FR2583450A1 - Movable and dismantleable lifting scaffolding, device and use - Google Patents

Abstract

Movable and extensible scaffolding device capable of lifting two men and some light equipment to a working height. It is made of lightweight metal and is dismantleable into three parts 1, 2 and 3 which may be easily re-assembled : positioning, two shafts to be slid 14 and 42, two loops to be fastened at 21 and two power points to be connected 37 and 47. The lifting takes place by means of an articulated cross-pin system 2 driven by a winch, which may be manual or electrical, holding two cables which act on rollers and a strut. The floor 1 may be moved off-centre in both directions and two similar elements may be superimposed. This device is intended for carrying out light work from a height, maintenance of buildings, trees, pylons, observation and firing posts.

Description

The present invention relates to a lifting scaffolding device, capable of raising a work floor and setting it exactly to the desired height with a light load either: one or two people and light equipment
This device is likely to render services in the field of construction and maintenance of buildings. Motorized or attached to a vehicle, it can be used in stores, for pruning trees, maintaining pylons and in National Defense as an observation or mobile firing post.

 Until today the scaffolding used in the maintenance of buildings has been fixed. They require significant means of transport and handling for their implementation. Heavy and bulky planks must be mounted or lowered from floor to floor Their operation is not without risk. In the restoration quotes, the price for scaffolding is prohibitive compared to the cost of other work.

 Other machines used for working at height are built on the basis of hydraulic cylinders. They are heavy, their purchase price and the cost of their maintenance are high.

In Defense, observation and firing are done from low ground devices or from aircraft which are expensive and vulnerable materials0
This device, according to the invention, is constructed of light metal and characterized by its lightness, its mobility, its ease of implementation, its easy adaptation to the various problems of slight elevation and its low cost price.

 The present invention resides in the mechanical solution provided for the elevation of a platform by a set of movable braces and determined by the action of a winch acting on cables. The interaction between three rollers, two at a fixed position and the third movable, activates by means of a strut the basic uprights of the movable spider assembly and first determines the elevation of the floor . In a second step the direct traction of the cables on the feet of the elevator continues the elevation.

 The alignment of the movable feet, their fixity when stationary and additional security are obtained by a shaft secured to two gears moving on a rack and a blocking system when stationary.

 Possibly an offset floor increases the possibilities of the device but the use of a turret or any other adaptation is not excluded.

 The device described is essentially an appliance operating on electricity intended for the maintenance of buildings, but this description is in no way limiting.

Figure 1 shows a front view
Figure 2 shows a side view
Figure 3 shows a plan view of the chassis with the arrangement of the winch, fixed rollers and chocks
Figure 4 shows on a larger scale the final shaft of the two gears and the brake disc
Figures 5 and 6 relate to the claims or related points.

This device according to the invention oospore three parts: the movable floor (1), the lifting assembly with movable crossbars (2), the rolling table (3), each weighing only one hundred kilograms can be carried by two men . The set can title mounted in inaccessible places-
Bibles to vehicles.

 In the description, the word "front" means coupling hitch (4) the word "rear" the opposite hitch. The words "right" and "left" are used in relation to the direction of travel.

 The rolling table (3) comprises a frame (5) of rectangular shape supported by four fixed feet (6) but extendable by sliding tubes (7) with locking pins (8). A screw plate (9) ends each leg. A mounting bracket can replace the plate. Two additional feet (10 can be fixed in their housing (il) to the right or to the left of the device: as required. A space (12) for ballast is fitted out at the rear. A removable wheel set (13) is fixed on the chassis.

Fittings (14) are fixed to receive the axis of the front legs of the lifting system. Bearing tracks (I5) and racks (16) are fixed on the longitudinal side members of the frame,
Two rollers (17 and 18) are oriented transversely on either side of the table.

 An electric brake-motor element (19) of less than one kilowatt, with two directions of rotation, drives a roller winch (20) which carries two hooks (21) located on either side of its central part.

