JP5370699B2 - Friction-driven cart type conveyor - Google Patents

Abstract

The invention discloses a friction-driving trolley type conveying device, which can be used for the operator of the vehicle assembly line to take the conveying trolley for the vehicle assembly operation. The conveying trolley 1 is constituted by a plurality of serially connected trolley single bodies 2-4 along the walking direction. One of a left side and a right side of the conveying trolley 1 having the trolley single bodies 2-4 under the forwarding state is connected with the periphery of the vertical joint axial central 18b, 19b of the straight line position parallel to the walking direction in a freely bendable manner. The friction driving rod 11 is disposed on each of the trolley bodies single bodies 2-4, and is constituted by a plurality of rod single bodies 12a-12c disposed the straight line position, besides, the rod single bodies 12a-12c can be freely bent around the joint axial center 18b,19b in the horizontal direction.

Description

  The present invention relates to a friction carriage having a conveyance carriage provided with a friction drive load bar provided along the traveling direction, and a friction drive wheel disposed on the traveling path side of the conveyance carriage and pressed against the load bar. The present invention relates to a friction-driven cart type conveying device comprising means.

  For example, as disclosed in Patent Document 1, a plurality of load bar units arranged in series along a running direction are bent horizontally around a vertical joint axis as a friction-driven cart type transport device having the above-described configuration. A load supporting base is supported by a single load bar (specifically, a central load bar) of a friction drive load bar that is freely connected, and both ends of the friction drive load bar in the length direction are supported. A trolley that supports the position of the intermediate joint axis is supported on a guide rail laid along the travel path so that the trolley can travel, and the friction drive wheel of the friction drive means disposed on the travel path side performs the friction. 2. Description of the Related Art There is known a transport device configured to travel the transported object support base along the travel path by frictionally driving a drive load bar. In the transport apparatus described in this Patent Document 1, a transport object support base, a central load bar of a friction drive load bar that supports the transport object support base, and two front and rear supporting the central load bar A trolley is used to form a carriage. However, as shown in Patent Document 2, a friction drive load bar as described in Patent Document 1 is provided on the left and right sides of the carriage equipped with wheels. There is also known a friction-driven trolley-type transfer device configured by attaching a single load bar (specifically, a central load bar).

Japanese Patent Laid-Open No. 7-33009 JP 2003-191839 A

  In the conventionally known friction-driven cart-type transport devices described in Patent Documents 1 and 2, a horizontally-flexible friction drive load bar having a joint axis in the middle is used. Compared to the friction drive system, which is sandwiched between the friction drive wheel of the drive means and the backup roller, it is not necessary to increase the strength of the transport carriage for friction drive, and the travel direction of the transport carriage can be changed using a turntable. Even without turning, it is possible to change the travel direction of the transport carriage by providing a horizontal curve path section in the travel path. However, it is possible to change the travel direction of the transport carriage. The total length of the body is longer than the total length of the object to be transported (for example, the body of an automobile) mounted on the transport carriage, and each transport base is moved when the transport traveling body travels in the closest state adjacent to the front and rear. Since it is necessary to configure the upper transported objects so that they do not buffer each other, if you try to secure the work floor surface parts that protrude before and after the transported objects at both front and rear ends of the transport cart, the total length of the transport cart is reduced. It must be as long as the overall length of the friction drive load bar.

  As a result, a long and heavy integrated transport cart is required, and the cost of the transport cart becomes very high, coupled with the fact that the parts divided for trucking must be assembled on the installation site. . Further, when the friction drive load bar having a joint structure that can be bent in the horizontal direction is frictionally driven along the horizontal curve path portion, the load of the transport carriage protruding in both the front and rear directions from both front and rear ends of the load bar alone attached to the transport carriage. The front and rear ends project greatly outward from the center line where the friction drive load bar in the horizontal curve path section moves while refracting, and the floor area required for the travel path of the transport carriage in the horizontal curve path section is increased. Become very large.

The present invention proposes a friction-driven trolley-type transfer device capable of solving the above-described conventional problems, and the friction-driven trolley-type transfer device according to the present invention according to claim 1. In order to make it easier to understand the relationship with the embodiment described later, the reference numerals used in the description of the embodiment are shown in parentheses and are provided in parallel with the traveling direction so as to be continuous over the entire length of the carriage. A transport carriage (1) having a friction drive load bar (11), and a friction drive wheel (26) disposed on the travel path side of the transport carriage (1) and in pressure contact with the load bar (11) a friction drive of the carriage type conveying apparatus comprising a friction drive means (25) provided with the conveying carriage (1) is constituted by a plurality of carriage units in series in the running direction (2-4), each The carriage alone (2-4) is the direction of travel on the left and right sides of the carriage (1) It is connected horizontally around a vertical joint axis (18b, 19b) located on a parallel straight line so that it can be bent horizontally, and the friction drive load bar (11) is divided for each carriage unit (2-4). Consists of a plurality of load bar units (12a to 12c), and each load bar unit (12a to 12c) is mounted on each cart unit (2 to 4) at a position on the straight line, and is a friction-driven cart type transfer In the device
Each load bar (12a to 12c) of the friction drive load bar (11) is a vertical support shaft (18a, 19a) concentric with the joint axis (18b, 19b) between the carts (2-4). ), The carriages (1-4) of the carriage (1) are connected to the load bars (12a-12c) attached to the carriages (2-4) and the vertical support. It is connected through a shaft (18a, 19a) so that it can be bent horizontally,
The vertical support shafts (18a, 19a) between the individual load bars (12a to 12c) are connected to any one of the front and rear carts (2 to 4) rather than the position between the front and rear adjacent carts (2 to 4). It has a configuration that is arranged at the overlapping position .

