JP2005118147A - Arm device for bedsides - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arm device for bedsides which fixes the angle between arms regardless of a torque which is applied to the connected section between the arms to hold the posture of the arms. <P>SOLUTION: For this arm device 1 for bedsides, a base 2, a first arm 10, a second arm 20 and a head mount 30 are connected by first to third turning shafts 13, 23 and 33. A first electromagnetic valve 80 is provided in a bypass 45 which communicates two liquid chambers 44a and 44b of a doubly acting type first hydraulic cylinder 40 provided between base 2 and the first arm 10. A second electromagnetic valve 90 is provided in a bypass 55 which communicates two liquid chambers 54a and 54b of a doubly acting type second hydraulic cylinder 50 provided between the first arm 10 and the second arm 20. The first electromagnetic valve 80 and the second electromagnetic valve 90 are operated by buttons 85 and 95 which are arranged on the head mount 30, and thus, the posture of the arm device 1 is changed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bedside arm device in which a base portion is supported on a wall surface around a bed and a tip is positioned and fixed in a space near a nurse.

  In hospitals and nursing welfare facilities, there are space restrictions that can be occupied at the bedside, so reading lighting fixtures and televisions are often placed on the side desk. Since it is relatively light if it is a lighting fixture for reading, the base of the arm of a lighting fixture having a multi-joint can be fixed to a side desk or bed so that it can be illuminated from a desired position as appropriate. . In addition, since LCD monitors have begun to be used on the display screens of televisions and personal computers, the arm has been designed so that the television can be viewed at the desired position and posture on the bed by suspending the television from the tip of an articulated arm. There is also a device.

In particular, in the field of medical equipment, there are arm devices designed to withstand higher suspension loads in order to place an operating light that is heavier than a television used during surgery in any position (eg, , See Patent Document 1). This arm device incorporates a gas cylinder provided so as to balance the weight of the surgical light mounted at the tip, thereby reducing the force for moving the surgical light. The connecting portion is fixed at an arbitrary angle by frictional resistance.
Special table 2003-517883 gazette

  In the arm device that supports the stand, the television, or the surgical light that supports the illumination for reading, an allowable load such as an air cylinder or a spring serving as a balancer is set according to the weight of the object attached to the tip. In these arm devices, the connecting portion is fixed by frictional resistance. The torque applied to each connecting portion of the arm device changes according to the position of the tip, the load applied to the tip, and the posture of the arm device.

  Therefore, when the sliding surface of the connecting portion between the arms wears out, the difference in the balance between the torque acting by the load and the counter-torque acting by the air cylinder or the spring cannot be suppressed by the frictional resistance, The angle cannot be maintained. In addition, since these arm devices are attached to the tip, if the load is extremely different from the load set as the one attached to the tip, the difference in the balance between the torque applied to the connecting portion and the anti-torque is calculated. It cannot be held by frictional resistance. And the front-end | tip of an arm apparatus will shift | deviate from the position which was fixed with slight external force.

  When the arm device is used on the bedside, the user is lying on the bed, so that it is troublesome to get up and adjust the position of the arm device whenever the tip position of the arm device is shifted.

  Therefore, an object of the present invention is to provide an arm device that fixes the angle of the connecting portion and maintains the posture of the arm regardless of the torque acting on each connecting portion between the arms.

  A bedside arm device according to the present invention includes a base supported by a wall, a first arm pivotally supported by a first rotation shaft provided on the base, and a distal end of the first arm. A second arm whose base end is pivotally supported by a second rotation shaft provided; a head mount connected to a third rotation shaft provided at the tip of the second arm; and a first rotation shaft on the base A double-acting first hydraulic cylinder in which the end portions are rotatably supported at a portion separated in the radial direction from the center and in the middle of the first arm, and in the middle of the first arm and the middle of the second arm. A double-acting second hydraulic cylinder in which each part is rotatably supported, and a first solenoid valve provided in the middle of a bypass communicating two liquid chambers provided in the double-acting first hydraulic cylinder; Second solenoid valve provided in the middle of a bypass communicating two fluid chambers provided in a double acting second hydraulic cylinder , And a button for actuating a first solenoid valve and the second solenoid valve is arranged on the head mount.

