JP2005095490A - Electric lifting chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric lifting chair allowing a user to tilt a backrest part backward and to take an appropriate posture according to the height of a seat part. <P>SOLUTION: A lifting part 3 of the electric lifting chair with the seat part 1 which can be tilted downward in the rear and the backrest part 2 which can be tilted backward can be lifted up/down. The electric lifting chair has a lifting/rearward tilting mechanism 5. When the seat part 1 is located at a low position near the floor surface, the seat part 1 is made to be located at substantially horizontal state regardless of the angle of tilting of the backrest part 2. When the seat part 1 is at an intermediate position higher than the low position, the seat part 1 is tilted downward in the rear at a smaller angle of rearward tilting than that of the backrest part 2 by the lifting/rearward tilting mechanism. When the seat part 1 is at an upper position higher than the intermediate position, the seat part 1 is tilted downward in the rear at the same angle of rearward tilting as that of the backrest part 2 by the lifting/rearward tilting mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to an electric lift chair.

Conventionally known electric lift chairs have a seat portion and a back portion, and these lift and lower in the height direction by the power of a motor or the like. Furthermore, in addition to the seat part and the back part that only move up and down, the seat part and the back part move up and down and the seat part and the back part integrally incline backward.
Specifically, the lifting chair in which the seat portion and the back portion integrally incline backward will be described. The seat portion and the back portion fixed at a fixed angle are attached to the guide column frame so as to be movable up and down. The guide column frame is pivotally attached to the floor mounting frame so that the guide column frame swings between a substantially vertical state and a rearward inclined state (see, for example, Patent Document 1).

In conventional lifting chairs in which the seat and back are integrally tilted backward, the seat and back are fixed at a fixed angle, so if the back is tilted back to a predetermined angle, the seat is also at that angle. It will tilt backwards. In other words, a person sitting on a chair has a problem that when the back is tilted backward, the knee is lifted greatly, the lower body weight is placed on the waist, and the posture cannot be taken easily.
In addition, when the back part is tilted backward, the seat part also tilts backward, so that there is also a problem that it is difficult for a seated person to stand up from a chair that is tilted backward. Further, there is a problem that the rearward downward tilt angle of the seat portion is constant regardless of the height position of the seat portion and is difficult to use.
JP 11-128014 A

The problem to be solved is that the seat cannot be tilted backwards with the seat in the same posture, and if the back is tilted backward, the seat always tilts backward at the same angle.
In addition, even if the back part is tilted backward, an easy posture cannot be taken, and a person who sits down cannot easily stand up when the back part is tilted backward.

  The present invention relates to an electric lift chair having a seat part that can be tilted rearward and a back part that can be tilted backward, and an elevator part that can be raised and lowered. Regardless of whether the seat is substantially horizontal, and the seat is in a middle position above the low position, the seat is tilted backward and downward at an angle smaller than the back tilt angle of the back, and The seat portion is provided with a lifting / lowering tilting mechanism that tilts the seat portion backward and downward at the same angle as the back tilting angle of the back portion at an upper position further above the middle position.

  The back portion is pivotally attached to a part of a member to which the seat portion is attached, with a horizontal axis passing through a lower end portion of the back portion as a swing center, and at the low position and the middle position of the seat portion. In this case, even when the back portion is inclined backward, the gap between the lower end portion of the back portion and the rear end portion of the seat portion is prevented from being greatly widened.

  The elevating part includes a base member that elevates and lowers along a guide rail having a lower fixed rail member and an upper tiltable tilting rail member, and attaches the seat part and the back part. Has a main base member on the back side and a sub base member on the seat side that is pivotally connected to a lower portion of the main base member, and the up-and-down tilting mechanism includes the main base member and the sub base member. With the both being guided by the tilt rail member, the tilt rail member is tilted to cause the back portion and the seat portion to tilt backward at the same angle, and the main base member is guided by the tilt rail member. In addition, the tilting rail member is tilted in a state where the sub-base member is guided by the fixed rail member, and the back tilt angle of the back portion and the seat portion is made different.

