Mattress spring bellows assembly as for hospitals, and the like

[57] ABSTRACT

The invention discloses a mattress, as for a hospital bed, an assembly of inflatable bellows spring segments being interposed between the under side of the mattress and a support box therefor which may be said to correspond to the conventional bed spring supporting slats under the springs of conventional mattresses. Ail of the adjustments offered by conventional hospital bed frames, and more, may be made for the mattress of this invention by virtue of the shapes into which the combinations of spring bellows segments may be inflated. The invention, in effect, employs a careful selection of bellows spring segment shapes, not only to provide a wide range of positional adjustments of the mattress, but these segments may serve, cooperatively, to provide the springs of the mattress, also with the degree of spring or cushioning effect being infinitely adjustable by virtue of the selective inflation of bellows segments, and the selectivity provided as to degree of inflation of the respective bellows.

Claims, 12 Drawing Figures

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PATENTEDJUH 6 1972

3,667,075

SHEET 1 OF 2

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ATTORNEY

VENT

PATENTEDJUN 61972

3,667,075

SHEET 2 OF 2

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3,667,075

MATTRESS SPRING BELLOWS ASSEMBLY AS FOR HOSPITALS, AND THE LIKE

The invention relates to a mattress spring bellows assembly, as for hospitals, taking the place of conventional springs, and including a support box to take the place of the conventional bed slats; control of selective inflation and deflation of respective bellows spring segments determining mattress positions of adjustment, and also its degree of cushioning or spring effect.

As a primary object the invention sets out to provide a mattress spring bellows assembly employable both as the means to selectively control mattress positions of adjustment, also degree of cushioning and spring effect.

It is also an important object of this invention to provide a mattress spring bellows assembly of this class including an assembly of spring bellows segments replacing conventional bed spring units, and a bellows segment support box replacing conventional bed slats.

It is yet another important object of this invention to provide a mattress spring bellows assembly of this class in which adjustments obtained by selective inflation and deflation of spring bellows segments may range through a widest selection of mattress positions.

It is another primary object of the invention to provide a method of selectively adjusting mattress position, as for hospital beds, by using selectively resilient cushion means to effect selective positions of the mattress, while at the same time using the adjustment means to provide cushion or spring effect.

It is also another important object of the invention to provide mattress bellows spring segment assembly and method of use, whereby to selectively control degree of mattress spring support or cushioning, over a wide range of degree of cushioning effect, and over a wide range in patient elevations.

Other and further objects will be apparent when the specification herein is considered in connection with the drawings, in which:

FIG. 1 is an isometric view of the head, top, and right side of an embodiment of mattress comprised by the invention; the view also showing diagrammatically the control system for spring bellows operations; 40

FIG. 2 is a side elevational view, partially diagrammatic, showing the mattress with a first bellows selectively inflated to raise the head of the mattress to support a patient in head partially elevated position;

FIG. 3 is a side elevational view, partially diagrammatic, 45 showing the mattress with a first and second bellows selectively inflated to raise the head of the mattress to support a patient in head substantially raised position;

FIG. 4 is a side elevational view, partially diagrammatic, showing the mattress disposed to support the head of a pa- 50 tient, as set forth in description of FIG. 2, and with a third bellows selectively inflated to raise the mattress to dispose an apex under the knees of the patient, as lower body is thus lifted;

FIG. 5 is a side elevational view, with a fourth bellows selec- 55 tively inflated partially diagrammatic, showing the mattress whereby to support the patient in a straight tilt position, head upwardly, feet downwardly;

FIG. 6 is a side elevational view, partially diagrammatic, showing the mattress with a fifth bellows selectively inflated, 60 whereby to support the patient in a straight tilt position, head downwardly, feet upwardly;

FIG. 7 is a side elevational view, partially diagrammatic, showing the mattress with the aforesaid five bellows each slightly inflated, whereby to support a patient on the flatly 65 disposed mattress, as upon spring cushions;

FIG. 8A is a sectional view, partially diagrammatic, typical of the operation of the solenoid actuated valves SOL 1-5, FIG. 1, showing supply and vent conduits blocked, whereby the respective spring bellows controlled thereby retains degree of 70 inflation or deflation at which blockage has occurred;

FIG. 8B is a sectional view, partially diagrammatic, typical of the operation of the solenoid actuated valves SOL 1-5, FIG. 1, showing compressed air supply open to one of the mattress spring bellows; 75

FIG. 8C is a sectional view, partially diagrammatic, typical of the operation of the solenoid actuated valves SOL 1-5, FIG.

