JP2018094002A - Brake mechanism and chair with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brake mechanism in which an abutment member comes in contact with a floor to bring the brake into a worked state when releasing the brake by operating a brake lever and getting hand off the brake lever, and also provide a chair with the brake mechanism.SOLUTION: A brake mechanism includes a brake arm shaft 84 including a pressed shaft 86 where a pressing piece 85 connected to a brake lever 9 comes in abutment and a support piece 87, a spring 83 for biasing the support piece 87, a pair of brake arms 89 connected to both ends of the brake arm shaft 84, and an abutment member 82 provided at the end, etc. In the non-operation of the brake lever 9, the spring 83 biases the support piece 87 downward, and thereby the abutment member 82 is pressed on the floor and brake is applied. Also, the brake lever 9 is operated in the direction where the spring 83 compresses the support piece 87 to rotate the brake arm shaft 84, and thereby the abutment member 82 is separated from the floor and the brake is released.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a brake mechanism and a chair including the brake mechanism. More specifically, the brake member is in a state where the brake is effective by contacting the floor surface while the contact member is always lowered, and by operating the brake lever. The present invention relates to a brake mechanism in which an abutting member comes into contact with a floor surface when the brake is released and a hand is released from the brake lever, and the chair is provided with the brake mechanism.

  Japan's aging is rapidly progressing, and the ratio of the elderly to the population has risen significantly. Many elderly people are suffering from weakness of their legs and joint pain, so many people are sitting on their chairs. For these people, sitting on the chair and getting up is a significant burden. Therefore, the present inventor can perform flexion and extension exercises (squats) while sitting on a chair so that the elderly and disabled can maintain and improve muscle strength for walking. The chair provided with the function which assists a burden was developed, and it proposed as shown in patent documents 1-3.

Japanese Patent No. 3795057 Japanese Patent No. 4509214 Japanese Patent No. 5550499

  With these chairs, we were able to maintain and improve muscle strength, but on the other hand, even if we start strength training after getting older and our physical strength and strength weaken, we can expect a little effect once or twice a week. Can not. In addition, it became clear that there are many facilities where it is difficult to individually instruct and continue training according to the level of certified caregivers due to the shortage of care facilities. For this reason, it is very important to make a healthy foundation including muscular strength, starting with a light exercise that moves the body using a small amount of time in daily life from a young age, and habitually exercising exercise. However, it is not easy for people without exercise habits to spend time for exercise such as walking in daily life.

  In this regard, even if busy people who cannot spend time for exercise can use the chair that they spend together the longest in everyday life as a tool for exercise, the joints that form the basis of exercise can be chopped up Since it can be easily moved, it is very effective in the habit of moving the body. In this respect, the chairs of Patent Documents 1 to 3 are mainly intended for exercise and are difficult to use as chairs used in daily life.

  On the other hand, in the act of sitting on a chair, it is common to sit down with the knees bent almost at right angles, but such a sitting posture takes about 40 burdens on the waist and back compared to an upright posture. % Is said to increase. It is said that the sitting method that does not hurt the waist and back muscles is the state of the middle waist where the weight can be divided and supported by the legs and the waist, and chairs to sit in such a posture have been provided, but usually There are few chairs that can be seated in the above state and seated in the middle waist state. Further, it is preferable that the height of the chair can be adjusted as smoothly and finely as possible without causing a mechanical impact.

  Then, the inventor has developed a stopper mechanism that reduces mechanical shock and enables fine adjustment smoothly. By using this new stopper mechanism, the ascending height position and the descending height position of the chair are developed. Has developed a stopper mechanism that enables smooth adjustment and a chair with adjustable height. With this height-adjustable chair, considering the viewpoint of not impairing the function and sense of the chair that has been familiar for many years, even when sitting for a long time, the waist and hips will not hurt It can be seated and can be used as a normal chair, and it can be easily operated while adding functions necessary for performing bending and stretching movements (squats).

  However, when performing squats with the above chair, it is very dangerous if the chair moves easily, so the chair does not move easily from the floor during the squat and must be securely fixed to the floor. is there. Therefore, as a result of intensive studies by the inventor, in a normal state, the contact member is in contact with the floor surface and the brake is always in effect, and the brake is released by operating the brake lever. When the hand is released, the brake mechanism has been developed in which the abutting member comes into contact with the floor surface and the brake is activated. Therefore, an object of the present invention is to provide such a novel brake mechanism. Moreover, an object of this invention is to provide the chair provided with the brake mechanism which can perform a squat safely by applying such a brake mechanism to a chair.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a brake mechanism for restricting the movement of an object, the brake lever provided with a pressing piece movable about an axis, and the pressing piece A brake arm shaft provided with a pressed shaft and a support piece that abut against each other, a spring disposed between the support piece and the object to urge the support piece, and a brake arm shaft disposed at both ends of the brake arm shaft. A brake arm and an abutting member attached to one end of the brake arm, and when the brake lever is not operated, the spring biases the support piece downward to bring the abutting member to the floor surface. By holding in the pressing direction, the brake is always maintained, and the support lever is operated in the direction in which the spring is compressed by the brake lever. Wherein the brake arm shaft is rotated, thereby characterized in that the brake is released by releasing the abutment member attached to one end of the brake arm from the floor by.

  In order to solve the above problem, according to a second aspect of the present invention, in the brake mechanism according to the first aspect, the contact member has a friction that prevents the object from moving by contacting the floor surface. It is characterized by that.

  In order to solve the above problem, the present invention described in claim 3 provides a chair comprising the brake mechanism described in claim 1 or 2.

