JP2008087658A - Working truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain miniaturization of a mounted motive power device by easily arranging a workbench at a position easily worked. <P>SOLUTION: The working truck 2 is provided with support frames 22, 23 provided on an under carriage 5 traveling on a track 3 by a wheel 4; an advancement/retreating mechanism 10 for adjustably projecting the support frames 22, 23 to an outer side in a left/right direction by projection hydraulic cylinders 16, 17 respectively and advancing/retreating them; workbenchs 55, 56 provided on the support frames 22, 23; and a lifting mechanism 40 for adjustably lifting height of the workbenchs 55, 56 by hydraulic cylinders 52R, 52L for lifting. The support frames 22, 23 are independently provided at both left and right sides, and the hydraulic cylinders 16, 17 for projection and the hydraulic cylinders 52R, 52L are provided on every these support frames 22, 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work carriage used when working in a tunnel with a track laid.

Generally, when performing maintenance and inspection work on the wall surface of a tunnel in which a track is laid, a work cart is pulled into the track, and an operator gets on the work table attached to the work cart to perform the work. Conventionally, a work carriage 101 as shown in FIG. 12 is known as such a work carriage. The work carriage 101 includes a base 103 placed on a carriage 102 that can run on a track, a movable part 104 that is movably stored in the base 103, and at least the base 103 or the movable part 104. On the other hand, it is provided with scaffolds 105a and 105b that are stored so as to be deployable on the side (see Patent Document 1). This work carriage 101 is composed of a first stage 106 in which the movable part 104 is telescopically stored in the base 103 from above, and a second stage 107 telescopically stored in the first stage 106 from above. Has been. In order to move the movable portion 104 up and down, a wire is passed over a pulley supported by the base portion 103 and the movable portion 104, and the wire is fed or taken up by a winch (not shown). Further, the scaffolds 105a and 105b are respectively supported by one side surface (left side surface) of the base 103 and the same side surface (left side surface) of the first stage 106 via a pair of front and rear hinges, and can be deployed laterally around the hinge. Stored. The scaffolds 105a and 105b are flipped up vertically to the side of the movable unit 104 in the retracted state, and protrude in the horizontal direction from the side surfaces of the first stage 106 of the base 103 and the movable unit 104 in the deployed state. It has become. A scaffold 105 c is also formed at the upper end of the second stage 107 of the movable portion 104.
JP 2004-42705 A (3rd page, FIG. 5)

  In the above-described conventional work cart, a work table including a base portion placed on the car stand and a movable portion stored in the base portion is provided, and the work table is moved up and down. When working, first determine the level of the workbench, then, in order to avoid interference between the scaffold and the movable part, expand both the left and right scaffolds below the movable part to be lifted, then lift and lower Yes. For this reason, there is a problem that positioning takes time and a work for deploying the scaffold is required. Also, once the movable part of the workbench is pulled up to the ascending end, in order to avoid the trouble of lowering each time depending on the work position, the worker can lift between the scaffolds with different heights while being pulled up to the ascending end. There was a problem that work efficiency was poor because the work was done back and forth. Furthermore, since the scaffold is swingably attached to the side surface of the workbench, if the scaffold is short in the left-right direction, the worker will not reach the wall surface if the track and the wall surface are separated. In this case, if the track and the wall surface are close, there is a problem that the scaffold hits the wall surface and cannot be deployed. Moreover, since it is provided only on one side surface in the traveling direction of the work carriage, it is necessary to change the traveling direction when performing maintenance and inspection work on the wall surface on the other side surface. In addition, a plurality of telescopic movable frames must be made according to the height, which causes a problem of increasing the weight and cost of the vehicle body. In addition, the progress and stop of the chassis must be carried out by getting into the driver's seat of the chassis from the work platform, and there is a problem that work efficiency is poor.

  The present invention has been made to solve the above-described problems, and has a simple structure and high work efficiency. Further, the present invention can be easily placed at a position where the work target portion can easily work with respect to the distance and height from the chassis. It is an object of the present invention to provide a work carriage that can be provided with a work table, can reduce the power required for raising and lowering, and can reduce the size of a power device to be mounted.

  According to a first aspect of the present invention, there is provided a work carriage that can be adjusted to the outside in the left-right direction by a first drive means, a chassis that travels on a track with wheels, a support frame provided on the chassis, and the support frame. It includes an advance / retreat mechanism that projects and retreats, a work table provided on the support frame, and an elevating mechanism that moves the work table up and down so that the height can be adjusted by a second driving means.

