JP2001280047A - Mobile working stand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile working stand which can be easily and rapidly moved, and dispense with any switching operation of the braking condition. SOLUTION: This mobile working stand comprises a moving means which supports a stairway-like elevating/lowering means 2 having a plurality of stairway-like stepping portions 5 so as to change the working height, and has at least three wheels to move the elevating/lowering means, and a driving means 3 to drive predetermined wheels 11, 11 among the at least three wheels, and an operation end 13A to switch the driving means 3 to the drive condition and the stop condition is provided above the moving means 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to efficiently perform various operations at high places, for example, installation and replacement of lighting fixtures near a ceiling, installation and replacement of ceiling panels, installation of channel members, and installation of metal fittings. The present invention relates to a mobile worktable configured to perform well.

[0002]

2. Description of the Related Art The above-mentioned movable worktable is constructed such that, after the work at that position is completed on the worktable, the work is moved to the next position while being carried on the worktable to perform the work. It is configured so as to be able to improve efficiency.

[0003] Specifically, a running stepladder disclosed in JP-A-6-288168 is cited. This is 4 of the stepladder
A traveling pipe for attaching a caster to the lower end of the leg and pushing the floor surface from an oblique direction, a traveling handle for pushing the traveling pipe, a rudder linked with the caster, and a brake rod for stopping the rotation of the caster The step handle is pushed obliquely downward so that the stepladder can be moved (moved), and the traveling direction can be changed by the rudder. After running (moving), the stepladder can be fixed at that position by the brake rod.

[0004]

The running stepladder having the above-described structure is used to travel (move) using manual force, and therefore, the work is repeatedly performed (moved) many times. In addition to such inconveniences, it is difficult to make a small movement to position it at a predetermined position, and it often overruns. There was also a disadvantage that it took much time. Further, before and after the movement, the control rod must be switched to the brake release state and the brake state, respectively, and not only is the operation troublesome, but also forgets to switch to the brake state after the movement, The stepladder sometimes moved unexpectedly, leaving room for improvement.

The present invention has been made in view of the above situation, and has as its object to provide a movable workbench that can be easily and quickly moved and that does not require a switching operation of a braking state. It is in.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention supports a step-type elevating means provided with a plurality of footrests in a stepped manner so that the working height can be changed. A moving unit having three or more wheels for moving, a driving unit for driving a specific wheel among the three or more wheels is provided, and the driving unit is switched between a driving state and a driving stop state. An operation end for performing the operation is set above the moving means to constitute a movable work table. Therefore, after performing a work in a working posture in which the foot is put on the footrest of the stair-type elevating means, the specific wheel is driven by operating the operating end of the driving means in the working posture and switching to a driving state. The movable worktable can be moved to a desired position. Then, after the movement, the driving means is switched to the driving stop state, so that unless the external force enough to drive the driving means acts on the movable worktable, the movable worktable unexpectedly moves. There is no.

[0007] Since the connecting means for connecting and disconnecting the driving means and the driving wheel driven by the driving means is provided, the connection between the driving means and the driving wheels is cut off when, for example, a movable workbench is stored. Thus, the movable workbench can be moved manually.

[0008] By arranging the driving means to be driven by using the rotational force of an electric driver, not only there is no need to provide a special driving means such as an electric motor, but also there is a possibility that the driving means is particularly used for work. The use of an electric screwdriver that is familiar to a high worker enables easy and quick movement.

[0009] The step-type elevating means is a stepladder, and the operation end is set at least above an intermediate portion in the vertical direction of the stepladder. When the stair-type elevating means is constituted by a stepladder as described above, it is not necessary to specially manufacture the stair-type elevating means. In addition, by setting the operation end at least above the middle portion in the vertical direction of the stepladder, it becomes possible to operate the operation end even when any step portion of the stepladder is put on the foot.

The moving means is constituted by a truck having a pair of left and right wheels in front and rear, and a carrier having a mounting surface on which the four wheels are mounted on a lower surface and on which a load can be mounted. In such a case, there is no need to specially make the moving means.