When the present invention is carried out, specifically, as described in claim 2 , the friction drive load bar (11) is positioned at the joint axis (18b, 19b) between the both ends and the middle. Each of the guide rollers (16 to 19) is supported on a travel path side (for example, at least a horizontal curve path portion) of the transport carriage (1) by rotatably supporting guide rollers (16 to 19) around vertical axes. A guide rail (24) with which 19) engages can be provided.

Further, as described in claim 3 , the transport cart (1) is composed of three carts (2 to 4) in series, and the central cart (2) has a carrier support platform (9a, 9b). ) And a lift drive means (10) for the transported object support base (9a, 9b), and supported on the transported object support base (9a, 9b) on the front and rear carriages alone (3,4). Work floors (3a, 4a) projecting forward and backward from the front and rear ends of the conveyed object (W) are provided, the lifting drive means (10) is a load bar single unit (2) attached to the central carriage unit (2) ( It can be made to project below the central carriage unit (2) at a position further away from the central part of the carriage than 12b).

According to a fourth aspect of the present invention, a second friction drive member is provided on the side of the transport cart (1) opposite to the side of the side where the friction drive load bar (11) is attached. A load bar (34) is provided, and the second friction drive load bar (34) is arranged so that each carriage unit (1) is arranged in series on a straight line parallel to the traveling direction when the transport carriage (1) is in a straight running posture. It consists of a single load bar (35a-35c) attached separately in 2-4), and in the straight travel path part in the travel path of the transport carriage (1), apart from the friction drive means (25), Second friction drive means (36) acting on the second friction drive load bar (34) can be provided.

Further, as described in claim 5, the conveying carriage (1), said the friction drive for the load bar (11) side portions attached adjacent to the back and forth in the side portion opposite the bogie A connecting means (37a, 37b) capable of connecting the single bodies (2-4) to each other is provided, and at least in front of the horizontal curve path section (31A, 31B) in the traveling path of the transport carriage (1) In addition, an operating means (cam rail 46) for switching the connecting means (37a, 37b) to the disengaged state can be provided. In this case, as described in claim 6 , the connecting means (37a, 37b) has a refractive posture in which the front and rear carts (2-4) swing around the joint axis (18b, 19b). In addition to automatic connection means that automatically switches to the connected state when returning to the straight running posture, an operated portion (cam driven roller 45) for switching from the connected state to the disconnected state is provided, and the transport carriage (1) The automatic connection means (37a, 37b) is operated by operating the operated portion (cam driven roller 45) at least in the transition section from the straight travel route portion to the horizontal curve route portion (31A, 31B) in the travel route. A cam rail (46) for switching the connecting state from the connected state to the disengaged state can be provided as the operating means.

  According to the structure of this invention of Claim 1, the conveyance trolley | bogie used for the assembly line of a motor vehicle, ie, the long conveyance trolley | bogie provided with the work floor surface which protrudes back and forth from the front and back of the mounted vehicle body, is used. Even in this case, since the transport cart can be composed of a plurality of carts in series in the traveling direction, each cart can be kept to a size that can be transported by truck as it is, and each cart can be used alone on site. Are not rigidly connected and integrated into a single transport cart, but each cart is simply connected in a horizontal direction around a vertical joint axis so that it can be bent in a horizontal direction. Even if it exists, it can be implemented relatively inexpensively. In particular, both front and rear carts provided with a work floor projecting forward and backward from both front and rear ends of the transported object supported on the transported object support table before and after the central cart unit provided with the transported object support table. Are connected around the joint axis in a refractive manner to form a transport carriage used in the automobile assembly line, the central carriage alone has the strength necessary to safely support and transport the car body, Since both the front and rear carriages can be configured to be lower in strength than the central carriage alone, it is possible to reduce the weight of the entire transport carriage and thus reduce costs.

  In addition, each cart is connected to the right and left sides so that it can be bent horizontally around the vertical joint axis, so that it can be bent horizontally on the center line passing through the center in the width direction on both sides. Compared to the case where the carriage is turned, the horizontal turning direction of the transport carriage is limited to one side of the left and right, but the carriage adjacent to the front and rear to allow the space bending and the horizontal bending movement between the carriages adjacent to the front and rear. It is not necessary to install between single units, and on the straight traveling path part mainly used for the work line, the floor surface can be abutted over the entire width of the left and right between the single units adjacent to the front and rear. There is no risk of adversely affecting the safety of work on the cart.

  In addition, as a result of the joint axis between the single trucks being arranged on the left and right sides of each single truck, the friction drive load bars that can be bent horizontally around the joint axis are located on the left and right sides of the transport truck. As a result, the friction drive load bar and the friction drive means on the travel path side are disposed on the left and right sides of the travel path of the transport carriage. Compared with the configuration in which the friction drive load bar and the friction drive means on the travel path side are arranged at the center position in the left-right width direction of the transport carriage, the maintenance of the friction drive load bar and the friction drive means is also easier. Become.

Further , according to the configuration of the present invention , the horizontally refracting friction drive load bar itself having a horizontal refracting joint (vertical support shaft) in the middle also serves as a connecting means between the carriages. Assembling of the traveling body for transportation composed of the friction drive load bar and the transportation carriage is facilitated.

