JP2005264970A - Parallel link type instrument support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instrument support device for 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 on a fixed side support body 11 and the other end pivoted on 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 first moving shaft 31 moving within a limited range in a circumferential direction is disposed on a circumference around a rotation shaft 27 on the fixed side support body 11 side to which one parallel link 19 is pivoted, and a first urging means 33 is disposed to the circumference to elastically urge the first moving shaft 31. Since one link 19 is brought into contact with the first moving shaft 31 from a position where the one link 19 is slightly inclined forward up to a forward inclination limit position, the forward rotation of the one link 19 is suppressed. <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 arm with the device attached to the tip is tilted from the vertical state, it is added to the pivotally attached portion of the arm fixed to the desk or the like. The moment increases as the arm approaches the horizontal state from the vertical state. Therefore, in the middle of the user lowering the device attached to the tip of the arm, the arm may incline suddenly due to an increase in the moment applied to the pivot attachment.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide a device support device that can prevent the arm from inclining suddenly while lowering the device attached to the tip of the arm. And

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 the vertical movement of the device by the rotation of the parallel link, and the fixed side support to which one of the parallel links is pivotally attached A first moving shaft that moves in a limited range in the circumferential direction is provided on a circumference around the rotation shaft on the body side, and first biasing means that elastically biases the first moving shaft is provided, The one link is in contact with the first moving shaft between the position where the link is slightly inclined forward and the position where the forward inclination is limited, so that the forward rotation of the one link is suppressed. It is characterized by.
According to this feature, when the device attached to the device-side support side is moved downward, as one link of the parallel links approaches the forward tilt limit position, the one link on the fixed-side support side Although the moment applied to the rotating shaft increases, the elastically biased first moving shaft is brought into contact with the inclined one link, and the forward rotation of one link is biased. , It will be possible to counter the increase in moment applied to the rotating shaft, so that the parallel link will not incline suddenly during the lowering of the device, and the device will not drop suddenly. Although it becomes difficult to lift by adding its own weight, the first urging means restrains one link from rotating backward via the first moving shaft, so that it is easy to lift the device.

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 parallel link type device support device is limited in a circumferential direction on a circumference around the rotation axis. A second moving shaft for moving the range, and a second urging means for elastically urging the second moving shaft, wherein the one link is between the substantially vertical position and the rear tilt limit position. When the link is in contact with the second moving shaft, the backward rotation of the one link is suppressed.
According to this feature, when the device attached to the device-side support is moved backward, one of the parallel links is rotated backward about the rotation axis on the fixed-side support, The moment applied to the dynamic axis increases as one link moves from the substantially vertical position to the tilt limit position. For this reason, the parallel link may suddenly tilt backward while the device is moved backward, but the elastically biased second moving shaft is brought into contact with the tilted link and moved backward of the one link. Therefore, the increase in the moment applied to the rotation shaft can be countered, and the parallel link can be prevented from suddenly tilting backward.

A parallel link type device support apparatus according to a third aspect of the present invention is the parallel link type device support apparatus according to the second aspect, wherein the first biasing means and the second biasing means are in a side view. The leaf spring is composed of one leaf spring having a substantially rectangular shape, and each end of the leaf spring is set to the first moving shaft and the second moving shaft, respectively, and the leaf spring includes the first moving shaft and the first moving shaft. The second moving shaft is elastically biased so as to be separated from each other in the circumferential direction.
According to this feature, since the functions of both the first urging means and the second urging means can be provided by a single leaf spring, the urging means can be configured with a simple structure.

According to a fourth aspect of the present invention, there is provided the parallel link device support apparatus according to the third aspect, wherein the first movement axis and the second movement axis are independent arcs. It is characterized by moving in the groove.
According to this feature, the inclination limit position of the link can be easily set by changing the length between both ends of each arc groove.