A holding portion for locking and holding the lower ends of the four leg portions of the stepladder is formed on the mounting surface of the bogie, and the left and right width of each holding portion is made larger than the left and right width of the leg portion of the specific stepladder. Large dimensions are set. By releasing the lower ends of the four leg portions of the stepladder from the holding and separating the stepladder and the cart as described above, they can be used alone. or,
The external dimensions of the leg of the stepladder do not become extremely large compared to the size of the stepladder, the length of the footrest of the stepladder becomes longer, and the width of the left and right legs supporting the footrest is large. As described above, by setting the left and right widths of the holding portions to be larger than the left and right widths of the leg portions of the specified stepladder (the smallest left and right width among the required stepladders) as described above, Regardless of the size, the carriage can be locked and held. The angle at which the legs open when the stepladder is used depends on the size of the stepladder.
If the lower ends of the two legs are locked and held, the angle of the stepladder is not changed, and the leg can be used favorably. In other words, the existing stepladder can be used as it is on a bogie without any improvement (remodeling).

By forming the holding portion with a concave portion, the structure is simplified as compared with the case where a special locking mechanism or the like is provided.

The operation end can be fixed to a predetermined position by attaching the operation end to the stepladder with a fixture.

The driving means includes an electric driver, a wire cable for transmitting the rotational force of the electric driver, a worm gear to which the rotational force of the wire cable is transmitted, and a drive gear for driving the drive wheels by meshing with the worm gear. And a gear for driving and rotating the shaft. Since the wire can be bent by using the wire cable as described above, the disposition path from the worm gear to the tip end of the rotating wire can be freely set. In the case where a straight rod is used instead of a wire, a special mechanism such as a gear mechanism for adjusting the transmission angle of the rotational force to the worm gear is additionally required.

The connecting and disconnecting means includes a gear case in which the worm gear and the gear are housed and which is provided so as to be movable in the direction of the axle axis of the drive wheel, and protrudes from both ends of the gear case in a state of being integrally rotated with the gear. A tubular member provided, an engaged portion provided on the tubular member, and the axle capable of being engaged and disengaged by moving the gear case relative to the engaged portion in the axle axis direction. And the engaging portion provided in the above. By simply moving the gear case in the axle axis direction as described above, the engaged portion of the tubular member and the engaging portion of the axle can be engaged and disengaged. Become useless. In addition, by releasing the connection between the pair of drive wheels, both drive wheels can be made free, so that traveling while changing the direction of rotation (turning) traveling of the movable worktable is enabled.

The intermittent means is operated to switch between a meshing state in which the worm gear and the gear are meshed and a meshing released state in which the meshing state of both gears is released,
A switching operation between an engagement state in which the axle of the other drive wheel is engaged with the axle of the other drive wheel provided in the gear in an integrally rotating state and an engagement release state in which the engagement is released. The operation unit for performing the switching operation is provided in a state protruding upward. The operation part protruding upward is easy to operate, and the axles can be engaged and disengaged simply by operating the operation part.
Also, by releasing the connection between the pair of drive wheels as described above, both drive wheels can be made free, so that traveling while changing the direction such as rotation (turning) traveling of the movable worktable becomes possible. I do.

[0017]

FIG. 1 shows a mobile workbench. This movable worktable includes a carriage 1 as a moving means, a stepladder 2 as a stair-type elevating means mounted and supported on the carriage, and a driving means 3 for driving the carriage 1 so as to be able to move on its own. It is configured. Here, there is an advantage that the number of manufacturing steps can be reduced by configuring the mobile worktable using a general cart 1 and a stepladder 2 that are commercially available, but a dedicated mobile worktable is provided. May be configured. Actually, the stepladder 2 is used without modification (improvement), but is used as it is, and only the carriage 1 is modified (improved). In addition, instead of stepladder 2, a ladder is fixed diagonally on a trolley to constitute a movable worktable, or, for example, wheels are directly attached to the lower ends of four legs of stepladder 2 without using a trolley. The configuration of the movable workbench can be freely changed.

