JP2005205127A - Seat height adjusting type chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair which enables an advanced age person or a physically handicapped person to raise or lower the height of the seat section by a switch operation alone at hand, and which can assist his or her standing up or sitting down, and also, can be utilized as a rotary low chair when being lowered to the lowest position. <P>SOLUTION: This chair is constituted in such a manner that four units of an X-axial link mechanism which opens/closes are installed in parallel in the lateral direction, and a central power transmitting shaft L and a central power transmitting shaft K which are power shafts at the center are rotated by a spur gear Y and a spur gear Z by a motor 50 while being interlocked. Thus, with the rotating power of the power shafts as the origin, a movable body S and a movable body R located on the upper and lower diagonal lines are relative-angularly cross-move. Two units of the link mechanism on the right and left external sides rise to the front side, and two units of the link mechanism on the right and left internal sides rise to the rear side in proportion with the movement. Thus, the seat section located on the upper side can vertically be moved under a horizontal state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates mainly to an electric lift chair, and more particularly to a seat height adjustment structure for a chair that can adjust the height of the seat according to the purpose of use such as a chair or a chair.

Conventionally, various seat structures such as chairs and chairs have been proposed, but there are many things in which the height of the seat cannot be adjusted. Examples of structures that can adjust the height of the seat include a gas spring type structure and a structure in which the seat chair itself is lifted or lowered by an elevator at the back of the backrest.

  There are individual differences in the body shape of individual users, and it is necessary to adjust the height of the seat according to individual differences such as the height of each user, especially the length of the feet, in order to obtain a comfortable feeling of use. There is. Also, with regard to sitting chairs, etc., it is difficult for the elderly to sit down on the sitting chair and bend to the end and sit on the sitting section. If you lower the height of the seat afterwards, it will be very easy to sit down. Also, when standing up, it is very easy to stand up if the seat is automatically lifted with a power source such as a motor to a height where it can easily stand up with one switch operation at hand. As for the assisting action for standing up and sitting for these elderly people and the handicapped person, it is impossible for the chair of the gas spring type structure, and the seat chair itself is made by the elevator at the back of the backrest. For things that are raised and lowered, the mechanism of the chair itself is complicated and large, so the load is too heavy.

Means to solve the problem

  In order to solve the above problems, the present invention is an apparatus made in view of various problems. The movable power transmission shaft 14 and the movable power transmission shaft are arranged at appropriate intervals in parallel so that a total of four X-axis link mechanisms sit on the seat portion and rise up at the outer rear portion and the inner front portion at the lower portion of the seat portion of the chair. 15 has an integrated connection structure, and the upper part of each X-axis link mechanism is a seat, and the height of the seat height can be freely adjusted by opening and closing the X-axis link. It was a chair. In addition, the seat height can be easily controlled by using a power source such as a motor.

The invention's effect

  With regard to normal chairs and sitting chairs by the above means, it is easy to adjust the height of the seat according to the individual user's body shape, etc. Even if a free person sits on the seat, it is easy to sit on the seat without bending down to the end, and it can be lowered to the height of a seat, etc. It is possible to stand up easily by raising the seat from the state where it is easy to stand up after raising the seat part to the upper part in the hand operation part. In addition, by installing four link mechanisms in parallel at an appropriate interval, the up-and-down range is increased and stability is further increased compared to the conventional X-axis link mechanism in which only two units are arranged in parallel. And increased load strength.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, an embodiment of the present invention will be described with reference mainly to (FIGS. 1 and 2). The lift chair of the present invention is formed by mounting a seat portion 3 on a seat portion setting base 2. As shown in FIG. 1 and FIG. 2, there are a total of four E link mechanisms on the outer side in the AB direction, and two F link mechanisms on the inner side. An X-shaped link mechanism is formed in parallel in the AB direction. For example, each of the four links E and F is divided into a first link 6 and a second link 7 as in the E link mechanism shown in FIG. 5, and the first link 6 is further divided into a link 6 and a link 6 ′. In addition, the second link is separated like a link 7 and a link 7 'and faces each other.

  The first link 6 and the second link 7 are arranged so as to intersect with each other in the X-axis shape, and the center of the first link 6 and the center of the second link 7 are connected to each other by a connecting rotary shaft 8 along CD. It is connected so that it can rotate in any direction. An upper connection hole 6A and a lower connection hole 6B, which are holes for passing connection pins, are opened at the upper and lower ends of the first link 6, and holes for passing connection pins through the upper and lower ends of the second link 7 as well. The upper connecting hole 7A and the lower connecting hole 7B are open. The upper connection holes 6A and 7A at the upper ends of the links are formed in the connection holes 5A opened in the upper link connection base 5 located above the first link 6 and the second link 7 intersecting in the X-axis shape. The upper connecting hole 6A is pin-bonded so as to be rotatable in the CD direction, and the upper connecting hole 7A is pin-connected to the upper movable connecting hole 5B so as to be horizontally movable in the CD direction between the upper movable connecting holes 5B. ing.

