Powered chair with forward moving backrest when the backrest is reclined

Abstract

A new and improved powered chair wherein the same comprises a backrest assembly, a seat assembly, a footrest assembly, a powered chair framework assembly, and a linear actuator assembly, all connected together by means of a linkage assembly. More particularly, the linkage assembly effectively comprises a pantograph-type assembly which interconnects a pair of oppositely disposed backrest mounting plates to a pair of oppositely disposed seat plates such that when the powered chair backrest is moved from its upright position to a reclined position, the pair of oppositely disposed backrest mounting plates are effectively moved closer to the pair of oppositely disposed seat plates so as to effectively eliminate any gap which would otherwise be conventionally defined between the powered chair backrest and the powered chair seat.

Description

FIELD OF THE INVENTION

[0001] The present invention relates generally to powered chairs, and more particularly to a powered chair wherein the backrest is moved forwardly when the backrest is reclined so as to consistently and properly support the back of the chair occupant as well as to effectively eliminate any gap defined between the chair back and the chair seat.BACKGROUND OF THE INVENTION

[0002] Powered chairs, sofas, and love seats are of course well known and have become quite popular and desirable as furniture pieces in both residential and business office settings. As is also well known, such powered chairs usually comprise various different movable components or parts, such as, for example, an extendable footrest, a movable headrest, a reclinable backrest, and a movable seat. In addition, the backrest is usually mounted upon the seat plates upon which the seat of the powered chair is mounted. A conventional, PRIOR ART powered chair is disclosed within FIGS. 1 and 2 and is designated by the reference character 100. More particularly, it is seen that when the backrest 102 of the chair 100 is disposed at an upright position, as illustrated within FIG. 1, there is no gap between the backrest 102 and the seat 104, however, when the backrest is reclined backwardly, as illustrated within FIG. 2, there is a significant gap 106 defined between the backrest 102 and the seat 104. Accordingly, the backrest 102 does not properly and consistently support the back of the chair occupant. In addition, such disposition of the backrest 102 relative to the seat 104 can cause some discomfort to the chair occupant. Still further, in view of the gap 106 defined between the chair backrest 102 and the chair seat 104, when the backrest is moved from the upright position to the reclined position, foreign objects could fall into the gap 106, and then, when the backrest 102 is subsequently returned to the upright position from the reclined position, the gap 106 will effectively disappear, and in fact be closed, whereby the foreign objects will then be difficult to retrieve.

[0003] A need therefore exists in the art for a new and improved powered chair. Another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat. Yet another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat. Still another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat. Yet still another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant. Still yet another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap, which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat, whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant, and wherein the disposition and loss of foreign objects, between the backrest and seat, is effectively prevented as a result of the elimination of the formation of the gap between the backrest and seat.OVERALL OBJECTIVES OF THE INVENTION

[0004] Therefore, a first overall objective of the present invention is to provide a new and improved powered chair. Another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat. Yet another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat. Still another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat. Yet still another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant. Still yet another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap, which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat, whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant, and wherein the disposition and loss of foreign objects, between the backrest and seat, is effectively prevented as a result of the elimination of the formation of the gap between the backrest and seat.SUMMARY OF THE INVENTION

[0005] The foregoing and other objectives are achieved, in accordance with the principles and teachings of the present invention, through the provision of a new and improved powered chair wherein the same comprises a backrest assembly, a seat assembly, a footrest assembly, a powered chair framework assembly, and a linear actuator assembly, all connected together by means of a linkage assembly. More particularly, the linkage assembly effectively comprises a pantograph-type assembly which interconnects a pair of oppositely disposed backrest mounting plates to a pair of oppositely disposed seat plates such that when the powered chair backrest is moved from its upright position to a reclined position, the pair of oppositely disposed backrest mounting plates are effectively moved closer to the pair of oppositely disposed seat plates so as to effectively eliminate the aforenoted gap which would otherwise be conventionally defined between the powered chair backrest and the powered chair seat.BRIEF DESCRIPTIONS OF THE DRAWINGS

[0006] Various other features and attendant advantages of the present invention will be more fully appreciated from the following detailed description when considered in connection with the accompanying drawings in which like reference characters designate like or corresponding parts throughout the several views, and wherein:

[0007] FIG. 1 is a front, right side perspective view of a conventional, PRIOR ART, powered chair showing the backrest disposed at an upright position relative to the seat;

[0008] FIG. 2 is a front, right side perspective view of the conventional, PRIOR ART, powered chair, as shown in FIG. 1, showing, however, the backrest disposed at a reclined position relative to the seat;

[0009] FIG. 3 is a right side, elevational view of the new and improved linkage mechanism for a powered chair, as developed in accordance with the principles and teachings of the present invention, wherein the backrest is disposed at its upright position;

[0010] FIG. 4 is a right side, elevational view of the new and improved linkage mechanism for the powered chair, similar to that of FIG. 3, wherein, however, the backrest is disposed at its reclined position;

[0011] FIG. 5 is a left side, elevational view of the new and improved linkage mechanism for the powered chair, similar to that of FIG. 3, wherein, however, the backrest is disposed at its reclined position;

[0012] FIG. 6 is a partial, enlarged, right side elevational view of the new and improved linkage mechanism for the powered chair, when the various linkage components are in their relative positions corresponding to the backrest being disposed at its upright position, and as is also shown in FIG. 3;

[0013] FIG. 7 is a partial, enlarged, right side elevational view of the new and improved linkage mechanism for the powered chair, when the various linkage components are in their relative positions corresponding to the backrest being disposed at its reclined position, and as is also shown in FIG. 4; and

