US2067136A - Wall bed - Google Patents

Description

Jan. 5, 1937;

E. H. BRIDENBAUGH 7,1 6

WALL BED Filed Feb. 2, 1953 4 Sheets-Sheet 2 /Z6//3 E 2/ 2/ FTC-LL 7 ATTORN Jan. 5, 1937. E. H. BRIDENBAUGH 2,067,136

v WALL BED Filed Feb. 2, 1933 4 Sheets-Sheet 3 Jan. 5, 1937. E. H. BRIDENBAUGH 2,067,136

WALL BED Filed Feb. 2, 1933 4 Sheets-Sheet 4 I ATTO Y.

Patented Jan. 5, 1937 SA'E'E 'l' QFFICE WALL BED Elmer H. Bridenbaugh,

Denver, 0010., assignor,

Application February 2, 1933, Serial No. 654,852

14 Claims.

My invention relates to improvements in wall beds, the operation of which is fully automatic save for the closing of an electric circuit, and consists primarily of a hydraulic power unit actuated by a fluid, under pressure, in association with other suitable mechanical construction.

Briefly, my invention embodies a bed pivotally mounted at one end by means having a conjunctive operative relation to a primary pivotal shaft, on one end of which is disposed in fixed relation thereto, an oscillating quadrant type piston enclosed in a suitable pressure chamber, the piston being actuated by a fluid, preferably oil, under pressure, through the medium of an electrically operated hydraulic pump.

The primary object of my invention is to provide a wall bed with means for its operation from and to a closed position, by the simple act of closing an electric circuit, thereby obviating strenuous physical exertion and danger of accident or injury to the operator.

Another object of primary importance of my invention is to provide a wall bed with such mechanical construction and safety devices that can be so minutely adjusted relative to the weight of the bed, that any additional weight will automatically cause the bed to become, or remain stationary.

Another object of my invention is to provide a wall bed with uniform, quiet and positive application of power, and means for regulating the degree of application of said power, to the extent of operating the bed assembly only, which assembly inciudes a fully made up bed ready for occupancy.

Another object of my invention is to provide suitable construction throughout so that space occupied by the same is well within the conserved and conventional space for the wall type of bed.

Another object of my invention is to provide means for positively removing application of power at the termination of either the up or the down stroke, except at the will'of the operator.

Another object of my invention is to provide means whereby if any obstruction comes in the path of the beds course of travel, either up or down, it will remain stationary until such obstruction is removed, in which event the bed will continue to the full limit of its movement without endangering any of its mechanism.

Another object of my invention is to provide suitable mechanism working in conjunction with the power unit whereby the bed may be manually operated, in case for any reason it is desired to do so.

Another object of my invention is to provide a suitable fluid reservoir for the hydraulic unit, and means associated therewith for constantly keeping the pressure chamber fully charged with said fluid.

Another object of my invention is to provide an efficient and positive leverage mechanism operable in such a manner as to cause the bed and said leverage mechanism to occupy a minimum space in the closed position.

In the following detailed description of my invention, reference is made to the accompanying drawings, which form a part hereof, and in which like reference characters refer to like parts in all views throughout the description.

In the drawings:

Fig. l is a side elevation view of the bed in broken away section, showing the same in its open position; Fig. 2 is a side elevation view of the bed, with parts broken away, showing the same in opened position; Fig. 3 is a side elevation view of the bed in broken away section, showing the same in closed position; Fig. 4 is an end view in cross section of the bed, taken on the line 4-4 of Fig. 1; Fig. 5 is a vertical cross section view of the hydraulic pressure chamber; Fig. 6 is a vertical cross sectional view taken on the line 66 of Fig. 5; Fig. 7 is a sectional view taken on the line l'i of Fig. 6; Fig. 8 is a vertical cross sectional View of the hydraulic pump and the mechanism for controlling the pressure of the fluid within the hydraulic pressure chamber; Fig. 9 is a cross sectional view of the hydraulic pump taken on the line 9-9 of Fig. 8; Fig. 10 is a cross section view taken on the line iii-4U of Fig. 8; Fig. 11 is a cross-section view taken on the line H-ll of Fig. 8; Fig. 12 is a cross section view taken on the line l2-|2 of Fig. 8; Fig. 13 is a fragmentary view of the pivotal base of the bed taken on the line I3I3 of Fig. i, and showing the arrangement of the counterbalancing springs, and Fig. 14 is a fragmentary cross section view of the pivotal base of the bed taken on the line l4l4 of Fig. 4.

