JP5708912B2 - Truck-type transfer device using tow truck - Google Patents

Description

  The present invention relates to a trolley-type transporting device using a traction vehicle comprising a combination of a self-propelled traction vehicle and a transport trolley coupled to the traction vehicle.

  As described in Patent Document 1, the trolley-type transfer device using the traction vehicle as described above supports the front end portion of the conveyance trolley from below so that the traction vehicle also serves as a front wheel of the conveyance trolley. In a state where the tow vehicle-side fitting member and the conveying cart-side fitting member are fitted to each other in the up-down direction, and as described in Patent Document 2, a self-standing having a front wheel and a rear wheel A structure in which the towing vehicle enters the lower side of the front end of the possible conveyance carriage, and a configuration in which the fitting member on the conveyance carriage side and the fitting member on the towing truck side are fitted to each other in the vertical direction at these overlapping positions. Things are known.

JP 2009-227160 A JP 2008-239080 A

  In the cart type transfer device using a tow truck described in Patent Document 1, the cart cannot be used separately from the towing vehicle. In addition, in the cart-type transfer device using a tow vehicle described in Patent Document 2, the transfer cart can be used separately from the tow vehicle, but a large and heavy object to be conveyed such as an automobile body is loaded. If the tow truck is to be pulled by a tow truck that is connected to the transport cart in a state of entering the lower side of the transport cart, the tow truck is below the transport cart of the low floor structure. It has a very low floor structure that can enter, and the width is also narrowed in relation to the wheel of the conveyance carriage, so that it becomes small and lightweight, so that the driving wheel of the towing vehicle does not cause slipping and it is large and heavy It is difficult to reliably tow the transport cart loaded with the objects to be transported. Therefore, in the case of pulling a transport carriage loaded with a large and heavy object to be transported, the structure described in Patent Document 1 can allow a part of the weight of the object to be transported to be handled by the tow car. However, it has been necessary to use a large and heavy traction vehicle at the expense of using a trolley-type transfer device using a tractor or a low floor structure.

The present invention proposes a trolley-type trolley-type transfer device capable of solving the conventional problems as described above, and the trolley-type trolley-type trolley according to the present invention according to claim 1. In order to facilitate understanding of the relationship with the embodiment described later, the transport device, when attached with reference numerals used in the description of the embodiment in parentheses, a self-propelled tow vehicle (1), Conveying carriage (2) provided with front wheels (5) and rear wheels (6), and connecting means (41) for connecting the towing vehicle (1) and the conveying carriage (2) to each other. ) is a carriage-type conveyance device of the towing vehicle utilization comprises a pair of upper and lower engaging members to be fitted each other in the vertical direction is attached to the towing vehicle (1) and the transport vehicle (2) (25, 43) The pair of upper and lower fitting members (25, 43) of the connecting means (41) are provided with contact portions (25a, 52a) that contact each other in the vertical direction and regulate the fitting depth, This up and down Of the pair of fitting members (25, 43), one fitting member (43) is supported by the support member (42) so that it can be raised and lowered within a certain range, and the other fitting member ( 25), when a pair of upper and lower fitting members (25, 43) that are fitted to each other are in contact with each other at the contact portion (25a, 52a), the spring (45) One of the fitted members (43) is configured to be in a state of being retracted against the urging force of the spring (45) with respect to the support member (42). In the transport device,
The support member (42) is threaded through a vertical screw hole (51) provided in the airframe (2A) of the transport carriage (2) so that the height can be adjusted, and the support truck (2) side The fitting member (43) is mounted in the central hole (44) of the support member (42) so as to be movable up and down, and a spring receiver (upper end side of the central hole (44) of the support member (42) ( 46) and the fitting member (43) and is biased downward by the spring (45), and downward from the lower end opening of the central hole (44) of the support member (42). The conveyance carriage (2) is configured to be provided with an operation opening (53) for rotating the support member (42) from above the conveyance carriage (2) .

  According to the configuration of the present invention described above, when the towing vehicle and the conveyance carriage are in a connected state in which the fitting member on the towing vehicle side and the fitting member on the conveyance carriage side are fitted to each other and abut in the vertical direction. By applying the biasing force of the spring downward to the towing vehicle, the ground pressure of the driving wheel of the towing vehicle can be made higher than the ground pressure given by the weight of the towing vehicle. Therefore, if the engagement member on the tow vehicle side and the engagement member on the transport carriage side are simply engaged in the vertical vertical direction, the drive wheel of the tow truck slips, and the transport carriage can be pulled and moved. Even in situations where it is not possible, for example, in situations where the tow truck is smaller and lighter than the total weight of the transport carriage loaded with the object to be transported, the ground pressure of the driving wheel of the tow truck is increased by the spring force, It becomes possible to reliably pull and move the transport carriage loaded with the objects to be transported. In addition, compared to a trolley-type transfer device using a tow truck that supports the front end of the transfer carriage with only the rear wheels on the towing vehicle and applies the load on the front end of the transfer carriage to the towing vehicle. Since the carriage itself can be made independent by the front and rear wheels stably and can be moved freely even in a state where it is separated from the towing vehicle, it is convenient for handling the conveyance carriage itself.