The stepladder 2 is composed of a pair of left and right square members 4 and 4, and a plurality (4 in FIG.
Ladder-shaped pair of footrests 5 is connected to each other at the upper ends thereof so as to form an eight-shape. It is configured so that the object can be switched between a non-use posture in which the objects are closed to each other and a use posture (eight-shaped) in which the legs are opened at a specific angle. Reference numeral 6 denotes a cylindrical portion for holding a distal end portion of a wire cable 13 described later, that is, the driving unit 3.
Is a support bracket as a fixture for fixing the operation end 13A for operating the step above the middle part in the vertical direction of the stepladder 2. The support bracket 6 is externally fitted and fixed to the cylindrical portion 13A. The outer cylindrical portion 13B is fixed by welding or the like. The position of the operation end 13A is set to be approximately 2/3 of the height of the stepladder 2, but by setting the position above the middle part in the vertical direction (a half part),
The operating end 1 can be used with any footrest 5 of the stepladder 2
3A has an advantage that the tip of the electric screwdriver 12 described later can be easily locked, but any position may be set as long as it is above the driving means 3. Numeral 7 is a hook for suspending and supporting a tool such as an electric screwdriver 12 to be described later, and for holding and holding a bag housing a large number of fluorescent lamps, for example. By configuring the movable workbench using the stepladder 2, both feet can be hung on the footrests 5, 5 located on both sides of the upper end of the stepladder 2 as compared with a single ladder. This has the advantage that work can be performed stably.

The carriage 1 has a mounting portion 8 for mounting and supporting the stepladder 2 having a substantially rectangular shape in plan view, and the mounting portion 8.
The supporting pipe 9 for hand pushing (which may not be provided) is foldably attached to the mounting surface 8A of the vehicle, and the wheels 10 and 10 (only one in FIG. (Not shown), 11, 11 (three or five or more) and these wheels 10, 10, 11, 11
And a drive means 3 for driving a pair of left and right wheels 11, 11 (hereinafter, referred to as drive wheels) located at one end in a longitudinal direction (hereinafter, referred to as front-rear direction) of the truck. . At the four corners of the placing surface 8A, concave portions 8a are formed as holding portions for locking and holding the lower ends of the legs 4, 4, 4, and 4 of the stepladder 2. And the recess 8
The left and right width of a is set to be larger than the left and right width of the leg 4 of the stepladder 2 entering the recess 8a, and the stepladder larger than the stepladder 2 shown in FIG. Even if the stepladder has a large interval, the lower end of the leg can be locked and held in the recess 8a. Therefore,
Not only can the stepladder be changed to a different size due to a difference in the height of the ceiling or the like, but also the stepladder 2 can be easily and quickly separated from the bogie 1 when the place of use is moved or when not in use. .

As shown in FIGS. 1 to 3, the driving means 3
To the electric screwdriver 12, a wire cable 13 for transmitting the torque of the electric screwdriver 12, and the worm gear 1 to which the torque of the wire cable 13 is transmitted.
4 and a gear 15 that meshes with the worm gear 14 to drive and rotate the drive wheels 11, 11, and the tip of the wire cable 13 on the torque input side is attached to the support bracket 6 attached to the upper part of the stepladder 2. Since the support means is supported, the drive means 3 can be easily switched between the drive state and the drive stop state in a working posture in which the foot rests on the footrest portion 5 of the stepladder 2. Specifically, as shown in FIG.
In other words, a hexagonal shape (a cross-shaped or minus-shaped groove, etc., is changed according to the shape and size of the tip of the electric screwdriver, etc.) on the inner surface of the rotating portion 13C having the inner fitting cylinder portion rotatably fitted inside the cylindrical portion 13A. Is formed, and the hexagonal tip 12A of the electric driver 12 is engaged with the engaged portion 13D.
Is driven forward or reverse to drive wheels 11,
The movable worktable can be moved forward or backward by rotating the movable worktable 11 forward or backward. A wire 13E of the wire cable 13 is connected to a lower end of the engaged portion 13D, and a support pipe 29 to be described later is connected to a lower end of the wire 13E.
Is connected to a hexagonal rotating shaft 13G to be interpolated.
The rotating shaft 13G and a rotating shaft 17 to be described later are interlocked so as to rotate integrally. 13F shown in FIG.
29A is a coating for covering the wire 13E,
Cap 29 screwed to the upper end of support pipe 29 described later
A. In order to move the movable worktable forward or backward, the tip of the electric screwdriver 12 must be
Although it is necessary to rotate the electric screwdriver 12 forward or reverse after engaging the 3D, when the driving is stopped, the tip of the electric screwdriver 12 is detached from the engaged portion 13D. In this case, it is possible to prevent the occurrence of a trouble in which the movable work table is accidentally moved by activating the electric screwdriver 12 by mistake, but a holder for holding the electric screwdriver 12 in the always engaged state is provided. If it is carried out, it is unnecessary to perform the above-mentioned engagement at the time of movement. Further, by using the existing electric driver 12 as a power source, there is an advantage that it is not necessary to provide a special power source. However, the driving means 3 is driven by another dedicated power source. Alternatively, an electric motor may be attached to the carriage 1, a transmission mechanism such as a gear type or a chain type for transmitting the power of the electric motor to the driving wheels 11, 11 may be provided, and the electric motor may be turned on. An operation switch for turning OFF may be provided on the upper part of the stepladder 2, and may be implemented.
The specific configuration for driving the drive wheels 11, 11 is not limited to these.

