JP2005075063A - Truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a truck having a small turning circle with a simple structure by interlocking the direction of wheels at the time of traction, and capable of easily switching rear wheels to be rotatable to the horizontal direction by fixing a front wheel in the advancing direction at the time of pushing by hand. <P>SOLUTION: This truck is provided with a first steering mechanism 5 for steering a direction of a caster wheel 3a of one end side 1a of a base 2 to a same direction with a tilting direction of a traction member 4, a second steering mechanism 6 for steering a direction of a caster wheel 3b of the other end side 1b to the direction opposite from the tilting direction of the traction member 4, and a pushing handle 7 attached on the one end side 1a of the base 2. A fitting part 8 is provided on the first steering mechanism 5, the fitting of the fitting part is released under the pushed condition, and thereby the direction of the caster wheel 3a of the one end side 1a can be varied regardless of the tilting direction of the traction member 4. A fixing part 9 is provided so that a direction of the caster 3b of the other end side 1b can be fixed in the advancing direction under the pushed condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bogie, and more specifically, in order to allow a small turn when towing, the horizontal direction of caster wheels is made to be opposite to each other on one end side and the other end side of the bogie. The present invention relates to a cart having a towed function.

  FIGS. 5 and 6 show an example of a conventional cart that can turn in a small turn when towing. 5 and 6 are diagrams showing a carriage 21 disclosed in Patent Document 1, wherein 22 is a stage on which a load is mounted, and 23 is provided at both left and right ends of one end side 21a and the other end side 21b of the stage 22, respectively. A caster wheel (hereinafter, the caster wheel 23 on the one end side 21a may be represented by reference numeral 23a, and that on the other end side 21b may be represented by reference numeral 23b), 24 indicates the direction of each caster wheel 23 at one end side 21a and the other end of the carriage 21. A steering mechanism 25, which is connected so as to face in the opposite direction on the side 21 b, is a traction member attached to one end side of the steering mechanism 24 so as to be tiltable up and down.

  The steering mechanism 24 includes a steering plate 24a provided at a central portion in the left-right direction on one end side 21a of the carriage 21 so as to be tiltable in a horizontal direction about a vertical rotation shaft 24o, and the other end side of the steering plate 24a. Link rods 24b and 24c attached to the. The link rod 24b connects the steering plate 24a and the bearing portion of the caster wheel 23a to tilt the caster wheel 23a in the same direction as the traction member 25. The link rod 24c connects the bearing portion of the steering plate 24b and the caster wheel 23b. By connecting, the caster wheel 23b is tilted in the direction opposite to that of the traction member 25.

  Reference numeral 26 denotes a connecting portion provided on the other end 21a of the carriage 21. By connecting the pulling member 25 of the next carriage 21 to the connecting portion 26, a plurality of carriages 21 can be conveyed in a connected state. Is possible. At this time, since the caster wheels 23 change their directions in accordance with the direction of the traction member 25, each carriage 21 can turn in a small turn without the difference between the inner and outer wheels of the traveling locus of the front and rear wheels during traveling. It is transported smoothly. And since the structure of the steering mechanism 24 is a simple structure consisting of the steering plate 24a and the link rods 24b and 24c, it is easy to assemble and has high robustness. In addition, even if the cart 21 rotates the caster wheels 23 in the horizontal direction, the support points by the caster wheels 23 only move in parallel by the offset of the caster wheels 23. It can maintain high stability and enables safe transport of luggage.

Reference numeral 27 denotes a hand handle used for manually pushing the carriage 21. That is, the user can push the cart 21 by hand by using the hand handle 27. When the hand is pushed, the traction member 25 is tilted about the horizontal rotation shaft 25o and folded to the upper position indicated by a two-dot chain line in FIG. 5 so as not to disturb the user. it can.
Utility Model Registration No. 3037640 JP-A-10-203401

  However, since the four caster wheels 23 are connected to each other even when the cart 21 having the above-described configuration is pushed using a hand push handle, the caster wheels 23 have no degree of freedom, and therefore, the operability is improved. Was bad. In addition, the folded traction member 25 may also be tilted somewhat to the left and right, which changes the direction of each caster wheel 23, and therefore may not be able to transport in the intended direction.

