Horizontally supported planar surfaces – Vertically adjustable – Articulated link shifts surface
Patent
1996-04-29
1997-12-09
Chen, Jose V.
Horizontally supported planar surfaces
Vertically adjustable
Articulated link shifts surface
108147, A47B 900
Patent
active
056948646
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a scissor lift table with scissor elements that cross each other in each other's centre portion, are pivotable counter to each other, support a table plate and are each rigidly but pivotably connected at one end with the base on the one hand, and the table plate on the other hand, and at their other end displaceably rest against the base and the underside of the table plate, with a drive means for pivoting the scissor elements counter to each other to lift or lower the table plate, said scissor lift table comprising an essentially horizontal threaded spindle running through the pivot axis of the scissor elements, which is drive-connected at one end with a geared motor and threadingly engages at the other end with a spindle nut, and with guide elements that are pivotable at both ends, the ends being mounted on the geared motor, and one the spindle nut on the one hand, and on respective the scissor elements on the other hand.
BACKGROUND OF THE INVENTION
A scissor lift table of type is disclosed in DE-OS 41 06 371. The prior art scissor lift table works perfectly, but requires improvement to render its construction more simple.
SUMMARY OF THE INVENTION
The invention has as its objects the task of creating a scissor lift table of the type mentioned above, which, whilst being of a relatively simple construction, offers the greatest possible lift between the minimum and maximum heights.
In a scissor lift table of the aforementioned type, the above object is achieved according to the invention in that one of the geared motor and the spindle nut is pivotably fixed to or mounted on the pivot element of the scissor elements, and in that the other one of the geared motor and the spindle nut is connected with each of the scissor elements from within one of the lateral scissor angles by means of each of the guide elements that are pivotable at both ends thereof.
Therefore, in contrast to the prior art solution, only two guide elements pivotable at both ends are needed because the spindle drive is fixed in the pivot element of the scissor elements.
The pivoting axis can either be fixed to the side of the geared motor or by the spindle nut.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments will be explained in more detail below, with reference to the enclosed drawings, in which:
FIGS. 1 to 3 show three variations of a first embodiment of the invention;
FIGS. 4 and 5 show two variations of a second embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagrammatic illustration of a scissor lift table comprising an upper table plate 10 and a lower base plate 12. The table plate and the base plate do not have to comprise closed plates. They can rather comprise suitable frame or support constructions.
On the left side of FIG. 1 there are, on the underside of the table plate 10 and on the upper side of the base plate 12, rigidly attached articulations 14, 16 in which two scissor elements 18, 20 that cross each other are pivotably mounted. The scissor element 18, which is pivotably fixed to the base plate, extends upwards at a slant with respect to the underside of table plate 10, against which it rests by means of a rotatable roller 22. 0n the other side, the other scissor element 20 extends from articulation 14 downwards to the base plate, on which it rests by means of roller 24. At the point where the two scissor elements 18, 20 cross they are connected by means of a pivot element 26 defining a pivot axis. Also pivotably fixed on the pivot element 26 is the housing 28 of a geared motor 30 from which, in FIG. 1, a threaded spindle 32 projects to the left and accommodates a spindle nut 34 on the body portion thereof. When the threaded spindle 32 is rotated with the aid of the geared motor 30, the spindle nut 34 is displaced to the left or to the right of FIG. 1.
On the spindle nut 34 in FIG. 1 there are upper and lower elements 36, 38 on which guide elements 40, 42 are pivotably mounted, whose other ends are connected via pivot element
REFERENCES:
patent: 2993675 (1961-07-01), Tatter
patent: 3277501 (1966-10-01), Frisz et al.
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patent: 3901356 (1975-08-01), Butler
patent: 3917211 (1975-11-01), Daunderer et al.
patent: 4577821 (1986-03-01), Edmo et al.
patent: 4638610 (1987-01-01), Heikkinene
patent: 4744712 (1988-05-01), Mitchell
patent: 5131501 (1992-07-01), Yoshikawa
Chen José V.
Stamm Johann
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