JPH071005Y2 - Balance lift chair - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a balance lift chair that assists people who have difficulty standing or sitting on their own.

[0002]

2. Description of the Related Art Conventionally, in an elevator chair for a disabled person, a seat portion on which a person sits can be freely moved from a low sitting posture to a high sitting posture without using mechanical means such as ratchets and gears. Interlockingly connected to a telescopic cylinder,
The cylinder was designed to have a push-up force that pushes up the seat portion just above with a force that is almost in proportion to the weight of the sitting person by opening the valve.

[0003]

[Problems to be Solved by the Invention] In the above-described balanced lift chair, as the balance error between the weight of the seated person and the pushing force for pushing the seat directly above increases, the lift of the seat chair increases. If the pushing force that pushes the seat directly above is lower than the weight of the seated person due to the increased resistance to operation and the balance error, the seat chair will suddenly descend. Therefore, for reasons such as increased risk, the weight of the seated person and the pushing force that pushes the seat directly above should always be accurately balanced regardless of the height of the seat. However, it is an essential requirement to enable the balance lift chair to be operated lightly and safely by a small amount of human power, but when considering a conventional balance lift chair using a cylinder, First, using compression force Since it is not possible to create a constant push-up force with, the cylinder's characteristic compression force is used to measure the weight of the seated person and the push-up force that pushes the seat up right above the seat height position. However, it is not always possible to perform accurate balancing, and it has therefore been impossible to operate the vehicle lightly and safely with a small amount of human power. Secondly, in the conventional balanced lift chair using a cylinder, since the cylinder itself has a characteristic that its total length becomes longer when the cylinder spindle extends, the output mechanism section becomes larger. It was extremely difficult to design a compact and practical one by incorporating it into the limited space of a chair. Thirdly, in the case of the conventional balanced lift chair using a cylinder, the pressure inside the cylinder is preset so as to balance with the weight of a specific person, so it can only be used by a specific person. However, the versatility was low, and the field of use was limited to a narrow range. The present invention has been made to solve the above problems.

[0004]