  On the other hand, in Patent Document 2, a slider side having a long hole facing diagonally forward inward at a certain angle with respect to the straight traveling direction is projected on the rotating shaft of the front wheel in a state where the front wheel faces the straight traveling direction. And has a tuning shaft that is loosely connected to the long hole and connects the left and right slider pieces, and the tuning shaft is connected to a steering lever that is pivotally supported at the center position between the front wheels. A front wheel steering mechanism having a complicated configuration formed by engagement and a rotation shaft of a rear wheel connected to the front wheel steering mechanism by a series of anti-back mechanisms including complicated interlocking links and slide links are provided. A front and rear wheel steering mechanism is shown. In this series of steering mechanisms, the slider piece is formed as a latching body that can be separated from the rotating shaft of the front wheel, and the latching body and the rotating shaft of the front wheel are locked by operating the steering switching mechanism. And the front wheel is shown to be rotatable.

  However, the structure of the steering mechanism as in Patent Document 2 is extremely complicated, and it is difficult to assemble by itself. In addition, if a steering switching mechanism for switching when pushed by hand is incorporated into this steering mechanism, the configuration must be further complicated and the assembling work is extremely difficult. Therefore, a great deal of time and labor is required for the assembling work. Not only is it necessary, there is a problem of inducing assembly errors. In addition, as the combination of the members becomes more complicated, each member has to be made smaller, so that there is a problem in its robustness, which causes a failure under severe use conditions.

  The present invention has been made in consideration of the above-mentioned matters, and the purpose of the present invention is to simplify the configuration while linking the direction of each caster wheel at the time of towing, while improving the short turn, while being simple in structure. It is an object of the present invention to provide a rugged truck that can be easily switched so that a caster wheel at the front in the traveling direction is fixed in the straight traveling direction and the caster wheel at the rear in the traveling direction is rotatable in the horizontal direction.

  In order to achieve the above object, the cart of the present invention comprises a platform on which a load is mounted, and casters provided so that the horizontal direction can be freely changed at each of one end side and the other end of the other end of the platform. A wheel, a traction member attached to the one end side of the table so as to be tiltable in the left-right direction, and pulling the table; a first steering mechanism for directing the direction of the caster wheel on one end side in the same direction as the tilting direction of the traction member; A second steering mechanism that directs the direction of the other end of the caster wheel in a direction opposite to the tilting direction of the traction member, and a hand handle that is attached to one end of the base and configured to be able to manually push the base. In addition, a fitting portion is provided in the first steering mechanism, and in the hand-pressed state, the direction of the caster wheel on one end side can be changed regardless of the tilting direction of the traction member by disconnecting the fitting of the fitting portion. Yo While configuring, in pushed state is characterized in that a fixing portion to be fixed the orientation of the other end of the caster wheels in the straight direction (claim 1).

  A second steering mechanism is configured to be rotatable in a horizontal direction around a rotation shaft provided in the vertical direction, and a steering plate having the traction member attached to one end thereof, and the other end connected to the steering plate. A pair of link rods that respectively steer the directions of the left and right caster wheels, the traction member has a width in the left-right direction, and a base end portion thereof is provided horizontally on one end side of the steering plate Provided so that it can tilt up and down around the rotation axis, and in the towing state, the free end of the towing member is positioned at the lower position and pulled to adjust the horizontal direction of the steering plate to the towing direction In addition, the first steering mechanism is configured so that the steering plate can be positioned in the straight direction by fixing the free end portion of the traction member to the fixed portion in the state of being pushed in the hand-pressed state. At one end of the base An arm that is slidably held in the right direction and is provided to be rotatable around a rotation axis in the longitudinal direction around the holding portion, and the traction member or the second steering attached to a central portion of the arm. A lever that slides the arm to the left and right according to the tilting of the pulling member by engaging with one end of the mechanism, and the lever that rotates the arm according to the tilting of the pulling member; Consists of a notch formed in the disk plate attached to the bearing part of the caster wheel on one end side, and a pin attached to both the left and right end parts of the arm and fitted into or removed from the notch as the arm rotates. (Claim 2).