 A control handle (22) is fixed to the frame. This lever is held in the central position by spring, which corresponds to the "Stop" position when the electric current is cut. It can be moved by pressure to the "Up" or "Down" position.

 An electrical outlet (23), fixed to the frame, allows the electrical supply of the assembly. A switch (24) cuts the current in the Lsens "Up" when the maximum elevation is reached. Another switch (25) cuts the current in the "Lowering" direction in the low position.

 The lifting assembly with movable cross-pieces (2) is built according to the well-known principle of the pantograph or the Xuremberg scissors. It consists of one or more floors. Each floor has a minimum of four uprights (26); two on the right and two on the left. Each upright has three articulation points, one at its center (27) and the other two at the ends. The right uprights are connected to the left uprights by long axes (28) in tube. The uprights of the base floor have adaptations.

 A strut (29) is attached to each of the interior uprights or to the axle (28). They carry between them a roller (30). The feet of the outer uprights are connected by a tube serving as a housing for a shaft (31) integral with two gears (32) and a brake disc (33). A braking device (34) locks the disc in the "stop" position.

The shaft (31) carries at each end a bearing (35). Two cables (36) are attached to each of the rear legs; of the lifting system and have a loop at their other end. An electrical outlet (37) connects the part.

 baati lift.

 The heads of the uprights of an underlying stage are articulated with the corresponding feet of the immediately upper stage by long axes (38) connecting the two sides of the assembly. The upper rear axle of the last stage carries a bearing (39) at each end.

 The deportable floor (1) of the elevating scaffolding comprises a semi-fixed part (40) and a deportable part (41) relative to the first. The semi-fixed part is articulated at the front on the corresponding upper axis (42). Two paths (43) serve as a guide for the bearings (39). Two other raceways (44) guide the offset floor. A vertical upright (45) fixed to the left of the semi-folded part carries a control repeater (46) and two sockets (47). The first one to connect the elevating part to the floor, the other one for the use of an electrical appliance or a second elevator.

 The offset part (41) is in the form of a rigid rectangular frame bearing on its left and right sides of the bearings (48). A pin (49) blocks the deportable part and cleats (50) limit the movement of the floor forward and backward. The floor is of course surrounded by a safety barrier not shown in the drawings.

 The three parts of the lifting scaffold are assembled in the event that it cannot be installed using its wheels.

 The table, freed if necessary from its wheels and its accessories is set up and level. The cross brace assembly is placed folded on the table. The bearings (35) are engaged in their path (15).

The sliding axis is introduced into the fittings (14) and the front legs of the base uprights. The cable loops are passed through the hooks (21
The socket (37) is connected. The floor (1) is placed on the cross set (2). The bearings (39) are engaged in their path (4 and the axis (42) is introduced into its articulations. The electrical outlet (47 of arrival is connected to the lifting assembly.

 If the height of the floor must exceed four times the width of the eye sis, or if the ground is not firm, the additional feet (10) are put in their housing (11). If the floor has to be offset towards the front of the ballast, it will be installed around two thirds of the weight to be lifted. The electric power take-off (23) is connected to the mains.

 Thanks to the command repeater (46) the device can be ground or platform control.

 Bn passing the lever to the "Up" position the current flows through the braking system (33) which releases the disc (32). The motor element (19) centers the roller (20) of the winch on which the wedges (36) are wound at an angle due to the non-alignment of their ends. The traction operated on the cables (36) and by interaction between the rollers (17 and 18) centered on the frame and the movable roller (30) raises the latter which by means of the struts (29) unfolds the assembly elevator and propels the floor up according to the length of the uprights and the number of floors.

 During the xontension, the gear shaft (31) keeps the rear feet in alignment even in the event of a cable break.

 The interaction of cables and rollers decreases as the movable roll (30) rises to cancel itself when the cables are in a straight line.

But in the meantime the angle formed by the rear uprights with the front uprights decreases. The useful traction carried out by the cabals on the rear uprights increases and becomes sufficient to ensure only the continuation of the upward movement.