  When carrying out the present invention, specifically, as described in claim 2, the fitting member (25) on the side of the towing vehicle (1) is a pair of left and right drive wheels ( The spring biasing force can be efficiently applied to increase the ground contact pressure of the driving wheel of the towing vehicle by being disposed at the central position between 7a and 7b). According to a third aspect of the present invention, the spring (45) includes the fitting member (43) supported by the support member (42) so as to be movable up and down, and a spring provided on the support member (42). The spring receiver (46) may be provided so as to be adjustable in the axial direction of the compression coil spring (45). According to this configuration, the extent of the increase in the contact pressure of the driving wheel of the towing vehicle due to the biasing force of the spring does not cause a situation in which the wheel of the transport carriage close to the coupling position with the towing vehicle does not rise from the floor surface. Thus, it can be adjusted to the optimum maximum value according to the weight of the object to be transported loaded on the transport carriage.

Furthermore, as described in claim 4 , of the pair of upper and lower fitting members (25, 43), one fitting member (25) is constituted by a shaft body having a pointed portion (25a), and the other In the fitting member (43), a connecting hole (52) is provided concentrically from the end face so that the one fitting member (25) is fitted around the vertical axis so as to be relatively rotatable. The abutting portion can be constituted by the pointed end portion (25a) of the joint member (25) and the bottom surface (52a) of the connecting hole (52) of the other fitting member (43).

Further, as described in claim 5 , the support member (42) is attached to the body of the transport carriage so that the height can be adjusted, and the support member (42) is attached to the body (2A) of the transport carriage (2). The fitting member (43) lowered to the lowering limit by the urging force of the spring (45) with respect to the support member (42) when the raising member is raised to the raising limit, the fitting on the towing vehicle (1) side. It can comprise so that it may detach | leave upward from a joint member (25). According to this configuration, compared to the case where the fitting member on the towing vehicle side is supported so as to be movable up and down and biased upward by the spring, the height adjustable support on the conveying carriage side located above the towing vehicle is supported. Since there is a member, the height of the support member can be easily adjusted, and a mechanism for adjusting the height can be easily implemented.

When carrying out the configuration according to claim 5 , as described in claim 6 , the support member (42) has a vertical screw hole provided on the airframe (2 A) side of the transport carriage (2). A screw shaft portion (42c) that is threadably penetrated with respect to (51), a descent limit stopper (47) that is screwed into the upper end side of the screw shaft portion (42c) so as to be adjustable in height, and this support A rising limit stopper (50) provided on the lower end side of the member (42), a rotation operation angular shaft portion (42b) around the upper end of the support member (42), and the spring receiver (46) A rotation operation part (46a) can be provided at the upper end of the head. According to this configuration, the adjustment of the initial compressive stress (initial biasing force) of the spring and the operation of raising and lowering the fitting member on the transport carriage side during the connection / disconnection operation of the tow truck and the transport carriage are performed from the upper side of the transport carriage. Easy and easy to do. Of course, it is desirable to attach a detachable cover plate (54) to the operation opening (53).

FIG. 1A is a plan view of a transport cart with a tow vehicle, and FIG. 1B is a side view showing the transport cart with a tow vehicle in a transport path. FIG. 2A is a plan view of the tow vehicle with the upper cover plate removed, and FIG. 2B is a longitudinal side view of the tow vehicle. FIG. 3 is a front view of a transport carriage with a towing vehicle. FIG. 4 is a longitudinal front view at the driving wheel position of the transport carriage with a towing vehicle. FIG. 5 is a longitudinal rear view at the free wheel position of the transport carriage with a towing vehicle. FIG. 6A is a plan view of the transport cart with the upper cover plate removed, and FIG. 6B is a side view of the transport cart. FIG. 7 is a plan view showing a connected portion of the transport carriage. FIG. 8 is a longitudinal sectional front view showing a connected portion of the transport carriage. FIG. 9 is a longitudinal sectional front view of the main part showing a state immediately before the coupled shaft body of the transport carriage is fitted to the towing vertical shaft body of the towing vehicle. FIG. 10 is a longitudinal front view of the main part showing a state where the coupled shaft body of the transport carriage is fitted to the vertical shaft body for towing of the towing vehicle. FIG. 11 is a longitudinal sectional front view of the main part showing a state where the towing vehicle is lifted on the conveyance carriage side. FIG. 12 is a side view of the main part showing a state in which the towing vehicle is lifted on the conveyance carriage side. FIG. 13A is a plan view of a main part showing a state during maintenance work for the rear half of the tow vehicle, and FIG. 13B is a plan view of a main part showing a state during maintenance work for the front half and the rear half of the tow truck.

