JP2020006781A - Conveyance wagon - Google Patents

Abstract

To provide a conveyance wagon structured such that wheels can be easily changed suitably for a floor surface area of operation.SOLUTION: A conveyance wagon (1) configured to convey a component W between a first floor surface area A1 and a second floor surface area A2 includes: a wagon body 2 on which the component W is loaded; wheel bodies 3 mounted on an underbody of the wagon body 2; and a changing mechanism 10 configured to change wheels of the wheel bodies 3 to be grounded. The changing mechanism 10 includes: rolling bodies 11 movable upon and rollable on a mount surface M when the wagon body 2 is manually pushed; a power transmission unit 12 allowing first wheels 3A to be grounded when the wheel bodies 3 enter the first floor surface area A1 by rotation of the rolling bodies 11 and allowing second wheels 3B to be grounded when the wheel bodied 3 enter the second floor surface area A2; and a lock unit 13 locking the wheel bodies 3 to respective positions after wheel changing by the power transmission unit 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transport trolley. More specifically, the present invention relates to a transport trolley for transporting components between a first floor area and a second floor area.

  2. Description of the Related Art Conventionally, as a transport trolley used for supplying parts to a work process, there has been known a configuration in which wheels can be switched to a suitable one in accordance with a change in a work floor area (Patent Document 1). ).

JP 2001-239940 A

  The prior art described above has a large-scale configuration in which the wheels are switched by driving the cylinder. The present invention has been conceived to solve the above-described problems, and the problem to be solved by the present invention is to allow the wheels of the transport vehicle to be easily switched to those according to the floor area of the work. Is to do.

  In order to solve the above-described problems, the transport trolley of the present invention employs the following means.

  A first invention is a transport trolley for transporting components between a first floor area and a second floor area. This transport trolley includes a trolley body on which parts are loaded, a wheel body assembled on the undercarriage of the trolley body and rolling on the floor surface by manual pushing of the trolley body, and a wheel to which the wheel body is grounded. A switching mechanism for switching between the floor area and the second floor area. A wheel body rotatably connected to the bogie main body, a first wheel connected to one end of the seesaw arm and used for grounding on the first floor area, and a second wheel connected to the other end of the seesaw arm. A second wheel used for grounding on the second floor area. A switching mechanism that, when pushed by a bogie main body, rides on a convex portion provided at a boundary between the first floor surface region and the second floor surface region and rolls on the convex surface portion; When the rotation is transmitted to the seesaw arm and the seesaw arm enters the first floor area, the first wheel is switched to the first ground contact position where the first wheel is grounded, and when the second wheel enters the second floor area, the second wheel is used. A power transmission unit that switches the seesaw arm switched by the power transmission unit to a first grounding posture and a second grounding posture, and a lock unit. And a release operation unit for releasing the locked state of the seesaw arm by the transmission of rotational power from the power transmission unit accompanying the reverse rotation of the rolling element.

  According to the first aspect, the wheel body rolling on the floor is moved by simply pushing the bogie main body between the first floor area and the second floor area by hand. It is possible to easily switch to one according to the area.

  According to a second aspect, in the first aspect, the following configuration is provided. The seesaw arm has a swinging structure in which the seesaw arm is turned in the hand-moving direction of the bogie main body to be switched between the first contact position and the second contact position. A power transmission unit is connected to the rolling element and is fed out in mutually opposite rotational directions to receive transmission of rotational power in the opposite direction; and two cables whose intermediate parts are rotatably connected to the bogie main body. The swinging link, in which the end of the cable extended is divided into one end and the other end, is connected to the swinging link and the seesaw arm so as to be able to transmit power, and reciprocates in the traveling direction of hand pushing on the bogie body. An operating rod provided so as to be movable. The locking portion has a concave-convex fitting structure provided between the operation rod and the bogie main body, and is elastically fitted to each other at the first grounding posture and the second grounding posture by the movement of the operation rod. An elastic lock structure that locks the movement of the operation rod is also provided.

