JPH0441397A - Table lifter equipped with concurrently linking ascent and descent mechanism - Google Patents

Abstract

PURPOSE:To enable a table to be vertically moved upward by making the right and left links move simultaneously at the same speed through a linking member as well as making one end of a link for ascent and descent actuate untouchablly with a lower surface of the table and the upper part of a base case, so as to make a link mechanism conduct its opening and closing motion. CONSTITUTION:A couple of joining bodies 9 are fixed to the fixed side end in the right and left direction on the upper surface 3a of the base 3 of a table lifter 1, and four supporting members 17 are set on the moving side in two lines in the right and left directions at a fixed interval. The joining body 9 and the supporting member 17 are fixed to the lower surface 5a of a table 5 by making them face to a position set on the upper surface 3a of the base 3. A lower sliding axis 27 and an upper sliding axis 29 are set on the supporting member 17, and further a joining member 31 in lateral direction is set. When a pushing force is transmitted to an inner link 49 by a hydraulic cylinder 57, the moving side slides on the upper sliding axis 29 through a sliding body 33 to give the table 5 an ascending force. Then, as one end of the inner link 49 is put in connection by the joining member 31, the sliding can be performed simultaneously on the right and left links at the same speed to enable the ascending force to be given in laterally balance state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a table lifter that eliminates the possibility of a table tilting.

(Prior Art) As shown in FIGS. 7 and 8, a conventional general table lifter includes a base a, a table b disposed above the base a, and a table b disposed above the base a. b and a link mechanism C interposed between the base 3 as the main components.

The link mechanism C has an orthogonal cross-section, with one end rotatably attached to the base a by a pin d, and the other end fixed to both sides on the rear lower surface of the table b. An inner link h is provided with a roller g that transfers in the front and back direction on a transfer piece f, and one end is attached to a pin j on the lower end surface i of the table b.
A roller l that rolls in the front-rear direction is mounted rotatably on the roller l that is rotatably mounted on the roller l that rolls in the front-rear direction while the other end is attached to a rolling piece that has an orthogonal cross-section and that is fixed to both sides of the rear lower surface of the base a. The inner link h and the outer link m intersect with each other approximately at the center and are rotatably connected at the intersection n.

p is a hydraulic cylinder for raising and lowering the table lifter, and the rod q of the hydraulic cylinder p is connected to a connecting rod r installed between a pair of inner links h, and the rear end U is connected to a connecting rod r installed between a pair of inner links h. It is connected to a connecting rod V installed between the outer links m.

When operating the table lifter configured as described above, first, pressure oil pumped from a power source (not shown) is supplied to the hydraulic cylinder p to operate the hydraulic cylinder p, and the rod q is extended.

Then, the pushing force of the hydraulic cylinder p is transmitted to the pair of inner links h via the connecting rod r.

As a result, one end of the inner link h rotates counterclockwise around the pin d, while the other end rotates the table b upward as the roller g rolls forward on the rolling piece f. push up to

On the other hand, the pushing force is also transmitted to the pair of outer links m via the connecting rod V.

As a result, one end of the outer link m rotates clockwise around the bin j, while the other end rotates the table b upward as the roller l rolls forward on the rolling piece. Push up.

The table b is moved upward by the link mechanism C composed of a pair of inner links h and a pair of outer links m, which operate as described above.

Furthermore, when the hydraulic cylinder p is operated in the opposite direction to that described above to contract the rod q, the tensile force of the hydraulic cylinder p is applied to the pair of inner links h and the pair of outer links m via the connecting rods r and connecting rods V. are transmitted to each.

Then, the inner link h and the outer link m operate in the opposite direction to that described above, thereby moving the table b downward.

(Problem to be Solved by the Invention) However, as is clear from the above, it is essential for the conventional table lifter to have a structure in which the rollers g11 are always smoothly transferred from above to the transfer pieces f. It is a requirement.

On the other hand, it is necessary to prevent the table lifter as a whole from rising significantly when an unbalanced load is applied to the table b.

Therefore, as shown enlarged in Fig. 9, the transfer surface S of the roller is
A lifting prevention piece t is provided with a slight gap.