Now, this will be sequentially described with reference to the drawings. First, the principle of producing a constant force will be described with reference to FIG. There is a rod that rotates with its origin O as a fulcrum, and a wire is attached from an arbitrary point A on the Y axis to an arbitrary point B on the rod so that the rod is always pulled by a vector BA. If the vector BA is decomposed into two forces, a force vector BC parallel to the Y-axis that pushes up the point B and a force vector BO acting on the point B toward the origin O, a parallelogram ACBO is formed. The length of the four sides of this parallelogram ACBO does not change even if the rod rotates and the angle of the rod changes. Therefore, if a tension vector BA having a strength proportional to the length of the wire AB is always applied, the force vector BC that pushes up an arbitrary point B on the rod and is parallel to the Y-axis is irrespective of the change in the angle of the rod. , Always constant. The above is the principle of creating a constant force. Next, the principle of adjusting the strength of the above-mentioned constant force will be described with reference to FIG. 7. The wire attached to the point B on the rod is slightly moved in the direction of the origin O, and the new point D is added. The wire is attached to the bar so that the rod is always pulled by the vector DA, and the vector DA pushes up the point DA, the force vector DE parallel to the Y axis, and the force vector DO applied to the point D toward the origin O. Disassembled into parallelogram AEDO
You can In this case, the vector DE also has a constant force, and when a wire is attached to this vector DE and the point B, the point B
Comparing with the constant force vector BC acting on, the strengths are equal. This is always the same regardless of the position of the wire on the rod. However, when the wire is attached to the point D, the strength of the constant force vector BF parallel to the Y-axis that acts on the original point B is calculated by multiplying the vector DE by the length of DO The value is divided by the length of. Therefore, as the position of the wire attached to the rod approaches the origin O, the moment of the force acting on the rod becomes proportionally smaller, so that the constant force parallel to the Y axis acting on an arbitrary point B on the rod becomes proportional. Becomes smaller. The above is the principle of adjusting the strength of a constant force. The structure will be described below. 1 is a balance lift seat, and the whole is composed of a base frame 2, a seat plate 3, a parallel link mechanism portion 4, actuating armrests 5a and 5b, a compression coil spring internal pipe 6, and a wire. 7, a balance adjusting device 8, a braking device 9 and a backrest 10. The base frame 2 includes a lateral frame 2c, a lateral frame 2c and a lateral frame 2c.
It is formed by laterally connecting and joining 2d, and the side frames 2a and 2b have rear end portions and substantially central portions thereof.
Bearing box 1 for ball bearings symmetrically at appropriate positions
1a, 11b, 12a, 12b are arranged, and left and right ball bearing bearing boxes 11a, 1 at the rear ends thereof
The position of the shaft center line of 1b is appropriately set higher than the positions of the shaft center lines of the left and right ball bearing bearing boxes 12a and 12b in the substantially central portion thereof. The seat plate 3 is formed by placing a cushion plate 14 on a seat plate frame 13, and the seat plate frame 13 has seat plate side frames 3a, 3b of L-shaped cross section provided in parallel to the left and right. The seat plate lateral frame 3c is laterally mounted on the front end portion and joined to each other. The ball bearings are symmetrically arranged at appropriate positions in the substantially central portions and front end portions of the seat plate lateral frames 3a and 3b. Bearing boxes 15a, 15b, 16a, 16b
And the positions of the axial center lines of the left and right ball bearing bearing boxes 15a and 15b in the substantially central portion are
Bearing box 16 for left and right ball bearings at its front end
It is appropriately higher than the positions of the axis center lines of a and 16b. Parallel link mechanism part 4 formed on the upper part of the base frame 2.
Is a pair of left and right parallel links 17a, 17b, 18a, 1
8b has an upper end and a lower end, and a support shaft 19 at both ends.
a, 19b, 20a, 20b, 21a, 21b, 22
It is formed by laterally connecting and joining the support shaft rods 19, 20, 21, 22 with the a and 22b projecting therefrom, and the support shafts 20a, 20b, 22a of the support shaft rods 20, 22 at the lower end thereof.
22b is rotatably supported by the ball bearing bearing boxes 11a, 11b, 12a, 12b of the base frame 2 via ball bearings, respectively, and the support shafts 19a of the support shaft rods 19, 21 at the upper ends thereof. 19b, 21a, 21b
The bearing box 1 for the ball bearing of the seat plate frame 13
5a, 15b, 16a and 16b are rotatably supported by ball bearings. The seat plate side frame 3a, 3b and the side frame 2a, 2b are respectively inserted, and the support shafts 19a, 19b, 20a at both ends of the rear upper and lower rear support shaft rods 19, 20 protruding outwardly thereof are inserted.
The pair of left and right actuating armrests 5a and 5b fixed to 20b are
