JP2005264971A - Parallel link type instrument support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument support device for providing smooth operability, while preventing sudden inclination of an arm, during getting down an instrument which is attached to a tip of the arm. <P>SOLUTION: In a parallel link type instrument support device, two links 19, 20 each of which has one end pivoted to a fixed side support body 11 and the other end pivoted to an instrument side support body constitute parallel links, and at least part of a vertical motion of the instrument is performed by rotation of the parallel links. A brake disc 43 is disposed on a circumference around a rotation shaft 37 to which one parallel link 23 of the instrument side support body 35 is pivoted, and the one link 23 is brought into slide-contact with the brake pad 43 and is rotated in a whole rotation range of the link 23. Projecting means 41, 42 means for making the brake pad 43 outward when the instrument is moved downward is disposed to the instrument side support body 35. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, two links pivoted at one end to the fixed side support and the other end to the equipment side support are configured as parallel links, and at least a part of the vertical movement of the equipment is defined by the parallel links. The present invention relates to a parallel link type device support device that is rotated.

  In recent years, thin liquid crystal displays, plasma displays, and the like are becoming widespread mainly as displays for personal computers and televisions. Since such a liquid crystal display is thinner than conventional mainstream CRTs and the like, it is convenient without occupying a large space even when it is used on a desk in an office or home, for example.

  In order to use such a liquid crystal display effectively, there are some which are designed to stably move the display to an arbitrary height position by an articulated arm device such as that used in a lighting fixture or the like. As this type of equipment support device, an arm device using a parallel link mechanism that can move without changing the angle has been developed, and the applicant has also developed a parallel link type device support device that can achieve smooth operability. However, a patent application has already been filed (for example, see Patent Document 1).

JP 2003-113916 A (2nd page, FIG. 2)

  However, in a device support device using this type of arm device, when the device supported by the device-side support at the tip of the arm is moved downward, it is pivotally attached to the device support by the load of the device. This makes it easier for the arm being turned to rotate. For this reason, when the user lowers the device, the arm is rotated more than necessary due to the load of the device, the arm may be tilted suddenly, and the device may be wobbled, and smooth operability may not be obtained.

  The present invention has been made paying attention to such problems, and provides an apparatus support device that can obtain smooth operability without the arm tilting suddenly while lowering the apparatus attached to the tip of the arm. The purpose is to do.

In order to solve the above-mentioned problem, the parallel link type device support device according to claim 1 of the present invention includes two devices, one end of which is pivotally attached to the fixed side support and the other end is attached to the device side support. The link is configured as a parallel link, and is a parallel link type device support device that performs at least a part of vertical movement of the device by rotation of the parallel link, and one of the parallel links of the device side support is pivoted. A brake plate is provided on the circumference around the rotation axis to be worn, and the one link is rotated while being slidably contacted with the brake plate in the entire rotation range of the link, and the device is moved downward. The device-side support is provided with a projecting means for projecting the brake plate outward when it is moved to the position.
According to this feature, when the device is moved downward, the braking plate protrudes outward, so that the frictional resistance between the braking plate and one link is increased, and the rotation of one link is increased. When the movement is braked and the device is moved upward, the protruding means does not act, so that the wobble of the device supported by the device-side support can be reduced, and smooth operability can be obtained. .

The parallel link type device support device according to claim 2 of the present invention is the parallel link type device support device according to claim 1, wherein the braking plate and the protruding means are provided on both side surfaces of the device side support. And the one link is composed of a pair of links arranged on both sides of the device-side support.
According to this feature, one of the links arranged on both side surfaces of the device side support is slidably contacted with the brake plates provided on both side surfaces of the device side support, so that the device is moved downward. Thus, when the braking plate protrudes outward, the frictional resistance between one link and the braking plate can be increased, and one link is easily braked.