The driving means 3 and the driving wheels 11, 11
An intermittent means for intermittently connecting the worm gear 14 and the gear 15 is provided using a space formed on the lower surface of the bogie 1. Upper and lower side plates 18 and 18 rotatably penetratingly support upper and lower ends of a rotating shaft 17 to which the worm gear 14 is rotatably connected integrally with the wire cable 13, and the gear 15 is externally fitted. Left and right side plates 21, 2 through which bearings 22 support cylindrical members 19, 20 slidably fitted to axles 23, 24 of left and right wheels 11, 11.
And pins 25 and 26 as engaging portions are penetrated through the axles 23 and 24, and engage the pins 25 and 26 to reduce the rotational force of the worm gear 14 to the axles 23 and 24.
Vertical grooves 27, 28 are formed in the tubular members 19, 20 as engaged portions for transmitting the force to the tubular members 19, 20 to constitute the intermittent means. Since the one cylindrical member 19 has a configuration in which the pin 25 cannot be disengaged (separated) from the cylindrical member 19 with the sliding thereof, the engagement with the pin 25 is released with the sliding. A space K is formed in the inside so that the engagement with the pin 25 can be released. Therefore, the gear case 16 is slid from the position shown in FIG. 2A in one of the axle axis directions (left and right directions), that is, in the direction of the arrow (the left side in the figure), whereby the gear case 16 shown in FIG.
As shown in (b), the engagement between the pins 25, 26 and the vertical grooves 27, 28 is released so that the wheels 11, 11 can be in a free state. By setting the wheels 11 and 11 in a free state in this way, the carriage 1 can be smoothly moved by manual pushing. When the wheels 11, 11 are driven and rotated by the rotational force of the worm gear 14 from the free state, the gear case 16 is slid in the opposite direction (right side in the figure) to the pins 25, 26 so that The vertical grooves 27 and 28 are engaged. At the upper end of the gear case 16, a lower end of a support pipe 29 (the gear case 16 may be slid in the left-right direction while holding the upper end of the pipe) is fixed. 29
And a long hole 30 extending in the left-right direction for allowing the gear case 16 to slide.
Is formed. The mounting portion 8 includes an upper plate portion 31 with four corners cut out to form the concave portion 8a, a lower plate portion 32 disposed below the upper plate portion 31, And a frame portion 33 for supporting the plate portions 31 and 32. The frame portion 33 is formed in an annular shape and abuts on a horizontal plate portion that receives a lower surface of an outer peripheral edge of the lower plate portion 32 and an outer peripheral surface of the both plate portions 31 and 32.
Further, the upper plate portion 31 is configured to have an L-shaped cross section including a vertical plate portion set at a position higher than the upper surface of the upper plate portion 31.

FIG. 8 schematically shows the relationship between the intermittent means and the drive wheels 11, 11. That is, by interposing the intermittent means D between the driving means 3 and the axles 23 and 24, it is possible to switch between a state in which the power from the driving means 3 is transmitted to the axles 23 and 24 and a state in which the power is not transmitted. ing. The intermittent means D may be switched by a manual operation force or may be automatically switched by an electric force. Also, the two axles 2
By configuring the connecting / disconnecting means D so that the rotating units 3 and 24 are in a free rotation state, there is an advantage that it is possible to configure a movable worktable capable of performing a turning operation with different left and right rotation speeds. The connection between the drive wheels 11 and 11 and the drive means 3 may be simply made without interrupting the connection between the drive wheels 11 and 11.

