EP0592425A4 - Reclining chair mechanism - Google Patents
Reclining chair mechanismInfo
- Publication number
- EP0592425A4 EP0592425A4 EP9191915324A EP91915324A EP0592425A4 EP 0592425 A4 EP0592425 A4 EP 0592425A4 EP 9191915324 A EP9191915324 A EP 9191915324A EP 91915324 A EP91915324 A EP 91915324A EP 0592425 A4 EP0592425 A4 EP 0592425A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- link
- legrest
- carrier
- attaching
- drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/034—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest
- A47C1/035—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts including a leg-rest or foot-rest in combination with movably coupled seat and back-rest, i.e. the seat and back-rest being movably coupled in such a way that the extension mechanism of the foot-rest is actuated at least by the relative movements of seat and backrest
Definitions
- the present invention relates to the art of reclining chairs, and more particularly to three- way reclining chairs having six-bar linkages.
- the linkage mechanism of a reclining chair controls and coordinates movement of the back, seat, and legrest of the chair during reclining action.
- the legrest In the chair's full upright, or closed, position, the legrest is usually positioned just
- the legrest is stored underneath the seat in a horizontal position. In such a configuration, however, the reclining and inclining action of the chair is similar to that
- legrest 20 for a configuration where the legrest is at a right angle to the seat.
- a three-way reclining chair is one in which the back and seat of the chair move relative to each other during reclining movement.
- a two-way reclining chair is one in which the back and seat of the chair move relative to each other during reclining movement.
- Reclining chairs often require the use of springs or friction devices, or both, somewhere in the linkage to balance the chair in the full upright position, so that it does not recline without some effort put forth by an occupant. With wear of the friction devices, the chair will often recline spontaneously when in its full upright position. This situation is exacerbated when the chair is occupied, since more weight is placed on the back of the chair.
- sequencing devices are employed to activate the correct linkages at the proper time during reclining movement. These sequencing devices are often used in addition to springs or friction devices, or both, to help balance and. move the chair correctly. All of these devices are often noisy and cumbersome, and add to the cost of manufacture. Some friction devices are also prone to prematurely wear the links to which they are attached.
- the present invention provides a reclining chair having a simple and economical six-bar linkage system that is balanced so as to stay in closed position and reclining balance without sequencing devices, friction devices, or springs.
- the chair's continuing balance allows the occupant to recline the chair to any degree between slightly reclined and fully reclined positions.
- the invention also eases egress from the chair by allowing the occupant to place his feet directly beneath him.
- a reclining chair mechanism comprises a base link, a back link, means for pivotally attaching the base link to the back link, a seat link having a front and a rear, means for pivotally attaching the rear of the seat link to the back link, a drive link having a front and rear, means for pivotally attaching the rear of the drive link to the back link, a legrest link, means for pivotally attaching the legrest link to the front of the seat link, a carrier link, means for pivotally attaching the carrier link to the base link, means for operatively attaching the front of the drive link to the carrier link, and means for operatively attaching the legrest link to the carrier link.
- the legrest link is positioned at an angle underneath the seat link when the chair is in a full upright position.
- the carrier link is operatively attached to the front of the drive link by pivotally attaching to the front of the drive link
- the carrier link is operatively attached to the legrest link by pivotally attaching the legrest link to the front of the drive link.
- initial activation of the linkage causes the back link to rotate in a first direction, causing the drive link, constrained by the motion of the carrier link, to swing the legrest link out from under the seat link.
- the chair is now in reclining balance, and the occupant may now assume any position of recline, characterized by further rotation of the back link and legrest link and elevation of the front of the seat link.
- Full recline is reached when the carrier link, having rotated in said first direction from a full upright position, toggles with the drive link, preventing the latter from moving any farther . under the force of rotation of the back link.
- the movement of the linkage is thus arrested.
- the reclining action may then be reversed to return the chair to any intermediate reclining position, or to a full upright position.
- the links are configured such that initial activation of recline requires some effort on the part of the occupant. Therefore, until the chair is in a slightly reclined position, the chair will tend to return to full upright position. This prevents spontaneous recline of the chair, with no need for external devices.