However, the above measure is a compromise measure to simultaneously satisfy the above two requirements, and even though it is made smaller than before, there is still a gap, so if a large unbalanced load is applied to table b. , table b is
It always slopes by an amount corresponding to the gap until it meets and comes into contact with the supporting member.

Due to the above-mentioned situation, it has not been possible to completely prevent the entire table lifter from lifting up.

In other words, the conventional table lifter has a structure in which the link mechanism is opened and closed by rolling rollers, and lifting force is directly transmitted to the table while supporting the table and the load loaded on the table. It was a fatal structural flaw that could not be avoided.

In view of the above, an object of the present invention is to provide a table lifter that allows one end of the link to operate without contacting the lower surface of the table and the upper surface of the base to open and close the link mechanism and move the table up and down. shall be.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention allows one end of one link to move on a sliding shaft provided in a state where it is suspended in the space below the table, while the other end is suspended in the space below the table. The link mechanism is opened and closed by sliding one end of the link in the front and back direction of the table lifter on the sliding shaft provided in the upper space of the base.
This opening/closing operation is performed simultaneously by the right link mechanism and the left link mechanism.

Specifically, the solution taken by the present invention includes a base having a plurality of connecting bodies fixed at intervals on the upper surface of one end, and a base having a plurality of connecting bodies fixed at one end at a position above the base. A table fixed at intervals on a lower surface, one end rotatably connected to the base or a connecting body fixed to the table, and interposed between the table and the base. Assuming that the table lifter is composed of a pair of link mechanisms arranged at intervals on the left and right, the link mechanism is provided on the lower surface of the table and the upper surface of the base at a position rearward from the position where the connecting body is fixed. A plurality of supporting members connected in double rows, a plurality of lower sliding shafts installed between the supporting members located on the rear line of the above-mentioned connecting body on the upper surface of the base, and the above-mentioned lower sliding shafts on the lower surface of the table. a plurality of upper sliding shafts installed between supporting members located on the rear line of the connecting body; a plurality of sliding bodies slidably fitted on the lower sliding shaft and the upper sliding shaft, respectively; A connecting member having both ends disposed horizontally with respect to the lower sliding wheel and the upper sliding shaft to interlock and connect with the sliding body, and having one end of the link mechanism inserted therethrough and installed between the link mechanisms. The table lifter is equipped with a simultaneous linked lifting and lowering mechanism consisting of the following.

(Function) According to the present invention, with the above-described configuration, when the actuating source such as a hydraulic cylinder is operated to extend the rod, a pushing force is transmitted to the pair of inner links.

Then, one end of the inner link rotates counterclockwise around the connecting body provided on the base, while the other end rotates on the upper sliding wheel toward the fixed side (the side where the connecting body is installed). By sliding on the table, it performs a standing operation and applies a lifting force to the table via the support member.

At this time, since one ends of the pair of inner links are interlocked and connected via the linking member, the sliding operation on the upper sliding portion is performed simultaneously and at the same speed on the left inner link and the right inner link.

Therefore, an increasing opening force is simultaneously applied to one side of the table from both the left and right sides.

On the other hand, the pushing force is also transmitted to the pair of outer links from the rear of the actuating source.

Then, one end of the outer link rotates clockwise around the connecting body provided on the bottom surface of the table, while the other end slides on the lower sliding shaft toward the fixed side, thereby performing a standing operation. At the same time, a lifting force is applied to the table via the connecting body.

At this time, since one end of the pair of outer links is interlocked and connected via a linking member, the sliding movement on the lower sliding shaft is performed simultaneously and at the same speed on the left outer link and the right outer link. .

Therefore, an increasing opening force is simultaneously applied to the other side of the table from both the left and right sides.

As described above, the table moves vertically upward with respect to the base by the pair of link mechanisms that perform the upright operation.

At this time, even if an unbalanced load is applied to the table, the table will not tilt because it is supported at multiple points by a plurality of supporting members and connecting bodies fixed tightly on the underside of the table.

Furthermore, when the actuating source is operated in the opposite direction to contract the rod, the tensile force of the actuating source is transmitted to the pair of inner links and the pair of outer links.

Then, one end of the inner link rotates clockwise around the connecting body, while the other end slides in the moving direction on the upper sliding shaft, and one end of the outer link rotates around the connecting body. while the other end slides on the lower sliding shaft in the moving direction.