1, showing air vented from a deflating spring bellows;

FIG; 9 in an enlarged, fragmentary, sectional elevational 5 view of bellows construction in which respective bellows are separated by common sheet therebetween; and

FIG. 10 is an enlarged, fragmentary, sectional elevational view of bellows construction in which each bellows is a separate member, the bellows being disposed one upon the 10 other.

Referring now in detail to the drawings in which like elements are assigned like reference numerals in the various views, a mattress 10 is shown in FIG. 1 with a support box 11 thereunder, of wood, metal or plastic, as desired. In this view ¹⁵ the head portion 10α of the mattress 10 is shown as having been partially raised, the mattress being transversely bent at lOfe, while the lower portion 10c of the mattress 10 extends in flat position. In this view no conventional bed springs are indicated under the support box 11, but rather this support box may be comparable with the conventional frame of a hospital bed, usually mechanically adjustable. As is well known, such conventional frame is supported by; or comprises part of the bedstead. A conventional bedstead 13 is shown in dotted lines 25 *n FIG-1 supporting the aforesaid mattress support box 11.

In FIG. 1 an upper head bellows segment or first portion 12a of a bellows spring assembly or unit 12, is indicated as having been inflated, compressed air having been admitted therein into through a flexible conduit 14α. Also, in this view flexible 30 ^condu*‘^s 14b, 14c, 14d, and 14e are indicated as extending through a central head slotT la in the support box 11, the flexible conduits extending from second, third, fourth and fifth bellows spring segments to be hereinbelow described.

FIG. 2 shows the mattress 10 in substantially the same posi35 tion in side elevation as the mattress is shown disposed in the isometric view of FIG. 1. That is, the upper portion 10α of the mattress 10 has been elevated by admitting compressed air into the first or upper head bellows segment 12α through the flexible conduit 14α.

In this position the mattress 10 is indicated as having bended transversely along bend line 10b substantially where a conventional mattress would bend as manipulated by the adjustment mechanism of a conventional hospital bed frame. As aforesaid, the lower portion 10c of the mattress extends flatly or prone. In this view a second bellows spring or lower head bellows segment 12b is indicated in deflated position under the upper head bellows segment 12a, a third bellows spring or uppermost foot bellows segment 12c is indicated in deflated position under the lower mattress portion 10c, a fourth bellows spring or upper full mattress length segment 12d and a fifth bellows spring or lower full mattress length segment 12e, are both indicated in deflated position. The lower edges (away from head) of the bellows segments 12α and 12b, and the upper edge (away from foot) of the bellows segment 12c may be considered adjoined together along a transverse junction line 15 on the under side of the mattress 10 opposite the aforesaid bend line 10b. In this view the flexible conduit 14α is alone indicated for purposes of clarity, as extending through the slot 11α, centrally through the head of the support box 11. In the successive views, FIGS. 3-7, inclusive, these aforesaid bellows segments (five) will be designated by the same reference numerals.

Referring now to FIG. 3, additional compressed air has been admitted through the flexible conduit 14b into the bellows spring or under head segment 12b, the bellows spring or upper head segment 12α remaining inflated as aforesaid. Thus the head portion 10α ofthe mattress 10 has been brought into substantially uppermost raised position corresponding with the uppermost head raised position of a conventional hospital bed mattress as adjusted by a conventional mechanical adjustment for a conventional hospital bed frame.

As shown in FIG. 4, the second bellows or lower head bellows segment 12b is shown deflated, the upper head bellows segment 12α being shown deflated. In this view the uppermost foot bellows segment or third bellows spring segment 12c is

3,667,075 shown as having been inflated to provide an apex 16 as shown, so that the lower portion of the mattress 10c is raised to dispose a transverse bend line 104 uppermost under the knees of the patient so that the knees are raised to an upwardly raised position. In this view the flexible conduit 14c is shown as passing rearwardly under the support box 11 and then upwardly into the support box, and outwardly through the central head slot 11α. The flexible conduit 14α from the inflated upper head bellows segment 12α is shown as in FIG. 2, the flexible conduits from the remaining or deflated bellows segments being omitted for purposes of clarity.