Let the numeral I6 represent the bed assembly consisting of head, foot and side rail members, which is of ordinary construction for a wall type bed except in its adaptation to my invention, which will be apparent in the following specification. This bed is provided with a foot piece consisting of two members I! and Ila, pivoted together as shown at I8, permitting the member I! to swing on its pivot to a position parallel with the frame of the bed when the latter is in the closed position. The member I? of the foot piece is connected by means of a telescoping rod IS with the base 24 of the bed, as shown at 22, the member 23 of which is pivotally connected with the member l'i, as shown at 26, and the member 20 of which is pivotally connected with the base iii of the bed, as shown at 22. This telescoping rod enables the latter to be shortened or lengthened, as the case may be, when the bed is closed or opened.

The bed It is also provided with a head piece of similar construction and operation as that of the foot piece just described, and consists of members 2! and 28 pivotally joined at 29, as illustrated in Figs. 1 and 3. A telescoping rod, consisting of male and female members 3i and 32, connects the member 2? of the head piece with the wall, whereby said member is held in vertical position when the bed is in its opened position. This telescoping rod is pivotally connected with the member 2?, as shown at 3 3, and at its other end with the wall, as shown at Ma, thus enabling said rod to swing to the position shown in Fig. 3 when the bed is closed.

A housing designated in its entirety by the numeral 35 and forming a hydraulic pressure chamber, is rigidly secured to the base ill of the bed, and in which chamber there is operable a piston designated in its entirety by the numeral 35. This piston is secured in fixed relation to a shaft 37 by means of a spline 38. This shaft 37 extends the entire width of the base 2i of the bed so that when the piston as is operated the bed will be moved by the rotation of the shaft 3'5 to the open or closed position, depending upon the direction in which the piston 35 is actuated.

There are located in the housing of the pressure chamber 35, passage-ways 39 and do, through which the fluid, preferably oil, will circulate in the manner hereinafter described, for actuating the piston 36. When the bed is moved to its opened position the fluid will be forced under pressure through the passageway 33, behind the piston 36, causing the latter to move to the dotted line position, as shown in Fig. 5, and actuate the bed to the opened position. Now, when it is desired to close the bed, the fluid is caused to flow under pressure through the passageway so behind the piston 36, and causes the latter to move upward, rotating the shaft 3i, and carrying the entire bed with such movement to its closed position.

Sector shaped blocks 4| and 42 are arranged within the pressure chamber 35 on opposite sides of the stem 33 of the piston 36, for sealing the pressure chamber 35 against leakage around the axis of the piston, The piston proper is provided with suitable packing M on its outer end and opposite edges, which tightly engages the walls of the chamber 35 under pressure through the medium of springs 45, thereby preventing leakage of the fluid around the edges of the piston.

A pump housing 45 is secured on top of the pressure chamber housing 35, as more clearly shown in Figs. 8 and 9, and is provided with passages il and is, which respectively register and communicate with the passages 39 and ii? of the pressure chamber housing. A pump is arranged within this housing as shown in Figs. 8, 9 and 12, and is provided with gear type pistons 9 and 50, which mesh with each other, as more clearly shown in Fig. 8. The gear 9 is the driving gear and is fixedly secured upon a driving shaft 50*,

the latter being directly connected with and operable by the armature of an electric motor 5|. The driven gear 50 of the pump is fixedly secured upon a shaft 52 journaled in the pump housing 58. This pump housing is in separable parts which are tightly secured together and sealed against leakage of the fluid by means of bolts 53. Further description of this housing appears to be of no advantage in this specification, except such as may be necessary in relation to the invention as a whole, which will be given in its proper connection.

The pressure chamber in the housing 35, together with the passageways G7 and 58, as well as the chamber in which the pump gears 59 and 50 are arranged are all constantly filled to capacity with oil, which may be replenished whenever necessary from a reserve tank 5 3 through the opening of a valve 55, whereby the oil will be replenished by gravity flow.