Therefore, the pair of link mechanisms move downward, and the table moves downward perpendicularly to the base.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 to 6 show an embodiment of the table lifter according to the present invention, with Figure 1 showing the view from the side, and Figure 2 showing the view from the front with some parts omitted. Fig. 3 shows the view from the back with some parts omitted, Fig. 4 shows the relationship between the positioning of the limit switch and the moving range of the sliding body, and Fig. 5 shows the sliding body and the sliding body. FIG. 6 shows an enlarged view of the internal structure of the member adjacent to the support member, and FIG. 6 shows the internal structure of the support member and the mounting state of the limit switch.

1 is a table lifter according to an embodiment of the present invention, and the table lifter 1 includes a base 3 and a table 5 disposed above the base 3, as shown in FIG. ,
A link mechanism 7 interposed between the table 5 and the base 3
The main components are:

The upper surface 3a of the base 3 has a fixed side (A shown in FIG.
Two connecting bodies 9 are fixed to the end (direction side) at a predetermined interval in the left-right direction (direction perpendicular to the paper surface of FIG. 1).

The connecting body 9 includes a plate 11 directly fixed to the upper surface 3a of the base 3, and a cross-sectional shape of an approximately inverted T-shape, which is erected on the plate 11 and has a hole 13 bored in the center. It is composed of a connecting piece 15 having a shape.

Further, on the upper surface 3a of the base 3, a predetermined interval (elevating and lowering stroke of the table 5) is provided on the moving side (direction B shown in FIG. The four supporting members 17 are provided in two rows in the left-right direction as described above.

As shown in FIGS. 2 and 6, the support member 17 includes a plate 19 directly fixed to the upper surface 3a of the base 3, and a hole 21 bored in the center of the plate 19. and a stand 111j2 provided to communicate with the hole 21 from the upper end.
3 and a support piece 25 which stands upright and has a substantially T-shaped cross section.

The above-mentioned connecting body 9 and support member 17 are fixed to the lower surface 5a of the table 5 at positions corresponding in the vertical direction to the positions provided on the upper surface 3a of the base 3, respectively.

On the top surface 3a of the base 3 and on the bottom surface 5a of the table 5,
As shown in FIG. 1, a lower sliding shaft 27 and a lower sliding shaft 29 are respectively provided between the supporting members 17 provided at a predetermined interval on the moving side.

Furthermore, linking members 3<b>1 are provided horizontally on the lower sliding shaft 27 and the lower sliding shaft 29 in the following manner.

That is, at both ends of the linking member 31, as shown in FIG.
The connecting piece 37 is fitted into the connecting shaft hole 39 of the connecting piece 37, and the side surface is pressed and fixed by the holding screw 41.

Next, the portion 42 adjacent to the head 32 is inserted into a connecting shaft hole 40 bored at one end of an inner link 49 or an outer link 51, which will be described later, and which is adjacent to the connecting piece 37 with a slight gap. The fixing piece 43 is loosely fitted into the center hole 45 of the fixing piece 43 which is adjacent to the link with a slight gap, and the side surface is pressed and fixed by a cap screw 47.

Further, a sliding shaft hole 48 is bored in the sliding body 33.

A lower sliding shaft 27 is inserted into the sliding shaft hole 48 of the sliding body 33 disposed on the upper surface 3a of the base 3, and a sliding shaft of the sliding body 33 disposed on the lower surface 5a of the table 5. A lower sliding shaft 29 is slidably inserted into the hole 48, and the lower sliding shaft 27 and the lower sliding shaft 29 are inserted in the front and back direction of the table 5 (A or B indicated by an arrow in FIG. 1). The linking member 31 is configured to operate in conjunction with the sliding movement in the direction (direction).

Furthermore, in order to avoid the sliding body 33 colliding with the support members 17 provided at intervals in the front and back in conjunction with the vertical stroke of the table 5 due to the sliding movement of the sliding body 33, for example, a fourth As shown in the figure and FIG. 6, the lower sliding shaft 27 is placed on a member 32 fixed to the right side surface 3b of the base 3 and having a U-shaped cross section, and the forward eye position is maintained. Limit switches 38 are placed at positions corresponding to i34 and backward limit position 36, respectively.