  When the free end portion of the pulling member is in the lower position, the lever rotates at the position where the arm rotates by its own weight to form a rotational force for fitting the fitting portion, and When the free end portion of the traction member is positioned at the upper position, the lever may be provided at a position where the arm rotates when the lever contacts the traction member to disengage the fitting portion. .

  In the cart according to claim 1, the first steering mechanism that directs the direction of the caster wheel on one end side in the same direction as the tilt direction of the traction member, and the direction of the caster wheel on the other end side as the tilt direction of the traction member Since the second steering mechanism that is directed in the opposite direction is provided, when the carriage is towed, the fixing of the direction of the caster wheel on the other end side by the fixing portion is released, and the fitting portion is fitted. As a result, the caster wheels of the carriage are directed to the direction corresponding to the direction of the traction member by the action of the first and second steering mechanisms, respectively, so that the carriage eliminates the difference between the inner and outer wheels of the traveling locus of the front wheels and the rear wheels. Can be turned around. In addition, when manually pushing the carriage, the fitting of the fitting portion provided in the first steering mechanism is disconnected so that the direction of the caster wheel on one end can be changed regardless of the tilting direction of the traction member and fixed. The direction of the caster wheel on the other end side can be fixed in the straight traveling direction by the portion.

  In other words, in order to switch the cart to the manually pushed state, the direction of the caster wheel on one end side can be freely rotated and the direction of the caster wheel on the other end side can be fixed in the straight direction. However, since the operations for the caster wheel on one end side and the caster wheel on the other end side are completely different at this time, in the cart of the present invention, the first steering mechanism for controlling the direction of the caster wheel on the one end side, and the other end side By separately providing the second steering mechanism for controlling the direction of the caster wheels, the switching mechanism between the hand-pressed state and the traction state can be made simple. And the simpler the structure of each member, the easier it is to assemble, and not only can the manufacturing cost be reduced, but each member can be made larger, thus improving the robustness and reliability of the carriage. To do.

  A second steering mechanism is configured to be rotatable in a horizontal direction around a rotation shaft provided in the vertical direction, and a steering plate having the traction member attached to one end thereof, and the other end connected to the steering plate. A pair of link rods that respectively steer the directions of the left and right caster wheels, the traction member has a width in the left-right direction, and a base end portion thereof is provided horizontally on one end side of the steering plate Provided so that it can tilt up and down around the rotation axis, and in the towing state, the free end portion of the towing member is positioned at the lower position and pulled to adjust the horizontal direction of the steering plate to the towing direction In addition, the first steering mechanism is configured so that the steering plate can be positioned in the straight direction by fixing the free end portion of the traction member to the fixed portion in the state of being pushed in the hand-pressed state. At one end of the base An arm that is slidably held in the right direction and is provided to be rotatable around a rotation axis in the longitudinal direction around the holding portion, and the traction member or the second steering attached to a central portion of the arm. And a lever that slides the arm to the left and right according to the tilting of the pulling member by engaging with one end side of the mechanism, and the lever that rotates the arm according to the tilting of the pulling member. Consists of a notch formed in a disk plate attached to the bearing part of the caster wheel on one end side, and a pin attached to the left and right end parts of the arm and fitted or removed from the notch as the arm rotates. In this case (Claim 2), the configuration of each member can be simplified as much as possible, and the traction state and the manual push state can be switched only by the vertical position of the free end portion of the traction member.

  In other words, the second steering mechanism including the steering plate and the pair of link rods adjusts the direction of the caster wheel on the other end side connected by the link rod in accordance with the direction of the steering plate that pivotally supports the towing member. Therefore, it is possible to form a steering mechanism having a very simple configuration that requires a minimum number of connecting portions. Therefore, it is possible to reduce the manufacturing cost by reducing the number of parts that make up the carriage, and to make the assembly and maintenance easy and to have excellent robustness. It should be noted that the positional relationship between the connection point of the steering plate and the link rod with respect to the central axis of rotation of the steering plate in the horizontal direction is the relationship between the connection point of the link rod with respect to the central axis of rotation of the caster wheel in the other direction. When the positional relationship and the positional relationship to be a target are almost the same, the direction of the steering plate and the direction of the caster wheel on the other end side can be reversed.