  In FIG. 1, reference numeral 1 denotes a tow vehicle, and 2 denotes a transport cart towed by the tow vehicle 1. The transport carriage 2 includes a pair of left and right front transport object supports 3 that support the front end side of a transported object W such as an automobile body, and a pair of left and right rear transport covers that support the rear end side of the transported object W. A transported object support 4 is projected, and at the bottom, a pair of left and right front universal wheels 5 positioned near the lower side of the front transported object support 3 and the lower vicinity of the rear transported object support 4 A pair of left and right rear-side fixed wheels 6 that are positioned and fixed in the forward direction are provided. The towing vehicle 1 can travel forward on the lower side of the transport carriage 2 via a pair of left and right front transport object supports 3 and a pair of left and right rear transport object supports 4. A pair of left and right drive wheels 7a, 7b, which have a flat low floor structure with limited height and width, and whose directions are fixed in the forward direction and can be driven separately, are near the center position in the length direction. In addition to being provided, a universal wheel 8 is provided at the center in the width direction near the rear end.

  The detailed structure of the towing vehicle 1 will be described with reference to FIGS. 2, 4 and 5. As shown in FIG. 2, the body 1A of the towing vehicle 1 includes a plurality of vertical frame members 9a and 9b on both right and left sides. Are connected by the horizontal frame members 10a to 10d, and a narrow U-shaped frame 11 protrudes rearward from the rear end horizontal frame member 10d, and includes a front end horizontal frame member 10a and a second horizontal frame member 10b. A bottom plate 14 forming a control device storage space 13 for storing the control device 12 is stretched between the vertical frame members 9a and 9b between the third frame member 10c and the rear end frame member 10d. Between the vertical frame members 9a and 9b, a bottom plate 17 that forms a battery storage space 16 for storing a plurality of batteries 15 is stretched. Between the second horizontal frame member 10b and the third horizontal frame member 10c, a pair of left and right drive unit mounting members 18a along the vertical frame members 9a and 9b above the horizontal frame members 10b and 10c. 18b is installed on both drive unit mounting members 18a and 18b from the drive wheels 7a and 7b and motors 19a and 19b with speed reducers for driving the drive wheels 7a and 7b in the forward and reverse arbitrary directions. The drive units 20a and 20b are attached so that the pair of left and right drive wheels 7a and 7b are symmetrical with respect to the center line of the body 1A.

  Between the horizontal frame member 10d at the rear end of the airframe 1A and the rear end portion of the U-shaped frame 11, a support plate 21 is installed in the front-rear direction on the upper side of the horizontal frame member 10d and the U-shaped frame 11. The wheel 8 has a vertical rotating shaft 22 supported on the lower side of the support plate 21 so as to be able to rotate about a vertical axis, and on the left and right sides of the lower end of the vertical rotating shaft 22 on the center line of the airframe 1A. It consists of a pair of left and right idle wheels 23a, 23b that are pivotally supported so as to be symmetrical with respect to the left and right.

  Between the second horizontal frame member 10b and the third horizontal frame member 10c of the airframe 1A, a central vertical length in the front-rear direction so as to follow the center line of the airframe 1A between the pair of left and right drive units 20a and 20b. A frame member 24 is installed on the upper side of the central vertical frame member 24 at an intersection where the common axis of the drive wheels 7a and 7b of the left and right drive units 20a and 20b intersects with the center line of the airframe 1A in plan view. A traction vertical shaft body 25 is concentrically provided through a mounting seat 25 a and a mounting seat plate 26 at the lower end of the traction vertical shaft body 25. As shown in FIGS. 2A and 11, the mounting seat plate 26 has vertical screw holes 27a and 27b extending over the lower central vertical frame member 24 in a longitudinally symmetrical position with respect to the pulling vertical shaft body 25, respectively. Is provided.

  In addition, on the front side of the front frame member 10a of the airframe 1A, an obstacle collision detection edge switch 28 having a length capable of covering the entire lateral width of the airframe 1A for detecting a collision with another object, and in a predetermined front area. An obstacle sensor 29 for detecting the obstacle is attached. Further, cover plates 30a to 30d are screwed to the entire upper side of the machine body 1A. These cover plates 30a to 30d are free from at least a front half region and a rear half region of the control device storage space 13, a central region between the horizontal frame members 10b and 10c in which the drive units 20a and 20b are disposed, and the battery storage space 16. The wheel 8 is divided for each region including the rear end portion, and is screwed so that it can be attached and detached separately. The cover plate 30c in the central region is provided with an opening through which the pulling vertical shaft body 25 passes and protrudes upward.