- an attendant may lift the front of the seat frame and the top of the back frame to bring the chair into "heart-rest" position, a position in which the seat frame, back frame, and legrest assume the position of a lounge chair that has been tilted approximately 45 degrees with the occupant's back, seat, and legs supported.
- the mechanism permits this position due to the cyclical action of the linkage, i.e., the carrier link continues in said first direction while reversing the direction of rotation of the drive link, legrest link, and back link.
- FIG. 1 is a side elevational view of a reclining chair having the pre erred embodiment of a reclining chair mechanism of the present invention, showing the chair in a full upright position;
- FIG. 2 is a perspective view of the chair of Fig. 1;
- FIG. 3 is a top plan view of the chair of Fig. 1;
- FIG. 4 is a perspective view of an optional friction/locking device for use with the chair of Fig. 1;
- FIG. 5 is a side elevational view of the chair of Fig. 1, with the chair in transport, or slightly reclined, position;
- FIG. 6 is a side elevational view of the chair of Fig. 1, with the chair in an intermediate recline position
- FIG. 7 is a side elevational view of the chair of Fig. 1, with the chair in a fully reclined position
- FIG. 8 is a side elevational view of the chair of Fig. 1, with the chair in a heart-rest position;
- FIG. 9 is a side elevational view of a reclining chair having a second embodiment of a reclining chair mechanism according to the present invention, with the chair in a full upright position;
- FIG. 10 is a side elevational view of the chair of Fig. 9, with the chair in an intermediate recline position;
- FIG. 11 is a side elevational view of the chair of Fig. 9, with the chair in a full recline position.
- the present invention will be described with reference to a reclining chair 10, shown in Fig. 1, but it will be appreciated that the present invention can be used in other reclining chairs as well.
- the chair's base, back, seat, and legrest themselves constitute part of the linkage, which, by nature of their width, are components of both side linkage mechanisms at once.
- Other embodiments of the invention may instead provide side links to be attached to the above-named chair components.
- the invention's principles of linkage movement are the same in either case.
- Other embodiments of the invention will be apparent to those skilled in the art.
- FIGs. 1-3 depict a reclining chair 10 in a full upright, or closed, position, having a base frame assembly 12, a back frame assembly 14, a seat frame assembly 16, two drive link assemblies 18, a legrest assembly 20, and two carrier links 22.
- the base frame assembly 12 comprises two curved armrest bars 24.
- the intermediate sections of the armrest bars 24 act as the arms of the chair while the end portions of the bars 24 approach the floor.
- a longitudinal support 26 is bolted, by means of bolts 27 at the front and rear ends of the support 26, to the . front and rear lower portions, respectively, of each armrest bar 24.
- Two cross supports 28 and 29 are welded at their ends to the longitudinal supports 26, thereby forming an H-frame supporting the armrest bars 24.
- the cross support 28 is disposed toward the rear of the base frame assembly 12, while the cross support 29 is disposed slightly forward of the midpoint of the longitudinal supports 26, whereby the legrest assembly 20 rests against it when the chair 10 is in a full upright position.
- a locking device support beam 30 is bolted at its ends between the armrest bars 24, a few inches above the H-frame formed by supports 26, 28, and 29, at the rear of the chair 10, by bolts 33.
- a locking device 68, described below, is mounted on support beam 30 and a back support bar 38, described below.
- the armrest bars 24 are composed of 16 gauge steel, cold rolled and electric welded into 1 1/4" diameter cylindrical tubing.
- the longitudinal supports 26 and the cross supports 28 are composed of 1" x 2 " 18 gauge steel rectangular tubing. Other material of suitable strength can be used, as is well known.
- Casters 31 are affixed in a conventional manner to the ends of the armrest bars 24, whereby the chair 10 may easily move over a floor, an inclined ramp, etc.
- the brackets 32 and 34 consist of generally flat steel plates with an offset curvature and a curvature where they attach to the armrest bars 24.
