FI65762B - I VERTIKALRIKTNING FOERSKJUTBAR PLATTFORM - Google Patents

Description

'65762

VERTICALLY MOVABLE PLATFORM - I VERTIKALRIKTNING FÖR-SKJUTBAR PLATTFORM

The present invention relates to a vertically movable platform with two superimposed scissor members mounted above each other, by means of which the platform remains in the same direction despite the movements of the scissor members, the vertical movements of the platform being effected by a screw connected to the scissor members. the speed and force of the vertical movement of the platform remains almost linear with respect to the rotational movement causing the lifting and lowering of the screw.

In order for the rotation of the screw to act linearly on the platform, the screw has previously been connected vertically between the base and the platform. But then the screw remains above the platform when the platform is below the maximum height. This problem is solved by replacing the screw with a collapsible hydraulic cylinder that fits vertically between the platform and the platform when the platform is in its lowest position. The disadvantage of a hydraulic system is that a small amount of elasticity is created in the pallet and if there is even a small leak in the system, the pallet slowly lowers due to its weight.

If the lifting movement of the platform is performed by means of a screw connected horizontally to the scissor member and connected to the arms of the scissor member, the ratio of the screw rotation to the lifting movement of the platform will change very much and the lifting motor must be dimensioned unnecessarily large. Lifting the platform near the lower position requires a multiple of the force required to lift the platform near the upper position.

U.S. Pat. No. 3,623,707 discloses a solution in which the required lifting force is a word in both the upper and lower positions.

The object of the present invention is to provide a new type of vertically movable platform. The pallet according to the invention is characterized in that the lower end of the pair of articulated arms of the upper scissor member is articulated to the second common articulation point of the articulating members, that the upper end of the articulated pair of lower articulating members is articulated to the opposite joint joint point

The invention provides a very small hoisting motor. When the platform is stopped at a certain level, it stays firmly in place because there is no elasticity or leakage in the screw as in the hydraulic cylinder. Also, with one and the same screw, the lifting movements can be applied to both scissor members, whereby the forces are more evenly distributed throughout the lifting system.

The invention will now be described by way of example with reference to the accompanying drawing, in which

Figure 1 shows a platform according to the invention in perspective.

Figure 2 shows a side view of the pallet.

Between the pallet 1 and the base 2 there are two scissor members 3, 4 mounted on each other, by means of which the pallet remains in the same direction despite the vertical movements. The vertical movements of the platform 1 are effected by means of a screw 5 connected to the scissor members. The screw 5 is connected to the scissor members by means of intermediate members 6, 7, by means of which the movement of the blade 1 remains almost linear with respect to the rotational movement of the screw 5. The transmission members 6, 7 consist of two articulated arms 8, 9 and 10, 11 mounted on each other, the second end 12, 13 of each pair of articulated arms being mounted on the second articulated bar 18, 19 of the scissor member 3, 4 and the opposite end 16, 17 on the second articulated bar 14, 15. acts on the common joint point 20, 21 of the articulated arms 8, 9 and 10, 1Γ in each pair. The lower end 17 of the articulated arm pair 10, 11 of the upper scissor member 3 is articulated to the second common articulated point 22 of the scissor members 3, 4. The upper end 16 of the lower scissor member 4 articulated pair 8, 9 is articulated to the second common articulation point 23 of the scissor members 3, 4. The same screw 5 acts on both pairs of articulated arms 8, 9 and 10, 11. The threaded end 24 of the screw is mounted on the extension 25 of the articulated arm 8 and the nut 26 of the screw is attached to the articulated arm 11. The screw 5 is a ball screw and the thread of the nut 26 is formed by a moving ball string. A screw 28 locking the movement of the screw is mounted on the screw 5 in connection with the drive mechanism 27.

The platform structure described above simply provides a vertically movable platform with a movement almost linear with respect to the rotational movement of the screw. The power of the drive mechanism 27 can thus be minimized, as can the power required by the drive mechanism and the power of the brake mounted on the screw, etc.

It will be apparent to one skilled in the art that the invention may vary within the scope of the claims set forth below. In addition to the drive mechanism shown in the drawing, the platform can be raised and lowered manually, e.g. with the help of a palm.

Claims (1)

4 65762 CLAIMS A vertically movable platform (1) with two superimposed scissor members (3,4) mounted above each other, by means of which the platform remains in the same direction despite the movements of the scissor members the screw (5) is connected to the scissor members (3,4) by a pair of articulated arms (6,7), by means of which the speed and force of vertical movement of the blade remain almost linear with respect to the rotation causing the screw lifting and kicking, characterized in that the upper pair of scissor members (6) ) the lower end (17) is articulated to the second common articulation point (22) of the scissor members, the upper end (16) of the articulated arm pair (7) of the lower scissor member (4) is articulated to the opposite common articulation point (23) of the scissor members and the same screw (5) acts on both articulated arm pairs -hin (6,7).