  Further, the lower connection hole 6B and the lower connection hole 7B at the lower end are connected to the lower link connection base 4 located below the first link 6 and the second link 7 intersecting in the X-axis shape. The lower connecting hole 7B is pin-joined so as to be rotatable in the CD direction, and the lower connecting hole 6B is pin-joined so as to be horizontally movable in the CD direction at the lower movable connecting hole 4B. Only the connecting pin that connects the movable connecting hole 4B and the connecting hole 6B is changed to a movable power transmission shaft 14, so that the lower movable connecting hole 4B is pin-bonded so as to be horizontally movable in the B-C direction. become. As a result, when the movable power transmission shaft 14 moves horizontally from the C side to the D side between the C and D through the movable connection hole 4B opened in the lower link connection base 4, the second link 6 connects the pin joint 5A. It rises toward the D side at the base point and pushes up the upper link coupling base 5.

  At this time, the second link 7 is also suspended so that the centers of the first link 6 and the second link 7 are rotatably connected by the connecting rotary shaft 8, so that the upper link connecting base 5 is based on the pin joint 4 </ b> A. The movable link hole 5B, which is open to the center, is moved from the C side to the D side between C and D, and the upper link connection base 5 is pushed up in a horizontal state.

In addition, the pits for accommodating the connecting rotary shaft 8 when the X-axis link is completely closed are the pits 5C on the lower side of the center part of the upper link installation table 5 and the pits 4C on the upper side of the center part of the lower link installation table 4. This is for wrapping the connecting rotary shaft 8 when the link is closed.
This is the structure of the two E link mechanisms arranged on the left and right outer sides in the AB direction.

  Next, two symmetrical F link mechanisms arranged inside the E link mechanism will be described. The four link mechanisms have been described above by taking the E link mechanism located outside the AB direction as an example, but the F link mechanism located inside the E link mechanism is also the first link 11 like the E link mechanism. The first link 11 is divided into a link 11 and a link 11 ′, and the second link 12 is divided into a link 12 and a link 12 ′ so as to face each other. The first link 11 and the second link 12 are arranged so as to intersect and face each other in the X-axis shape, and the center of the first link 11 and the center of the second link 12 are connected by a connecting rotary shaft 13. It is connected so as to be rotatable in the CD direction.

  An upper connection hole 11A and a lower connection hole 11B, which are holes for passing connection pins, are opened at the upper and lower ends of the first link 11, and holes for passing connection pins through the upper and lower ends of the second link 12 as well. The upper connecting hole 12A and the lower connecting hole 12B are open. The upper connection holes 11A and 12A at the upper ends of the links are formed in the connection holes 10A opened in the upper link connection base 10 located above the first link 11 and the second link 12 intersecting in the X-axis shape. The upper connection hole 12A is rotatably pin-connected, and the upper connection hole 11A is pin-connected to the upper movable connection hole 10B so as to be horizontally movable in the CD direction between the upper movable connection holes 10B.

  Further, the lower connecting hole 11B and the lower connecting hole 12B at the lower end are a connecting hole 9A opened in the lower link connecting base 9 positioned below the first link 11 and the second link 12 intersecting in the X-axis shape. The lower connecting hole 11B is rotatably pin-connected, and the lower connecting hole 12B is pin-connected to the lower movable connecting hole 9B so as to be horizontally movable in the CD direction between the lower movable connecting holes 9B. At this time, the connecting pin that connects the lower movable connecting hole 9B and the connecting hole 12B becomes the movable power transmission shaft 15 and changes.

  Accordingly, when the movable power transmission shaft 15 moves horizontally from the D side between C and D toward the C side through the movable connection hole 9B opened in the lower link connection base 9, the second link 12 connects the pin joint 10A. It rises toward the C side at the base point and pushes up the upper link coupling base 10.

  At this time, the first link 11 is also suspended so that the centers of the first link 11 and the second link 12 are rotatably connected by the connecting rotary shaft 13, so that the upper link connecting base 10 is based on the pin joint 9 </ b> A. The rotary pin moves from the D side toward the C side through the movable connection hole 10B opened to the upper side, and the upper link connection base 10 is pushed up by the first link 11 and the second link 12 in the horizontal state. It becomes like this.