Further, the back part pivotally attached to the lower part of the sub base member so as to be swingable and the main base member are connected at the intermediate part by a link arm to constitute a parallel link mechanism.
Further, the tilt mechanism after raising and lowering includes a tilting actuator that tilts the tilting rail member and a lifting actuator that raises and lowers the base member.
In addition, the tilting mechanism after the lifting / lowering mechanism electrically tilts the tilting rail member when the roller of the sub-base member that moves along the guide rail moves in a transition section between the fixed rail member and the tilting rail member. And tilt control means for deterring automatically.

The electric lift chair of the present invention can change the angle of the seat when the back is tilted backward according to the height of the seat, and an easy-to-use chair is obtained. That is, at a position where the seat portion is low, even if the back portion is tilted backward, the seat portion is not tilted backward much. Thereby, even when the back portion is tilted backward, a person sitting on the seat can easily stand up and perform an easy posture.
Furthermore, in a state where the seat is raised and the back is tilted backward, the seat is tilted rearward and safe so that the person sitting does not slide forward from the seat.

FIG. 1 is a perspective view showing an embodiment of an electric lift chair according to the present invention, and FIG. 2 is a sectional side view thereof. In FIG. 1, the seat body 17 that is the cushion member of the seat portion 1, the back body 19 that is the cushion member of the back portion 2, and the armrest portion 21 are indicated by a two-dot chain line, or a part thereof Omitted.
3, 4, and 5 are cross-sectional side views of the electric lift chair. FIG. 3 shows a state in which the seat portion 1 is in a low position and the back portion 2 is tilted backward, and FIG. FIG. 5 shows a state in which the back part 2 is tilted backward in the middle position, and FIG. 5 shows a state in which the seat part 1 is in the upper position and the back part 2 is tilted backward.

This electric lift chair is such that a lift part 3 having a seat part 1 and a back part 2 can be lifted and lowered, and a floor mounting frame 22 and a pair of left and right guide rails 4 standing from the floor mounting frame 22. , 4, and the elevating part 3 moves up and down along the guide rails 4, 4.
Although a specific configuration will be described later, the seat portion 1 can be tilted backward and the back portion 2 can be tilted backward (reclining). Further, the armrest portions 21 are disposed on both the left and right sides of the upper position of the seat portion 1.

The electric lift chair will be further described with reference to FIGS. 1 and 2. A floor mounting frame 22 installed on the floor is composed of a pair of left and right legs 23 and 23 having a longitudinal direction as a longitudinal direction, and a connecting member for connecting them. 24, and a wheel is attached to the rear end of the leg 23.
On both sides of the floor mounting frame 22, fixed rail members 6 rising in a rearwardly inclined manner are respectively disposed. Further, a support plate 25 is fixed to the lateral outer side of the fixed rail member 6. A lower portion of the tilting rail member 7 that can swing around the first horizontal axis C ₁ is pivotally attached.

The fixed rail member 6 and the tilt rail member 7 can be in the same straight line, and only the tilt rail member 7 can swing backward about the first horizontal axis C ₁ . The guide rail 4 is constituted by the lower fixed rail member 6 and the upper tiltable tilting rail member 7. The upper end portions of the left and right tilt rail members 7 and 7 are connected by a horizontal connecting rod 26, and the connecting rod 26 is used as a handle (grip portion) for moving the chair.

A support member 28 is erected on the intermediate portion in the left-right direction of the connecting member 24 included in the floor-mounting frame 22, and a plate-like mounting piece portion 27 is attached to the rear surface portion of the left and right tilt rail members 7. The left and right mounting pieces 27 are connected at the upper portion thereof by a horizontal first connecting mounting member 29. Then, between the support member 28 and the intermediate portion of the connecting mounting member 29, the tilting actuator 11 to swing to the first horizontal axis C ₁ around the tilting rail member 7 by the electric it is arranged.

As shown in FIG. 2, the tilting actuator 11 includes a guide column 30 having a drive unit (motor) at an end thereof, and a moving unit 31 that moves along the guide column 30. The portion is pivotally attached to the connecting attachment member 29, and the moving unit 31 is pivotally attached to the support member 28.
The guide column 30 has a male screw rod inside along the longitudinal direction, and the moving unit 31 has a female screw member that is screwed into the male screw rod. Changes (moves) along the guide column 30 (see FIG. 3).

  Therefore, by this operation, the tilting rail member 7 can be tilted backward with respect to the floor mounting frame 22. Further, a base member 8 is guided by the guide rail 4 having the tilting rail member 7, and the back portion 2 attached to the base member 8 tilts backward according to the backward tilting operation of the tilting rail member 7.