  In the work carriage according to claim 1 of the present invention, the carriage that travels on the track by the wheels, the support frame provided on the carriage, and the support frame can be adjusted to the outside in the left-right direction by the first driving means. Because it is provided with an advance / retreat mechanism that protrudes and retreats, a work table provided on the support frame, and an elevating mechanism that moves the work table up and down so that the height can be adjusted by the second drive means. At the time of work, the work table can be moved to an arbitrary arbitrary position with respect to the work target portion of the wall surface, and the work is made efficient.

  According to a second aspect of the present invention, the work cart is provided with support frames independently on both the left and right sides, and an advance / retreat mechanism is provided for each of the support frames.

  In the work cart according to the second aspect, the support frames are provided independently on both the left and right sides, and the advance / retreat mechanism is provided for each of the support frames. Therefore, the drive source of the advance / retreat mechanism and the drive source of the elevating mechanism are divided. As long as the required power is sufficient to ensure the capability according to each of the divided left and right mechanisms, it is possible to reduce the size of the mounted drive device. it can.

  According to a third aspect of the present invention, the working carriage includes a base frame provided on the carriage, and a pair of guides disposed in parallel along the left-right direction on the front and rear sides of the upper surface of the base frame in the traveling direction. A roller provided on both sides in the front-rear direction of each guide, and a U-shaped left side frame that is disposed along one side of the inner and outer sides of the guide and that moves forward and backward in the left-right direction by engaging with the roller. A U-shaped right frame which is disposed along the other side of the guide inside and outside, engages with a roller on the opposite side of the roller in the front-rear direction, and moves forward and backward outward in the left-right direction, and each of these U-shaped frames And an overhanging drive hydraulic cylinder mounted between the base frame and the base frame, and a support frame is provided on each U-shaped frame.

  In the work carriage according to claim 3, the advance / retreat mechanism includes a base frame provided on the carriage, and a pair of guides disposed in parallel along the left-right direction on the front and rear sides of the upper surface of the base frame in the traveling direction. A roller provided on both sides in the front-rear direction of each guide, and a U-shaped left side frame that is disposed along one side of the inner and outer sides of the guide and that moves forward and backward in the left-right direction by engaging with the roller. A U-shaped right frame which is disposed along the other side of the guide inside and outside, engages with a roller on the opposite side of the roller in the front-rear direction, and moves forward and backward outward in the left-right direction, and each of these U-shaped frames And an overhanging drive hydraulic cylinder mounted between the base frame and the support frame on each U-shaped frame. The character frame is guided by the guide rollers Move to the side, the extension of the piston rod is stopped, U-shaped frame is stopped at that position. For this reason, the work table can be protruded to a desired position laterally outside.

  According to a fourth aspect of the present invention, the working carriage is provided with a balance mechanism that uniformly transmits the expansion / contraction force of the piston rod of the hydraulic cylinder to both side frames of the U-shaped frame.

  In the work carriage according to claim 4, the forward / backward movement mechanism is provided with a balance mechanism that uniformly transmits the expansion / contraction force of the piston rod of the hydraulic cylinder to both side frames of the U-shaped frame. Even if it is attached at a position displaced in the front-rear direction from the center of the U-shaped frame, the force is transmitted uniformly, so that the U-shaped frame is smoothly advanced and retracted. For this reason, the freedom degree of design increases.

  In the work carriage according to claim 5, the balance mechanism is configured such that the chain is fixed to the lower surfaces of both front and rear frames of the U-shaped frame, chain wheels that are respectively engaged with the chains are provided, and the chain wheels are connected by a shaft. At the same time, this shaft is rotatably supported by the base frame.

  In the work trolley according to claim 5, the balance mechanism is configured such that chains are fixed to the lower surfaces of both front and rear frames of the U-shaped frame, chain wheels that are respectively engaged with these chains are provided, and these chain wheels are connected by a shaft. At the same time, since this shaft is rotatably supported by the base frame, when the piston rod of the hydraulic cylinder extends and the U-shaped frame moves outward, the chain wheel engaged with both chains is rotated. . Since both chain wheels are connected by a shaft, both chain wheels rotate together to guide the chains on both sides equally. For this reason, the U-shaped frame is smoothly advanced and retracted.