Furthermore, it is desirable that each load bar constituting the friction drive load bar is attached to the bottom surface of the left and right sides of each carriage alone. In this case, however, the vertical support between the load bars alone is inevitably required. The position of the shaft enters the inner side from the side of the carriage alone at least half the horizontal width of the load bar alone. As a result, when the vertical support shaft is located between the front and rear adjacent carts (adjacent positions on both front and rear sides of both carts), the transport cart moves to the side where the friction drive load bar is located in the horizontal curve path. When turning horizontally, cut off the corners of the front and rear sides of a single carriage adjacent to the front and rear in a circular arc with a small curvature so that the corners of the front and rear sides of the carriage alone do not interfere with each other. I have to leave. However, according to the configuration of the present invention , it is possible to increase the distance from the vertical support shaft between each load bar unit to the front and rear sides of the cart unit, so that the play allowance between the front and rear sides of the cart unit is not exceeded. Thus, even when the above-described interference is avoided or when the corners on both the front and rear sides of the carriage are cut off, it is only necessary to cut off the arc with a large curvature.

In particular, in the case where the carriage is composed of three carriages in series, and the carrier carriage is provided on the central carriage alone, the central carriage alone becomes longer than the preceding carriage alone. If the load bar of the friction drive load bar attached to the central carriage becomes longer, restrictions on the structure and arrangement of the friction drive means for passing the carriage on the horizontal curve path will increase. In addition, according to the configuration of the present invention , the length of the single load bar attached to the front and rear carts is made longer than the total length of the front and rear carts alone, and the length of the single load bar attached to the central cart is changed to the central cart. By making it shorter than the total length of the single body, the difference in length of each load bar can be suppressed small, which is convenient.

In the configuration of the present invention, the transport carriage is frictionally driven by the friction drive means arranged on the travel path side, but the travel direction of the transport carriage at this time must be regulated by some means. For example, the travel direction of the transport carriage can be regulated by the travel path side guide rail that engages with the wheels of the transport carriage. According to the configuration of claim 2 , the travel of the transport carriage that is driven by friction is performed. The direction can be regulated by the guide roller provided in the friction drive load bar and the guide rail on the travel path side. In other words, it is no longer necessary to lay guide rails that engage with the wheels of the transport carriage on the floor, and the regulation of the direction of travel of the transport carriage in the horizontal curve path is particularly simple, and the implementation of the equipment Is easy and inexpensive. The configuration described in claim 4 need not be implemented over the entire travel route of the transport carriage including the straight travel route portion, and can be implemented only in a specific section, for example, a horizontal curve route portion.

Also, an automobile that requires a work support surface that projects from the front and rear ends of the object to be transported, the lifting and lowering drive means of the object support base, and the front and rear ends of the object to be transported supported on the object support base. In the case of using as a friction-driven carriage type transport device for an assembly line, according to the configuration of claim 3 , a single carriage is provided with a transported object support base and a lifting drive means for the transported object support base. Has the strength necessary to safely support and convey the car body, and the front and rear carriages can be configured with lower strength than the central carriage alone, but also installed in the central carriage alone Since the lifting drive means is provided so as to protrude below the central carriage unit regardless of the friction drive load bar, the lifting drive means must be installed on the central carriage unit. Compared to the middle The lower space of the vehicle alone was effective use, it is possible to lower the floor on height occupied space required for the conveying path.

In the configuration of the present invention, the friction drive load bars are disposed on the left and right side portions of the transport carriage, so that the transport carriage is driven by the friction drive means on the travel path side and travels along the straight travel path section. In the case where the straightness of the transport carriage is secured by the guide rail that engages with the wheels of the transport carriage or the guide rail that engages with the guide roller of the friction drive load bar as described in claim 2. However, a large frictional force in the lateral direction is applied to these guide rails, which causes adverse effects such as shortening the service life of the wheels, guide rollers, guide rails, and the like. However, according to the configuration of the fourth aspect , in the straight traveling path portion, the conveyance carriage can be friction driven via a pair of left and right friction drive load bars disposed on the left and right side portions, respectively. It can be done, and the lateral force on the side of the transporting carriage will not act on the side of the transporting carriage due to the friction drive, so that the transporting carriage can run smoothly and go straight, and the durability of the wheels, guide rollers, guide rails, etc. The risk of shortening the life is also eliminated.

Further, according to the configuration of the fifth aspect , in the straight traveling path portion, a plurality of carts in series in the front and rear can be connected to each other by a connecting means, so that an unrefracted integrated transport cart can be obtained. For example, when it is necessary to provide a passage that crosses the straight travel route, the passage width is set to such an extent that the conveyance carriage can be surely passed through the passage by the friction drive means arranged before and after the passage. By limiting, it is not necessary to provide guide rails or friction drive means for guiding the transport carriage in the passage, and the safety of the passage can be improved. Of course, when the transport carriage reaches the front of the horizontal curve path section, the connecting means is automatically switched to the disengaged state, so that the transport truck is also driven in the horizontal curve path section by friction drive as expected. It can be made.

In addition, when implementing the structure of the said Claim 5 , you may comprise so that each trolley | bogie single_piece | unit may be connected by the said connection means only in the specific area in a linear travel path part, or in the whole area of a linear travel path part. You may comprise so that each trolley | bogie single unit may be connected by the said connection means. In addition, the connecting means can be switched to the disconnected state by the operating means on the travel route side. However, the connecting means switched to the disconnected state can be switched to the connected state again by the operation provided on the traveling route side. It may be performed by means. However, according to the configuration described in claim 6 , for example, the cam rail as the operating means is disposed only in the transition section from the straight traveling route portion to the horizontal curve route portion, and the transition to the horizontal curve route portion is performed. The connecting means of the transport carriage is automatically switched to the disengaged state, and each carriage of the transport carriage is refracted to pass through the horizontal curve path section without any trouble. The connecting means of the transport cart that shifts to the state is automatically connected using a motion in which each cart of the transport cart switches from a bending posture to a straight traveling posture without providing special operating means on the travel path side. It can be restored.

