Chairs and seats – Headrest – Angularly movable about horizontal axis
Patent
1992-08-25
1994-11-15
Cuomo, Peter M.
Chairs and seats
Headrest
Angularly movable about horizontal axis
297391, 16334, A47C 736
Patent
active
053641647
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Headrest for Seats
TECHNICAL FIELD
The present invention relates to a headrest used in various seats for airplanes, ships, rail road vehicles and so on, which is capable of tilting forward its supporting surface for supporting a rear head region of a person seated on a seat within a predetermined angle range.
BACKGROUND ART
Conventionally, there has been known a seat used for airplanes, ships, rail road vehicles and so on which consists of a seat back 51 having a top portion equipped with a headrest 52 hingedly supported on a hinge point 53 so as to be tiltable forward with respect to the seat back 51.
However, in the above conventional case, all of the headrest 52 is constituted to be tiltable forward with respect to the seat back 51 by being tilted about the hinge point 53. Therefore, in the case where some passengers walk an aisle in an airplane by holding the headrests 52 which are tilted forward, there is a problem such that the headrests 52 moves unintentionally and causes a passenger seated on the seat trouble.
Furthermore, when a passenger room of an airplane is cleaned up or a passenger car of a train is cleaned up at a terminal station, if numerous headrests of seats are tilted forward, it requires a large manpower to return these headrests to their original positions, and also it would be a time-consuming work.
The present invention has been done in view of the above problems and disadvantages encountered in the prior art, and has an object to provide a headrest for seats in which only an upper central portion of a seat back is capable of tilting forward so as to be used as a headrest, and capable of automatically returning this headrest to its original position by tilting it forward more than a predetermined angle with respect to the seat back.
DISCLOSURE OF INVENTION
In accordance with the present invention there is provided a headrest for seats which is retractably installed with respect to a recessed portion formed on an upper portion of a seat back and is swingably supported by means of a hinge mechanism equipped with a ratchet mechanism. And, said hinge mechanism includes a movable hinge portion fixed on a lower portion of a supporting frame of a headrest, and a hinge main body fixed on a seat back frame so as to be hingedly supported on a rotational shaft together with the movable hinge portion. And further, there is provided a return spring together with the supporting frame of the headrest to return the headrest to its raised position. Moreover, said ratchet mechanism is constituted in such a manner that, when the headrest is tilted forward beyond a predetermined angle, its ratchet gear is disengaged from its ratchet claw member so that the headrest can be returned to its original position by the pulling force of the return spring.
With the above arrangement, it becomes possible to adjust an angle of the headrest stepwisely when the seat back is tilted forward. Therefore, since the headrest supports a rear head region of a person seated on a seat perfectly, it becomes possible to prevent a neck region and an abdominal region from being tired so much. Especially, the headrest is constituted so as to tilt forward and rearward in the recessed portion formed on the upper portion of the seat corresponding to a rear head region of a passenger through the hinge mechanism. Therefore, even if a passenger walking an aisle in an airplane holds an upper portion of a seat unexpectedly, his or her hand is prevented from directly touching the headrest. Therefore, the headrest is not unexpectedly moved and, thus, it is surely avoided to cause the person seated on the seat trouble.
Moreover, if the tilted headrest is further tilted down to the lowest end, it can be easily and accurately returned to the original position by the pulling force of the return spring equipped in the hinge mechanism. Therefore, it becomes possible to promptly and easily clean up a passenger room of an airplane or a passenger car of a train at a terminal station.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1
REFERENCES:
patent: 2869622 (1959-01-01), Petersen et al.
patent: 3484831 (1969-12-01), Higuchi
patent: 4370898 (1988-02-01), Maruyama
patent: 4674797 (1987-06-01), Tateyama
patent: 5145233 (1992-09-01), Nagashima
Boucher Darnell M.
Cuomo Peter M.
Greigg Edwin E.
Greigg Ronald E.
Koito Industries Ltd.
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