JPS595519B2 - table lifter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Classification/Field The disclosed technology belongs to the technical field of a table lifter that operates in a low folded position and with a small output when raising and lowering the table lifter in a foldable manner.

To explain the gist, the present invention has a pair of links interposed in a cross shape having a cross pivot point at the center between a base and a table, and the base of each of the pair of links is connected to the base and the table. The other ends of the pair of links are pivotally supported on each base of the table, and the other ends of the pair of links are movably rolled on the inner surfaces of the table and the base, for example, by means of a clevis-type hydraulic This invention relates to a table lifter in which a cylinder is interposed between the table base and a link facing the base, and in particular, the cylinder is pivotally supported on a pivot pin on the inside of the intersection pivot point of the pair of links. A bi-fold link formed by an upper link and a lower link is provided with both ends of the bi-fold link pivoted to the base and the base of the table, respectively, and the hydraulic cylinder is connected to the pin of the table base and the two bi-fold links. This invention relates to a table lifter which is pivotally supported and attached to a pin provided at the lower part of the upper link near the upper link from the pin pivot base end of the folding link.

BACKGROUND TECHNOLOGY Conventionally, a commonly used table lifter has a base 1 and a table 2, for example, as shown in FIG.
A pair of links 4゜4 interposed in a cross shape with a cross pivot point 3 at the center between the two links 4, 4
The bases 4', 4' of each of the links 4 are pivoted to the bases 1', 2' of the base 1 and the table 2, and a rolling roller 5 is provided at each other end 4'' of each link 4, Connect the end 4" to the base 1
A clevis-type hydraulic cylinder 6 is movably rolled on each inner surface of the table 2, and a clevis-type hydraulic cylinder 6 connects a pin 7 provided at the base 1' of the base 1 and the above of the link 4 facing the base 1'. It was used as an embodiment of a table lifter 12 which is pivotally supported by a pin 8 provided near a pivot point 3 by a clevis 9 and a knuckle 11 of a soldering head 10, respectively.

The conventional table lifter 12 shown in FIG. 1 is foldable and can be raised and lowered.

Although there are problems with the prior art, since the knuckle 11 of the rod head 10 is pivotally supported by a pin 8 provided near the pivot point 3 of the link 4 facing the base 1' of the base 1, the rod head The pushing direction of the table 2 is different from the lifting direction of the table 2, and the phase difference is a dog. Therefore, the pushing force due to the pushing action of the hydraulic cylinder 6 does not become N lifting as it is, but also increases in the lifting direction. Only force contributes to the lifting action, and in response to the lifting force at a low point, a hydraulic cylinder 6 with a power greater than the lifting force is required, and a large diameter cylinder must be attached or the hydraulic pressure must be adjusted, which is extremely difficult. However, it had the disadvantage of poor lifting efficiency.

To deal with this, as shown in FIG. 2, a clevis-type hydraulic cylinder 6 connects the clevis 9 to the base 1' of the base 1 with respect to a pair of cross-shaped links 4, 4 similar to those shown in FIG.
A table lifter 12 is attached to the table lifter 12 by pivoting the knuckle 11 of the rod head 10 to the pin 7 provided at the base 1 of the base 1, and the knuckle 11 of the rod head 10 to the pin 8 provided far from the pivot point 3 of the link 4 facing the base 1' of the base 1. ' came to be devised and used.

The conventional table lifter 12' shown in FIG.
The problems of the table lifter 12 shown in the figure can be solved.

Incidentally, since the knuckle 11 of the rod head 10 is pivotally supported by a pin 8 provided far from the pivot point 3 of the link 4 facing the base 1' of the base 1, the hydraulic cylinder 6 is moved from the rod when the table 2 is lowered. The head 10 cannot be stroked back to below the cylinder length, and it is impossible to make the head 10 into an acute triangle smaller than the triangle determined by the pivot points 7, 3.8 in the returned state, and therefore, the table lifter 12
' is restrained by the above triangle and cannot be lowered lower than that, resulting in what is called insufficient folding, and the lower level table condition cannot be obtained.Furthermore, when the table lifter 12' is not used, the stock, There was a drawback that transportation was cumbersome.

Purpose of the Invention The purpose of the present invention is to solve the technical problem of the table lifter based on the above-mentioned prior art, and to provide a cross-shaped interposition between the base and the table with a pivot point at the center. A pair of bi-fold links consisting of an upper link and a lower link, which are pivotally supported by a pivot pin on the side of the pivot point, have both ends pivoted to the base and the base of the table, respectively, and The above-mentioned drawbacks are eliminated by intervening and supporting the hydraulic cylinder between a pin at the base of the table and a pin provided at the bottom of the upper link closer to the upper link from the pin pivot base end of the bi-fold link. It is an object of the present invention to provide an excellent table lifter which solves the drawbacks and allows the table lifter to be folded up and down freely.

