DE7925229U1 - LIFTING LIFT WITH INDEPENDENT TELESCOPIC MOVEMENT AND PIVOTING MOVEMENT OF THE BOOM - Google Patents

Description

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File number G 79 25 229.2

78-oC ^{: rT} J -I 1 CI .51

Lothar Forster

280C Bremen, Kirchwer 152

£ _Lifting work platform with interdependent telescopic movement and pivoting movement of the boom>

The invention relates to a lifting work platform with a swiveling and telescopic! edible boom, the working "clettform carries whose pivoting movements by a special hydraulic cylinder in a direction of movement synchronous to the telescopic movement the telescopic parts is controlled mechanically secured. ~ ?? through unfavorable positions of the boom are avoided, so that the work platform with a much larger payload with the same Dimensions of the components can be loaded. Likewise, the ballast, the counterweight, can be reduced because the Ki-no> moment gets smaller ..

The innovation is based on the idea that the footwork platform shown in Figure I rarely has the fully extended length of the telescopic parts (3) and (4) in the horizontal position (n) and the only slightly deviating positions (o) and (m is needed), since then enters the work platform (2) eg in a ^u auswand (11) in the same position, is situated when the H "barbeitsbühne detail shown on the Hsuswand as shown in Figure I.

In this way, statically unfavorable usage positions are avoided, which are not only through the payload (1), but to a greater extent through dip Dead weights of the working platform (2) and telescopic parts (3; u. develop.

A synchronization between the movement of the telescopic parts (^) and (M through the "etten (6") and (7) with the pub of the 't'ondercylinder (10), which is inevitable in one direction of movement) ensures that further telescoping is achieved is only possible if the A'-sleeve consisting of the round tube (5) and the telescopic parts (L) and (3J) has its piston rod through the outer cylinder (10) located between the pivot points (A) and (7) (21) retracts or the distance Α-'ύ is shortened.

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File number υ 79 25 229. * 2!
78-SO HU-i 1 ^ .1.81

According to Figure II, the synchronism between the pivoting movement of the Base pipe (5) and the ^ eleskopiervorg-nng ensured by the hydraulic motor (12) operates the chain (7) both via a worm gear (8) and a chain wheel (9), el.-'ich via the toothing (13) '- i "both gears (22) and (23) and the cone ^ adpsar

(25) transmits a rotary movement to the threaded spindle C15). Included The threaded spindle (15) assumes a control function for the control slide (JO), as well as a safety function for the piston rod (21).

Via the piston rod (21), the piston (i8) _and the threaded nut (I9) with self-locking thread, the threaded spindle (15) and the cone

(26) is the tensile force from the articulation point (Z) to the articulation point (A) transferred.

The special cylinder can only be actuated when the piston (18) is pressurized on the piston surface (23), as the The torque of the hydraulic motor (12) is not due to the design sufficient to turn the loaded threaded spindle (15) su.

In the pause position, the oil pressure regulating opening (27) is closed by the control slide. If the telescopic parts (3) and (4) are to be opened, a pump (not shown) supplies oil to the feed line (28), which generates pressure on the piston surface (23) and the piston (18) with piston rod (21 ) moves in by a small stroke, whereby it moves the threaded nut through friction between the threaded nut (18) and the inside of the piston rod (21) so that the control slide (3D) opens the oil regulating opening (27), whereby the oil that continues to flow in can run through the drain opening (2Zi), whereby the movement of the piston (18) stops. At the same time, the threaded spindle (15) is relieved and can be easily rotated. By assigning a reciitsgänrl ^ en worm in the worm gear (£). one right-handed. The toothing of the gear wheels (22> and (23) and a left-hand thread for the threaded spindle (15 ^Λ with threaded nut (18)) is the correct sequence of movements between extending the telescopic box parts (3) and fii) and retracting the piston ( 21) present the continuous rotary movement of the threaded spindle (15) as it rotates out of the threaded nut (18) in the direction of the articulation point (.A), the oil regulating opening is kept closed during the movement process by the control slide (3C ^ and thus the threaded spindle d

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File number G 7 * 25 225, P.

78-SO HU-I 10.1.01

By a non dagestelltes valve, the drain opening can (21 ₍₎ in addition. Are closed. In this case, the piston performs f ¹ 5) about a movement in the direction of articulation (A) to the position (i 3k), without that a rotational movement of the Threaded spindle (15) takes place; he lifts it from the threaded nut (19) ah. In this case, there is a simple rotary movement of the boom about the pivot point (D), so that 7, .B. the articulation point (31) of the work platform (2) moves from the "n" position to the "u" position. Subsequent telescoping out into position "q" is possible by actuating the hydraulic motor, since the tension-relieved threaded spindle (15) of the hydraulic motor (12) does not hinder the rotary movement easily.

A special design of the aspect ratios of the triangle formed by the hinge points (A) - (Z) - (D) can achieve that the Eewegunr: the work platform in another area almost takes place vertically in a curved path that is only slightly curved. Through this the operation of the aerial work platform when driving along is on vertical walls simplified.

Claims (2)

7Ö-S0 HU-I 10.1.81 Protection claims 1. aerial work platform with a swiveling and telescopic boom, whose pivoting and telescopic movements are coordinated by mechanical coupling of the drive elements so that the extension width avoids unfavorable static moments in horizontal and flat angles of attack and with increasing angles of attack gradually the full extension of the telescopic parts (3) and (4) is achieved, as characterized in that a hydraulic motor (12) both via a worm gear (8), chain wheels (9), the chains (7) with the telescopic parts (3) and (4) mechanically, is coupled, as well as the same hydraulic motor (12) via the gears (25) (17) and the bevel gear pair (24) with the threaded spindle (15) of the special cylinder (10) is connected. 2. aerial work platform according to claim Idadurck gekennzei chn e t that a retraction of the telescopic parts (3) (4) with the associated working platform (2) from the respective maximum Position is possible by the threaded nut (19) and the piston (18) consist of two separate components »: - ... ; . · ·. ■; -