JP6274695B2 - Truck roll transport cart - Google Patents

Description

  The present invention relates to a truck roll type transport cart.

Hand-carried transport carts are widely used in manufacturing factories and the like as simple means of transporting materials and products. In general, wheels are used as a traveling mechanism of the hand-held transport cart.
The transport cart needs to have a certain wheel diameter in order to get over the level difference of the travel path. However, there is a limit to deal with a large level difference only by the size of the wheel. Further, in the case of a transporting carriage using wheels, when the traveling road surface is uneven, the load at the time of starting is large, and rattling, impact, and noise during traveling may become a problem.

2. Description of the Related Art As a technique that pays attention to the above-described problems such as road surface steps and rattling during travel, a transport cart that uses a caterpillar (registered trademark, the same applies hereinafter) as a travel mechanism is known. Patent Document 1 describes an invention of a transport cart in which wheels on both the left and right sides are set as a set, and a caterpillar is mounted between both sets of wheels.
In addition, there is known a glass ski technique having a mechanism similar to a caterpillar in that a rotating belt is used as a traveling mechanism. This is used as a running mechanism for a glass ski tool that is a sport that slides on a grassy slope, and Patent Document 2 describes the mechanism.

In the conveyance cart of patent documents 1, compared with the conveyance cart which uses a wheel by using a caterpillar, it can respond to a certain level to some extent. However, in the first place, it cannot be driven manually and cannot be driven manually, the load is heavy, it is not easy to travel along a curve, it cannot be rotated on the spot, noise is generated depending on the road surface condition, the weight of the vehicle body is large, etc. There was a problem.
The inventors have adopted the track roll mechanism described in Patent Document 2 as a traveling mechanism of the transportation carriage to solve the above-mentioned problems in the transportation carriage, reducing the traveling load, getting over a large step and following a curve. Produced a truck roll type transport cart that can easily run and rotate on the spot, can run quietly regardless of the road surface condition, and has a low body weight, and filed a patent application. .

JP 07-277199 A Patent No. 5336641

However, the track roll type transport cart has a problem that it is not always easy to achieve both stability during straight running and rotational running when wearing a curve, that is, the shape of the contact surface of the track roll is convex downward. In the straight running, there is a problem that the wobbling occurs in the vertical direction in the front-rear direction, and if the shape of the ground contact surface is made flat, the rotational running property is deteriorated. In addition, there are problems in assembling and durability of parts constituting the grounding portion, storage performance and transportability of the transport carriage itself when not traveling.

  The present invention solves the above-mentioned problems, and both straight running and rotary running can be performed easily and stably, and the grounding part parts are excellent in assemblability and durability. It is an object of the present invention to provide a truck roll type transport cart that can be easily transported.

In order to solve the above-mentioned problems, the invention of claim 1 is a track roll type transport cart including a travel unit, a transport base unit, and a support structure connecting them, and the travel unit is a track roll transport cart. Two sets of left and right annular rails with respect to the traveling direction of the frame, a frame for shaping and holding the rails and mounting a support structure, a plurality of elements arranged on the rail and supporting a plurality of rollers, and an element It has a pair of left and right track rolls consisting of a belt that is held at a constant interval and a plurality of plates that fix the element and the belt, and one or more auxiliary wheels are provided between the pair of left and right track rolls. The transport table is connected to the traveling unit via a support structure connected to the bottom surface of the transport table, and includes a handle on the rear end side with respect to the traveling direction, and the frame is In the longitudinal direction of the center of the track roles for each longitudinal sectional shape of the lower portion of the annular rail has a retraction mechanism to depress the convex down, rail and having a flat cross-sectional shape .
The invention of claim 2 is further characterized in that the plurality of plates have a shape in which the ground surface is diamond-cut and are fastened to the element by screws.

  According to the present invention, it is possible to easily travel over a large level difference, travel along a curve, and easily rotate on the spot, and can travel quietly regardless of the road surface state, and both linear travel and rotational travel are possible. There is provided a track roll type transport cart that can be easily and stably performed, and can be easily assembled and durable for grounding parts, and can be easily stored and transported when the transport cart is not running.