Structure of the Invention In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned object and the subject matter of the above-mentioned claims, is a cross-shaped structure having a cross-shaped pivot point at the center between the base and the table. A pair of links interposed between the links pivot the bases of the links to the bases of the base and the table, and the other ends of the links movably engage the inner surfaces of the table and the base. The table can be freely raised and lowered by the link action, and furthermore, a pair of bi-fold links consisting of an upper link and a lower link are pivotally supported by a pivot pin on the side of the pivot point. The hydraulic cylinder is pivotally supported to the base of the base and the table, and the hydraulic cylinder is pivotally supported to a pin at the base of the table and a pin provided at the lower part of the upper link closer to the upper link from the pin pivot base end of the bifold link. The folding link is placed as close as possible to other links to ensure complete folding, and the pushing force of the hydraulic cylinder is applied to the table base via the bi-folding link. This is a technical measure that increases the vertical component of the propulsion force and allows the table to be moved up and down with high efficiency.

Embodiment - Configuration Next, one embodiment of the present invention will be described below based on the drawings from FIG. 3 onwards.

13 is a table lifter which constitutes the gist of this invention,
The table lifter 13 is provided with a pair of links 17 and 17 interposed in a cross shape with a cross pivot point 16 at the center between the lower base 14 and the separate table 15, respectively, on both sides in the axial direction. , the pair of links 17, 17 interposed on one side connect the bases 17', 17' of the pair of links 17.17 to the bases 14' of the base 14 and the table 15, respectively.

15', and each other end 1 of the pair of links 17, 17
7", 17" are provided with rolling rollers 18, 1B for movably rolling the respective other ends 17", 17" onto the inner surfaces of the base 14 and the table 15, and the table 15 is mounted on the base 14. It can be raised and lowered horizontally parallel to the ground.

Therefore, inside the pair of links 17.17 on both sides, there is a pair of bifold links 19, 19 consisting of an upper link and a lower link.
The image tips 19', 19'' of the pair of bi-fold links 19, 19, which are arranged in parallel and whose respective base ends are pivoted to the pivot pins 20, are attached to the bases 14', 15 of the base 14 and the table 15, respectively.
A clevis-type hydraulic cylinder 21 is attached to the six bifold links 19, 19, and the hydraulic cylinder 21 connects the rod head 24 with the clevis 22 of the rod head 24 to a pin 23 provided at the base 14 of the base 14. The six bi-fold links 1 have the knuckles 25 facing the base 14' of the base 14.
The pins 20 of 9 and 19 are attached to pins 26 provided in the lower part of the upper link 19 nearer to the upper link 19 from the pivot base end.

In addition, 27 is a hydraulic hose, and the above-mentioned hydraulic cylinder 21
The other end is connected to the oil inlet/outlet port 28 of the oil inlet/outlet port 28, and the other end is later connected to a hydraulic unit incorporating a hydraulic pump (not shown).

Embodiment - Effect In the above configuration, the table 1 of the table lifter 13
5 can be folded with a small amount of power and moved up and down. First, a hydraulic unit including a hydraulic pump (not shown) is appropriately operated to bring the table 15 of the table lifter 13 in a folded state to a high pressure state, as shown in FIG. When a predetermined amount of hydraulic oil is injected into the port 28 via a solenoid valve (not shown) in response to the rise of
A pushing force is applied to the base 14' of the base 14 to the pin 26 of the upper link 19, and the upper link 19 rotates clockwise in FIG. 4 about the pivot point 20.
A rotational force in the same direction is applied to the base 17' of the link 17 parallel to the upper link 19 as a point of action through the pivot of the tip 19'.

The link 17, which is parallel to the upper link 19, rotates about the pivot point 20 in response to the clockwise rotational force, and the base 17' of the link 17 rises, and the tip 17 of the link 17 moves upward.
The rolling roller 18 moves along the inner surface of the base 14 to the left in the figure.

On the other hand, the above-mentioned upper link 19 and other cross-shaped links 17
The base 14' of the base 14 also receives the lifting force of the pivot point 16.
The rolling roller 18 of the link 17 also transfers to the left while applying a lifting force to the inner surface of the table 15, and both links 17.degree. 17 rotate symmetrically to lower the table 15. 15 is raised horizontally parallel to the base 14, and the load on the table 15 is lifted to the end of the lift as shown in FIG.