  Further, in order to reduce the weight mounted on the head mount, the bedside arm device urges a torque that rotates the first arm in the direction opposite to the gravity direction around the first rotation axis. 1 balancer, and a second balancer for biasing torque for rotating the second arm in the direction opposite to the gravity direction around the second rotation axis. The bedside arm device includes a fixing mechanism for fixing the angle between the second arm and the head mount about the third rotation axis. In order to widen the range in which the head mount is positioned, the base of the bedside arm device is pivotally supported by a pivot shaft provided along the direction of gravity.

  Alternatively, the bedside arm device according to the present invention includes a base, a first arm, a link member, a second arm, a head mount, a double-acting first hydraulic cylinder, a double-acting second hydraulic cylinder, 1 solenoid valve, 2nd solenoid valve, 1st button, and 2nd button are provided. In this case, the base is supported by the wall. A pair of first arms are provided, and each base end is pivotally supported by a pair of first rotation shafts provided on the base so as to be separated in parallel to the radial direction. The link member is provided in parallel with the first rotation shaft at each tip of the first arm, and forms a pair of first arm-side second rotation shafts together with the first rotation shaft. Place them in a positional relationship through the corners. A pair of second arms are provided, and each base end is pivotally supported by a pair of second arm side second rotation shafts provided in the link member so as to be separated in parallel to the radial direction. The head mount includes a third rotation shaft provided in parallel with the second arm side second rotation shaft at each tip of the second arm, and a parallelogram with the second arm side second rotation shaft. Are arranged at positions that form a positional relationship passing through the four corners. The double-acting first hydraulic cylinder is supported in such a manner that both end portions thereof are pivotable to one and the other of the first arm apart from each other in the extending direction of the first arm. The double-acting second hydraulic cylinder is supported by one end and the other end of the second arm so as to be rotatable apart from each other in the extending direction of the second arm. A 1st solenoid valve is provided in the middle of the bypass which connects two liquid chambers provided in a double acting 1st hydraulic cylinder. A 2nd solenoid valve is provided in the middle of the bypass which connects two liquid chambers provided in a double acting 2nd hydraulic cylinder. The first button is disposed on the head mount and activates the first electromagnetic valve. The second button is disposed on the head mount and activates the second electromagnetic valve.

  In order to simplify the structure, the double-acting first hydraulic cylinder has a first arm pivotally supported at one end of the first pivot shaft and pivotally supported by the other first pivot shaft. The other end is rotatably supported on the way. Alternatively, the double-acting second hydraulic cylinder has one end pivotally supported on one side of the second arm side second rotating shaft and the second arm side pivoted on the other of the second arm side second rotating shaft. The other end is rotatably supported on the way.

  In order to reduce the weight of what is mounted on the head mount, a first balancer for biasing a torque that rotates the first arm in a direction against the direction of gravity around the first rotation axis, and a second arm side first A second balancer for biasing a torque for rotating the second arm in a direction against the gravity about the two rotation axes is provided. In order to widen the range in which the head mount can be positioned, the base of the bedside arm device is pivotally supported by a pivot shaft provided along the direction of gravity.

  The base is installed on a pedestal that protrudes from a side wall provided in the vertical direction, or is installed on an upper wall (ceiling) that crosses the direction of gravity.

  According to the bedside arm device of the present invention, since the truss structure is formed by the arm and the double-acting hydraulic cylinder, the angle between the arms can be set regardless of the torque acting on the connecting portion between the arms. Can be fixed. Moreover, since the solenoid valve provided in the bypass which connects two liquid chambers of a double acting hydraulic cylinder can be operated with the button provided in the front-end | tip of an arm apparatus, the attitude | position of an arm can be adjusted easily.

