Extension device for vehicle lifter platform

Abstract

The invention provides an extension device for a vehicle lifter platform, capable of increasing the entire length of the vehicle lifter platform by pulling a platform extension moving portion rearward relative to a platform positioning portion. The extension device is so structured that in a platform automatically lifting when driven by a motor or hydraulic pressure, the platform positioning portion and the platform extension moving portion forms the length for normal use, the platform extension moving portion moves of the platform positioning portion towards the platform protruding direction to extend the platform by a desirable length, and the platform positioning portion and the platform extension moving portion are provided with locking mechanisms to lock in a positioning position and an extension moving position.

Description

technical field [0001] The present invention relates to a platform extension device equipped with a lifting device for a vehicle. Background technique [0002] In Patent Document 1, a sliding lifting device is disclosed, which includes: a main arm 20 pivotally connected to a chute 4 that can move freely in the horizontal direction; a side frame 23 pivotally connected to the front end of the chute 4; a platform 40 and the chute 4 are installed on the side frame 23 in a freely slidable manner; the chain 27 is connected between the side frames 23; Direction driving, the middle part of the main arm 20 will be supported by the lifting auxiliary arm 30, and the main arm 20 will rotate to lift the platform 40 in a substantially horizontal state. [0003] In Patent Document 2, a lifting device is disclosed, which is to erect fixed pillars fixed to the vehicle body on the left and right sides of the landing of the vehicle, so that the lifting platform fixed to the lower end of the l...

AI Technical Summary

Problems solved by technology

[0010] The platform 40 of the invention disclosed in the above-mentioned patent document 1 is constituted by a square plate type with the required horizontal width in the left-right direction and the required vertical length in the front-rear direction, and is raised and lowered in a substantially horizontal state, so although it has a simple structure And it has the advantage of being stable in terms of strength, but has the disadvantage that the storage volume becomes larger due to the inability to shrink it

[0011] The invention disclosed in the aforementioned Patent Document 1 is in the lifting device. The lifting platform includes: the main lifting platform, which is horizontally maintained at the lower end of the lifting pillar; ; and the auxiliary lifting platform, which is accommodated in the main lifting platform, and is supported in a manner protruding from the middle frame; therefore, it has an appropriate stepping width that is elongated when in use, and can be reduced as much as possible when it is stored. Those who seek to reduce the storage volume, however, the sliding of the middle frame and the auxiliary lifting platform to the main lifting platform is carried out through the conductive frame-shaped link 44, so there is a disadvantage that they must be stretched to the same width.

[0012] Furthermore, the auxiliary lifting platform is stored in the middle frame, and the middle frame is stored in the main lifting platform in sequence, so there will be a disadvantage that the difference in the thickness of each shell will occur at each stage.

[0013] In the invention disclosed in the aforementioned Patent Document 3, the platform 4 is composed of a main platform 4a and a sub-platform 4b, and slides up and down and in a double manner during storage, so as to reduce the storage volume and effectively utilize the space. When it is expanded to about twice the area when it is stored, it is configured to an appropriate length, but it cannot be extended beyond the appropriate length

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