Chairs and seats – Movable bottom – Tiltable
Patent
1988-08-16
1990-01-02
McCall, James T.
Chairs and seats
Movable bottom
Tiltable
248596, 248632, 297302, A47C 102
Patent
active
048908860
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tilting mechanism, preferably for a chair seat or similar article, comprising a rigid element which via a mounting means can be attached to a chair base, a supporting means adapted to the chair seat and pivotably connected in relation to said mounting means, resilient means so arranged between said supporting means and said rigid element that said supporting means can be tilted in relation to said rigid element under the influence of said resilient means, as well as locking means for adjusting said seat supporting means to various tilting positions.
From German Offenlegungsschrift No. 2.022.525 there is known a tilting means, wherein an elastic body is arranged on each side of a tilting shaft, each of said bodies dampening the tilting movement of an upper movable plate, which for example can carry a chair seat, in relation to a stationary rigid plate. It is true that in said Offenlegungsschrift it is suggested that one of the elastic bodies can have a different distance from the tilting shaft in relation to the second elastic body, but in said patent publications no hints are given of how such a distance can be adjustable, let alone continuously adjustable for said pair of elastic bodies for thereby providing a simple and expedient adjustment of the dampening of the tilting movement. The prior art elastic bodies are arbitrarily arranged between said two plates and are held in position by means of friction between their upper surfaces and the opposite surfaces of said plates. The solution according to the German patent publication is space requireing, and no locking function is achieved in the various tilting positions.
From GB patent publication No. 1.324.451 there is known a tilting mechanism for a chair, comprising a fixed plate and a tilting plate, said two plates being interconnected by means of a resilient hinge comprising a pair of resilient means which co-operate with the upper side and the lower side of the fixed plate, respectively.
Besides, the tilting movement is controlled by a pre-tightening means which can be adjusted in relation to how soft or how stiff the tilting movement should be. However, this patent publication does not give any instructions for any resilient means which can be displaced for the purpose of adjusting the resistance against the tilting movement, let alone instructions for making these resilient means individually displaceable or adjustable.
Further, from Norwegian patent application No. 84.1843 there is known a tilting mechanism of the type as stated in the preamble, wherein a the front of and at a distance from the pivoting shaft of the tilting mechanism there are provided elastic resilient means, one of said means being provided on the upper side of the rigid plate, whereas the second means is provided on the lower side of the rigid plate, said means being arranged co-axially and being attached to the rigid plate by means of a threaded bolt which fixes the position of the resilient means in relation to said pivoting shaft.
In connection with the tilting arrangement according to Norwegian patent application No. 84.1843 the degree of compensation and thereby the stiffness of the tilting of the seat is effected by means of an adjustment device provided at the lower end of said threaded bolt, an adjutment which entails that the seat angle is changed by the adjustment, for example by having the forward portion of the seat pulled downwardly uppon tightening of said adjustment device. Thus, the prior art adjustment device does not give any instructions for how to achieve different tilting stiffness for tilting forwardly and tilting rearwardly, and then without screwing and without the risk of having the original seat angle changed during the adjustment.
Accordingly, the present invention has for an object to provide a tilting mechanism of the type stated in the preamble, which has a compact design, and which also renders an individual adjustment of the tilting stiffness in the forward or rearward direction, and at the same time avoiding any
REFERENCES:
patent: 2184988 (1939-12-01), Collier et al.
patent: 3770235 (1973-11-01), Klapporth et al.
McCall James T.
Peter Opsvik A/S
LandOfFree
Tilting mechanism, preferably for a chair seat or similar articl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tilting mechanism, preferably for a chair seat or similar articl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tilting mechanism, preferably for a chair seat or similar articl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1380459