  In the work cart according to claim 6, the elevating mechanism is pivotally attached to one end of the upper and lower frames in which the longitudinal grooves are bored, and one upper and lower ends of one of the links in which the intersecting center is rotatably connected by a pin. Parallel motion frames with the other upper and lower ends slidably locked in the grooves of the upper and lower frames are placed on the support frame so as to face each other, and these inner links are connected to the upper part between the inner links. And a lifting hydraulic cylinder with one end rotatably attached to the connecting shaft and the other end rotatably attached to the support frame, and a work table between the upper frames. It is intended to be attached.

  In the work carriage according to claim 6, the elevating mechanism is pivotally attached to one end of the upper and lower frames in which the longitudinal grooves are formed, and one upper and lower ends of one of the links in which the intersecting center is rotatably connected by a pin. Parallel motion frames with the other upper and lower ends slidably locked in the grooves of the upper and lower frames are placed on the support frame so as to face each other, and these inner links are connected to the upper part between the inner links. And a lifting hydraulic cylinder with one end rotatably attached to the connecting shaft and the other end rotatably attached to the support frame, and a work table between the upper frames. Since the piston rod of the elevating hydraulic cylinder is extended and the connecting shaft is pushed up, both inner link pieces turn up around the fixed side and the inner and outer links are opened with the movable side displaced and opened. The frame is raised parallel to the lower frame That. When the extension of the piston rod is stopped, the workbench stops at that position. For this reason, the work table can be raised to a desired upper position and stopped.

  According to a seventh aspect of the present invention, there is provided a cantilever correction mechanism that keeps the work table horizontal between the vehicle table and the base frame.

  In the work cart according to claim 7, since a cant correction mechanism that keeps the work table horizontal is provided between the vehicle table and the base frame, even if there is a difference in height between the inner and outer rails, Kept horizontal.

  A work cart according to the present invention includes a chassis that travels on a track by wheels, a support frame provided on the chassis, and a support frame that protrudes forward and backward by a first drive means so as to be adjustable. The structure is simplified because it includes an advancing / retracting mechanism to be moved, a work table provided on the support frame, and a lifting mechanism for moving the work table up and down so that the height can be adjusted by the second driving means. Cost reduction and work efficiency can be improved.

  For the purpose of improving the usability of the work carriage and improving the work efficiency, a chassis that travels on a track by wheels, a support frame provided on the chassis, and a left and right direction of the support frame by the first drive means An advancing / retracting mechanism that protrudes outwardly to advance and retract, a work table provided on the support frame, and a lifting mechanism that moves the work table up and down so that the height can be adjusted by a second driving means This is realized by providing the support frames independently on both the left and right sides and providing an advance / retreat mechanism for each of these support frames.

  The present invention will be described below with reference to embodiments shown in the drawings. 1 to 3 are a front view, a side view, and a plan view, respectively, of a work carriage according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the work carriage 2 according to the present embodiment includes a chassis 5 having wheels 4 that travel on a track 3. A cant correction mechanism 6 is provided on the chassis 5. The cant correction mechanism 6 is configured to correct the height difference and keep the upper surface horizontal when there is a height difference between the left and right rails of the track. An advance / retreat mechanism 10 is provided on the upper surface 6A of the cant correction mechanism via an adjustment cylinder 7 that adjusts the height.

  As shown in FIGS. 4A and 4B and FIGS. 5A and 5B, the advancing / retracting mechanism 10 includes a base frame 11 mounted on the adjustment cylinder 7 and an upper surface of the base frame 11. And a pair of guides 12FW and 12RW arranged in parallel in the left-right direction on the front and rear sides in the traveling direction. Rollers 13F and 13R are provided on both sides in the front-rear direction of these guides 12FW and 12RW. A left U-shaped frame 14 is disposed along the outside of the guides 12FW and 12RW. The left U-shaped frame 14 is related to the front roller 13F of the front guide 12FW and the rear roller 13R of the rear guide 12RW. At the same time, it is moved forward and backward in the left-right direction. The right U-shaped frame 15 is disposed along the inside of the guides 12FW and 12RW, and engages with the rear roller 13R of the front guide 12FW and the front roller 13F of the rear guide 12RW, and moves forward and backward in the left-right direction. It has come to be. The left U-shaped frame 14 engages with the front roller 13F of the front guide 12FW and the rear roller 13R of the rear guide 12RW and is guided in the left-right direction (a side frame of the U-shaped frame) 14A. , 14B, and an outer frame 14C that is disposed between the left end portions of the slide frames 14A, 14B and connects the slide frames 14A, 14B. The right U-shaped frame 15 is, like the left U-shaped frame 14, engaged with the rear roller 13R of the front guide 12FW and the front roller 13F of the rear guide 12RW and guided in the left-right direction. (Side frame of U-shaped frame) 15A, 15B and an outer frame 15C that is disposed between the right end portions of the slide frames 15A, 15B and connects the slide frames 15A, 15B. Thus, the slide frames 14A and 14B are locked to the rollers 13F, 13R and 13R, 13F on the outside of the guides 12FW and 12RW, and the slide frames 15A and 15B are locked to the rollers 13F and 13RW, respectively, and do not interfere with each other. It is like that.