[0014] FIG. 8 is a left side perspective view of the entire powered chair mechanism wherein the backrest is disposed at its reclined position.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0015] Referring now to the drawings, and more specifically to FIG. 3 thereof, it is seen that the powered chair mechanism is disclosed and is generally indicated by the reference character 200. More particularly, it is seen that the powered chair mechanism comprises a backrest assembly 202, a seat assembly 204, a footrest assembly 206, a powered chair framework assembly 208, and a linear actuator assembly 210, all connected together by means of a linkage assembly 211. The backrest assembly 202 is seen to comprise a pair of oppositely disposed backrest mounting brackets 212 upon which the backrest 102 of the powered chair 100 is adapted to be fixedly mounted. Each one of the pair of oppositely disposed backrest mounting brackets 212 has a substantially T-shaped configuration, and it is seen that one of the lower corner regions of each one of the pair of oppositely disposed backrest mounting brackets 212 is pivotally connected to a pair of oppositely disposed rear support links 214, as at 215, while the other one of the lower corner regions of each one of the pair of backrest mounting brackets 212 is pivotally connected to a pair of oppositely disposed front support links 216, as at 217, and wherein, further, intermediate portions of the pair of oppositely disposed rear support links 214, and intermediate portions of the pair of oppositely disposed front support links 216, are pivotally connected together by means of a first pair of oppositely disposed straight links 218 as at 220,222. Continuing further, it is seen that lower end portions of each one of the pair of oppositely disposed rear support links 214 are pivotally connected to first ends of a first pair of oppositely disposed rotating links 224, as at 226, while second opposite ends of the first pair of oppositely disposed rotating links 224 are pivotally connected to first ends of a second pair of oppositely disposed rotating links 228 as at 230. In turn, the lower end portions of the pair of oppositely disposed front support links 216 are pivotally connected to upper end portions of a third pair of oppositely disposed rotating links 232 as at 234, while lower end portions of the third pair of oppositely disposed rotating links 232 are pivotally connected to first end portions of a fourth pair of oppositely disposed rotating links 236 as at 238. It is also seen that an intermediate portion of each one of the first pair of oppositely disposed rotating links 224 is pivotally connected to an intermediate portion of each one of the third pair of oppositely disposed rotating links 232 as at 240, while an intermediate portion of each one of the second pair of oppositely disposed rotating links 228 is pivotally connected to an intermediate portion of each one of the fourth pair of oppositely disposed rotating links 236 as at 242.

[0016] Continuing further, it is seen that a front-end portion of each one of the fourth pair of oppositely disposed rotating links 236 is pivotally connected to a pair of oppositely disposed seat plates 244 as at 246, as can best be seen in FIGS. 4-8, upon which the seat of the powered chair 100 is adapted to be fixedly secured, while a lower end portion of each one of the second pair of oppositely disposed rotating links 228 is pivotally connected to a lower end portion of each one of a first pair of oppositely disposed L-shaped pivoting links 248 as at 250. An upper end portion of each one of the first pair of oppositely disposed L-shaped pivoting links 248 is pivotally connected to each one of the pair of oppositely disposed seat plates 244 as at 252, while an upper end portion of each one of a pair of oppositely disposed rearward lift link 254 is pivotally connected to an upper terminal end portion of each one of the first pair of oppositely disposed L-shaped pivoting links 248 as at 256. It is also seen that the powered chair framework assembly 208 comprises a pair of oppositely disposed, longitudinally extending side frame members 258, a forward, transversely extending cross-frame member 260, and a rearward, transversely extending cross-frame member 262. The lower end portion of each one of the pair of oppositely disposed rearward lift links 254 is pivotally connected to a rearward end portion of a respective one of the pair of oppositely disposed, longitudinally extending side frame members 258, as at 264, while the lower end portion of each one of a pair of oppositely disposed forward lift links 266 is pivotally connected to a forward end portion of a respective one of the pair of oppositely disposed, longitudinally extending side frame members 258, as at 268.

[0017] In addition, it is seen that a second pair of oppositely disposed L-shaped pivoting links 270 are respectively pivotally connected to each one of the pair of oppositely disposed seat plates 244, as at 272, as can best be seen in FIG. 4, while upper end portions of the pair of oppositely disposed forward lift links 266 are pivotally connected to the second pair of oppositely disposed L-shaped pivoting links 270 as at 274. Still yet further, a pair of oppositely disposed interconnecting links 276 have forward end portions thereof pivotally connected to central portions of the pair of oppositely disposed forward lift links 266, as at 278, while rearward end portions of the pair of oppositely disposed interconnecting links 276 are pivotally connected to upper end portions of a third pair of oppositely disposed pivoting links 280 as at 282. In addition, it is seen that central portions of the third pair of oppositely disposed pivoting links 280 are pivotally connected to the pair of oppositely disposed seat plates 244, as at 284, as can best be seen in FIG. 4, while lower end portions of the third pair of oppositely disposed pivoting links 280 are pivotally connected to a fourth pair of oppositely disposed pivoting links 286 as at 288. Still further, it is seen that a fifth pair of oppositely disposed pivoting links 290 have rearward end portions pivotally connected to the first pair of oppositely disposed L-shaped pivoting links 248 as at 292, while forward end portions of the fifth pair of oppositely disposed pivoting links 290 are pivotally connected to the second pair of oppositely disposed L-shaped pivoting links 270 as at 294.