The intermittent means is constituted by engaging and disengaging the pins 25 and 26 with the longitudinal grooves 27 and 28, and as shown in FIGS. 7 (a), 7 (b) and 7 (c). Engaged portions 34 and 35 formed in a part of the inner surface of the tubular member 19 to have a dodecagonal cross section, and attached to the axles 23 and 24 to engage with the engaged portions 34 and 35. The connecting and disconnecting means may be constituted by nuts 36 and 37 having a hexagonal cross section as engaging portions. This configuration not only has an advantage that the nuts 36 and 37 can be immediately engaged by rotation of 30 degrees or less when they are engaged, but also has an advantage that the pins 25 can be engaged at six locations. , 26, the strength at the engagement portion during power transmission can be increased.

Further, the intermittent means is provided in each of FIGS.
(B) and as shown in FIGS. 6 (a) and 6 (b). That is, a cylindrical case body 38 that rotatably houses and supports the worm gear 14 and is movably attached to the mounting portion 8 only in the front-rear direction via a long hole (not shown) in the front-rear direction. The gear 15 that meshes with the worm gear 14 exposed through an opening 38A formed on the lower side surface of the case body 38, and a cross section formed on the inner surface of one end opening of one cylindrical axle 23 that rotates integrally with the gear 15. The engaged portion 39 having a hexagonal shape and the engaged portion 3
9 and an engaging portion 40 made of a hexagonal nut slidably fitted to the other axle 24 to transmit power to the other axle 24; Operating means 41 for sliding operation in the direction and moving the case body 38 in the front-rear direction.
The one axle 24 is formed in a rod shape penetrating the left and right drive wheels 11, 11, and the left end of the axle 24 is integrally connected to the left drive wheel 11 in the drawing, and the right end is the right drive wheel. It is loosely fitted to the wheel 11 so as to be relatively rotatable. Further, the other axle 23 includes a fitting portion 23A having the engaged portion 39 formed on the inner surface thereof, and a fitting portion 23A.
A small-diameter cylindrical portion 23B extending from A to the right driving wheel 11 side, and the gear 15 is externally fitted in an integrally rotating state.
And a connecting portion 23C extending from the cylindrical portion 23B to the right driving wheel 11 and connected to the right driving wheel 11 in an integrally rotating state, and the one axle 24 is connected to the other axle. 23 is loosely fitted and supported so as to be relatively rotatable.
The operating means 41 includes a horizontal fixed plate 43 welded to the inner surface of the wheel supporting bracket attached to the lower surface of the mounting portion 8, and a vertical (up and down) vertical corner at the rear corner of the fixed plate 43. Oscillating plate 44 slidably mounted around axis X
An intermediate arm 45 having one end pivotally connected to the front side of the swing plate 44; and a lower end pivotally connected to the other end of the intermediate arm 45 for pushing and pulling the intermediate arm 45.
In addition, an operation lever 46 as an operation unit having an intermediate portion pivotally attached around the horizontal axis Y in a state where the upper end protrudes above the mounting portion 8, and the upper end of the mounting portion 8. A support arm 47 pivotally supported on the lower surface of the armature and having a lower end pivotally supported by the engaging portion 40; and a connection arm 48 for connecting the front and rear intermediate portion of the rocking plate 44 to the support arm 47. are doing. The case body 38 is locked and held in a front-rear cutout 43A formed in the fixed plate 43 and a left-right cutout 44A formed in the swing plate 44. Therefore, by tilting the operation lever 46 in the direction of the arrow (right side in the figure) from the vertical posture shown in FIG. 5A, the swing plate 44 swings as shown in FIG. 3
8 is separated from the gear 14 to release the engagement, and the engaging portion 40 is separated from the engaged portion 39 to release the engagement, so that the two drive wheels 11, 11 are in a free state as described above. I can do it.

[0025]

According to the present invention, a driving means for driving a specific wheel is provided, and an operation end for switching the driving means between a driving state and a driving stop state is set above the moving means. After performing the work in the working posture in which the foot is put on the footrest of the stair type elevating means, the driving means is switched to the driving state in the working posture to drive a specific wheel, and the mobile work is performed to a desired position. The platform can be moved as desired without overrun or the like, and not only can the operation of the conventional braking means be unnecessary, but also a moving type which is advantageous in terms of use that can be easily and quickly moved. A workbench can be provided.

