JPS58177897A - Table lifting gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a full lift device in which a link mechanism for raising and lowering a table is operated using a movable pulley.

Conventionally, table lift devices have been operated by hydraulic pressure, which has led to high equipment costs for the hydraulic device and increased manufacturing costs.

The first objective of the present invention is to reduce manufacturing costs by using a movable pulley instead of a hydraulic system, and to generate a large force by appropriately changing the number of movable pulleys installed and the number of times they are wrapped around the movable pulley. Our goal is to provide a table lift device that can.

First, to explain the present invention in detail, in the table lift device shown in FIG.
are intersected by the central shaft 8 in an X shape, and the lower end of the rotation link 4 is rotatably attached to the base 1 by the shaft 3,
The lower end of the movable link 7 is movably linked to the base 1, the upper end of the movable link 7 is rotatably attached to the table 11 on a shaft 12, and the upper end of the rotary link 4 is It is linked so as to be movable along the table 11.

A movable pulley 15 is attached to the moving link 7, and one end 20a of the tow rope 20 wound around the movable pulley 15 is fixed to the base 1, and the other end 2 (1)) is attached to the winding drum 19. It is wrapped.

Now, when the tow rope 20 is wound up by the winding drum 19, the movable link 7 is moved in the direction of arrow A, the rotary link 4 is rotated, and the table 11 does not move upward. Note that the movable pulley 15 may be attached to the rotary rick 4.

Examples applying this principle will be described in detail below.

Explaining the first embodiment shown in FIGS. 2 to 5, a base 1 is provided with rail portions 2 on both sides thereof. A rotation shaft 3 is installed between one side end portions of both rail portions 2, and a lower end portion of a rotation link 4 is fixed to both ends of the rotation shaft 3. A support shaft 5 is installed between the upper ends of both rotary links 4, and rollers 6 are attached to both ends of the support shaft 5. On the other hand, a central shaft 8 is rotatably installed between the intermediate portions of both rotary links 4, and a movable link 7 is provided at both ends of the central shaft 8 so as to be superimposed on the rotary link 4. They are crossed and pivotably mounted. A support shaft 9 is installed between the F ends of both movable links 7, and rollers 10 are attached to both ends of the support shaft 9. Both rollers 10 are linked so as to be movable along both rail portions 2 of the 111 construction base 1.

The upper ends of both movable links T are fixed to both ends of a rotation shaft 12 which is rotatably installed at one end of the table 11. The table 11 has rail sections 1 on both sides.
3, and the rollers 6 of both rotation links 4 are linked to be movable along both rail parts 13.

A fixed shaft 14 is installed between the intermediate portions of the f-section rods 7a of both movable links 7 below the central axis 8, and the fixed shaft 1
A movable pulley 15 is attached to 4. This movable pulley 15 can be rotated independently as shown in FIG.
Equipped with J15K.

On the other hand, a fixed pulley 17 is supported by a bracket 16 installed on the base 1 at the lower end of the rotary rick 4 on the inner side of the rotary shaft 3. This fixed pulley 11 includes a plurality of independently rotatable boos IJ 17 as shown in FIG.
It is equipped with a. Between the identification pulley 17 and the cape pulley 15, a traction cable 20 is wound around the pulleys 17I4 and 1511 alternately a plurality of times. This tow rope 20
One end 20a is fixed to the base 1 at a position 1 outside the support shaft 9 at the lower end of the movable link 7. Further, an electric motor 18 is installed on the base 11- at the lower end of the rotary link 4 than the rotary shaft 3, and the first winding drum 19 rotates from the electric motor 18ζ. The other end 2 of the cable 20
01) is wrapped around it. Incidentally, an auxiliary pulley 21 similar to the movable pulley 15 and the fixed pulley 17 is attached to the central shaft 8.

Next, the elevating and lowering action of the table lift device configured as described below will be explained.

FIG. 3 shows the table 11 in its lowest position.

In this state, the rotation link 4 and the movable link 7 are opened laterally to each other around the central axis 8, and their rollers 6 and 10 are connected to the rail portion 13 of the tape J 11 and the rail of the base 1. It is located at one end of section 2. and,
The movable pulley 15 and the fixed pulley 11 are separated, and the tow rope 20 is unwound from the winding drum 19. Further, the auxiliary pulley 21 holds down the L side of the tow rope 20 wound between the movable pulley 15 and the fixed pulley 17 from above toward the F direction.

When the load W is placed on the table 11 at this lowest movement position and the tow rope 20 is wound up by the winding drum 19, the rollers 10 of both movable links 7 move along both rails 2 of the base 1.
4, the rotary link 4 and the movable link 7 are laterally closed to each other around the central axis 8, and the rollers 6 of both rotary links 4 are also moved toward the table 1.
It is moved along both rail parts 13 of 1. Therefore, the table 11 is moved up. During this upward movement, the auxiliary pulley 21 separates from the tow rope 20. Then, at a predetermined upward movement position, the winding W
A brake is applied to 419 to maintain the upward movement position of the table 11. In this upward movement position, the movable pulley 15 and the fixed pulley 17 are close to each other.