  In order to solve the above-mentioned problem, the present invention described in claim 4 is a chair provided with the brake mechanism according to claim 3, wherein the link members formed by intersecting two link plates in an X shape are opposed to each other. The link unit is formed by connecting the intersections of the pair of link members opposed to each other by the central axis and connecting the vicinity of the end portions of the link plate by the connection shaft, respectively. A link mechanism that can be expanded and contracted is formed by connecting a plurality of connection shafts on the upper side of the link unit and a connection shaft on the lower side of the other link unit arranged on the link unit, and facing each other. A link spring device constructed by laying an elastic member that urges the link shafts positioned in this way in the direction of extending the link mechanism; The link spring device is a pedestal on which the link spring device is erected and the link shaft on the lower side of the link unit located at the bottom of the link spring device is fixed to the upper surface side, while the link shaft on the other side Comprises a pedestal arranged movably and a seat frame attached to an upper part of the link spring device, and the brake mechanism is provided on the pedestal.

  In order to solve the above-mentioned problem, the present invention according to claim 5 is a chair provided with the brake mechanism according to claim 5, wherein the pressing force of the link spring device is applied between the base and the seat frame. An auxiliary spring mechanism for adjustment is arranged.

  According to the brake mechanism of the present invention, the object can be stably placed on the floor surface because it is always in contact with the floor surface and only needs to be released when the release is necessary. There is.

  Moreover, according to the chair provided with the brake mechanism according to the present invention, the chair is always in contact with the floor surface, and the chair moves freely when it is not intended because the brake is provided to perform the release operation when the release is necessary. There is an effect that it is prevented.

  Moreover, according to the chair provided with the brake mechanism according to the present invention, since the elastic member and the auxiliary spring mechanism that urges the link mechanism constituting the link spring device in the extending direction are provided, the squat motion can be performed safely. There is an effect that can be done.

It is a side view showing one embodiment of a brake mechanism concerning the present invention. It is a bottom view of the brake mechanism shown in FIG. The main part of a brake mechanism is shown, (a) is a side view which shows the whole motion, (b) is a side view which shows the motion of a contact member. It is a side view showing one embodiment of a chair provided with a brake mechanism concerning the present invention. It is a front view of the chair shown in FIG. It is a bottom view of the chair shown in FIG. It is a perspective view which shows the upper surface of a seat frame. It is a perspective view which shows the bottom face of a seat frame. It is a perspective view which shows a base and its periphery structure. It is a perspective view which shows a link spring apparatus. It is a perspective view which shows a link unit. It is a perspective view which shows an auxiliary spring apparatus. It is a bottom view of the seat frame which shows an upper limit stopper. It is a front view which shows a lower limit stopper. The structure of a stopper mechanism is shown, (a) is the state which the stopper worked, (b) is a figure which shows the state which cancel | released the stopper. It is a perspective view which shows the bottom face of a seat frame. It is a perspective view which shows the upper surface of a base.

[Configuration of Brake Mechanism 80]
First, the brake mechanism according to the present invention will be described. FIG. 1 is a side view showing an embodiment of a brake mechanism according to the present invention, and FIG. 2 is a bottom view of the brake mechanism shown in FIG. The illustrated brake mechanism 80 is attached to a chair A (hereinafter simply referred to as “chair A”) using a link spring device that can be expanded and contracted in the vertical direction. As shown schematically in FIG. 4, the chair A includes a seat frame 10, a link spring device 20, auxiliary spring mechanisms 30 and 30 disposed beside the link spring device 20, a pedestal 40, and the pedestal 40. The brake mechanism 80 is attached to the lower surface of the motor. The chair A also includes an ascending stopper mechanism 60 and a descending stopper mechanism 70, and the link spring device 20 is extended and contracted between the ascending position set by the ascending stopper mechanism 60 and the descending position set by the descending stopper mechanism 70. You can do a squat exercise. Details of the structure of the chair A will be described later.

  As shown in FIGS. 1 and 2, the brake mechanism 80 is in contact with the floor surface while the contact member 82 is always lowered, and is brought into contact with the urging force of the spring 83 by pulling the brake lever 81 forward. When the member 82 is separated from the floor surface and the brake is released and the brake lever 81 is released, the contact member 82 comes into contact with the floor surface, and the movement of the chair 1 and the rotation of the leg portion 50 are restricted by the contact friction. It is. The brake lever 81 is movable around a shaft 88 attached to the bottom surface of the base 40, and a pressing piece 85 is provided on the shaft 88. The pressing piece 85 is formed in a substantially “U” shape. The pressing piece 85 is in contact with the rod-shaped pressed shaft 86 at two locations, and the pressed shaft 86 is connected to the brake arm shaft 84 at two locations. Both ends of the brake arm shaft 84 are pivotally supported by bearings 821 and 821, and two support pieces 87 and 87 are provided. A spring 83 is disposed between the support piece 87 and the base 40. Brake arms 89 and 89 are provided at both ends of the brake arm shaft 84, and a contact member 82 is attached to the other end of the brake arm 89. The abutting member 82 is in contact with the floor surface and prevents movement of the chair A by frictional force, and is formed of, for example, a rubber material.

  A leg portion 50 is attached to the lower portion of the base 40. The leg portion 50 is generally configured to include four legs 51 and 51 extending substantially horizontally in four directions and a caster 52 attached to each end thereof.

[Brake mechanism operation]
3A and 3B show a main part of the brake mechanism, in which FIG. 3A is a side view showing the overall movement, and FIG. First, when the brake lever 81 is at the position indicated by the solid line in FIG. 1, the pressing piece 85 is at the position indicated by the solid line in FIG. 3A, and the pressed shaft 86 engaged therewith is indicated by the solid line in FIG. In the position shown. That is, since the pressing piece 87 is urged downward by the urging force of the spring 83, the brake arm shaft 84 is urged in the clockwise direction of FIGS. 1 and 3B. Therefore, the brake arm 89 connected to the brake arm shaft 84 is also biased in the clockwise direction (downward), so that the contact member 82 is placed on the floor surface as shown by the solid line in FIG. It will be pressed. Further, by the rotation of the brake arm shaft 84, the pressed shaft 86 connected to the brake arm shaft 84 is also urged in the clockwise direction, that is, upward, to push up the pressing piece 85, and the brake lever 81 is at the position indicated by the solid line in FIG. Thus, in a state where the brake lever 81 is not operated, the chair A is always in a state of braking, so that the chair A moves even if a little force is applied because the chair A is fixed. There is no.