The elevating part 3 that moves up and down along the guide rail 4 includes a seat part 1, a back part 2, an armrest part 21, and a base member 8 for attaching them. The base member 8 has a main base member 9 on the back portion 2 side (facing the back portion 2 so that the back portion 2 is attached), and a seat portion 1 side pivoted to the lower portion of the main base member 9 (the seat portion 1 is fixed). And a secondary base member 10.
The lower part of the main base member 9 and the upper part of the sub base member 10 are pivotally mounted with the second horizontal axis C ₂ as the axis.

The main base member 9 has side plate members 38 on both the left and right sides, and a connecting horizontal member 37 that connects them. Further, a pair of upper and lower main rollers 32 and 32 and a pair of upper and lower sub-rollers 33 and 33 are attached to the side plate members 38 and 38, respectively. The base member 9 is raised and lowered smoothly, and shaking in the front-rear direction and the left-right direction is prevented.
Further, the sub base member 10 has side plate members 39, 39 on both the left and right sides, and rollers 13, 13 are attached to the lower portions of the side plate members 39, 39, and move in the concave grooves of the guide rail 4. .

The main base member 9 can be moved up and down along the guide rail 4 by an elevating actuator 12, and the elevating actuator 12 is configured as follows.
First, the lower portions of the attachment pieces 27 and 27 attached to the rear surface portions of the left and right tilt rail members 7 and 7 are connected by the second connection attachment member 34.
As shown in FIGS. 1 and 2, the lifting / lowering actuator 12 has a guide column 35 having a drive unit (motor) at an end thereof, and a moving unit 36 that moves along the guide column 35, The lower end portion of the guide column 35 is pivotally attached to the second connecting attachment member 34, and the moving unit 36 is pivotally attached to the connecting horizontal member 37 of the base member 8.

Furthermore, the guide column 35 has a male screw rod along the longitudinal direction inside, and the moving unit 36 has a female screw member that is screwed to the male screw rod, and the male screw rod rotates by the drive unit and moves. The position of the unit 36 changes (moves) along the guide column 35.
Therefore, the main base member 9 can be raised and lowered with respect to the guide rail 4 by the raising and lowering operation of the moving unit 36. Further, the sub-base member 10 pivoted at the lower part of the main base member 9 is brought together so that the sub-base member 10 can be moved up and down at the same time, and the seat portion 1 attached to the main base member 9 and the sub-base member 10. And the back part 2 are moved up and down.

Next, the attachment of the seat portion 1 and the back portion 2 to the base member 8 will be described. The seat portion frame 18 of the seat portion 1 is fixed to the side plate member 39 of the sub base member 10.
In back 2, a mounting arm piece 40 provided on the back frame 20 of the back 2, the upper front portion of the sub-base member 10 (the side plate member 39) is pivotally connected to the third horizontal axis C ₃ around, Further, the back frame 20 of the back portion 2 is attached to the main base member 9 (side plate member 38) via the link arm 16. The attachment of the link arm 16 to the back frame 20 and the main base member 9 can be swung around the fourth horizontal axis C ₄ and the fifth horizontal axis C ₅ , respectively.

That is, the back part 2 and the main base member 9 are pivotally attached to the upper part of the sub-base member 10 at the lower part, respectively, and the back part 2 and the main base member 9 are connected by the link arm 16 at the intermediate part. It is connected. Accordingly, the parallel link mechanism 14 having the four pivotal axes of the second horizontal axis C ₂ , the third horizontal axis C ₃ , the fourth horizontal axis C ₄ and the fifth horizontal axis C ₅ is constituted. It can be said that. Accordingly, the back portion 2 and the main base member 9 having different swing center positions on the sub base member 10 can swing, and stand up or tilt backward while maintaining a parallel state.

Next, the operation of the electric lift chair will be described. The chair raises and lowers the seat 1 and the back 2, and the lift / reverse tilt mechanism 5 that allows the seat 1 to be tilted backward and the back 2 to be tilted backward. Prepare.
Specifically, the post-elevating and tilting mechanism 5 includes a tilting actuator 11 that tilts the tilting rail member 7 and an elevating actuator 12 that raises and lowers the base member 8 along the guide rail 4. Furthermore, a fixed rail member 6 erected on the floor mounting frame 22 and a tilt rail member 7 which is bent with respect to the fixed rail member 6 by the operation of the tilt actuator 11 are provided.