FIG. 1 is a partially cutaway plan view. FIG. 2 is a front view of the travel route side excluding the friction drive means. FIG. 3 is a front view showing the main parts of the friction drive means and the transport carriage. 4A is a plan view of the friction drive load bar, and FIG. 4B is a side view of the friction drive load bar. FIG. 5 is a plan view showing a first stage of the traveling state of the transport carriage on the horizontal curve path portion in the travel path of the transport carriage. FIG. 6 is a plan view showing the second stage. FIG. 7 is a plan view showing the third stage. FIG. 8 is a plan view showing the fourth stage. FIG. 9 is a plan view showing the fifth stage. FIG. 10 is a partially cutaway plan view showing a second embodiment of the present invention. FIG. 11 is a partially cutaway plan view showing a third embodiment of the present invention. FIG. 12 is a side view showing a connected state of the connecting means of the third embodiment. FIG. 13 is a side view showing a detached state of the connecting means of the third embodiment. 14 is a cross-sectional plan view of FIG. FIG. 15 is a plan view showing a first stage of the traveling state of the transport carriage in the operation mode of the third embodiment. FIG. 16 is a plan view showing the second stage. FIG. 17 is a plan view showing the third stage. FIG. 18 is a plan view showing the fourth stage. FIG. 19 is a plan view showing the fifth stage.

  As shown in FIGS. 1 to 4, the transport cart 1 is composed of a central cart unit 2 located at the center of the traveling direction, and a front cart unit 3 and a rear cart unit 4 adjacent to each other. Each bogie unit 2 to 4 has two sets of left and right front and rear sets of free wheels 6 to 8 that roll on a pair of left and right guide rails 5 a and 5 b laid along the travel route. Are provided with a pair of front and rear transferred object support bases 9a and 9b, and an elevating driving means 10 for driving the both transferred object support bases 9a and 9b in parallel.

Since this lifting drive means 10 has various structures, the illustration and description of the structure are omitted. For example, a pantograph link mechanism for supporting the object support bases 9a and 9b so as to be movable up and down in parallel, and the pantograph. It is composed of a fluid pressure cylinder unit that drives the link mechanism up and down, a motor-driven screw-type jack, and a lifting and lowering drive device that can be pushed up and pulled down. In addition, the raising / lowering drive means 10 is provided so that it may protrude below the center carriage single body 2 so that the to-be-conveyed object support bases 9a and 9b can fall to the work floor surface 2a of the center carriage single body 2.

  A transported object (for example, an automobile body) W supported on the transported object support bases 9a and 9b overlaps the front and rear carriage units 3 and 4 from both front and rear ends of the central carriage unit 2 in a plan view. The front and rear both carts 3 and 4 are formed with working floor surfaces 3a and 4a for the front and rear ends of the object W projecting on the front and rear carts 3 and 4, respectively. . Of course, the work floor surfaces 3a, 4a of the front and rear carts 3 and 4 are configured to be flush with the work floor surface 2a of the central cart 2 alone.

  The individual carts 2 to 4 of the transport cart 1 are connected by a friction drive load bar 11 attached to the bottom surface along the left and right sides. The friction drive load bar 11 has an overall length that is substantially the same as the overall length of the transport carriage 1, and is composed of three load bar single bodies 12 a to 12 c that are attached separately to the individual trucks 2 to 4. Yes. The front load bar unit 12 a attached to the front carriage unit 3 has a length longer than the entire length of the front carriage unit 3, and the front carriage unit unit 3 from the bottom front end of the front carriage unit 3. The rear load bar unit 12c attached to the rear carriage unit 4 so as to protrude below the central carriage unit 2 along one side of the rear carriage has a length longer than the total length of the rear carriage unit 4 And a central load bar attached to the central carriage unit 2 so as to protrude from the rear end of the bottom surface of the rear carriage unit 4 to the lower side of the central carriage unit 2 along one side of the rear carriage unit 4. The single body 12b has a length shorter than the entire length of the central bogie single body 2, and the central bogie single body 2 is connected to the bottom surface of the central bogie single body 2 so as to connect the front and rear load bars 12a and 12c. One It is attached along the side.

More specifically, as shown in FIG. 4, each of the load bars 12a to 12c is composed of a bar-shaped member having a square cross-sectional profile. 4 are fixed so that the mounting plates 13 to 15 protrude to the inside, and guide rollers that are rotatable around a vertical axis are provided at the front end of the front load bar unit 12a and the rear end of the rear load bar unit 12c. Bearing members 16a and 17a, which are supported on the lower side, are fixed, and the rear end of the front load bar unit 12a and the front end of the central load bar unit 12b, and the rear end and the rear load of the central load bar unit 12b. the front end of the bar units 12c, its overlap portion with overlap one above the other is a vertical shaft 18a which guide rollers 18, 19 at the lower end is attached horizontally bendable around 19a When the connecting members 20a, 20b and 21a, 21b to be coupled are fixed and the load bar units 12a-12c are in a straight line, the load bar units 12a-12c including the bearing members 16a, 17a and the connection members 20a-21b are included. The left and right side surfaces are configured to form friction drive surfaces 22 a and 22 b that are continuous in a straight line over the entire length of the friction drive load bar 11.