  Further, the traction member is provided with a base end portion that can be tilted up and down around a rotation shaft provided in the horizontal direction on one end side of the steering plate, and the traction member has a shape having a width in the left-right direction. By fixing the free end portion of the traction member to the fixing portion in a state where the free end portion is positioned at the upper position, the horizontal direction of the traction member can be reliably fixed. Further, by releasing the fixation by the fixing portion, the free end portion of the traction member is positioned at the lower position, and by pulling this, the horizontal direction of the steering plate can be adjusted to the traction direction. The direction of the caster wheel can be opposite to the direction of pulling by the pulling member.

  In addition, the first steering mechanism consisting of an arm, a lever, and a fitting part (a disk plate having a pin and a notch) has a very simple structure, but the arm slides left and right in accordance with the direction of the traction member. When the free end portion of the traction member is positioned at the lower position, the lever is fitted into the notch, and this fitting portion controls the direction of the caster wheel on one end side to match the direction of the traction member. It becomes possible. Since the configuration of the first steering mechanism is simple, the manufacturing cost can be reduced, the assembly is easy and the maintenance is easy, and the number of parts is small, so that each member is sufficiently large to have sufficient robustness. The reliability of the cart can be improved.

  When the free end portion of the pulling member is in the lower position, the lever rotates at the position where the arm rotates by its own weight to form a rotational force for fitting the fitting portion, and When the free end portion of the traction member is positioned at the upper position, the lever is brought into contact with the traction member so that the arm rotates to disengage the fitting portion (Claim 3). Can fit and disengage the fitting portion without difficulty using the weight of the lever.

  That is, when the user tilts the pulling member up and down and positions the free end portion at the lower position, a rotational force for fitting the fitting portion to the arm is generated by the weight of the lever. However, if the left and right caster wheels on one end are not oriented in the same direction as the traction member, the pin is in contact with the outer periphery of the disc plate and the pin fits into the notch formed in the disc plate. Without this, the left and right caster wheels on one end side are rotatable. When starting towing using the towing member, the direction of the left and right caster wheels on one end naturally matches the direction of the towing member, and the positions of the notches and pins provided in the left and right disc plates are When matched, the arm is rotated by the weight of the lever, and a fitting part consisting of a pin and a notch is fitted. Thereafter, the method of the left and right caster wheels on one end side is controlled in accordance with the direction of the traction member. .

  On the other hand, when the user tilts the traction member up and down and places the free end portion at the upper position, the lever hits the traction member and the arm rotates against the weight of the lever, so the pin and the notch are formed. The fitting of the fitting portion is quickly released, and the left and right caster wheels on one end side are rotatable in the horizontal direction. Since the complicated operation described above can be realized by a very simple configuration using the lever's own weight, a simple and clear operation can be performed without using any complicated member such as an elastic body or a guide body.

  1-4 is a figure which shows the structure of the trolley | bogie 1 of this invention, FIG. 1 is a side view, FIG. 2 is the figure seen from the one end side of the trolley | bogie, FIG. 3 is a bottom view, FIG. It is a figure explaining operation | movement.

  2 is a caster wheel, 3 is a caster wheel provided at each of the left and right ends of the one end side 1a and the other end side 1b of the carriage 1, and 4 is attached to the one end side 1a of the carriage 1 so as to be tiltable in the left-right direction. A traction member 5 that pulls the platform is a first steering mechanism that directs the direction of a caster wheel 3 (hereinafter also referred to as a caster wheel 3a) on one end side 1a to a tilting direction of the traction member 4, and 6 is a first steering mechanism. A second steering mechanism 7 for attaching the caster wheel 3 (hereinafter also referred to as the caster wheel 3b) to the direction opposite to the tilting direction of the traction member 4, and 7 is attached to one end side 1a of the carriage 1 and pushes the carriage 1 manually. A hand handle configured to be able to perform, 8 is a fitting portion provided in the steering mechanism 5, and 9 is a fixing portion configured to fix the tilting of the pulling member 4 in the left-right direction, for example. J is a connecting portion for connecting another cart to the cart 1.

  Each of the caster wheels 3 has bearing portions 3c and 3d configured to be rotatable so that the horizontal direction can be freely changed around a center point 3o by a bearing or the like, for example. (Hereinafter, this change in direction is called a swing, and that direction is also called a swing position.)