It is a perspective view of the truck roll type conveyance cart of the present invention. (A) Front view and (b) Left side view. (A) Top view and (b) Bottom view. FIG. 4 is an enlarged perspective view of a-a ′ and b-b ′ portions of FIGS. 2 and 3. FIG. 3 is an enlarged view of an a-a ′ portion in FIG. 2. It is AA sectional drawing of FIG. It is a figure which shows the 1st Example of this invention, (a) is a normal state, (b) is a front view at the time of tilting operation | movement. It is a schematic diagram for demonstrating a retract mechanism. It is a figure which shows the structure by which the auxiliary wheel was installed, (a) Front view and (b) Back view are two auxiliary wheels in the back of a conveyance trolley, (c) and (d) are two auxiliary wheels conveyed. (E), (f) shows a configuration in which one auxiliary wheel is installed in the center of the transport cart, and (g), (h) shows a configuration in which two auxiliary wheels are installed in front and rear of the transport cart. . FIG. 5 is a detailed view of attaching the roller unit to the belt. It is detail drawing of a plate. It is detail drawing of an element. It is an assembly sectional view of a run part. It is a figure which shows the application example of the track-roll type conveyance trolley | bogie of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
First, the configuration of the present embodiment will be described.
As shown in FIGS. 1 and 7, the track roll type transport cart 10 (hereinafter referred to as the transport cart 10) includes a traveling unit 20, a transport platform 30, and a support structure 40 that connects these. The traveling unit 20 includes two sets of left and right annular rails 2 with respect to the traveling direction of the transport carriage 10, and a frame 3 that holds the rails 2 in shape and attaches a support structure 40. A plurality of elements 4 that support a plurality of rollers 7 are disposed on the rail 2, and a belt 5 that holds the elements 4 at a constant interval is disposed around each of the two sets of annular rails 2. . The element 4 and the belt 5 are fixed by a plate 6. The pair of left and right traveling devices of the traveling unit 20 is referred to as a track roll 1. One or more auxiliary wheels 21 are provided between the two track rolls 1. The transport table 30 is connected to the traveling unit 20 via a support structure 40 connected to the bottom surface of the transport table 30 and includes a handle 31 on the rear end side with respect to the traveling direction. The lower frame 3b has a retract mechanism 50 (FIG. 8) that pushes down the longitudinal cross-sectional shape of the lower portion 2a of the annular rail downward in the center in the front-rear direction of the track roll 1 with respect to the traveling direction.

  As shown in FIG. 8, the retract mechanism 50 has a rack-pinion structure that operates the lever 50e to rotate the pinion 50c connected to the fulcrum shaft 50d to move the block 50a connected to the rack 50b up and down. The block 50a is moved in and out from the frame 3b. The lever 50e is fixed by a stopper (not shown) at the protruding corresponding position P and the retracting corresponding position Q of the block 50a.

The annular rail 2 has a flat cross-sectional shape as shown in FIGS. 6 and 13, and the plate 6 has a substantially quadrangular pyramid diamond cut centered on the ground surface 6a as shown in FIG. While having the applied shape, it is fastened to the element 4 at the position of the hole 6d by two screws. The material of the plate 6 is hard rubber.
In this embodiment, the inter-surface dimension R between the attachment surface 6b of the plate 6 to the element 4 and the grounding surface 6a of the plate 6 is about 8 mm. However, R is set to 10 mm or more to cope with a soft road surface (described later). It is also possible to plan.

  As shown in FIGS. 1 to 3, the transport table 30 includes a first recess 34 a that stores the handle 31 by rotating the handle 31 around a fulcrum 32 below the handle 31, and a handle 33 at the rear end of the transport table 30. A second recess 34b to be stored and a third recess 34c serving as a storage groove for the track roll 1 when a plurality of track roll type transport carts 10 are stacked and arranged.

As shown in FIG. 6 and FIG. 13, the rail 2 has a shape in which the longitudinal section of the track is substantially elliptical and has a concave top, and the belt 5 is disposed around the rail 2 together with the elements 4. The cross section of the rail 2 has a flat shape, and is easier to manufacture and assemble than a conventional uneven cross section.
As shown in FIGS. 10 and 13, side guides 8 are disposed in the element 4 at positions where the rails 2 are sandwiched from above and below in pairs with the rollers 7.

