JPS5846944Y2 - Mobile platform lift-up device - Google Patents

Description

[Detailed description of the invention] This invention relates to a lift-up device for a mobile platform that lifts the fixed legs off the floor and only the running wheels touch the ground when moving the platform. It is an object of the present invention to provide a lift-up device for a movable platform that can easily perform lifting operations with a small operating force.
Its composition is as follows.

The present invention is directed to a movable platform that is equipped with a self-supporting and movable chassis equipped with running wheels and a plywood panel that has fixed legs. The lift up device includes a slide link provided between the chassis and the plywood so as to be slidable parallel to the chassis, and a slide link provided so as to be slidable in a predetermined direction. A push-up pedal is connected to the link and pivotally mounted on the chassis so as to be rotatable in the vertical direction, and the slide link is linked to the slide link so that the slide link can be slid in a direction opposite to the sliding direction of the push-up pedal. A push-down pedal is pivotally mounted on the chassis so as to be able to rotate vertically, and the middle portion is pivoted to the slide link and the upper and lower ends are pivoted to the plywood and the chassis so that the pedal can bend and extend in conjunction with the sliding movement of the slide link. - or a plurality of elevating links provided, and the middle part is supported by the slide link so as to be slidable in the sliding direction of the link, and the upper and lower ends are pivoted to the plywood and the chassis so as to bend and extend with the middle part as a fulcrum. This lift-up device for a movable table is characterized in that it is equipped with a pressurized link and an urging member that always applies a force in the extension direction to the pressurized link.

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

FIG. 1 shows a movable platform with no lift-up device shown.

In the figure, 1, 1 is a base plate, and 2 is a chassis installed below the base plates 1, 1.

The base plates 1, 1 are supported on the floor by four fixed legs 11, respectively, and are folded inward by a folding mechanism (not shown) as shown by phantom lines in FIG.

The chassis 2 is formed by assembling frame materials such as square pipes into a picture frame shape, and is installed below the mutually adjacent ends of the base plates 1, 1, and is made independent and movable by four running wheels 21... It is configured.

The lift-up device according to the present invention is installed between the base plates 1, 1 and the chassis 2 in the center of the table, and the lift-up device is shown from the side in Figures 2 and after. .

In the following description, the length direction of the plywood will be referred to as the left-right direction, and the width direction of the plywood will be referred to as the front-rear direction, in accordance with the orientation of the figures from FIG. 2 onwards.

12 is a plywood frame, which is suspended between the left and right fixed legs 11. has been established.

The left end of the slide link 3 is supported by the chassis 2 via a bell crank 4, and the middle part is connected to two elevating links 5.
, 5 and pressurized links 6 to the plywood frame 12 and chassis 2.

The lifting links 5, 5 each have a pair of upper and lower link pieces 5.
1.52 are pivotally connected to each other at one end, and both upper and lower ends are pivotally connected to the plywood frame 12 and chassis 2 in a dogleg-shaped bent position.

In this configuration, two sets of upper and lower parallel link mechanisms are constructed by the plywood frame 12, the slide link 3, the chassis 2, and the two lifting links 5, 5, and the plywood frame 1
3, the slide link 3, and the chassis 2 are always maintained in a parallel relationship.

The bell crank 4 is in a dogleg position, with its central portion pivoted to the left end of the chassis 2 via a shaft 41, and its upper end attached to a sliding link 3.
It is pivoted to.

A push-up pedal 41 is integrally connected to the bell crank 4, and by depressing the push-up pedal 41, the bell crank 4 is rotated counterclockwise about a shaft 42, and the slide link 3 is moved to the left in the figure. It is configured to pull in the opposite direction.

Note that reference numerals 22, 22 are guide rails, and the upper portions thereof penetrate the plywood frame 12 and are fixed to the chassis 2 perpendicularly.

Reference numeral 7 denotes a generally inverted T-shaped push-down member, which has a long hole 71 in its vertical side, and engages the long hole 71 with a pin 43 protruding from the lower end of the bell crank 4.

Note that a stopper 72 is integrally connected to the upper end of the vertical side portion in a horizontal direction.

Further, the right end of the lower side is pivotally connected to the chassis 2 by a shaft 74 via a link 73, and a push-down petal door 5 is attached to the left end.
has been extended as a whole.

The pressurizing link 6 is formed by pivotally connecting one end of a pair of upper and lower link pieces 61 and 620 to each other by a shaft 63, and in a doglegged position, the central pivot 63 is inserted into the elongated hole 3 provided in the slide link 3.
1 to a spring holder 64 slidably fitted to the link 3, and both upper and lower ends are pivotally connected to the plywood frame 12 and chassis 2.

Reference numeral 8 denotes a pressure spring made of a compression coil spring, which is stretched between the spring receiver 32 fixed to the slide link 3 and the spring holder 64. That is, a spring force is applied in the direction in which the link 6 extends.