  A bedside arm device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 includes a base 2, a first arm 10, a second arm 20, a head mount 30, a double-acting first hydraulic cylinder 40, a double-acting second hydraulic cylinder 50, and a first balancer. 60, a second balancer 70, a first electromagnetic valve 80, a second electromagnetic valve 90, a first button 85, and a second button 95.

  The base 2 is installed on a pedestal 3 protruding from the side wall 201 to which the bed 200 is brought. The base 2 is pivotally supported by a turning shaft 4 provided on the base 3 along the direction of gravity. As shown in FIG. 2, a thrust bearing 5 and a radial bearing 6 are attached between the base 2 and the pedestal 3 in order to reduce the rotational resistance around the pivot shaft 4. Note that a lock mechanism may be provided so as to be stopped at an arbitrary rotational position.

  In the first arm 10, a base end 10 a is pivotally supported on a first rotation shaft 13 provided on the base 2. The first rotation shaft 13 is disposed horizontally. As shown in FIG. 1, the first arm 10 includes a double-acting first hydraulic cylinder 40, a first balancer 60, a double-acting second hydraulic cylinder 50, a second balancer 70, a first solenoid valve 80, and a first solenoid valve 80. 2 A part of the solenoid valve 90 is cut away for mounting.

  In the second arm 20, a base end 20 a is pivotally supported on a second rotating shaft 23 provided at the distal end 10 b of the first arm 10. The second rotation shaft 23 is disposed in parallel with the first rotation shaft 13. The proximal end 20 a of the second arm 20 is connected so as to sandwich the distal end 10 b of the first arm 10 along the second rotation shaft 23. The base end 20a of the second arm 20 may be connected so as to be sandwiched by the tip 10b of the first arm 10, or the tip 10b of the first arm 10 and the base end 20a of the second arm 20 may be connected in the second time. You may connect so that it may overlap along the moving shaft 23. FIG.

  The head mount 30 is rotatably connected to a third rotation shaft 33 provided at the tip 20 b of the second arm 20. Therefore, as shown in FIG. 1, the head mount 30 is suspended from the third rotation shaft 33. The third rotation shaft 33 is disposed in parallel with the first rotation shaft 13 and the second rotation shaft 23. The third rotation shaft 33 is provided with a fixing mechanism 34 that fixes the angle between the second arm 20 and the head mount 30 around the third rotation shaft 33. The head mount 30 further includes a rotation shaft 35 that intersects with the third rotation shaft 33 and a swing shaft 36 that intersects with the rotation shaft 35. Adjusters 37 and 38 are provided for individually rotating and fixing the rotary shaft 35 and the swing shaft 36 at arbitrary angles. The fixing mechanism 34 and the adjusters 37 and 38 may be fixed by frictional resistance by tightening the sliding surfaces with screws. A plurality of gears and worm gears may be combined and fixed.

  A display device 31 such as a television is incorporated in the head mount 30. The display screen 32 of the display device 31 is provided along a plane parallel to the swing shaft 36. At the lower end 30a of the head mount 30, a handle 30b to be held by the user P is formed. In addition to the display device 31, illumination may be incorporated. Further, a slave call device or a telephone (including a videophone) may be incorporated, or a personal computer having these functions may be incorporated.

  Furthermore, in the case of hospitals and nursing welfare facilities, a personal computer incorporated in the head mount of the bedside arm device is linked to the database, a touch panel is used on the display screen, and the nurse's side is located next to the head mount. A reading section is provided to pass a magnetic card storing an ID, etc., or to insert a memory card. The patient's medical record, medication prescription, or electrocardiogram attached to the patient, blood pressure, pulse rate, respiratory rate It is also possible to display a vital signal such as.