  According to the second aspect, the mechanism for switching the wheel body to the one corresponding to the floor area of the work by the movement of the transport trolley to lock or unlock the wheel body is a simple configuration using an elastic fitting structure. Can be embodied.

FIG. 2 is a side view illustrating a schematic configuration of the transport vehicle according to the first embodiment. FIG. 2 is a plan view of FIG. 1. It is a side view of a transport trolley. FIG. 4 is a plan view of FIG. 3. It is the side view which expanded and represented the front part of the transport trolley. FIG. 6 is a plan view of FIG. 5. It is the side view showing the state where the grounding posture of the wheel body was changed by the movement of the transportation vehicle. FIG. 8 is a plan view of FIG. 7. It is the side view showing the state where the grounding posture of the wheel body was returned by the reverse movement of the carrier. It is a top view of FIG.

  An embodiment for carrying out the present invention will be described below with reference to the drawings.

<< About the schematic structure of the transport trolley 1 >>
First, the configuration of the transport vehicle 1 according to the first embodiment will be described with reference to FIGS. In the following description, each direction such as front, rear, up, down, left, and right indicates each direction shown in each drawing.

  As shown in FIGS. 1 and 2, the transport trolley 1 of the present embodiment is configured as a trolley for loading parts W constituting an automobile seat and transporting the parts W to an assembly operation process. In the transport cart 1 described above, when the operator pushes the cart main body 2, each wheel body 3 assembled around the undercarriage of the cart main body 2 rolls on the floor F and is pushed and moved. ing. Specifically, the above-described transport trolley 1 transports the component W from the first floor area A1 serving as a foot area to the second floor area A2 serving as a foot prohibited area. . In addition, after the above-described transport trolley 1 transports the component W to the above-described second floor area A2 and completes the work process, the transport cart 1 is again moved from the second floor area A2 to the first floor area A1. To be used for the second transport operation.

  From such a situation, the above-described transport trolley 1 is designed so that the floor surface F is not contaminated by the traffic between the first floor area A1 and the second floor area A2. When the vehicle passes through the first floor area A1 and when the vehicle passes through the second floor area A2, the wheels to be grounded of the respective wheel bodies 3 are switched to ones corresponding to the respective areas. In detail, the switching operation of the wheel to be grounded of each wheel body 3 described above is usually performed only when the operator moves the carriage 1 back and forth between the first floor area A1 and the second floor area A2. It can be easily performed simply by performing the manual pushing operation.

<< Specific configuration of each part of carrier 1 >>
Hereinafter, the specific configuration of each part of the above-described transport trolley 1 will be described in detail. That is, as shown in FIG. 3 to FIG. 6, the transport trolley 1 includes a trolley body 2 on which the parts W are loaded, and a pair of front and rear wheels having a pair of left and right wheel structures assembled around the front and rear undercarriages of the trolley body 2. Each wheel body 3 is provided with a switching mechanism 10 for switching the grounded wheels of the wheel bodies 3 between the first floor area A1 and the second floor area A2.

  The bogie main body 2 is configured such that a plurality of frame members are framed in a three-dimensional lattice shape. A horizontally long rod-shaped handle 2B that can be gripped by an operator and applied with a hand pushing force from the front and rear sides is attached to the upper and lower frame portions of the bogie main body 2 described above.

  A pair of front and rear wheel bodies 3 is a pair of left and right first wheels 3A used for grounding on the first floor area A1, and a pair of left and right wheels used for grounding on the second floor area A2. The vehicle includes a second wheel 3B, and a pair of right and left seesaw arms 3C that collectively support the first wheel 3A and the second wheel 3B on each of the left and right sides. Each of the first wheels 3A described above is connected to a front end of each of the seesaw arms 3C, and each of the second wheels 3B is connected to a rear end of each of the seesaw arms 3C. Each of the first wheels 3A and each of the second wheels 3B described above are each formed of a free caster.

