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https://patents.google.com/patent/US3668720A/en
A mattress support structure of the type having a mattress thereon with the mattress having a central opening and means associated with the support structure and mattress to change the configuration of the opening from closed to open position and with a waste receptacle position below the opening in the mattress.Cited by: 6
https://patents.google.com/patent/US4224705A/en
An adjustable support for accommodating waterbed mattresses of a variety of sizes. The adjustable support comprises a pair of spaced apart upstanding side rails interconnected by an accordion type collapsible construction which enables the side rails to be variably positioned a desired distance apart depending upon the size of the mattress to be supported.Cited by: 10
https://patents.google.com/patent/US6131218A/en
A playpen having a rectangular frame with four upper support bars, and four positioning brackets each secured between two of the four upper support bars. An upper mattress support device for the playpen having a flexible support received in the frame and an upper periphery enclosing each of the upper support bars, a plurality of support members each secured on the flexible support, an upper ...Cited by: 54
https://patents.google.com/patent/US6739009B2/en
Supporting device, notably mattress, mattress support or supporting device for seats, comprising several elements comprising flexible fluid-holding chambers aligned vertically and assembled in a network so as to form a structure enabling a body to rest. The pressure in each fluid-holding chamber is transmitted insider first conduits ( 4 ) coming out of said chamber.Cited by: 11
http://europepmc.org/patents/PAT/US3840909
In combination with a bed having a horizontal rectangular frame with side and end pieces and a mattress resting on top: first and second vertical members; first and second clamp means, each means being detachably secured to a corresponding side piece, both means being disposed adjacent a ...
http://www.freepatentsonline.com/3840909.html
Oct 15, 1974 · My invention is directed toward a mattress support which can be used to raise one end or the other of a mattress inclinedly upward without raising the body of the mattress whereby a user can have his legs or head raised while lying on the mattress. The advantages of mattress support …
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