The parallel link type device support device according to claim 3 of the present invention is the parallel link type device support device according to claim 1 or 2, wherein the brake plate is the rotation shaft of the device side support. Is disposed so as to be movable within a limited range in the arc groove provided on the rear side, and the projecting means is disposed in the inclined groove, the inclined groove formed in the groove bottom of the arc groove, It is comprised with the rotary body which contacted the said braking plate inner surface.
According to this feature, due to the relative angle change between one link and the device-side support, the rotating body moves in a direction protruding from the inclined groove, and the braking plate is pushed out from the inner surface to cause friction with one link. The protruding means for increasing the force can be constructed with a simple configuration of the inclined groove and the rotating body.

A parallel link type device support apparatus according to a fourth aspect of the present invention is the parallel link type device support apparatus according to any one of the first to third aspects, wherein the connecting portion rotates at a joint portion. It is characterized by comprising two sets of parallel links supported movably.
According to this feature, it is possible to move a heavy device forward by using two sets of parallel links.

  Examples of the present invention will be described below.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a perspective view showing an overall image of a parallel link device support apparatus in an embodiment of the present invention. Reference numeral 1 in FIG. 1 denotes a parallel link type device support apparatus to which the present invention is applied. This parallel link type device support apparatus 1 is fixed to the desk 2 via a holder 3 that can hold an end of the desk 2. A liquid crystal display 4 as a device in the present embodiment is attached to the tip.

  As shown in FIG. 1, this parallel link type apparatus support device 1 is configured such that a base body 11 as a fixed side support body standing on a holder 3 is connected to a lower arm 6 by a joint portion 7. In addition, the upper arm 5 and the lower arm 6 are connected by a joint portion 8, and a mounting arm 12 is connected to a tip of the upper arm 5 by a joint portion 9. The liquid crystal display 4 is attached via a bracket 13 provided at the joint 10.

  The joints 7, 8, 9, 10 to which the arms 5, 6, 12 are connected can be rotated by a predetermined angle in the vertical direction, and the user can move the liquid crystal display 4 up and down or back and forth. When moving, the plurality of joints 7, 8, 9, and 10 are rotated, and the base body 11 as a fixed support in the present embodiment of the lower arm 6 is connected to the vertical shaft 14 of the holder 3. The liquid crystal display 4 can be supported by moving the liquid crystal display 4 to an arbitrary position on the desk 2.

  Further, the joint portion 10 connected to the mounting arm 12 can also be rotated in the horizontal direction, and the orientation of the liquid crystal display 4 can be changed in the horizontal direction. The rotation of the joint 10 can be performed within a range of approximately one rotation (about 400 °), and the screen of the liquid crystal display 4 can be used by changing the orientation to be easy for the user to see.

  Further, the outer sides of the upper arm 5 and the lower arm 6 shown in FIG. 1 are configured by cover bodies 15 and 16, and some covers 15 a and 16 a of the cover bodies 15 and 16 are connected to the cover bodies 15 and 16. The electric cable 17 connected to the liquid crystal display 4 can be disposed inside the cover bodies 15 and 16 by removing the covers 15a and 16a.

  Further, the horizontal rotation of the joint portion 10 connected to the mounting arm 12 is restricted within a range of about one rotation (about 400 °), and the liquid crystal display 4 is moved from the tip of the upper arm 5. The extending electric cable 17 is not entangled with the mounting arm 12.

  FIG. 2 is a side view showing the internal structure of the parallel link device support apparatus 1, and hereinafter, the right side of FIG. A substantially horizontal upper arm 5 is connected to the upper end of the lower arm 6 extending in the vertical direction via a joint portion 8, and the outer sides of the arms 5 and 6 are covered with cover bodies 15 and 16. .

  Two bar-shaped links 19 and 20 extending in the vertical direction are arranged in parallel inside the cover body 16 of the lower arm 6 that is vertically erected, and a joint plate 18 is disposed inside the joint portion 8. Has been placed. The upper ends of the links 19, 20 of the lower arm 6 are pivotally attached to the rotation shafts 25, 26 provided on the joint plate 18, and the lower ends of the links 19, 20 are the rotations provided on the base body 11. Each is pivotally attached to the moving shafts 27 and 28.