  The above-mentioned pair of right and left seesaw arms 3C are integrally connected to each other via a swing shaft 3Ca extending in the left-right direction. The pair of right and left seesaw arms 3 </ b> C is rotatably connected to the lower frame of the bogie main body 2 by the pivot shaft 3 </ b> C. It is configured so as to be swingable about the driving shaft 3Ca. With the above-described configuration, the pair of front and rear wheel bodies 3 is rearwardly rotated so that the first wheels 3A are brought into contact with the floor surface F as shown in FIG. It is possible to switch between a tilted first grounding posture P1 and a second grounding posture P2 tilted forward so that the second wheels 3B are grounded on the floor F as shown in FIG. It has become.

  The above-described operation of swinging and rotating the pair of front and rear wheel bodies 3 is performed on the operated shaft extending in the left-right direction bridged between the upper portions of the swing shafts 3Ca of the pair of right and left seesaw links of the wheel bodies 3. 3Cb is performed by an operation that is individually pushed and pulled in the front-rear direction by an operation link of the switching mechanism 10 described later. As described above, the operation of swinging and rotating each wheel body 3 is performed by the push-pull operation of the operated shaft 3Cb set in the region above the swing shaft 3Ca which is the center of rotation of these wheel bodies 3. With this configuration, the posture of each wheel body 3 can be switched by a light operating force transmitted from an operation link of a switching mechanism 10 described later.

  As shown in FIGS. 3 to 6, the switching mechanism 10 includes the rolling elements 11 assembled around the front and rear undercarriage of the bogie main body 2 and the rotation of the rolling elements 11 on the front and rear wheel bodies 3 on the front and rear sides. And a lock for individually locking the attitude of each wheel body 3 switched by the power transmission sections 12 to the switched position. And a portion 13.

  Each of the rolling elements 11 described above is connected at a center of the lower frame portion of the bogie main body 2 to be rotatable about an axis extending in the left-right direction. As shown in FIGS. 3 and 5, each of the rolling elements 11 described above has a height higher than that of the first wheel 3 </ b> A and the second wheel 3 </ b> B of each of the wheel bodies 3 that touch the floor F. It is provided at a high position. With the above configuration, when the first wheel 3A or the second wheel 3B of each of the wheel bodies 3 described above is grounded on the floor F and moved, the rolling elements 11 are floated from the floor F and rotate. Not to be.

  However, as shown in FIGS. 7 and 8, each rolling element 11 described above, when the transport vehicle 1 transitions from the first floor area A1 to the second floor area A2, is located at these boundaries. By being moved so as to pass over the provided convex surface portion M, the vehicle rides on the convex surface portion M and is rolled over the convex surface portion M to be turned. Further, as shown in FIGS. 9 and 10, each rolling element 11 described above is also located at the above boundary when the transport trolley 1 is returned from the second floor area A2 to the first floor area A1. By being moved so as to pass over the provided convex surface portion M, the vehicle rides on the convex surface portion M, rolls on the convex surface portion M, and is turned in the opposite direction.

  Specifically, the above-mentioned convex surface portion M has a configuration in which a rack-tooth uneven surface is formed on the upper surface thereof. Each rolling element 11 also has a configuration in which pinion-shaped uneven surfaces are formed on the outer peripheral surface. With the configuration described above, each rolling element 11 rides on the above-described convex portion M and moves on the upper surface thereof, so that the rolling member 11 is rolled without slipping on the convex portion M and turned. Has become. In addition, each rolling element 11 and the convex portion M described above do not necessarily cause rolling by causing the concave and convex surfaces of the rolling members 11 to engage with each other, but generate rolling by a sliding frictional resistance between them. There may be.