The passageways 41 and 48 are separated from each other through the medium of a partition 56, compelling the circulation of the oil through the chamber, designated by the numeral 5?, in which the pump gears 49 and 5B are arranged. One wall of this chamber 51 is provided with a port 58, located below the journals of the gears 49 and 59, and communicating with the passageway 7, and the opposite wall of said chamber is provided with another port 59 located above the journals of said gears, and communicates with the passageway d8. Through these ports 58 and 59, the oil is forced alternately through the passageways d! and 48, depending upon the direction of rotation of the gears t9 and 50. To illustrate, when said gears are rotating in the direction of the arrows in Fig. 8, the oil is being forced through the port 58 and passageways ll and 39, behind the piston 36, thereby actuating the latter to move the bed through the medium of the shaft 37 to its opened position, after which the piston will occupy the dotted line position, shown in Fig. 5. Now, assuming that the bed is in the opened position, and it is desired to actuate the same to the closed position, the electric motor 5! is rotated in such a direction as to cause the gears 59 and 59 to rotate in the direction opposite that shown by the arrows in Fig. 8, thereby forcing the oil through the port 59 into the passageways it and 49 to the rear of the piston 36, and the pressure thereby created actuates the said piston to the full line position, as shown in Fig. 5, causing the shaft 31 to rotate therewith and move the bed to the closed position.

On one side of the housing of the pressure chamber 35 there is located a housing 60, in which is located an electric switch 61 into which electrical conductors within the cables 62 and 63 lead. This switch 6! is of the ordinary circuit make and break type, and need not be described or shown in further detail.

Through the medium of a switch lever 64, the mechanism of the switch 6! is operably connected with a slide bar 65, as shown at 66. The opposite ends of this slide bar 65 are pivotally connected, as shown at 67 and 68, respectively, to links 59 and 10, each of which forms the arm of a bell crank lever, fixedly secured upon shafts TI and i2, journaled in the housing of the pressure chamber 35, through the medium of journal boxes l3 and i l, set in the housing of the pressure chamber 35, one of which is shown in detail in Fig. 6. The other arms i5 and 16 of these bell crank levers are respectively secured to the -75 shafts H and 12 .and occupy positions within the pressure chamber 35, so that they will be engaged by the piston 36, whereby the bell crank levers will be actuated to move the slide bar 65. The movement of this slide bar 65 actuates the switch 6| to stop the rotation of the motor and to set the switch for the rotation of the motor in the opposite direction when the electric current is applied through the medium of a switch Tl, operable to cause the motor 5! to rotate in either direction. In other words, if the bed is in its closed position, this slide bar 65 has been actuated to shut off the current to the motor and to set the switch so that the motor will rotate in the direction to move the bed to the open position when current is applied by actuation of switch ii, and vice versa.

By the use of a specially constructed and applied relief valve, the pressure of the fluid, under operation of the pump, may be equalized against both sides of the piston 36, causing the latter to remain stationary, and the bed likewise to remain stationary at any position in the path described by the opening or closing movement of the latter. This relief valve consists of a hollow nipple I8 threaded at its lower end into a female casting 19 mounted on top of the pump housing 46, and which casting is provided with passageways 89 and 8! communicating with the gear chamber 57 at their lower extremities and with the interior of a valve housing 82, which said housing is received by the nipple l8, and engaged by the lower end of the latter with a flange 83 formed on the bottom of the valve housing 82. This flange 83 rests upon a disc valve seat 84, and by the threaded connection 85 of the nipple 8 with the female casting :9, the disc valve seat 8d is held against displacement, and also a tight joint is effected thereby to prevent the leakage of the fluid therethrough. To the top of the nipple 18 there is threaded a cap 85 having integrally formed thereon a hollow stud 91, which is provided with exterior threads 88. There is threaded upon this stud 8'! an adjustable thumb nut 89, which is held in its adjusted position by means of a lock nut 99, also threaded upon the stud 8! below the thumb nut 89. A tension screw 91 passes through the top of the thumb nut 89 and is keyed in fixed relation to the latter by means of a spline 92 so that both the thumb nut 89 and the tension screw 91 turn together. This tension screw also passes through the hollow of the stud 8'! and cap 86 into the nipple l9, and is threaded at its lower end, as shown at 93, into a cross-head 94, which is vertically movable within the nipple 18 by means of the operation of the tension screw 9!. The top of this cross-head 94 is provided with a flange 95, which has a slot therein that receives a spline 99, and by means of which the cross-head 94 is prevented from rotating under adjustment of the tension screw 9|, although permitted to move in a vertical direction. The tension screw 9| is provided with a circumferential flange b, which engages with a suitable packing 0, held in place between the cap 86 and the top of the nipple 78, whereby leakage of the fluid through the cap or around the tension screw is prevented.