  As a result of the load bar units 12a to 12c of the friction drive load bar 11 having the above-described configuration being attached to the cart units 2 to 4 of the transport carriage 1 as described above via the mounting plates 13 to 15, each cart unit 2 -4 are in a straight running posture in which both front and rear sides are adjacent to each other in series, the entire friction drive load bar 11 is positioned on a straight line parallel to the traveling direction of the transport carriage 1 and each guide roller 16 -19 axes are also located on a straight line parallel to the traveling direction of the transport carriage 1. Each of the carts 2 to 4 is arranged around the axial centers of the vertical support shafts 18a and 19a of the guide rollers 18 and 19 at the positions overlapping the lower sides of the front and rear ends of the central cart 2, that is, the joint axes 18b and 19b. It is connected in a horizontal direction so that it can be bent freely.

  The traveling route of the transport carriage 1 includes a pair of left and right guide rails 5a and 5b described above and a pair of left and right rail members 23a and 23b sandwiching the guide rollers 16 to 19 of the friction drive load bar 11 from both left and right sides. A configured travel direction regulating guide rail 24 is laid. Further, friction driving means 25 is disposed at a required location in the travel route of the transport carriage 1. The friction drive means 25 has a structure in which the friction drive load bar 11 on the transport carriage 1 side is sandwiched from both the left and right sides by a motor-driven friction drive wheel 26 and a backup roller 27. The backup roller 27 is in a fixed position. The friction drive wheel 26 rotatably supported around the vertical support shaft and the motor 26a which rotates around the vertical support shaft can swing horizontally around the vertical support shaft 28. An urging means 30 that urges the movable body 29 in the direction in which the friction drive wheel 26 moves closer to the backup roller 27 is supported by the pivotable movable body 29. As the biasing means 30, a spring, a fluid pressure cylinder unit shown in the figure, or the like is used.

  This type of friction drive means 25 is well known in the art, and is a boost drive section in which each of the transport carriages 1 is driven by the rear transport carriage 1 in the straight travel section in the travel path of the transport carriage 1. In the section where the carriage 1 is provided at the entrance and exit of the boost drive section, and the carriage 1 is traveled at appropriate intervals, the carriage 1 is arranged at an interval slightly shorter than the overall length of the carriage 1, that is, the friction drive load bar 11. Is done. Therefore, in the straight traveling section in the traveling route of the transport carriage 1, the front end (front load bar) of the friction driving load bar 11 is interposed between the friction driving wheel 26 and the backup roller 27 driven by the motor of the friction driving means 25. The transport carriage 1 into which the front end of the single body 12a has entered travels forward by receiving a thrust in the forward direction due to the frictional force between the rotating friction drive wheel 26 and the friction drive surface 22a of the friction drive load bar 11. However, the friction drive load bar 11 and the friction drive wheel 26 are caused by the resistance between the respective free wheels 6 to 8 and the guide rails 5a and 5b located at the inner side of the friction drive load bar 11. The horizontal rotational force about the contact point between the two acts on the transport carriage 1 and the straight traveling performance of the transport carriage 1 is impaired. Each of the guide rollers 16 to 19 at the joint axis position is engaged with a travel direction regulating guide rail 24 laid along the travel direction of the transport carriage 1, so that the transport carriage 1 is in the travel direction. The vehicle travels straight in parallel with the regulating guide rail 24.

  Accordingly, the guide rails 5a and 5b for the universal wheels 6 to 8 of the transport carriage 1 only need to have a flat surface that supports the universal wheels 6 to 8 so as to roll freely. Of course, when the travel direction regulation guide rail 24 for regulating the travel direction of the transport carriage 1 is laid through the guide rollers 16 to 19 of the friction drive load bar 11, the guide rails 5a and 5b are used. Alternatively, each of the free wheels 6 to 8 can be configured to roll on a flat floor surface.

  Next, based on FIGS. 5 to 9, the travel of the transport carriage 1 in the horizontal curve path section 31 provided in the travel path of the transport carriage 1 will be described. The straight travel path 32 is connected to the straight travel path 33 on the lower side perpendicular to the straight travel path 32, and the carriage 1 is connected to the side where the friction drive load bar 11 is located. Is turned in a direction toward the turning center side. Thus, the friction drive means 25A and 25B are disposed on the entrance side and the exit side of the horizontal curve path portion 31. Further, the guide rails 5a and 5b in the horizontal curve path portion 31 are arranged at both ends of the horizontal curve path portion 31 so as to cover the movement trajectory of each of the free wheels 6 to 8 of the transport carriage 1 traveling on the horizontal curve path portion 31. However, instead of the guide rails 5a and 5b, a flat floor plate can be stretched over the horizontal curve path portion 31.

  As shown in FIGS. 5 and 6, the linear travel path section 32 is driven by the friction drive means 25 (or the back drive by the succeeding transport carriage 1) one higher than the friction drive means 25 </ b> A on the entrance side of the horizontal curve path section 31. The carriage 1 that travels toward the horizontal curve path 31 reaches the friction drive means 25A on the entrance side, and is then fed into the horizontal curve path 31 by the friction drive means 25A. The transport carriage 1 reaches a position where the rear end of the friction drive load bar 11, that is, the rear end of the rear load bar single body 12c attached to the rear truck single body 4 is disengaged from the friction drive means 25A. Before, the front end of the friction drive load bar 11 of the transport carriage 1, that is, the front end of the front load bar single body 12a attached to the front carriage single body 3 is the friction drive means on the outlet side of the horizontal curve path section 31. As shown in FIGS. 7 and 8, the transport carriage 1 is switched from the driving state by the friction driving means 25A to the driving state by the friction driving means 25B without interruption, and the friction driving means 25B Then, the front bogie 3 is fed from the horizontal curve path 31 to the lower straight running path 33 in the order of the central bogie 2 and the rear bogie 4. .