  Next, the detailed structure of the transport carriage 2 will be described with reference to FIGS. 6 to 10. The airframe 2A of the transport carriage 2 has a rectangular planar shape in the front-rear direction, and the vertical frame members 31a and 31b on both the left and right sides. Horizontal frame members 32a to 32g that connect and integrate the vertical frame members 31a and 31b to each other at a plurality of positions in the front-rear direction, and positions where the second and third horizontal frame members 32b and 32c are close to the vertical frame members 31a and 31b on the sides. Intermediate vertical frame members 33a and 33b, which are connected to each other at two left and right positions, and fourth and fifth horizontal frame members 32d and 32e, which are connected to each other on the center line of the machine body 2A, and sixth And the rear vertical frame members 32f and 32g are connected to each other at two positions on the left and right sides of the side frames near the vertical frame members 31a and 31b. Horizontal frame members 32d, 32e It said front conveyed object support 3 and the rear conveyed object support 4 to the left and right two places is projected. And between the two horizontal frame members 32c, 32d and the horizontal frame members 32e, 32f that are close to each other in parallel at two locations near the center, the vertical frame members 31a, 31b on the side are approached. Wheel mounting seats 34a, 34b and 35a, 35b are installed at two left and right locations, and the pair of left and right front universal wheels 5 are attached to the lower side of the pair of left and right wheel mounting seats 34a, 34b on the front side. The left and right pair of rear-facing fixed wheels 6 are attached to the lower side of the pair of left and right wheel mounting seats 35a and 35b.

  Between the horizontal frame member 32a at the front end of the machine body 2A and the second horizontal frame member 32b, a pair of left and right vertical connecting members 36a, 36b at positions close to the center line of the machine body 2A, and both of these vertical connecting members 36a, A pair of left and right support plates 37a and 37b projecting from both the vertical connecting members 36a and 36b to the center line side of the machine body 2A are installed under the side of 36b. Both ends of the connecting plate 38 are mounted and fixed. Further, on the machine body 2A of the transport carriage 2, intermediate frames for supporting the left and right vertical frame members 31a and 31b, the front side horizontal frame member 32a, the second horizontal frame member 32b, and the transported object supports 3 and 4 are provided. A rectangular region (front end) surrounded by the frame members 31a to 32g with the upper surfaces of the two horizontal frame members 32d and 32e, the rear horizontal frame member 32g, and the vertical connecting members 36a and 36b at the front end exposed. The cover plates 39a to 39l that respectively cover the vertical connecting members 36a and 36b (except for the rectangular region between the vertical connecting members 36a and 36b) are detachably screwed. Further, an inter-machine cover plate 40 extending rearward over the entire width of the machine body 2A is mounted on the rear frame member 32g. This inter-machine cover plate 40 is formed such that the middle part in the front-rear direction protrudes in a mountain shape over the entire lateral width, and the height of the rear side is configured to be slightly higher than the height of the airframe 2A. Yes.

  As shown in FIGS. 7 to 10, the connecting means 41 between the towing vehicle 1 and the transport carriage 2 is fitted to the pulling vertical shaft 25 as a fitting member on the tow truck 1 side and the transport cart 2 side. It is comprised from the to-be-connected shaft body 43 as a member. The configuration of the connecting means 41 on the transport carriage 2 side will be described in detail. The connecting means 41 on the transport carriage 2 side can be adjusted in height to the center position of the connecting plate 38 at the center of the front end of the body 2A of the transport carriage 2. A cylindrical support member 42 attached, a connected shaft body 43 projecting downward from the center of the lower end of the support member 42, a compression coil spring 45 housed in the center hole 44 of the support member 42, and a center hole of the support member 42 A spring receiver 46 that is screwed into a screw hole 44a formed in the upper end region of the portion 44 so as to be adjustable in height, and a ring-shaped descent limit stopper 47 that is attached to the support member 42 so as to be fixed in height. ing.

  The cylindrical support member 42 has a screw shaft portion 42c on the outer peripheral surface from the large-diameter flange portion 42a at the lower end to the angular shaft portion 42b for rotation operation at the upper end, on the large-diameter flange portion 42a at the lower end. The tow vehicle lifting plate 48 is loosely supported so as to be freely rotatable around the support member 42, and a ring-shaped distance piece 49 is loosely supported on the tow vehicle lifting plate 48. And the ring-shaped distance piece 49, the ascending limit stopper 50 is formed, and a screw hole 51 that vertically penetrates the screw shaft portion 42c of the support member 42 is provided at the center of the connecting plate 38 on the side of the machine body 2A. The ring-shaped descent limit stopper 47 is screwed onto the screw shaft portion 42c of the support member 42 that is screwed upward from the lower side and protrudes upward from the connecting plate 38. The ring-shaped descent limit stopper 47 is rotated to adjust the height with respect to the support member 42, and then the circumferential split portion is fastened with the fastening bolt 47a to reduce the diameter so that the support member 42 is reduced in diameter. Can be fixed.

