JP5261027B2 - Arm type support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress swelling of a base part of an arm part as much as possible and make an object of support precisely set at a desired position of a space, in an arm type supporting device for holding such an object as an illumination device and a display at a desired position in a space. <P>SOLUTION: One of the end parts of a tension spring 34 is coupled with a point near a tip of an arm part 10 supporting the object for support, one of the end parts of a wire 36 is coupled with the other end of the tension spring 34, an overhung member 16 is provided in the vicinity of the base part of the arm part 10, the other end of the wire 36 is coupled with the overhung member 16, a first pulley 32 is provided in free rotation at a site away from a support axis part 30 of a support part 28, and a middle point of the wire 36 is to be pulled with the first pulley 32. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an arm-type support device that supports an object such as a lighting device or a display near the tip of an arm portion and holds them at a desired position in a space.

  6 and 7 are explanatory views of a conventional arm type support device, FIG. 6 is an explanatory view when the arm portion is in an upright state, and FIG. 7 is an explanatory view when the arm portion is in an inclined state.

  As shown in these drawings, the arm-type support device generally includes an arm unit 10, an object (not shown) supported by a tip side portion of the arm unit 10, and a base side portion of the arm unit 10. And a tension spring 34 that supports the arm portion 10, and one end portion of the tension spring 34 is connected to a tip side portion of the arm portion 10. The other end is connected to a part of the support 24 that is slightly away from the rotation axis.

  In the arm-type support device, when the arm unit 10 is inclined, a force that causes the arm unit 10 to fall down due to the load of the object and the arm unit 10 acts on the arm unit 10. Here, when a force having the same magnitude as that of the force for defeating the arm portion 10 is applied to the arm portion 10 in the reverse direction using the tension spring 34, the force for defeating the arm portion 10 is applied to the tension spring 34. The arm part 10 is not collapsed by the load of the object and the arm part 10 due to the cancellation by the force.

  By the way, in the arm-type support device, the force to fall the arm unit 10 by the load of the object and the arm unit 10 is small while the tilt angle of the arm unit 10 is small, and suddenly increases when the tilt angle of the arm unit 10 increases. Become bigger.

  Therefore, it is preferable that the force of the tension spring 34 supporting the arm unit 10 is small while the tilt angle of the arm unit 10 is small, and is rapidly increased when the tilt angle of the arm unit 10 is large.

  When the force of the tension spring 34 that supports the arm portion 10 is not so, that is, when the tension spring 34 is too strong or too weak, when the arm portion 10 is tilted, the arm portion 10 returns or the arm The part 10 falls too much, and the object cannot be stopped at a desired position in the space. Conventional arm-type support devices tend to have such a tendency, although there are differences in degree.

  Therefore, the conventional arm-type support device can tighten the rotating portion of the base portion of the arm portion 10 so as not to cause such inconvenience, and gives a certain frictional force to the rotating portion according to the degree of tightening. Even if 34 is too strong or too weak, the base portion of the arm portion 10 is pressed by this frictional force so that the object supported by the arm portion 10 stops at that position in the space.

  However, even if the rotation portion of the base portion of the arm portion 10 can be tightened, the frictional force of the rotation portion gradually decreases while the arm portion 10 is moved. Therefore, when the arm portion 10 is tilted, the arm portion 10 Or the arm part 10 falls too much, so that the object cannot be stopped at a desired position in the space.

  For this reason, when the arm portion 10 becomes such a state, the rotating portion is tightened again to increase the frictional force of the rotating portion, and when the arm portion 10 is tilted, the arm portion 10 returns or the arm portion 10 I try not to fall too much.

  However, every time the arm portion 10 becomes such, it is very troublesome for a person handling this arm type support device to tighten the rotating portion with an appropriate strength and increase the frictional force of the rotating portion appropriately. .

  Accordingly, the force of the tension spring 34 supporting the arm unit 10 is small while the tilt angle of the arm unit 10 is small, and increases rapidly when the tilt angle of the arm unit 10 is large. When separated, it is preferable that the arm portion 10 has a desired angle without depending on the frictional force of the rotating portion, and the object stops at a desired position in the space.

  In order to make the force of the tension spring 34 supporting the arm portion 10 small when the tilt angle of the arm portion 10 is small and rapidly increase as the tilt angle of the arm portion 10 increases, a tension spring that is not too strong is used. It is necessary to increase the elongation rate of the tension spring 34 per tilt angle of the arm portion 10 as much as possible.