- the back frame assembly 14 comprises a U- shaped bar 36, the arms of which are generally straight with slight curves to increase comfort, and generally vertical when the chair 10 is in closed position.
- a back support bar 38 connects the arms of the U-shaped bar 36 at points located slightly above the brackets 32 of the armrest bars 24.
- the U-shaped bar 36 and the back support bar 38 are composed of 1 1/4" x 5/8" 16 gauge steel flat oval tubing. The tubing is flattened at the ends of the arms of the U-shaped bar 36 to form plates 39.
- the brackets 32 of the armrest bars 24 pivotally attach to the arms of the U-shaped bar 36 at pivot points 40.
- the pivot points 40 each comprise a removable nylon shoulder brushing disposed through one of the brackets 32 and one arm of the U-shaped bar 36.
- the other pivot points of the chair 10 permanently riveted in the preferred embodiment, although other means of pivotal attachment will be apparent to those skilled in the art. All embodiments of the present invention described herein employ pivot points of similar construction to the corresponding pivot points in the chair 10.
- the seat frame assembly 16 comprises two length supports 42 and two cross supports 44, all made of 16 gauge steel, 7/8" diameter cylindrical tubing in the preferred embodiment. The tubing is flattened at the back end of each length support 42 to form flat curved plates 46.
- the curved plates 46 are pivotally attached in the above- described manner to the back frame assembly 14 at pivot points 48, which are located 1.216" below pivot points 40 when the chair 10 is in full upright position.
- This arrangement of pivot points 48 below pivot points 40 is preferred, but the invention also contemplates attachment of the seat frame assembly 16 to the back frame assembly 14 at other distances, or at pivot points which are level with or slightly above pivot points 40, either on the armrest bars 24 or on brackets protruding therefrom.
- the attachment of the seat frame assembly to the back frame assembly is level with the attachment of the back frame assembly to the base frame assembly.
- the length supports 42 of the seat frame assembly 16 are straight except for the curved plates 46 on their back ends and a slight downward curve near their front ends.
- the tubing of the length supports 42 in the preferred embodiment is flattened at the front end of each length support 42 to form plates 50.
- the two cross supports 44 are welded at their ends to the length supports 42 and curve downwardly at their middle to accommodate body shape and padding.
- the cross supports 44 and the length supports 42 thus form an H-frame.
- the seat frame assembly 16 is generally horizontal when the chair 10 is in full upright position, as shown in Figs. 1 and 2.
- the legrest assembly 20 comprises a generally
- U-shaped platform bar 52 made of 7/8" diameter 16 gauge steel cylindrical tubing in the preferred embodiment, and two hooked steel plates 54.
- One arm of each hooked plate 54 is welded to each end of the platform bar 52, and curved to accommodate the shape of the tubing.
- the apices of the hooked plates 54 are pivotally attached to the plates 50 of the seat frame assembly 21 at pivot points 56, located 20.588" from pivot points 48, which attach the seat frame assembly 16 to the back frame assembly 14.
- the legrest assembly 20 When the chair 10 is in a full upright position, the legrest assembly 20 is angled so that the lower end of the platform bar 52 is tucked underneath the seat frame assembly 16, as shown in Figs. 1 and 2. This positioning of the legrest assembly 20 allows the occupant to place his feet underneath the chair 10, thereby more directly supporting his weight during egress.
- the legrest assembly 20 may be angled in the closed position anywhere from 0 to 90 degrees relative to vertical, as desired.
- Each drive link assembly 18 comprises, in the preferred embodiment, a length of straight 16 gauge steel 7/8" diameter cylindrical tubing 57, flattened at its back end to form a plate 58.
- the plates 58 are pivotally attached to the plates 39 on the lower ends of the back frame 14 at pivot points 62, which are located 8.187" from pivot points 48.
- the tubing of the drive link assemblies 18 is flattened at the front ends of the assemblies to form plates 63.
- the plates 63 are pivotally attached to the ends of the hooked plates 54 of the legrest assembly 20 at pivot points 64, located 3.470" from pivot points 56, which attach the seat frame assembly 16 to the legrest assembly 20.
