US3551924A - Variable firmness sleep unit - Google Patents

Abstract

A SLEEP UNIT INCLUDING A RESILIENT MATTRESS HAVING VERTICALLY MOVABLE SUPPORT RODS EXTENDING THERETHROUGH AND RESILIENTLY BIASED AGAINST DOWNWARD MOVEMENT IMPARTED THERETO BY A RECLINING BODY ON THE MATTRESS. VERTICALLY MOVABLE MEANS UNDERLYING THE SUPPORT RODS IS OPERABLE TO VARY THE BIAS AGAINST THE SUPPORT RODS, THE RODS HAVING FLEXIBLE HEAD ELEMENTS MOUNTED ON THEIR UPPER ENDS FOR UNIVERSAL TILTING MOVEMENTS RELATIVE TO THE AXES OF THEIR RESPECTIVE SUPPORT RODS.

Description

Jan. 5, 1971 J, E, 5 3,551,924

VARIABLE FIRMNESS SLEEP UNIT Filed May 19, 1969 3 Sheets-Sheet l \1\ aw 1\ max?l 47 INVENTOR, 4y 444 43 JAMES FRYEQ'SR. 19 44 BY Jan. 5, 1971 J. R. FRYE. SR 3,551,924

VARIABLE FIRMNESS SLEEP UNIT Filed May 19, 1969 I 3 Sheets-Sheet 2 INVENTOR.

J FRYE R I ATTORNEYS Jan. 5, 1971 J. R. FRYE. SR 3,551,924

VARIABLE FIRMNESS SLEEP UNIT Filed May 19, 1969 v S-SheetS-Sheet 5 FIG. 5

I NVENTOR.

JAMES R-FRYE, Sn,

AT TOP/V5 Y5 3,551,924 VARIABLE FIRMNESS SLEEP UNIT James R. Frye, Sr., Box 98, Lakeside, Mont. 59922 Filed May 19, 1969, Ser. No. 825,789 Int. Cl. A47c 27/08, 23/00 US. Cl. -345 9 Claims ABSTRACT OF THE DISCLOSURE A sleep unit including a resilient mattress having vertically movable support rods extending therethrough and resiliently biased against downward movement imparted thereto by a reclining body on the mattress. Vertically movable means underlying the support rods is operable to vary the bias against the support rods, the rods having flexible head elements mounted on their upper ends for universal tilting movements relative to the axes of their respective support rods.

BACKGROUND OF THE INVENTION This invention is in the nature of an improvement on the device disclosed and claimed in my prior U.S. Letters Pat. 3,252,170, issued May 24, 1966, and other types of variable firmness units utilizing springs which are not always of uniform compressive strength, which are more expensive to produce, and which require special mounting or anchoring facilities to hold the same against lateral movement.

SUMMARY OF THE INVENTION The present invention involves the use of a resilient foam mattress disposed on a stationary platform, a resilient pad overlying the mattress, and a plurality of generally vertical support rods extending through the mattress and platform and vertically slidable therein. Each support rod is provided at its upper end with a generally flat-topped flexible head element disposed between the mattress and overlying pad and mounted on its respective support rod for universal tilting movements; each support rod being provided at its lower end with a shoe element disposed below the platform. Vertically movable means, disposed below the platform, is provided with resilient means movable toward and away from engagement with the shoe elements to vary upward bias of the resilient means against the support rods. The vertically movable means comprises one or more flat base plates having means for raising and lowering the same. In the embodiment of the invention herein illustrated, the several base plates are movable independently of each other when desired, each base plate and its respective resilient means, in the nature of a block of elastic foam cushioning material, engaging an independent group of the support rods, so that firmness of the unit may be varied in different areas or Zones thereof. The universal tilting mounting of the heads on the support rods enables the heads to closely follow the varying contours assumed by the top of the unit when a user reclines thereon.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in perspective of a variable firmness sleep unit produced in accordance with this invention, some parts being broken away and some parts being shown in section;

FIG. 2 is an enlarged transverse section taken substantially on the line 2-2 of FIG. 1;

FIG. 3 is a view partly in plan and partly in horizontal section, taken on the line 3-3 of FIG. 2, on a reduced scale;

1 United States Patent O "ice FIG. 4 is a view partly in bottom plan and partly in section, taken on theline 44 of FIG. 2, on a reduced scale;

FIG. 5 is an enlarged fragmentary longitudinal section taken substantially on theline 55 of FIG. 2;

FIG. 6 is an enlarged fragmentary section taken on the line 66 of FIG. 3; and

FIG. 7 is an enlarged fragmentary view partly in side elevation and partly in axial section, of one of the support rod assemblies of this invention.

