Automatic device for index guiding a movable part pivotably moun

Chairs and seats – Movable back – Tiltable

Patent

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Details

29735412, B60N 202

Patent

active

061060682

DESCRIPTION:

BRIEF SUMMARY
The invention relates to an automatic device for index guiding a movable part pivotably mounted about an axis on a part considered to be stationary relative to this axis.
The invention relates more particularly, though not exclusively, to automatic devices for index guiding arm rests for seats such as vehicle seats, for example in automobiles.
In effect, on certain vehicle seats in particular, the arm rests must be able, in the position in which they are used by a person, to have their angular position precisely adjusted relative to a generally horizontal reference plane, and if necessary, to be retracted into a radically different position located substantially in the plane of the seat back that they equip.
The invention specifically relates to an automatic device for index guiding a movable part between at least two distinct angular positions delimiting at least two angular sectors, including a primary sector in which this same part, at least in a first direction of displacement toward one of the angular limits of this primary sector, can be displaced at least by an angular fraction of this sector, but without the capability to return directly in a second, opposite direction to any previously abandoned incremented position, due to its displacement in the first direction, and a secondary sector within which this movable part can be displaced freely.
Index guiding devices of the above-mentioned type exist, but they are not automatic, i.e., they include a manual control mechanism.
One object of the invention is to obtain an index guiding device of the above-mentioned type which is entirely automatic and which combines this characteristic with the reliability and durability of some of the non-automatic devices known in the prior art.
To this end, the invention relates to an automatic index guiding device that uses a rachet mechanism, that is, a mechanism essentially comprising a notched ramp in the form of a cylindrical case which is carried at least indirectly by one of the pivoting parts, and a ratchet that cooperates with the ramp and is itself carried by the other pivoting part.
The invention is particularly characterized in that: cooperate with the notched ramp, it comprises a part pivotably mounted about an axis substantially parallel to the rotational axis of the stationary and movable parts between a number of positions, including at least: position in which the ratchet has a toothed surface pressed tightly against the ramp, pivoted on its axis and has only one remaining tooth of its toothed surface in contact with the ramp, pivoted on its axis past the adjustment position, and no longer has any of the teeth of its toothed surface in contact with the ramp, the so-called fully engaged position of this surface against the notched ramp, is centered on the rotational axis of the movable part and does not include the pivot axis of the ratchet, and is disposed relative to an imaginary line passing through the rotational axis and the pivot axis in such a way that, and the ratchet is substantially in its fully engaged position against the ramp, it tends to disengage from the latter and to assume its adjustment position, and and the ratchet is in the adjustment position, it tends to disengage from the latter and to assume its fully engaged position against the ramp.
The invention will be clearly understood by means of the following description given as a non-limiting example with the aid of the appended drawings which schematically represent:
FIG 1: a side view of a device equipping the arm rest of a seat,
FIGS. 2 through 9: partial cutaway views of a device according to the invention that equips an arm rest,
FIGS. 10 through 21: views of details of the device of the invention,
FIG 22: a view in longitudinal section of a detail of embodiment of the invention,
FIG. 23: a cross-sectional view of the device of FIG. 22,
FIG. 24: a view in longitudinal section of a detail of embodiment of the invention,
FIG. 25: a cross-sectional view of the device of FIG. 24,
FIG. 26: in larger scale, a detail of a variant of emb

REFERENCES:
patent: 4103970 (1978-08-01), Homier
patent: 4188064 (1980-02-01), Cheshire
patent: 4684174 (1987-08-01), Bell
patent: 5664836 (1997-09-01), Takagi
patent: 5785386 (1998-07-01), Yoshida

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