of the pair of flange portions of the first embodiment. The lower curvature radius R ₂ of the curved portion of the front end portion and the rear end portion of the pair of flange portions 257b is the same as that of the pair of flange portions of the first embodiment. It is formed larger than the radius of curvature R (FIG. 7) at the curved portion of the front end portion and the rear end portion. The configuration other than the above is the same as that of the first embodiment.

In the hand cart (manual carrier) configured as described above, the lower curvature radius R ₂ at the curved portion of the front end portion and the rear end portion of the pair of flange portions 257 b is formed larger than the upper curvature radius R _1. Therefore, when the front part of the caterpillar chain 252 is brought into contact with a relatively high step, the upper part of the front end of the caterpillar chain 252 covers the upper edge of the relatively high step. As a result, when the hand cart 250 is moved forward as it is, even if it is a relatively high step, the relatively high step can be easily overcome with a small force, or a relatively high step can be easily performed with a small force. You can get on. Since the operation other than the above is substantially the same as the operation of the first embodiment, repeated description will be omitted.

  In the first to third, seventh, and eighth embodiments, a hand cart (so-called cat car) is used as the manual carrier, and in the fourth embodiment, a rear car is used as the manual carrier. For example, in the fifth embodiment, as a manual transporter, the front wheel, the rear shaft, a single front wheel, and a pair of rear wheel manual transporters are replaced by three caterpillar traveling devices. In the sixth embodiment, the five wheels of a manual carrier having a front single shaft, a rear two shafts, a single front wheel, and two pairs of rear wheels are used as a manual carrier. Although the handcart transport vehicle replaced with the traveling device has been described, the present invention can also be applied to a manual transporter such as a handcart for elderly people (so-called silver car). In the second embodiment, the front part and the rear part of the sliding part of the sled member are curved upward, but only the front part of the sled member may be curved upward. Furthermore, in the sixth embodiment, a plurality of support protrusions formed on the swivel support plate at equal intervals around the vertical axis so as to slidably receive the lower surface of the mounting lower bracket. However, the swivel support plate may be provided with a single support protrusion formed in a circular shape around the vertical axis so as to slidably receive the lower surface of the lower bracket for mounting.

10, 60, 120, 150, 200, 220 Handcart (manual carrier)
11, 101, 121, 201 Loading platform 12,181,182,232,252 Caterpillar chain 13,63,151,152 Caterpillar traveling device 14,104,204 Handle member 16,86,161,162 Traveling bracket 17,67 , 171, 172, 237, 257 Rail member 17 a, 67 a, 237 a, 257 a Rail base part 17 b, 67 b, 237 b, 257 b 鍔 part 21 connection tool 22 connection body 22 e cover locking hole 23 connection side part 23 c connection member Stop projection 24 Connection bent portion 26 Roller 27 Pin shaft 28a Locked hole for connection 29 Cover body 29a Lock protrusion 31, 103, 131, 132, 161, 162 Upper bracket for mounting 31b Notch 32, 202 Lower bracket for mounting 32c Traveling side Hole 36 horizontal pin 61 sled member 61a runner 61b track chain loose insertion hole 61c sled mounting portion 67c bosses 68 sled the mating member 81 stopper 100 Carts (manual vehicles)
207 Horizontal turning mechanism 208 Turning support plate 208a Support projection 209 Vertical axis

Claims (11)

