Mechanism to be mounted between two parts, whose mutual distance

Details Mechanism to be mounted between two parts, whose mutual distance Mechanism to be mounted between two parts, whose mutual distance

1985-06-14

1986-12-09

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Single throw lever

Mechanically actuated

B66F 300

Patent

active

046276009

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a mechanism to be mounted between two parts, whose mutual distance must be variable, preferably against a load, e.g. the bottom and the frame of a bed, which mechanism has a bar pivotally journalled and connected with one of the parts at its one end, the bar being at its other end which acts upon e.g. is in rest with, the other part, or between its ends coupled with a pivotally suspended driving means of the elongation or extension type.
The last mentioned end of the bar can, for example, bear against and act on the under side of a load surface, e.g. a goods platform or the bottom of a bed, or on the upper side of a pressure plate, e.g. on the chassis of a goods platform or on the frame of a bed. On the actuation of the bar by the driving means the bar will turn in its bearing and with the end situated opposite the bearing it will press the surface against which it bears away from the bearing, e.g. upwards.
If the said bar, which in the above-mentioned example acts as a lifting bar in such mechanism, is journalled at one end like a hinge and at a distance therefrom or at its other end is connected with a driving means operative and situated in the longitudinal direction of the bar, only a very poor ratio can be obtained between the greatest lift and the minimum height of the mechanism, because the perpendicular component of the power of the driving means and thereby the lifting force becomes very poor or completely disappears if the bar is lowered towards or to a horizontal position on a level with the driving means. Such mechanism inclusive of the driving means will also have a relatively great total length.
The purpose of the invention is to produce a mechanism, especially a lifting mechanism, which has an extremely small height in the initial position, and which has also small dimensions in the longitudinal and latitudinal directions, at the same time permitting a powerful lift, also from a horizontal initial position.
In view of this, a mechanism of the kind dealt with above is characterized in that the driving means actuates the bar mainly transverse to its longitudinal direction, and in that the axis of the bearing of the bar extends obliquely in relation to a plane containing the connecting line between the suspension point of the driving means and its point of application on the bar.
As a result of the oblique bearing of the one end of the bar, the driving means when actuating the bar will always make the latter turn in its bearing, the opposite end of the bar describing a circular arc with its centre in the axis of the bearing. This also applies even though in the initial position the bar is on a level with the driving means, thereby permitting the very low height.
The lifting capability expressed as the relationship between the lifting movement and the travel of the driving means, particularly the extension of the driving means, depends partly on the angularity of the axis of the bearing.
In an embodiment of the mechanism according to the invention in which the axis of the bearing follows the direction of a spatial diagonal in an equilateral cube having the bar as a lateral edge and having the driving means extending along a lateral edge at a right angle thereto on a level with the bar in the initial position, the maximum lifting movement, during which the bar is moved from a horizontal to a perpendicular position, will with a suitable mounting of the driving means result in an elongation of this to .sqroot.3 times the lifting movement, that is, an elongation by approx. 73%, as will be made more explicit below.
A mechanism according to the invention has a multitude of possible applications. By virtue of its short height, it can as stated be mounted between the frame and the bottom of a bed and serve as a bed lift, particularly in a sickbed, but it can for example also be used to lift goods and other material for transport, e.g. on a goods platform, from ground level to loading height at the platform of a truck such as a lorry or van or a goods waggon. Also by mutual displ

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