  Overhang driving hydraulic cylinders (first driving means) 16, 17 are attached between the outer frames 14 C, 15 C of these U-shaped frames 14, 15 and the base frame 11. Among these hydraulic cylinders 16 and 17, the hydraulic cylinder 16 on the left U-shaped frame 14 side is, as shown in FIG. The 15th hydraulic cylinder 17 is attached to the front side from the center of the base frame 11 in the front-rear direction. That is, the hydraulic cylinder 16 is shifted to the rear side from the center in the front-rear direction of the left U-shaped frame 14, and the hydraulic cylinder 17 is shifted to the front side from the center in the front-rear direction of the right U-shaped frame 15. Each can be attached. The main bodies of these hydraulic cylinders 16 and 17 are fixed to the base frame 11, and the piston rods 16A and 17A are connected to the outer frames 14C and 15C by pins 24, respectively. Reference numerals 18 and 19 are fixed frames attached to the upper surface of the base frame 11, as shown in FIG. 5, and the upper and lower fixed work tables 20 and 21 (see FIGS. 2 and 2) are mounted on the upper surfaces of the fixed frames 18 and 19, respectively. 3) is provided. Support frames 22 and 23 are attached to the left upper surface of the left U-shaped frame 14 and the right upper surface of the right U-shaped frame 15, respectively. The support frames 22 and 23 are provided with work tables 55 and 56 via an elevating mechanism 40 described later.

  The advance / retreat mechanism 10 is provided with a balance mechanism 30. The balance mechanism 30 is configured to uniformly transmit the expansion and contraction force of the piston rods 16A and 17A driven forward and backward from the hydraulic cylinders 16 and 17 provided in a biased manner to the slide frames 14A and 14B and 15A and 15B. As shown in FIG. 8, the balance mechanism 30 includes chains 32F and 32R attached to lower surfaces of pipe stays 31F and 31R provided along the outer sides of the slide frames 14A and 14B of the left U-shaped frame 14. Chain wheels 33F and 33R engaged with the chains 32F and 32R, respectively. Both the chain wheels 33F and 33R are connected to each other by a shaft 34. The shaft 34 is rotatably supported by the base frame 11. Therefore, when the piston rod 16A of the hydraulic cylinder 16 on the left U-shaped frame 14 side extends and the U-shaped frame 14 moves outward, the chain wheels 33F and 33R engaged with both the chains 32F and 32R are rotated. The Since both the chain wheels 33F and 33R are connected by the shaft 34, both the chain wheels 33F and 33R rotate integrally. For this reason, the U-shaped frame 14 is smoothly advanced and retracted even if the outer frame 14 </ b> C is cantilevered due to the biased mounting position of the hydraulic cylinder 16. The balance mechanism 30 is also provided on the right U-shaped frame 15 side. That is, as shown in FIG. 8, the chains 36F and 36R attached to the lower surfaces of the pipe stays 35F and 35R provided along the slide frames 15A and 15B inside the right U-shaped frame 15, and the respective chains 36F and 36R. Are respectively provided with chain wheels 37F and 37R. Both the chain wheels 33F and 33R are connected to a shaft 38 that is rotatably supported by the base frame 11. Thus, by providing the balance mechanism 30, even if the overhanging drive hydraulic cylinder 16 is attached to a position deviated in the front-rear direction from the center of the U-shaped frames 14, 15, the force is evenly distributed. Therefore, the U-shaped frame is smoothly advanced and retracted, and the degree of freedom in design is increased.