[0018] With reference continuing to be made to FIGS. 3-5, it is seen that the linkage assembly 211 further comprises a pair of oppositely disposed lower footrest swing links 296, wherein the rear end portions thereof are pivotally connected to the pair of oppositely disposed seat plates 244, as at 298, while forward end portions of the pair of oppositely disposed lower footrest swing links 296 are pivotally connected to rear end portions of a pair of oppositely disposed lower footrest extension links 300 as at 302. In turn, the pair of oppositely disposed lower footrest extension links 300 have their forward, upper end portions pivotally connected to a pair of oppositely disposed secondary, rearward footrest mounting brackets 304, as at 306, upon which the powered chair footrest is adapted to be fixedly secured. In a similar manner, it is seen that a pair of oppositely disposed upper footrest swing links 308 have their rear end portions pivotally connected to the pair of oppositely disposed seat plates 244, as at 310, while forward, intermediate portions of the pair of oppositely disposed upper footrest swing links 308 are pivotally connected to the pair of oppositely disposed lower footrest extension links 300 as at 312. Still further, it is seen that forward, terminal end portions of the pair of oppositely disposed upper footrest swing links 308 are pivotally connected to lower, rearward end portions of a pair of oppositely disposed upper footrest extension links 314, as at 316, and that upper, forward, terminal end portions of the pair of oppositely disposed upper footrest extension links 314 are pivotally connected to a pair of oppositely disposed main or primary, forward, footrest mounting brackets 318, as at 320, wherein the pair of oppositely disposed secondary, rearward footrest mounting brackets 304, and the pair of oppositely disposed main or primary, forward, footrest mounting brackets 318, cooperate together in supporting the powered chair footrest which is fixedly attached thereto.

[0019] Continuing still further, it is seen that intermediate portions of a pair of oppositely disposed first main bracket support links 322 are pivotally connected to intermediate portions of the pair of oppositely disposed upper footrest extension links 314, as at 324, while first terminal end portions of the pair of oppositely disposed first main bracket support links 322 are pivotally connected to the pair of oppositely disposed lower footrest extension links 300 as at 326. Second terminal end portions of the pair of oppositely disposed first main bracket support links 322 are pivotally connected to lower end portions of a pair of oppositely disposed second main bracket support links 328, as at 330, while upper end portions of the pair of oppositely disposed second main bracket support links 328 are pivotally connected to intermediate portions of the pair of oppositely disposed main or primary, forward, footrest mounting brackets 318 as at 332. Still further, first end portions of a second pair of oppositely disposed straight links 334, as can best be seen in FIG. 5, are pivotally connected to the forward end portions of the pair of oppositely disposed secondary, rearward footrest mounting brackets 304, as at 336, while second, opposite end portions of the second pair of oppositely disposed straight links 334 are pivotally connected to the pair of oppositely disposed second main bracket support links 328 as at 338.

[0020] A third pair of oppositely disposed straight links 340 are seen to be pivotally connected at a first terminal end portions thereof to central portions of the pair of oppositely disposed first main bracket support links 322 as at 342, while second opposite terminal end portions thereof are pivotally connected to a pair of oppositely disposed secondary footrest support links 344 as at 346. It is also seen that the upper end portions of the pair of oppositely disposed upper footrest extension links 314 are pivotally connected to intermediate portions of the pair of oppositely disposed secondary footrest support links 344 as at 348, and that the pair of oppositely disposed secondary footrest support links 344 cooperate together with the pair of oppositely disposed secondary, rearward footrest mounting brackets 304, and the pair of oppositely disposed main or primary, forward, footrest mounting brackets 318, in supporting the powered chair footrest which is fixedly attached thereto. As can also best be seen in FIG. 5, a pair of oppositely disposed arcuate links 350 are pivotally connected at the forward end portions thereof to intermediate portions of the pair of oppositely disposed lower footrest swing links 296 as at 352, while rear end portions of the pair of oppositely disposed arcuate links 350 are pivotally connected to first lower end portions of a fourth pair of oppositely disposed straight links 354 as at 356, the second, opposite, upper end portions of the fourth pair of oppositely disposed straight links 354 being fixedly connected to the pair of oppositely disposed seat plates 244 by means of a transversely extending cross-beam 358.

[0021] With reference now being made to FIG. 8, it is seen that the linear actuator assembly 210 comprises a linear actuator which includes a motor end 360 that is fixedly mounted upon the forward, transversely extending cross-frame member 260, and a lead screw housing 362 that extends from the motor end 360 to the rearward, transversely extending cross-beam 262 upon which it is fixedly secured by means of a suitable mounting bracket 364. The lead screw housing 362 contains a lead screw, not visible, which is operatively connected to a slide member 366 which is adapted to slide along the lead screw housing 362 as the lead screw, not shown, is rotated by means of the linear actuator motor 360. Still further, it is seen that a pair of oppositely disposed links 368 have rearward end portions thereof pivotally connected to a pair of oppositely disposed mounting brackets 370 which are fixedly mounted upon the slide member 366, while forward end portions of the pair of oppositely disposed links 368 are pivotally connected to a pair of transversely spaced brackets 372 which are fixedly mounted upon the transversely extending cross-beam 358.

[0022] Having described substantially all of the operative and structural components of the new and improved powered chair mechanism 200 of the present invention, a brief description of the system will now be described. More particularly, it is to be appreciated that when the linear actuator is actuated, the slide member 366 will move toward the front of the chair mechanism 200, that is, toward the left as viewed in FIG. 8. Accordingly, the pair of oppositely disposed links 368 will likewise move forwardly or toward the left, as seen in FIG. 8, as well as tending to rotate in the clockwise direction which will simultaneously cause the transversely extending cross-member 358 to move upwardly and forwardly whereby the pair of oppositely disposed seat plates 244 will likewise tend to move upwardly and forwardly. In addition, in view of the fact that the first pair of oppositely disposed L-shaped pivoting links 248 are pivotally connected to the pair of oppositely disposed seat plates 244, as at 252, while upper end portions of the pair of oppositely disposed rearward lift links 254 are pivotally connected to upper terminal end portions of the first pair of oppositely disposed L-shaped pivoting links 248, as at 256, then as the pair of oppositely disposed seat plates 244 move forwardly and upwardly, the first pair of oppositely disposed L-shaped pivoting links 248 will rotate in the counterclockwise direction around the pivotal connections 252 and also move upwardly. Still further, as can also be best appreciated from FIGS. 3, 4, 6, and 7, and remembering that the front-end portion of each one of the fourth pair of oppositely disposed rotating links 236 is also pivotally connected to the pair of oppositely disposed seat plates 244 as at 246, then as the pair of oppositely disposed seat plates 244 move upwardly and forwardly, the fourth pair of oppositely disposed rotating links 236 will pivot in the counterclockwise direction, as view in FIGS. 6 and 7, such that the angle a is increased as defined between the second pair of oppositely disposed rotating links 228 and the fourth pair of oppositely disposed rotating links 236.