- a steel triangular plate 60 is bolted to the front end of each drive link 18 to form an offset or bellcrank point 61, 4.559" from pivot points 64. Bars forming a triangle or other suitable means of providing a bellcrank point could be used.
- the carrier links 22 are preferably composed of 0.150" flat sheet steel elongated plates, and are positioned slightly behind vertical when the chair 10 is in the full upright position of Figs. 1-3.
- the top ends of the carrier links 22 are pivotally attached to the brackets 34 protruding from the armrest bars 24 at pivot points 66.
- the bottom ends of the carrier links 22 are pivotally attached to the bellcrank points 61 on the triangular plates 60, 5.787" from pivot points 66.
- the width of the chair 10 may be varied without affecting the movement of the linkage.
- the distance between the pivot points may also be varied while retaining the nature of linkage movement herein described, and contemplated by the invention, as will be apparent to those skilled in the art.
- the legrest assembly 20 may be attached to the carrier links 22 instead of the drive links 18.
- the bellcrank plates 60 may be eliminated, if desired, whereby the carrier links 22 may be attached to other points on the drive links 18, or on the legrest 20, or on pivot points 64 themselves, as in the embodiment of Figs. 9- 11.
- Other bellcrank points may be provided in other locations in the linkage, and on other links.
- the platform bar 52 of the legrest assembly 20 may be eliminated if a legrest is not desired, whereby the hooked plates 54 would act as connector links.
- Other variations and modifications will be apparent to those skilled in the art.
- an optional friction and locking device 68 is attached to the rear of the chair 10. Friction devices are not needed to balance the chair 10 in reclining position or to stabilize it in closed position, as the inherent balance of .the linkage accomplishes those ends. However, it is useful for some applications, as will be described below.
- the locking device 68 preferably comprises a plurality of baffle plates 70, though one would suffice, each having a slot 72 (Fig. 1) slidably engaged on a rod 74.
- the rod 74 is mounted on two prongs 76 and 77, which are welded to and protrude from the locking device support beam 30.
- the rod 74 is screwed into the prong 77, but turns freely in prong 76.
- the baffle plates 70 are disposed between the prongs 76 and 77.
- Flat nylon washers 78 are mounted on the rod 74 between the plates 70 and on the outer surfaces thereof. The washers 78 act as compressors in the locking device 68.
- a third prong 79 is welded to and protrudes from support beam 30, and is located apart from the prongs 76 and 77 toward the right of the chair 10.
- the rod 74 is also mounted on the prong 79, and turns freely in it.
- Prong 79 serves to stabilize the rod 74.
- the end of the rod 74 is bent to form a handle 75 at the right side of the chair 10. When the locking device 68 is in the unlocked position, the handle 75 points upwardly.
- a steel washer 89 is provided on the rod 74 at the side of the nylon washers 78 facing the prong 76.
- a locking clamp collar 90 locks the washer 89 snugly against the washers 78.
- the baffle plates 70 are pivotally mounted on a clevis pin 84 at their opposite end.
- the pin 84 is mounted on a two-pronged bracket 86, which is welded to the back support bar 38, with a hair spring cotter pin.
- a second set of nylon washers 88 is mounted on the pin 84 between the plates 70 and on the outside surfaces thereof. If desired, the washers 88 may be compressed to slow or prevent rotational movement of the baffle plates 70 around the pin 84.
- the back support bar 38 moves relative to the support beam 30, causing the baffle plates 70 to slidably move along their slots 72 relative to the rod 74 and the nylon washers 78.
- the locking clamp collar 90 is placed to press the nylon washers 78 against the prong 77 when the device 68 is in unlocked position. If it is desired to lock the linkage against reclining movement of any kind, the occupant, or an attendant, moves the handle 75 from an upwardly pointing position to a downwardly pointing position.
- This action rotates the rod 74, causing it to screw out of the prong 77 toward the right (the screw threads of the prong 77 and rod 74 being configured to accomplish that end) .