  As shown in FIG. 9, an elevating mechanism 40 is provided on each of the support frames 22 and 23 of the advance / retreat mechanism 10. The elevating mechanism 40 is configured by arranging a pair of parallel motion frames 50R and 50L whose left and right sides move in parallel on the support frames 22 and 23 so as to face each other. The parallel motion frame 50R includes a right upper frame 41R and a right lower frame 42R having upper and lower parallel edges 41A, 41B and 42A, 42B, respectively. The right upper frame 41R and the right lower frame 42R have parallel edges 41A, Longitudinal grooves 43, 44 parallel to 41B, 42A, 42B are drilled on the rear side. Similarly, the parallel motion frame 50L includes a left upper frame 41L and a left lower frame 42L having upper and lower parallel edges 41A, 41B and 42A, 42B, respectively. The left upper frame 41L and the left lower frame 42L have parallel edges, respectively. Longitudinal grooves 43, 44 parallel to 41A, 41B, 42A, 42B are drilled on the rear side. The left and right lower frames 42L and 42R are attached to the left and right ends of the support frames 22 and 23, respectively. A left work table 55 and a right work table 56 are attached to the left and right upper frames 41L and 41R, respectively.

  Ends 46A and 47A of links 46 and 47 that are pivotally connected to each other at the front end portions of the left and right upper frames 41L and 41R and pivoted by pins 45 are pivotally attached to the pins, respectively. The links 46 and 47 have the same length, and when rotating around the pin 45, the line connecting the lower ends 47A and 46B of the link 46 and 47 and the line connecting the both upper ends 46A and 47B always keep parallel. It is like that. An upper rod 48 is bridged between the grooves 43, 43 of the left and right upper frames 41L, 41R, and a lower rod 49 is bridged between the grooves 44, 44 of the left and right lower frames 42L, 42R. It slides within 44. The other ends 46B and 46B of the left and right outer links 46 and 46 are pivotably locked to the lower rod 49, and the other ends 47B and 47B of the left and right inner links 47 and 47 are pivotally locked to the upper rod 48, respectively. Is done. For this reason, when the left and right links 46 and 47 are interlocked and rotated around the pin 45, the left and right upper frames 41L and 41R are parallel to the left and right lower frames 42L and 42R. Keeping it displaced upwards.

  Between the left and right inner links 47, 47, a connecting shaft 51 is provided between the pin 45 and the other end 47B, and these both inner links 47, 47 are connected. Lifting hydraulic cylinders (second drive means) 52R and 52L are provided between the connecting shaft 51 and the support frames 22 and 23 side. The lifting hydraulic cylinders 52R and 52L are pivotably connected to the connecting shaft 51 at the piston rods 53L and 53R side and to the support frames 22 and 23 at the other end on the main body side. When hydraulic pressure is introduced from a hydraulic unit (not shown), the lifting hydraulic cylinders 52R and 52L push up the connecting shaft 51 to open the left and right links 46 and 47 at the same time, and the work table 55 fixed to the upper frames 41R and 41L. 56 is lifted independently for each of the support frames 22 and 23 and held at a desired height. The overhang driving hydraulic cylinders 16 and 17 and the lifting hydraulic cylinders 52R and 52L are each independently operated remotely by a remote control panel (not shown).

  The chassis 5 is provided with an automatic air brake 60 as shown in FIGS. The automatic air brake 60 includes a dolly side brake pipe (not shown) connected via a connecting hose (not shown) to a driving car side brake pipe (not shown) on a driving car (motor car) side, and an auxiliary air reservoir ( (Not shown), an electromagnetic control valve (brake valve, not shown) provided between the truck side brake pipe and the auxiliary air reservoir, and an electromagnetic control valve connected to the electromagnetic control valve. Thus, a brake cylinder 61 is provided which guides compressed air from the auxiliary air reservoir and releases braking.

  A first swing rod 63 and a second swing rod 64 are connected to the piston rods 62A and 62B of the brake cylinder 61 by pins. The other ends of the swing rods 63 and 64 are connected to a rear wheel side push rod 65 for operating the rear wheel side brake pad 66 and a front wheel side push rod 67 for operating the front wheel side brake pad 68, respectively. A connecting rod 69 is connected to the swing rods 63 and 64 between the end portions on the push rods 65 and 67 side and the brake cylinder 61. For this reason, when the compressed air is introduced into the brake cylinder 61 and the piston rods 62A and 62B project, the swing rods 63 and 64 swing about the connecting portion of the connecting rod 69, and both push rods 65 and 67 are moved. Is released, the pressure contact of each brake pad 66, 68 is released, and the braking is released.