  As shown in FIGS. 1 and 2, the double-acting first hydraulic cylinder 40 and the double-acting second hydraulic cylinder 50 include cylinder sleeves 41 and 51, rods 42 and 52, and pistons 43 and 53, respectively. Prepare. The cylinder sleeves 41 and 51 are partitioned into two liquid chambers 44a, 44b, 54a, and 55b by pistons 43 and 53. Each of the liquid chambers 44a, 44b, 54a, and 55b is filled with a liquid substance such as grease having a high viscosity in addition to water and oil. The rods 42 and 52 pass through one end portions 41 a and 51 a of the cylinder sleeves 41 and 51, pass through one liquid chamber 44 a and 54 a, and one ends 42 a and 52 a are fixed to the pistons 43 and 53.

  The double-acting first hydraulic cylinder 40 has one end portion 40a parallel to the radial direction from the first rotation shaft 13 on the base 2 on the opposite side to the side on which the first arm 10 is inclined with respect to the vertical direction. The other end portion 40 b is rotatably supported in the middle of the first arm 10. Thereby, the base 2, the first arm 10, and the double-acting first hydraulic cylinder 40 form a truss structure. In the first embodiment, the first rotation is performed from the connecting portion between the base 2 and the end portion 40a of the double-acting first hydraulic cylinder 40 so that surrounding objects are not caught inside the truss structure. By reducing the distance to the shaft 13, the double-acting first hydraulic cylinder 40 is brought closer to the first arm 10. Moreover, you may attach the cover which covers these further integrally. If the cover is made of a flexible member, it can absorb an impact even if it hits a surrounding object.

  In the double-acting second hydraulic cylinder 50, end portions 50a and 50b are rotatably supported on the middle of the first arm 10 and the middle of the second arm 20, respectively. Thus, the first arm 10, the second arm 20, and the double-acting second hydraulic cylinder 50 form a truss structure. In this case, it is preferable that either one of the end portions 50a and 50b is provided closer to the second rotating shaft 23 so that surrounding objects are not caught inside the truss structure. In the first embodiment, the end 50 b of the double-acting second hydraulic cylinder 50 on the side connected to the second arm 20 is disposed closer to the second rotation shaft 23. Further, the truss structure constituted by the first arm 10, the second arm 20, and the double-acting second hydraulic cylinder 50 is integrally covered with a cover in the same manner as the vicinity of the double-acting first hydraulic cylinder 40. Also good.

  The first balancer 60 includes a coil spring 61, a tension rod 62, an end cap 63, and an end bracket 64 as shown in FIG. One end 61 a side of the coil spring 61 is supported by the tip 62 a of the tension rod 62 via the end cap 63. The base end 62b of the tension rod 62 extends through the coil spring 61 from the other end 61b side, and is pivotally supported on the same axis as the end portion 40a of the double acting first hydraulic cylinder 40 on the base 2 side. ing. The end bracket 64 is fixed in the middle of the first arm 10 and supports the other end side 61 b of the coil spring 61. The end cap 63 can adjust the load applied to the coil spring 61 by adjusting the protrusion of the tip 62 a of the tension rod 62. When the first arm 10 rotates in the direction of gravity about the first rotation shaft 13, the coil spring 61 is compressed between the end cap 63 and the end bracket 64. Therefore, the first balancer 60 biases the torque that rotates the first arm 10 in the direction opposite to the direction of gravity around the first rotation shaft 13.

  The second balancer 70 includes a coil spring 71, an end receiver 72, an end plate 73, and a guide rod 74. The coil spring 71 has end portions 71 a and 71 b supported by an end receiver 72 and an end plate 73. The end receiver 72 is pivotally supported on the same axis as the axis connecting the middle of the first arm 10 and the end 50a of the double-acting second hydraulic cylinder 50. The end plate 73 is fixed in the middle of the guide rod 74 so as to be adjustable. The guide rod 74 is disposed through the coil spring 71, one end 74 a is inserted into the end receiver 72, and the other end 74 b is in the middle of the second arm 20 and a double acting second hydraulic cylinder. It is pivotally supported by the same axis | shaft as the axis | shaft which connects the edge part 50b. When the second arm 20 rotates in the direction of gravity about the second rotation shaft 23, the coil spring 71 is compressed between the end receiver 72 and the end plate 73. Therefore, the second balancer 70 biases a torque that rotates the second arm 20 in the direction opposite to the direction of gravity around the second rotation shaft 23.

