Supports – Resilient support – Including spring zone understructure
Patent
1997-04-04
1998-09-22
Ramirez, Ramon O.
Supports
Resilient support
Including spring zone understructure
108147, 248421, 248631, A47B 900
Patent
active
058103201
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a weight-balancing stand arrangement and then particularly, but not exclusively, to a weight-balancing stand arrangement which is constructed to support a sheet or slab of material, wherein the stand functions to raise and lower the sheet of material with the same or essentially the same force, which acts at least in the direction of sheet movement.
The sheet of material may have the form of a table leaf or table top, a work bench or some like device, although the form taken by the sheet of material and its purpose have no significance to the invention.
The invention finds particular application when the sheet of material is intended to support various pieces of apparatus and devices where the weight exerted by the apparatus and devices on the sheet will vary from time to time and is distributed differently over the surface of said sheet.
An inventive weight-balancing stand arrangement is comprised of a bottom stand-part and a top stand-part, wherein the bottom stand-part has a form which is related to the top stand-part so that said parts can be raised and lowered relative to one another and therewith raise or lower the sheet supported thereby.
The stand arrangement also includes an activatable and deactivatable locking device which is able to adopt automatically a locking state at each selected positional setting of respective stand-parts, among other things so as to be able to support loads on the sheet without the forces generated thereby being able to change the relative positional settings of the stand-parts, and can be brought manually to a release position in which the sheet can be raised or lowered together with the upper stand-part from said selected positional setting to a new positional setting, at each selected positional setting of the stand-parts.
The stand arrangement also includes at least one weight-balancing spring means which when the top stand-part is raised or lowered functions to change the force required herefor, i.e. reduces the force required to raise the top frame part in relation to the bottom frame part, and vice versa, therewith enabling the top frame part to be raised or lowered in relation to the bottom frame part with essentially the same force in the anticipated direction of movement.
DESCRIPTION OF THE PRIOR ART
Weight-balancing stand arrangements of the aforedescribed kind are known to the art in several different forms.
For instance, one known weight-balancing stand arrangement includes leg devices which cross one another between the bottom stand-part and the top stand-part of said stand arrangement.
With the intention of equalizing weight and/or balancing weight in stand arrangements of the aforesaid kind, it is known to use spring means that are compressed and expanded in accordance with vertical movement of the sheet supported by the stand.
It is also known to use spring means in the form of one or more gas-spring devices.
As an example of the known prior art, reference is made to the teachings of U.S. Pat. No. 4,558,648.
This patent specification teaches a weight-balancing stand arrangement in which a bottom stand-part and a top stand-part are mutually connected through the medium of scissor-like leg means and where a gas-spring device is provided for relieving forces that would otherwise occur when raising or lowering a sheet supported by the stand.
The specification refers to the possibility of storing the energy recovered when lowering said sheet and the forces exerted by apparatus and the like supported by the sheet by compressing a gas volume, and to utilize the stored energy to raise the sheet and said apparatus from a lower position to a higher position with the aid of a smaller lifting force than would have otherwise been required.
Stand constructions are also known which have vertical and mutually parallel telescopic legs by means of which a stand-supported sheet of material can be raised and lowered to different positional settings.
Stand constructions are also known in which a stand-supported sheet can
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Berger Derek J.
Kinnarps AB
Ramirez Ramon O.
LandOfFree
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