  A tension spring 21 composed of a coil spring or the like is disposed between the two links 19 and 20 of the lower arm 6 shown in FIG. 2, and the upper and lower ends of the tension spring 21 are links 19 disposed forward. And the lower part of the link 20 arranged on the rear side. Since the tension spring 21 is disposed between the two links 19 and 20, the lower arm 6 is biased so as not to tilt forward.

  Similarly to the lower arm 6 described above, two bar-like links 22 and 23 extending in the front-rear direction are arranged in parallel inside the cover body 15 of the upper arm 5 that is horizontal. The joint base 34 is disposed as a device side support in the present embodiment. The front ends of the links 22 and 23 of the upper arm 5 are pivotally attached to rotating shafts 36 and 37 provided on the joint base 34, respectively, and the rear ends of the links 22 and 23 are provided on the joint plate 18. The pivot shafts 25 and 35 are pivotally attached.

  A tension spring 24 is disposed between the two links 22 and 23 of the upper arm 5 shown in FIG. 2, and the front and rear ends of the tension spring 24 are located above the front portion of the link 23 disposed below and above. It is hooked on the rear part of the link 22 arranged. Since the tension spring 24 is disposed between the two links 22 and 23, the upper arm 5 is biased so as not to tilt downward.

  Further, using FIG. 2 as an example, the upper arm 5 will be described in detail with respect to the parallel link mechanism. The upper link 22 and the lower link 23 arranged inside the upper arm 5 are respectively connected to the rotation of the joint plate 18. The lines connecting the moving shafts 25 and 35 and the rotating shafts 36 and 37 of the joint base 34 are formed at equal distances, and are connected between the rotating shafts 25 and 35 and the rotating shafts 36 and 37. A parallelogram is formed by the two links 22 and 23.

  The upper end of the tension spring 24 is fixed to the front part of the upper link 22, and the lower end of the tension spring 24 is fixed to the rear part of the lower link 23, and the rotation shaft of the joint base 34 is applied by the urging force of the tension spring 24. 37 and the rotation shaft 35 of the joint plate 18 are biased so as to attract each other.

  When the upper arm 5 is inclined downward, the relative vertical and longitudinal positions of the two rotary shafts 25 and 35 in the joint plate 18 and the relative vertical and vertical positions of the two rotary shafts 36 and 37 in the joint base 34 are shown. Since the upper link 22 and the lower link 23 are inclined without changing the front-rear position, the upper arm 5 is not easily inclined downward by the urging force of the tension spring 24.

  Therefore, the load of the mounting arm 12 and the liquid crystal display 4 connected to the front end of the upper arm 5 can be resisted, and the upper arm 5 becomes difficult to tilt downward, and when the liquid crystal display 4 is moved downward. Since the relative vertical and forward / backward positions of the two rotation shafts 36 and 37 in the joint base 34 are not changed, the mounting arm 12 can be moved downward while maintaining almost vertical without being inclined.

  The joint base 34 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is an exploded perspective view of the joint base 34, and FIG. 4 is an assembled perspective view of the joint base 34. The right side of 4 is assumed to be the front.

  As shown in FIG. 3, the joint base 34 provided inside the joint portion 9 has a substantially circular shape, and a lower link 23 as one link in this embodiment is pivotally attached to the center portion of the circle. An insertion hole 39 through which a rotating shaft 37 made of a member such as a bolt is inserted is disposed, and the upper portion of the joint base 34 is made of a member such as a bolt on which the upper link 22 is pivotally attached. An insertion hole 38 through which the rotating shaft 36 is inserted is provided.

