Implements or apparatus for applying pushing or pulling force – Single throw lever – Lazy tongs
Patent
1986-11-24
1988-06-28
Schmidt, Frederick R.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Lazy tongs
414402, B66F 322
Patent
active
047534192
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for a hydraulic lifting table of the scissor type with at least two pairs of scissor arms pivotally attached to one another, which scissor arms are attached at their ends to a lower frame section and to an upper table section in such a way as to be capable of pivoting and rolling, and a centrally positioned power transmission arrangement pivotally attached to the frame section, being preferably a hydraulic clyinder, the piston rod of which is so arranged as to engage via rollers with guide curves, one of which is attached to the frame section, and the other is operatively connected to a pair of scissor arms, and which are moved towards and away from one another by means of the rollers for the purpose of raising the lifting table and vice versa.
In the case of such lifting tables of a previously disclosed kind, it is difficult to manoeuvre a load up onto the lifting table by hand using a so-called hand pallet truck; this is because the smallest difference in height between the upper surface of the lifting table and a level floor on which the lifting table is resting is so great that an inclined plane is necessary in order to equalize the difference in height. In the absence of special lifting equipment, it will be necessary, if the load weighs more than one is able to lift manually, to use the lifting table to lift both the hand pallet truck and the load.
The object of the present invention is to make available a hydraulic lifting table which permits the load, with the help of the hand pallet truck, to be placed on the lifting table, which is made possible by the table section having the form of a plain symmetrical `E`, in which the cross-pieces of the `E`-shape cover the pairs of scissor arms and the power transmission arrangement, by the guide curves being centrally positioned, i.e. in the vicinity of the hydraulic cylinder, and by the operative connection consisting of a shaft pivotally mounted in the frame section, which shaft constitutes the operative connection between the guide curve and the pair of scissor arms.
Accessibility is further increased through the table section having the form of a plain symmetrical `E`, in which the cross-pieces of the `E`-shape cover the pairs of scissor arms and the power transmission arrangement.
The fact that all the guide curves in accordance with a particular characteristic features are of identical profile means that the above-mentioned smallest difference in height is as small as possible.
The invention is described below in further detail with reference to the accompanying drawing, in which,
FIG. 1 illustrates in perspective view one embodiment of a lifting table in accordance with the invention, with the table in a raised position.
FIG. 2 is a perspective view which illustrates the lifting table in accordance with FIG. 1 in the collapsed state.
FIGS. 3 and 4 shows a cross-section through the lifting table in FIGS. 1 and 2.
A hydraulic lifting table in accordance with the invention comprises two articulated pairs of scissor arms 1, 2, a lower frame section 3 and an upper table section 4. The pair of scissor arms 1 is connected at its lower end in such a way as to articulate with the frame section 3, and is equipped at its upper end with rollers 5 by means of which the pair of scissor arms 1 rolls against the table section 4. The pair of scissor arms 2 is similarly conencted at its upper end in such a way as to articulate with the table section 4, and is equipped at its lower end with rollers 6 enabling it to roll against the frame section 3.
For the purpose of raising and lowering the lifting table there is provided a centrally positioned power transmission arrangement 7 which is pivotally attached to the frame section 3, being preferably a hydraulic cylinder, the piston rod 8 of which is equipped at its outer end with rollers 9. These are so arranged as to engage with guide curves 10, 11, one 10 of which is attached to the frame section 3, and the other 11 is operatively connected to the pair of scissor arms 1. A
REFERENCES:
patent: 2862689 (1958-12-01), Dalrymple et al.
patent: 3905494 (1975-09-01), Yatagai et al.
patent: 4534544 (1985-08-01), Heide
Hartman Judy J.
Hymo AB
Schmidt Frederick R.
LandOfFree
Hydraulic lifting table does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic lifting table, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic lifting table will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1911284