By connecting this limit switch 38 and a control device (not shown), it is possible to ensure the sliding movement range of the sliding body 33 and the vertical stroke of the table 5.
The system controls the vehicle so that collisions with the vehicle are within a certain range that can be avoided.

It is also possible to add the limit switch 38 to an appropriate position between the forward limit position 34 and the backward limit position 36 to stop the table 5 at a desired position within the vertical stroke.

The link mechanism 7 includes a pair of inner links 49 and a pair of outer links 51, which intersect at approximately the center and are rotatably connected at an intersection 53.

The inner link 49 has one end connected to the connecting body 9 provided on the upper surface 3a of the base 3 and the bottle 5 partially fitted into the hole 13.
5, while at the other end, a head adjacent portion 42 of a linking member 31 disposed on the lower surface 5a side of the table 5 is loosely fitted into the linking shaft hole 40. As a result, they are rotatably connected, and are also operatively connected via a connecting piece 37 to a sliding body 33 that slides on an upper sliding shaft ◆29.

The pair of inner links 49 are connected by a connecting rod 52 that is fixed to the inner wall 49a and is also connected to a connecting rod 60 that is fixed and installed to the inner wall 49b from one end. , is.

The outer link 51 has one end connected to the lower surface 5a of the table 5.
The connecting body 9 provided at The head adjacent portion 42 of the member 31 is loosely fitted into the connecting shaft hole 40, so that it is rotatably connected and slides on the lower sliding shaft 27 via the connecting piece 37. It is also interlocked and connected to the sliding body 33.

The pair of outer links 51 are connected by a connecting rod 54 fixed to the inner wall 51a and also connected to a connecting rod 62 fixed to the inner wall 51b from one end. .

Reference numeral 57 denotes a hydraulic cylinder, and a rod 59 that expands and contracts by the operation of the hydraulic cylinder 57 is interlocked and connected to the connecting rod 52, and the rear part of the hydraulic cylinder 57 is also interlocked and connected to the connecting rod 54. .

Next, the operation of this embodiment will be explained.

First, the effect of the lifting movement process of the table 5 will be explained.

When a power source (not shown) is started and pressured oil is pumped to operate the hydraulic cylinder 57 and the rod 59 is extended, a pushing force is transmitted to the pair of inner links 49 via the connecting rod 52. be done.

Then, the inner link 49 has one end inserted into the hole 1 of the connecting piece 15, which is a component of the connecting body 9 provided on the upper surface 3a of the base 3.
3, the other end rotates counterclockwise via the pin 55 fitted into the upper sliding shaft 29 via the sliding body 33 in the fixed side direction (where the connecting body 9 is provided). It slides in the A direction shown in Figure 1).

Therefore, the inner link 49 performs a standing operation and applies a lifting force to the table 5 via the support members 17 that are symmetrically fixed directly to four locations on the lower surface 5a of the table 5.

At this time, one end of the pair of inner links 49
1, the sliding movement on the upper sliding shaft 29 is performed simultaneously and at the same speed on the left inner link and the right inner link.

Therefore, on one side of the table 5 (the side where the support member 17 is provided), the support members 17 are arranged symmetrically at four locations from the lower surface 5a to the lower surface 5a, so that the table is held in an equilibrium state. 5, a lifting force is applied from both the left and right sides at the same time.

On the other hand, the pushing force is also transmitted to the pair of outer links 51 via the connecting rods 54.

Then, the outer link 51 has one end connected to the lower surface 5 of the table 5.
A connecting piece 15 that is a component of the connecting body 9 provided on a
The other end rotates clockwise through the pin 55 fitted into the hole 13 of the lower sliding shaft 2 through the sliding body 33.
7 in the direction of the fixed side.

Therefore, the outer link 51 performs a standing operation and applies a lifting force to the table 5 via the connecting body 9.

At this time, one end of the pair of outer links 51 is connected to the linking member 3
1, the sliding movement on the lower sliding shaft 27 is performed simultaneously and at the same speed on the left outer link and the right outer link.

For this reason, an increasing opening force is simultaneously applied to the other side of the table 5 (the side where the connecting body 9 is provided) from both the left and right sides.