A parallel link type device support apparatus according to a fifth aspect of the present invention is the parallel link type device support apparatus according to any one of the first to fourth 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 sufficiently withstand the biasing means even if the moment applied by moving the heavy equipment forward is increased 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 as a device side support in the present embodiment is connected by a joint portion 9 to the tip of the upper arm 5. The liquid crystal display 4 is attached to the tip of the attachment arm 12 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 around an axis perpendicular to the paper surface, and the user moves the liquid crystal display 4 up and down. When moving or moving back and forth, the joints 7, 8, 9, and 10 are rotated, and the base body 11 of the lower arm 6 is horizontally oriented with respect to the vertical shaft 14 of the holder 3. The liquid crystal display 4 can be supported by moving it 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. , 23, a tension spring 24 is arranged, and the front and rear ends of the tension spring 24 are hooked on the front part of the link 23 arranged below and the rear part of the link 22 arranged above. ing. 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 lower arm 6 will be described in detail with respect to the parallel link mechanism. The front link 19 and the rear link 20 arranged inside the lower arm 6 are respectively connected to the rotation of the base body 11. Lines connecting the moving shafts 27 and 28 and the rotating shafts 25 and 26 of the joint plate 18 are formed at equal distances, and are connected between the rotating shafts 27 and 28 and the rotating shafts 25 and 26. A parallelogram is formed by the two links 19 and 20.

  The upper end of the tension spring 21 is fixed to the upper part of the front link 19, and the lower end of the tension spring 21 is fixed to the lower part of the rear link 20, and the pivot shaft 25 of the joint plate 18 is applied by the urging force of the tension spring 21. And the rotation shaft 28 of the base body 11 are biased so as to attract each other.

  When the lower arm 6 is tilted forward, the relative vertical and longitudinal positions of the two rotational shafts 25 and 26 in the joint plate 18 and the relative vertical and vertical positions of the two rotational shafts 27 and 28 in the base body 11. Since the front link 19 and the rear link 20 are inclined without changing the front-rear position, the lower arm 6 is difficult to tilt forward by the urging force of the tension spring 21.

  Therefore, the load of the upper arm 5 and the liquid crystal display 4 connected to the upper end of the lower arm 6 can be counteracted, the lower arm 6 does not fall forward, and the liquid crystal display 4 is moved forward. Since the relative vertical and front / rear positions of the pivot shafts 25 and 26 in the joint plate 18 are not changed, the upper arm 5 can be moved forward without being inclined downward and kept substantially horizontal.

  The base body 11 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a side view showing the base body 11 when the lower arm 6 is in a vertical state, and FIG. 4 is a side view of the base body 11 in FIG. FIG. 4 is a cross-sectional view taken along the line AA, and the right side of FIG. As shown in FIG. 3, the upper part of the base body 11 provided in the joint part 7 has a substantially circular shape, and the lower part of the front link 19 as one link in the present embodiment is formed in the center part of the circle. A pivot shaft 27 to be pivotally mounted is disposed, and a pivot shaft 28 to which the lower end of the rear link 20 is pivotally mounted is provided at the rear portion of the base body 11.

  As shown in FIG. 3, two guide holes 29 and 30 as arc grooves in this embodiment are formed on the upper and lower sides of the rotating shaft 27 on which the front link 19 of the base body 11 is pivotally attached. Two moving shafts 31 and 32 guided by the upper and lower guide holes 29 and 30 are inserted into the base body 11. The guide holes 29 and 30 have a substantially arc shape centering on a rotation shaft 27 disposed in the center of the base body 11, and the upper guide hole 29 is a rotation shaft on which the front link 19 is pivotally attached. The lower guide hole 30 is disposed below the rotary shaft 27 on which the front link 19 is pivotally mounted. These guide holes 29 and 30 can slide-guide the moving shafts 31 and 32 inserted therein in the circumferential direction around the rotation shaft 27.

  As shown in FIG. 4, the two front links 19 are formed as a pair, and the front links 19 are arranged on the left and right sides of the base body 11 and are spaced apart from each other on the top and bottom of the base body 11. The two moving shafts 31 and 32 arranged in this manner protrude left and right of the base body 11, and come into contact with the moving shafts 31 and 32 when the front link 19 is rotated back and forth. ing.