  As shown in FIGS. 3 and 5, each power transmission unit 12 is connected to each of the rolling elements 11 described above, and is provided with two cables 12A1 and 12A2 which are fed in mutually opposite rotational directions. As shown in FIG. 6, a swing link 12B extending in the left-right direction is connected to the above-described intermediate frame portion of the bogie main body 2 via a connection shaft 12B1 extending in the height direction so as to be rotatable. An operating rod 12C is connected to the link 12B and the operated shaft 3Cb of the wheel body 3 so as to transmit power.

  The two cables 12A1 and 12A2 fed out from the above-mentioned rolling elements 11 in mutually opposing rotational directions have their pulled-out ends connected to the pulleys 12A3 and 12A4 attached to the bogie main body 2, respectively. It is provided in a state where it is separately connected to one end and the other end of the above-described swing link 12B. With the above configuration, as shown in FIGS. 7 and 8, when each rolling element 11 rides on the above-mentioned convex portion M and rolls in one direction, as shown in FIGS. Is wound individually around each rolling element 11 to generate a traction force for rotating the swing link 12B in one direction (a direction toward the second floor area A2), thereby causing the rotation of the swing link 12B. , The operation rod 12C is pushed and moved in the traveling direction (forward direction) to switch each wheel body 3 from the first grounding posture P1 to the second grounding posture P2.

  Further, as shown in FIGS. 9 and 10, each power transmission unit 12 causes each rolling element 11 to ride on the above-mentioned convex portion M and roll in the other direction (the direction returning to the first floor area A1). When moving, each other cable 12A2 is individually wound around each rolling element 11 to generate a traction force to rotate the swing link 12B in the other direction, and through the rotation of the swing link 12B accompanying the pulling force. By pushing the operating rod 12C in the traveling direction (rearward direction), each wheel body 3 is switched from the second grounding posture P2 to the first grounding posture P1.

  The operating rod 12C has two engaging protrusions 12C1 protruding upward at an intermediate part of a rod shape extending in the front-rear direction, and a connection state in which the above-described swing link 12B is passed between the engaging protrusions 12C1. , The push-pull operation is performed in the front-rear direction with the rotation of the swing link 12B. The above-described operation rod 12 </ b> C is provided as being guided from both left and right sides so as to be pushed and pulled straight in the front-rear direction with respect to the bogie main body 2. The operation rod 12C is connected to the operated shaft 3Cb of the wheel body 3 via a joint 12C2 so as to be rotatable relative to the operated shaft 3Cb. Are connected in such a manner that the relative rotation of the operated shaft 3Cb that rotates at a time is released.

  As shown in FIGS. 3 to 6, each lock portion 13 includes a fixed piece 13A fixed to the intermediate frame portion of the bogie main body 2 and a movable piece 13B fixed to each of the operation rods 12C described above. It is configured. Each of the fixing pieces 13A described above is made of a block-shaped resin member. As shown in FIG. 6, round holes 13A1 are formed at two front and rear positions on the lower surface thereof. Configuration. Each movable piece 13B is formed of a so-called ball plunger, and is attached to each operation rod 12C so as to extend upward.

  Each of the movable pieces 13B described above is set in a state where the ball 13B1 attached to the distal end thereof is elastically pressed against the lower surface of each fixed portion by the biasing force of an internal spring. As shown in FIGS. 7 and 9, each of the lock portions 13 described above moves the ball 13B1 of each movable piece 13B in the front-rear direction by the above-described movement in which the operation rods 12C are individually pushed and pulled in the front-rear direction. Then, these balls 13B1 are elastically fitted into the concave portions 13A1 at positions where they are fitted with the front and rear concave portions 13A1 formed on the lower surface of each fixed piece 13A, or are elastically removed from the concave portions 13A1. Has become.

  When the balls 13B1 of the movable pieces 13B are fitted into the recesses 13A1 in front and behind of the fixed pieces 13A, the pushing and pulling movements of the operation rods 12C in the front-rear direction are locked, and each wheel body 3 is moved. Locking is performed at each of the positions switched between the first grounding posture P1 and the second grounding posture P2. When the balls 13B1 of the movable pieces 13B are fitted in the recesses 13A1 in front and behind the fixed pieces 13A, the rolling elements 11 are pushed around the convex portions M by the manual pushing of the carrier 1. It can be easily removed by applying a large force.