  A semicircular arc groove 40 is formed along the circumference of the joint base 34 on the rear side of the insertion hole 39 through which the rotation shaft 37 to which the lower link 23 of the joint base 34 is pivotally attached is inserted. A plurality of inclined grooves 41 are formed at the groove bottom in the circular arc groove 40.

  Corresponding to one inclined groove 41, a cylindrical bearing 42 as a rotating body in this embodiment is arranged, and this bearing 42 is arranged so that the axial direction faces the center of the joint base 34. . A brake plate 43 having substantially the same shape as the arc groove 40 can be disposed in the arc groove 40, and the upper and lower ends of the brake plate 43 are formed slightly shorter than the arc groove 40. When arranged inside 40, it can move slightly in the circumferential direction.

  Further, as shown in FIG. 3, the brake plate 43 is provided with a long hole 45 through which a latching tool 44 made of a member such as a screw is inserted at three locations, an upper portion, a central portion, and a lower portion. The long hole 45 has an elliptical shape that is long in the circumferential direction. The long hole 45 can be inserted into the screw portion of the hook 44, but has an inner diameter that allows the screw head to be hooked without being inserted. Has been.

  The hook 44 is inserted into the long hole 45 of the brake plate 43 and screwed into a screw hole 46 formed in the arc groove 40, so that the brake plate 43 is attached to the arc groove 40. Since the latching tool 44 is inserted into the long hole 45 formed in the brake plate 43, the brake plate 43 is slightly moved in the circumferential direction, and the screw portion of the latching tool 44 is The brake plate 43 is loosely fitted into the long hole 45, so that the brake plate 43 is slightly moved in the left-right direction (outer / inner direction).

  As shown in FIG. 4, after the brake plate 43 is attached inside the arc groove 40, the upper and lower two links 22 and 23 are moved by the rotation shafts 36 and 37 inserted through the insertion holes 38 and 39 of the joint base 34. The upper link 22 and the lower link 23 are each configured as a pair, and the upper and lower links 22, 23 are connected to the joint base 34. It is arranged on the outside of the left and right side surfaces.

  The bearing 42 disposed in the arc groove 40 will be described in detail with reference to FIG. 5. FIG. 5A is a cross-sectional view taken along the line AA of the joint base 34 in FIG. 4, and FIG. It is AA sectional drawing similar to (a) of the joint base 34 when the liquid crystal display 4 is lowered.

  As shown in FIG. 5A, the arc groove 40 is formed on both the left and right side surfaces of the joint base 34, and the inclined groove 41 formed on the bottom surface of the arc groove 40 has a tapered surface inclined in the vertical direction. The inclined groove 41 is formed so that the depth becomes deeper as it goes downward. A braking plate 43 is disposed in the arc grooves 40 formed on the left and right side surfaces of the joint base 34, and the bearing 42 disposed in the inclined groove 41 in the arc groove 40 is connected to the bottom surface of the inclined groove 41 and the braking groove. It arrange | positions so that it may be pinched | interposed between the inner surfaces of the board 43, and it always contacts | abuts to the inclination groove | channel 41 and the brake plate 43. FIG.

  The lower link 23 is provided outside the left and right side surfaces of the joint base 34 so as to sandwich the joint base 34 from both the left and right sides. The inner side surface of the lower link 23 is always in contact with the brake plate 43. When the lower link 23 is rotated in the vertical direction, the inner surface of the lower link 23 is slidably contacted with the outer surface of the brake plate 43 in the entire rotation range of the lower link 23. It is like that.

  As shown in FIG. 5B, when the liquid crystal display 4 is moved downward, the brake plate 43 is provided behind the pivot shaft 37 of the lower link 23 in the joint base 34. The lower link 23 is moved while being in sliding contact with the brake plate 43 from below to above.

  When the lower link 23 is moved upward with respect to the joint base 34, the brake plate 43 slidably contacted with the lower link 23 causes a frictional resistance acting on the lower link 23 and the outer surface of the brake plate 43. Is moved upward. Then, the bearing 42 disposed in the inclined groove 41 in the arc groove 40 is moved upward while being sandwiched between the inclined groove 41 and the inner surface of the brake plate 43.