  As shown in FIG. 2, the first electromagnetic valve 80 is provided in the middle of a bypass 45 that communicates two liquid chambers 44 a and 44 b provided in the double-acting first hydraulic cylinder 40. The second electromagnetic valve 90 is provided in the middle of the bypass 55 that communicates the two liquid chambers 54 a and 54 b provided in the double-acting second hydraulic cylinder 50. The first solenoid valve 80 and the second solenoid valve 90 block the flow of the bypasses 45 and 55 while the solenoids 82 and 92 for operating the valves 81 and 91 are not energized, and the solenoids 82 and 92 are energized. And act against the springs 83 and 93 to circulate the bypasses 45 and 55.

  The first button 85 and the second button 95 are disposed on a handle 30 b formed on the head mount 30. In the first embodiment, the first button 85 and the second button 95 are arranged one by one at easy-to-operate positions on the left and right ends of the handle 30b so that the user P can operate with either left or right hand. Yes. The first button 85 is connected to the solenoid 82 so that the bypass 45 of the double-acting first hydraulic cylinder 40 flows while the button is pressed. The second button 95 is connected to the solenoid 92 so that the bypass 55 of the double-acting second hydraulic cylinder 50 flows while the button is pressed.

  As shown in FIG. 2, the arm device 1 configured as described above has the double acting first hydraulic cylinder 40 and the double acting first in a state where the first button 85 and the second button 95 are not pressed. Since the bypasses 45 and 55 of the two hydraulic cylinders 50 are blocked, the pistons 43 and 53 are fixed by the liquid substances in the respective liquid chambers 44a, 44b, 54a and 54b. That is, the total length of the double-acting first hydraulic cylinder 40 and the double-acting second hydraulic cylinder 50 does not change. As a result, the arm device 1 forms the truss structure with the base 2, the first arm 10, the double-acting first hydraulic cylinder 40, and the base 2 around the first rotation shaft 13. The angle with respect to the first arm 10 is fixed, and the first arm 10, the second arm 20, and the double-acting second hydraulic cylinder 50 form a truss structure, so that the second rotation shaft 23 is the center. The angle between the first arm 10 and the second arm 20 is fixed.

  Therefore, since the posture of the arm device 1 is kept constant, the position of the head mount 30 does not change. In addition, the arm device 1 does not fix the first rotating shaft 13 and the second rotating shaft 23 with frictional resistance, but generates and secures rigidity by forming a truss structure. In addition, it is not difficult to position the head mount 30 due to aging or wear. Even when the rotational torque applied to the first rotating shaft 13 and the second rotating shaft 23 is different for each posture, or even when the weight of the head mount 30 is extremely different, the arm device 1 maintains the positioned posture. Can continue to maintain. That is, as long as the first electromagnetic valve 80 and the second electromagnetic valve 90 are closed, the arm device 1 has a reaction force by the first balancer 60 and the second balancer 70 that is too high, and the head mount 30 is lifted up. The reaction force is insufficient and the head mount 30 does not slip off.

  A bedside arm device 100 according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. In addition, about the structure which has the same function as the arm apparatus 1 of 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted. The arm device 100 shown in FIG. 3 includes a base 2, first arms 11 and 12, link member 110, second arms 21 and 22, head mount 120, double acting first hydraulic cylinder 40, and double acting second. The hydraulic cylinder 50, the first balancer 60, the second balancer 70, the first electromagnetic valve 80, the second electromagnetic valve 90, the first button 85, and the second button 95 are provided.

  The base 2 is provided with a pair of first rotating shafts 13a and 13b that are spaced apart from each other in the radial direction. The first arms 11 and 12 are provided as a pair, and the base ends 11a and 12a are pivotally supported by separate first rotating shafts 13a and 13b, respectively. The distal ends 11b and 12b of the first arms 11 and 12 are respectively provided with a pair of first arm side second rotating shafts 23a and 23b which are arranged in parallel with the first rotating shafts 13a and 13b. Yes. The link member 110 has a first arm side second position at a position where the first arm side second rotation shafts 23a and 23b and the first rotation shafts 13a and 13b pass through four corners of the parallelogram. Two rotating shafts 23a and 23b are arranged.