  The connected shaft body 43 is received by the lower end of the central hole 44 of the support member 42 in the large-diameter flange portion 43a at the upper end, and the vertical shaft body 25 for towing on the towing vehicle 1 side is turned upward so as to be relatively rotatable. A connecting hole 52 that fits inside is concentrically cut from the lower end. The depth of the connecting hole 52 is set such that the bottom surface 52a facing downward contacts the pointed portion 25a of the pulling vertical shaft body 25 on the towing vehicle 1 side. The compression coil spring 45 is interposed between the spring receiver 46 and the coupled shaft body 43, and urges the coupled shaft body 43 downward by the compression reaction force. Thus, a square hole portion 46a for rotational operation is provided in the center of the upper surface of the spring receiver 46, and the height of the compression coil spring 45 is adjusted by rotating the spring receiver 46 to adjust the height relative to the support member 42. The initial compression force can be adjusted.

  The towing vehicle lifting plate 48 that is loosely supported by the support member 42 and constitutes a part of the ascending limit stopper 50 is a through-hole 48a that penetrates perpendicularly to both ends projecting to the front and rear sides of the connecting plate 38 in plan view. , 48b are provided. The pair of through-holes 48 a and 48 b are in a connected state between the towing vehicle 1 and the transport carriage 2 in which the towing vehicle 1 side towing vertical shaft body 25 is fitted in the connecting hole 52 of the connected shaft body 43. A pair of front and rear vertical screw holes provided on the mounting seat plate 26 of the vertical shaft body 25 for traction on the traction vehicle 1 side by rotating the traction vehicle lifting plate 48 around the support member 42 as necessary. 27a and 27b can be matched with each other. The operation opening 53 on the upper side of the connecting means 41, that is, the operation opening at the upper end of the rectangular area surrounded by the front end, the second horizontal frame members 32a and 32b, and the pair of left and right vertical connecting members 36a and 36b. A removable cover plate 54 different from the cover plates 39a to 39l is placed on the portion 53.

  When connecting the tow truck 1 and the transport carriage 2 configured as described above, the cover plate 54 covering the rectangular area in which the connecting means 41 of the transport carriage 2 is installed is removed, as shown in FIG. Further, the support member 42 is rotated in the screw return direction by using the rotation operation angular shaft portion 42b at the upper end, and the support member 42 is moved to the upper limit where the distance piece 49 of the lower limit stopper 50 is in contact with the connecting plate 38. The connection plate 38 is raised. At this time, the coupled shaft body 43 supported by the support member 42 is lowered to the lower limit position where the large-diameter flange portion 43a is supported at the bottom of the central hole portion 44 of the support member 42 by the urging force of the compression coil spring 45. The height on the floor surface of the lower end of the coupled shaft 43 at this time is the tip of the vertical shaft 25 for traction protruding from the upper side surface (the surface of the cover plates 30a to 30d) of the traction vehicle 1. It is comprised so that it may become a little higher than the height on the floor surface of the part 25a. In this state, the carriage 2 is placed so as to cover the towing vehicle 1 waiting on the floor surface, and the towing vehicle 1 is parallel between the front free wheel 5 and the rear-facing fixed wheel 6 of the carriage 2. The to-be-connected shaft body 43 projecting from the lower end of the support member 42 that is pushed and moved so as to be relatively moved and held at the ascending limit position on the transport carriage 2 side of the pulling vertical shaft body 25 on the towing vehicle 1 side. The transport carriage 2 is stopped in a state of being directly above the pointed end portion 25a.

  Next, as shown in FIG. 10, the support member 42 is rotated in the screwing direction using the upper end rotation operation angular shaft portion 42 b, and the support member 42 is lowered with respect to the connecting plate 38. When the support member 42 is lowered, first, the connecting hole 52 of the connected shaft body 43 is externally fitted to the pulling vertical shaft body 25 on the towing vehicle 1 side, and the pointed portion 25a of the pulling vertical shaft body 25 is connected to the connecting hole. Since the lowering of the coupled shaft body 43 is stopped at the height abutting against the bottom surface 52a of 52, only the support member 42 descends with respect to the coupled shaft body 43 thereafter. When the distance between the spring 43 and the spring receiver 46 is reduced, the compression coil spring 45 is compressed, and the compression reaction force acts downward on the towing vertical shaft body 25 on the towing vehicle 1 side via the connected shaft body 43. Will do. Then, when the lowering support member 42 reaches the lowering limit where the lowering limit stopper 47 abuts on the upper side surface of the connecting plate 38 as shown in FIG. 10, the pulling vertical shaft body 25 on the towing vehicle 1 side and the transport carriage Connection by fitting with the connection hole 52 on the second side is completed. At this time, the compression reaction force of the compression coil spring 45 of the connecting means 41 on the transport carriage 2 side is applied to the pair of left and right drive wheels 7a and 7b on the towing vehicle 1 side from the connected shaft body 43 to the towing vertical shaft body 25, It is transmitted downward to the drive wheels 7a, 7b via the body 1A of the tow vehicle 1, the drive unit mounting members 18a, 18b, and the motors 19a, 19b with reduction gears, and the ground pressure of the drive wheels 7a, 7b is increased. ing. When the connection between the towing vehicle 1 and the transport carriage 2 is completed, the removed cover plate 54 is put on the operation opening 53 on the upper side of the connection means 41 of the transport carriage 2 to cover it. .