According to the second aspect of the present invention, since the intermittent means for intermittently connecting the driving means and the driving wheel driven by the driving means is provided, for example, when the movable workbench is stored, the driving means and the driving wheel are provided. By breaking the connection with, the mobile worktable can be moved smoothly by hand,
It can be more advantageous in terms of use.

According to the third aspect of the present invention, the driving means is configured to be driven by using the rotational force of the electric driver, so that it is not necessary to provide a special driving means such as an electric motor. By using an electric screwdriver that is familiar to a worker who is likely to use the work, quick and easy movement is possible, which is advantageous in both cost and operation.

According to the fourth aspect, when the stair type elevating means is constituted by a stepladder, it is not necessary to specially manufacture the stair type elevating means, which is advantageous in terms of manufacturing cost.
In addition, by setting the operation end at least above the middle portion in the vertical direction of the stepladder, the operation end can be operated even when any footrest portion of the stepladder is put on the footrest, thereby making it easy to use mobile work. Can be a stand.

According to the fifth aspect, the moving means is provided with a pair of left and right wheels in front and back, and a carrier having a mounting surface on which the four wheels are mounted on the lower surface and on which a load can be mounted. In the case of using a trolley, there is no need to manufacture the moving means from scratch, which is advantageous in terms of manufacturing cost.

According to the sixth aspect of the present invention, recesses are formed on the mounting surface of the bogie to hold and hold the lower ends of the four legs of the stepladder, and the left and right widths of the respective recesses are set to the left and right of the leg of the specific stepladder. By setting the dimension larger than the width, the lower ends of the four leg portions of the stepladder can be unlocked from the concave portions and the stepladder and the bogie can be separated, so that they can be used alone,
In addition, regardless of the size of the stepladder, it can be locked and held by the cart, which is advantageous in terms of use and can reduce the cost by using the cart in common.

According to the seventh aspect, by forming the holding portion with the concave portion, the structure is simplified as compared with the case where a special locking mechanism or the like is provided, and it is advantageous in terms of both manufacturing cost and durability. Become.

According to the eighth aspect, the operation end can be fixed to a predetermined position by attaching the operation end to the stepladder with the attachment, thereby improving operability.

According to the ninth aspect, the driving means includes a wire cable for transmitting the rotational force of the electric driver, a worm gear to which the rotational force of the wire cable is transmitted, and driving of the driving wheel by meshing with the worm gear. Since the wire can be bent by comprising the gear for driving and rotating the shaft, the arrangement path from the worm gear to the tip of the rotating wire can be set freely, which is advantageous in design freedom. Not only that, when a straight rod is used instead of a wire, a special mechanism such as a gear mechanism for adjusting the transmission angle of the rotational force to the worm gear is required, which is advantageous in terms of cost. .

According to the tenth aspect, the engaged portion of the tubular member and the engaging portion of the axle can be engaged and disengaged only by moving the gear case in the axle axis direction. This eliminates the need for a special operation mechanism or the like, which is advantageous in terms of cost due to the reduction in assembly and the number of parts. Also, by releasing the connection between the pair of drive wheels, both drive wheels can be made free, so that the mobile worktable can travel while changing its direction such as rotation (turning) travel, and can be used as a bogie. There is no functional degradation.

According to the eleventh aspect, the axles can be engaged and disengaged only by operating the operation section from above, and the operability can be improved. In addition, by releasing the connection between the pair of drive wheels as described above, both drive wheels can be made free, so that traveling while changing the direction such as rotation (turning) traveling of the movable worktable is enabled. There is no functional deterioration as a truck.

[Brief description of the drawings]

FIG. 1 is a perspective view of a movable worktable.

FIGS. 2A and 2B show the structure of an intermittent means for intermittently connecting a driving means and a driving wheel, wherein FIG. 2A shows an on state and FIG.

FIG. 3 is a perspective view of a gear case.

FIG. 4 is a perspective view showing another structure of the connecting and disconnecting means for connecting and disconnecting the driving means and the driving wheel.

5 shows a longitudinal sectional view of the intermittent means of FIG. 4 as viewed from the rear, where (a) shows an on state and (b) shows a off state.

6 shows a cross-sectional plan view of the intermittent means of FIG. 5 as viewed from above, where (a) shows an on state and (b) shows a off state.