[0023] In addition, due to the pivotal connection defined between the intermediate portion of each one of the second pair of oppositely disposed rotating links 228 and the intermediate portion of each one of the fourth pair of oppositely disposed rotating links 236, as at 242, the second pair of oppositely disposed rotating links 228 will be elevated so as to, in turn, not only cause the first pair of oppositely disposed rotating links 224 to rotate in the counterclockwise direction so as to increase the angle B, as defined between the third pair of oppositely disposed rotating links 232 and the first pair of oppositely disposed rotating links 224, but still further, in view of the pivotal connection defined between the third pair of oppositely disposed rotating links 232 and the first pair of oppositely disposed rotating links 224, as at 240, the third pair of oppositely disposed rotating links 232 will be elevated so as to, turn, cause the pair of oppositely disposed front support links 216 to rotate in the counterclockwise direction as a result of the pivotal connection defined between the third pair of oppositely disposed rotating links 232 and the pair of oppositely disposed front support links 216, as at 234, thereby causing the pair of oppositely disposed backrest mounting brackets 212 to move to their reclined positions. In addition, it is also seen that the third pair of oppositely disposed rotating links 232 will effectively move closer to the fourth pair of oppositely disposed rotating links 236 and to the second pair of oppositely disposed rotating links 228, as can best be appreciated from FIG. 7, as will the first pair of oppositely disposed rotating links 224, as the entire pantograph linkage system, comprising a first pantograph linkage arrangement comprising said links 236, 232, 224, 228, and a second pantograph linkage arrangement comprising said links 224, 214, 218, 232, is effectively collapsed or condensed in the forward direction.

[0024] Accordingly, as the pair of oppositely disposed backrest mounting brackets 212 are moved to their reclined positions, it is seen that the third pair of oppositely disposed rotating links 232, the pair of oppositely disposed front support links 216, and the pair of oppositely disposed backrest mounting brackets 212 will move toward the pair of oppositely disposed seat plates 244 so that, contrary to the pair of oppositely disposed backrest mounting brackets 212 conventionally moving away from the pair of oppositely disposed seat plates 224 when the pair of oppositely disposed backrest mounting brackets 212 are moved from their upright positions to their reclined positions, the pair of oppositely disposed backrest mounting brackets 212 will in fact move closer to the pair of oppositely disposed seat plates 244 such that any gap, which would otherwise develop between the powered chair backrest 102 and the powered chair seat 104, when the backrest is reclined relative to the seat, is effectively eliminated whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant, and wherein further, the disposition and loss of foreign objects, between the powered chair backrest 102 and the powered chair seat 104, is effectively prevented as a result of the elimination of the formation of the gap between the powered chair backrest 102 and the powered chair seat 104. Lastly, it is of course to be realized that when the powered chair backrest 102 is being moved from the reclined position to the upright position, the aforenoted linkage assembly 211 will effectively operate in reverse whereby the powered chair backrest 102 will move farther and farther apart from the powered chair seat 104 such that the powered chair backrest 102 will not impinge upon or compress the powered chair seat 104 during the movement of the powered chair backrest 102 from the reclined position to the upright position.

[0025] Obviously, many variations and modifications of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the present invention may be practiced otherwise than as specifically described herein.

Examples

Embodiment Construction

[0015]Referring now to the drawings, and more specifically to FIG. 3 thereof, it is seen that the powered chair mechanism is disclosed and is generally indicated by the reference character 200. More particularly, it is seen that the powered chair mechanism comprises a backrest assembly 202, a seat assembly 204, a footrest assembly 206, a powered chair framework assembly 208, and a linear actuator assembly 210, all connected together by means of a linkage assembly 211. The backrest assembly 202 is seen to comprise a pair of oppositely disposed backrest mounting brackets 212 upon which the backrest 102 of the powered chair 100 is adapted to be fixedly mounted. Each one of the pair of oppositely disposed backrest mounting brackets 212 has a substantially T-shaped configuration, and it is seen that one of the lower corner regions of each one of the pair of oppositely disposed backrest mounting brackets 212 is pivotally connected to a pair of oppositely disposed rear support links 214, a...