  Next, when the user manually pulls the brake lever 81 in the direction of the arrow shown in FIG. 1, the brake lever 81 is in the position indicated by the phantom line. Then, as shown in FIG. 3A, the pressing piece 85 changes from the solid line position to the virtual line position. That is, the pressing piece 85 pushes down the pressed shaft 86 and rotates the brake arm shaft 84 counterclockwise, so that the pressing piece 87 rotates counterclockwise and compresses the spring 83 upward. Then, the brake arm 89 is similarly rotated by the counterclockwise rotation of the brake arm shaft 84, and the brake arm 89 is centered on the brake arm shaft 84 as shown in FIG. Change to position. As a result, the contact member 82 is lifted off the floor surface, and the brake is released.

  If the hand is released from the brake lever 81 when the brake is released, the support piece 87 is pushed downward by the spring 83, so that the brake arm shaft 84 rotates clockwise, and accordingly the brake arm 89 also rotates similarly, and the contact member 82 contacts the floor surface. The chair A is braked by the frictional force generated between the contact member 82 and the floor surface, and the movement of the chair A is automatically prevented. On the other hand, since the pressed shaft 86 and the brake arm 89 connected to the brake arm shaft 84 also move from the phantom line position to the solid line position, the brake arm 1 also moves to the position indicated by the solid line again. In this way, since the brake operation is performed only when the user wants to release the brake, it is possible to prevent an accident such as the chair A moving and falling down during exercise.

[Effect of the embodiment]
According to the brake mechanism 80 described above, the contact member 82 is always in contact with the floor surface and the brake is effective, and the brake arm 81 is operated to release the brake when the brake needs to be released. Therefore, when the brake arm 81 is not operated, the contact member 82 is always pressed against the floor surface, and the chair A can be stably fixed to the floor surface. In addition, since the chair A includes the brake mechanism 80, there is an effect that the chair A can be prevented from moving unintentionally.

[Composition of chair A]
Next, the configuration of the chair A will be described with reference to FIGS. As described above, the chair A generally includes the seat frame 10, the link spring device 20, the auxiliary spring mechanisms 30 and 30 disposed beside the link spring device 20, the pedestal 40, and the pedestal 40. And a leg portion 50 attached to the lower surface. The chair A also includes an ascending stopper mechanism 60 and a descending stopper mechanism 70, and the link spring device 20 is extended and contracted between the ascending position set by the ascending stopper mechanism 60 and the descending position set by the descending stopper mechanism 70. You can do a squat exercise.

[Configuration of Seat Frame 10]
As shown in FIGS. 7 and 8, the seat frame 10 is a disk-like frame body in which a part of the peripheral surface is cut linearly, and the ascending stopper mechanism 60 shown in FIG. In addition, a seating surface 102 is attached via a base part 101. An upper limit stopper 69 and a spring 65 shown in FIGS. 13 and 16 are provided on the bottom surface of the seat frame 10. In FIG. 8, these are omitted. Although not shown, a backrest or an armrest can be attached to the seat frame 10. Further, the seat surface 102 is provided with a tilt mechanism 106 on the base 101, and when nobody is seated on the chair A and no load is applied to the seat surface 102, the tilt mechanism 106 is moved by an elastic mechanism (not shown). Is biased so as to be inclined to the state (seat surface 102 ') shown by the phantom line in FIG. As a result, the user rises from the chair 1, and when the seat surface 102 rises to the uppermost position, the user tilts like a seat surface 102 'by an elastic mechanism (not shown) and follows the movement of the user's buttocks. Therefore, since the seating surface 102 is always located in the vicinity of the user's buttocks, the user can sit on the seating surface 102 even during the standing-up operation, so that a sense of security and safety can be ensured. . Further, as will be described later, the seating surface 102 is lowered by pushing the seating surface 102 down by hand.

[Configuration of Pedestal 40]
As shown in FIGS. 6 and 9, the pedestal 40 is formed in a substantially disk shape, and a link spring device 20, an auxiliary spring mechanism 30, a lower limit stopper mechanism 70 described later, and the like are disposed on the upper surface thereof. Further, four legs 50, 50 are attached around the base 40, and the legs 50 are provided with legs 51, 51 and casters 52 provided at one ends of the legs 51, 51, respectively. . In addition, the number of the leg parts 50 is not restricted to four, The suitable number which can hold | maintain the chair A stably can be provided. Further, the pedestal 40 is provided with the brake mechanism 80 described above. Moreover, since the seat frame 10 and the base 40 are required to be rigid, it is preferable to form the seat frame 10 and the base 40 from a metal material.