DETAILED DESCRIPTION In the embodiment of the invention illustrated, an elongated generally rectangular frame, indicated generally at 1, is shown as comprising a pair of laterally spaced parallel side frame members '2, transverseend frame members 3 and a horizontally disposedplatform 4 overlying theframe members 2 and 3 and rigidly secured thereto. A rigidmarginal shelf 5 encompasses the frame 1, being rigidly secured to the side andend frame members 2 and 3 and projecting laterally outwardly therefrom. Theshelf 5 is reinforced by a plurality ofunderlying gussets 6 rig-idly secured thereto and to the side andend frame members 2. Themarginal shelf 5 supports abolster 7 that encompasses theframe members 2 and 3, thebolster 7 being covered with suitable fabric or other flexible coveringmaterial 8. Thebolster 7 is preferably in the nature of blocks or bars of elastic foam cushioning material, such as flexible polyurethane foam held in place by the fabric covering 8 that is tacked or otherwise secured to theshelf 5 andplatform 4. At its bottom portion, the frame 1 is reinforced by a plurality of plate-like support members 9 that are rigidly secured to theside frame members 2 byangle brackets 10 screwed or otherwise anchored to thesupport members 9 andside frame members 2, see FIGS. 2 and 3.

A relatively thick softresilient mattress 11 rests upon theplatform 4 andbolster 7, themattress 11 being preferably formed from elastic foam cushioning material, such as flexible polyurethane foam, and has formed therein a plurality of laterally and longitudinally spacedopenings 12 extending vertically therethrough and aligned withcorresponding openings 13 through theplatform 4. A relatively thin softresilient mattress structure 14 overlies themattress 11 and comprises abottom layer 15 of elastic foam material, a sheet of flexible moisture-proof material 16 overlying thebottom layer 15 and preferably adhered thereto, and a top layer 17 of elastic or resilient foam cushioning material overlying thesheet 16. Preferably, themattress 11 is adhered to theplatform 4, the layers 15-17 loosely resting on themattress 11. Themattress 11, with the layers 1517 are releasably held together by afabric cover 18 having an inturnedmarginal portion 19 that is tucked inwardly between themattress 11 and the underlyingbolster cover 8. Preferably, the inturnedmarginal portion 19 is provided with ahem 20 that encloses an elastic cord 21 which holds thecover 18 taut over themattress 11 and layers 1517, see particularly FIG. 2.

A plurality ofrigid support rods 22 are each loosely axially disposed in a different one of themattress openings 12 andcorresponding openings 13 in theplatform 4, each of thesupport rods 22 including aball portion 23 at its opposite ends, a reducedneck portion 24 adjacent eachball portion 23, and atapered shoulder portion 25 between theneck portions 24 and the main body portions of eachsupport rod 22, see particularly FIG. 7. Eachsupport rod 22 is provided at its upper end with a generally flat-toppedflexible head element 26 comprising a flange portion 27 the lower surface 28 of which slopes generally upwardly and radially outwardly from a central hub portion 29 to provide a thinmarginal edge 30. The

central hub portion 29 defines a downwardly openingsocket 31 for reception of theadjacent ball 23 of itsrespective support rod 22. Preferably, eachhead element 26 is molded from flexible plastic resin, such as polyethylene, theadjacent ball 23 being snapped into thesocket 31 to be held therein against accidental removal therefrom. The ball and socket connection between eachhead element 26 and itsrespective support rod 22 permits thehead element 26 to partake of universal tilting movements with respect to the axis of itscorresponding support rod 22. With reference particularly to FIGS. 2 and 5, it will be seen that eachhead element 26 is disposed between the top surface of themattress 11 and theoverlying foam layer 15, the central hub portions 29 being of a size to be loosely received in theirrespective mattress openings 12. Thesupport rods 22 are provided at their lower ends withshoe elements 32 which, for the purpose of the present example, are identical to thehead elements 26 and which are swively mounted on theball portions 23 at the lower ends of thesupport rods 22. The length of eachsupport rod 22 is such that theshoe elements 32 closely underlie theplatform 4 when the sleep unit is unoccupied, as shown in FIG. 2. It will be appreciated that, while the head andshoe elements 26 and 32 are shown in FIGS. 1 and 4 respectively as being round or disk-like in outline, these may be of any desired shape, such as polygonal. When the sleep unit is unoccupied, thehead elements 26 are disposed in a common plane and slightly embedded in the top surface of themattress 11, so that thetop mattress structure 14 is flat and even, as shown in FIGS. 1 and 2. It will be further noted that all of themattress openings 12 and thesupport rods 22 therein are inwardly spaced from the marginal edges of the mattress, 11, so that all of theshoe elements 32 are disposed within the confines of theframe walls 2 and 3. With the structure thus far described, when a person reclines on the sleep unit, the portions of themattress 11 andtop mattress structure 14 underlying the occupant become depressed in a manner to conform to the contours of the body of the occupant, see FIG. 5. When this occurs, thehead elements 26 swivel or tilt on theirrespective support rods 22, so that the top surfaces of thehead elements 26 collectively conform to the contour of the top surface of sleep unit. As shown, thehead elements 26 are disposed in closely-spaced relationship, the close spacing and flexibility of thehead elements 26 and the tilting connection therebetween and thesupport rods 22 cooperating with theupper mattress structure 14 to assure a comfortable sleeping surface for the user.