Further, as shown in FIGS. 2 and 3, the up-and-down tilt mechanism 5 makes the seat 1 substantially horizontal regardless of the back-tilt angle of the back 2 when the seat 1 is at a low position near the floor. That is, as shown in FIG. 3, when the seat portion 1 is at a low position, the seat portion 1 is hardly tilted backward and remains horizontal even if the rearward tilt angle of the back portion 2 is an arbitrary angle θ ₁ (seat The downward tilt angle α = 0 to 3 ° of the part 1). In addition, the angle of the back part 2 and the seat part 1 makes the horizontal line the reference line.
As shown in FIG. 2, the low position is a position where the seat portion 1 is lowered to the lowest position, the sub base member 10 (the roller 13 thereof) is guided to the lower position of the fixed rail member 6, and The base member 9 (the main rollers 32 and 32 and the sub rollers 33 and 33) are guided by the tilting rail member 7.

In this state, when the tilting actuator 11 is operated, the tilting rail member 7 tilts backward with the first horizontal axis C ₁ as the axis as shown in the cross-sectional side view of the main part in FIGS. To do. As a result, the sub base member 10 guided by the fixed rail member 6 is in a substantially unchanged state (posture), and the main base member 9 guided by the tilting rail member 7 is tilted rearward and linked to the main base member 9. The back 2 attached via the arm 16 tilts backward. And the back inclination angle of the back part 2 and the seat part 1 will differ.

That is, in this state, the first horizontal axis C ₁ that is the swing center of the tilting rail member 7 and the second horizontal axis C ₂ that is the pivot point between the main base member 9 and the sub base member 10 are provided. In the side view, it exists on the substantially same straight line (at a close position), so that the tilting of the tilting rail member 7 does not affect the operation of the sub base member 10 via the main base member 9, and the sub base The member 10 is left as it is, and the main base member 9 is tilted.

Further, the lifting / lowering tilt mechanism 5 tilts the seat part 1 backward and downward at an angle smaller than the rear tilt angle of the back part 2 when the seat part 1 is in the middle position above the low position (state of FIG. 4). That is, as shown in FIG. 4, when the seat portion 1 is in the middle position, if the rearward tilt angle of the back portion 2 is an arbitrary angle θ ₂ (= θ ₁ ), the seat portion 1 has an angle β smaller than the angle θ _2. And tilt backwards.
The intermediate position is a position where the seat portion 1 is above the lowest position, but the sub-base member 10 (the roller 13) is guided to an intermediate height position or an upper position of the fixed rail member 6, and The main base member 9 (the main rollers 32 and 32 and the sub rollers 33 and 33) are guided by the tilting rail member 7. Further, the maximum rearward downward inclination angle β of the seat portion 1 is about 5 to 10 °.

Then, in the state of the middle position is the seat 1, when actuating the tilt actuator 11, as shown in fragmentary cross-sectional side view of FIG. 7, the tilting rail member 7 as axis the first horizontal axis C ₁ Tilt backwards. Thereby, the main base member 9 guided by the tilting rail member 7 is tilted, and the back portion 2 attached to the main base member 9 via the link arm 16 is tilted backward.

More specifically, as the main base member 9 is tilted, the sub base member 10 pivotally connected to the main base member 9 with the second horizontal axis C ₂ as a pivot point remains guided by the fixed rail member 6. It tilts backward with the sixth horizontal axis C ₆ , which is the axis of the roller 13, as the pivot center, and is moved backward by the back part 2, with the back part 2 and the third horizontal axis C ₃ as pivot points. The pivoted sub-base member 10 swings backward with the sixth horizontal axis C ₆ as the swing center.

That is, the sub base member 10 swings around an axis (sixth horizontal axis C ₆ ) different from the swing axis (first horizontal axis C ₁ ) of the tilting rail member 7. The sub-base member 10 tilts backward at an angle smaller than that of the tilting rail member 7 because the sub-base member 10 swings at a swing radius larger than the swing radius when the first horizontal axis C ₁ is the center. The back tilt angle between the back portion 2 and the seat portion 1 will be different.