Actuating frames 23a and 23b that rotate in conjunction with the parallel link mechanism unit 4 with the supporting shafts 19a and 19b of the supporting shaft bar 19 at the upper rear as a fulcrum, and an armrest plate 24a fixed to the outer edge of the operating frames 23a and 23b. , 24b, and a transmission arm 25 laid on the support shafts 20a, 20b of the rear lower support shaft rod 20 from the lower ends of the outer edges of the operation frames 23a, 23b.
It is formed integrally with a and 25b. The compression coil spring internal pipe 6 is provided across the backrest 10 at the rear ends of the left and right seat plate side frames 3a, 3b, and the outer frame pipe 26 which is the outer frame of the compression coil spring internal pipe 6 is One end is closed, and a free pulley main body 27 is inserted inside the open end of the outer frame pipe 26. The free pulley main body 27 has a pulley 28 attached to a fork end of a support yoke 29 and a shaft 30.
It is formed by pivotally mounting it through a ball bearing, and rotatably supporting a rotating shaft 31 hung on the base of the support yoke 29 in a bearing box 32 through the ball bearing. One end of a compression coil spring 33 slidably inserted into the outer frame pipe 26 is received and fixed by a spring receiver 34 provided in a bearing box 32, and the other end of the compression coil spring 33 slides the inner side of the outer frame pipe 26. A moving spring receiving lid 35 is attached to the spring receiving lid 35, and a wire 7 is attached to the spring receiving lid 35. The wire 7 is dipped inside the compression coil spring 33 and penetrates through the support yoke 29 and the rotation shaft 31. It goes out through the loose hole and is bent at a right angle through a pulley 28. The balance adjusting device 8 includes the operating frame 2
3a, which is attached to the substantially upper outer edge of the compression coil spring, is extended to the outside of the compression coil spring internal pipe 6, and one end of the wire 7 which is bent at a right angle via a pulley 28 is attached via a wire attachment 36. A support shaft 38 in which the bifurcated tip of the wire attachment 36 is orthogonal to the axial center line of the female screw of the feed nut 37 and is hung vertically on both left and right sides of the feed nut 37.
a and 38b which are pivotally attached to the shafts 38a and 38b
Ball bearings are fitted to a and 38b. At this time, when viewed from the side of the seat, the support shaft 38 of the feed nut 37 is provided.
The length from the intersection of the axial center lines of a, 38b and the female screw to the midpoint of the compression coil spring internal pipe 6 is made to coincide with the length of the deflection of the compression coil spring internal pipe 6, and Center point and spindle 38 of feed nut 37
a line segment connecting the intersections of the respective axial center lines of a and 38b with the female screw and the axial center line of the wire 7 attached to the wire attachment 36 are made to coincide with each other, and further, the left and right parallel support plates Flat rails are formed on the upper surfaces of 39a and 39b, the outer ring of the ball bearing fitted to the support shafts 38a and 38b of the feed nut 37 is rotatably supported on the rails, and wire is attached between the support plates 39a and 39b. Ingredient 3
6 is slidably fitted and screwed into the feed nut 37, and
A support shaft 41 formed at the lower end of the feed screw 40 provided in parallel with the rail is pivotally supported by a bearing 42 integrally formed at the lower end of the support plate 39b, and is located close to the upper part of the support shaft 41. The fixed bevel gear 43 is meshed with the bevel gear 44, and the adjustment handle 45 fixed to the bevel gear 44 is mounted on the bearing 42.
Is pivotally attached by a support shaft 46 hung from the outside to the outside. At this time, the axis center line of the adjustment handle 45 is the operation frame 2
It is perpendicular to 3a. The balance adjusting device 8
Sees from the side of the seat, the extension line of the axial center line of the feed screw 40 intersects with the fulcrum of the operation frame 23a, and
The angle formed by the extension line of the axial center line of the feed screw 40 and the line segment connecting the midpoint of the compression coil spring inner pipe 6 and the fulcrum of the operating frame 23a is defined by the vertical line and the parallel links 17a, 17
It is attached to the operating frame 23a so as to match the angle formed by b, 18a and 18b. The brake device 9 pivotally attaches the brake wheel 54 to the ball bearing bearing box 15b by pivotally attaching the brake wheel 54 to the actuation frame 23b below the armrest plate 24b with a shaft 48 using the hole provided at the rear end of the brake release lever 47 as a fulcrum. It is fixed coaxially, and immediately above it, the handle 50 of the brake is pivotally attached to the operating frame 23b by the shaft 51 with the hole provided at the rear end as a fulcrum.
Brake piece 52 fixed to the lower front end of the handle 50 of the brake
Is pressed against the outer periphery of the brake wheel 54 by a spring 53 attached to the shaft 51 of the brake handle 50, and the upper end of a pull bar 49 bent at a right angle is pivoted into a hole provided in the approximate center of the brake release lever 47. It is formed by pivoting the lower end portion of the pulling bar 49 bent at a right angle to the hole formed at the substantially central portion of the handle 50 of the brake.