 As soon as the pressure on the joystick stops, it returns to the center.

The electric current is cut, the brakes are blocked which gives the feet of the basic rear uprights total fixity.

Safety is ensured on the one hand by the brake motor which retains the two targets and on the other hand by the disc braking system which locks the gear shaft on the racks0
At the maximum height, the front left foot operates the switch (24) which cuts the current in the 'Ascent' circuit.

 To offset the floor, simply remove the fixing pin (47) and apply pressure to the upright (45) on the side opposite the desired direction of offset. Replace the pin to immobilize the floor.

 To go back down 1 of the two levers is pushed in the "Down" direction. The brakes are released and the motor gently releases the cables, the lift assembly descends stressed by its own weight.

 At the end of the stroke, the switch (25) actuated by the left rear foot cuts the current in the "Lowering" direction.

 The maximum height reached varies directly with the length of the uprights (two to five meters) and the number of floors (one to four). However, given the low weight of this device, it is possible to fix (at 51) a similar device on the semi-folded part of the floor of the first device.

After having reached the maximum height of the first device and having tied it to its upper part, you can prop up the second device and reach a double height, which would be technically difficult if not impossible with a single device as important as it is.

Claims (13)

 1) Mobile and light lifting scaffolding device for carrying out construction, maintenance and lifting work at variable height and consisting of three parts: a platform for use (1) a lifting part (2) and a table (3)  The table consists of a b ti (5) supported by four legs (6) of adjustable length. It comprises at the front (left side of the drawing) two fixed points of articulation (14) and on the side rails two slides (15)  The lifting part (2) is a doable pantograph system construction of one or more floors. Each stage is made up of four uprights (26) articulated two by two in the middle on a long axis (27) connecting the two left uprights to the two straight uprights. The ends of the uprights of a stage are articulated on the corresponding ends of the stages adjacent by long oxes (38) connecting the right uprights ~ to the left risers. The two front feet of the base stage are articulated on the fixed points (14) of the bay; the two rear feet are guided by the slides (15) of the frame. The two front tettes of the upper floor are connected by a table (42) and the two rear heads carry an axis whose ends are provided with bearings (39)  The platform (1) has a semi-fixed part (40) articulated at the front on the corresponding plates of the lifting part (2) and two slides (43) where the bearings (39) circulate  This device is characterized in that its three parts are assemblable and separable, in that the elevation is done entirely mechanically from a winch, in that the platform comprises a movable part and in that more than one device can overlap.  2) Device according to claim 1 earactérise in that the four slides (15 and 43) have a free entry towards the rear  3) Device according to claims 1 and 2 characterized in that the axes 14 and 42 are sliding.  4) Device according to claim 1 characterized by a lifting mechanism comprising a winch (20), three rollers (17, 30 and 18) two cables (36) and two struts (29)  5) Device according to claims 1 and 4 caraoterise by two rollers (17 and 18) transverse whose axes are fixed on either side of the middle of the frame (5)  6) Device according to claims 1 4 and 5 characterized by two struts (29) secured to the central axis (28) of the base stage.  7) Device according to claims 1, 4, 5 and 6 characterized in that the struts (29) carry between them a roller (30)  8) Device according to claim 1 characterized in that the rear feet of the base stage are guided by a transverse shaft (31) integral with two gears (32) and a braking disc (33)  9) Device according to claims 1 and 8 characterized by lugs (16) located in the slides (15) on which the gears (32) are supported.  10) Device according to claim 1 characterized by rollers (48) mounted on the side rails of the offset floor (41) and moving in a guide (44)  11) Device according to claims I and 10 characterized by an amount (45) fixed to the semi-fixed frame (40) of the platform (1)  12) Device according to all of the preceding claims, characterized by four fixing points (51-) on the semi-fixed part (40) of the platform, intended to receive the four feet of a similar device.  13) Device according to claims from 1 to 12 taken as a whole characterized in that it is made of light alloy.