  The first rotation shafts 13a and 13b share the positional relationship between the first rotation shafts 13a and 13b and the first arm side second rotation shafts 23a and 23b passing through the four corners of the parallelogram. The plane and the plane shared by the first arm side second rotation shafts 23a and 23b are parallel to each other, and one first rotation shaft 13a and one first arm side second rotation shaft 23a are parallel to each other. The shared plane and the plane shared by the other first rotation shaft 13b and the other first arm side second rotation shaft 23b are parallel to each other.

  In the link member 110, a pair of second arm side second rotating shafts 23c, 23d are arranged in parallel with each other in the radial direction. A pair of second arms 21 and 22 are provided, and base ends 21a and 22a are pivotally supported by separate second arm side second rotating shafts 23c and 23d, respectively. The distal ends 21b and 22b of the second arms 21 and 22 are respectively provided with a pair of third rotating shafts 33a and 33b arranged in parallel with the second arm side second rotating shafts 23c and 23d. ing. The head mount 120 has a third rotation shaft at a position where the second arm side second rotation shafts 23c and 23d and the third rotation shafts 33a and 33b pass through four corners of the parallelogram. 33a and 33b are arranged.

  The positional relationship between the second arm side second rotating shafts 23c, 23d and the third rotating shafts 33a, 33b passing through the four corners of the parallelogram is the second arm side second rotating shafts 23c, 23d. The plane shared by the third and the plane shared by the third rotation shafts 33a and 33b are parallel to each other, and one second arm-side second rotation shaft 23c and one third rotation shaft 33a are parallel to each other. The shared plane and the plane shared by the other second arm side second rotating shaft 23d and the other third rotating shaft 33b are parallel to each other.

  The head mount 120 includes a swing shaft 121 that horizontally rotates the front end 120a. Further, a display screen 32 such as a television or a personal computer is supported on the distal end portion 120 a via a tilt shaft 122. The tilt axis 122 tilts the display screen 32 around a horizontal axis along the display screen 32. In this case, an adjuster 123 that holds the display screen 32 in a tilted state may be provided. The adjuster 123 can be composed of a gear provided on the tilt shaft 122 and a worm gear with a handle. As shown in FIG. 3, the distal end portion 120 a is formed with a reasonable thickness that is easy for the user P to easily grasp. The 1st button 85 and the 2nd button 95 are arrange | positioned in the position which is easy to operate in the state which put the hand on the front-end | tip part 120a.

  The double-acting first hydraulic cylinder 40 has both end portions 40a and 40b spaced apart from each other in the direction in which the first arms 11 and 12 extend, and rotates to one of the first arm 11 and the other first arm 12, respectively. Supported as possible. In this case, in the second embodiment, in order to simplify the structure of the arm device 100, one end 40a of the double-acting first hydraulic cylinder 40 is pivotally supported on one first rotating shaft 13a. The other end 40b is rotatably supported in the middle of the other first arm 12 pivotally supported by the other first rotation shaft 13b.

  The double-acting second hydraulic cylinder 50 has both end portions 50a and 50b spaced apart from each other in the direction in which the second arms 21 and 22 extend, and one second arm 21 and the other second arm 22 are respectively separated. It is rotatably supported. In this case, in the second embodiment, in order to simplify the structure of the arm device 100, one end portion 50 a of the double-acting second hydraulic cylinder 50 is similar to the double-acting first hydraulic cylinder 40. The other end 50b is pivotally supported by one second arm side second pivot shaft 23c, and the other end 50b is halfway along the other second arm 22 pivotally supported by the other second arm side second pivot shaft 23d. Is rotatably supported.