Further, the up-and-down tilt mechanism 5 tilts the seat 1 backward and downward at the same angle as the back tilt angle of the back portion 2 when the seat 1 is in an upper position (a state shown in FIG. 5) further above the middle position. It is configured. That is, as shown in FIG. 5, when the seat portion 1 is in the upper position, if the rearward tilt angle of the back portion is an arbitrary angle θ ₃ (= θ ₂ ), the seat portion 1 is also rearward at the same angle γ as the angle θ _3. Tilt down.
The upper position means a state in which both the main base member 9 (the main rollers 32 and 32 and the sub rollers 33 and 33) and the sub base member 10 (the rollers 13) are guided by the tilting rail member 7 ( (State of FIG. 5).

In this state, when operating the tilt actuator 11, as shown in fragmentary cross-sectional side view of FIG. 8, the tilting rail member 7 is tilted rearward to the first horizontal axis C ₁ as the axis. Thereby, the main base member 9 and the sub base member 10 guided by the tilting rail member 7 are inclined at the same angle, and the seat portion 1 and the back portion 2 attached to the main base member 9 and the sub base member 10 are provided. Tilt backwards at the same angle.

  Further, although not shown in the drawings, the up-and-down tilt mechanism 5 can raise the seat 1 to a high position that is a position further above the above-described upper position. In addition, from the upper position to the high position, for safety, the seat portion 1 and the back portion 2 may be controlled not to tilt backward (electrically).

In the electric lift chair of the present invention, the seat portion 1 has the back portion 2 centered on the horizontal axis a (third horizontal axis C ₃ ) passing through the lower end portion 2a of the back portion 2 (back portion main body 19). Is pivotally attached to a part (front upper part) of a member (sub-base member 10) to which is attached.
Specifically, the attachment portion of the attachment arm piece 40 is extended from the lower portion of the back frame 20 to the lower end portion of the back portion main body 19, and is pivotally connected to the auxiliary base member 10 and the horizontal axis a around the attachment portion. .
Therefore, in the low position (FIG. 6) and the middle position (FIG. 7) of the seat part 1, even if the back part 2 tilts backward, the distance (gap E) between the lower end part 2a of the back part 2 and the rear end part 1a of the seat part 1 ) Is prevented from spreading greatly.

Further, in the tilting mechanism 5 of the electric lift chair according to the present invention, the roller 13 of the sub base member 10 that moves along the guide rail 4 moves in the transition section between the fixed rail member 6 and the tilt rail member 7. Further, tilt control means 15 for electrically suppressing tilting of the tilting rail member 7 is provided.
The transition section between the fixed rail member 6 and the tilt rail member 7 is a predetermined distance along the tilt rail member 7 from the gap between the upper end surface of the fixed rail member 6 and the lower end surface of the tilt rail member 7. The upper margin part to the position taken upward by the dimension and the lower margin part from the gap part to the position taken downward by the predetermined dimension along the fixed rail member 6 are included.

That is, since the tilting rail member 7 is bent with respect to the fixed rail member 6 by the tilting of the tilting rail member 7, a large gap is formed, so that the roller 13 is interposed between the fixed rail member 6 and the tilting rail member 7 and its If it exists in the vicinity, the roller 13 will be removed. Therefore, in the present invention, when the roller 13 exists in the section, the tilting rail member 7 is controlled not to tilt.
Further, the tilting control means 15 raises the tilting rail member 7 linearly with the fixed rail member 6 when the elevating part 3 descends (rises) while reaching the section while the tilting rail member 7 is tilted backward. If it is not in a state, you may comprise so that the raising / lowering part 3 cannot be lowered | hung down (raised) any more.

The specific configuration of the tilt control means 15 will be described. The tilt control means 15 is attached to the main base member 9 with a switch (limit switch) 41 fixed to the mounting piece 27 of the tilt rail member 7 and at a predetermined vertical distance. The upper contact member 42 and the lower contact member 43 that are in contact with the switch 41 and a control circuit unit (not shown) for controlling the operation of the tilting actuator 11 are provided.
The control circuit unit enables the tilting actuator 11 to operate when the switch 41 is in contact with the upper contact member 42 or the lower contact member 43 (the switch 41 is operated), and does not operate when the switch 41 is not in contact. It is electrically controlled to make it possible. That is, the predetermined vertical interval corresponds to a section in which the roller 13 is moving in the transition section.