  As described above, when the transport carriage 1 travels from the upper straight travel path section 32 to the lower straight travel path section 33 via the horizontal curve path section 31, it is attached to the front bogie 3 alone. Guide rollers 16 and 18 positioned at both front and rear ends of the front load bar unit 12a, guide rollers 18 and 19 positioned at both front and rear ends of the central load bar unit 12b attached to the central cart unit 2 and the rear cart unit 4 Guide rollers 19 and 17 located at both front and rear ends of the rear load bar unit 12c attached to the vehicle move along a travel direction regulating guide rail 24 laid in an arc along the horizontal curve path portion 31. Accordingly, each of the carts 2 to 4 has a central axis (vertical support shaft 18a) between the front load bar unit 12a and the central load bar unit 12b and the middle. A fulcrum joint axis between the load bar units 12b and the rear load bar units 12c (vertical spindle 19a), travels with relatively refracted horizontally in bending direction of the horizontal curve path section 31. Then, as shown in FIG. 9, the rear bogie unit 4 shifts from the horizontal curve path portion 31 to the lower straight travel path portion 33, and each bogie unit 2 to 4 again goes straight in parallel with the straight travel path portion 33. The transport carriage 1 in the posture is sent out to the lower straight travel path section 33 by the friction drive means 25B on the exit side of the horizontal curve path section 31.

  In another embodiment of the present invention shown in FIG. 10, a second friction drive load bar 34 is provided on the side of the transport carriage 1 opposite to the side where the friction drive load bar 11 is located. It has been. The second friction drive load bar 34 includes a front load bar unit 35a attached to the front carriage unit 3 of the transport carriage 1, a center load bar unit 35b attached to the center carriage unit 2, and a rear carriage unit. 4, the length of each load bar single unit 35a to 35c is substantially equal to the total length of each single truck 2 to 4 to be attached, When the single units 2 to 4 are in a straight running posture in series, they are parallel to the friction drive load bar 11 and in series on a straight line, and are connected to each other like the load bar single units 12 a to 12 c of the friction drive load bar 11. No guide rollers corresponding to the guide rollers 16 to 19 are provided.

  In addition to the friction drive means 25 that acts on the friction drive load bar 11 to propel the transport carriage 1, the second traveling path portion of the transport carriage 1 having the second friction drive load bar 34 The second friction drive means 36 that act on the friction drive load bar 34 to propel the transport carriage 1 can be preferably arranged in parallel with the friction drive means 25 in a bilaterally symmetrical position. Since the second friction drive means 36 has a symmetrical structure with the friction drive means 25, the same reference numerals are assigned and description thereof is omitted.

  As described above, in the linear travel path portion of the transport carriage 1 in which the friction drive means 25 and the second friction drive means 36 are arranged in parallel in the left-right symmetric position, the transport carriage 1 has friction drive loads on both left and right sides thereof. Through the bar 11 and the second friction driving load bar 34, the friction driving means 25 and the second friction driving means 36 are simultaneously driven by the driving force, so that the transport carriage 1 is strongly driven. In addition, since the straightness of the transport carriage 1 is ensured, the friction between the guide rollers 16 to 19 of the friction drive load bar 11 and the travel direction regulating guide rail 24 is also reduced. Of course, since each load bar single-piece | unit 35a-35c which comprises the 2nd friction drive load bar 34 is not mutually connected, when this conveyance trolley 1 drive | works the horizontal curve path | route part 31 demonstrated previously, each trolley | bogie is carried out. It does not affect the horizontal relative refraction movement of the simple substance 2-4.

  In another embodiment of the present invention shown in FIGS. 11 to 14, a single carriage 2 adjacent to the front and rear sides of the side of the transport carriage 1 opposite to the side of the friction drive load bar 11. Automatic connecting means 37a and 37b for connecting the four members are provided. The automatic connecting means 37a, 37b includes a hook member 38 that is fixed in position, and an engaging portion 40 that can swing up and down around the horizontal support shaft 39 and that can be engaged with and disengaged from the hook member 38 at the tip. The swing arm 41 and a spring 42 that biases and holds the swing arm 41 in the engagement posture with respect to the hook member 38 are configured.

  In the illustrated example, the hook member 38 is attached to the lower side of the front ends of the lower carts 2 and 4, and the swing arm 41 is attached to the lower side of the rear ends of the upper carts 3 and 2. More specifically, the swing arm 41 is a pair of left and right arm members 41a pivotally supported around the left and right horizontal support shafts 39 with a vertical bearing plate 43 suspended from the single carriage side. , 41b, and the engaging portion 40 is constituted by a roller 40a that is rotatably supported by a left and right horizontal support shaft 44 between the tip portions of the pair of left and right arm members 41a and 41b. A cam driven roller 45 as an operated portion is supported on an end portion extending to one side. The spring 42 includes a tension coil spring that is stretched between a connecting plate 41c that connects the pair of left and right arm members 41a and 41b to each other and a mounting plate 43a on which the bearing plate 43 projects downward. The bearing plate 43 is provided with a stopper portion 43b that contacts the connecting plate 41c in order to receive the swing arm 41 in an engagement posture with respect to the hook member 38.