  The first balancer 60 is provided integrally with the double-acting first hydraulic cylinder 40, and the second balancer 70 is provided integrally with the double-acting second hydraulic cylinder 50. The coil spring 61 of the first balancer 60 is externally attached to the rod 42 of the double-acting first hydraulic cylinder 40, and one end 61a is supported by an end plate 65 that is adjustably fixed in the middle of the rod 42. The other end 61 b is supported by the end 41 a of the cylinder sleeve 41. The coil spring 71 of the second balancer 70 is externally attached to the rod 52 of the double-acting second hydraulic cylinder 50, and one end 71 a is supported by an end plate 73 fixed in the middle of the rod 52 so as to be adjustable. The other end 71 b is supported by the end 51 a of the cylinder sleeve 51. The first balancer 60 urges the torque that rotates the first arms 11 and 12 in the direction against the gravity direction, and the second balancer 70 rotates the second arms 21 and 22 in the direction against the gravity direction. Energize the torque to be moved.

  In addition, the pair of first arms 11 and 12 and the pair of second arms 21 and 22 face each other on the open side of the C-shaped or U-shaped cross section, and are always mutually connected regardless of the posture of the arm device 100. The edges 11c, 12c, 21c, and 22c are formed so as to overlap each other. The double-acting first hydraulic cylinder 40, the first balancer 60, and the first solenoid valve 80 are disposed between the first arms 11 and 12 and the double-acting second hydraulic cylinder 50, the second balancer 70, The two solenoid valves 90 are housed between the second arms 21 and 22, respectively. Therefore, the arm device 100 does not have to worry about being caught by the surroundings or being sandwiched between the first arms 11 and 12 and the second arms 21 and 22 and has a good appearance.

  In the arm device 100 configured as described above, when the first electromagnetic valve 80 is closed, the base 2, the double-acting first hydraulic cylinder 40, and the other first arm 12 form a truss structure. Then, the rotation of the first arms 11 and 12 around the first rotation shafts 13a and 13b is fixed. When the second electromagnetic valve 90 is closed, the link member 110, the double acting second hydraulic cylinder 50, and the other second arm 22 form a truss structure, and the second rotating shafts 23a and 23b. The rotation of the surrounding second arms 21 and 22 is fixed.

  Further, in the arm device 100, the pair of first rotation shafts 13a and 13b and the pair of first arm side second rotation shafts 23a and 23b are arranged to form four corners of a parallelogram. Therefore, the link member 110 moves so as to maintain a constant angle with the horizontal plane regardless of the rotation positions of the first arms 11 and 12. Similarly, since the pair of second arm side second rotating shafts 23c, 23d and the pair of third rotating shafts 33a, 33b are arranged to form four corners of a parallelogram, the head mount 120 moves so as to maintain a certain angle with respect to the link member 110 regardless of the rotational positions of the second arms 21 and 22. That is, the head mount 120 is always maintained at a constant angle with respect to the horizontal plane regardless of the posture of the arm device 100. That is, the arm device 100 can change the posture without changing the angle of the display screen 32 such as a television mounted on the head mount 120.

  Thus, in addition to the function of the arm device 1 of the first embodiment, the arm device 100 maintains the angle of the distal end portion 120a with respect to the horizontal plane, so that the board is mounted horizontally on the head mount 120. Therefore, it can be used as a table. In addition, the user P operates the first button 85 and the second button 95 of the distal end portion 120a to change the height as appropriate, and when the user P gets up from the state of sleeping on the bed 200 or rises from the bed 200, the user P sits on the bed 200. It can also be used as a handrail when lifting down.

  In the first and second embodiments, the arm device 1, 100 includes two fluid chambers 44 a, 44 b, 54 a, 54 b of the double-acting first hydraulic cylinder 40 and the double-acting second hydraulic cylinder 50. The bypasses 45 and 55 that communicate with each other are only opened and closed by the first electromagnetic valve 80 and the second electromagnetic valve 90, respectively. However, the pump and the control capable of pumping a liquid substance to the liquid chambers 44a, 44b, 54a, and 54b. The head mounts 30 and 120 may be positioned and operated by operating levers and operation buttons provided on the head mounts 30 and 120. In the first and second embodiments, the arm devices 1 and 100 are installed on the pedestal 3 provided so as to protrude from the side wall 201, but the arm device 1 is mounted on the ceiling that is one of the walls constituting the room. , 100 may be installed.