  Further, in the base body 11 shown in FIG. 4, one leaf spring 33 as the first urging means and the second urging means in this embodiment is disposed. As shown in FIG. The leaf spring 33 has a substantially square shape in a side view, and is arranged so that the central bent portion is along the outer periphery of the rotating shaft 27, and the upper end of the leaf spring 33 is located above the base body 11. While being joined to the lower part of the moving shaft 31 as the first moving shaft in the embodiment, the lower end of the leaf spring 33 is disposed below the base body 11. The moving shaft as the second moving shaft in the present embodiment The upper part of 32 is joined. The leaf spring 33 can urge the upper moving shaft 31 and the lower moving shaft 32 in the vertical direction away from each other, and constitutes a first urging means and a second urging means with a simple structure. The number of parts used for the urging means can be reduced.

  Next, the front link 19 and the leaf spring 33 when the lower arm 6 is rotated will be described in detail with reference to FIGS. 3 and 5 to 7. FIG. 5 shows that the lower arm 6 is inclined slightly forward. FIG. 6 is a side view showing the base body 11 when the lower arm 6 is inclined to the front limit position, and FIG. It is a side view which shows the base body 11 when it inclines to this limit position, and demonstrates the right side of FIGS. 5-7 as the front below.

  As shown in FIG. 3, when the lower arm 6 is in a vertical state, the lower end of the front link 19 extending below the rotation shaft 27 is in contact with the lower movement shaft 32, and the upper movement shaft 31 is At this time, the substantially letter-shaped leaf spring 33 is kept in contact with the upper end of the guide hole 29.

  When the lower arm 6 is tilted slightly forward, the portion above the pivot shaft 27 of the front link 19 is in contact with the moving shaft 31 disposed above the base body 11 as shown in FIG. Touched. At this time, the lower moving shaft 32 is in the middle of the lower guide hole 30, but when the front link 19 is rotated, the moving shaft 32 comes into contact with the lower end of the lower guide hole 30 and the leaf spring 33 is moved upward. The upper moving shaft 31 urges the portion above the rotating shaft 27 of the front link 19 upward by the elasticity of the leaf spring 33. Therefore, the forward rotation of the front link 19 is suppressed.

  When the forward link 19 is further rotated forward, the upper moving shaft 31 is moved downward along the arc of the guide hole 29 and the leaf spring 33 is further bent as shown in FIG. The energizing power increases. When the lower arm 6 is tilted to the front tilt limit position, the moving shaft 31 with which the front link 19 abuts is brought into contact with the lower end of the upper guide hole 29, so that the lower arm 6 is rotated forward. The movement is stopped.

  As the lower arm 6 is tilted forward, the moment applied to the rotary shafts 27 and 28 to which the links 19 and 20 of the lower arm 6 are pivoted increases. However, the urging force of the leaf spring 33 becomes stronger as the leaf spring 33 is bent and deformed. Therefore, as the lower arm 6 approaches the forward tilt limit position from the vertical state, the urging force of the leaf spring 33 is increased. The force can counter the increase in the moment, and the lower arm 6 does not suddenly tilt while the liquid crystal display 4 is lowered, so that the liquid crystal display 4 does not drop suddenly.

  Further, when the liquid crystal display 4 is lifted, it becomes difficult to lift the liquid crystal display 4 due to the load applied thereto, but the leaf spring 33 is attached so that the front link 19 is rotated backward via the upper moving shaft 31. As a result, the lower arm 6 can easily be rotated backward, and the liquid crystal display 4 can be easily lifted.

  When the lower arm 6 in the vertical state shown in FIG. 3 is inclined rearward, the lower moving shaft 32 with which the lower portion of the front link 19 is in contact with the lower portion of the rotating shaft 27 is rotated by the rotation of the front link 19. Along with the movement, it is moved upward along the lower guide hole 30. The leaf spring 33 tries to rotate with the movement of the lower moving shaft 32, but the upper moving shaft 31 is in contact with the upper end of the guide hole 29, so that the rotation of the leaf spring 33 is restricted.