  By connecting the tow truck 1 and the transport carriage 2 as described above, the ground pressure of the pair of left and right drive wheels 7a and 7b on the tow truck 1 side is increased by the compression coil spring 45 provided in the connection means 41 on the transport carriage 2 side. The ground pressure of the drive wheels 7a and 7b at this time, that is, the magnitude of the compression reaction force of the compression coil spring 45 can be adjusted by adjusting the height of the spring receiver 46 relative to the support member 42 or by the connecting member 38. By adjusting the lower limit of the support member 42 relative to the lower limit, that is, the height of the lower limit stopper 47 relative to the support member 42, it can be arbitrarily adjusted within a certain range. The towing vehicle 1 can rotate with respect to the transport carriage 2 around the pulling vertical shaft 25 of the connecting means 41, but at the rear side of the rotation trajectory of the towing vehicle 1 with respect to the transport carriage 2 at this time, A pair of left and right front wheels 5 of the transport carriage 2 are disposed.

  Thus, by driving the pair of left and right drive wheels 7a and 7b of the tow truck 1 connected to the transport carriage 2 at a constant speed in the forward direction by motors 19a and 19b with speed reducers, the tow truck 1 moves straight. Then, the transport carriage 2 is towed by the pulling vertical shaft body 25 on the towing vehicle 1 side so as to be swingable in the left-right direction around the pulling vertical shaft body 25. Steering vehicle 1 can be steered freely by making a difference between the rotational speeds of the pair of left and right drive wheels 7a and 7b, so that the towing vehicle 1 and the transport carriage 2 to be pulled by the towing vehicle 1 are set on the floor surface. It is possible to travel along the travel route. At this time, since the ground pressure of the pair of left and right drive wheels 7a and 7b of the towing vehicle 1 is increased as described above, the transport carriage 2 temporarily loads a heavy transport object W such as an automobile body. Even in this case, the strength of the compression coil spring 45 in the connecting means 41 on the transport carriage 2 side can be increased so that the ground pressure corresponding to the traction load at this time can be generated in the pair of left and right drive wheels 7a and 7b. By setting the initial compressive stress, the transport carriage 2 can be reliably towed without causing the tow truck 1 to slip.

  As described above, the tow truck 1 can be towed by the tow truck 1 on a fixed travel route. However, the tow truck 1 is flat so that the entire tow truck 1 can travel between the transport carriage 2 and the floor surface. Since it is of a low floor structure, as shown in FIG. 1B, the front half of each towing vehicle 1 protruding forward from the front end of the towed carriage 2 enters the lower side of the preceding preceding carriage 2 and It is possible to run while maintaining a form in which the front and rear ends of the transport carriage 2 that are adjacent to each other and are pulled by the towing vehicle 1 are continuous with a small gap therebetween. At this time, the inter-machine cover plate 40 extending rearward from the rear end side of the machine body 2A of the immediately preceding transport carriage 2 covers the front end of the machine body 2A of the immediately subsequent transport carriage 2 and is adjacent to the front and rear. A gap between the machine bodies 2A of the transport carriage 2 is closed.

  As described above, the towing vehicle 1 pulls the transport carriage 2 and when the motors 19a and 19b with speed reducers of the drive units 20a and 20b break down, the self-propelled state becomes impossible. 7, 8, and 11, the cover plate 54 that covers the operation opening 53 on the upper side of the connecting means 41 of the transport carriage 2 is removed, and the lateral frame members 32a and 32b, the support plate 37a, 37b and a towing vehicle lifting plate 48 rotatably supported on the large-diameter flange portion 42a at the lower end of the support member 42 by inserting a hand from a space before and after the connecting plate 38 surrounded by the connecting plate 38. The support member 42 is rotated around to allow the through holes 48a and 48b at both ends thereof to face the space before and after the connecting plate 38, and the pulling vertical shaft body 25 of the towing vehicle 1 positioned below the support member 42 is the airframe. Positioning a pair of vertical threaded holes 27a before and after the mounting seat plate 26 which is attached to A, 27b and the through hole 48a, and 48b vertically substantially concentrically. In this state, as shown in FIG. 11, bolts 55a and 55b inserted from above into the through holes 48a and 48b of the towing vehicle lifting plate 48 are screwed and connected to the vertical screw holes 27a and 27b on the towing vehicle 1 side. Then, the support member 42 is lifted up integrally with the support member 42 by rotating the support member 42 in the screw return direction and raising it with respect to the connection plate 38 as in the preparation stage of the connection with the transport carriage 2. Via the vehicle lifting plate 48 and the two bolts 55a and 55b, the vicinity of the center in the length direction where the driving wheels 7a and 7b of the towing vehicle 1 are arranged can be lifted to the transport carriage 2 side.