FIELD OF THE INVENTION

[0001] The present invention relates generally to powered chairs, and more particularly to a powered chair wherein the backrest is moved forwardly when the backrest is reclined so as to consistently and properly support the back of the chair occupant as well as to effectively eliminate any gap defined between the chair back and the chair seat.BACKGROUND OF THE INVENTION

[0002] Powered chairs, sofas, and love seats are of course well known and have become quite popular and desirable as furniture pieces in both residential and business office settings. As is also well known, such powered chairs usually comprise various different movable components or parts, such as, for example, an extendable footrest, a movable headrest, a reclinable backrest, and a movable seat. In addition, the backrest is usually mounted upon the seat plates upon which the seat of the powered chair is mounted. A conventional, PRIOR ART powered chair is disclosed within FIGS. 1 and 2 and is designated by the reference character 100. More particularly, it is seen that when the backrest 102 of the chair 100 is disposed at an upright position, as illustrated within FIG. 1, there is no gap between the backrest 102 and the seat 104, however, when the backrest is reclined backwardly, as illustrated within FIG. 2, there is a significant gap 106 defined between the backrest 102 and the seat 104. Accordingly, the backrest 102 does not properly and consistently support the back of the chair occupant. In addition, such disposition of the backrest 102 relative to the seat 104 can cause some discomfort to the chair occupant. Still further, in view of the gap 106 defined between the chair backrest 102 and the chair seat 104, when the backrest is moved from the upright position to the reclined position, foreign objects could fall into the gap 106, and then, when the backrest 102 is subsequently returned to the upright position from the reclined position, the gap 106 will effectively disappear, and in fact be closed, whereby the foreign objects will then be difficult to retrieve.

[0003] A need therefore exists in the art for a new and improved powered chair. Another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat. Yet another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat. Still another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat. Yet still another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant. Still yet another need exists in the art for a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap, which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat, whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant, and wherein the disposition and loss of foreign objects, between the backrest and seat, is effectively prevented as a result of the elimination of the formation of the gap between the backrest and seat.OVERALL OBJECTIVES OF THE INVENTION

[0004] Therefore, a first overall objective of the present invention is to provide a new and improved powered chair. Another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat. Yet another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat. Still another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat. Yet still another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant. Still yet another overall objective of the present invention is to provide a new and improved powered chair wherein, as the backrest is reclined, the backrest will be moved forwardly relative to the chair seat so as to effectively eliminate any gap, which would otherwise develop between the backrest and the seat when the backrest is reclined relative to the seat, whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant, and wherein the disposition and loss of foreign objects, between the backrest and seat, is effectively prevented as a result of the elimination of the formation of the gap between the backrest and seat.SUMMARY OF THE INVENTION

[0005] The foregoing and other objectives are achieved, in accordance with the principles and teachings of the present invention, through the provision of a new and improved powered chair wherein the same comprises a backrest assembly, a seat assembly, a footrest assembly, a powered chair framework assembly, and a linear actuator assembly, all connected together by means of a linkage assembly. More particularly, the linkage assembly effectively comprises a pantograph-type assembly which interconnects a pair of oppositely disposed backrest mounting plates to a pair of oppositely disposed seat plates such that when the powered chair backrest is moved from its upright position to a reclined position, the pair of oppositely disposed backrest mounting plates are effectively moved closer to the pair of oppositely disposed seat plates so as to effectively eliminate the aforenoted gap which would otherwise be conventionally defined between the powered chair backrest and the powered chair seat.BRIEF DESCRIPTIONS OF THE DRAWINGS

[0006] Various other features and attendant advantages of the present invention will be more fully appreciated from the following detailed description when considered in connection with the accompanying drawings in which like reference characters designate like or corresponding parts throughout the several views, and wherein:

[0007] FIG. 1 is a front, right side perspective view of a conventional, PRIOR ART, powered chair showing the backrest disposed at an upright position relative to the seat;

[0008] FIG. 2 is a front, right side perspective view of the conventional, PRIOR ART, powered chair, as shown in FIG. 1, showing, however, the backrest disposed at a reclined position relative to the seat;

[0009] FIG. 3 is a right side, elevational view of the new and improved linkage mechanism for a powered chair, as developed in accordance with the principles and teachings of the present invention, wherein the backrest is disposed at its upright position;

[0010] FIG. 4 is a right side, elevational view of the new and improved linkage mechanism for the powered chair, similar to that of FIG. 3, wherein, however, the backrest is disposed at its reclined position;

[0011] FIG. 5 is a left side, elevational view of the new and improved linkage mechanism for the powered chair, similar to that of FIG. 3, wherein, however, the backrest is disposed at its reclined position;

[0012] FIG. 6 is a partial, enlarged, right side elevational view of the new and improved linkage mechanism for the powered chair, when the various linkage components are in their relative positions corresponding to the backrest being disposed at its upright position, and as is also shown in FIG. 3;

[0013] FIG. 7 is a partial, enlarged, right side elevational view of the new and improved linkage mechanism for the powered chair, when the various linkage components are in their relative positions corresponding to the backrest being disposed at its reclined position, and as is also shown in FIG. 4; and

[0014] FIG. 8 is a left side perspective view of the entire powered chair mechanism wherein the backrest is disposed at its reclined position.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0015] Referring now to the drawings, and more specifically to FIG. 3 thereof, it is seen that the powered chair mechanism is disclosed and is generally indicated by the reference character 200. More particularly, it is seen that the powered chair mechanism comprises a backrest assembly 202, a seat assembly 204, a footrest assembly 206, a powered chair framework assembly 208, and a linear actuator assembly 210, all connected together by means of a linkage assembly 211. The backrest assembly 202 is seen to comprise a pair of oppositely disposed backrest mounting brackets 212 upon which the backrest 102 of the powered chair 100 is adapted to be fixedly mounted. Each one of the pair of oppositely disposed backrest mounting brackets 212 has a substantially T-shaped configuration, and it is seen that one of the lower corner regions of each one of the pair of oppositely disposed backrest mounting brackets 212 is pivotally connected to a pair of oppositely disposed rear support links 214, as at 215, while the other one of the lower corner regions of each one of the pair of backrest mounting brackets 212 is pivotally connected to a pair of oppositely disposed front support links 216, as at 217, and wherein, further, intermediate portions of the pair of oppositely disposed rear support links 214, and intermediate portions of the pair of oppositely disposed front support links 216, are pivotally connected together by means of a first pair of oppositely disposed straight links 218 as at 220,222. Continuing further, it is seen that lower end portions of each one of the pair of oppositely disposed rear support links 214 are pivotally connected to first ends of a first pair of oppositely disposed rotating links 224, as at 226, while second opposite ends of the first pair of oppositely disposed rotating links 224 are pivotally connected to first ends of a second pair of oppositely disposed rotating links 228 as at 230. In turn, the lower end portions of the pair of oppositely disposed front support links 216 are pivotally connected to upper end portions of a third pair of oppositely disposed rotating links 232 as at 234, while lower end portions of the third pair of oppositely disposed rotating links 232 are pivotally connected to first end portions of a fourth pair of oppositely disposed rotating links 236 as at 238. It is also seen that an intermediate portion of each one of the first pair of oppositely disposed rotating links 224 is pivotally connected to an intermediate portion of each one of the third pair of oppositely disposed rotating links 232 as at 240, while an intermediate portion of each one of the second pair of oppositely disposed rotating links 228 is pivotally connected to an intermediate portion of each one of the fourth pair of oppositely disposed rotating links 236 as at 242.