In addition, the table lifter in the raised state shown in FIG. 5, -1
When the solenoid valve (not shown) is switched in response to the lowering of the table 15 and the drain is connected to the drain via the flow rate regulating valve, the table 15 undergoes a reverse process to the upward movement of the table 15 due to its own weight and the weight of the objects placed on it. Since the hydraulic cylinder 21 is provided close to and in the same direction as one of the descending links 17 of the pair of links 17 and 17, the hydraulic cylinder 21 is moved approximately horizontally as shown in FIG. The table 15 can be lowered as low as possible, and objects not shown can also be lowered along with the table lifter 13. When the table lifter 13 is not in use, the table lifter 13 can be transported and stocked in a folded state.

Therefore, the table 15 of the table lifter 13 is shown here.
is raised by a hydraulic cylinder 21 with a small driving force, and
When the table 15 is lowered, the table lifter 13 is lowered as far as possible and is in a folded state.

Also, as the table 15 rises, the transfer roller 18 moves to the fourth position.
Even if the table 15 is transferred to the left side of the figure and the center of gravity is also displaced accordingly, the displacement of the center of gravity will be small because the hydraulic cylinder 21 is attached to the left side, and the table 15 can be raised with high stability.

Other Embodiments Note that the embodiment of the present invention is not limited to the above-described embodiment, and may be such that the bi-fold link is provided outside the cross-shaped link, and the upper link of the bi-fold link is arranged so as to correspond to the length of the hydraulic cylinder. It is also possible to change the design into various shapes.

Effects of the Invention According to the present invention, a pair of links interposed in a cross shape with a cross pivot point at the center between a base and a table connects the base of each of the pair of links to the base. and each base of the table, each other end of each link is movably engaged with each inner surface of the table and the base, and an upper link and a lower link are pivotally supported by a pivot pin on the side of the pivot point. A bi-fold link comprising a link pivots both ends of the bi-fold link to the base and the base of the table, respectively, and a hydraulic cylinder connects the pin of the table base and the pin pivot base end of the bi-fold link. By being pivotally supported by a pin provided at the bottom of the upper link closer to the upper link, the hydraulic cylinder can be installed approximately parallel to the adjacent link, and the hydraulic cylinder can be mounted as much as possible against the lowering of the table. It can be lowered to the lower level and can be completely folded, making it possible to raise and lower loaded heavy items to any level up to the lower level.If the table lifter is not used, the transport stock can be stored in the folded state for handling. This has an extremely convenient effect.

In addition, even though the hydraulic cylinder is attached approximately parallel to the adjacent link, the pushing force of the hydraulic cylinder acts on the table base as a lifting force through the bifold link without constantly increasing or decreasing. As a result, the rod head of the hydraulic cylinder has the same function as a mode in which the rod head is directly supported on the table base, and therefore, the lifting speed and lifting force can be kept constant, and furthermore, the hydraulic cylinder can be pushed forward. Since the force is directly converted into table lifting force, there is no need to increase the pushing force of the hydraulic cylinder more than necessary, and a small diameter hydraulic cylinder can be used.
In addition, it has the remarkable advantage of being able to raise the table sufficiently with low oil pressure.

Furthermore, there is no need to install a heavy hydraulic cylinder, the table lifter can be made more compact, and the table lifter also has the additional advantage of being able to minimize its total weight.

Furthermore, since the hydraulic cylinder is attached to the opposite side of the transfer roller at the end of the link, the transfer roller is transferred to the side where the hydraulic cylinder is attached as the table rises, and even if the center of gravity is displaced, the range is extremely small. It also has the advantage of being a narrow and therefore highly stable table lifter.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional table lifter, and Figure 1 is a front explanatory view of a foldable table lifter.
Figure 2 is a front view of the table lifter with high lifting efficiency.
Figure 3 and subsequent figures show one embodiment of the present invention. Figure 3 is a perspective view of the table lifter, Figures 4 and 5 are diagrams of the lifting and lowering process of the table lifter, and Figure 4 shows the table lifter in its folded state. The process diagram, FIG. 5, is a process diagram of the rising edge state. 14...Base, 15...Table, 16...Cross pivot fulcrum, 17,17...Pair of links, 21...
Hydraulic cylinder, 13...Table lifter, 20.
... Pivot pin, 19, 19... Bi-fold link, 19'
, 19"...Both ends, 19...Upper link, 26
···pin.

Claims (1)

[Claims] 1. A pair of links interposed in a cross shape having a cross pivot point at the center between the base and the table pivots the base of each of the pair of links to each base of the base and the table, In the table lifter, the other ends of the pair of links are movably engaged with the inner surfaces of the table and the base, and a hydraulic cylinder is interposed between the table base and the link facing the base. A bi-fold link consisting of an upper link and a lower link whose base ends are pivoted to a pivot pin on the side of the cross pivot point of the link, and both ends of the bi-fold link are pivoted to the base and the base of the table, respectively. ,
The hydraulic cylinder is pivotally supported by a pin on the table base and a pin provided at the bottom of the upper link closer to the upper link from the pin pivot base end of the bi-fold link. table lifter.