  As is clear from the above description, in this embodiment, the towing vehicle lifting means 56 provided on the transport carriage 2 is a support that can be moved up and down to constitute the connecting means 41 that connects the towing truck 1 and the transport carriage 2. A member 42, a towing vehicle lifting plate 48 rotatably supported around the vertical axis of the supporting member 42, vertical screw holes 27 a and 27 b provided on the body 1 </ b> A side of the towing vehicle 1, and It comprises bolts 55a and 55b that pass through the towing vehicle lifting plate 48 downward and are screwed into the vertical screw holes 27a and 27b.

  As shown in FIG. 2, the towing vehicle 1 is provided with a towing vertical shaft body 25 and a pair of left and right drive wheels 7a and 7b in the vicinity of the center in the length direction, and the drive units 20a and 20b behind the position. The battery housing space 16 loaded with the motors 19a, 19b with the speed reducer and the battery 15 is disposed, and the free wheel 8 is disposed at the rear end. Therefore, the center of gravity of the body 1A is located more than the vertical shaft body 25 for traction. Located on the rear end side. Accordingly, when the two front and rear parts of the vertical shaft body 25 for towing of the towing vehicle 1 are lifted by the bolts 55a and 55b from the conveying carriage 2 side, the towing vehicle 1 has the free wheel 8 at the center position of the rear end as shown in FIG. The pair of left and right drive wheels 7a and 7b are lifted from the floor surface by tilting forward to the fulcrum. The towing vehicle lifting plate 48 that lifts the towing vehicle 1 via the bolts 55a and 55b is rotatable around the support member 42, and the towing vehicle 1 side towing vertical shaft 25 is connected to the support member 42. The towing vehicle 1 that is lifted and grounded only at the rear end of the free wheel 8 is fitted to the connecting hole 52 that is concentrically arranged. You can rotate around. Accordingly, the periphery of the transport carriage 2 can be pushed in any direction, and the transport carriage 2 together with the towing vehicle 1 can be easily moved out of the travel route.

  In the state where the tow truck 1 and the transport carriage 2 are connected as described above, the rear half portion of the tow truck 1 including the battery storage space 16 enters the lower side of the transport carriage 2. 13, among the cover plates 39a to 39l covering the upper surface of the transport carriage 2, a rectangular region surrounded by the horizontal frame members 32b and 32c and the intermediate vertical frame members 33a and 33b of the machine body 2A, that is, the bottom The cover plate 39d is removed by removing the cover plate 39d that covers a rectangular region that is located directly above the battery storage space 16 of the tow truck 1 and that has a larger planar area than the battery storage space 16. The cover plate 30d covering the battery storage space 16 of the towing vehicle 1 is removed through a rectangular opening having a large removal mark, and the battery storage space 16 is removed. Since the battery 15 can be released, the maintenance of the battery 15 can be easily maintained while remaining on the travel route without causing the towing vehicle 1 to be detached from the transport carriage 2 even when maintenance and inspection work of the battery 15 is required. Inspection work can be performed.

  Further, as described above, when each transport carriage 2 is tow-driven by the towing vehicle 1 in a continuous state in which the front and rear ends thereof are adjacent to each other on the travel route, the entire towing vehicle 1 is front and rear. It will be hidden under the transport carriage 2 adjacent to. Even in such a case, the horizontal frame members 32f and 32g and the intermediate vertical frame member of the body 2A among the cover plates 39a to 39l covering the upper surface of the preceding transport carriage 2 immediately before the front half of the towing vehicle 1 is covered. Covers a rectangular region surrounded by 33d and 33e, that is, a rectangular region located directly above the control device storage space 13 of the towing vehicle 1 located below and having a larger plane area than the control device storage space 13. By removing the cover plate 39k, the cover plates 30a and 30b covering the control device storage space 13 of the towing vehicle 1 are removed through the rectangular opening where the removal mark of the cover plate 39k is removed. Since the storage space 13 can be opened, the towing vehicle 1 remains on the travel route even when maintenance and inspection work of the control device 12 is required. Readily such as maintenance and inspection of the control device 12 can be performed.

  In addition, the connected shaft body 43 that is the fitting member on the transport carriage 2 side that constitutes the connecting means 41 of the above embodiment is replaced with a vertical shaft body 25 having a pointed end portion 25a that protrudes downward, and the towing vehicle 1 side is replaced. The vertical shaft body 25 as a fitting member can be replaced with a connected shaft body 43 provided with a connecting hole 52 opening upward. Further, in the state where the fitting member on the towing vehicle 1 side and the fitting member on the transport carriage 2 side are fitted to each other, the contact portion that regulates the fitting depth is one fitting member (vertical shaft body 25). ) And the bottom surface 52a of the connection hole 52 of the other fitting member (connected shaft body 43), for example, a small-diameter protruding shaft portion is provided on the end surface of one of the fitting members. A connecting hole for fitting the protruding shaft portion is provided on the end surface of the other fitting member, and the fitting depth between the protruding shaft portion and the connecting hole is limited by the contact between the end surfaces of the two fitting members. It can also be configured as follows. Further, the structure of the connecting means 41 in the above embodiment is turned upside down, and the fitting member on the towing vehicle 1 side is supported so as to be movable up and down with respect to the supporting member and is urged upward by a spring, and the conveying cart 2 side The position of the fitting member can be fixed.