Now considering FIG. 5, the hereinabove described bellows segments 12α, 12b and 12c are shown deflated, with the upper full mattress length or fourth bellows segment 124 inflated, the lower full mattress length segment 12e being deflated. Noticeably, the bellows segment 124 is of five sided cross-section when inflated; with a short upstanding side at foot, and a substantially larger opposite dimension at head, thus to raise the mattress, (all other bellows segments deflated), so that it is disposed in straight position, tilted from head to foot, with head uppermost, foot lowermost. In this view the flexible conduit 144 is shown extending from the inflated fourth bellows segment 124, other conduits being omitted for purposes of clarity.

As shown in FIG. 6, bellows segments 12α, 12b, 12c and 124 are shown deflated, with the lower full mattress length or fifth bellows segment 12e inflated. The bellows segment 12e is shown of five sided cross-section in elevation, correspondingly as in the case of the upper full mattress length or fourth bellows segment 124, hereinabove described. A short side upstands at the head, and a substantially larger opposite dimension at foot, thus results in raising the mattress so that it is disposed in straight position, tilted from foot to head, with foot uppermost, head lowermost. In this view the flexible conduit 14e is shown extending from the inflated fifth bellows segment 12e through the aforesaid central support box head slot 11α, other conduits being omitted for purposes of clarity.

Referring now to FIG. 7, the mattress 10 is shown in a lowered, prone position, with each of the bellows segments 12α, 12b, 12c, 124 and 12e being shown substantially deflated, with only enough compressed air in each bellows segment for them collectively or cumulatively to support the mattress 10 thereabove with a spring cushion action or effect. The respective flexible conduits 14α, 14b, 14c, 144 and 14c for the respective bellows segments 12α, 12b, 12c, 124 and 12e, are shown, as extending from the slot Ila through the head of the support box 11, such conduits being shown broken off and not joined to their respective bellows segments, this for purposes of clarity.

Referring back to FIG. 1, the respective conduits 14α, 14b, 14c, 144 and 14e are shown extending to a control box 17, there to be connected onto respective projecting compressed air delivery nipples 18α, 18b, 18c, 184, 18e. These nipples receive supply compressed air to be selectively passed outwardly therethrough, by selective operation of solenoid valves SOL 1-5, inclusive, to pass through the respective conduits 14α, 14b, 14c, 144, 14e, into the respective bellows segments 12α, 12b, 12c, 124,12e, as hereinabove described.

Respective three position switches 19α, 19b, 19c, 194, 19e are provided to be selectively manually turned upwardly, as indicated in FIG. 1, to close circuit, selectively, via respective contact points 20α, 20b, 20c, 204, and 20e, to operate the respective solenoid valves SOL 1, SOL 2, SOL 3, SOL 4, SOL 5, in direction to actuate respective spool valves, as the spool valve 21, FIG. 8A, to be hereinbelow described.

Oppositely, if the three position switches 19α, 19b, 19c, 194 and 19e, are turned downwardly, as indicated in FIG. 1, to close circuit via respective contact points 25α, 25b, 25c, 254 and 25e, to operate the respective solenoid valves SOL 1, SOL 2, SOL 3, SOL 4 and SOL5, in direction to oppositely actuate respective spool valves, as the aforesaid spool valve 21, FIG. 8A, to be hereinbelow described, as aforesaid.

Normally the switches 19a-e are spring biased, as by opposed springs 22α, 22b on opposite sides of switch buttons or levers 23a-e to place the respective spool valve 21 for each bellows segment control in a neutral or blocking position. For each spool valve, as the spool 21, FIG. 8A, its plungers 24α, 24b are thus disposed to block respective SUPPLY and VENT, FIG. 8A. For illustrative purposes in this view, the switch button or lever 23α, connected to positive side of an electrical power line, is shown spring biased by springs 22α, 22b to neutral position.

Also in FIG. 8A, the stem of the valve 21 is indicated as including the wiring of the solenoid SOL 1.

