SU1232641A1 - Hoist - Google Patents

Description

The invention relates to a lifting and transport machinery, in particular to the Nuremberg scissors type lifts.

The purpose of the invention is to increase reliability.

FIG. 1 s.hematically depicted lift, general view; in fig. 2 - the same, in the lower position; in fig. 3 is a view A of FIG. one; in fig. 4 is a section BB in FIG. one.

The lift consists of an upper loading platform 1 and a base 2, which are interconnected by two pairs of levers 3 of the Nuremberg scissors type, one ends of which are hinged in brackets 4 and 5, while others are installed in horizontal guides 6 and 7 respectively of the loading platform 1 and the base 2. On the base 2, the actuator 8 is horizontally mounted, acting on the levers 3 through a pair of connecting rods 9, one end of which is hinged in brackets 10 rigidly mounted on the shaft 11 connecting the arms of the arms 3 and the other hinged detecting on the carriage 12, peremeshayuscheys on rollers 13 along the guide 14. In turn the carriage 12 privo-

The drive 15 is driven by the transmission through the screw 15 - the nut 16, and the lengths of the connecting rods 9, brackets 10 and levers 3 are chosen so that the load on the screw 15 is constant at any position of the platform 1, which is achieved by fulfilling the ratio

5 platforms

"Ь tgai 02 3F TgoT

where ui and ui are the distances between the axes of the levers in the upper and lower positions of the load-bearing platform, respectively; & and 62 — the distances between the axes of the traverse and the fixed end of the lever, respectively, in the upper and lower positions of the load carrying platform;

The lai and the 2-angle are formed by a connecting rod with the direction of movement of the crosshead, respectively, in the upper and lower positions of the load-bearing platform. The device works as follows. The lifting of the loading platform 1 is carried out by the actuation of the drive 8 and the screw 15, rotating, moves the nut 16 together with the carriage 12 on the rollers 13 along the rail 14. Through the rods 9 through the brackets 10 fixed on the shaft 11, pushing the levers 3, one ends of which turn on the axles of the brackets 4 and 5, while others move in the guides 6 and 7, which provides a synchronous lift

five

platforms

Lowering the cargo platform 1 occurs when the rotation of the actuator screw 15 in the opposite direction. The nut 16, together with the carriage 12, moves backward on the rollers 13 along the guides 14, while the connecting rods 9 move the levers 3 through the brackets 10 and the platform 1 lowers.

Figm

U

Editor G. Volkova Order 2512/25

Compiled by A. Kovalevsky Tehred I. VeresKorrektor A. Obruchar

Circulation 799 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

A LIFT, comprising a base, a loading platform, an articulated lever mechanism located between them, including at least two articulated switching levers, one ends of which are mounted in horizontal guides mounted respectively on the platform and on the base, to which other ends of the levers are pivotally connected a sliding drive mounted on the base, connected to a shaft on which a lever is mounted pivotally connected to a connecting rod pivotally mounted on a sliding part of the drive, the fact that, in order to increase reliability, the end of the lever pivotally connected to the base is mounted on the shaft, the retractable part of the drive is mounted on a carriage mounted on the base with the ability to 'move parallel to the straight line passing through the axis of the shaft and the connecting rod of the connecting rod to the drive, and the parameters of the articulated link mechanism are determined from the relation D1 ₌ βι. * g “i, Я2 Bl 'lg "2' where Οι and а ₂ are the distances between the axes of the mounting levers on the base in the upper and lower positions of the cargo platform; δι and bg are the distances between the axis of attachment of the connecting rod on the drive and the axis of attachment of the fixed end of the lever, respectively, in the upper and lower positions of the cargo platform; cti and α ₂ are the angles formed by the connecting rod with the axis of movement of the carriage in the upper and lower positions of the loading platform.