JPH0310775A - Centering device for elevating bench - Google Patents

Abstract

PURPOSE:To perform vertical and horizontal centering of a work support rest only through a pair of nipping bodies by a method wherein a cam surface for centering a bench to guide a part to be nipped to a centering position in a direction, extending at right angles with a nipping body moving direction, when the two nipping bodies are moved to approach each other is formed to each of two nipping bodies. CONSTITUTION:With an elevating table 4 lowered, a pair of nipping bodies 30a and 30b supported to the elevating label 4 are moved for approaching each other by means of a cam 31 for centering a nipping body and cam driven parts 40a and 40b. A part 33 to be nipped on the bench 7 side is guided to a centering position in the moving direction of the nipping body. Simultaneously, the part 33 to be nipped is guided to a centering position in a direction, extending at right angles with the moving direction of the nipping body, by means of cam surfaces 36a and 36b for centering a bench of the two nipping bodies 30a and 30b. This constitution centers and secures the bench 7, having the part 33 to be nipped, in centering positions in two directions of a horizontal and a vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a centering device for a workbench that is movable up and down and slidable in any direction, front, back, left, or right.

(Prior art and its problems) This type of elevating workbench supports a slider on an elevating table that can be raised and lowered relative to the base, and a slider is placed on the slider at right angles to the sliding direction of the slider. This device is equipped with a workbench that can be slid in the direction in which the engine is mounted, and is used as a table lifter to support the engine, etc., when lifting and assembling the engine, etc. from below to a car body suspended from a trolley conveyor, for example. It is.

That is, since the workbench can be slid in any direction forward, backward, leftward, and rightward with respect to the lifting table, the workpiece supported on the workbench and lifted to a predetermined level can be freely adjusted in the forward, backward, leftward, and rightward directions. However, in order to be able to safely load the workpiece onto the workbench, or to be able to safely transport the workpiece when this elevating workbench is installed on a transport vehicle. Therefore, it is necessary to configure the workbench so that it is automatically centered when the workbench is lowered to the lowering limit position.

A conventional centering device for this kind of lifting workbench includes a first centering mechanism that centers the slide table with respect to the lift table, and a second centering mechanism that centers the worktable with respect to the slide table. Not only is the structure complicated, but centering mechanisms are provided on one side of the workbench in the front and rear directions, and on the other side of the workbench, so the work space around the workbench becomes narrow and work efficiency is reduced. There were some drawbacks as well.

(Means for Solving the Problems) In order to solve the conventional problems as described above, the present invention has the following features:
In an elevating work platform, a slide table is supported on an elevating table that can be raised and lowered relative to a base, and a work table that can be slid in a direction perpendicular to the sliding direction of the slide table is provided on this slide table. , a pair of clamping bodies movable toward and away from each other in the horizontal direction are supported on the lifting platform, and a clamped part located between the clamping bodies is connected to the worktable, and when the lifting platform is lowered, the A clamping body centering cam is provided on the base to move the clamping bodies in a direction in which the clamping bodies approach each other via cam driven parts provided on each clamping body, The present invention proposes a centering device for an elevating workbench, which is provided with workbench centering cam surfaces that guide the held part to a centering position in a direction perpendicular to the direction of movement of the clamping body when moving.

(Function of the invention) When the elevator platform is raised, the slide platform can be slid in the front-rear direction or left-right direction with respect to the elevator platform, and the slide platform can be slid in the left-right direction or front-rear direction with respect to the slide platform. In combination with the movement of the workbench, the workbench can be slid in any direction forward, backward, left or right.

When the lifting platform is lowered, the pair of clamping bodies supported by the lifting platform move closer to each other by the clamping body centering cam and the cam driven section, and the clamping body moves the clamped part on the workbench side. At the same time, the work platform centering cam surfaces of both clamping bodies guide the clamped part to a centering position in a direction perpendicular to the direction of movement of the clamping bodies, for example, in the front-rear direction. Therefore, the workbench having the pinched portion is centered and fixed at the centering position in both the front, rear, left, and right directions.