A manual carrier comprising: a loading platform on which a load is placed; a caterpillar traveling device that is removably attached to a lower portion of the loading platform and travels by a caterpillar chain; and a handle member that is provided on the loading platform and is gripped by an operator. ,
The caterpillar traveling device is
A traveling bracket removably attached to a lower part of the loading platform;
A rail base that is attached to the lower portion of the traveling bracket and extends in the front-rear direction and has a front end portion and a rear end portion that are curved in a vertical plane and extends outward from both side edges of the rail base portion and is formed in an oval shape. A rail member formed by integral molding of plastic with a pair of flanges,
The caterpillar configured to move and circulate along the pair of hooks by connecting a plurality of plastic couplers to each other and arranging the couplers along the outer peripheral surface of the pair of hooks and forming endlessly. A manual carrier having a chain. The plurality of coupling tools are a plurality of coupling main bodies arranged along the outer peripheral surfaces of the pair of flanges, a pair of coupling side portions suspended from both sides of each coupling main body, and the coupling side thereof Each having a pair of connecting bent portions that slide on the inner peripheral surfaces of the pair of flanges, disposed at the respective lower ends of the portions,
The connector is formed by integral molding of the connecting body, the pair of connecting side portions, and the pair of connecting bent portions;
The manual carrier according to claim 1, wherein a plurality of rollers capable of rolling on the outer peripheral surfaces of the pair of flanges are rotatably attached to the coupler via a pin shaft.   A plurality of cover locking holes are formed in the connection main body, and a plurality of cover locking protrusions project from the back surface of the plastic cover body that covers the surface of the connection main body. The manual carrier according to claim 2, wherein the cover body is fixed in a state of covering the surface of the connecting body by engaging a protrusion with the plurality of cover locking holes.   A pair of connection locking projections project from the outer surfaces of one end of the pair of connection side portions, respectively, and a pair of connection locked holes are formed on both side portions of the other end side of the connection main body. The pair of connecting locking projections of the tool are locked in the pair of connected locking holes of the connecting tool adjacent to the connecting tool, and the pair of connecting locking protrusions of the adjacent connector are connected to the adjacent connecting tool. The manual carrier according to claim 2, wherein the caterpillar chain is configured by repeating a locking structure that locks into a pair of locking holes for coupling of a coupling tool further adjacent to the jig. Further comprising a sled member capable of sliding on snow or grass,
The sled member has a front part or a front part and a rear part that are curved upward and a flat center part that can slide on snow or grass, and a rail part that is formed at the center of the sliding part. A caterpillar chain loose insertion hole in which the attached caterpillar chain can be loosely inserted, and a plurality of sled attachment portions projecting from the periphery of the caterpillar chain loose insertion hole in the sliding portion,
A plurality of bosses are provided on both side surfaces of the rail base, respectively, integrally with the rail base toward the outside,
A plurality of sled attachment members are respectively attached to the tips of the plurality of bosses,
The bottom surface of the sliding portion is positioned between the lower running portion of the endless caterpillar chain and the sled mounting member in a state where the plurality of sled mounting portions are respectively mounted on the plurality of sled mounting members. The manual carrier according to any one of claims 1 to 3, which is configured as follows.   A stopper is provided with a base end attached to the traveling bracket and a distal end abutting against the caterpillar chain. The stopper allows the caterpillar chain to move to one side and prevents the caterpillar chain from moving to the other side. The manual carrier according to claim 1, which is configured as follows.   A mounting upper bracket having a notch or a loading platform side through hole formed at a lower portion of the loading platform is provided, and an upper surface of the traveling bracket faces the mounting upper bracket and the notching portion or the loading platform side passage is provided. A lower mounting bracket is provided in which a traveling side through hole that can communicate with the hole is provided, and the lower mounting bracket is engaged with the upper mounting bracket so that the notched portion or the loading platform side through hole and the traveling 2. The loading platform is attached to the caterpillar type traveling device by inserting a horizontal pin through the notch or the loading platform side through hole and the traveling side through hole in a state where the side through holes are aligned. Manual carrier. A horizontal turning mechanism is provided between the traveling bracket and the mounting lower bracket,
The horizontal turning mechanism is mounted on the upper surface of the traveling bracket and provided with a support protrusion or support protrusion that slidably receives the lower surface of the lower mounting bracket, the turning support plate, The manual carrier according to claim 7, further comprising: a vertical shaft that is inserted into the lower mounting bracket and rotatably holds the lower mounting bracket.   The manual carrier according to claim 1, wherein the upper parts of the pair of collars are curved in a direction approaching the lower part.   The manual carrier according to claim 1, wherein a lower radius of curvature of the curved portion of the front end portion and the rear end portion of the pair of flanges is formed larger than the upper radius of curvature.   A caterpillar traveling device used in the manual transporter according to claim 1.

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