[Configuration of Link Spring Device 20]
A link spring device 20 is disposed between the upper surface of the base 40 and the bottom surface side of the seat frame 10. As shown in FIG. 10, the link spring device 20 is generally configured by connecting a plurality of link units 200 to 204 having the same structure in the height direction, and each of the link units 200 to 204 will be described below. Is configured to do. That is, as shown in FIG. 11, each link unit 200-204 opposes two link members 206a, 206b, each of which crosses two link plates 205a, 205a (205b, 205b) in an X shape. And the intersections of the link plates 205a and 205b of the link members 206a and 206b are rotatably connected by the central shaft 207, and the end portions of the link plates 205a and 205b are connected to the connecting shafts 208a and 208a, respectively. (208b, 208b). In this way, a link unit 200 (201 to 204 is the same) is formed. A link mechanism that can be expanded and contracted is formed by connecting the plurality of link units 200 to 204 upward as shown in FIG. The link spring device 20 is formed by suspending an elastic member (coil spring) 211 that urges the link mechanism in the extending direction (upward) between the opposing connecting shaft 208a and connecting shaft 208b. Note that support shafts 209a and 209b that are thicker than the connecting shafts 208a and 208b are respectively attached to the uppermost end on one side of the link unit 200 and the lowermost end on one side of the link unit 204, and both ends of the support shafts 209a and 209b are attached. The both ends of the support shaft 209a are in a long hole 63 formed in a pair of upper guide members 62 attached to the bottom surface side of the seat frame 10, and both ends of the support shaft 209b are a pair of attachments attached to the pedestal 40. The inside of the long hole 43 formed in the lower guide member 41 is guided so as to be movable in a state where the movement range is restricted. Further, rollers 210 and 210 are attached to both ends of each of the support shafts 209a and 209b so as to be positioned outside the link plates 205a and 205b. And the lower side of the lowermost link plates 205a, 205a is held by holding members 90, 90 attached to the upper surface of the base 40.

  Note that the link shaft 208a on the upper side of the link unit disposed below the link unit 200, for example, the link unit 201 is connected to the link shafts 208b and 208b on the lower side of the link unit 200 disposed on the upper side. Similarly, the link shafts 208b and 208b are shared by the other link units 202 to 204 as well. As described above, a plurality of link units 200 to 204 are connected in the vertical direction to form an elastic link mechanism. In the present embodiment, five link units 200 to 204 are connected in series, but the number of link units to be connected is not particularly limited.

  Each of the link plates 205a and 205b is formed, for example, by forming a steel plate into an elongated and thin plate shape, and is subjected to punching processing for weight reduction as necessary. In addition, shaft holes (not shown) that pass through both ends of the connecting shaft 208b are formed in the vicinity of both ends of the link plates 205a and 205b, and shaft holes that pass through both ends of the central shaft 207 are formed in the center. (Not shown) is drilled. Therefore, the link plates 205a and 205b are provided with holes at both ends and at least three locations in the center. An E-type retaining ring 212 is externally fitted to each end of the connecting shaft 208b and the central shaft 207 exposed from each shaft hole to prevent the link plates 205a and 205b from falling off the connecting shaft 208b and the central shaft 207. doing. The material and shape of the link plates 205a and 205b are not limited to this, and can be formed of an appropriate material having rigidity.

  The center shaft 207 and the connecting shafts 208a and 208b are formed of, for example, a round bar-shaped metal member. By appropriately adjusting the lengths of the central shaft 207 and the connecting shafts 208a and 208b and the lengths of the link plates 205a and 205b, a stable link spring device 20 having a relatively large mounting area or a more compact mounting area having a small mounting area can be obtained. The link spring device 20 can be used. The expansion and contraction of the link spring device 20 can be made smoother by interposing a ball bearing or the like on the central shaft 207 and the connecting shafts 208a and 208b.

  The elastic member 211 is, for example, a spring, preferably a tension coil spring, and is urged in a direction in which the link mechanism is extended. The elastic member 211 is disposed so as to connect at least two connecting shafts 208a and 208b in the vertical direction. Of course, it is also possible to arrange a plurality of elastic members 211 on one connecting shaft 208a, 208b. Then, the rising pressure of the link spring device 20 can be appropriately adjusted by replacing the elastic member 211 with one having a different spring pressure.

  The link spring device 20 having such a configuration supports the applied load with a strong force in a state where the entire length is long, but works so that the supporting force gradually attenuates as it is pressed and contracted. In addition to a chair provided with an adjusting mechanism, it can also be used as, for example, a lifting device or a shock absorber. Further, since the link spring device 20 itself functions as a structure, an object can be placed directly on the upper portion without providing a support mechanism.

[Configuration of Auxiliary Spring Mechanism 30]
The auxiliary spring mechanism 30 is a mechanism that corrects the attenuation of the support force of the link spring device 20. As described above, the link spring device 20 supports the applied load with a strong force in a state where the entire length is long. However, the link spring device 20 works so that the support force gradually attenuates as it is pressed and contracted. The auxiliary spring mechanism 30 provided between the seat frame 10 and the pedestal 40 assists, and the configuration is shown in FIG. FIG. 12 shows the extended auxiliary spring mechanism 30, and the two auxiliary spring mechanisms 30 are arranged so as to face each other with the link spring device 20 interposed therebetween. The auxiliary spring mechanism 30 is generally formed by overlapping two auxiliary spring units 32 in two stages. In other words, the auxiliary spring unit 32 includes two push springs 302 and 302 disposed above and below the intermediate body 301 and a first end body 303 disposed on an end surface of the push spring 302 positioned on the upper side. A second end body 304 disposed on the end surface of the push spring 302 located on the lower side, a hollow pipe member 305 disposed coaxially inside the lower push spring 302, and a push spring A guide piston 306 is disposed on a diagonal line with 302 interposed therebetween and guides the push spring 302 and the pipe member 305 to expand and contract in a linear direction.

  As shown in FIG. 12, the auxiliary spring mechanism 30 has two auxiliary spring units 32 stacked in the vertical direction as shown in FIG. 12, and the second end body 304 of the upper auxiliary spring unit 32 in the overlapped portion. And the first end portion 303 of the lower auxiliary spring unit 32 are fixed by a fastening member such as a screw. When the auxiliary spring mechanism 30 formed in this way is pressed so as to be compressed, the pipe member 305 is guided through a hole (not shown) provided in the center of the intermediate body 301, and the guide piston 306 is intermediate. Guided through the hole provided on the end side of the body 301. With the configuration in which the pipe member 305 is coaxially built in the push spring 302 and the guide piston 306 is disposed around the push spring 302, the auxiliary spring unit 32 can stably expand and contract without being bent during compression. Further, by replacing the auxiliary spring unit 32 constituting the auxiliary spring mechanism 30 according to the pressing force of the link spring device 20 with an auxiliary spring unit 32 having a pressing spring 302 with an appropriate spring pressure, necessary spring pressure and expansion / contraction The rate etc. can be adjusted.