FIGS. 7A and 7B show another structure of the connecting and disconnecting means for connecting and disconnecting the driving means and the driving wheel, wherein FIG. 7A is a rear view, FIG. 7B is a perspective view of an engaging portion, and FIG. It is a longitudinal cross-sectional view of a joining part.

FIG. 8 is a block diagram showing a configuration of the present invention.

FIG. 9 is a partially omitted view showing a specific configuration of the wire cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dolly (moving means) 2 Stepladder (stair-type elevating means) 3 Driving means 4 Leg part 5 Footrest part 6 Support bracket 7 Hook 8 Placement part 8A Placement surface 8a Depression (holding part) 9 Support pipe 10, 11 Wheel 12 Electric screwdriver 12A Tip 13 Wire cable 13A Operating end (cylindrical part) 13B Outer cylindrical part 13C Rotating part 13D Engaged part 13E Wire 13F Coating 13G Rotating shaft 14 Worm gear 15 Gear 16 Gear case 17 Rotating shaft 18 Side plate 19,20 Cylindrical Member 21 Side plate 22 Bearing 23,24 Axle 23A Fitting part 23B Tube part 23C Connection part 25,26 Pin (engagement part) 27,28 Vertical groove (engagement part) 29 Support pipe 29A Cap 30 Long hole 31 Upper plate part 32 Lower plate part 33 Frame part 34,35 Engaged part 36,37 Nut (engagement part) 38 Case 39 Engaged part 40 Engagement part 41 Operating means 42 Bracket 43 Fixing plate 44 Swing plate 43A, 44A Notch 45 Intermediate arm 46 Operation lever (operation part) 47 Support arm 48 Connecting arm Disconnecting means K space X ordinate axis Y horizontal axis

Continuation of the front page F term (reference) 2E003 CC01 2E044 AA06 BA05 BB02 BC09 CA01 CB03 DA04 EA04

Claims (11)

[Claims] 1. A moving means provided with three or more wheels for supporting and moving a step-type elevating means having a plurality of footrests in a stepped manner so as to be able to change a working height, A driving unit for driving a specific wheel of the three or more wheels is provided, and an operation end for switching the driving unit between a driving state and a driving stop state is set above the moving unit. Characterized mobile workbench. 2. The movable workbench according to claim 1, further comprising intermittent means for intermittently connecting said driving means and said driving wheel driven by said driving means. 3. The movable workbench according to claim 1, wherein said driving means is configured to be driven by using a rotational force of an electric screwdriver. 4. The movable workbench according to claim 1, wherein said step-type lifting means is a stepladder, and said operating end is set at least above a vertically intermediate portion of said stepladder. 5. A truck comprising a pair of left and right wheels in front and rear, and a carrier having a mounting surface on which the four wheels are mounted on a lower surface and on which a load can be mounted. The mobile workbench according to claim 1. 6. A holding portion for locking and holding the lower ends of the four leg portions of the stepladder on the mounting surface of the carriage, and the left and right widths of the holding portions are set to the left and right widths of the leg portions of the specific stepladder. 6. The movable worktable according to claim 4, wherein the size is set to be larger than that. 7. The movable workbench according to claim 6, wherein said holding portion is a concave portion. 8. The movable workbench according to claim 1, wherein the operation end is attached to the stepladder by a fixture. 9. An electric driver, a wire cable for transmitting the rotational force of the electric driver, a worm gear for transmitting the rotational force of the wire cable, and the driving wheel being engaged with the worm gear. 2. The movable workbench according to claim 1, further comprising a gear for drivingly rotating said drive shaft. 10. The intermittent means includes a gear case in which the worm gear and the gear are housed and which is provided so as to be movable in the axle axis direction of a drive wheel, and is integrally rotated with the gear from both ends of the gear case. Each of the projecting tubular members, the engaged portion provided on the tubular member, and the engagement and disengagement made possible by moving the gear case in the axle axis direction with respect to the engaged portion. 10. The movable workbench according to claim 2, further comprising an engaging portion provided on the axle. 11. The intermittent means is operated to switch between a meshing state in which the worm gear and the gear are meshed and a meshing release state in which the meshing state of both gears is released, and is provided integrally with the gear. A switching operation between an engagement state in which the axle of the one drive wheel is engaged with the axle of the other drive wheel and a disengagement state in which the engagement is released. 10. The movable workbench according to claim 2, wherein the operation unit is provided so as to protrude upward.