The cross-head 94, below the flange 95 thereof, is of sufficient less diameter than the housing formed by the nipple 18, whereby space is permitted to receive the upper end of a spiral tension spring 91. The upper end of this spiral tension spring 91 is engaged with the flange 95 of the cross-head 94, while the lower end of said spring is engaged with a disc 98, which has an opening 99 in the center thereof to receive the lower end of the tension screw 95, and thereby permit the movement of the disc 98 in a vertical direction against the tension of the spring 97, for the pur- ,pose hereinafter described.

At the lower part of the hollow casting 79, the passageways ll and d8 communicate with elongated chambers 99 and mi), respectively, which said chambers are formed by the partition 56. The valve seat 85 is arranged immediately above these elongated chambers 99 and Hill, and communication established with the interior of the valve housing 82 through the ports 30 and 8!, which respectively are arranged above the chambers 99 and H39. There are also provided in this valve seat 8%, ports lfii and i112, respectively positioned above the chambers 99 and H38. These ports ml and 92 are normally closed by ball valves Hi3 and H24, which are held seated by means of stems I95 and 59S, loosely engaging the said ball valves Hi3 and EM. These valve stems pass through perforations in the top of the housing 82 and engage with the bottom of the disc 93. the spring 9? against the disc 98, the valve stems H35 and it are pressed downwardly against the ball valves )3 and H34, holding the latter firmly seated and closed against any minimum predetermined pressure of the fluid created by the pump. Pins IE3? and H38 are set vertically within the valve housing 82 and operate as guides to prevent displacement of the ball valves E33 and 94.

The predetermined pressure by which these valves E93 and I94 are opened may be determined by adjustment of the tension screw 9|, and con sequent upward or downward movement of the cross-head 94. Now then, we will assume that the bed is in the opened position, and that a person or other abnormal weight is thereon, and we will also assume that the electric motor 5i and the pump gears 49 and 59 are in operation for creating pressure of the fluid behind the piston 36, the latter occupying the position as shown by dotted lines in Fig. 5. The operation of the piston 36 under the influence of the pressure of the fluid thus created, will be negatived under the influence of the person or other abnormal weight upon the bed, and will overcome the tension of the spring 91, forcing in this case the valve I94 open and permitting the fluid to pass through the port l iii into the chamber 579 and thence through passageways 4i and 3% to the opposite side of the piston 36, thereby equalizing such pressure and permitting the operation of the pump without actuating the piston 38, the fluid being by-passed. Now, assume that there is some obstruction to prevent the opening of the bed, such as coming in contact with a chair or some other article of furniture. The relief valve mechanism would again come into operation to permit the continued rotation of the electric motor, as well as the pump gears 49 and 50, and to permit the piston 36 to remain stationary. In such case the valve E95 would open against the tension of the spring 9'1, and the fluid be permitted to escape ,through the port 86 and the port 1:12 into the chamber I08 and thence through passageways 48 and 69 to the rear of the piston 36, thereby equalizing the pressure on both sides of this pis ton and causing the latter to remain stationary.

The gear and leverage mechanism and operation thereof is in exact duplicate on both sides of the bed, and therefore the same reference characters will be used to designate the duplicate parts Under the influence of the tension of iii) thereof, and will be referred to in the singular, particular reference being made to Figs. 2 and 3.

A driven gear its is secured to the frame of the bed by means of bolts, or rivets i it, and this gear I89 meshes with another driving gear iii. The driving gear Hi is fulcrumed upon a bar Hi2, pivoted at its lower extremity to the base of the bed 2 l as shown at i3, and the upper end of said bar H2 is pivotally connected with the driving gear ill, as shown at lid. The driven gear N39 is fulcrumed in a similar manner upon a bar I I5, the lower end of which is pivotally connected with the base M of the bed, as shown at H6, and the upper extremity thereof pivotally connected with the driven gear Hi9, as shown at I ll. These two fulcrum bars H2 and M5 are connected together by means of a cross bar l i ii, pivotally connected with the two fulcrum bars, as shown at H9 and i253. This connecting bar li-Si operates to hold the two gears Mil and iii in meshing relation, and also to add stability to the fulcrum arrangement.

By reason of the foregoing described fulcrum arrangement, in its relation to the power transmitting shaft 3'5, the bed is moved at right angles to its axis simultaneously with the movement of the bed to its opened and closed positions, and as a consequence thereof the weight being carried is lessened as the bed is being moved to the closed position, and of course the strain incident to the carrying of a heavy load is being diminished during the entire movement of the bed to the closed position. Also, by reason of such fulcrum arrangement, as the bed is moved to its closed position the leverage mechanism is moved rearwardly into the wall compartment, and the bed proper drawn downwardly in a vertical direction, and moved rearwardly, or laterally of the axis of the bed, to a position well within the wall compartment, thereby conserving space to the minimum degree, and obviating the necessity of relatively larger compartment space to provide room for the operation of the fulcrum mechanism.