[0016] Continuing further, it is seen that a front-end portion of each one of the fourth pair of oppositely disposed rotating links 236 is pivotally connected to a pair of oppositely disposed seat plates 244 as at 246, as can best be seen in FIGS. 4-8, upon which the seat of the powered chair 100 is adapted to be fixedly secured, while a lower end portion of each one of the second pair of oppositely disposed rotating links 228 is pivotally connected to a lower end portion of each one of a first pair of oppositely disposed L-shaped pivoting links 248 as at 250. An upper end portion of each one of the first pair of oppositely disposed L-shaped pivoting links 248 is pivotally connected to each one of the pair of oppositely disposed seat plates 244 as at 252, while an upper end portion of each one of a pair of oppositely disposed rearward lift link 254 is pivotally connected to an upper terminal end portion of each one of the first pair of oppositely disposed L-shaped pivoting links 248 as at 256. It is also seen that the powered chair framework assembly 208 comprises a pair of oppositely disposed, longitudinally extending side frame members 258, a forward, transversely extending cross-frame member 260, and a rearward, transversely extending cross-frame member 262. The lower end portion of each one of the pair of oppositely disposed rearward lift links 254 is pivotally connected to a rearward end portion of a respective one of the pair of oppositely disposed, longitudinally extending side frame members 258, as at 264, while the lower end portion of each one of a pair of oppositely disposed forward lift links 266 is pivotally connected to a forward end portion of a respective one of the pair of oppositely disposed, longitudinally extending side frame members 258, as at 268.

[0017] In addition, it is seen that a second pair of oppositely disposed L-shaped pivoting links 270 are respectively pivotally connected to each one of the pair of oppositely disposed seat plates 244, as at 272, as can best be seen in FIG. 4, while upper end portions of the pair of oppositely disposed forward lift links 266 are pivotally connected to the second pair of oppositely disposed L-shaped pivoting links 270 as at 274. Still yet further, a pair of oppositely disposed interconnecting links 276 have forward end portions thereof pivotally connected to central portions of the pair of oppositely disposed forward lift links 266, as at 278, while rearward end portions of the pair of oppositely disposed interconnecting links 276 are pivotally connected to upper end portions of a third pair of oppositely disposed pivoting links 280 as at 282. In addition, it is seen that central portions of the third pair of oppositely disposed pivoting links 280 are pivotally connected to the pair of oppositely disposed seat plates 244, as at 284, as can best be seen in FIG. 4, while lower end portions of the third pair of oppositely disposed pivoting links 280 are pivotally connected to a fourth pair of oppositely disposed pivoting links 286 as at 288. Still further, it is seen that a fifth pair of oppositely disposed pivoting links 290 have rearward end portions pivotally connected to the first pair of oppositely disposed L-shaped pivoting links 248 as at 292, while forward end portions of the fifth pair of oppositely disposed pivoting links 290 are pivotally connected to the second pair of oppositely disposed L-shaped pivoting links 270 as at 294.

[0018] With reference continuing to be made to FIGS. 3-5, it is seen that the linkage assembly 211 further comprises a pair of oppositely disposed lower footrest swing links 296, wherein the rear end portions thereof are pivotally connected to the pair of oppositely disposed seat plates 244, as at 298, while forward end portions of the pair of oppositely disposed lower footrest swing links 296 are pivotally connected to rear end portions of a pair of oppositely disposed lower footrest extension links 300 as at 302. In turn, the pair of oppositely disposed lower footrest extension links 300 have their forward, upper end portions pivotally connected to a pair of oppositely disposed secondary, rearward footrest mounting brackets 304, as at 306, upon which the powered chair footrest is adapted to be fixedly secured. In a similar manner, it is seen that a pair of oppositely disposed upper footrest swing links 308 have their rear end portions pivotally connected to the pair of oppositely disposed seat plates 244, as at 310, while forward, intermediate portions of the pair of oppositely disposed upper footrest swing links 308 are pivotally connected to the pair of oppositely disposed lower footrest extension links 300 as at 312. Still further, it is seen that forward, terminal end portions of the pair of oppositely disposed upper footrest swing links 308 are pivotally connected to lower, rearward end portions of a pair of oppositely disposed upper footrest extension links 314, as at 316, and that upper, forward, terminal end portions of the pair of oppositely disposed upper footrest extension links 314 are pivotally connected to a pair of oppositely disposed main or primary, forward, footrest mounting brackets 318, as at 320, wherein the pair of oppositely disposed secondary, rearward footrest mounting brackets 304, and the pair of oppositely disposed main or primary, forward, footrest mounting brackets 318, cooperate together in supporting the powered chair footrest which is fixedly attached thereto.