With the pair of link mechanisms 7 that perform the standing operation as described above,
The table 5 is moved upward perpendicularly to the base 3 by applying upward force to the lower surface 5a of the table 5 from a number of places simultaneously and in a balanced state between the left and right sides.

At this time, even if a large unbalanced load is applied to the table 5, the table 5 is fixed to the table lower surface 5a without any gaps, and is supported by the four supporting members 17 and two connecting bodies 9 arranged symmetrically. Since it is supported at 6 points, it will not tilt in any direction.

Next, the operation of the lowering movement process of the table 5 will be explained.

When pressure oil is pumped into the hydraulic cylinder 57 in the opposite direction to the upward movement, the rod 59 contracts and tensile force is transmitted to the pair of inner links 49 via the connecting rod 52.

Then, one end of the inner link 49 rotates clockwise via the bin 55, while the other end rotates on the upper sliding shaft 29 via the sliding body 33 in the moving side direction (B shown in FIG. direction).

Therefore, the inner link 49 moves downward and applies a downward force to the table 5 via the support member 17.

At this time, the pair of inner links 49 are simultaneously applied with a downward force to the table 5 in a balanced state in a left-right balanced state through the same force transmission path as in the upward movement.

On the other hand, tensile force is also transmitted to the pair of outer links 51 via the connecting rods 54.

Then, one end of the outer link 51 rotates counterclockwise via the bin 55, while the other end rotates on the lower sliding shaft 27 via the sliding body 33 in the moving side direction (as shown in FIG. B direction).

Therefore, the outer link 51 moves downward and applies a downward force to the table 5 via the connecting body 9.

At this time, a downward force is applied to the pair of outer links 51 from both left and right sides to the table 5 in an equilibrium state through the same force transmission path as during the upward movement.

With the pair of link mechanisms 7 that operate in a prone manner as described above,
The table 5 moves downward perpendicularly to the base 3.

(Effects of the Invention) As explained above, according to the present invention, the table can be vertically moved up and down with respect to the base while completely preventing the table lifter from lifting up as a whole, and
Even if a large unbalanced load is applied to the table, the table will not tilt, and the number of support points for the table will increase, dramatically improving the stability of the table.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is a partially omitted front view, and FIG.
Figure 4 is a rear view with some parts omitted; Figure 4 is an explanatory diagram showing the relationship between the arrangement of limit switches and the moving range of the sliding body;
The figure is a sectional view taken along the line XX' in Fig. 4, Fig. 6 is a sectional view taken along the Y-Y' line in Fig. 4, and Figs. 7 to 9 show a conventional general table lifter. It shows the structure,
FIG. 7 is a view corresponding to FIG. 1, FIG. 8 is a front view, and FIG. 9 is a partially omitted partial sectional view showing an enlarged transfer portion of the roller. t -------------Table lifter 3
---1...--1 Base 7--111...-1--Link mechanism 9--
・----Series assembly 17-------One support member 27--
−−−−−−−−1・Lower sliding shaft 29−・・・−・−・
−Lower sliding shaft 31 −−−−−1.−・Series engaging member 33 −−−−−1−−1−−−−Sliding body 48−−
・−1−−−−−Sliding shaft hole

Claims (1)

[Claims] (1) A base having a plurality of connecting bodies fixed at intervals on the upper surface of one end, and a plurality of connecting bodies arranged at a position above the base and fixed at intervals on the lower surface of the end. a table, one end of which is rotatably connected to the base or a connecting body fixed to the table, and which is interposed between the table and the base and is spaced apart from left to right. A table lifter comprising a pair of link mechanisms arranged respectively, the table lifter being arranged in double rows on the lower surface of the table and the upper surface of the base at a position rearward from the position where the connecting body is fixed. a plurality of lower sliding shafts installed between the support members located on the rear line of the above-mentioned connecting body on the upper surface of the base; and on the rear line of the above-mentioned connecting body on the lower surface of the table. a plurality of upper sliding shafts installed between supporting members located at the upper sliding shafts; a plurality of sliding bodies slidably fitted onto the lower sliding shafts and the upper sliding shafts, respectively; The lower sliding shaft and the upper sliding shaft are respectively disposed horizontally to be interlocked and connected to the sliding body, and one end of the link mechanism is inserted through the linking member, which is installed between the link mechanisms. A table lifter with a linked lifting mechanism.