JPS597639B2 - general purpose lift - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a general-purpose lift used particularly in factories and warehouses.

Conventionally, as this type of general-purpose lift, one using a hydraulic mechanism as a drive device for elevating and lowering, for example, is known.

By the way, hydraulic mechanisms require a drive motor, oil pump, oil tank, valve piping, etc.
The large number of parts and complex structure make assembly complicated, which causes an increase in costs.

Furthermore, since oil leaks, it cannot be used for foods, medicines, and other items that must be protected from oil contamination.

This invention was made as a further improvement of the device already proposed by the inventor in view of the above points.1 The structure of the drive system is simplified, the number of parts is reduced, and the operation is smooth. The purpose of this lid is to make it possible to easily change the speed of lifting and lowering without contaminating the objects to be lifted and lowered.

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

In FIGS. 1 and 2, the general-purpose lift 1 includes a base 2, a lifting plate 3 provided opposite to the base 2, and a lifting plate 3 interposed between the base 2 and the lifting plate 3 on both sides. a pair of link units 4, a drive screw 5 that moves the elevating plate 3 up and down, a mover 6 that reciprocates in its axial direction following the rotation of the drive screw 5, and a mover 6 that moves in conjunction with the mover 6. The lever unit 7 is configured to actuate the link unit 4 at the beginning of the upward movement of the elevating plate 3.

A cask foil 8 is attached to the base 2 and is movable, and the elevating plate 3 is provided facing the base 2 via a link unit 4.

The link unit 4 is composed of a drive link 10 and a driven link 11, which are interposed in pairs between the base 2 and the lifting plate 3 on both sides, and whose center portion 9 is pivotally connected. The end 10a is pivoted to the elevating plate 3, and the base end 11a of the driven link 11 is pivoted to the base 2.

Also, the free end 10b of the drive link 10 is fitted to the side wall 2a of the base 2, and the free end 1lb of the driven link 11 is fitted to the side wall 3a of the elevating plate 3, so that the free ends 10b, 1lb are fitted to the side wall 2a of the base 2.
, 3a in the directions of arrows A and B.

Reference numeral 12 denotes a horizontal bar that interconnects the free ends 10b of the pair of drive links 10, and a connecting plate 13 provided with a floating elongated hole 13a as shown in FIG. 3 is attached to this horizontal bar 12. ing.

The drive screw 5 is rotatably supported on the base 2 by bearings 14, 14, and one end of the drive screw 5 is connected to a drive source such as a guard moke (not shown) so that it can rotate forward and backward.

The slider 6 is threadedly engaged with the drive lead screw 5 so that it can reciprocate in the axial direction (the same direction as the arrows A and B above) following the rotation of the drive lead screw 5. The formed protrusion 6a is fitted into the floating elongated hole 13a of the connecting plate 13.

A pair of lever units 7 are located between the base 2 and the elevating plate 3, and each has a drive lever 15 and a driven lever 1.
It consists of 6.

One end 15a of the drive lever 15 is pivoted to the side surface of the mover 6, and its base end 15b is pivoted to the base end 16b of the driven lever 16. It is centrally supported by

The driven lever 16 is formed with an arcuate end surface 17, and a horizontal bar 18 corresponding to the arcuate end surface 17 is mounted at a position offset from the center portion 9 of the pair of drive links 10 to the elevating plate 3 side. There is.

In the above configuration, in order to raise the elevating plate 3 from the state shown in FIG. 4A, that is, from the state at the bottom dead center, a drive source (not shown) is driven to rotate the drive lead screw 5 in the normal direction.

As the drive lead screw 5 rotates forward, the slider 6 that is threadedly engaged with the drive lead screw 5 moves in the direction of arrow A shown in FIG.

During such initial movement, the projections 6a of the slider 6 freely move within the floating elongated holes 13a of the connecting plate 13, so that the driving force of the drive lead screw 5 is directly applied to the drive link 1 of the link unit 4.
One end 15a is attached to the mover 6 without reaching the free end of 0.
In the process of the drive lever 15 pivoting on the drive lever 15 rising up, and the driven lever 16 following this rise, the arcuate end surface 17 of the driven lever 16 lifts the horizontal bar 18 mounted on the drive link 10, and the drive link The free end 10b of the link unit 10 is moved in the direction of the arrow A to vary the vertical angle θ of the link unit, and the elevating plate 3 is raised.

That is, when the elevating plate 3 initially rises, the driving force of the drive lead screw 5 is applied via the lever unit 7 and the horizontal bar 18 from the center 9 of the drive link 10 of the link unit 4 to a position on the elevating plate 3 side. Because of this, it can be operated smoothly with a relatively small driving force.

From the above state, the mover 6 further moves in the direction of arrow A, and after the position shown in FIG. The drive link 10 moves in the direction of arrow A via the connecting plate 13.
Directly extend the free end 10b to the free end 10b of the arrow A
direction, and the elevating plate 3 is raised to the top dead center as shown in FIG. 4C.

On the other hand, when lowering the elevating plate 3, the driving lead screw 5 is reversed and the slider 6 is moved in the direction of arrow B, so that the elevating plate 3 is lowered to the lower position as shown in FIG. descend to the point.

By forming the arcuate end surface 17 on the driven lever 16, the facing distance H between the elevating plate 3 and the base 2 at the bottom dead center position can be made smaller than when the driven lever 16 has an arcuate end surface 17. , the external volume when stored can be reduced.

The settings of the top dead center and bottom dead center are adjusted by the mounting position of a limit switch (not shown) provided on the side wall 2a of the base 2.

As explained above, since the initial movement when ascending is smooth, it can be easily operated by a small-capacity drive source, and the structure is simple and the number of parts is small, making it possible to reduce costs.Moreover, the hydraulic mechanism It has the advantage of not contaminating the objects being lifted and lowered, unlike conventional lifts that use lifts, and can be used over a wide range of areas.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view showing an embodiment of a general-purpose lift according to the present invention, Fig. 2 is a side view of the same, Fig. 3 is a perspective view of a connecting plate, and Figs. 4A to 4C are in operation. It is an explanatory diagram. 2...Base, 3...Elevating plate, 4...
... Link unit, 5 ... Drive lead screw,
6...Mover, 7...Lever unit, 9...Center, 10...Drive link, 10b...Free end, 11... Driven link, 12... Horizontal bar, 13... Connecting plate, 13a... Floating first child L15... Drive lever, 15a ...One end, 15b...Base end, 16...Followed lever, 16a...
・One end, 16b... Base end, 17...
Arc-shaped end face, 19...horizontal bar, θ...vertical angle.

Claims (1)

[Claims] 1 A pair of link units consisting of a driving link and a driven link pivotally connected at the center are interposed between opposite sides of the base and the elevating plate, and the vertical angle of the link unit is varied by operating the driving link. In a lift in which the elevating plate is moved toward and away from the base, a connecting plate with a long free-flowing hole is attached to the horizontal bar that connects the free ends of the drive links to each other, and the free-flow length of the connecting plate is fixed. A slider that reciprocates in the axial direction following the rotation of the drive screw is fitted into the hole, and one end of the drive lever constituting the lever unit is pivotally fixed to the slider, and its base end is fixed to the slider. is pivotally attached to the base end of the driven lever having an arcuate end surface, and a horizontal bar corresponding to the arcuate end surface of the driven lever is mounted from the center of each of the pair of drive links toward the elevating plate side, A general-purpose lift, characterized in that one end of the above-mentioned driven lever is pivotally fixed to a base.