Vertically movable means, disposed within the frame 1 between theplatform 4 and plate-like support members 9, comprises a plurality of flat horizontal base members orplates 33, each thereof having mounted thereon resilient means in the nature of a block orslab 34 of elastic foam cushioning material, such as flexible polyurethane foam. Thebase members 33 are mounted and guided for independent vertical movement within the frame 1 by vertically disposedend guide rails 35 secured to theend frame members 3, andintermediate guide rails 36 suitably anchored at their upper and lower ends to theplatform 4 and supportmembers 9 respectively. Thebase members 33 are each reinforced by a pair ofelongated brace members 37 secured to the undersurface thereof, each of thebase members 33 and its respectiveresilient slab 34 underlying a different area of themattress 11 and respective groups ofsupport rods 22, to divide the mattress area inwardly of the marginal edges of the mattress structure into a plurality of zones.

Each of thebase members 33 is independently vertically movable toward and away from the engagement of its respectiveresilient slab 34 with overlying ones of theshoe elements 32 by independent lifting means now to be described. The lifting means for theseveral base members 33 are identical, and description of one thereof will apply equally to the others thereof. A conventional motor, preferably of the geared head type, is indicated at 38,

4 and is mounted on arespective support member 9 and has mounted on its output shaft 39 asprocket wheel 40 over which is entrained anendless drive chain 41 that is also entrained over a pair of spacedsprocket wheels 42 rigidly mounted on respective ones of a pair of elongated drive screws 43 journaled inbearings 44 secured to theunderlying support member 9. Entrainment of thechain 41 over thedrive sprocket 40 is maintained by a pair ofidler rolls 45 rotatably mounted on abracket 46 bolted or otherwise secured to theunderlying support member 9. A pair of travelingnut elements 47 are screwthreaded on each of the drive screws 43 in axially spaced relationship thereon. Pairs of bifurcated toggle-actinglinks 48 have their inner or lower ends pivotally secured each to a different one of thenut elements 47 and their upper or outer ends pivotally secured to adjacent ends of thebase members 37, as indicated at 49 and 50 respectively. Each of the drive screws 43 have axially spaced threaded portions of opposite hand, the travelingnuts 47 on each screw being correspondingly threaded, so that rotation of adrive screw 43 in one direction will impart axial movements to its travelingnuts 47 in directions axially away from each other, rotation of thedrive screw 43 in the opposite direction imparting movements of itsrespective traveling nuts 47 toward each other. Eachmotor 38 is of the reversing type and is connected in conventional circuit means, not shown, but including apower lead 51, shown fragmentarily in FIG. 4, and switching means enclosed within aswitch box 52 mounted on the end of aflexible conductor cable 53. Acleat 54 is mounted on one of theside frame members 2 for carrying theconductor 51 during transport or storage of the sleep unit. As shown in FIG. 2, eachmotor 38 is operative to move itsrespective base member 33 between a lowered position shown by full lines in FIG. 2 and a fully raised position indicated by dotted lines in FIG. 2 and wherein its respectiveresilient slab 34 engages theadjacent shoe elements 32. The arrangement is such that eachbase member 33 may be stopped and held in any desired position of its vertical movement between its fully raised and lowered positions. The circuit for eachmotor 38 includes a pair oflimit switches 55 and 56 operated by a switch actuator 57 carried by one of the travelingnut elements 47, theswitches 55 and 56 being suitably mounted on theirrespective support members 9. The limit switches 55 are operable to limit downward movement of thebase members 33, theswitches 56 being operable to limit upward movement of theirrespective base members 33.

With all of thebase members 33 disposed in their lowermost positions, shown by full lines in FIG. 2, the mattress structure is in its softest condition. Conversely, when all of thebase member 33 are raised to their upper limits of movement, theresilient slabs 34 are pressed against theshoe elements 32, and the load imparted to the mattress by a person reclining thereon is divided between themattress 11 and theresilient slabs 34. Thus, with thebase members 33 fully raised, the firmness of the mattress structure is at its maximum. As shown in FIG. 5, thebase members 33 may be disposed in any desired elevation between their fully raised and fully lowered positions independently of the others thereof, so that each of the separate areas or zones of the mattress structure overlying theseveral base members 33 will have different firmness characteristics. In the embodiment illustrated, showing a single or twinsized sleep unit, a person resting thereon may adjust the firmness of the unit under different portions of thebody, enabling the occupant to rest with maximum comfort.