《Summary》
In summary, the transport trolley 1 of the present embodiment has the following configuration. That is, it is the transport trolley (1) for transporting the component (W) between the first floor area (A1) and the second floor area (A2). The transport trolley is mounted on the trolley body (2) on which the parts (W) are loaded, and is mounted around the undercarriage of the trolley body (2), and rolls on the floor (F) by manual pushing of the trolley body (2). The vehicle has a wheel body (3) and a switching mechanism (10) for switching a wheel to be grounded of the wheel body (3) between a first floor area (A1) and a second floor area (A2).

  A wheel body (3) is connected to one end of the seesaw arm (3C) rotatably connected to the bogie body (2), and is grounded on the first floor area (A1). It has a first wheel (3A) and a second wheel (3B) connected to the other end of the seesaw arm (3C) and used for grounding on the second floor area (A2).

  The switching mechanism (10) rides on the convex surface (M) provided at the boundary between the first floor area (A1) and the second floor area (A2) by manual pushing of the bogie main body (2). Rolling element (11) rolling on the convex surface (M) and transmitting the rotation of the rolling element (11) to the seesaw arm (3C) to move the seesaw arm (3C) into the first floor area (A1). In the case, the first wheel (3A) is switched to the first grounding posture (P1) where the second wheel (3B) is grounded when entering the second floor area (A2). And a seesaw arm (3C) switched by the power transmission unit (12) between a first grounding posture (P1) and a second grounding posture (P2). Lock portion (13) for locking to respective positions of A release operation portion for releasing operation by the transmission of the rotational power from the power transmission unit with the reverse rotation of the lock status rolling elements (11) (12) of (3C) and (12C), the.

  With such a configuration, the bogie main body (2) is simply moved by hand between the first floor area (A1) and the second floor area (A2), and the floor ( F) The wheel body (3) rolling on the top can be easily switched to a wheel body corresponding to the floor area of the work.

  Further, the seesaw arm (3C) has a swinging structure in which the seesaw arm (3C) is turned in the direction of hand pushing of the bogie body (2) to be switched between the first grounding posture (P1) and the second grounding posture (P2). A power transmission unit (12) is connected to the rolling element (11) and is fed out in mutually opposing rotational directions to receive transmission of rotational power in opposite directions; and a bogie body (2). ), A swing link (12B) in which an intermediate portion is rotatably connected to the end of the two cables (12A1 and 12A2), and the ends of the two cables (12A1 and 12A2) are separately connected to one end and the other end. An operation rod (12C) is connected to the link (12B) and the seesaw arm (3C) so as to be capable of transmitting power, and is provided on the bogie main body (2) so as to be reciprocally movable in a hand pushing direction.

  The locking portion (13) is provided with an uneven fitting structure (13A1, 13B1) provided between the operation rod (12C) and the bogie main body (2). P1) and the second grounding posture (P2) are elastically locked to each other to elastically fit each other to lock the movement of the operation rod (12C).

  With such a configuration, a mechanism for switching and locking or unlocking the wheel body (3) according to the floor area of the work by the movement of the transport trolley (1) is elastically fitted. It can be embodied as a simple configuration using the combined structure (13A1, 13B1).

<< Other Embodiments >>
As described above, the embodiment of the present invention has been described using one example. However, the present invention can be implemented in various forms other than the above example. For example, the transport trolley of the present invention can be used as a trolley for transporting various types of parts in addition to the constituent parts of an automobile seat. In addition, the first floor area and the second floor area can be applied as various floor areas to be used by switching wheels, in addition to a foot area and a foot prohibited area.