Further, the upper and lower limit stop control of the lifting actuator 12 may be provided with a contact and an upper limit and lower limit position detector (limit switch) between the lifting unit 3 and the guide rail 4. Alternatively, the position detector included in the actuator 12 may be used.
Further, the maximum backward tilting and standing stop control of the tilting actuator 11 is performed, for example, by the contact between the floor mounting frame 22 (support plate 25) and the tilting rail member 7, and the maximum backward tilting and standing positions. Although a detector (limit switch) may be provided, it may be performed by a position detector included in the tilting actuator 11 itself.

  Further, as shown in FIGS. 1 and 2, a swing frame 44 is pivotally attached to the lower surface portion of the seat frame 18, and when the elevating unit 3 is lowered or when the seat unit 1 is tilted backward and downward. When returning to the horizontal state, if there is an object or a leg of a person sitting under the seat 1, the swing frame 44 comes into contact with the object or the foot, and the swing frame 44 swings upward. By actuating the limit switch 45 provided on the part frame 18, the operations of the lifting actuator 12 and the tilting actuator 11 can be urgently stopped.

  As described above, according to the present invention, in the electric lift chair that can move up and down with the lift section 3 having the seat section 1 that can tilt backward and the back section 2 that can tilt backward, the seat section 1 is close to the floor surface. The seat portion 1 is substantially horizontal regardless of the back tilt angle of the back portion 2 at the low position, and the seat portion 1 is seated at an angle smaller than the back tilt angle of the back portion 2 at the middle position above the low position. An elevating / lowering tilt mechanism 5 that tilts the rear part 1 backward and tilts the seat part 1 backward and backward at the same angle as the rearward tilt angle of the back part 2 when the seat part 1 is further upward than the middle position is provided. Therefore, according to the height of the seat part 1, the back downward inclination angle of the seat part 1 when the back part 2 is tilted backward can be changed, and an electric lift chair that is easy to use can be obtained.

In other words, even if the back portion 2 is largely tilted backward at the position where the seat portion 1 is low, the seat portion 1 is not largely tilted rearward and downward. Thereby, even when the back portion 2 is tilted backward, a person sitting on the seat portion 1 can easily stand up and perform a comfortable posture.
Further, in a state where the seat portion 1 is raised and the back portion 2 is tilted backward, the seat portion 1 is tilted rearward and safe so that a person sitting does not slide forward from the seat portion 1.

  The back portion 2 is pivotally attached to a part of a member to which the seat portion 1 is attached, with the horizontal axis a passing through the lower end portion 2a of the back portion 2 as a swing center, and the lower position and the middle portion of the seat portion 1 are attached. In this position, even if the back portion 2 is tilted backward, the gap between the lower end portion 2a of the back portion 2 and the rear end portion 1a of the seat portion 1 is prevented from widening greatly. You can recline in a natural posture without placing a burden on the waist of the person sitting.

  The elevating unit 3 includes a base member 8 that moves up and down along a guide rail 4 having a lower fixed rail member 6 and an upper tiltable tilting rail member 7 and attaches the seat portion 1 and the back portion 2. The base member 8 has a main base member 9 on the back portion 2 side and a sub-base member 10 on the seat portion 1 side that is pivotally connected to a lower portion of the main base member 9. And the sub base member 10 are guided by the tilt rail member 7, the tilt rail member 7 is tilted to tilt the back portion 2 and the seat portion 1 backward at the same angle, and the main base member 9 tilts. Since the tilting rail member 7 is tilted while being guided by the rail member 7 and the sub-base member 10 is guided by the fixed rail member 6, the back tilt angle of the back portion 2 and the seat portion 1 is made different. Depending on the height of the seat part 1, tilt the back part 2 backward Seat 1 can be changed to the rear lower inclination angle when, using easy electric lift chair is obtained.

Further, since the back part 2 and the main base member 9 pivotably attached to the lower part of the upper part of the sub-base member 10 are connected to each other at the link arm 16 to form a parallel link mechanism 14. Even if the back portion 2 and the main base member 9 in the sub-base member 10 have different swing center positions, the back portion 2 can be smoothly tilted backward.
Further, the load acting on the back portion 2 can be appropriately transmitted to the main base member 9 and the guide rail 4 via the link arm 16, which is safe.

