Chairs and seats – Bottom or back with means to alter contour – Providing support for lower back region
Patent
1997-11-17
1999-08-10
Cuomo, Peter M.
Chairs and seats
Bottom or back with means to alter contour
Providing support for lower back region
2972841, 2972849, 2972847, A47C 3025, A47C 746
Patent
active
059347520
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an elastic contouring element made of plastic with longitudinal and transverse struts for a lumbar support system having an adjustable curvature including a tensioning device, one end of which is connected to a contouring element by means of a fastening element and the other end of which is connected to a cam device for adjusting the curvature of the contouring element.
Such a contouring element is known from the DE-C1-43 20 105. The contouring element known from it requires additional parts with regard to its connection to the adjustment device and a considerable amount of assembly time.
It is the object of the invention to improve a contouring element for lumbar support in such a manner that it can be simply manufactured in a cost-effective way and that it can be assembled at low cost. It is a further object of the invention to attach a contouring element simply and quickly to a frame or a part of a frame of a back-rest without tools.
The first-mentioned object is achieved by a contouring element with the characteristics of claim 1. Advantageous embodiments of the invention can be seen in the subordinate claims.
Below, the invention is described in more detail on the basis of the example of an embodiment with reference to drawings. The following is shown:
FIG. 1A top view of a contouring element according to the invention,
FIG. 2 a cross-section through a contouring element according to FIG. 1,
FIG. 3 a tensioning device,
FIG. 4 a sectional view of a round peg with flat portions located opposite each other at the center portion and at the exposed ends.
The contouring element 1 consists of a truss-like structure with transverse struts 2 and longitudinal struts 3. In the example of the embodiment, in addition to a central strut 4 two further longitudinal struts 3 are arranged on either side of it and parallel to it, which form a central truss-like structure with the transverse struts 2, which connect them to each other, and where the entire structure can be curved around a horizontal axis by means of the longitudinal struts 3, 4. The transverse struts 2 protrude beyond this central truss-like structure on both sides and can be arranged at an angle to it in order to assure a lateral support. The contouring element 1 consists preferably entirely of plastic, while, however, support inserts made of any material desired, e.g. metal, and/or reinforcing ribs can be used. In order to save weight and/or to affect the bending properties and the stability and stiffness, recesses 5 can be provided. At the lower end of the contouring element 1 a shoulder 6 has been provided, which has been made an integral part of the contouring element 1.
In the example of the embodiment, the shoulder 6 is a part of a housing 7 for receiving and supporting an adjustment device. The adjustment device contains a rotatable disk 8, which can be supported in the housing 7, and which contains a cam 9, and where the disk 8 is firmly connected to or is an integral part of a gear with helical teeth, which is not shown, which meshes with a worm gear (not shown), which is supported in the housing 7, and where the worm gear is connected non-rotatably to a hand wheel 11 by way of an extension 10. The worm gear is turned by means of the hand wheel 11, which causes the gear and thus also the disk 8 along with the cam 9 to be rotated.
In the example of an embodiment the housing 7 consists of the shoulder 6 and a corresponding locking part 12, whose contour is shown in FIG. 1, partly as a dotted line. The shoulder 6 and the locking part 12 contain protrusions or recesses 13, 13', which are indicated, for example, in FIG. 2, and which function as guide means and/or snap connections for joining and holding together the shoulder 6 and the locking part 12 to form the closed housing 7, as soon as the disk 8, with the cam 9 and the helical gear as well as the worm gear with the extension 10 and the hand wheel 11 are inserted into the corresponding indentations or recesses in the shoulder 6 and in the locking part 12. The protrusions a
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AMEU Management Corp.
Cuomo Peter M.
White Rodney B.
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