  Further, the first wheel and the second wheel constituting the wheel body may be made of the same type of wheel, but one of them has a larger diameter and / or width than the other. Tires may have different rubber qualities. Further, the convex portion provided at the boundary between the first floor surface region and the second floor surface region may be made of a member such as a rubber mat that can apply a large sliding frictional resistance to a rolling element.

  Further, the fitting structure of the unevenness of the lock portion may be configured such that a convex portion is provided on the operation rod side and a concave portion is provided on the bogie main body side, but a concave portion is provided on the operation rod side and a convex portion is provided on the bogie main body side. A configuration in which a unit is provided may be used. Further, the protrusion may be fitted into the concave portion upwardly, or may be fitted downwardly into the concave portion. In addition, the convex portion may have a convex shape that can be elastically fitted in the concave portion in addition to the ball plunger. The lock structure in which the convex portion and the concave portion are elastically fitted has an elastic structure in which the convex portion is elastically fitted in the concave portion, and an elastic structure in which the concave portion is elastically fitted in the convex portion. You may have.

DESCRIPTION OF SYMBOLS 1 Transport cart 2 Bogie main body 2B Handle 3 Wheel body 3A 1st wheel 3B 2nd wheel 3C Seesaw arm 3Ca Swing axis 3Cb Operated axis 10 Switching mechanism 11 Rolling element 12 Power transmission part 12A1,12A2 Cable 12A3,12A4 Pulley 12B Swing link 12B1 Connecting shaft 12C Operation rod (release operation part)
12C1 Engagement protrusion 12C2 Joint 13 Lock part 13A Fixing piece 13A1 Depression (fitting structure of unevenness)
13B Movable piece 13B1 Ball (fitting structure of unevenness)
F Floor surface A1 First floor area A2 Second floor area P1 First ground contact posture P2 Second ground contact posture M Convex surface part W Parts

Claims (2)

A transport trolley for transporting parts between a first floor area and a second floor area,
A cart body on which the parts are loaded,
A wheel body that is assembled around the undercarriage of the bogie and rolls on the floor by hand pushing the bogie main body;
A switching mechanism for switching a grounded wheel of the wheel body between the first floor area and the second floor area,
A seesaw arm rotatably connected to the bogie main body, a first wheel connected to one end of the seesaw arm and used for grounding on the first floor area, and the other end of the seesaw arm A second wheel connected to the second floor area and used for grounding on the second floor area,
A rolling element configured to ride on a convex portion provided at a boundary between the first floor surface region and the second floor surface region and to roll on the convex surface portion by manual pushing of the bogie main body; Transmitting the rotation of the rolling element to the seesaw arm and, when the seesaw arm enters the first floor area, switching to the first grounding posture in which the first wheel is grounded; A power transmission unit that switches to a second grounding posture in which the second wheel is grounded when entering the surface area; and the seesaw arm switched by the power transmission unit is connected to the first grounding posture and the second grounding posture. A lock portion that locks to each position with the grounding posture, and a release operation portion that releases the locked state of the seesaw arm by the lock portion by transmitting rotational power from the power transmission portion accompanying the reverse rotation of the rolling element. , Having luck Truck. The transport trolley according to claim 1,
The seesaw arm has a swinging structure that is turned in the traveling direction of the hand pushing of the bogie main body to be switched between the first grounding posture and the second grounding posture,
The power transmission unit is connected to the rolling element, is fed out in mutually opposing rotational directions, receives two transmissions of rotational power, and an intermediate part is rotatably connected to the bogie main body. An oscillating link in which the extended ends of the two cables are divided and connected to one end and the other end; and the trolley body is connected to the oscillating link and the seesaw arm so as to be capable of transmitting power. And an operation rod provided so as to be reciprocally movable in a hand pushing traveling direction,
The locking portion is configured such that a concave / convex fitting structure provided between the operation rod and the bogie main body is moved to the respective positions of the first grounding posture and the second grounding posture by movement of the operation rod. And a carrier having an elastic locking structure for elastically fitting each other to lock the movement of the operation rod.

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