  Up to this point, there is no mechanical difference between the E link mechanism and the F link mechanism. However, the E link mechanism has an X-axis link on the movable power transmission shaft 14 in the direction of C-D from the C side to the D side. However, for the F-link mechanism, the CD direction is raised from the opposite D side to the C side.

  Moreover, in order to transmit the motive power transmitted from the motor 50 currently fixed to the upper part of the link installation stand 1 of the center part between AB of (FIG. 1), the F link mechanism inside an E link mechanism is ( 2) through the central power transmission shaft K in FIG. 2) to the movable power transmission shaft 14 on the C side in the CD direction, and to the E link mechanism on the outside through the inner lower link coupling base 9. Therefore, the link connecting base 9 of the F link mechanism on the inner side is one step higher than the link mounting base 4 of the E link mechanism on the outer side, and the subsequent stage is connected to the movable hole 4B of the link mounting base 4. As is the case, the movable power transmission shaft 14 has a hole for horizontal movement.

  For this purpose (FIGS. 1 and 2), the movable power transmission shaft 15 for transmitting the power from the motor 50 to the F link mechanism via the central power transmission shaft K from the motor 50 to the F link mechanism, which is the link mechanism inside AB. A movable hole 9 </ b> C for horizontally moving is opened on the upper side of the link installation base 9 (FIG. 6). As a result, the links 11 and 12 of the F link mechanism are slightly shorter than the links 6 and 7 of the E link mechanism.

  It should be noted that when the X-axis link is completely closed, the bit that accommodates the connecting rotary shaft 13 is located at the lower center portion 10C of the upper link mounting base 10 and the upper upper center portion of the lower link mounting base 9 (FIG. 6). The connecting rotary shaft 13 is wrapped around 9C. This is the structure of the two F link mechanisms arranged on the left and right inner sides in the AB direction.

  Next (FIGS. 1 and 2), the center part of the link installation base 1 will be described. When the motor 50 which is a power source rotates, power is transmitted to the central power transmission shaft K and rotates. The central power transmission shaft K is screwed into a rotating spiral shape, and the central portion of the spur gear Y is fitted in the vicinity of the motor 50 so as to be integrally fixed to the central power transmission shaft K. A journal bearing is provided so as to face the motor 50 and the direction CD, and the central power transmission shaft K extends there.

  Similarly to the horizontal upper part of the motor 50, the spur gear Y, the central power transmission shaft K, and the journal bearing, there are a journal bearing c, a spur gear Z, a central power transmission shaft L, and a journal bearing a from the upper side of the motor 50. The spur gear Y and the spur gear Z mesh with the same size and number of teeth. Further, the central power transmission shaft K has a moving body R at a position where it intersects the movable power transmission shaft 14, and a hole is opened in the moving body R so that the central power transmission shaft K penetrates. The movable power transmission shaft 14 is threaded so as to engage with the central power transmission shaft K and intersects with the movable power transmission shaft 14 so as to be integrated.

  Similarly, the central movable power transmission shaft L in the horizontal upper part has a moving body S at a location intersecting with the movable power transmission shaft L, and a hole is opened in the movable body R so that the central power transmission shaft L penetrates. Further, the inside of the hole is threaded so as to be engaged with the threading of the central power transmission shaft L, and has an integral structure with the movable power transmission shaft 15 that intersects.

  With these structures, when the motor 50 rotates, the central power transmission shaft K also rotates, and the spur gear Y attached to the central power transmission shaft K also rotates. Since the spur gear Y meshes with the spur gear Z, the spur gear Z also rotates at the same rotational speed. Since the central power transmission shaft L is also integrally connected and fixed so as to penetrate the central portion of the spur gear Z, the central power transmission shaft L also rotates. The two central power transmission shafts K and the central power transmission shaft L are fitted so that the movable body R and the movable body S are engaged with the threads of the central power transmission shaft K and the central power transmission shaft L so as to be a diagonal line. Therefore, the moving body S and the moving body R move in the vertical crossing direction on the shafts by the rotation of the central power transmission shaft K and the central power transmission shaft L.

    Since the movable power transmission shaft 15 and the movable power transmission shaft 14 are attached to the movable body S and the movable body R so as to be orthogonal to each other, the movable power transmission shaft 14 transmits power to the outer E-link mechanism. Since the movable power transmission shaft 15 transmits power to the inner F link mechanism, the links of the E link mechanism and the F link mechanism perform vertical opening / closing movements. Therefore, the seat can be lifted or lowered while the seat installed on the uppermost surface remains horizontal.

  Further, a rotary bush 18 and a rotary shaft 19 are attached to the lower center of the link installation base 1 and the upper center of the floor installation board 20 in FIG. It can be rotated.