  The automatic connecting means 37a and 37b having the above-described configuration are such that when the transport carriage 1 is in a straight running posture in which the individual carriages 2 to 4 are in series as shown in FIG. 11, the engagement of the swing arm 41 as shown in FIG. Inside the portion 40 (roller 40a), the check claw portion 38a at the tip of the hook member 38 is in a connected state between the pair of left and right arm members 41a and 41b. At this time, the swing arm 41 is supported by the stopper portion 43b of the bearing plate 43 in a substantially horizontal posture. When the automatic connecting means 37a and 37b are in the connected state in this way, the transport carriage 1 becomes in a state where the refraction movement between the individual carriages 2 to 4 is impossible.

  As shown in FIGS. 13 and 14, the automatic connection means 37a, 37b, which is set in the travel route of the transport carriage 1, is switched to the disengaged state from the connected state. A cam rail 46 is laid to push up the cam follower roller 45 of the swing arm 41 of 37b as the transport carriage 1 travels and to maintain the pushed state over the required path length. Therefore, when the transport carriage 1 travels through the point where the cam rail 46 is laid, the cam follower roller 45 of the swing arm 41 of the automatic connection means 37a, 37b in the connected state rides on the cam rail 46, and the swing arm 41 moves up to the left and right horizontal support shafts 39 against the biasing force of the spring 42, and the engaging portion 40 (roller 40a) at the tip thereof comes from the check claw portion 38a of the hook member 38 of the counterpart truck alone. By separating upward, the automatic coupling means 37a and 37b are switched from the coupled state to the detached state.

  In the detached state of the automatic connection means 37a, 37b, as shown in FIGS. 13 and 14, the front and rear carriage single bodies 3, 2 and 2, 4 connected by the dynamic connection means 37a, 37b can move apart from each other. In this state, the carts 2 to 4 can be refracted. Further, when the cam follower roller 45 of the swing arm 41 of the automatic connecting means 37a, 37b is separated from the cam rail 46 in a state where the front and rear carts 3, 2, and 2, 4 are separated from each other by refraction, The swing arm 41 returns to the original engagement posture by the urging force of the spring 42 at a position away from the hook member 38 of the single carriage. In this state, when the front and rear carriages 3, 2, 2, 4 separated from each other move closer to each other by the refraction movement in the return direction, the engagement of the swinging arm 41 received by the stopper portion 43 b in the horizontal posture. When the roller 40a of the engaging portion 40 rides on and passes through the check claw portion 38a of the hook member 38 of the counterpart truck alone, the joint portion 40 automatically enters the check claw portion 38a of the hook member 38. The automatic coupling means 37a and 37b are automatically returned to the original coupling state by being fitted inside.

  As shown in FIGS. 15 to 19, an example of a method of using the transport carriage 1 provided with the automatic connection means 37 a and 37 b as described above is, for example, a straight traveling route portion 47 between two horizontal curve route portions 31 </ b> A and 31 </ b> B. In the layout in which the crossing passage 48 is provided, the cam rail 46 is laid on the entrance side of each horizontal curve path portion 31A, 31B. In addition, the load bar for friction drive of the transport carriage 1 can be driven individually and continuously through the horizontal curve path section 31A, the straight travel path section 47, and the horizontal curve path section 31B in this order. Friction driving means 25 </ b> A to 25 </ b> D are provided at intervals slightly shorter than the total length of 11. In the illustrated layout, the length of the straight travel path 47 is short, so that the friction drive means 25B on the exit side of the horizontal curve path section 31A and the friction drive means 25C on the entrance side of the horizontal curve path section 31B have a straight travel path. The unit 47 also serves as a means for driving the transport carriage 1 to travel. In the crossing passage 48, guide rails 5a and 5b that form the travel route of the transport carriage 1 and the guide rail 24 for restricting the travel direction are not laid, and the free wheels 6 to 8 of the transport carriage 1 are crossed. The guide rails 5a and 5b divided by the passage 48 are configured to roll on the floor surface of the transverse passage 48 formed flush with the rolling surfaces of the universal wheels.

  In the above configuration, the operation when the transport carriage 1 travels through the horizontal curve path portions 31A and 31B under the driving action of the friction drive means 25A, 25B and 25C, 25D is detailed based on FIGS. As described above, when the transport carriage 1 enters the horizontal curve path portions 31A and 31B, the cam rail 46 is connected to the automatic connection means 37a and 37b, and the front portion where the automatic connection means 37a and 37b are connected. Since the carriage alone 3 and the central carriage alone 2 and the central carriage alone 2 and the rear carriage alone 4 are switched from the connected state to the disengaged state immediately before the refractive movement along the horizontal curve path portions 31A and 31B starts, Each of the carts 2 to 4 can travel through the horizontal curve path portions 31A and 31B with no problem with the refraction motion. Then, when the cam follower roller 45 of the swing arm 41 is detached from the cam rail 46, the automatic coupling means 37a and 37b are brought into a state in which the automatic coupling can be performed from the disengaged state. It will drive 31B.

  When the transport carriage 1 enters the straight travel path section on the lower side from the horizontal curve path sections 31A and 31B, the transport carriage 1 changes to a straight traveling posture in which the individual trucks 2 to 4 are in series. When the front and rear carts 3, 2 and 2, 4 that have been separated due to refraction are close to each other, the automatic coupling means 37a and 37b are automatically switched from the detached state to the coupled state as described above. The front and rear carts 3, 2 and 2, 4 are connected to each other and integrated by the automatic connecting means 37a, 37b.