An eccentric arm 52! is secured in fixed relation to the shaft 3i as shown at !22, and the opposite end thereof is pivotally connected with the lower extremity of a link are, and the upper extremity of the link 92 3 is pivotally connected with the gear HI, as shown at i25. The rotation of the shaft 37 actuates the eccentric arm HI, and through the medium of the link i2 5 causes the gears Hi] and H! to rotate in meshing relation for opening or closing the bed, as the case may be.

The gear iii is provided with an integrally formed arm 425 to the outer extremity of which a bar E26 is pivotally connected, as shown at 52?, and the other end thereof pivoted as shown at I28, to an eccentric arm E23, which is secured in fixed relation with a right angular shaped counter balancing bar 535, journaled at its opposite ends in the base 25 of the bed as shown at lid and extending parallel with the axis of the bed, or the shaft 3?.

Horizontally disposed spiral springs Hi8 are arranged transversely of the base of the bed, and connect the counterbalancing bar its with a parallel arranged stationary bar E32. These spiral springs MG, exerting their influence through the medium of the counterbalancing bar E35, eccen tric arm I29, bar H26 and the gear l l Loperate to counterbalance the bed and to cause an even, uniform movement of the latter to the opened and closed positions, and to reduce vibration in the operation of the various parts of the bed. When the bed is being actuated to its opened position,

the tension upon these springs I4!) is being increased, and the said springs are being relieved of tension as the bed is moved to its closed position.

An arch shaped guide and brace member I 33 is secured to the base 2! of the bed, and the fulcrum bars I i2 and 525 are arranged upon opposite sides thereof. This arch shaped guide and brace member its is provided with spaced apart stop pins HM adapted to be engaged by the fulcrum bar I I2, whereby movement of the latter in either direction is limited.

The fulcrum bar H5 is provided with an integrally formed arm I36 extending at right angles to the pivot l is of said bar, and adapted to operatively engage with a stud E3! on the eccentric arm i2 5, intermediate the extremities of the latter. The outer extremity of the arm I36 is provided with a curve 538, concentric with the shaft 31, which is in constant engagement with the stud 53?, and this curved edge terminates in a half circular recess E39, into which the stud I3! is received when the bed has reached the limit of its closing movement. Through the operation and shape of this arm i36, in its relation to the eccentric arm 52!, engagement of the stud I37 with the recess use when the bed has reached the limit of its vertical movement towards the closing position acts to impart to the latter a sudden thrust to a completely closed position and there firmly hold the assembly.

While there has been described and illustrated herein a specific form and application of the invention, it is understood that the same is not limited thereto and that modifications and variations thereof may be made without departing from the spirit of the invention or the scope of the appended claims.

Having thus described the invention, what I claim and desire to secure by United States Letters Patent is:

1. In a wall bed, the combination of means for actuating the bed, comprising a driving shaft, 2. driving gear operatively connected with said driving shaft, a driven gear mounted on the frame of said bed and meshing with said driving gear, fulcrum bars upon which said driving and driven gears are pivoted, and power transmission means connected with said driving shaft.

2. In a wall bed, the combination of means for actuating said bed to its opened and closed positions, comprising a driving shaft, a driving gear operatively connected with said driving shaft, 2. fulcrum bar pivoted at one end, said driving gear being journaled to the opposite end of said fulcrum bar, a driven gear fixedly secured to the frame of the bed and meshing with said driving gear, a second fulcrum bar pivoted at one end, said driven gear being journaled to the opposite end of said last named fulcrum bar, and means connecting the first named fulcrum bar with the last named fulcrum bar for holding said driving gear and said driven gear in meshing relation.

3. In a wall bed, the combination of means for actuating said bed to its opened and closed positions, comprising a driving shaft, 2. driving gear operatively connected with said driving shaft, a fulcrum bar pivoted at one end and upon the opposite end of which said driving gear is journaled, a driven gear fixedly secured to the frame of the bed and meshing with said driving gear, a fulcrum bar pivoted at one end and upon the opposite end of which said driven gear is journaled, said last named fulcrum bar having an operative connection with said driving shaft whereby when the said shaft has ceased its'operation the bed is held firmly in closed position.