[Configuration of stopper mechanism 1]
Next, the stopper mechanism 1 will be described. 15A and 15B are plan views showing an embodiment of the stopper mechanism, in which FIG. 15A shows a state where the stopper is effective, and FIG. 15B shows a state where the stopper is released. The illustrated stopper mechanism 1 schematically includes a rack gear member 7 having a substantially rectangular shape in which a first gear groove 7a is provided on one side surface and a second rack gear 7b is provided on the opposite side surface. The first pinion gear 4 that meshes with the first gear groove 7a, the third pinion gear 6 that meshes with the second gear groove, and the first gear groove of the rack gear member 7 that meshes with the first pinion gear 4 The second pinion gear 5 is arranged so as to be able to mesh with 7a. The rack gear member 7 is arranged such that the rack gear member 7 is not fixed and is movable in the length direction, in the left-right direction in FIG.

  The first pinion gear 4 is provided with a gear groove 4a that meshes with the first gear groove 7a along the circumferential direction, and the rotating shaft 4b is fixed at a predetermined position, and freely rotates around the rotating shaft 4b. It is movable, that is, it is free to rotate. Similarly, the third pinion gear 6 is provided with a gear groove 6a that meshes with the second gear groove 7b along the circumferential direction, and the rotation shaft 6b is fixed at a predetermined position, and the rotation shaft 6b is centered. The rotation is free. Similarly, the second pinion gear 5 is provided with a gear groove 5a that meshes with the gear groove 4a of the first pinion gear 4 and the first gear groove 7a of the rack member 7 along the circumferential direction. The rotary shaft 5b is free to rotate. The second pinion gear 5 is arranged so as to mesh with the first pinion gear 4. The rotation shaft 4 b of the first pinion gear 4 and the rotation shaft of the second pinion gear 5 are arranged so as not to disengage this meshing. 5b is mutually connected by the connecting shaft 2. However, the rotating shaft 5b of the second pinion gear 5 is not fixed, and can move around the gear pin 4a while meshing with the gear groove 4a of the first pinion gear 4 as will be described later. A spring 8, which is an elastic member, is bridged between the rotation shaft 5 b of the second pinion gear 5 and the rotation shaft 6 b of the third pinion gear 6, and the second pinion gear 5 is stretched by the spring 8. Is biased in the direction of meshing with the first gear groove 7a. On the other hand, a hand lever 9 is attached to the rotation shaft 5 b of the second pinion gear 5, and a fulcrum shaft 9 a for swinging the hand lever 9 is provided at a midway position of the hand lever 9.

  The third pinion gear 6 may be a roller member having a smooth peripheral surface. In this case, the second gear groove 7b of the rack member 7 is unnecessary, and the third pinion gear 6 rotates while the roller member is in contact therewith. Possible flat surfaces.

[Operation of stopper mechanism]
Next, operation | movement of the stopper mechanism 1 mentioned above is demonstrated. 15A shows a state in which the rack gear member 1 is fixed so as not to move, and FIG. 15B shows a state in which the rack gear member 7 can be moved in the left-right direction. Since the second pinion gear 5 and the third pinion gear 6 are biased so as to be attracted to each other by the spring 8, the second pinion gear 5 is engaged with the first gear groove 7 a of the rack gear member 7. The second pinion gear 5 is connected to the first pinion gear 4 by the connecting shaft 2 while meshing with the first pinion gear 4. In this state, for example, when the rack gear member 7 is moved leftward, the first pinion gear 4 tries to rotate clockwise, so that the second pinion gear 5 meshing with the first pinion gear 4 rotates counterclockwise. Try to rotate. However, since the second pinion gear 5 is also engaged with the first gear groove 7a, the leftward movement of the rack gear member 7a tries to rotate the second pinion gear 5 clockwise. Therefore, it is impossible to rotate in either a force which tends to rotate the force and counter clockwise which tends to rotate clockwise is applied evenly to the second pinion gear 5, after all, the rack gear member 7 Remains fixed in place without moving. When the rack gear member 7 is moved to the right, the operation is opposite to that described above. However, the rack gear member 7 is fixed in place without moving.

  15A, when the hand lever 9 is pulled in the direction of the arrow shown in FIG. 15B, the second pinion gear 5 is connected to the rotating shaft 4a of the first pinion gear 4 by the connecting shaft 2. In addition, the rotating shaft 5a of the second pinion gear 5 and the rotating shaft 6a of the third pinion gear 6 are urged to be attracted to each other by a spring 8, and the rotating shaft 5b of the second pinion gear 5 is also applied. Is not fixed and is free to rotate, the second pinion gear 5 moves while rotating along the periphery of the first pinion gear 4 against the biasing force of the spring 8, and the rack gear The state in which the meshing of the member 7 with the first gear groove 7a is released (the state shown in FIG. 15B) is obtained. In this state, for example, when the rack gear member 7 is to be moved in the left direction, only the first pinion gear 4 and the third pinion gear 6 are engaged with the rack gear member 7, and each of them rotates. The first pinion gear 4 rotates clockwise because the movement is free, and the third pinion gear 6 rotates counterclockwise. At this time, the second pinion gear 5 meshes with the first pinion gear 4 but does not mesh with the first gear groove 7a of the rack gear member 7, so that the clockwise rotation of the first rack gear 4 is prevented. Without doing so, since the second pinion gear 5 is free to rotate, it only rotates counterclockwise. Accordingly, the rack gear member 7 can move in the left direction. When the hand lever 9 is released at an appropriate position, the second pinion gear 5 is pulled toward the third pinion gear 6 by the urging force of the spring 8, and the first gear groove 7a of the rack gear member 7 and The meshed state (the state shown in FIG. 15A) is reached, and the rack gear member 7 is fixed at that position.