  In the conventional arm type support device, in order to maximize the elongation rate of the tension spring 34 per tilt angle of the arm portion 10, one end of the tension spring 34 is fixed on the arm portion 10, and the other end of the tension spring 34 is connected to the other end. What is necessary is just to fix to the position as far as possible from a rotating shaft.

However, if it does so, the part which fixed the other end of the tension spring 34 will protrude outside from the base part of the arm part 10, and will have the inconvenience that the base part of the arm part 10 cannot be formed compactly. . Therefore, it is preferable to increase the elongation rate of the tension spring 34 per tilt angle of the arm portion 10 without the portion where the other end of the tension spring 34 is fixed projecting greatly from the arm portion 10.
JP 2000-138008 A JP 2001-35242 A JP 2003-59333 A

  The problem to be solved by the present invention is to increase the elongation rate of the tension spring 34 per tilt angle of the arm portion 10 as much as possible in the arm type support device so that the object stops at the adjusted spatial position. Then, the portion where the other end of the tension spring 34 is fixed must be separated from the base portion of the arm portion 10 as much as possible, and the base portion of the arm portion 10 cannot be compactly formed.

  The present invention increases the elongation per tilt angle of the tension spring so that the object is placed in the adjusted spatial position in a state where the portion where the other end of the tension spring is fixed does not protrude as far as possible from the base of the arm portion. In order to stop tightly, a pulley is provided on the support part that supports the arm part in a tiltable manner, a wire is connected to the end part of the tension spring, and the end part of the wire is connected to the arm part via an extension member. The most important feature is that the pulley is pulled in the middle of the wire.

  That is, according to the present invention, one end portion is connected to an arm portion that supports an object, a support body that tiltably supports a portion on the base portion side of the arm portion, and a tip side portion of the arm portion. And a tension spring having the other end extending to the base side of the arm, and a wire having one end connected to the other end of the tension spring.

  Here, examples of the object include a lighting device and a display. However, as long as the object needs to be held at a desired position in the space, an object other than these may be supported by the arm unit. .

  In addition, the arm portion includes an overhang member in the middle, and the support includes a base portion that is in contact with the installation location, a support portion that is integrally provided on the base portion, and a support portion on the base side of the arm. A support shaft to which the portion is tiltably mounted, and a first pulley that is rotatably provided at a portion of the support portion away from the support shaft.

  Further, the arm portion and the support shaft are in a substantially right-angle spatial relationship, the shaft of the first pulley is parallel to the shaft of the support shaft, and the other end of the wire is the overhang Connected to the member, the middle of the wire is folded back to the circumferential groove of the first pulley and engaged in a pulled state.

  Further, a second pulley may be provided in the vicinity of the base inside the arm portion in a state where the shaft is parallel to the shaft of the first pulley, and the middle of the wire may be engaged with the second pulley.

  According to the present invention, the elongation rate of the tension spring is increased with respect to the inclination angle of the arm portion, and the tension force of the tension spring with respect to the inclination angle of the arm portion is small as the inclination angle of the arm portion is small. It becomes possible to make it suddenly increase as the tilt angle increases, and accordingly, the protruding length from the support part of the part that pulls the tension spring can be designed to be short, and the periphery of the support part is compactly formed. There is an effect that can be.

  According to the present invention, in the case where the second pulley is provided in the vicinity of the base inside the arm portion in a state where the shaft is parallel to the shaft of the first pulley, the middle of the wire is engaged with the second pulley. Thus, there is an effect that it is possible to make a compact arm-type support device in which a tension spring is inserted inside the arm portion.

  In addition, according to the present invention, a mechanism is employed in which a spring serving as a force source for holding the arm is installed in parallel with the arm, and the amount of change in the spring length is obtained by changing the direction of the force with a wire. As a result, the force generated by the spring can be made closer to the load that changes depending on the tilt angle of the arm, and the effect of increasing the staticity after moving the arm is obtained.

  Moreover, according to this invention, there exists an effect that the arm which supports an illuminating device and a display can be moved smoothly.

  Further, according to the present invention, since the amount of contraction of the spring is made efficient by the wire folding mechanism, the periphery of the base portion supporting the arm can be compactly formed when producing a product under the same conditions as the conventional product. There is an effect.

  In addition, according to the present invention, since the ratio depending on the tightening (friction) of the shaft portion is reduced, there is an effect that the assemblability and durability are improved.