  The pulling member 4 has a rod body curved in a substantially U shape so as to have a predetermined width W in the lateral direction, and its base end portion 4a is a rotation provided in the horizontal direction on one end side of the steering mechanism 5. It is attached so as to be rotatable about a shaft 4o. And it can be tilted up and down around this rotating shaft 4o. The free end portion 4b of the pulling member 4 is provided with a pulling engagement portion 4c. Further, 4d is a stopper provided so that the traction member 4 maintains a substantially horizontal rotational position when the traction member 4 is positioned at the lower position as shown by a solid line in FIG.

  The steering mechanism 5 is slidable in the left-right direction A (shown in FIGS. 2 and 3) by passing through a ring-shaped holding portion 10 attached at least one to the left and right on one end side 1a of the carriage 1. As shown by an arrow B in FIG. 1, the arm 11 is rotatably provided around the holding portion 10 and is attached to the central portion of the arm 11 and engages with the pulling member 4. By doing so, the arm 11 is slid left and right as the traction member 4 tilts to the left and right as indicated by the arrow A, and the arm 12 is rotated in the direction indicated by the arrow B according to the vertical tilt of the traction member 4. And a generally disc-shaped plate (disk plate) 13 attached to the bearing portion 3c of the caster wheel 3a in order to convert the left-right sliding of the arm 11 into tilting of the caster wheel 3a, and a traction portion When the free end of the 4 is at the bottom position and a fitting portion 8 for rotating the caster wheel 3a in the horizontal direction in accordance with the transverse sliding of the arm 11.

  In this example, since the distance from the rotating shaft 5o to the arm 11 is longer than the distance from the center point 3o to the fitting portion 8, the caster wheel 3a with respect to the right and left tilt angles (traction angle) of the traction member 4 The swing angle is set to be large, but can be adjusted according to the positional relationship between the rotating shaft 5o and the arm 11 and the size of the disk plate 13.

  The disk plate 13 is formed with a hole that can be fitted into the bearing portion 3c at a position where the center is aligned with the center point 3o of the caster wheel 3a, and the bearing portion 3c is fitted in the hole. Therefore, it is configured to be attached by welding or the like.

  The steering mechanism 6 is inserted into a frame body 14 attached to the lower part of one end side 1a of the carriage 1, and is configured to be rotatable in a horizontal direction around a rotation shaft 5o provided in a vertical direction. A steering plate 15 to which the traction member 4 is attached, a pair of link rods 16 each having one end connected to the left and right connecting portions 15a on the other end of the steering plate 15, and the other end of the link rod 16 The steering plate 17 is connected to the connecting portion 16a and attached to the bearing portion 3d of the caster wheel 3b.

  The steering plate 17 has an uneven portion so as to follow the shape of the bearing portion 3c of the caster wheel 3b, and can be fixed by welding or the like along the bearing portion 3c. The link bar 16a is of a turn buckle type that can be adjusted in length, and is provided with an adjuster 16b for correcting distortion caused by a subtle difference in the attachment position of the steering plate 17 by adjusting the length. Furthermore, the adjustment of the tilt direction of the caster wheel 3b with respect to the tilt direction of the steering plate 15 is performed by adjusting the position of the connecting portion 15a, for example.

  In this example, the pair of link rods 16 are arranged so as to intersect with each other, and the position of the connecting portion 15a with respect to the rotating shaft 5o is opposite to the position of the connecting portion 16a with respect to the center point 3o. The swinging direction of the plate 15 and the caster wheel 3b is opposite. Further, since the distance from the rotation shaft 5o to the connecting portion 15a is longer than the distance from the center point 3o to the connecting portion 16a, the angle of the caster wheel 3b swinging is larger than the tilting angle (traction angle) of the steering plate 15. Is set to be larger.

  The hand handle 7 is a rod body that is disposed at one end side 1a of the carriage 1 so as to be easily operated by an operator, for example, with a height of about 1 m from the ground surface and slightly protruding to the one end side 1a. It has a pair of pillars 7a and 7b provided in the section. In addition, an angle 18 is provided between the pillars 7a and 7b so as to pass this, and the pulling member 4 is applied to the angle 18 so that the pulling member 4 can be prevented from turning left and right. Yes.