The element 4, the plate 6, the roller 7, and the side guide 8 shown in FIG. 10 are collectively referred to as a roller unit 9. FIG. 10 shows details of how the roller unit 9 and the belt 5 are attached.
The element 4 (FIG. 12) to which the roller 7 is rotatably attached is assembled so as to sandwich the annular rail 2 together with the side guide 8 having the sliding surface 8a (FIG. 13). The element 4 has a columnar convex portion 4 c, passes through a hole portion 5 a formed in the belt 5, and is fitted into and fixed to the hole portion 6 c of the plate 6.

  The side guide 8 has a plurality of projections corresponding to a plurality of fitting holes provided on the side wall of the element 4 and holds the element 4 slidably after the element 4 is installed on the rail 2. . From this assembly structure, a predetermined clearance is required between the rail 2 and the sliding surface 8a of the side guide 8 as shown in FIG.

The function and effect of the transport carriage 10 of this embodiment will be described.
A predetermined tension is applied to the belt 5, and each roller unit 9 receives an upward force from the belt 5 in the upper part of the rail 2 due to the tension. As a result, as shown in FIG. 13, when the traveling belt 5 rotates and one roller unit 9 moves on the upper part of the rail 2, the roller 7 of the roller unit 9 moves away from the rail 2 and is opposed to the roller 7. The side guide 8 that forms the side slides in contact with the sliding surface 2 b of the rail 2.
When the roller unit 9 is positioned below the annular rail 2, the roller 7 abuts on the sliding surface 2 b of the rail 2 and rotates to move.
As described above, the resistance of rotational movement of the belt 5 as a whole can be reduced by sliding the side guide 8 and the rail 2 and moving the roller unit 9 at the upper part of the rail 2. The traveling speed can be improved.

Moreover, the conveyance base part 30 is arrange | positioned back from the center of the front-back direction of the flame | frame 3 with respect to the advancing direction via the support structure 40 connected to the bottom face of the conveyance base part 30 as mentioned above. Since the center point of the frame 3 itself is located at the center of the annular rail 2 in the front-rear direction, the support structure 40 is disposed behind the center of the track rail 1 in the front-rear direction. Thereby, the highest position of the front end portion of the track roll 1 is configured to be higher than the highest position of the rear end portion, and the transport cart 10 has improved absorption capacity for unevenness on the road surface, and can travel more smoothly.
Furthermore, as shown in FIG. 7B, when the handle 31 is tilted backward, the tip of the track rail 1 can be lifted higher because the fulcrum is at the rear, and the transport carriage 10 can be stepped by a small tilting operation. Make it easy to get on. This is easy to understand when compared with a conventional wheeled carriage as shown in FIG.
With the above-described configuration, the transport cart 10 can be easily rotated on the spot, climbed over a large level difference, traveled diagonally over the level difference, and the like.

  The retract mechanism 50 is intended to make it easier for the transport carriage 10 to rotate on the spot or run in a curved line. As shown in FIG. 8, the block 50a is housed in the lower frame 3b during straight running. Has been. When the lever 50e is switched during rotation traveling or curved traveling, the fulcrum shaft 50d of the lever 50e rotates, and the rack 50b connected to the block 50a descends due to rotation of the pinion 50c arranged on the same axis. 50a protrudes from the lower surface of the lower frame 3b. At this position P, the lever 50e is fixed by a stopper (not shown), and the block 50a is fixed at the protruding position. As a result, the center of the lower side of the annular rail 2 has a downwardly convex shape, so that the transport carriage 10 can be more easily rotated on the spot or curved. By returning the lever 50e to the original position Q, the block 50a is again accommodated in the lower frame 3b, and the lower portion 2a of the annular rail 2 returns to a flat shape, so that the conditions suitable for straight traveling of the transport carriage 10 are satisfied. Can be switched. The state in which the annular rail 2 projecting from the block 50a is downwardly convex is suitable for on-the-spot rotation and curved traveling, but is suitable because the vertical wobbling in the front-rear direction of the transport carriage 10 increases during linear traveling. There is no.