In other words, the pressurizing spring IJ ring 8 and the pressurizing link 6 are configured to constantly apply a lifting force to the alloy body.

Next, the effect will be explained.

As shown in FIG. 2, when the fixed legs 11.11 are in contact with the ground, the alloy body is held immovably on the floor surface, so that the stand can be used stably.

When it is desired to lift the fixed legs 11.degree. 11 off the floor in order to move the platform, the push-up pedal 41 is depressed.

This pedal operation causes the bell crank 4 to rotate counterclockwise and pull the slide link 3 to the left in the figure.
The link 3 slides to the left, and a parallel link movement is performed between the slide link 3, the plywood frame 12, the chassis 2, and the lifting link 5.50, with the chassis 2 as a fixed link.

That is, when the elevating links 5, 5 rise and push up the slide link 3 and the plywood frame 12, the fixed legs 11.11 rise together with the base plate 1 and rise above the floor surface.

The middle of this push-up is shown in Fig. 3, and the state in which the push-up is completed is shown in Fig. 4.Finally, as shown in Fig. 4, the lifting links 5, 5 are bent slightly to the opposite side from the straight position. the platform is held in the raised position.

Therefore, in this state, the alloy body can be moved by the running wheels 21, 21 that are in contact with the floor surface.

During this pushing up, in this device, the pressing link 6 and the pressing spring 8 always apply a pushing up force to the alloy body, so in other words, if a small lifting force is applied from the outside, , which is used as a trigger to immediately raise one unit, so the pressing force applied to the push-up pedal 41 can be minimized, and the push-up operation can be performed easily.

Incidentally, the upward movement of the rising block such as the plywood 1 is carried out in a stable manner along the guide rail 22 fixed to the chassis 2.

When the fixed leg IL11 is to be brought into contact with the ground again from the state shown in FIG. 4, the push-down pedal 5 is stepped on.

Due to this pedal operation, the push-down member 7 rotates counterclockwise, so that the bell crank 4, which is engaged and connected to the member 7 through the elongated hole 71 and the pin 43, rotates clockwise about the shaft 42. move.

As a result, the slide link 3 is pushed to the right in the figure and slides, so the elevating links 5, 5 return to their original bent dogleg postures, and the slide link 3 and plywood frame 1
2 each perform a parallel downward movement.

In this way, the fixed leg 11.11 is in the state shown in FIG. 2 in contact with the floor surface.

In addition, at this time, the pressure spring 8 acts as a fall resistance and exhibits a buffering effect.

Further, at the time when the push-down is completed, the stopper 72 of the push-down member 7 comes into contact with the pivot shaft 42 of the bell crank 4, as shown in FIG. 2, so that the lower limit position of the push-down pedal 5 is regulated.

Incidentally, in the above embodiment, a compression coil spring was used as the urging body to always apply a force in the direction of extension (pushing up) to the pressurizing link, but instead of this, a recoil spring, an air cylinder, etc. may also be used.

As described above, according to the present invention, it is possible to easily raise and lower the platform to move the fixed legs toward and away from the floor surface by simply operating the pedals.

Furthermore, since a lifting force is constantly applied to the table by the pressure link and the urging body, the lifting operation can be easily performed with a small operating force.

[Brief explanation of the drawing]

Figure 1 is a front view of the movable platform with the lift-up device omitted, Figure 2 is a side view of the platform including the lift-up device, Figure 3 is in the middle of pushing up, and Figure 4 is in the completed state. FIG. DESCRIPTION OF SYMBOLS 1... Base plate, 11... Fixed leg, 12... Base plate frame, 2... Chassis, 21... Running wheel, 3...
Slide link, 41... Push-up pedal, 5, 5...
- Lifting link, 6... Pressure link, 75... Press down pedal, 8... Pressure spring (biasing body).

Claims (1)

[Scope of utility model registration request] A lift-up device for raising and lowering the base plate and moving the fixed legs toward and away from the floor surface in a movable platform comprising a self-supporting and movable chassis equipped with running wheels and plywood having fixed legs. , a slide link provided parallel to and slidably between the chassis and the plywood, and a slide link connected to the slide link so that the slide link can be slid in a predetermined direction, and provided to the chassis in the vertical direction. A push-up pedal is rotatably mounted on the chassis, and a push-up pedal is pivotably mounted on the chassis in conjunction with the slide link so that the slide link can be slid in the opposite direction to the sliding direction of the push-up pedal. The intermediate portion is attached to the link so as to be able to bend and extend in conjunction with the sliding movement of the slide link.
The upper and lower ends are pivoted to the plywood and the chassis, and the middle part is supported by the slide link so that it can slide in the sliding direction of the link. Lift-up of a movable platform characterized by being equipped with a pressurizing link whose both ends are pivotally connected to plywood and a chassis, and an urging body that always applies a force in the direction of extension to the pressurizing link. Device.