[Configuration of Raising Stopper Mechanism 60]
A lift stopper mechanism 60 for restricting the lift position of the link spring device 20 is disposed on the upper surface side of the seat frame 10 as shown in FIG. The ascending stopper mechanism 60 uses the stopper mechanism 1 described above. In other words, the ascending stopper mechanism 60 is roughly composed of the stopper mechanism 1 disposed on the upper surface of the seat frame 10 and the two support portions provided integrally with the rack gear member 7 so as to protrude toward the bottom surface side of the seat frame 10. 67, 67 (see FIG. 8). The support members 67 and 67 are arranged so as to stand on a stopper base 66 provided integrally with the rack gear member 7. The support member 67 is provided with a recess 68, and the recess 68 of the support member 67 hangs on a support shaft 209 a that is positioned at the top of the link spring device 20 and is movably disposed on the bottom surface side of the seat frame 10. Stop. The stopper base 66 is attached with an elastic member that urges the rack gear member 7 backward, that is, a spring 65 in this embodiment (see FIGS. 13 and 16). Accordingly, if the hand lever 9 is operated to release the stopper mechanism 1, the rack gear member 7 can be moved in the front-rear direction, and if the hand lever 9 is released at a predetermined position, the stopper mechanism 1 can be fixed at that position. . When the seat frame 10 is pushed down and the support shaft 209a is moved rearward with the stopper mechanism 1 released, the rack gear member 7 is urged rearward by the spring 65, so that the rack gear 7 also moves rearward at the same time. When the hand lever 9 is released at the appropriate height position, the rack member 7 is fixed at that position by the stopper mechanism 1 and the rise of the link spring device 20 is restricted at a low position.

  On the other hand, when the state of the stopper mechanism 1 is released and the seat frame 10 is not pushed down, the link spring device 20 is biased upward, so that the support shaft 209a is in contact with the support member 67. Thus, the link spring device 20 gradually increases while moving the link member 7 forward. When the hand lever 9 is released at the appropriate height position, the rack member 7 is fixed at that position by the stopper mechanism 1 and the rise of the link spring device 20 is restricted at a high position. The upper guide member 62 is provided with a long hole 63, and both ends of the support shaft 209a are supported in the long hole 63 and the range of back and forth movement of the support shaft 209a is restricted. Yes. Further, the support shaft 209a moves smoothly by the rollers 210 and 210.

  On the other hand, when the ascending stopper mechanism 60 is released, the link spring device 20 is biased in the direction of extending upward, and thus extends to the limit height of the link spring device 20. Therefore, the chair A is provided with an upper limit stopper 69 for regulating the upper limit height position of the link spring device 20. As shown in FIG. 13, the upper limit stopper 69 is constituted by a butterfly bolt attached to the bottom surface side of the seat frame 10 so as to come into contact with a stopper base 66 provided on the back surface of the rack gear member 7 from the front side. . By appropriately tightening or loosening the butterfly bolt and moving the position where the stopper base 66 abuts back and forth, the rack gear member 7 can be restricted from rising.

[Configuration of Lowering Stopper Mechanism 70]
As shown in FIG. 6, the base 40 is provided with a lowering stopper mechanism 70 for adjusting the lowering position of the link spring device 20. The lowering stopper mechanism 70 also uses a stopper mechanism 1 described later, like the rising stopper mechanism 60. That is, the lowering stopper mechanism 70 generally includes a stopper mechanism 1 disposed on the bottom surface of the pedestal 40 and two support portions 47 provided integrally with the rack gear member 7 so as to protrude to the upper surface side of the pedestal 40. 47 is provided. As shown in FIG. 9, the support members 47, 47 are arranged so as to stand on a stopper base 46 provided integrally with the rack gear member 7. The support member 47 is provided with a recess 48, and the recess 48 of the support member 47 latches a support shaft 209 b that is positioned at the lowermost portion of the link spring device 20 and is movably disposed on the upper surface side of the base 40. To do. In addition, a spring 45 is attached to the stopper base 46 in the direction in which the link spring device 20 is raised, that is, an elastic member that urges the rack gear member 7 forward, as shown in FIG. Thus, the rack gear member 7 can be moved in the front-rear direction by operating the hand lever 9 to release the stopper mechanism 1, and the stopper mechanism 1 is fixed at that position when the hand lever 9 is released at a predetermined position. Can do. When the seat frame 10 is pushed down and the support shaft 209b is moved rearward with the stopper mechanism 1 released, the rack member 7 also moves rearward because the support member 47 is in contact with the support shaft 209b. When the hand lever 9 is released at the appropriate height position, the rack member 7 is fixed at that position by the stopper mechanism 1 and the lowered position of the link spring device 20 is restricted.

  On the other hand, when it is desired to set the lowering position of the seat frame 10 to a slightly higher position, the position of the seat frame 10 is set a little higher with the stopper mechanism 1 of the lowering stopper mechanism 70 released. Then, the support shaft 209b moves forward, but the rack member 7 is biased forward by the spring 45, so the support member 47 also moves forward together with the support shaft 209b. When the hand lever 9 is released at the appropriate height position, the rack member 7 is fixed at that position by the stopper mechanism 1 and the lowered position of the link spring device 20 can be set. A long hole 43 is formed in the lower guide member 41, and both ends of the support shaft 209b are supported in the long hole 43, and the range of back-and-forth movement of the support shaft 209b is restricted. Yes. Further, the support shaft 209b moves smoothly by the rollers 210 and 210.