  When the bearing 42 shown in FIG. 5B is moved upward, the bearing 42 is moved outward along the tapered surface of the inclined groove 41, and presses the inner surface of the brake plate 43 outward. The frictional resistance between the brake plate 43 and the link 23 is increased, and the rapid downward movement of the liquid crystal display 4 is suppressed. In this manner, the projecting means in this embodiment can be provided with a simple configuration of the plurality of inclined grooves 41 formed in the arc grooves 40 and the bearings 42 disposed in the inclined grooves 41.

  Next, the joint base 34 and the lower link 23 when the liquid crystal display 4 is moved up and down will be described in detail with reference to FIGS. 6 to 8. FIG. 6 is a side view showing the joint base 34. 7 is a side view showing the joint base 34 when the liquid crystal display 4 is lowered, and FIG. 8 is a side view showing the joint base 34 when the liquid crystal display 4 is raised. The right side will be described as the front.

  As shown in FIG. 6, when the upper arm 5 is in the horizontal state, the brake plate 43 is moved downward, and the lower end of the brake plate 43 is in contact with the lower end in the arc groove 40. At this time, as shown in FIG. 5A, the bearing 42 is moved below the inclined groove 41, and the width D between the outer surfaces of the left and right brake plates 43 attached to the joint base 34 is narrow. It has become.

  As shown in FIG. 7, when the liquid crystal display 4 attached to the tip of the attachment arm 12 is lowered, the lower link 23 is moved upward with respect to the joint base 34, and the brake plate 43 has an arc groove. 40, and moves upward until the upper end of the brake plate 43 comes into contact with the upper end of the arc groove 40.

  When the brake plate 43 is raised, the bearing 42 disposed in the inclined groove 41 formed in the arc groove 40 is caused by friction caused by sliding contact with the inner surface of the brake plate 43 as shown in FIG. The left and right braking plates 43 attached to the joint base 34 protrude outwardly (in the left-right direction). The width D ′ in between increases gradually.

  Then, the braking plate 43 shown in FIG. 5 (b) presses the inner surface of the lower link 23, so that the frictional resistance acting between the outer surface of the braking plate 43 and the inner surface of the lower link 23 is reduced. The rotation of the lower link 23 is braked. Therefore, when the user lowers the liquid crystal display 4, the upper arm 5 is not rotated more than necessary due to the load of the liquid crystal display 4, and wobble can be reduced, so that smooth operability is obtained. It is supposed to be.

  Also, the two lower links 23 attached to the left and right side surfaces of the joint base 34 are in sliding contact with the two braking plates 43 provided on the left and right sides of the joint base 34. The frictional resistance with the braking plate 43 can be increased, and the lower link 23 is easily braked.

  As shown in FIG. 8, when the liquid crystal display 4 attached to the tip of the attachment arm 12 is lifted, the lower link 23 is moved downward with respect to the joint base 34, and the brake plate 43 has an arc groove. It moves downward along 40 and is lowered until the lower end of the brake plate 43 comes into contact with the lower end of the arc groove 40.

  When the brake plate 43 is lowered, the bearing 42 disposed in the inclined groove 41 formed in the arc groove 40 causes a frictional force due to sliding contact with the inner surface of the brake plate 43 as shown in FIG. The left and right brake plates 43 attached to the joint base 34 are moved inwardly (left and right direction), and the outside of each of the left and right brake plates 43 is moved. The width D between the side surfaces becomes gradually narrower.