  The trolley type transport device using the tow truck according to the present invention can transport the low floor structure transport truck for loading heavy objects with a low floor structure tow truck that enters the lower side of the transport truck. As a device, it can be used for transporting automobile bodies in automobile assembly lines.

DESCRIPTION OF SYMBOLS 1 Towing vehicle 2 Conveying cart 5 Front free wheel 6 Backward fixed wheel 7a, 7b Drive wheel 8 Free wheel 12 Control device 13 Control device storage space 15 Battery 16 Battery storage space 19a, 19b Motor with reduction gear 25 Vertical shaft for towing Body (fitting vehicle side fitting member)
25a Pointed portion 26 Mounting seat plate 27a, 27b Vertical screw hole 30a-30d, 39a-391, 54 Cover plate 38 Connection plate 40 Inter-machine cover plate 41 Connection means 42 Cylindrical support member 42a Large diameter flange portion 42b Rotation operation Square shaft portion 42c Screw shaft portion 43 Connected shaft body (fitting member on the transport carriage side)
43a Large-diameter flange portion 44 Central hole portion 44a Screw hole portion 45 Compression coil spring 46 Spring receiver 46a Square hole portion 47 Lower limit stopper 48 Tractor lifting plate 48a, 48b Through hole 49 Distance piece 50 Ascent limit stopper 51 Screw hole 52 Connection hole 52a Bottom surface 53 Operation opening 55a, 55b Bolt

Claims (6)

It consists of a self-propelled tow truck, a transport carriage with front wheels and rear wheels, and a connecting means for connecting the tow truck and the transport carriage to each other. The connecting means is attached to the tow truck and the transport carriage. A trolley-type transporting device using a tow vehicle that includes a pair of upper and lower fitting members that fit in the vertical direction, and is fitted in contact with each other in the vertical direction on the pair of upper and lower fitting members of the connecting means. An abutting portion is provided to regulate the joint depth, and one of the pair of upper and lower fitting members is supported by the support member so that it can be raised and lowered within a certain range, and the other fitting member is supported by a spring. When the pair of upper and lower fitting members that are urged toward each other and are fitted to each other are in contact with each other at the contact portion, one of the fitting members urged by the spring is applied to the support member. It is configured to move backward against the biasing force of the spring. In bogie type conveying device of the towing vehicle utilization are,
The support member is threaded through a vertical screw hole provided in the body of the transport carriage so as to be adjustable in height, and the fitting member on the transport carriage side can be raised and lowered to the central hole of the support member. And is urged downward by the spring interposed between the spring receiver on the upper end side of the central hole portion of the support member and the fitting member, and the central hole portion of the support member A trolley-type trolley-type transfer device that protrudes downward from the lower end opening and is provided with an operation opening for rotating the support member from above the transfer trolley.   2. The trolley-type carriage transport device according to claim 1, wherein the traction vehicle-side fitting member is disposed at a central position between a pair of left and right drive wheels included in the traction vehicle.   The spring includes a compression coil spring interposed between the fitting member supported by the support member so as to be movable up and down and a spring receiver provided on the support member. The trolley | bogie type trolley | bogie type conveying apparatus of Claim 1 or 2 provided so that position adjustment is possible in an axial direction. Of the pair of upper and lower fitting members, one fitting member is composed of a shaft body having a pointed end, and the other fitting member has the one fitting member relatively rotated around its vertical axis. A connecting hole for freely fitting is provided concentrically from an end surface, and the pointed end portion of one fitting member and the bottom surface of the connecting hole of the other fitting member constitute the contact portion. Item 4. A cart-type transfer device using a tow truck according to any one of Items 1 to 3. When the support member is raised to the ascending limit with respect to the body of the transport carriage, the fitting member that is lowered to the descending limit by the biasing force of the spring with respect to the supporting member is the fitting member on the towing vehicle side The trolley | bogie type trolley | bogie type conveying apparatus of any one of Claims 1-4 comprised so that it may detach | leave upward rather than . The support member is screwed into a vertical screw hole provided on the machine body side of the transport carriage so as to be screwed up and down, and screwed into the upper end side of the screw shaft portion so as to be adjustable in height. A descending limit stopper and an ascending limit stopper provided on the lower end side of the support member are provided, a rotation operation angular shaft portion is provided around the upper end of the support member, and a rotation operation unit is provided on the upper end of the spring receiver. The trolley | bogie type conveyance apparatus using a tow vehicle of Claim 5 provided with .

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