Chairs and seats – Movable bottom – Bottom and back movable as a unit
Reexamination Certificate
1999-11-12
2001-10-16
Cuomo, Peter M. (Department: 3636)
Chairs and seats
Movable bottom
Bottom and back movable as a unit
C297S344220
Reexamination Certificate
active
06302483
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a revolving seat, in particular for a rail vehicle.
The prior art already discloses a seat of the type comprising a moveable upper part for receiving at least one occupant, the said moveable upper part being carried by a fixed lower part forming a substructure and means for turning the upper part backwards and forwards.
The seats of this type are arranged, in particular, in rail vehicles. The means for turning a seat make it possible to reverse the front/back orientation of the seat so as to place this seat and the passenger or passengers occupying it in the direction of travel of the vehicle, whatever the direction in which this vehicle makes a journey.
Conventionally, the seats of a rail vehicle are arranged in the vicinity of a left-hand or right-hand side wall of this vehicle.
Since the space between the seats and the adjacent side wall is preferably as small as possible, the movement of turning a seat backwards (and forwards) simply by rotating the moveable upper part of the seat about a fixed vertical axis is impeded by the side wall. The seat is therefore usually turned first by moving the moveable upper part away from the wall adjacent to the seat, then by rotating this moveable part about a vertical axis and finally by bringing this moveable part close to the wall adjacent to the seat.
BRIEF SUMMARY OF THE INVENTION
The object of the invention is to provide a seat, in particular for a rail vehicle, equipped with turning means of small overall size which are light and simple to operate, in order to make it possible to reverse rapidly the front/back orientation of all the seats of a rail vehicle.
For this purpose, the subject of the invention is a seat of the abovementioned type, characterized in that the turning means comprise a pivot connecting the upper part and the substructure, the axis of this pivot being substantially vertical and connected to the substructure, a bearing-forming slide mounted on the upper part so as to be displaceable in rotation about the pivot and in translational motion substantially perpendicular to the axis of this pivot, and two complementary cams carried respectively by the substructure and the upper part, one of these cams comprising a developing profile imparting a predetermined turning travel to the upper part.
According to other characteristics of this seat:
a first cam forms a finger integral with the substructure, and the second cam forms a guide having a developing profile and formed in the upper part, this guide extending substantially parallel to a plane perpendicular to the axis of the pivot;
the guide comprises two straight end portions forming ramps imparting to the upper part displacements occurring as a result of a combination of a rotational movement about the axis of the pivot and of a translational movement substantially perpendicular to this axis of the pivot, and a curved intermediate portion imparting to the upper part a displacement in rotation about the axis of the pivot;
the seat comprises releasable means for locking the upper part relative to the substructure;
the locking means comprise means for clamping two mutually confronting friction faces substantially perpendicular to the axis of the pivot and delimiting respectively the upper part and the substructure, these clamping means being carried by the pivot;
the pivot extends through mutually confronting walls of the upper part and of the substructure carrying the friction faces, and the clamping means comprise an end head of the pivot, the said end head forming a fixed jaw, and a moveable jaw mounted axially slideably on the pivot, the mutually confronting walls extending between the fixed jaw and the moveable jaw, the moveable jaw being elastically deformable axially and being displaceable between a decompressed position separating the friction faces and a compressed position clamping these friction faces;
the moveable jaw is displaceable and compressible axially by co-operation with a cam articulated on the pivot about an axis substantially perpendicular to that of this pivot;
the cam forms the end of a lever controlling the locking means;
the friction face of the upper part comprises rolling members, preferably balls, displaceable substantially parallel to the axis of the pivot between the projecting position spacing apart the mutually confronting friction faces, in which position these members are in rolling contact with the friction face of the substructure, and the retracted position putting the mutually confronting friction faces into contact, the rolling members being returned elastically to the projecting position.
The subject of the invention is also a rail vehicle comprising a seat as defined above.
REFERENCES:
patent: 1735321 (1929-11-01), Kilburn
patent: 1741784 (1929-12-01), Lucas
patent: 2247264 (1941-06-01), Van Derveer
patent: 3066979 (1962-12-01), Pitts et al.
patent: 3394964 (1968-07-01), Humphries et al.
patent: 4417715 (1983-11-01), Edwards
patent: 4822099 (1989-04-01), Negi et al.
patent: 4824170 (1989-04-01), Goldmeier
patent: 5046782 (1991-09-01), Lundeen
patent: 5634537 (1997-06-01), Thorn
patent: 5636884 (1997-06-01), Ladetto et al.
patent: 6027170 (2000-02-01), Benz et al.
Mormede Bernard
Ricaud Patrick
Alstom Holdings
Cuomo Peter M.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Vu Stephen
LandOfFree
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