[0005]

Since the present invention has the above-mentioned structure, the base plate 2, the seat plate 3 and the parallel link mechanism portion 4 cause the seat plate 3 to have parallel links with the support shafts 20a, 20b, 22a and 22b as fulcrums. 17a, 17b, 18a, and 18b can freely move up and down in parallel from a low sitting posture in which they are laid down in a substantially horizontal direction to a high sitting posture in which they stand upright and rearward. The external tension applied to the wire 7 by the load applied to the seat plate 3 via the parallel link mechanism portion 4 and the operation frame 23a is transmitted to the inside of the compression coil spring internal pipe 6 via the universal pulley body 27, and the spring receiving lid 35 The compression coil spring 33, whose one end is received by the spring receiver 34 and fixed, is compressed by pulling, and as a result, a reaction force acts on the external tension. Seen from the side of the chair,
The length from the intersection of the respective axial center lines of the support shafts 38a, 38b of the feed nut 37 and the female screw to the midpoint of the compression coil spring internal pipe 6 is made equal to the length of the deflection of the compression coil spring 33, and compressed. A line segment that connects the midpoint of the coil spring internal pipe 6 and the intersection of the axial center lines of the support shafts 38a, 38b of the feed nut 37 and the female screw, and the axial center of the wire 7 attached to the wire fitting 36. By pulling the operating frame 23a with the wire 7 in line with the line, the middle point of the compression coil spring inner pipe 6 and the operating frame 2
The feed nut 3 is parallel to the line connecting the fulcrums of 3a and
The force acting on the intersection of the shaft centerlines of the support shafts 38a, 38b of 7 and the female screw can be constantly kept constant regardless of the rotational position of the operating frame 23a, and the balance adjusting device 8 can be provided. , Seen from the side of the chair, the lead screw 40
An extension line of the axis center line of the feed frame 40 and an extension line of the axis center line of the feed screw 40,
The operating frame 23a is made by matching the angle formed by the line segment connecting the midpoint of the compression coil spring inner pipe 6 and the fulcrum of the operating frame 23a with the angle formed by the vertical line and the parallel links 17a, 17b, 18a, 18b. The fixed force can be transmitted to the parallel link mechanism portion 4 via the transmission arms 25a and 25b, and a constant push-up force that pushes up the load applied to the seat plate 3 can be applied. further,
When the adjusting handle 45 is turned, a set of bevel gears 43, 4
4, the feed screw 40 rotates, the feed nut 37 screwed to the feed screw 40 moves accordingly, and
By moving the tip position of the wire 7 attached to the feed nut 37 via the wire attachment 36,
The point of action of the force of the actuating frame 23a moves, the moment of the force acting on the actuating frame 23a is changed, and the constant push-up force that pushes up the load applied to the seat plate 3 right above is applied to the weight of the person sitting on the main chair. It is possible to make fine adjustments in a stepless manner. Also, the brake device 9
When the brake release lever 47 is gripped, the brake release lever 47 rotates about the shaft 48 as a fulcrum, and in conjunction with this, the brake handle 50 moves the shaft 5 through the pull rod 49.
The brake is released by rotating around 1 as a fulcrum and separating the outer periphery of the brake wheel 54 and the brake piece 52 pressed against it, and conversely, when the brake release lever 47 is released, the spring is released. By the action of 53, the brake piece 52 is pressed against the outer periphery of the brake wheel 54 so that the braking force is immediately applied. Therefore, when using the main seat, first, sit down on the standing seat and turn the adjustment handle 45 to balance the constant push-up force that pushes the seat plate 3 right above with the weight of the user. Next, when the brake release lever 47 is grasped and the brake is released, the armrest plates 24a and 24b are rotated downward so as to be pushed forward, and the armrest plates 24a and 24b are rotated backward so as to be raised. . Further, at any height, when the brake release lever 47 is released, the brake is immediately applied and the seat chair can be stopped at that position.

[0006]