  Further, 19a is a guide body of the pulling member 4 attached to the angle 18, and 19b is a fixing bracket for fixing the state where the pulling member 4 is in contact with the angle 18. In other words, the fixture 9 comprises an angle 18, a guide body 19a, and a fixture 19b, and the caster wheel is prevented by preventing its left and right tilting in a state where the free end portion 4b of the traction member 4 is fixed at the upper position. The direction of 3b can be fixed in the straight direction.

  The fitting portion 8 includes a pin 11a attached to both left and right ends of the arm 11, and a notch 13a formed in the disk plate 13 so that the pin 11a can be fitted therein. When the pin 11a is engaged, the caster wheel 3a is swung using the left and right sliding of the arm 11.

  The lever 12 forms a pair of curved portions 12a by a rod-shaped member curved in a substantially U shape when viewed from the side surface shown in FIG. 1, and sandwiches the traction member 4 by the pair of curved portions 12a. As shown in FIG. That is, the arm 11 is configured to slide in the left-right direction A in accordance with the tilting of the pulling member 4 in the left-right direction A.

  In addition, since one end of the lever 12 at a position deviated from the center of gravity line 12o (shown in the enlarged view of the main part) of the lever 12 in a state where the pulling member 4 is raised is fixed to the arm 11, the weight of the lever 12 is reduced. In FIG. 1, the torque acts in the counterclockwise direction on the arm 11. Furthermore, 12b is a rod-shaped contact portion provided so as to pass between the pair of curved portions 12a, and when the traction member 4 is stood up to perform manual pushing, the contact portion 12b hits the traction member 4 so that the arm 11 is moved. It is configured to rotate clockwise.

  The shape of the lever 12 is not limited to that described above. For example, when the curved portion 12a is configured to pass through a long hole provided in the longitudinal direction of the traction member 4, it is not necessary to provide a pair of curved portions 12a, and the contact portion 12b in that case is provided on the curved portion 12a. What is necessary is just to provide so that it may cross | intersect. Further, the position where the contact portion 12b is formed is not limited to the curved portion 12a, and may be formed closer to the arm 11, and the shape is not limited to the rod shape.

  Further, the lever 12 does not need to transmit the tilting position of the pulling member 4 in the left-right direction to the arm 11 by contacting the pulling member 4. That is, the lever 12 may transmit the tilting position of the traction member 4 in the left-right direction to the arm 11 by engaging with the first steering mechanism 5 (particularly the steering plate 15).

  The disc plate 13 and the steering plate 17 are attached to the existing caster wheels 3a and 3b so that the swing position can be steered. The holding portion 10, the frame body 14, and the fixture 9 These are configured to be attachable to the main body of the carriage 1. Therefore, by attaching the cart 1 of this example to the existing cart 1, it is possible to make the cart 1 capable of appropriately steering the swing positions of the four caster wheels 3a and 3b during towing. However, the present invention is not limited to this point, and portions corresponding to the disk plate 13 and the steering plate 17 may be formed in the bearing portions 3c and 3d of the caster wheels 3a and 3b.

  In the cart 1 having the above-described configuration, the four caster wheels 3 a and 3 b are horizontally connected to the traction member 4 in a state where the traction member 4 is tilted as shown by a solid line in FIG. The caster wheel 3a on the one end side 1a is in a state in which it can be tilted in accordance with the tilting position of the direction and the traction member 4 is erected (the free end portion 4b is positioned at the upper position) as shown by the phantom line in FIG. It becomes rotatable in the horizontal direction, and the caster wheel 3b on the other end side 1b is fixed in the straight traveling direction. Therefore, the operation of each unit at the time of switching between the two states will be described below.

  First, when the user tilts the pulling member 4, the pulling member 4 is changed from a virtual line state to a solid line state in FIG. 1, so that the contact portion 12 b of the lever 12 does not contact the pulling member 4. For this reason, the weight of the lever 12 acts on the arm 11 as the rotational torque in the counterclockwise direction in FIG. However, when the caster wheel 3a on the one end side 1a does not match the pulling direction of the pulling member 4, the notch 13a of the disk plate 13 shown in FIGS. 3 and 4 does not match the position of the pin 11a. By abutting the outer periphery of the arm 13, the rotation of the arm 11 is prevented. On the other hand, the pulling member 4 is tilted until the stopper 4d comes into contact with the steering plate 15, and the lever 12 does not prevent the tilting of the pulling member 4 upward, so that the pulling member 4 can be tilted easily.