Note that the winding force of the winding drum 19 required to move the table 11 upward becomes smaller as the number of windings of the tow rope 20 around the movable pulley 15 increases. In addition, at the initial stage of moving the table 11 from its lowest position shown in FIG. 21 is attached, the winding force of the winding drum 19 at the initial stage of the winding movement can be further reduced.

On the other hand, when the brake state of the winding drum 19 is released, the rotary link 4 and the movable link 7 are opened laterally due to the weight of the table 11, and the movable slide IL15 and the fixed pulley 17 are separated. , the towline 20 is unwound from the winding drum 19. Therefore, the table 11 is moved down and brought out at the lowest position shown in FIG. Note that the lowering speed of the table 11 is also regulated by the electric motor 18.

Next, another embodiment will be described. Note that FIGS. 6 and 7 are schematic diagrams of @3 and 4 showing the first embodiment, but the drawings of other embodiments described below are schematically illustrated in correspondence with these schematic drawings. It is depicted in

In the second embodiment shown in FIG. 8, the auxiliary pulley 21 in the first embodiment is omitted.

In the third embodiment shown in FIG. 9, a movable pulley 22 is installed in place of the fixed pulley 17 in the first embodiment. That is, a fixed shaft 22a is installed in the middle of the lower rod 4a of the rotary link 4 on the f side of the central axis 8, and a movable pulley 22 is attached to the fixed shaft 22a.

Although not shown, the movable pulley 15 in the first embodiment
be attached to the spindle 9 of the roller 10 in the movable link 7, or similarly attach the movable pulley 15 of the third embodiment shown in FIG.
Furthermore, it is also possible to similarly attach the movable pulley 22 in the third embodiment to the upper rod side of the rotary link 4 in correspondence with the movable pulley 15. In addition, in the first embodiment, as shown in the 10th prisoner, the winding drum 19 and the electric motor 18 are installed inside the rotating shaft 3 at the end of the rotating link 4T, and are arranged in parallel with the fixed pulley 17. Good too. In this case, the winding drum 19 is made movable along the spline shaft 19a rotated by the electric motor 18. Therefore, even if the one end 20B of the tow rope 20 moves on the winding drum 19 when the tow rope 20 is wound up, the winding drum 19 also moves along the spline shaft 19 & due to this movement. It becomes tr that one end 20a of the cable 20 is greatly inclined.

The fourth embodiment shown in FIG. 11 is an application example in which the table 11 is long laterally, and the rotation link 4 and the movable link 7 in the first embodiment are arranged on both sides of the table 11, and the movable link 1 is arranged on both sides of the table 11. The lower end portion is located outside the F end portion of the rotating rick 4. However, the fixed pulley 1 in the first embodiment
7 is not provided, and a tow rope 2o is wound between movable pulleys 15 on both sides.

The fifth embodiment shown in FIG. 12 is an application example in which the rotation link 4 and the movable link 7 in the first embodiment are arranged in three stages in order to raise the table 11 higher. The lower rotating link 4A and the movable link 7A are the same as those in the first embodiment, and the middle links 4B, 7B intersect at the center axis 8B and the upper links 4C, 7C intersect at the center axis 8C. The table 11 is connected to both upper links 4C and 7C in the same manner as in the first embodiment. Then, movable pulleys 15, corresponding to the lower rotary link 4A and the movable link 7A,
A fixed pulley 17, a winding drum 19, a tow rope 20, and an auxiliary pulley 21 are installed in the same manner as in the first embodiment.

In the sixth embodiment shown in FIG. 18, the connecting portion between one middle link 7B and the lower movable link 7A, the connecting portion between one middle link 4B and the lower rotating rick 4A, and the connecting portion between one middle link 4B and the lower rotating rick 4A, A movable pulley 24 similar to the movable pulley 15 in the first embodiment is attached to the connecting portion between the link IC and one middle link 7B, and the connecting portion between one upper link 4c and one middle link 4B. Auxiliary pulleys 21 are also attached to the center shaft 8B and the upper center shaft 8C.

The tow rope 20 is wound multiple times between both movable pulleys 24 of each stage, and one end 20B of the tow rope 20 is attached to the L of one upper stage link 7C.
It is fixed to the upper rod of the Niga -L stage link 4C via a pulley 23 attached to the rod. In this example,
Table 11! It is possible to prevent the upper links 4C and 7C from shaking at any time, and the winding force of the winding drum 19 is further reduced.

The seventh embodiment shown in FIG. 14 is a modification of the sixth embodiment, in which only one traction cable 2o is wound between both movable pulleys 24.

The present invention described in detail hereinafter utilizes movable pulleys 15 and 24 to raise and lower the table 11 as described above.