  In addition, according to the present invention, the spring force can be extracted more efficiently, so the number of parts is reduced from the use of two springs to one, the weight of the product is reduced, the assembly is improved, This contributes to cost reduction, and even if a weaker spring is used, the same performance can be exhibited, which contributes to an improvement in assemblability.

  Further, according to the present invention, since the tension spring can be installed in parallel with the arm, the spring can be stored inside the arm, and the arm can be formed compactly.

  In the arm type support device, the extension of the tension spring per tilt angle of the arm part is made as long as possible so that the lighting device and the display can be stopped tightly in the spatial position adjusted by the user. Thus, overhanging of the base of the arm part to the side was realized with as little as possible.

  1 and 2 are explanatory views of the arm type support device according to the present invention, FIG. 3 is an enlarged perspective view of the vicinity of the base portion of the arm portion of the arm type support device according to the present invention, and FIG. FIG. 2 is an explanatory diagram of the arm type support device when the arm portion is in an inclined state.

  In these drawings, reference numeral 10 denotes an arm portion, and an illumination device (not shown) is attached to a portion on the distal end side (upper side in these drawings) of the arm portion 10 via an auxiliary arm portion 12. The arm portion 10 is composed of a pair of parallel metal bar members 14 and 14 facing each other at a predetermined interval, and a pair projecting sideways at the base side (lower side of these drawings) of the arm portion 10. The plate-like projecting members 16 and 16 are provided in parallel at a predetermined interval, and a fixing pin 18 connects the upper part of the projecting members 16 and 16 to the upper part of the projecting members 16 and 16. Is provided.

  The auxiliary arm portion 12 has a structure in which a pair of parallel metal bars 20, 20 facing each other at a predetermined interval are connected in a substantially parallelogram shape and supported by an auxiliary tension spring 22. . Although the lighting device which is a support object is attached to the arm unit 10 via the auxiliary arm unit 12, the lighting device may be directly attached to a portion on the distal end side of the arm unit 10. A fluorescent lamp or LED is attached to the light emitting portion of the illuminating device, and these fluorescent lamp or LED is connected to a power supply device (not shown) via an electric wire.

  A support 24 that supports the arm unit 10 is provided on the base side of the arm unit 10. The support 24 includes a base 26 having a large area that can be placed on an installation place such as a table, and a support 28 provided integrally on the base 26. The support portion 28 is provided with a support shaft 30 that supports the lower portion of the arm portion 10 so that the lower portion of the arm portion 10 can tilt, and a first pulley whose shaft is parallel to the support shaft 30 is located above the support shaft 30 and close to the arm portion 10. 32 is provided integrally with the support portion 28 so as to be rotatable.

  In the embodiment shown in FIG. 3, the base 26 of the support 24 has a large area that can be placed on a setting place such as a table. However, the base 26 is not limited to such a large area. As in the embodiment shown in FIG. 2, the support 24 may be clamped to the edge of a table or the like. The arm portion 10 and the support shaft 30 are in a substantially right-angled spatial relationship, and overhang members 16, 16 provided on the base portion side of the arm portion 10 can be tilted via the support shaft 30 in the support portion 28. It is attached.

  A tension spring 34 is accommodated between the metal rods 14 and 14 of the arm portion 10, and one end portion of the tension spring 34 is connected to a tip side portion of the arm portion 10, and the other end portion is connected. It extends to the base side of the arm part 10. One end of the wire 36 is connected to the other end of the tension spring 34, and the other end of the wire 36 is connected to the fixing pin 18 of the extension members 16 and 16. The middle of the wire 36 is folded back by the circumferential groove of the first pulley 32 and engaged with the circumferential groove of the first pulley 32 in a pulled state.

  A second pulley 38 is provided in the vicinity of the base portion of the arm portion 10 in a state where the shaft is parallel to the shaft of the first pulley 32, and the middle of the wire 36 is engaged with the second pulley 38 and the tension spring 34. Is held inside the arm portion 10 by the second pulley 38, and the wire 36 is bent by the second pulley 38, exits from the arm portion 10, engages with the first pulley 32, and is connected to the fixing pin 18. Yes.

  In the above embodiment, the tension spring 34 inside the arm portion is visible, but the arm portion 10 may be covered with a metal plate so that the tension spring 34 is not visible.