  In this state, when the carriage 1 is pulled for a while, the caster wheel 3a is rotated in the horizontal direction in accordance with the pulling direction (this is because the rotation axis of the caster wheel 3a is offset t from the horizontal rotation center point 3o. (Because it is formed at a shifted position). Therefore, the positions of the notch 13a and the pin 11a are matched, the arm 11 is further rotated counterclockwise in FIG. 1, and the pin 11a is fitted into the notch 13a. 3 and 4 show the fitting state of these fitting portions 8 (11a, 13a).

  By configuring as in this example, when the carriage 1 is switched to the towing state, the steering mechanism 5 can be operated regardless of the direction of the caster wheel 3a that has been rotatable in the horizontal direction until then. No excessive force is applied to any of the constituent parts 10 to 13. Further, since the steering mechanism 5 that controls the direction of the caster wheel 3a and the steering mechanism 6 that controls the direction of the caster wheel 3b are separated, the configuration of each of the parts 10 to 13 is extremely simple, and each component is Since it can be formed large, it is excellent in robustness and easy to maintain.

  As shown in FIGS. 3 and 4, in a state where the traction member 4 is tilted, the traction member 4 is tiltable in the left-right direction around the rotation shaft 5 o of the steering plate 15. Then, as the traction member 4 tilts in the left-right direction A, the lever 12 contacts the traction member 4 and moves in the left-right direction A, and the arm 11 slides in the left-right direction A. When the fitting portion 8 is fitted, the disc plate 13 tilts in the same direction as the traction member 4 via the fitting portion 8, and the caster wheel 3a tilts in the same direction as shown in FIG. To do. That is, this is the operation of the first steering mechanism 5.

  Further, the steering plate 15 is rotated in the horizontal direction in accordance with the pulling direction of the pulling member 4, and the link rod 16 is moved by the tilting of the steering plate 15. As shown in FIG. Tilts in the direction opposite to the tilting direction of the steering plate 15. That is, this is the operation of the second steering mechanism 6.

  Therefore, when the user tilts the traction member 4, the carriage 1 is switched to the traction state, and the directions of the four caster wheels 3 a and 3 b can be controlled in accordance with the tilting direction of the traction member 4. You can turn around. In the traction state, the one end side 1a is forward.

  Next, when the user raises the pulling member 4, as shown in FIG. 2, the pulling member 4 is fixed by the fixing bracket 19b while being in contact with the central portion of the angle 18 while being guided by the guide body 19a. As a result, the fixing portion 9 is firmly fixed. Here, since the traction member 4 is provided with a predetermined width W in the left-right direction A, the position of the traction member 4 is fixed at least at two points Ha and Hb with respect to the angle 18. The fixed state due to can be stabilized.

  Further, the pulling member 4 is rotatable about a rotating shaft 4o provided in the horizontal direction on one end side of the steering plate 15, and can only tilt in the vertical direction with respect to the steering plate 15 about the rotating shaft 4o. Therefore, by fixing the traction member 4 to the fixture 9, it is possible to reliably stop the tilting of the steering plate 15 (that is, the second steering mechanism 6) in the left-right direction. And the direction of the caster wheel 3b of the other end side 1b can be fixed to the straight traveling direction shown in FIG.

  On the other hand, when the pulling member 4 is erected, the contact portion 12b of the lever 12 comes into contact with the pulling member 4, so that the lever 12 rotates in the clockwise direction in FIG. 1, and accordingly, the arm 11 and the pin 11a are also turned clockwise. It turns around and becomes the state shown by the imaginary line. At this time, since the engagement between the pin 11a and the notch 13a is completely released, the fitting by the fitting portion 8 is cut off, and the direction of the caster wheel 3a on the one end side 1a is rotatable in the horizontal direction.

  Therefore, when the user raises the pulling member 4, the carriage 1 is switched to the hand-pressed state, the caster wheel 3a is rotatable, and the caster wheel 3b is fixed in the straight traveling direction. Can be operated at the same interval as a normal handcart. In the hand-pressed state, the other end 1b is the front.