  The second swing rod 64 is formed to be longer than the first swing rod 63, and is formed by extending the end portion 64A on the piston rod 62B side. A manual brake 70 is connected to the extended end 64A. The manual brake 70 is rotatably supported by the chassis 5 and includes an operation rod 71 having an operation handle 72 at the front end. The rear end of the operation rod 71 is threaded and screwed into the screw hole of the turnbuckle 73. The turnbuckle 73 is formed with a slit, and is connected to the extended end 64A of the second swing rod 64 by a pin through the slit. Therefore, in the manual brake 70, when the operation handle 72 is rotated, the operation rod 71 is rotated in one direction, the turnbuckle 73 moves along the threaded portion of the operation rod 71, and the second swing is performed through the pin. The collar 64 is swung and displaced to the braking position. When the operation handle 72 is rotated in the reverse direction, it returns to its original position. For this reason, when the manual brake 70 is operated and the second swing rod 64 is displaced to the braking position, the first operating rod 63 is also displaced to the braking position by the connecting rod 69, so that both the front and rear wheels 4 are in the braking state. Can be held in. Therefore, even if the electromagnetic control valve is accidentally operated during work and compressed air is introduced into the brake cylinder 61, braking is not released. For this reason, the manual brake 70 plays a role of fail-safe, and safety is improved.

  Further, as shown in FIG. 3, a generator 80 is mounted on the chassis 5. For this reason, it is not necessary to draw in the power cord from the outside, and work efficiency is improved.

  Next, the operation of the work carriage 2 according to the above embodiment will be described. When the hydraulic pressure is introduced from the outside into the projecting side chamber of one of the overhanging drive hydraulic cylinders 16 by operating a remote control panel (not shown), the work cart 2 according to the above-described embodiment causes the piston rod 16A of the overhanging drive hydraulic cylinder 16 to move. The left U-shaped frame 14 is pushed outward to the left, and the left work table 55 is moved together with the left U-shaped frame 14. When the left U-shaped frame 14 reaches a desired protruding position, the supply of hydraulic pressure to the overhang driving hydraulic cylinder 16 is stopped. Then, the left U-shaped frame 14 and the work table 55 are stopped at a desired left side protruding position. The overhang driving hydraulic cylinder 16 is attached to a position shifted from the center in the front-rear direction of the left U-shaped frame 14. For this reason, when the left U-shaped frame 14 is pushed out, even if the outer frame 14C is inclined and a speed difference occurs in either chain 32F, 32R, both chain wheels 33F, 33R are connected by the shaft 34. Since they are integrally rotated, the chains 32F and 32R are evenly guided by the chain wheels 33F and 33R. For this reason, the U-shaped frame 14 is smoothly advanced and retracted.

  When the work table 55 reaches a desired overhanging position, a remote control panel (not shown) is operated to introduce hydraulic pressure from the outside into the protruding side chambers of the lifting hydraulic cylinders 52R and 52L of the left support frame 22. When the piston rods of the elevating hydraulic cylinders 52R and 52L are extended to push up the connecting shaft 51, the elevating hydraulic cylinders 52R and 52L are also raised while pushing the left and right links 46 and 47 to be fixed to the upper frames 41R and 41L. The left work table 55 is raised. When the supply of hydraulic pressure to the lifting hydraulic cylinders 52R and 52L is stopped at a desired height, the left work table 55 is held at that height. The projecting and raising of the work table 55 may be reversed in order, or the projecting and raising may be performed simultaneously. When the hydraulic pressure is guided to the other return side chamber of each hydraulic cylinder 16, 17, 52R, 52L by operating a remote control panel (not shown), the piston rods 16A, 17A, 53R, 53L return to their original positions. The same operation as that of the left work table 55 is also performed for the right work table 56, that is, the movement of the right support frame 23 by the advance / retreat mechanism 10 and the raising / lowering operation of the right work table 56 by the lifting mechanism 40. Furthermore, the left work table 55 and the right work table 56 can be synchronized so that the same floor surface can be simultaneously held on the chassis 5 and moved up and down.