  Because these chairs have a lifting function and a rotating function, if you operate a switch attached at an arbitrary position, the seat will be lifted to the desired height within the range where each X-shaped link can be opened and closed. I can do it. In addition, it is a chair that can be used as a sitting chair when the height is lowered to the lowest place. Since the seat is lifted by these four link mechanisms, the link mechanism is usually only arranged at the left and right. It is a chair with increased stability that is raised higher than the one and can withstand higher loads.

  As a method of sending electric power to the motor 50 which is a power source, an outlet type may be used, or a battery or the like may be mounted so that it can be used even in a place without a power source such as an outlet. In addition, if it is manually opened and closed, etc., it is difficult for people with disabilities and older people to use it, but if it is changed in such a way, it can be used easily in any place where there is no power source such as an outlet. Also good.

"Other embodiments"
As shown in FIG. 8, the motor is also attached to the upper portion of the motor 50 to remove the spur gear Z, spur gear Y, and the link connecting rotary shafts 8 and 13, and the movable power in each hole opened on the C side below each link. The movable body S and the movable body R, which are connected and fixed to the movable power transmission shafts by passing through the transmission shaft 14 and the movable power transmission shaft 15 through the holes opened on the D side, are provided with two motors. Each of them moves on the central power transmission shaft separately, and the seat installation base 2 and the seat 3 attached to the upper surface of each link mechanism incline the CD direction toward the C side. This mechanism can also be applied to chairs that can be tilted toward the D side. At this time, the C-side and D-side holes opened in the upper link connection base are simply holes for connecting the links so that they can rotate, and the lower link connection holes are all in two vertical stages and are movable. The movable holes are opened so that the power connecting shaft 14 and the movable power connecting shaft 15 move horizontally in the same manner in the CD direction.

  It can also be applied to a bed or some kind of bed with a lifting function or a front / rear / right / left tilt function using these link mechanisms.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole structural view of the chair seen from the front diagonal which shows one Embodiment of this invention. FIG. 2 is a structural diagram of only the link mechanism portion of the present invention as seen from the front oblique direction showing one embodiment. It is the structure figure seen from the side which shows one embodiment of this device. It is the structure figure seen from the front which shows one embodiment of this device. It is an E link mechanism figure showing one embodiment of this device. It is F link mechanism figure which shows one Embodiment of this device. It is a shape figure of moving body S * R from the front view which shows one Embodiment of this device. (The inside of the F link mechanism is stronger.) It is a side view of a chair that can be tilted back and forth using a link mechanism of the present invention.

Explanation of symbols

1, link installation base 2, seat installation base 3, seat and seat cushions 4 and 14, lower link connection bases 5 and 10, upper link connection bases 6, 7, 11, 12 and links 4A, 5A, 9A, 10A, upper and lower connecting holes 4B, 5B, 9B, 10B, upper and lower movable holes 4C, 5C, 9C, 10C, upper and lower pits 8 and 13 in which the connecting rotary shafts are accommodated, connecting rotary shaft 50, motor a C, journal bearings L / K, vertical center power transmission shafts Z / Y, vertical spur gears S / R, vertical moving bodies 14/15, movable power transmission shafts 18/19, rotary bushing and rotary shaft 20, floor Surface installation panel E link mechanism, part F link mechanism surrounded by dotted line below E, part surrounded by dotted line below F

Claims (3)

  A central power transmission shaft K extending from the motor 50 and a central power transmission shaft L threaded in the same shape on the parallel upper part thereof are rotatably mounted by journal bearings a The two central power transmission shafts are interlocked and rotated by the spur gear Y and the spur gear Z, and the movable body S and the movable body R cross and move diagonally on each central power transmission shaft. Power is transmitted to a total of four link mechanisms F and E installed in parallel in the AB direction by a movable power transmission shaft 14 and a movable power transmission shaft 15 that are connected and fixed to the S in the AB direction. An elevating mechanism in which the link mechanism opens and closes in the vertical direction, and the upper surface of each link mechanism is raised or lowered horizontally.   An elevating seat chair that can be raised and lowered in a horizontal state by providing a seat portion 3 on the upper surface of each link mechanism using the four link mechanisms of claim 1.   The motor 50 is also attached to the upper portion C of the motor 50 as shown in FIG. 8, and the spur gear Z and spur gear Y of FIG. The movable power transmission shaft 14 and the movable power transmission shaft 15 extending from the movable body S and the movable body R moving on the L are provided in the respective holes opened on the C side in the CD direction below the respective links. 14, the movable power transmission shaft 15 is passed through each part of each hole opened on the D side and is pin-bonded, and each moving body S and moving body R are moved separately, so that the seat installation base 2 and the seat 3 are C A chair that can be tilted to the C side in the D direction or tilted to the D side.

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