  Therefore, as shown in FIG. 7, when the front link 19 is rotated backward, the leaf spring 33 is pressed and bent from below along with the movement of the lower moving shaft 32, and this Due to the elasticity of the leaf spring 33, the lower moving shaft 32 to be abutted biases the portion below the rotating shaft 27 of the front link 19 in the direction of pushing back, so that the front link 19 Backward rotation is suppressed. When the lower arm 6 is tilted to the rear tilt limit position, the moving shaft 32 with which the front link 19 is in contact is brought into contact with the upper end of the lower guide hole 30, so that the lower arm 6 is moved rearward. The rotation is stopped.

  The lower arm 6 shown in FIG. 7 is not prepared by the load of the liquid crystal display 4 due to the elasticity of the tension spring 21 stretched between the two links 19 and 20 disposed inside. It is designed not to lean forward. When the lower arm 6 is tilted rearward, the lower arm 6 may suddenly tilt backward in the middle of the tilt due to the biasing force of the tension spring 21.

  However, since the lower moving shaft 32 presses the portion below the rotating shaft 27 of the front link 19 back by the elasticity of the leaf spring 33 arranged inside the base body 11, the front link The rearward rotation of 19 is suppressed. Further, as the lower arm 6 is tilted, the moment applied to the rotating shafts 27 and 28 pivotally attached to the base body 11 of the front link 19 increases, but as the front link 19 is tilted. Since the urging force of the leaf spring 33 is also increased, it is possible to counter the increase in the moment applied to the rotary shafts 27 and 28.

  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, one leaf spring constitutes the first urging means and the second urging means, but the present invention is not limited to this, and the urging means such as a coil spring. By providing two urging means corresponding to the respective upper and lower moving shafts, the upper and lower moving shafts may be elastically urged in directions away from each other.

  Further, in the above embodiment, the moving shaft with which the front link inside the lower arm is in contact is provided on the front side of the rotating shaft in the base body on which the front link is pivoted. It is not limited to this, You may provide in the back side of the rotating shaft in a base body.

  Furthermore, in the above embodiment, the front link inside the lower arm is brought into contact with the moving shaft and the rotation is suppressed. However, the present invention is not limited to this, and the rear link inside the lower arm. May be brought into contact with the moving shaft to urge the rotation.

  Furthermore, in the above-described embodiment, the parallel link type device support apparatus in which the upper arm and the lower arm are configured by two sets of parallel links via the joint portion has been described, but the parallel link type device support configured by only the lower arm is described. Needless to say, it can also be applied to devices.

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 side view which shows a base body when a lower arm is a vertical state. It is AA sectional drawing of the base body in FIG. It is a side view which shows a base body when a lower arm is inclined slightly ahead. It is a side view which shows a base body when a lower arm is inclined to the front limit position. It is a side view which shows a base body when a lower arm is inclined to the back limit position.

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 29, 30 Guide hole 31, 32 Moving shaft 33 Leaf spring

Claims (5)

  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. 1st movement which is a parallel link type apparatus support apparatus, Comprising: The range limited in the circumferential direction is moved on the circumference | surroundings around the rotating shaft by the side of the fixed side support body by which one link of the said parallel link is pivotally attached. A first urging means for elastically urging the first moving shaft is provided, and the one link is moved from a position where the one link is slightly inclined to a front inclination limit position. A parallel link type apparatus supporting device, wherein the forward rotation of the one link is suppressed by contacting the first moving shaft.   A second moving shaft that moves within a limited range in the circumferential direction is provided on the circumference around the rotating shaft, and second biasing means that elastically biases the second moving shaft is provided, 2. The backward rotation of the one link is suppressed when the one link abuts on the second moving shaft while the link is between a substantially vertical position and a rearward tilt limit position. Parallel link type equipment support device.   The first urging means and the second urging means are each constituted by a single leaf spring having a substantially square shape in side view, and each end of the leaf spring is respectively connected to the first moving shaft and the second movement. 3. The parallel link type apparatus support device according to claim 2, wherein the leaf spring is elastically biased so that the first moving shaft and the second moving shaft are spaced apart from each other in the circumferential direction.   The parallel link type apparatus support device according to claim 3, wherein the first movement axis and the second movement axis move in independent arc grooves.   The parallel link type device support device according to any one of claims 1 to 4, 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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