Beds – Bedsteads – Having bottom
Patent
1989-06-26
1991-10-29
Trettel, Michael F.
Beds
Bedsteads
Having bottom
5241, A47C 2300
Patent
active
050603264
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a bed, in particular a bed with a box-like frame having longitudinal frame parts and transverse frame parts joined to them and slats attached thereto, on which a mattress can optionally be placed.
Beds conventionally used to the present day normally have a bed frame, on the upper longitudinal frame parts of which are attached slats that have resilient properties and in general are made of especially glued wood. On the longitudinal frame parts, the slats are rotatably supported in pockets made of plastic and secured to the longitudinal frame parts, and as a result are to a certain extent capable of adapting to the weight of the person resting on them, by flexing slightly. Optionally, the slats may themselves be supported at their ends via their own spring elements on the longitudinal frame parts. Instead of the slats, springs can be attached to the frame, which permit resilient flexing.
This is not optimal, because beds with slats have the problem that a precise resiliency of the slats adapted to the body cannot be attained. In experiments, it has been found that the loads on the bed or on the individual slats varies, depending on which part of the body is observed. The buttocks, for instance, press more heavily on the slats than the upper torso, and the load on the slats from the legs is likewise considerably less than that in the area of the buttocks. The situation is similar with spring supports.
Accordingly, a rather thick mattress, either of foam rubber or one with box springs, must be laid on the slats in all of these kinds of beds, because only in this way is an at least somewhat even distribution of the weight of the human body possible, while avoiding pressure points on particular parts of the body. However, it would be advantageous to use a thin mattress, as much of possible of natural materials (natural fibers such as coconut fibers, horsehair, seaweed), for the sake of good ventilation from underneath, which is hardly possible with present conventional mattresses. Yet such relatively thin mattresses can hardly be used with present bed constructions.
The object of the invention is to improve a bed of the type described at the outset above in such a way that this variable load by the different parts of the human body is appropriately taken into account.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a bed with a box-like frame having longitudinal frame parts and transverse frame parts joined to them and slats attached thereto, on which mattress can optionally be placed; at least some of the slats are supported on their ends in the vicinity of the longitudinal frame parts by means of a piston/cylinder mechanism on the longitudinal frame parts; and the hydraulically or pneumatically operative chambers in the piston/cylinder mechanisms communicate with one another hydraulically or pneumatically, so that the slats adjust to various heights in the vertical direction depending on the distribution of weight of a human body resting on them.
Because of the hydraulic connection of the hydraulically active chambers within the individual piston/cylinder mechanisms, an exact and precise adaptation of the location of the individual slats is attained in that by the compensation among the individual operative chambers of the piston/cylinder mechanism, an exact and precise adaptation to the contour of the human body is produced. That is, in contrast to springs, in which a spring characteristic is still considerable, the individual piston/cylinder mechanisms have an effect on one another, particularly since where the load due to the human body or body contour is the greatest, it is balanced by the load in the regions in which the weight on them is the least. Depending on the placement of the human body and on the position--whether supine or crosswise--a variable adjustment of the individual slats is obtained.
Because of this fine adaptation to the body contour, which is already highly advantageous per se because of the relief on the spinal
REFERENCES:
patent: 4525886 (1985-07-01), Savenije
patent: 4682378 (1987-07-01), Savenije
patent: 4799276 (1989-01-01), Kadish
Greenberg Laurence A.
Lerner Herbert L.
Trettel Michael F.
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