  As shown in FIGS. 9A to 9H, auxiliary wheels 21 are provided between the two track rolls 1 on the back surface of the transport table 30. Each of the four embodiments shown contributes to smoother travel of the transport carriage 10 by preventing wobble and the like during the straight travel, the rotational travel, and the curvilinear travel.

The annular rail 2 has a flat cross-sectional shape as shown in FIGS. 6 and 13 and can be easily manufactured and can easily cope with the shape change caused by the retract mechanism 50 described above.
As shown in FIG. 11, the plate 6 has a shape with a substantially square pyramid diamond cut centered on the ground surface 6a, which reduces resistance during running and improves curve running performance. Can be made. In addition, since it is a simple assembly structure that is fastened to the element 4 with two screws, the manufacturing cost can be reduced. By using a hard rubber material, the friction coefficient and wear strength can be improved compared to conventional plastics.

  If the inter-surface dimension R between the mounting surface 6b of the plate 6 to the element 4 and the grounding surface 6a of the plate 6 is 10 mm or more and the specification is thicker than usual, mud inside the element 4 will be generated when traveling on soft road surfaces Thus, it is possible to enhance the function of preventing the intrusion of foreign matters such as, and to maintain good running performance for a longer time.

  As shown in FIGS. 1 to 3, the handle 31 is rotated about a lower fulcrum 32 and can be stored in the recess 34 a of the transport table surface 30 a. After the handle 31 is stored, the recess 34 b is stored. The carrying cart 10 can be easily carried by pulling out the handle 32 from the rack. Further, when the transport carts 10 are stacked and stored, the space saving effect can be exhibited by storing the track roll 1 of the upper transport cart 10 in the recess 34c.

  Further, the transport cart 10 of the present embodiment can travel quietly regardless of the road surface condition, the device itself is lightweight and easy to carry, and the travel mechanism of the track roll 1 firmly secures the road surface as the transport object is loaded. Since it rotates smoothly, it has many excellent performances such as reducing the transport load. Since it is excellent in durability, it can be widely used as a transport cart, as an alternative to conventional caster carts, and others. For example, by arranging various sizes, as shown in FIG. 14, it can be applied to (a) buggy, (b) airplane cart, hospital (c) bed, (d) wheelchair, cart, etc. (E) It can also be applied to a lift truck in a factory.

DESCRIPTION OF SYMBOLS 1 Track roll 2 Annular rail 2a Lower part 2b Sliding surface 3 Frame 3a Upper frame 3b Lower frame 4 Element 5 Belt 6 Plate 7 Roller 8 Side guide 9 Roller unit 10 Track roll type transport carriage 20 Traveling part 21 Auxiliary wheel 30 Transport base Portion 30a Carriage surface 31 Handle 32 Support point 33 Handle 34a First recess 34b Second recess 34c Third recess 40 Support structure 50 Retract mechanism 50a Block 50b Rack 50c Pinion 50d Support shaft 50e Lever

Claims (2)

A track roll type transport cart including a traveling unit, a transport table unit, and a support structure that connects them,
The traveling unit is disposed on the rails, two sets of left and right annular rails with respect to the traveling direction of the track roll type transport carriage, a frame that holds the rails in shape and attaches the support structure. And a pair of left and right track rolls comprising a plurality of elements for supporting a plurality of rollers, a belt for holding the elements at regular intervals, and a plurality of plates for fixing the elements and the belt. One or more auxiliary wheels are provided between the pair of track rolls,
The transport table is connected to the travel unit via the support structure connected to the bottom surface of the transport table, and includes a handle on the rear end side with respect to the traveling direction.
The frame in the longitudinal direction of the center of the truck rolls with respect to the direction of travel, have a retract mechanism depressing the longitudinal section of the lower portion of the annular rail convexly downward, the rail is a flat cross It has a surface shape,
A truck roll type transport cart characterized by that. The track roll type transport carriage according to claim 1, wherein the plurality of plates have a shape in which a ground contact surface is diamond-cut and are fastened to the element by screws.

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