As shown in FIGS. 8A, 8B and 8C, the respective plungers 24α, 24b on the stem of the valve 21 are biased respectively downwardly by respective compression spring 26α, and upwardly by respective compression spring 26b, as such, disposed about the valve stem 27, are based respectively upwardly and downwardly within the housing 28 of the respective solenoid involved. It thus follows that the lower portion 29 of the valve stem 27 comprises the armature of the solenoid SOL 1, as aforesaid. The double action of the solenoid then results from circuit closure via armature winding 30α, common ground 31, switch lever or button 23α upwardly against contact 20α, or oppositely, circuit closure via armature winding 30b, common ground 31, switch lever or button 23α downwardly against contact 25α.

Thus, in FIG. 8B, with the contact closure 23α, 20α, (FIG. 1 and FIG. 8A) effective, the upper spring 26α is shown substantially compressed by the upper plunger 24α, the lower spring 26b extended behind the lower plunger 24b This has placed the SUPPLY passage open for compressed air passage therethrough into center bore 32, then to pass via BELLOWS passage to a respective BELLOWS to be inflated. In the case submitted as example, the compressed air would pass from the BELLOWS passage, FIG. 8B, via the nipple 18α and conduit 14α, FIG. 1, to inflate the upper head bellows or first bellows spring segment 12α.

Then, in FIG. 8C, with the contact closure 23α, 25α, (FIG. 1 and FIG. 8A) effective, the lower spring 26b is shown compressed by the lower plunger 24b, the upper spring 26a having expanded behind the upper plunger 24α. This has placed the VENT passage open to vent the air from the aforesaid, now deflating first bellows spring segment 12α, by way of the BELLOWS passage and plunger bore 32. The vent from the respective solenoids may be directly from each solenoid housing 28 to a vent manifold 33, indicated at the bottom of the control box or panel 17 in FIG. 1. Note also that from the AIR SUPPLY, a supply header 37 is indicated in FIG. 1 for carrying the compressed air to the respective solenoid SUPPLY passages, as though shown in FIGS; 8A, 8B and 8C.

The invention has great adaptability in usage in that the respective five bellows or bellows spring segments may be inflated altogether or selectively in parts or degrees of inflation. In cases, conventional mattress springs may be provided under the support box 11, but as a matter of fact the invention can be said to eliminate conventional bed springs under mattresses as one of its objects. Description of this feature has been set forth in description of FIG. 7. Also wide variances of positioning of mattress 10 can be obviated. For instance a condition may be considered where it may be desirable to raise a mattress with patient level thereon, to a substantial elevation above support box 11 and the bedstead on which it is installed. This can be done by inflating both bellows spring segments 124 and 12e in some considerable part, whereby they cumulatively provide the upper surface of the upper full bed length bellows segment 124 to extend flatly, with mattress 10 thereon, patient on mattress.

Noticeably, the segments may be adjoined, with common sheet of material, as of plastic, separating adjacent bellows. Note the exemplary common sheet 34 between bellows seg- / ments 12α and 126, FIG. 9. In this form of bellows construction the upper hem 34α of the lower bellows segment 126 may be connected to an under, forward strip of the common bel70

3,667,075 lows sheet 34, separating segments 12α and 12ft, as by applying flowable epoxly resin thereto to harden. On the other hand note the construction shown in FIG. 10, where examples of bellows segments 12d, 12e are shown, one disposed upon the other, the lower sheet 34α of the upper full extent bellows segment 12d resting upon the upper sheet 34b on the lower full extent bellows segment 12e.

The invention need not necessarily rely upon such a plurality of bellows spring segments, but a practical and operable combination may be provided simply by bellows spring segment combinations 12α and 12c, the bellows spring segments 12b, 12d and 12e being omitted. Or obviously combinations 12α, 12c, 12b may serve, or combinations of 12α, 12c, 12c? or 12α, 12c, 12Φ can also fit various exactments. Such combinations of lesser segments obviously eliminate respective conduits and solenoid actuated valves therefor with a less expensive control system being necessitated. Obviously, the invention is not limited to specific shapes and number of bellows spring segments, nor to specific control systems therefor. Thus the drawings, and their description in the specification are by way of example, and not a limitation on the broad spirit of the invention. The appended claims complete the disclosure.