[0019] Continuing still further, it is seen that intermediate portions of a pair of oppositely disposed first main bracket support links 322 are pivotally connected to intermediate portions of the pair of oppositely disposed upper footrest extension links 314, as at 324, while first terminal end portions of the pair of oppositely disposed first main bracket support links 322 are pivotally connected to the pair of oppositely disposed lower footrest extension links 300 as at 326. Second terminal end portions of the pair of oppositely disposed first main bracket support links 322 are pivotally connected to lower end portions of a pair of oppositely disposed second main bracket support links 328, as at 330, while upper end portions of the pair of oppositely disposed second main bracket support links 328 are pivotally connected to intermediate portions of the pair of oppositely disposed main or primary, forward, footrest mounting brackets 318 as at 332. Still further, first end portions of a second pair of oppositely disposed straight links 334, as can best be seen in FIG. 5, are pivotally connected to the forward end portions of the pair of oppositely disposed secondary, rearward footrest mounting brackets 304, as at 336, while second, opposite end portions of the second pair of oppositely disposed straight links 334 are pivotally connected to the pair of oppositely disposed second main bracket support links 328 as at 338.

[0020] A third pair of oppositely disposed straight links 340 are seen to be pivotally connected at a first terminal end portions thereof to central portions of the pair of oppositely disposed first main bracket support links 322 as at 342, while second opposite terminal end portions thereof are pivotally connected to a pair of oppositely disposed secondary footrest support links 344 as at 346. It is also seen that the upper end portions of the pair of oppositely disposed upper footrest extension links 314 are pivotally connected to intermediate portions of the pair of oppositely disposed secondary footrest support links 344 as at 348, and that the pair of oppositely disposed secondary footrest support links 344 cooperate together with the pair of oppositely disposed secondary, rearward footrest mounting brackets 304, and the pair of oppositely disposed main or primary, forward, footrest mounting brackets 318, in supporting the powered chair footrest which is fixedly attached thereto. As can also best be seen in FIG. 5, a pair of oppositely disposed arcuate links 350 are pivotally connected at the forward end portions thereof to intermediate portions of the pair of oppositely disposed lower footrest swing links 296 as at 352, while rear end portions of the pair of oppositely disposed arcuate links 350 are pivotally connected to first lower end portions of a fourth pair of oppositely disposed straight links 354 as at 356, the second, opposite, upper end portions of the fourth pair of oppositely disposed straight links 354 being fixedly connected to the pair of oppositely disposed seat plates 244 by means of a transversely extending cross-beam 358.

[0021] With reference now being made to FIG. 8, it is seen that the linear actuator assembly 210 comprises a linear actuator which includes a motor end 360 that is fixedly mounted upon the forward, transversely extending cross-frame member 260, and a lead screw housing 362 that extends from the motor end 360 to the rearward, transversely extending cross-beam 262 upon which it is fixedly secured by means of a suitable mounting bracket 364. The lead screw housing 362 contains a lead screw, not visible, which is operatively connected to a slide member 366 which is adapted to slide along the lead screw housing 362 as the lead screw, not shown, is rotated by means of the linear actuator motor 360. Still further, it is seen that a pair of oppositely disposed links 368 have rearward end portions thereof pivotally connected to a pair of oppositely disposed mounting brackets 370 which are fixedly mounted upon the slide member 366, while forward end portions of the pair of oppositely disposed links 368 are pivotally connected to a pair of transversely spaced brackets 372 which are fixedly mounted upon the transversely extending cross-beam 358.

[0022] Having described substantially all of the operative and structural components of the new and improved powered chair mechanism 200 of the present invention, a brief description of the system will now be described. More particularly, it is to be appreciated that when the linear actuator is actuated, the slide member 366 will move toward the front of the chair mechanism 200, that is, toward the left as viewed in FIG. 8. Accordingly, the pair of oppositely disposed links 368 will likewise move forwardly or toward the left, as seen in FIG. 8, as well as tending to rotate in the clockwise direction which will simultaneously cause the transversely extending cross-member 358 to move upwardly and forwardly whereby the pair of oppositely disposed seat plates 244 will likewise tend to move upwardly and forwardly. In addition, in view of the fact that the first pair of oppositely disposed L-shaped pivoting links 248 are pivotally connected to the pair of oppositely disposed seat plates 244, as at 252, while upper end portions of the pair of oppositely disposed rearward lift links 254 are pivotally connected to upper terminal end portions of the first pair of oppositely disposed L-shaped pivoting links 248, as at 256, then as the pair of oppositely disposed seat plates 244 move forwardly and upwardly, the first pair of oppositely disposed L-shaped pivoting links 248 will rotate in the counterclockwise direction around the pivotal connections 252 and also move upwardly. Still further, as can also be best appreciated from FIGS. 3, 4, 6, and 7, and remembering that the front-end portion of each one of the fourth pair of oppositely disposed rotating links 236 is also pivotally connected to the pair of oppositely disposed seat plates 244 as at 246, then as the pair of oppositely disposed seat plates 244 move upwardly and forwardly, the fourth pair of oppositely disposed rotating links 236 will pivot in the counterclockwise direction, as view in FIGS. 6 and 7, such that the angle a is increased as defined between the second pair of oppositely disposed rotating links 228 and the fourth pair of oppositely disposed rotating links 236.