  On the other hand, when the seat frame 10 is lowered with the lowering stopper mechanism 70 released, that is, when sitting on the chair A with the lowering stopper mechanism 70 released, the link spring device 20 is positioned below the limit. Will be lowered. Therefore, the chair A is provided with a lower limit stopper 49 for restricting the lower limit height position of the link spring device 20. As shown in FIG. 14, the lower limit stopper 49 is a rod-like member erected on the upper surface side of the base 40, and the height of the seat surface 102 is 420 to 430 mm, which is the height of a general chair seat surface. It abuts against the bottom surface of the seat frame 10 at such a height. The lower limit stopper 49 can be adjusted in length. For example, the lower limit stopper 49 can be adjusted within a range of ± 50 mm. Similarly to the upper limit stopper 69, the lower limit stopper 49 may be provided with a thumbscrew for restricting the movement of the rack gear member 7 on the upper surface side of the base 40. However, unlike the case of the upper limit stopper 69, in the case of the lower limit, the load impact on the lowering stopper 70 is increased, so that a rod-shaped member is used to avoid such a load impact. In addition, even when performing squats, the operation | movement which falls to the position lower than the height of the seat surface of a general chair is not recommended.

  Thus, the chair A sets the rising position of the seat frame 10 by the rising stopper 60 and sets the lowering position of the seat frame 10 by the lowering stopper 70, so that the seat frame 10, between these set positions, That is, the squat motion can be performed by raising and lowering the seating surface 102. Moreover, when the user is tall, the ascending position and the descending position are set to relatively high positions, and when the user is short, the ascending position and the descending position are set to relatively low positions. Therefore, squats can be performed by appropriately setting the height and expansion / contraction range suitable for the user. Further, the seat surface 102 is regulated at a predetermined height position without being raised to the limit height position of the link spring device 20 by the upper limit stopper 69, and the seat surface 102 is regulated by a lower limit stopper 49. It can only descend to a position similar to the height of the surface.

[Operation of chair A]
Next, operation | movement of the chair A mentioned above is demonstrated. When the user does not sit on the seat surface 102 with the ascending stopper 60 and the descending stopper 70 released, the elastic members 211 of the link spring device 20 exert a force in the direction of pulling the connecting shafts 208a and 208a to each other. The frame 10 tends to extend upward until reaching the limit of the link spring device 20. At this time, when the upper limit stopper 69 contacts the stopper base 66, the movement of the support member 67 that contacts the support shaft 209a is restricted, so that the seating surface 102 stops at the height position without further rising. Thus, the upper limit height of the seat surface 102 is adjusted by appropriately adjusting the upper limit stopper 69.

  When the user pushes down the seat surface 102, such as by sitting on the seat surface 102, the connecting shafts 208a and 208b of the link spring device 20 move gradually away from each other against the pulling force of each elastic member 211. Further, the push spring 302 of the auxiliary spring mechanism 30 is also pushed down, and the auxiliary spring mechanism 30 starts to shrink. When a further load is applied to the seat surface 102, that is, the link spring device 20 and the auxiliary spring mechanism 30, the height of each of the link plates 205a and 205b gradually decreases while the auxiliary spring mechanism 30 also expands. It gets lower. At this time, the link spring device 20 receives the pulling force of the tension spring which is the elastic member 211. Therefore, when the force is applied or released from the upper part, the entire link spring device 20 functions as if it is one spring. It works to flexibly accept the user's weight.

  Here, when the link spring device 20 is lowered to a certain height position, the force to support the load is weakened. On the contrary, the auxiliary spring mechanism 30 requires a strong load with respect to the previous load. . In this way, by combining the link spring device 20 and the auxiliary spring mechanism 30, the push spring 302 compensates for the attenuation of the pressing force of the spring of the link member, so that both spring pressures are balanced and the chair 1 can be lifted and lowered smoothly. It becomes possible to do.

  In such a state, the rising height position when the seat surface 102 is moved up and down can be set by the rising stopper mechanism 60. That is, if the stopper mechanism 1 is released by operating the hand lever 9 of the stopper mechanism 1 constituting the rising stopper mechanism 60, the rack gear member 7 can be moved back and forth, so that the seating surface 102 is at a preferred rising height position. By the way, the stopper mechanism 1 is operated by releasing the hand from the hand lever 9. Thereby, the position where the support member 67 provided on the stopper base 66 attached to the rack member 7 abuts on the support shaft 209a is set. At this time, when the elevation height adjustment is performed while pushing down the seat surface 102, the support shaft 209a moves away from the holding member 67, but the stopper base 66 is urged rearward by the spring 65. Thus, the support member 67 also moves rearward together with the support shaft 209a, so that the rack member 7 can be disposed at a preferred raised height position. Further, when the height of the seat is adjusted while the seat surface 102 is raised, the rack member is appropriately moved because the support shaft 209a moves forward while the link spring device 20 is raised. It can be arranged at the position.

  On the other hand, the descending height position of the seating surface 102 can be set by the descending stopper mechanism 70. That is, when the stopper mechanism 1 is released by operating the hand lever 9 of the stopper mechanism 1 constituting the descending stopper mechanism 70, the rack gear member 7 can be moved back and forth, so that the seat surface 102 is at a preferred descending height position. The stopper mechanism 1 is operated by releasing the hand lever 9. Thereby, the position where the support member 47 provided on the stopper base 46 attached to the rack member 7 contacts the support shaft 209b is set. At this time, when the lowering height adjustment is performed while pushing down the seating surface 102, the rack member 7 is moved since the support shaft 209 b moves rearward as the link spring device 20 is lowered. It can be arranged at an appropriate position. Further, when adjusting the descending height while raising the seat surface 102, the support shaft 209b moves away from the support member 47, but the stopper base 46 is biased forward by the spring 65. Therefore, the support member 47 also moves forward together with the support shaft 209b, so that the rack member 7 can be arranged at a preferred lowering height position.