  Then, the frictional resistance acting between the outer surface of the brake plate 43 and the inner surface of the lower link 23 shown in FIG. 5B is reduced, and the lower link 23 is easily rotated. When the user lifts the liquid crystal display 4, the load on the liquid crystal display 4 is applied and it may be difficult to lift, but the frictional resistance acting between the brake plate 43 and the lower link 23 is reduced. Therefore, smooth operability can be obtained.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the brake plates are arranged on both the left and right side surfaces of the joint base, and these brake plates are respectively slid on the inner surfaces of the two lower links attached to the outer sides of the left and right side surfaces of the joint base. However, the present invention is not limited to this, and a braking plate is provided on one side surface of the joint base, and one of the two lower links is attached to one of the links. You may make it slidably contact.

  In the above embodiment, the protruding means is constituted by the inclined groove formed in the arc groove and the bearing. However, the present invention is not limited to this, and the inward direction corresponds to the inclined groove. The protruding part is extended from the inner surface of the braking plate, and the inclined groove and the protruding part constitute a protruding means. When the braking plate is moved upward, the protruding part is moved outward along the inclination of the inclined groove. The brake plate may be protruded outward by being pressed.

  Furthermore, in the above embodiment, the cylindrical bearing as the rotating body is disposed in the inclined groove formed in the arc groove, but the present invention is not limited to this, and the spherical bearing May be arranged in the inclined groove, and not limited to the bearing, a cylindrical gear is arranged in the inclined groove, and the teeth engaged with the gear are connected to the inner surface of the inclined groove and the braking plate. When the brake plate is moved upward, the gear is moved upward along with the brake plate, and this gear presses the brake plate outward to project the brake plate. Good.

It is a perspective view which shows the whole image of the parallel link type apparatus support apparatus in the Example of this invention. It is a side view which shows the internal structure of a parallel link type apparatus support apparatus. It is a disassembled perspective view of a joint base. It is an assembly perspective view of a joint base. (A) is AA sectional drawing of the joint base in FIG. 4, (b) is sectional drawing of a joint base when an apparatus is lowered | hung. It is a side view which shows a joint base. It is a side view which shows a joint base when a liquid crystal display is lowered | hung. It is a side view which shows a joint base when a liquid crystal display is raised.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Parallel link type apparatus support apparatus 2 Desk 3 Holder 4 Liquid crystal display 5 Upper arm 6 Lower arm 7, 8, 9, 10 Joint part 11 Base body 12 Mounting arm 13 Bracket 14 Vertical shaft 15, 16 Cover body 15a, 16a Cover 17 Electrical cable 18 Joint plate 19, 20 Link 21 Tension spring 22, 23 Link 24 Tension spring 25, 26 Rotating shaft 27, 28 Rotating shaft 34 Joint base 35, 36, 37 Rotating shaft 38, 39 Insertion hole 40 Arc groove 41 Inclined groove 42 Bearing 43 Brake plate 44 Stopper 45 Long hole 46 Screw hole

Claims (4)

  The two links pivoted on one end are fixed to the fixed support and the other end are connected to the device side support, respectively, are configured as parallel links, and at least part of the vertical movement of the device is performed by rotating the parallel links. A parallel link type device support device, wherein a brake plate is provided on a circumference around a rotation shaft on which one of the parallel links of the device side support is pivotally mounted, and the one link is the link And a projecting means for projecting the brake plate outward when the device is moved downward and is slidably contacted with the brake plate. A parallel link type apparatus support device provided on a support.   The brake plate and the projecting means are provided on both side surfaces of the device-side support, and the one link is composed of a pair of links disposed on both sides of the device-side support. The parallel link type apparatus support device according to claim 1.   The brake plate is disposed so as to be movable in a limited range within an arc groove provided on the rear side of the rotation shaft of the device-side support, and the protruding means is provided at the groove bottom of the arc groove. The parallel link type apparatus support device according to claim 1 or 2, comprising a formed inclined groove and a rotating body disposed in the inclined groove and in contact with the inner surface of the brake plate.   The parallel link device support device according to any one of claims 1 to 3, wherein the parallel link includes two sets of parallel links in which a connecting portion is rotatably supported by a joint portion.

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