DK152424B - LIFT WITH FORCED CONTROLLED WORKPLATFORM - Google Patents

Description

in

DK 152424B

Danish Patent No. 136705 relates to a lift with a forced-controlled working platform comprising a frame in which one end of a lifting arm is mounted pivotally about a horizontal shaft, and wherein the pivotally mounted platform rotated at the other end of another lifting arm is influenced by a forced steering mechanism which holds the platform substantially horizontally independent of the position of the lifting arm, and the peculiar according to the main application is that one or two oppositely mounted lifting arms are mounted on the rotating shaft and firmly connected to the lifting arm, and that on a horizontal pivot shaft which is firmly connected to the platform and in its horizontal position located vertically above the pivot axis of the platform, for each pivot wheel is mounted one or two freely pivotable palm arms which hang down on one side of the associated pivot wheel in such distance from this, that the pawl arm is engaged with the associated pawl wheel when - when moving the platform away from the wander one position - the shaft is moved away from the position vertically over the shaft.

According to the present invention, it is proposed that the platform and lifting arm have cooperating locking means which are different from those in the claim of Danish patent no.

136705, of which one locking member is hinged freely pivotally about a horizontal shaft, while the other is firmly connected to the platform or lifting arm at such a distance from the former locking member that the two members are brought into mutually locking position when the platform is rotated away from its horizontal position.

30 As long as the coercive control mechanism is working properly, i.e. as long as the working platform is horizontal, the freely rotatable locking means will be free of the other locking means. On the other hand, if the platform is moved out of the horizontal plane due to failing force control, the two sets of 35 locking means will engage each other, leaving the platform but locked to the lifting arm. There are thus 2

DK 152424B

brought simple and reliable means which automatically come into operation if the forced control mechanism fails.

The invention will now be explained in more detail in connection with the drawing, which schematically shows a lift 5 with a forced-controlled work platform and a catch protection according to the invention, seen from the side.

The shown lift shows a frame 1, which may be mounted on a vehicle chassis, a lifting arm 3 which can be pivoted about a horizontal shaft 2 relative to the frame 10 1, and a working platform 4 which can be pivoted about a horizontal shaft 5 in in relation to the lifting arm of a non-forcing control mechanism, which has the task of keeping the platform in the horizontal position shown, regardless of the inclination of the lifting arm 3.

Attached to the platform 4 is one or more arms 9 carrying a shaft 8. The shaft 8 is parallel to the rotational shaft 5 of the platform, and when the platform 4 is horizontal, the shaft 8 is perpendicular to the shaft 5, as shown in the drawing. On the shaft 8 is mounted a freely pivotable double pallet 7. The double pallet is surrounded by an internally toothed tooth ring 6 connected to the lifting arm, which is coaxial with the pallet shaft 8.

As long as the platform 4 is in the horizontal position shown, the double pallet 7 hangs down freely without engagement with the gear ring 6. If the forced steering fails and the platform moves out of the horizontal plane, for example downwards, the pawl shaft 8 with respect to the rotational shaft 5 be offset to the right of the drawing. Since the double pile 7 can swing freely - influenced by gravity -30 about the shaft 8, it will engage the gear ring in the drawing right, thus preventing the platform 4 from rotating further around the shaft 5 relative to the lifting arm 3. If the platform 4 is moved in the opposite direction - as indicated in the drawing - the shaft 8 will be displaced to the left and the left-hand paw in the drawing will engage the gear ring 6.

DK 152424B

3

Thus, in the construction shown, the platform and lifting arm can be moved arbitrarily between the shaft 5 as long as the platform is horizontal. As soon as the platform 4 exits the horizontal plane, one of the pallets will engage the tooth rim and prevent further rotation of the platform relative to the lifting arm.

If the platform is only unilaterally loaded and can only be moved in one direction by failure of the forced steering mechanism, one pawl and part of the dental crown may be omitted.

10

Claims (2)

A lift with a forced-controlled working platform (4) and comprising a frame (1), in which one end of a lifting arm (3) is mounted pivotally about a horizontal shaft (2) and the other end of the lifting arm about another horizontal 5 shaft (5) pivotally mounted platform (4) is actuated by a forced steering mechanism which holds the platform substantially horizontally independent of the position of the lifting arm (3), characterized in that the platform (4) and the lifting arm (3) have cooperating locking means which are different -10 just from the claims of Danish Patent No. 136706, of which locking means (6,7) one is suspended freely pivotally about a horizontal shaft (8), while the other is firmly connected to the platform or lifting arm of a such distance from the former locking means that the two members are brought into locking position when the platform is turned away from its horizontal position. Lift according to claim 1, characterized in that the freely rotatable locking means is constituted by a pawl arm (7) which is suspended on a horizontal pawl shaft (8) which is fixedly connected to the platform (4) and located in its horizontal position. vertically over the rotational shaft (5) of the platform, while the second locking means, fixed to the lifting arm (3), is at least part of an internally toothed gear ring (6) which is coaxial with the pawl shaft (8).