  Moreover, since the raising / lowering tilting mechanism 5 includes the tilting actuator 11 for tilting the tilting rail member 7 and the lifting / lowering actuator 12 for raising / lowering the base member 8, the back part 2 can be moved at an arbitrary height. Can be tilted backwards.

  Further, the tilting mechanism 5 after raising and lowering tilts the tilting rail member 7 when the roller 13 of the sub base member 10 moving along the guide rail 4 moves in the transition section between the fixed rail member 6 and the tilting rail member 7. Since the tilt control means 15 for electrically deterring is provided, the sub base member 10 never falls off the guide rail 4 and can be a safe electric lift chair.

It is a perspective view which shows one Embodiment of the electric lifting chair of this invention. It is a cross-sectional side view of an electric lifting chair. It is a section side view showing the state where the seat part was in the low position and the back part was tilted backward. It is a section side view showing the state where the seat part was in the middle position and the back part was tilted backward. It is a cross-sectional side view which shows the state which the seat part exists in the upper position and made the back part incline backward. It is a side view which shows the principal part of FIG. It is a side view which shows the principal part of FIG. It is a side view which shows the principal part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat part 1a Rear end part 2 Back part 2a Lower end part 3 Lifting part 4 Guide rail 5 Lifting / lowering tilting mechanism 6 Fixed rail member 7 Tilt rail member 8 Base member 9 Main base member
10 Secondary base material
11 Actuator for tilting
12 Lifting actuator
13 Laura
14 Parallel link mechanism
15 Tilt control means
16 Link arm

Claims (6)

  In an electric lift chair that can be lifted and lowered by a lift (3) having a seat (1) that can be tilted backward and a back (2) that can be tilted backward, the seat (1) is low near the floor. Regardless of the back tilt angle of the back portion (2), the seat portion (1) is substantially horizontal, and the seat portion (1) is in the middle position above the low position. The seat portion (1) is tilted backward and downward at an angle smaller than the rear tilt angle, and the back portion (2) is tilted backward when the seat portion (1) is in an upper position further above the middle position. An electric lifting chair comprising a lifting / lowering tilting mechanism (5) for tilting the seat (1) backward and downward at the same angle.   The back portion (2) is pivotally attached to a part of a member to which the seat portion (1) is attached, with a horizontal axis (a) passing through a lower end portion (2a) of the back portion (2) as a swing center. The lower end (2a) of the back portion (2) and the rear end of the seat portion (1) even when the back portion (2) tilts backward at the low position and the middle position of the seat portion (1). The electric lifting chair according to claim 1, wherein the distance from the portion (1 a) is prevented from widening.   The elevating part (3) elevates and lowers along a guide rail (4) having a lower fixed rail member (6) and an upper tiltable tilting rail member (7), and the seat (1) and the above A base member (8) for attaching the back portion (2) is provided, and the base member (8) is pivotally connected to a main base member (9) on the back portion (2) side and a lower portion of the main base member (9). The sub-base member (10) on the side of the seat (1), and the tilting mechanism (5) is a tilting mechanism for both the main base member (9) and the sub-base member (10). The tilting rail member (7) is tilted while being guided by the rail member (7) to tilt the back portion (2) and the seat portion (1) backward at the same angle, and the main base member (9) is guided by the tilting rail member (7) and the sub-base member (10) is guided to the fixed rail member (6). 3. The electric lift according to claim 1 or 2, wherein the tilting rail member (7) is tilted in a closed state so that the back tilt angle of the back portion (2) and the seat portion (1) is different. Chair.   The back portion (2) and the main base member (9) pivotably attached to the lower portion of the upper portion of the sub-base member (10) are connected to each other by a link arm (16), The electric lift chair according to claim 3, constituting a parallel link mechanism (14).   The raising / lowering tilting mechanism (5) includes a tilting actuator (11) for tilting the tilting rail member (7), and a lifting actuator (12) for lifting and lowering the base member (8). The electric lifting chair according to 3 or 4.   The raising / lowering tilt mechanism (5) includes a roller (13) of the sub-base member (10) that moves along the guide rail (4), and the fixed rail member (6), the tilt rail member (7), and the like. The electric lift chair according to claim 3, 4 or 5, further comprising a tilt control means (15) for electrically suppressing tilting of the tilting rail member (7) when moving in the transition section.

Images