  In addition, the double-acting first hydraulic cylinder 40 and the double-acting second hydraulic cylinder 50, the first balancer 60, and the second balancer 70 shown in the first and second embodiments have the same functions and operations. Or may be replaced with ones having the same function.

  In the second embodiment, in order to simplify the configuration of the arm device 100, one first arm side second rotating shaft 23a and one second arm side second rotating shaft 23c are provided coaxially. Also good. In this case, even if the front end 11b of one first arm 11 and the base end 21a of one second arm 21 are arranged so as to overlap in the direction along the axis, either one is arranged to sandwich the other. Or either.

The perspective view which shows the arm apparatus for bedsides of 1st Embodiment which concerns on this invention. The block diagram which shows the operation mechanism of the arm apparatus for bedsides shown in FIG. The perspective view which shows the arm apparatus for bedsides of 2nd Embodiment which concerns on this invention. The block diagram which shows the operation mechanism of the arm apparatus for bedsides shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Arm apparatus, 2 ... Base, 4 ... Turning axis 10, 11, 12 ... 1st arm, 10a, 11a, 12a ... Base end, 10b, 11b, 12b ... Other end, 13, 13a, 13b ... 1st 1 rotation axis, 20, 21, 22 ... second arm, 20a, 21a, 22a ... proximal end, 20b, 21b, 22b ... other end, 23 ... second rotation axis, 23a, 23b ... first arm side first 2 rotation shafts, 23c, 23d ... second arm side second rotation shaft, 30 ... head mount, 32 ... display screen, 33, 33a, 33b ... third rotation shaft, 34 ... fixing mechanism, 35 ... rotation shaft , 36 ... Oscillating shaft, 40 ... Double acting first hydraulic cylinder, 40a, 40b ... End, 44a, 44b ... Liquid chamber, 45 ... Bypass, 50 ... Double acting second hydraulic cylinder, 50a, 50b ... End, 54a, 54b ... Liquid chamber, 55 ... Bypass, 60 ... First balancer, DESCRIPTION OF SYMBOLS 0 ... 2nd balancer, 80 ... 1st solenoid valve, 90 ... 2nd solenoid valve, 85 ... 1st button (button), 95 ... 2nd button (button), 100 ... Arm apparatus, 110 ... Link member, 120 ... Head mount 121... Oscillating shaft 122. Inclination shaft 201 201 Side wall (wall)

Claims (2)

A base supported by a wall;
A first arm whose base end is pivotally supported by a first rotation shaft provided on the base;
A second arm whose proximal end is pivotally supported by a second rotation shaft provided at a distal end of the first arm;
A head mount coupled to a third rotating shaft provided at a tip of the second arm;
A double-acting first hydraulic cylinder in which end portions thereof are rotatably supported at a portion radially away from the first rotation shaft on the base and in the middle of the first arm;
A double-acting second hydraulic cylinder whose ends are rotatably supported in the middle of the first arm and in the middle of the second arm;
A first solenoid valve provided in the middle of a bypass communicating two fluid chambers provided in the double acting first hydraulic cylinder;
A second solenoid valve provided in the middle of a bypass communicating two fluid chambers provided in the double acting second hydraulic cylinder;
A bedside arm device comprising: a button disposed on the head mount and operating the first electromagnetic valve and the second electromagnetic valve. A first balancer for biasing a torque for rotating the first arm in a direction opposite to a gravitational direction about the first rotation axis;
2. The bedside arm according to claim 1, further comprising a second balancer that biases a torque that rotates the second arm in a direction opposite to the direction of gravity around the second rotation axis. apparatus.

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