  As described above, in the work cart 2 according to the present embodiment, it is possible to work at an optimum position where the work can be performed most easily with respect to the distance from the cart and the height from the floor of the work target portion of the wall surface such as a tunnel. Work efficiency is improved. Further, the overhanging drive hydraulic cylinders 16 and 17 that are the drive sources of the advance / retreat mechanism 10 and the lift hydraulic cylinders 52R and 52L that are the drive sources of the lift mechanism 40 are divided into left and right work tables 55 and 56, respectively. The power required will be provided as long as the power required for the divided mechanisms 10 and 40 on the left and right sides is ensured. The drive device can be downsized.

It is a front view which shows the work trolley | bogie which concerns on one Example of this invention. Example 1 It is a side view of the work trolley | bogie of FIG. It is a top view of the work trolley | bogie of FIG. (A), (B) is the top view and front view which respectively show the principal part of an advance / retreat mechanism. (A), (B) is the top view and front view which respectively show the principal part of the advance / retreat mechanism before attaching a hydraulic cylinder. (A) thru | or (C) are the top view, side view, and front view which respectively show the left U-shaped frame. (A) thru | or (C) are the top view, side view, and front view which respectively show the right U-shaped frame. (A) thru | or (C) are the longitudinal cross-sectional views which respectively show the principal part of an advance / retreat mechanism. (A) thru | or (C) are the top view, side view, and front view which respectively show a raising / lowering mechanism. (A) is a top view which shows an automatic air brake and a manual brake, (B) is a side view of a manual brake, (C) is explanatory drawing which shows arrangement | positioning of a wheel and a brake. It is a conceptual diagram of an automatic air brake and a manual brake. It is explanatory drawing which shows the conventional worktable.

Explanation of symbols

2 Working cart 4 Wheel 3 Track 5 Chassis 10 Advancing / retracting mechanism 16, 17 Overhang hydraulic cylinder (drive means)
22, 23 Support frame 40 Elevating mechanism 55, 56 Work table

Claims (7)

  A chassis that travels on a track by wheels, a support frame provided on the chassis, an advancing / retreating mechanism that causes the support frame to be protruded outwardly in the left-right direction by a first driving means, and a support A work cart comprising a work table provided on a frame and an elevating mechanism for moving the work table up and down so that the height of the work table can be adjusted by a second driving means.   2. The work cart according to claim 1, wherein support frames are provided independently on the left and right sides, and an advance / retreat mechanism is provided for each of the support frames.   The advancing / retracting mechanism includes a base frame provided on the chassis, a pair of guides arranged in parallel in the left-right direction on the front and rear sides of the upper surface of the base frame, and both sides of each guide in the front-rear direction. A provided roller, a U-shaped left-side frame that is disposed along one of the inner and outer sides of the guide and that moves forward and backward in the left-right direction by engaging with the roller, and the other of the inner and outer sides of the guide A U-shaped right frame that is disposed along the side and engages with a roller on the opposite side of the roller in the front-rear direction and is moved back and forth in the left-right direction, and is attached between each U-shaped frame and the base frame. The working carriage according to claim 2, wherein the working carriage is provided with a protruding drive hydraulic cylinder, and a support frame is provided on each U-shaped frame.   4. The work carriage according to claim 3, wherein the advance / retreat mechanism is provided with a balance mechanism that uniformly transmits the expansion / contraction force of the piston rod of the hydraulic cylinder to both side frames of the U-shaped frame.   The balance mechanism has a chain fixed to the bottom of both front and rear side frames of the U-shaped frame, chain wheels that engage with each of these chains, and connects these chain wheels with shafts. The work cart according to claim 4, wherein the work cart is movably supported.   The elevating mechanism is pivotally attached to one end of an upper and lower frame in which a longitudinal groove is perforated, with the upper and lower ends of one of the links whose pivot centers are pivotally connected by pins, and the upper and lower ends of the other are vertically A parallel motion frame that is slidably locked in each groove of the frame is arranged on the support frame so as to face each other, and a connecting shaft for connecting these inner links is arranged at the upper part between both inner links, and one end A lifting hydraulic cylinder having the other end rotatably attached to the support frame side is arranged on the connecting shaft, and a work table is attached between the upper frames. 3. The work cart according to 3.   The work cart according to claim 1, wherein a cant correction mechanism that keeps the work table horizontal is provided between the chassis and the base frame.

Images