  Since the switching between the hand-pressed state and the traction state is performed by the vertical tilt of the traction member 4, the user can switch the hand-pressed state and the traction state very easily by raising or lowering the traction member 4. It is easy to operate. Moreover, since the fixing part 9 for fixing the direction of the caster wheel 3b in the straight traveling direction is also at the user's hand, the user can perceive the state of the carriage 1 sensibly, which is extremely practical.

  Further, since the rotation shafts of the caster wheels 3a and 3b are slightly shifted from the horizontal rotation center point 3o by an offset t (see FIGS. 1 and 3), the caster wheels 3a and 3b. Even if the swings, the weight balance is not greatly lost, and stable conveyance can be performed.

It is the side view which looked at the Example of the cart of the present invention from the left-right direction. It is the side view which looked at the said cart from one end side. It is a bottom view in the straight drive state of the cart. It is a bottom view in the state where the cart was swung. It is a side view which shows the whole structure of the conventional trolley | bogie. It is a bottom view of the cart.

Explanation of symbols

1 cart 1a one end side 1b other end side 2 units 3 caster wheels 3a one end caster wheels 3b other end caster wheels 4 pulling member 4a base end 4b free end 4o rotating shaft 5 first steering mechanism 5o rotating shaft 6 Second steering mechanism 7 Hand handle 8 Fitting portion 9 Fixing portion 10 Holding portion 11 Arm 11a Pin 12 Lever 13 Disc plate 13a Notch 15 Steering plate 16 Link rod A Left-right direction W Width

Claims (3)

A platform for loading the load;
Caster wheels provided so that the horizontal direction can be freely changed at the left and right ends of the one end side and the other end side of the base,
A pulling member attached to the one end side of the table so as to be tiltable in the left-right direction and pulling the table;
A first steering mechanism for directing the direction of the caster wheel on one end side in the same direction as the tilting direction of the traction member;
A second steering mechanism for directing the direction of the caster wheel on the other end in the direction opposite to the tilting direction of the traction member;
A push handle attached to one end of the stand and configured to be able to push the stand manually; and
The first steering mechanism is provided with a fitting portion, and is configured so that the direction of the caster wheel on one end side can be changed regardless of the tilting direction of the traction member by separating the fitting of the fitting portion in the manually pushed state. on the other hand,
A cart provided with a fixing portion capable of fixing the direction of a caster wheel on the other end side in a straight traveling direction in a manually pushed state. A second steering mechanism is configured to be rotatable in a horizontal direction around a rotation shaft provided in the vertical direction, and a steering plate having the traction member attached to one end thereof, and the other end connected to the steering plate. A pair of link rods that respectively steer the directions of the left and right caster wheels,
The traction member has a shape having a width in the left-right direction, and a base end portion thereof is provided so as to be tiltable up and down around a rotation shaft provided in a horizontal direction on one end side of the steering plate,
In the towing state, the free end portion of the towing member is positioned at the lower position and is towed so that the horizontal direction of the steering plate can be adjusted to the towing direction, and
In the hand-pressed state, the free end portion of the traction member is positioned at the upper position and is fixed to the fixing portion so that the steering plate can be positioned in the straight direction.
An arm that is slidably held in the left-right direction on one end side of the base and is provided so as to be rotatable about a rotation axis in the longitudinal direction around the holding portion;
The arm is attached to the central portion of the arm and engaged with one end of the pulling member or the second steering mechanism to slide the arm left and right in accordance with the tilting of the pulling member. And a lever for rotating the arm together,
The fitting part is attached to the notch formed on the disk plate attached to the bearing part of the caster wheel on one end side, and attached to both the left and right end parts of the arm, and is fitted into or removed from the notch as the arm rotates. The trolley | bogie of Claim 1 which consists of a pin. The lever,
When the free end portion of the pulling member is in the lower position, the arm is rotated by its own weight to form a rotational force for fitting the fitting portion, and
3. The carriage according to claim 2, wherein when the free end portion of the traction member is positioned at the upper position, the carriage is provided at a position where the arm rotates when the lever contacts the traction member to disengage the fitting portion. .

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