  Accordingly, in the process in which the transport carriage 1 sent in a straight line posture by the friction drive means 25B from the horizontal curve path portion 31A to the linear travel path portion 47 is sent to the next horizontal curve path portion 31B by the friction drive means 25C, When the individual carts 2 to 4 of the cart 1 sequentially travel through the crossing passage 48, the front cart 3 is driven by the rear friction drive means 25B as shown in FIG. Alternatively, it passes through the transverse passage 48 while being pushed by the rear carriage alone 4, but as shown in FIG. 18, the central carriage alone 2 or the rear carriage alone 4 has a pushing driving force from the rear friction drive means 25B. The travel direction regulating guide rail 24 is provided in a state where it is pulled by the front carriage 3 driven by the front friction drive means 25C without receiving Situation that passes through the transverse passage 48 does not occur. Even in such a situation, the central cart unit 2 and the rear cart unit 4 are connected to the front cart unit 3 and the central cart unit 2 via the automatic coupling means 37a and 37b. The central carriage unit 2 and the rear carriage unit 4 that are pulled by the front carriage unit 3 and the central unit unit 2 on the front side have a straight running posture without horizontal swinging movements around the joint axes 18b and 19b. Thus, the vehicle can travel through the crossing passage 48 without any problem.

  The swinging arm 41 in the automatic connecting means 37a, 37b is configured to be able to be held alternatively between the horizontal connecting position and the upward moving / disengaging position by using, for example, a two-position switching spring. It is also possible to use a connecting means that uses both the cam rail 46 that switches from the connected posture to the upwardly moving and detached posture, and conversely, the cam rail that switches from the upwardly moving and disconnected posture to the horizontally connected posture.

  The friction-driven trolley-type transfer device of the present invention is a friction-driven trolley-type transfer that is suitable for performing assembly work on the vehicle body in a state where an operator is on the transfer trolley that supports the vehicle body of the vehicle in an automobile assembly line. Can be used as a device.

DESCRIPTION OF SYMBOLS 1 Conveyance carriage 2 Central carriage simple substance 3 Front carriage simple substance 4 Rear carriage simple substance 5 Guide rail 6-8 Swivel wheel 9a, 9b Conveyed object support base 10 Lift drive means 11, 34 Friction drive load bar 12a-12c, 35a- 35c Load bar unit 16-19 Guide roller 18b, 19b Joint axis 24 Travel direction regulating guide rail 25, 25A-25D, 36 Friction drive means 26 Friction drive wheel 27 Backup roller 31, 31A, 31B Horizontal curve path portion 32, 33, 47 Linear travel path portion 37a, 37b Automatic connecting means 38 Hook member 40 Engaging portion 41 Swing arm 42 Spring 45 Cam driven roller (operated portion)
46 Cam rail (operating means)
48 Crossing passage

Claims (6)

A conveyance carriage provided with a friction drive load bar provided parallel to the traveling direction so as to be continuous over the entire length of the carriage, and a friction drive wheel disposed on the traveling path side of the conveyance carriage and in pressure contact with the load bar a friction drive of the carriage type conveying apparatus comprising a friction drive means is, the transfer carriage is constituted by a plurality of carriage units in series in the running direction, each carriage alone, the left and right conveyance carriage in straight posture The friction drive load bar is connected to a plurality of load bars separately for each carriage. The friction drive load bar is connected to bend freely around a vertical joint axis located on a straight line parallel to the running direction at one side. Each load bar unit is a friction drive cart type transport device attached to each cart unit at a position on the straight line ,
Each load bar of the friction drive load bar is connected to bendable horizontally by a vertical support shaft concentric with the joint axis between the carts, and each cart of the transport cart is attached to each cart. The load bar alone and the vertical support shaft are connected to be able to be bent horizontally,
A friction-driven cart-type transfer device in which the vertical support shaft between each load bar is arranged at a position overlapping with any one of the front and rear carts rather than a position between the carts adjacent to each other . The friction drive load bar is rotatably supported by guide rollers that are rotatable about vertical axes at the joint axial positions between both ends and the middle, and each guide is disposed on the traveling path side of the transport carriage. The friction-driven cart type conveying device according to claim 1, wherein a guide rail with which the roller is engaged is disposed . The carriage is composed of three carriages in series, the central carriage alone is provided with a carrier support base and a lift driving means for the carrier support base, and the carriages on the front and rear carriages alone are provided with the carriage carrier. Work floors are provided to project from the front and rear ends of the object to be conveyed supported on the object support table, and the elevating drive means is separated from the load bar unit attached to the center vehicle unit to the center side of the vehicle. The friction-driven cart-type transfer device according to claim 1, wherein the friction-driven cart transport device is protruded from the lower side of the central cart at a position . The transport carriage is provided with a second friction drive load bar on the side opposite to the side on which the friction drive load bar is attached, and the second friction drive load bar is It is composed of a single load bar that is mounted separately on each carriage so that it is in series on a straight line parallel to the running direction when the carriage is in a straight running posture. The second friction driving means acting on the second friction driving load bar is provided separately from the friction driving means . 5. Friction-driven cart-type transfer device. The transporting carriage is provided with a detachable connecting means capable of connecting the carts adjacent to each other in the front and rear sides on the side opposite to the side on which the friction drive load bar is attached. 5. The friction according to claim 1 , wherein operation means for switching the connecting means to a disengaged state is disposed at least before the horizontal curve path portion in the travel path of the transport carriage. Driving cart type transport device. The connecting means is an automatic connecting means that automatically switches to the connected state when the front and rear carts are returned from the bending posture swinging around the joint axis to the straight running posture, and is in a detached state from the connected state. The automatic connection means is operated from the connected state by operating the operated portion at least in a transition section from the straight traveling route portion to the horizontal curve route portion in the traveling route of the transport carriage. 6. The friction-driven cart-type transfer device according to claim 5 , wherein a cam rail that is switched to a disengaged state is provided.

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