  By appropriately operating the ascending stopper mechanism 60 and the descending stopper mechanism 70, the ascending height position and the descending height position of the seat surface 102 can be set to desired positions, and the ascending height position where the seat surface 102 is set in advance is set. By moving up and down between the lowering height position and the lowering height position, it becomes possible to perform squats in a state suitable for the user's body shape. Then, if the rising stopper mechanism 60 and the falling stopper mechanism 70 are set so that the rising height position and the falling height position are the same, the seating surface 102 can be fixed at a desired height position. Can be used.

  In addition, it can adjust to the pressing force according to the user by replacing | exchanging the link spring apparatus 20 and the auxiliary | assistant spring mechanism 30 to the thing of appropriate spring pressure. In this case, when the link spring device 20 is replaced, the auxiliary spring mechanism 30 supports the seat frame 10, and when the auxiliary spring mechanism 30 is replaced, the link spring device 20 supports the seat frame 10. The replacement work of the link spring device 20 and the auxiliary spring mechanism 30 can be easily performed without removing the frame 10 or disassembling the whole.

  Various adjustments to the chair A described above can be performed by the user standing in the vicinity of the chair A or by sitting on the seat surface 102.

[Effect of the embodiment]
According to the chair A according to the present embodiment, since the brake mechanism 80 that operates the brake lever 81 only when it is in contact with the floor and is released at all times, there is an effect that it is possible to perform squat safely.

  In addition, according to the chair A according to the present embodiment, the mechanism is simple, there are few failures, and the bending and stretching exercises that are safe and suitable for the user's body can be performed. It has the effect of being applicable to people and students who maintain and improve the lower limb strength of elderly people and who sit in a chair for a long time.

  As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment, and within the scope of the gist of the present invention described in the claims, Needless to say, various modifications and changes are possible. For example, in the present embodiment, the brake mechanism 80 is used for the chair A, but is not limited thereto, and can be attached to various articles.

A Chair 1 Stopper mechanism 2 Connecting shaft 4 First pinion gear 4a Gear groove 4b Rotating shaft 5 Second pinion gear 5a Gear groove 5b Rotating shaft 6 Third pinion gear 6a Gear groove 6b Rotating shaft 7 Rack gear member 7a First Gear groove 7b second gear groove 8 spring 9 hand lever 9a fulcrum shaft 10 seat frame 20 link spring device 30 auxiliary spring mechanism 32 auxiliary spring unit 40 base 41 lower guide member 43 long hole 45 spring 46 stopper base 47 support member 48 Recessed portion 49 Lower limit stopper 50 Leg portion 52 Caster 60 Lift stopper mechanism 62 Upper guide member 63 Long hole 65 Spring 66 Stopper base 67 Support member 68 Recessed portion 69 Upper limit stopper 70 Lowering stopper mechanism 80 Brake mechanism 81 Brake lever 82 Contact member 83 Spring 84 Blur Key arm shaft 85 Pressing piece 86 Pressed shaft 87 Supporting piece 88 shaft 89 Brake arm 90 Holding member 101 Base portion 102 Seat surface 106 Inclination mechanism 200 to 204 Link unit 205a, 205b Link plate 206a, 206b Link member 207 Central shaft 208a, 208b Connecting shaft 209a, 209b Support shaft 210 Roller 211 Elastic member 212 E-type retaining ring 301 Intermediate body 302 Push spring 303 First end body 304 Second end body 305 Pipe member 306 Guide piston

Claims (5)

A brake mechanism for restricting movement of an object,
A brake lever provided with a pressing piece movable around an axis;
A brake arm shaft provided with a pressed shaft and a support piece with which the pressing piece abuts,
A spring disposed between the support piece and the object to urge the support piece;
Brake arms respectively disposed at both ends of the brake arm shaft;
A contact member attached to one end of the brake arm;
With
In a state in which the brake lever is not operated, the spring constantly biases the support piece to hold the contact member in a direction in which the contact member is pressed against the floor surface, so that the brake is always applied. By operating the support piece in the direction in which the spring is compressed by rotating the brake arm shaft, the brake is released by releasing the contact member attached to one end of the brake arm from the floor surface. Brake mechanism characterized by being made. The brake mechanism according to claim 1, wherein
The brake mechanism according to claim 1, wherein the contact member has friction that prevents movement of the object by contacting the floor surface.   A chair comprising the brake mechanism according to claim 1. In the chair provided with the brake mechanism according to claim 3,
The link members formed by crossing two link plates in an X shape are arranged so as to face each other, and the intersections of the pair of link members facing each other are connected by a central axis, respectively, and the end of the link plate A link unit is formed by connecting the vicinity of each part with a connecting shaft, and the upper connecting shaft of the link unit is shared with the lower connecting shaft of another link unit disposed thereon. A link mechanism that is configured by forming a link mechanism that can be expanded and contracted by connecting a plurality of links, and by linking an elastic member that urges the link shafts that are positioned to face each other in a direction in which the link mechanism extends. A spring device;
The pedestal on which the link spring device is erected and arranged, wherein a connection shaft on one side of the lower side of the link unit located at the lowermost part of the link spring device is fixed to the upper surface side, while the connection shaft on the other side Is a pedestal arranged movably,
A seat frame attached to an upper portion of the link spring device;
With
A chair provided with a brake mechanism, wherein the brake mechanism is provided on the pedestal. In the chair provided with the brake mechanism according to claim 5,
A chair provided with a brake mechanism, wherein an auxiliary spring mechanism for adjusting a pressing force of the link spring device is arranged between the base and the seat frame.

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