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In FIGS. 1 and 2, l is a trolley serving as a base, and the bottom part is equipped with flexible wheels 2 that move around on the floor, and as shown in FIG. is worker boarding platform 3
It is equipped with Reference numeral 4 denotes an elevating table, which is supported by the trolley 1 via a hydraulically driven pantograph link mechanism 5 so as to be able to rise and fall, and a work table 7 is supported on the elevating table 4 via a slide table 6.

The hydraulically driven pantograph link mechanism 5 consists of a pair of left and right pantograph links 8 that interlock with each other and a pair of hydraulic cylinder units 9 that drive the pantograph links 8, and includes a pair of front and rear fulcrums 10a, 10b on the lower end side of the pantograph links 8. Among them, the front fulcrum 10a is the bogie 1
The rear support point tab is supported by a slide guide 11 provided on the truck 1 so as to be movable back and forth via wheels. Also, pantograph link 8
Of the pair of front and rear fulcrums 12a and 12b on the upper end side, the front fulcrum 12a is pivotally supported at a fixed position on the lifting platform 4, and the rear fulcrum 12a is
b is supported by a slide guide 13 provided on the lifting platform 4 via wheels so as to be movable back and forth.

A hydraulic supply unit 14 for supplying hydraulic pressure to the hydraulic cylinder unit 9, that is, a hydraulic supply unit 14 consisting of a tank 15, a hydraulic pump 16, a pump drive motor 17, etc., is located directly below the lifting platform 4 on the trolley 1. It is installed in a unit support recess 18 provided in the unit support recess 18 .

Reference numeral 19 denotes a bellows-shaped cover that is stretched between the periphery of the base l and the periphery of the lifting platform 40 as required.

As shown in FIGS. 3 to 5, the slide table 6 includes a sliding body 21 that fits into a longitudinal slide guide rail 20 laid on the lift table 4, and a sliding body 21 attached to the lift table 4. A pair of front and rear contact plates 2 facing the front and rear stoppers 22
3a and 23b, and are supported so as to be slidable in the front-back direction within a range until the contact plates 23a, 23b abut against the front-back stopper 22. Moreover, the workbench 7 is
A sliding body 25 that fits into the left-right slide guide rail 24 laid on the slide base 6, and a pair of left and right contact plates 27a, 27b facing the left-right stopper 26 attached on the slide base 6. provision, abutment plate 27 a,
27 b is supported so as to be slidable in the left-right direction within a range until it comes into contact with the left-right stopper 26 .

28 is a centering device for the workbench 7. This centering device 28 includes a pair of left and right clamping bodies 30a and 30b supported horizontally and horizontally slidably on a guide rail 29 laid on the lifting platform 4 behind the workbench 7, both clamping bodies 30a, A clamping body centering cam 31 provided on the cart 1 to move the 30b toward each other, and a bracket 32 extending rearward from the workbench 7.
At the tip thereof, there is provided a clamped part 33 consisting of a vertical shaft roller pivotally supported so as to be positioned between the clamping bodies 30a and 30b.

Both the holding bodies 3Qa, 30b are brackets 34a, 3
4b, the tension coil springs 35 are stretched between the two clamping bodies 30a, 30b, and the inner sides of the clamping bodies 30a, 30b, which are in contact with the clamped portion 33, are biased toward each other. , both the holding bodies 30a, 3
A workbench centering cam surface 36a having a dogleg shape in plan view and guiding the held portion 33 to a central centering position in the front-rear direction when the two portions 0b move toward each other.

36b is formed.

The clamping body centering cam 31 has a pair of left and right cam surfaces 37a, 37b located in the shape of a square square.
, 30b through the opening 38 of the lifting platform 4 and downwardly extends the bracket 39a.

39b is provided protrudingly, and both brackets 39a, 39
A cam driven part 40a consisting of a horizontal shaft roller at the lower end of b.
40b is provided. 41 are both holding bodies 30a, 30
The stopper is attached to one bracket 39b, and is attached to one bracket 39b, and is attached to both clamping bodies 30a,
30b comes into contact with the other bracket 39a when it comes closest.