- This action causes the nylon washers 78 to press forcefully against prong 77, and press baffle plates 70 forcefully between them, preventing the latter's sliding movement.
- The. linkage is unlocked by reversing the movement of the handle 75. Such locking is necessary if it is desired to put the chair into a heart-rest position, as described below. It is also helpful if the chair is transported while in a reclining position.
- the occupant To initially recline the chair 10, the occupant must press against the back frame assembly 14 while pressing against the floor with his feet or against the armrest bars 24 with his hands or arms.
- the linkage is arranged whereby initial recline requires some effort, thereby guarding against spontaneous recline.
- the initial activation of recline continues until the linkage is approximately in the transport position, shown in Fig. 5, which is convenient for lounging or translational movement.
- the chair 10 is in reclining balance from transport position to fully reclined position, shown in Fig. 7. An occupant of the chair 10 may thus move the chair 10 from transport position to any degree of recline merely by bending or straightening at the waist or knees, or both.
- the back frame assembly 14 is rotated counter-clockwise around pivot points 40.
- the drive link assemblies 18 are pushed forward by the bottom of the back frame assembly 14 at pivot points 62.
- the front ends of the drive link assemblies 18, at the bellcrank points 61 cause the bottom of the carrier links 22 to rotate about the base frame.
- asse bly 12 at pivot points 66 from an initial angle behind vertical to a slightly forward of vertical.
- the movement of the carrier links 22 in turn forces the bellcrank points 61 of the drive link assemblies 18 down slightly.
- the seat frame assembly 16 moves forward slightly, pushed forward by the back frame assembly 14 at pivot points 48.
- the front end of the seat frame assembly 16 is raised by the forward movement of the drive link assemblies 18. This action is caused by the forward movement of the drive link assemblies 18, which pushes forward the ends of the hooked plates 54 of the legrest assembly 20, at pivot points 64, causing the legrest assembly 20 to rotate around pivot points 56, which attach the apices of the hooked plates 54 to the front of the seat frame assembly 16. Due to the rotationally changed position of the hooked plates 54, the vertical component of the constant distance between pivot points 64 at the front ends of the drive link assemblies 18, and pivot points 56 at the front ends of the seat frame assembly 16, is greater than when the chair 10 is in full upright position.
- the forward end of the seat frame 16 is forced up. As explained above, however, the carrier links 22 do cause some downward movement of the front of the drive links 18, reducing the distance the front end of the seat frame 16 is raised.
- the forward movement of the drive link assemblies 18 also causes the legrest assembly 20 to rotate a relatively great distance, as compared to the movement of the rest of the linkage, out from under the seat frame assembly 16.
- the legrest assembly 20 rotates from an angle behind vertical to an angle slightly forward of vertical.
- the chair 10 is stable in the full upright position shown in Figs. 1-3, i.e, it has no tendency spontaneously to recline.
- the balance of the linkage is such that the chair 10 tends toward full upright position if placed in any position between full upright and transport positions.
- This stability is due to the relatively fast initial travel of the legrest assembly 20 required to reach transport position, compared to the back frame assembly 14 and seat frame assembly 16.
- the stability is also due to the fact that the carrier links 22 do not pass their balance points until transport position is reached.
- the initial activation stage is completed and the chair 10 is in reclining balance.
- the occupant may now assume any position between transport position and full recline by bending or straightening at the waist or knees, or both.
- Fig. 6 shows the chair 10 in an exemplary intermediate recline position.
- the occupant straightens his waist and knees and presses against the back frame assembly 14, causing it to again rotate counter-clockwise around pivot points 40.
- the bottom end of the back frame assembly 14 pushes the drive link assemblies 18 forward at pivot points 62, and pushes the seat frame assembly 16 slightly forward at pivot points 48.
- the drive links assemblies 18, in turn, at bellcrank points 61 force the carrier links 22 to further rotate counter- clockwise from generally vertical to approximately 45 degrees from vertical, thus raising the forward ends of the drive link assemblies 18.