Next, regarding the arm type illumination device according to the present invention, the positional relationship between the first pulley 32 and the second pulley 38 and the positional relationship between the first pulley 32 and the fixing pin 18 when the arm portion 10 is tilted are tilted. When the angles were 0, +50, and -30 degrees, the results were as shown in FIG. In this case, the distance L ₁ between the first pulley 32 and the second pulley 38 and the distance L ₂ between the first pulley 32 and the fixing pin 18 were examined. As shown in Table 1. there were.

As shown in Table 1, when the tilt angle of the arm portion 10 is tilted from 0 degree to +50 degrees and −30 degrees, both the distance L ₁ and the distance L ₂ become longer than when the tilt angle is 0 degree, Assuming that the end of the wire is fixed by the first pulley as an example of a conventional arm type support device, the arm type support device of the present invention is tilted to the same extent as the conventional arm type support device. It can be seen that the tension spring 34 is stretched approximately twice as much as the angle, and therefore a tension force of approximately twice occurs at the same tilt angle.

  Next, regarding the arm-type support device according to the present invention and the conventional arm-type support device, the force generated by the support object and the arm portion 10 caused by the load of the arm portion 10 and the arm generated by the tensile force of the tension spring When the force for supporting the portion 10 was obtained, it was as shown in the graph of FIG.

  From this graph, the conventional arm-type lighting device tries to tilt the arm portion 10 generated by the load of the support object and the arm portion 10 against the force that supports the arm portion 10 generated by the tensile force of the tension spring. Since the force is quite large, it is difficult to make the arm unit 10 standstill only by the frictional force of the support unit 28 when the arm unit 10 is moved, and the arm unit 10 is likely to fall down when the arm unit 10 is moved. I understand.

  On the other hand, the arm-type support device according to the present invention tilts the arm portion 10 generated by the load of the support object and the arm portion 10 against the force for supporting the arm portion 10 generated by the tensile force of the tension spring. Therefore, it can be seen that when the arm portion 10 is moved, it is relatively easy to make the arm portion 10 stand still only by the frictional force of the support portion 28.

  The arm-type support device of the present invention is not limited to a device that supports a lighting device or a display attached to the vicinity of the tip of the arm portion, but can be used for any device that holds other objects at predetermined positions in the space. Of course you can.

It is explanatory drawing of the arm type | mold support apparatus (when an arm part is an upright state) which concerns on this invention. It is explanatory drawing of the arm-type support apparatus (when an arm part is an inclination state) which concerns on this invention. It is an expansion perspective view of the base part vicinity of the arm part of the arm type | mold support apparatus which concerns on this invention. It is explanatory drawing which shows the positional relationship of a 1st pulley and a 2nd pulley at the time of tilting an arm part, and the positional relationship of a 1st pulley and a fixed pin. It is a graph which shows the relationship between the force which tries to fall down the arm part which arises with a load in an arm type illuminating device, and the force which tries to support the arm part which arises by the tensile force of a spring. It is explanatory drawing of the conventional arm type support apparatus (when an arm part is an upright state). It is explanatory drawing of the conventional arm type support apparatus (when an arm part is an inclination state).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Arm part 12 Auxiliary arm part 14 Bar 16 Overhang member 18 Fixing pin 20 Bar 22 Auxiliary tension spring 24 Support body 26 Base 28 Support part 30 Support shaft 32 First pulley 34 Pull spring 36 Wire 38 Second pulley

Claims (3)

An arm for supporting an object; a support for supporting a base side portion of the arm so as to be tiltable; a tension spring for pulling and supporting the distal end of the arm; and a wire coupled to the tension spring The arm portion includes a projecting member in the vicinity of the base portion, and the support includes a base portion in contact with the installation place, a support portion integrally provided on the base portion, and the arm portion on the support portion. And a first pulley rotatably provided at a portion of the support portion away from the support shaft. The arm portion and the support shaft are substantially the same. The first pulley shaft is parallel to the support shaft shaft, and one end portion of the tension spring is connected to the distal end portion of the arm portion. The other end of the spring extends to the base side of the arm, and one end of the wire Is connected to the other end portion of the tension spring, and the middle of the wire is folded back while being pulled by the circumferential groove of the first pulley, and the other end portion of the wire is connected to the extension member. The arm-type support device is connected to an upper portion of the first pulley, and the wire is housed in a projecting range of the projecting member . A second pulley is provided in the vicinity of the base portion of the arm portion in a state where the second pulley is close to the arm portion and a shaft is parallel to the shaft of the first pulley, and the middle of the wire is engaged with the second pulley. The arm-type support device according to claim 1, wherein: The arm type support device according to claim 1, wherein the object is a lighting device or a display .

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