The trolley 1 is a trolley 43 supported by a guide rail 42 installed under the floor as shown in FIGS. 1 and 2.
a, 43b via connecting means 44a, 44b, and a leading trolley 46 is further connected to the front trolley 43a via a connecting rod 45. However, the first trolley 4
At 6, there is a driven dog 51 which can be freely engaged with and detached from a pusher 50 of a drive chino 49 supported by a guide rail 47 installed below the guide rail 42 via a trolley 48.
is provided, and this driven dog 51 is provided with the pusher 50.
As a result of this engagement, the trolley l travels along the guide rail 42 on the floor surface. In FIG. 2, reference numeral 52 denotes a power supply means, which supplies necessary power to the hydraulic pressure supply unit 14 and the like of the traveling truck I.

The conveying device configured as described above can be used as a means for conveying parts, for example, in the process of lifting and assembling an engine etc. from below to a car body conveyed by a trolley conveyor. The trolley 1 supports parts such as an engine on a workbench 7, and travels along a fixed route at a fixed speed.

Then, by the operation of the worker on the worker board 3, the pantograph link 8 is extended by the hydraulic cylinder unit 9, and the lifting platform 4 is raised to a predetermined height as shown in FIG. The work of assembling the engine and the like supported on the workbench 7 from below to the automobile body, which is being conveyed synchronously with the trolley 1 by the trolley conveyor, is performed.

When the lifting platform 4 is raised as described above, the cam driven parts 40a and 40b of the centering device 28 are separated upward from the clamping body centering cam 31 on the trolley 1, so that the pair of clamping bodies 30a30b It can move freely in the left and right direction on the guide rail 29. Therefore, the workbench 7 can be horizontally moved in any direction within a certain range. That is, since the workbench 7 is supported so as to be movable in the left-right direction on the slide table 6 which is supported so as to be movable in the front-back direction with respect to the lifting table 4, the workbench 7 is supported so as to be movable in the left-right direction, so that the abutting plates 23a and 23b are attached to the front-back stopper 22. It is possible to horizontally move in any direction forward, backward, left or right within the range of movement in the front and back direction where either of the abutting plates 27a, 27b abuts on the left and right stopper 26, and within the range of movement in the left and right direction where either of the contact plates 27a, 27b abuts on the left and right stopper 26. I can do it. As the workbench 7 moves, the held part 33 also moves together, but when the held part 33 (workbench 7) moves in the left-right direction, the -pair held part 3
One of 0a and 30b is pressed and moved in the moving direction, and the other clamping body is moved to follow by the tension coil spring 35. Moreover, when the held part 33 (workbench 7) moves in the front-back direction, the workbench centering cam surface 36a.

Both clamping bodies 30a, 30b are pushed apart against the tension coil spring 35 via 36b.

Of course, the range of movement of the workbench 7 in the front, rear, left and right directions is limited to the clamped portion 33.
is within the range (sixth
It is restricted to be within the shaded range 53) shown in the figure.

As mentioned above, since the raised workbench 7 can be moved in any direction, front, back, left, right, etc., the workbench 7 can be moved in any direction.
The assembly supported above allows the assembly work to be carried out while freely adjusting the position of the parts (engine, etc.) on the horizontal plane. FIG. 6 shows a state in which the workbench 7 has been horizontally moved to the front and right extreme positions.

Pantograph link 8 by hydraulic cylinder unit 9
By contracting the platform 4 and lowering the platform 4, the work platform 7 can also be lowered together as shown in FIG. 2. However, when the platform 4 is lowered in this way,
As shown in the figure, one of the cam driven parts 40a and 40b provided on the pair of clamping bodies 30a and 30b (the cam driven part 40a in the example of FIG. 6) is connected to the clamping body centering cam 31.
It abuts downwardly on one of the pair of cam surfaces 37a, 37b (the cam surface 37a in the example shown in FIG. 6), and moves in the left-right direction (the cam surface 37a in the example shown in FIG. 6) to the center position between both cam surfaces 37a, 37b as the lifting platform 4 descends. In the example in Figure 6, it is centered to the left). The other cam driven part also moves in the same direction, but as the workbench 7 also moves in the front and rear directions as shown in FIG. When the cams are pushed apart, both cam driven parts 40
a.