[0023] In addition, due to the pivotal connection defined between the intermediate portion of each one of the second pair of oppositely disposed rotating links 228 and the intermediate portion of each one of the fourth pair of oppositely disposed rotating links 236, as at 242, the second pair of oppositely disposed rotating links 228 will be elevated so as to, in turn, not only cause the first pair of oppositely disposed rotating links 224 to rotate in the counterclockwise direction so as to increase the angle B, as defined between the third pair of oppositely disposed rotating links 232 and the first pair of oppositely disposed rotating links 224, but still further, in view of the pivotal connection defined between the third pair of oppositely disposed rotating links 232 and the first pair of oppositely disposed rotating links 224, as at 240, the third pair of oppositely disposed rotating links 232 will be elevated so as to, turn, cause the pair of oppositely disposed front support links 216 to rotate in the counterclockwise direction as a result of the pivotal connection defined between the third pair of oppositely disposed rotating links 232 and the pair of oppositely disposed front support links 216, as at 234, thereby causing the pair of oppositely disposed backrest mounting brackets 212 to move to their reclined positions. In addition, it is also seen that the third pair of oppositely disposed rotating links 232 will effectively move closer to the fourth pair of oppositely disposed rotating links 236 and to the second pair of oppositely disposed rotating links 228, as can best be appreciated from FIG. 7, as will the first pair of oppositely disposed rotating links 224, as the entire pantograph linkage system, comprising a first pantograph linkage arrangement comprising said links 236, 232, 224, 228, and a second pantograph linkage arrangement comprising said links 224, 214, 218, 232, is effectively collapsed or condensed in the forward direction.

[0024] Accordingly, as the pair of oppositely disposed backrest mounting brackets 212 are moved to their reclined positions, it is seen that the third pair of oppositely disposed rotating links 232, the pair of oppositely disposed front support links 216, and the pair of oppositely disposed backrest mounting brackets 212 will move toward the pair of oppositely disposed seat plates 244 so that, contrary to the pair of oppositely disposed backrest mounting brackets 212 conventionally moving away from the pair of oppositely disposed seat plates 224 when the pair of oppositely disposed backrest mounting brackets 212 are moved from their upright positions to their reclined positions, the pair of oppositely disposed backrest mounting brackets 212 will in fact move closer to the pair of oppositely disposed seat plates 244 such that any gap, which would otherwise develop between the powered chair backrest 102 and the powered chair seat 104, when the backrest is reclined relative to the seat, is effectively eliminated whereby the back of the chair occupant can be consistently and properly supported, even when the backrest is reclined relative to the seat, so as to maintain or enhance the comfort of the chair occupant, and wherein further, the disposition and loss of foreign objects, between the powered chair backrest 102 and the powered chair seat 104, is effectively prevented as a result of the elimination of the formation of the gap between the powered chair backrest 102 and the powered chair seat 104. Lastly, it is of course to be realized that when the powered chair backrest 102 is being moved from the reclined position to the upright position, the aforenoted linkage assembly 211 will effectively operate in reverse whereby the powered chair backrest 102 will move farther and farther apart from the powered chair seat 104 such that the powered chair backrest 102 will not impinge upon or compress the powered chair seat 104 during the movement of the powered chair backrest 102 from the reclined position to the upright position.

[0025] Obviously, many variations and modifications of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the present invention may be practiced otherwise than as specifically described herein.

Examples

Embodiment Construction

[0015]Referring now to the drawings, and more specifically to FIG. 3 thereof, it is seen that the powered chair mechanism is disclosed and is generally indicated by the reference character 200. More particularly, it is seen that the powered chair mechanism comprises a backrest assembly 202, a seat assembly 204, a footrest assembly 206, a powered chair framework assembly 208, and a linear actuator assembly 210, all connected together by means of a linkage assembly 211. The backrest assembly 202 is seen to comprise a pair of oppositely disposed backrest mounting brackets 212 upon which the backrest 102 of the powered chair 100 is adapted to be fixedly mounted. Each one of the pair of oppositely disposed backrest mounting brackets 212 has a substantially T-shaped configuration, and it is seen that one of the lower corner regions of each one of the pair of oppositely disposed backrest mounting brackets 212 is pivotally connected to a pair of oppositely disposed rear support links 214, a...

Claims

1. A powered chair, comprising:at least one seat plate upon which a seat of said powered chair is adapted to be affixed;at least one backrest mounting bracket upon which a backrest of said powered chair is adapted to be affixed;a linear actuator; anda linkage assembly operatively connecting said linear actuator, said at least one seat plate, and said at least one backrest mounting bracket such that as said linear actuator moves said at least one seat plate forwardly and upwardly, said linkage assembly will cause said at least one backrest mounting bracket to be moved to a reclined position and to likewise move forwardly whereby a gap between said powered chair backrest and said powered chair seat will be prevented from developing.

2. The powered chair as set forth in claim 1, wherein said linkage assembly comprises:a first link member pivotally connected at a first end to said at least one seat plate;a second link member pivotally connected at a first end to a second end of said first link member; anda third link member pivotally connected at a first end to a second end of said second link member and pivotally connected at a second end to said at least one backrest mounting bracket,wherein, as said first link member is moved forwardly and upwardly as said at least one seat plate is moved forwardly and upwardly, said second link will move forwardly and upwardly, causing said third link member to move upwardly and forwardly, as well as to rotate, so as to cause said at least one backrest mounting bracket to recline and to move forwardly whereby the gap between said powered chair backrest and said powered chair seat will be prevented from developing.

3. The powered chair as set forth in claim 2, further comprising:a fourth link member pivotally connected to said first link member;a fifth link member pivotally connected to said second link member and to said fourth link member;a sixth link member pivotally connected to said fifth link member and to said at least one backrest mounting bracket; anda seventh link member pivotally connected to said sixth link member and to said third link member,wherein said first, second, fourth, and fifth link members form a first pantograph linkage arrangement, and said second, fifth, sixth, and seventh link members form a second pantograph linkage arrangement.

4. The powered chair as set forth in claim 3, wherein:said first and second pantograph linkage arrangements collapse and condense forwardly as said at least one backrest mounting bracket is moved to said reclined position.

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