- the legrest assembly 20 rotates counter-clockwise, driven by the drive link assemblies 18 at pivot points 64, around pivot points 56 to an angle at which the platform bar 52 is approximately 40 degrees below horizontal.
- the front of the seat frame assembly 16 is raised by the elevation of the front ends of the drive link assemblies 18.
- the former does not rise as much as the latter, however, since the rotation of the legrest assembly 20 slightly reduces the vertical distance between the pivot points 56 and 64, through which the seat frame assembly 16 and the drive link assemblies 18 are connected.
- Fig. 7 depicts the chair 10 in full recline position.
- the occupant again presses against the back frame assembly 14 while straightening at the waist and knees.
- This action causes the back frame assembly 14 to further rotate counter-clockwise about pivot points 40 on the base frame assembly 12, forcing the drive link assemblies 18 forward at pivot points 62. Since pivot points 62 at the bottom of the back frame assembly 14 describe the right side arc of a circle at this point, the drive link assemblies 18 do not move forward to the same degree that they did during initial recline.
- the seat frame assembly 16 likewise is not pushed forward as much as in initial recline of the chair 10, since pivot points 48, attaching the seat frame assembly 16 to the back frame assembly 14, begin at this point to describe the right side arc of a circle around pivot points 40, imparting less forward movement to the seat frame assembly 16,
- the bellcrank points 61 at the ends of the carrier links 22 likewise describe the right side arc of a circle around pivot points 66.
- the drive link assemblies 18 and legrest assembly 20 are not forced forward, but rather are pushed up. The rotation of the legrest assembly 20, therefore, is minimal. The net effect is to raise the front of the seat frame assembly 16 and the legrest assembly 20 while lowering the top of the back frame assembly 14.
- a "heart-rest” position is shown into which the chair 10 can be put with the assistance of an attendant.
- the ,_eart-rest position is used to relieve pressure on the torso of an occupant of the chair 10 by raising the back frame assembly 14 and the front of the seat frame assembly 16. This placement of these components of the chair distributes pressure to the back and legs of the occupant, reducing pressure in the area of the heart.
- the heart- rest position is reached by pulling up the forward end of the seat frame assembly 16 and the top part of the back frame assembly 14. Handles at these locations may be provided to give the attendant a place to grab.
- the heart-rest position is made possible by the circular movement of the carrier links 22. As explained above, when the chair 10 reaches the full recline position, Fig.
- the back frame assembly 14 it is not possible for the back frame assembly 14 to rotate counter- clockwise any farther. If the occupant moves the chair 10 back into an intermediate recline or transport recline position, Figs. 5 and 6, or to full upright position, Figs. 1-3, the carrier links 22 reverse rotation and retrace their path, going now in a clockwise direction, and all the other links do likewise. If an attendant moves the chair 10 into heart-rest position, however, the carrier links 22 continue on their counter ⁇ clockwise path. The attendant lifts the front of the seat frame assembly 16, which causes the legrest assembly 20 to be elevated at pivot points 56. The carrier links 22 constrain the upward movement of the legrest assembly 20 through their connections to the drive link assemblies 18 at the bellcrank points 61 and pivot points 64, respectively.
- the carrier links 22 complete the right side arc of their circular path, displacing the bellcrank points 61 mostly in a vertical direction, which causes little horizontal displacement of the drive link assemblies 18 and thus little clockwise rotation of the back frame assembly 14.
- the bellcrank points 61 trace more of the top arc of their circle, thereby rapidly horizontally displacing the drive link assemblies 18 and rotating the back frame assembly 14 in a clockwise direction.
- the horizontal movement of the drive link assemblies 18 overtakes the horizontal movement of the seat frame assembly 16, and pivot points 56 begin to act more as points of rotation for the legrest assembly 20, since pivot points 64 are being pulled to the rear by the rearward movement of the drive link assemblies 18 and carrier links 22.
- the legrest assembly 20 therefore rotates in a clockwise direction.
- the locking device 68 must be applied, by rotating the handle 75, to keep the chair 10 in the heart-rest position since the chair 10 has been forced out of its natural reclining balance by the action of the attendant, and will lapse back into it if not restrained.