4. In a wall bed, the combination of means for actuating said bed to its opened and closed positions, comprising a driving shaft, a driving gear, an eccentric arm mounted on said driving shaft, a link pivotally connecting said eccentric arm with said driving gear, a driven gear fixedly secured to the frame of the bed and meshing with said driving gear, and counterbalancing means operatively connected with said driving gear and adapted to be actuated by the rotation of the latter.

5. In a wall bed, the combination of power transmitting means for actuating said bed to its opened and closed positions, comprising a driving shaft operatively connected with said power transmitting means, a driving gear operatively connected with said driving shaft, a driven gear fixedly secured to the frame of the bed and meshing with said driving gear, fulcrums upon which said driving gear and driven gear are respectively pivoted whereby the positions of the axes of the pivots of said gears are moved while said gears maintain their meshing relation to each other, and counterbalancing means operatively connected with said driving gear and adapted to be actuated by the rotation of the latter.

6. In a wall bed, a combination of means for actuating the bed to its opened and closed positions, comprising a power transmitting shaft, a driving gear operatively connected with said driving shaft, a fulcrum upon which said driving gear is pivoted whereby the position of the axis of the pivot of said driving gear moves with the movement of the bed, and tension means operatively connected with said driving gear.

7. In a wall bed, the combination of means for actuating said bed to its opened and closed posi tions, comprising a journaled shaft, a driving gear operatively connected with said shaft, a fulcrum upon which said driving gear is journaled, a separately-fulcrumed driven gear fixedly secured to the frame of the bed and meshing with said driving gear, and means for transmitting power to said shaft. 7

8. In a Wall bed, the combination of means for actuating the bed to its opened and closed positions, comprising a driving shaft, a driving gear operatively connected with said driving shaft, a driven gear fixedly secured to the frame of said bed and meshing with said driving gear, a fulcrum bar pivoted at one end and upon the opposite end of which said driven gear is journaled, and an arm fixed to said fulcrum bar and ope able through engagement with an element fixed to said driving shaft to thrust the bed to a firmly closed position.

9. In a wall bed, the combination of a pivotally mounted driven gear fixedly secured to the bed frame and adapted to rotate about its pivot to actuate the bed, a power transmitting shaft, a pivotally mounted driving gear operable by said shaft and adapted to rotate in mesh with said driven gear, and interconnected fulcrum bar supports for said gears engageable by an element fixed to said shaft for variation in the positions of said gear axes in progressive relation with the movement of said bed.

10. In a wall bed having a power transmitting shaft, a driving gear journaled eccentrically to said power transmitting shaft, crank means on said shaft link-connected with said driving gear and a driven gear fixed to the bed frame in meshing relation with said driving gear, counterbalancing tension means link-connected through independently pivoted bell-crank means with said driving gear and operable through rotation of the latter to exert greater counterbalancing ten sion as the bed is moved to its opened position.

11. In a wall bed, the combination of a pivotally mounted driven gear fixedly secured to the bed frame and adapted to rotate to actuate the bed, a power transmitting shaft, and a compound fulcrum connecting between said shaft and said driven gear operable to vary the position of the pivot of said driven gear in supplemental relation with the movement of said bed during that portion of the bed actuation adjacent but one limit of its range of travel.

12. In a wall bed, the combination of a pivotally mounted driven gear fixedly secured to the bed frame and adapted to rotate about its pivot to actuate the bed, a power transmitting shaft, means operable to transmit rotation of said shaft to effect rotation of said gear, and a compound fulcrum connection between said shaft and said driven gear operable to vary the position of the axis of the pivot of said driven gear during a fractional portion of and adjacent but one limit of the rotation of said driven gear.

13. In a wall bed, the combination of a pivotally mounted driven gear fixedly secured to the bed frame and adapted to rotate about its pivot to actuate the bed, means operable to rotate said gear, and compound fulcrum means supporting said gear axis and operable through engagement with said gear rotating means to move said gear axis in supplemental relation with the bed movement during a fractional portion of the bed actuation adjacent but one limit of its range of travel.

14. In a wall bed, the combination of a pivotally mounted driven gear fixedly secured to the bed frame and adapted to rotate about its pivot to actuate the bed, means operable to rotate said gear, and compound fulcrum means supporting said gear axis and operable through engagement with said gear rotating means during a fractional portion of its range of travel to vary the position of said gear axis adjacent but one limit of said gear rotation,

ELMER H. BRIDENBAUGI-I.

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