It will be appreciated that the above-described structure may be used with equal facility with sleep units of double bed sizes or larger king-sized units. In such larger units, each occupant would normally rest on a different group of variable firmness mechanisms, each group being independently controlled by switch means convenient to each occupant individually.

The abovedescribed variable firmness sleep unit is particularly adapted for use in commercial accommodations such as hotels, motels, hospitals and other institutions wherein the sleep units are used by many different people over a period of time. The sleep unit of this invention lends itself equally to use in the home, wherein the sole user, in the case of a single or t-Win-size unit, may wish to vary the firmness of the unit, or specific areas thereof, from time to time, as health or other conditions may require.

In the interest of sanitation, thetop mattress structure 14 may be easily removed and replaced, by merely first removing thefabric cover 18, the moisture-proof sheet 16 affording substantial protection of themattress 11 from dust or moisture which may seep downwardly through the top foam layer 17 of the unit. If damage should occur to thecover 18 and top foam layer 17, replacement thereof may be quickly and easily accomplished.

What is claimed is:

1. A variable firmness sleep unit comprising:

(a) a frame structure including a generally horizontal supporting platform having a plurality of spaced openings therethrough;

(b) a relatively thick soft resilient mattress structure on said platform having a plurality of spaced passageways extending generally vertically therethrough and each axially aligned with a different one of said openings;

(c) a relatively thinner resilient pad on said mattress structure;

(d) vertically movable means underlying said platform;

(e) resilient means on said vertically movable means;

(f) a plurality of support rods each extending through a different one of said passageways and the platform opening aligned therewith and freely movable axially therein;

(g) a plurality of generally flat-topped flexible head elements each disposed between said mattress structure and said pad and each mounted on the upper end of a different one of said support rods for common axial movements therewith and for universal tilting movements relative thereto;

(h) shoe elements on the lower ends of said support rods between said platform and said resilient means;

(i) and lifting means for raising and lowering said vertically movable means to move said resilient means toward and away from supporting engagement with said shoe elements.

2. The sleep unit according to claim 1 in which said mattress structure comprises a block of elastic foam cushioning material.

3. The sleep unit according toclaim 2 in which said vertically movable means comprises a fiat rigid base plate, said resilient means comprising a second block of elastic foam cushioning material underlying said shoe elements.

4. The sleep unit according to claim 1 in which cooperating ones of each of said support rods and head elements are formed to define ball portions, the others thereof defining socket portions for reception of their adjacent ball portions, whereby said head elements are mounted on said support rods for said universal tilting movements of said head elements.

5. The sleep unit according toclaim 4 in which cooperating ones of each of said support rods and shoe elements are formed to define ball portions, the others thereof defining socket portions for reception of their adjacent ball portions, whereby said shoe elements are mounted for universal tilting movements on their respective support rods.

6. The sleep unit according to claim 1 in which said support rods each include a ball portion at each end thereof and a reduced diameter neck portion axially inwardly of each ball portion, said head and shoe elements each defining a generally centrally disposed socket portion for reception of an adjacent one of said ball portions.

7. The sleep unit according to claim 1 in which said support rods are disposed within a given area of said mattress structure, said area being inwardly spaced from the marginal edges of said mattress structure and comprising a plurality of zones, each of said zones having a different range of firmness variation than an adjacent zone.

8. The sleep unit according toclaim 7 in which said vertically movable means comprises a plurality of laterally spaced fiat base plates, said resilient means including a plurality of blocks of elastic foam cushioning material each on a different one of said base plates, said lifting means being arranged to raise and lower each of said base plates independently of the others thereof.

9. The sleep unit according to claim 1 in which said pad includes a pair of upper and lower layers of elastic foam cushioning material and an intermediate layer of flexible moisture-proof sheet material.

References Cited UNITED STATES PATENTS 2,096,435 10/1937 Marquardt 5248 2,327,829 8/1943 Sternberg et al 5248X 2,558,288 6/1951 Backus 5-248 2,595,072 4/1952 GOttSchalk 5248 2,842,784 7/1958 Grund 5351 2,874,390 2/1959 Stone 5351 2,985,895 5/1961 Bloom 5-248 2,992,443 7/ 1961 Winikoff 5-351 3,059,249 10/1962 Kamp 5246 3,153,249 10/1964 Janapol 5-239 3,252,170 5/1966 Frye 5248 CASMIR A. NUNBERG, Primary Examiner U.S. C1.X.R. 5248, 351

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