- the chair 10 need not be locked in the exact position shown in Fig. 8; a position of greater or lesser degree may be desired.
- the chair 10 may be taken apart and folded for shipment by . removing the bolts 27 attaching the longitudinal supports 26 of the base frame assembly 12 to the armrest bars 24, thus removing the H-frame comprising the longitudinal supports 26 and cross supports 28 and 29.
- the locking device 68 may be removed from its attachment to the chair by removing the support beam 30 (through removal of the bolts 33) , and by removing the bolt 84 in the back support bar 38.
- the support beam 30 is detached from the armrest bars 24 by removing the bolts 33.
- the back frame assembly 14, seat frame assembly 16, drive link assemblies 18, legrest assembly 20, and carrier links 22 may then be disassembled thereby creating a compact package for shipping.
- Fig. 9 depicts another reclining chair 110 according to the present invention, and illustrates some of the modifications which may be made to the linkage while still remaining within the scope of the invention.
- the chair 110 comprises a base frame assembly 112, a back frame assembly 114, a seat frame assembly 116, drive links 118, a legrest assembly 120, and carrier links 122.
- the seat frame assembly 116 is pivotally attached to the back frame assembly 114 at pivot points 148.
- Level with pivot points 148, brackets 149 project forwardly from the back frame assembly 114, pivotally attaching the back frame assembly 114 to the base frame assembly 112 at pivot points 140. The effect is to make pivot points 140 and 148 level to each other.
- the carrier links 122 and legrest assembly 120 attach at coincident pivot points 164 on the drive links 118.
- the carrier links 122 are thus attached to the drive links 118 at higher points than their counterparts in Figs. 1-8, which causes the attachment of the carrier links 122 to the . base frame assembly 112 to be higher as well, raising much of the carrier links 122 above the level of the seat frame assembly 116.
- a locking device is not needed for the chair 110 to be balanced in closed position.
- the chair 110 does not need a locking device to assume and remain in any reclined position.
- the chair 10 of Figs. 1-8 is capable of similar action without activation of the locking device 68.
- the chair 110 will not be able to remain in a heart-rest position, though it will be able to reach one in the same manner as the chair 10 in Figs. 1-8.
- the configuration of the drive links 118, the carrier links 122, and the legrest assembly 120 will not cause any appreciable difference in the way the chair 110 reclines, as compared to the chair 10 in Figs. 1-8. Since the carrier links 122 are attached to a different part of the drive links 118, the physical movement of the links takes a correspondingly shifted path, but the nature of movement remains the same.
- pivot points 148 describe a circle around pivot points 140, just as pivot points 48 describe a circle around pivot points 40 in Figs. 1-7.
- pivot points 148 are level with pivot points 140 in full upright position and thus travel the left side arc of the circle during initial activation, the initial rotation of the back frame assembly 114 will push the seat frame assembly 116 forward less than the seat frame assembly 16 is pushed during corresponding movement of the chair 10 in Figs. 1- 8, whereas while rotation continues, as shown in Fig.
- pivot points 148 will begin to describe the lower arc of the circle and impart more forward movement to the seat frame assembly 116. Since the seat frame assembly 116 moves forward less during initial reclining, its points of attachment to the legrest assembly 120, pivot points 156, will act more as points of rotation for the legrest assembly 120 driven by the drive links 118. Since the seat frame assembly 116 moves forward relatively more during subsequent recline, pivot points 156 will act less as points of rotation. The net effect is to make the rotation of the legrest assembly 120 slightly less uniform during reclining action than the rotation of the legrest assembly 20 in Figs. 1-8.
- the chair 110 can be placed in a heartrest position in a similar manner to the chair 10 in Figs. 1-8.
- the seat frame, back frame, and legrest may be covered by an elastomeric suspension such as "ULTRAFLEX" (a registered trademark of Ultraflex Co., High • Point, North Carolina) , or by other elastic webbing, which may take the form of sleeves which slide onto the back frame, seat frame, and legrest.