Since the mechanism is operated, the equipment cost is lower than that of a hydraulic system, which has the effect of reducing manufacturing costs. In addition, a large force can be generated simply by appropriately changing the number of movable pulleys 15, 24 installed and the number of times the movable pulleys 15, 24 are wound around them, and the movable pulleys 15, 24 can be driven by a small-capacity electric motor 18.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the principle of the present invention, Figs. 2 to 7 show the first embodiment, Fig. 2 is a perspective view showing the entire table lift device, and Fig. 3 is a diagram showing the table when it moves to the lowest position. A cross-sectional view of the device; Figure 4 is a cross-sectional view of the device when the table moves upward;
Figure 5 is a plan view showing the movable pulley and fixed pulley, and Figure 6 is a plan view showing the movable pulley and fixed pulley.
7 is a schematic diagram of FIG. 4, FIG. 8 is a schematic diagram of the second embodiment, FIG. 9 is a schematic diagram of the third embodiment,
Fig. 10 is a diagram showing another example in which the position of the winding drum has been changed, Fig. 11 is a schematic diagram showing the fourth embodiment, Fig. 12 is a schematic diagram showing the fifth embodiment, and Fig. 13 is a schematic diagram showing the sixth embodiment. FIG. 14 is a schematic diagram showing the seventh embodiment. Base 1, rail part 2, rotating link 4, moving link 7, table 11, rail part 13, movable pulley 15, constant slip tBty
, electric motor 18, winding drum 19, traction cable 20, movable pulley 22.2
4゜Patent applicant Fuji Transmission Co., Ltd. Agent
Person Patent Attorney On 1) Hiroshi Nobu 181 Figure 1, 1 Figure 2

Claims (1)

[Claims] An X-shaped link mechanism in which a pair of links (4) and (7) are pivoted by a central shaft (8) so as to intersect in a U-shape at the middle part thereof can be constructed with a small amount of tx. One or more stages are provided, and the lower end of the lowermost rotary link (4) is rotatably attached to the shaft (3) on both sides of one end of the base (1), and the lowermost movable link ( 7) The lower end portion is movably linked along the rail portions (2) provided on both sides of the base (1),
In addition, the upper end of the first-stage link (7) of said one Ai is rotatably attached to a shaft (12) on both sides of one end of the table (11), and ) in a table lift device in which the upper ends of the lowermost movable link (7) and the rotation link (4) are linked so as to be movable along the rail portions (13) provided on both sides of the table (11). At least one of them has a movable pulley (1
5) and the tow rope (
20) A table lift device characterized in that one end (20a) is fixed and the other end (201) is wound around a winding drum (19) rotated by an electric motor (1B). 2 The movable pulley (15) is attached to the lower lever (7a) of the lowest movable link (7) below the central axis (8), and the tow rope (20) is installed on the base (1). fixed pulley (
One end (20a) of the tow rope (20) is fixed to the base (1), and the other end (20b) is wrapped around the movable pulley (15) via the cable 17). The table lift device according to claim 1, wherein the winding drum (19) is installed on the base (1). 8 The movable pulley (15) is equipped with a plurality of independently rotatable pulleys (15a), and the fixed pulley (17) is also equipped with a plurality of independently rotatable pulleys (15a).
(It is equipped with a pulley (17B), and the tow rope (20) is a movable pulley (
15) pulley (15a) and fixed pulley (17) boo I
The chief lift device according to claim 2, which is wound alternately around J (17&). 4 The movable pulley (15) is attached to the lower rod (7a) of the lowest movable link (7) below the central axis (8), and the tow rope (20) is below the central axis (8). It is wrapped around the ni+ moving pulley (15) via the moving pulley (22) attached to the lower rod (4a) of the lowest rotating link (4) on the side, and the tow rope (20) is One end (201 is the base (1)
2. The table lift device according to claim 1, wherein the winding drum (19), which is fixed to and around which the other end (20b) is wound, is installed on the base (1). 5. The X-shaped link mechanism is arranged on both sides of the table (11) so that the lower end of the lowermost movable link (7) is located outside the lower end of the lowermost rotary link (4), The movable pulley (15) is attached to the lower rod (7a) of the lowest movable link (7) below the central axis (3), and the traction cable (20) is connected to the movable pulley of each X-shaped link mechanism. (15) and one end (2
0a) is fixed to the base (1), and the winding drum (19) around which the other end (2011) is wound is fixed to the base (1).
) The table lift device according to claim 1, wherein the table lift device is installed on the table. 6 The movable pulley (15) is attached to the lower rod (7a) of the lowest movable link (7) below the central axis (8), and the tow rope (20) is attached to the base (1) k. The rope is wrapped around the movable pulley (15) via a fixed pulley (17) installed at At the same time, the other end (
The winding drum (18) on which 2Q b) is wound is the base (1)
Table lift 1-device according to claim 1, which is installed on. 7 One end (20a) of the tow rope (20) is fixed to one of the uppermost links (7, 4) via a movable pulley (24) attached to the links (4) and (7) excluding the lowermost stage. A full lift device according to claim 6.