40b is forcibly narrowed down to the minimum interval by both the cam surfaces 37a, 37b, and the pair of clamping bodies 30a, 30
b move closer to each other to the minimum distance.

Due to the above centering action, when the lifting platform 4 reaches the lowering limit position, the pair of clamping bodies 30a, 30b are in the closest position to each other at the center position of the horizontal movement range, as shown in FIGS. 3 to 5. , and the clamped part 33 located between both clamping bodies 30a, 30b is at the center position of the horizontal movement range of both clamping bodies 30a, 30b, and both clamping bodies 30a, 3
It is positioned at the center position in the longitudinal direction of the workbench centering cam surfaces 36a and 36b of 0b. Since the workbench 7 moves together with the held part 33, by positioning the held part 33 as described above, the workbench 7 can be centered at the center position in both the front, rear, right and left directions as shown in the figure. become. In this state, the cam follower 40a
, 40b are held between the lower ends of both cam surfaces 37a and 37b of the holding body centering cam 31 from both left and right directions, so that the pair of holding bodies 30a and 30b hold the held part 33 at the centering position. Since the workbench 7 is fixed in this state, the workbench 7 is locked in the centering position in both the front, rear, right and left directions. In other words, by lowering the work platform 7 to the lowering limit position via the lifting platform 4 and the slide platform 6, the work platform 7 is automatically centered in both the front, rear, left, and right directions, and is locked at the centering position. When assembling on the workbench 7, parts can be safely loaded and transported after loading.

Although the movable trolley 1 is used as a base in the embodiment, it is also possible to use a base installed at a fixed position on the floor.

(Effects of the Invention) As described above, according to the centering device for an elevating workbench according to the present invention, when the workpiece supporter is lowered to the lowering limit position, the workpiece supporter is automatically centered in both the front, back, left, and right directions. Although it can be locked, it is possible to center the workpiece support in both the front, rear, left, and right directions using only a pair of clamping bodies that move toward and away from each other, and a mechanism that centers the slide table between the lifting table and the workpiece support. Since this is not necessary, the overall structure of the device is simple and can be implemented at low cost. Also, around the work support stand,
Since the centering device can be disposed at any one of the four locations on the front, rear, left, and right, a wide working space can be secured around the workpiece support table.

[Brief explanation of the drawing]

Figure 1 is a side view, Figure 2 is a rear view, Figure 3 is a partially longitudinal side view showing the detailed structure of the main part, Figure 4 is a longitudinal rear view of the same part, and Figure 5 is a cutaway plan view of the same part. FIG. 6 is a partially cutaway plan view showing a state in which the work support table has been moved to the upper limit position, and FIG. 7 is a schematic plan view of the entire structure. l...Dolly as a base, 4... Lifting platform, 5...
Pantograph link mechanism, 6...Slide base, 7...
- Workbench, 8... Pantograph link, 9... Hydraulic cylinder unit, 20, 24. 29... Guide rail, 21.25... Sliding body, 28... Centering device, 30a, 30b. ... Sandwiching body, 31... Cam for centering the sandwiching body, 33... Sandwiched part (vertical axis roller), 35... Tension coil spring, 36a,
36b...Cam surface for workbench centering, 37a, 3
7b... V-shaped cam surface, 40a, 40b... Cam driven part (horizontal shaft roller). Figure 2 Figure J Figure ゝ1 Figure 4 Figure 8 Ua 41.10

Claims (1)

[Claims] In an elevating work platform, a slide table is supported on an elevating table that can be raised and lowered relative to a base, and a work table that can be slid in a direction perpendicular to the sliding direction of the slide table is provided on this slide table. , a pair of clamping bodies movable toward and away from each other in the horizontal direction are supported on the lifting platform, and a clamped part located between the clamping bodies is connected to the worktable, and when the lifting platform is lowered, the A clamping body centering cam is provided on the base to move the clamping bodies in a direction in which the clamping bodies approach each other via cam driven parts provided on each clamping body, A centering device for an elevating work platform, comprising work platform centering cam surfaces that guide the clamped portion to a centering position in a direction perpendicular to the direction of movement of the clamp body when moving.