- the webbing may then be covered with a relatively thin, foam filled pad of proper weight and compression, resulting in a reasonably high level of comfort for the occupant.
- One of the armrest bars may be made to pivot to allow for egress from the chair at the side. Such pivoting arms are useful, e.g., for the elderly when the chair is used in home care or nursing homes.
- all components of the linkage may be composed of flat plates, bent as necessary to accommodate the movement of the linkage.
- the linkage would be installed on each side of the chair, the right side being the mirror image of the left, as is standard in the art.
- the back, seat, legrest, and other components of the chair would then be attached to the linkage.
- Offset points such as bellcrank points 61, may be added to aid in the reclining balance or to change the location of links.
- a lap table may be added to the chair, as well as additional accessories, including footrests, an intravenous feeding receptacle and lock, head and body bolsters, a hook for fluid bags, oxygen tank racks, and foot-drop prevent devices.
- a wider, stronger frame and raised hand supports at the front of the arms may be used for a chair intended for use with the grossly overweight.
- the addition of two self-propelled wheels to the frame, the wheels being preferably 24 inches in diameter, in conjunction with removable footrests and wheel locks, will convert the chair into a wheelchair recliner.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US72392591A | 1991-07-01 | 1991-07-01 | |
PCT/US1991/005830 WO1993000842A1 (en) | 1991-07-01 | 1991-08-14 | Reclining chair mechanism |
US723925 | 1996-10-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0592425A1 EP0592425A1 (en) | 1994-04-20 |
EP0592425A4 true EP0592425A4 (en) | 1994-09-28 |
Family
ID=24908276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP9191915324A Ceased EP0592425A4 (en) | 1991-07-01 | 1991-08-14 | Reclining chair mechanism |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0592425A4 (en) |
JP (1) | JP2693035B2 (en) |
CA (1) | CA2112572C (en) |
WO (1) | WO1993000842A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995024176A1 (en) * | 1994-03-07 | 1995-09-14 | Bioject, Inc. | Ampule filling device |
CA2204579C (en) * | 1997-05-06 | 2000-10-17 | Broda Enterprises Inc. | Reclining chair |
JP2001149163A (en) * | 1999-11-25 | 2001-06-05 | Fuji Iryoki:Kk | Chair structure |
US9713381B2 (en) * | 2015-06-11 | 2017-07-25 | Davis Furniture Industries, Inc. | Chair |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB206571A (en) * | 1922-08-05 | 1923-11-05 | Frederick Charles Shorter | Improvements relating to chairs, couches, and the like |
US2857954A (en) * | 1951-04-04 | 1958-10-28 | Inventors Entpr Inc | Adjustable chair |
US2820508A (en) * | 1954-01-28 | 1958-01-21 | Lorenz Anton | Article of repose with coordinated seat, back-rest and leg-rest |
US2796918A (en) * | 1954-09-15 | 1957-06-25 | Norman P Martin | Article of repose for supporting the body of a person |
US2929440A (en) * | 1957-10-11 | 1960-03-22 | Anton Lorenz | Leg rest mechanism for reclining articles of furniture |
SE366645B (en) * | 1971-12-02 | 1974-05-06 | Landstingens Inkopscentral |
-
1991
- 1991-08-14 JP JP3514287A patent/JP2693035B2/en not_active Expired - Fee Related
- 1991-08-14 CA CA 2112572 patent/CA2112572C/en not_active Expired - Fee Related
- 1991-08-14 WO PCT/US1991/005830 patent/WO1993000842A1/en not_active Application Discontinuation
- 1991-08-14 EP EP9191915324A patent/EP0592425A4/en not_active Ceased
Non-Patent Citations (2)
Title |
---|
No further relevant documents disclosed * |
See also references of WO9300842A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH06508268A (en) | 1994-09-22 |
CA2112572A1 (en) | 1993-01-21 |
EP0592425A1 (en) | 1994-04-20 |
WO1993000842A1 (en) | 1993-01-21 |
JP2693035B2 (en) | 1997-12-17 |
CA2112572C (en) | 1995-07-18 |
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