As described above, according to the present invention, firstly,
Based on the principle of creating a constant force, the compression coil spring 33
Change the compressive force of the wire into the tension of the wire 7,
Of the actuating frame 23a by pulling the actuating frame 23a with a constant force acting on the actuating frame 23a.
By transmitting the force to the parallel link mechanism 4 via b, it is possible to apply an accurate and constant pushing force to the seat plate 3. Secondly, the operating frames 23a, 23b and the armrests 24a,
24b and the transmission arms 25a, 25b are integrally formed with the operating armrests 5a, 5b.
The upper ends of a, 17b, 18a, and 18b are interlockingly connected to the parallel link mechanism portion 4 pivotally attached to the substantially central portion and the front end portion of both side surfaces of the seat plate, and the compression coil spring internal pipe 6 in which the compression coil spring 33 is installed is provided. Is provided laterally at the rear end of the seat plate 3, and a wire having tension is bent by the compression coil spring thereof at a right angle through the free pulley main body 27, and the operating frame 23a
It is possible to make the output mechanism unit small by attaching it to the parallel links 17a, 18a and 17
The distance between the mounting positions of b and 18b is approximately half the total length of the seat, and the parallel links 17a and 1b
It is possible to reduce the portions of 7b, 18a, 18b that project to the rear of the seat. Third, the operating armrests 5a, 5
b has not only a function as an armrest, but also a function as a handle for lifting and lowering and a function of producing a constant force and transmitting it to the parallel link mechanism section 4 all in one. Fourthly, by providing the balance adjusting device 8, when the feed screw 40 is rotated, the feed nut 37 screwed with the feed screw 40 moves accordingly, and a wire is attached to the feed nut 37. By moving the tip position of the wire 7 attached via the tool 36, the point of action of the force of the actuating frame 23a moves, the moment of the force acting on the actuating frame 23a is changed, and the person sits on the main chair. The constant push-up force that pushes up the seat plate 3 directly above the weight of the person who is standing can be finely adjusted in a stepless manner to be appropriately balanced. Due to the synergistic effect of the above effects, firstly, this balance chair can be operated lightly and safely by a slight force of a person. Secondly, the chair chair itself can be functionally and compactly packed, and it can be used in a small room without any change from an ordinary chair, which is extremely practical. Becomes Thirdly, a single device can handle a wide range of people, which makes it versatile and greatly expands the field of use. For example, in the modern aging society,
Since the number of elderly people with disabilities is increasing, it will be very effective when used for guests with disabilities, such as in parlors such as restaurants and at home.

[Brief description of drawings]

FIG. 1 is a perspective view of a balance lift chair according to the present invention in an upright state.

FIG. 2 is a perspective view showing the lowered balance chair according to the present invention in a lowered state.

FIG. 3 is an exploded perspective view of the balance lift chair according to the present invention.

FIG. 4 is a sectional view of a compression coil spring internal pipe according to the present invention.

FIG. 5 is a perspective view of the balance adjusting device of the present invention.

FIG. 6 is a perspective view of a braking device of the present invention.

FIG. 7 is an explanatory view of the principle of producing a constant force and the principle of adjusting the strength of the constant force of the present invention.

[Explanation of symbols]

3: seat plate, 4: parallel link mechanism part, 5a, 5b: operating armrest, 6: compression coil spring internal pipe, 7: wire, 8: balance adjusting device, 9: brake device, 1
7a, 17b, 18a, 18b: parallel links, 23a,
23b: operating frame, 24a, 24b: armrest plate,
25a, 25b: transmission arm, 26: outer frame pipe,
27: Flexible pulley body, 33: Compression coil spring, 37:
Feed nuts 39a, 39b: support plate, 40: feed screw, 47: brake release lever.

Claims (2)

[Scope of utility model registration request] 1. A balance between a weight of a sitting person and a constant pushing force that pushes up the weight of the sitting person directly above is maintained without using a driving means such as an electric motor or a ratchet, so that In a balance lift seat chair that is lifted and lowered by force, a parallel link mechanism part, which pivotally attaches the upper ends of a pair of parallel links to the front end portions and the substantially central portion of both side surfaces of the seat plate, is provided below the seat plate. A pair of actuating armrests, which are integrally formed from the actuating frame, the transmission arm, and the armrest plate, are provided on both sides of the seat plate by interlocking with the left and right rear links of the parallel link mechanism, and are screwed to the feed nut and the feed nut. A balance adjusting device, which supports the combined feed screw with a support plate, is provided almost at the upper outer edge of the one operation frame, and the free pulley body is inserted inside the open end of the outer frame pipe. In addition, the compression coil spring inserted inside the outer frame pipe receives and fixes one end of the compression pulley spring to the free pulley body, and the compression coil spring is internally attached to the other end of the compression coil spring. A balance lift seat chair, characterized in that a pipe is provided laterally at the rear end of the seat plate and the other end of the wire is attached to the feed nut via the free pulley body. 2. The balance chair according to claim 1, further comprising a brake device having a brake release lever.