Chairs and seats – Movable back – Tiltable
Patent
1991-03-08
1993-05-18
Brittain, James R.
Chairs and seats
Movable back
Tiltable
297317, 297322, 297342, A47C 102
Patent
active
052114449
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a locking mechanism for a piece of seating furniture that is continuously foldable, comprising a cylindrical bushing, which is fixed to the frame of the piece of seating furniture, preferably to its arm part, and which is provided with a pair of diagonally arranged holes for an upwards inclined carrier bar, which is fixed to the seat part of the piece of seating furniture and which forms an acute angle open towards the front of the piece of seating furniture with the main plane of the seat part, and comprising a locking member jointly operative with the carrier bar as well as a control member acting upon the locking member.
BACKGROUND OF THE INVENTION
Prior-art locking mechanisms of this type are usually operated by means of a control screw, by whose means the mobility and thereby the foldability of a piece of seating furniture can be locked and gradually released. It is a drawback of this prior-art type of locking mechanism that from the lowered rest position the piece of seating furniture cannot be brought back to the normal sitting position without first releasing the locking mechanism, i.e. screwing on the control handle. When the piece of seating furniture is in the rest position, rising from this is quite difficult, because its seat part has then been pushed forward and is in a markedly raised position, at the same time as the back part has been lowered strongly rearwards.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention is to eliminate the above drawbacks, which is achieved by means of a locking mechanism which is characterized in that the diagonally arranged holes are, at least in the peripheral direction, considerably larger than the cross section of the carrier bar, that inside the first bushing a second, inner bushing, preferably made of plastic, is fitted freely turnably, that the inner bushing is provided with diagonally placed holes which are fitted tightly around the carrier bar and is provided with a closed end against the arm part, that the locking member, which comprises a plane metal piece with a central through hole or cavity for the carrier bar, is arranged inside the inner mobile bushing with one of its ends pivotally mounted in the mantle of said bushing and is spring-loaded in the direction towards the front of the piece of seating furniture for locking of the movement of the carrier bar in this direction, and that the control member is mounted in an end wall of the inner bushing in a position next to the front side of the free end of the locking member, being arranged to press the free end of the locking member rearwards by the effect of an external force, whereby the carrier bar is made free.
By means of the solution in accordance with the present invention, a locking mechanism is obtained which permits shifting of the carrier bar rearwards irrespective of the position of the control member, whereby the seat part and the back part of the piece of seating furniture are brought to the normal sitting position, but for continuous lowering to the desired rest position it is required that the locking member of the locking mechanism is first released by means of easy operation of the control member.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described in more detail with reference to the accompanying drawing, wherein
FIG. 1 is a side view of an exemplifying embodiment of a locking mechanism in accordance with the invention,
FIG. 2 is a sectional view of the locking mechanism taken along the line A--A in FIG. 1,
FIG. 3 shows an exemplifying embodiment of a piece of seating furniture provided with a locking mechanism in accordance with the invention, the piece of seating furniture being shown in the normal sitting position as well as in a lowered rest position.
The locking mechanism in accordance with the invention comprises a cylindrical bushing 3, which is fixed to the frame 1 of the piece of seating furniture, preferably to its arm part 2, and which is provided with a p
REFERENCES:
patent: 2611421 (1952-09-01), Hathaway
patent: 2675861 (1954-04-01), Cushman
patent: 3773383 (1973-11-01), Ekornes
patent: 3947069 (1976-03-01), Lusch
patent: 4387926 (1983-06-01), Van Eerden et al.
patent: 4457406 (1984-07-01), Porter
patent: 4552405 (1985-11-01), Wiers
patent: 4592591 (1986-06-01), Wiers
patent: 4660884 (1987-04-01), Terui et al.
Ab BD Produkt Oy
Brittain James R.
Jr. Milton Nelson
Mekrapid
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