JPH11125393A - Arm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of uncomfortable slide sound for a user, by preventing contact sliding between an arm body and an energizing spring body received in this arm body. SOLUTION: In this device, in a pipe-shaped upper part first arm 13 (arm body), a resin cylinder 13a (low friction body) is inserted, in this resin cylinder 13a, a compression spring 45 (energizing spring body) is inserted, an arm device is assembled. By turning this arm device, even when the compression spring 45 is compressed, this compression spring 45 is prevented from being slid by direct contact with an inner surface of the first arm 13, generation of a slide sound can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arm device used for a desk lamp, a document table, a telephone table, and the like, and more particularly to a device having an urging spring.

[0002]

Conventionally, this type of arm device is employed in an arm device using a parallel crank mechanism of a mounting table such as a desk lamp, a document, and a telephone.
The rotation of these arm devices can be adjusted to an arbitrary angle, and a lamp, a mounting table, and the like provided at the tip of the arm device can be set to an arbitrary direction and height. In order to hold the arm device at an arbitrary angle against the weight of the arm device itself, the lamp, the mounting table, and the weight of the original, telephone, etc. to be mounted, for example, Japanese Patent Publication No. 54-4183.
As described in, for example, Japanese Patent Application Laid-Open No. 6-205, there is known a spring in which an urging spring such as a tension spring is housed in an arm body (tubular member). However, in these conventional arm devices, since the biasing spring is provided inside the arm body, when the arm device is moved to expand and contract the biasing spring, the biasing spring contacts and slides on the inner surface of the arm body. In addition, there is a possibility that a sliding sound that is uncomfortable for the user may be generated. In order to prevent this sliding noise, for example, it is conceivable to apply lubricating oil such as grease to the biasing spring and incorporate it into the arm body. However, as the grease is used, the grease moves inside the biasing spring. However, there is a possibility that a sliding noise is generated.

An object of the present invention is to solve the above problems and to provide an arm device capable of suppressing generation of sliding noise.

[0004]

According to the present invention, there is provided an arm device having a tubular arm body and an urging spring provided inside the arm, wherein an inner surface of the arm and the urging spring are provided. A low friction body is interposed between them.

According to the present invention, the urging spring portion expands and contracts when the arm device is moved, and a low friction member is formed between the urging spring portion and the inner surface of the arm. The two slide in contact with each other via the low friction body.

According to the present invention, the low-friction body is made of resin, and is inserted between the arm body and the biasing spring portion.

According to the present invention, a low friction member made of resin separate from the arm is inserted into the inside of the tubular arm, and a biasing spring is provided inside the low friction. Insert the part to assemble the arm device.

Further, in the present invention, the low friction body is made of resin, and is formed by covering an inner surface of the arm body.

According to the present invention, an arm device is assembled by inserting a biasing spring portion into a tubular arm body whose inner surface is previously coated with a low friction material made of resin.

In the present invention, the low-friction body is made of resin, and is formed by covering a surface of the biasing spring portion.

According to the present invention, an arm device is assembled by inserting a biasing spring portion whose surface is previously coated with a low friction material made of resin into a tubular arm body.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, an arm device of a desk lamp having a parallel crank mechanism is taken as an example of an article having an arm device.

Reference numeral 1 denotes a lower parallel crank mechanism. As shown in FIG. 2, the lower parallel crank mechanism 1 includes a hollow lower first arm 3 and a hollow lower second
The base ends of the arms 4 are pivotally supported, respectively, and the distal ends of the lower first arm 3 and the lower second arm 4 are connected to the second hinge body 5 by connecting shafts 6 and 7 (shown in FIG. 1 and the like). It is configured to be rotatably supported. The lower first arm 3 and the lower second arm 4 are formed to have the same length, and are respectively attached in parallel. On the base end side of the lower second arm 4, a rod 8 serving as a projection is fixed perpendicular to the lower second arm 4 and protrudes toward the lower first arm 3. The rod 8 constitutes an urging structure (not shown for the lower parallel crank mechanism 1) described later. Further, a clamp 9 for fixing to a desk or the like is attached to a lower portion of the first hinge body 2.

Reference numeral 11 denotes an upper parallel crank mechanism. In the upper parallel crank mechanism 11, the base ends of the hollow upper first arm 13 and the hollow upper second arm 14 are rotated by the connecting shafts 15 and 16 (shown in FIG. 1 and the like) on the second hinge body 5. The distal ends of the upper first arm 13 and the upper second arm 14 are connected to the third hinge body 17 by connecting shafts.
It is constituted by being pivotably supported by 18, 19 (shown in FIG. 1 and the like). The upper first arm 13 and the upper second arm 14 are formed to have the same length, and are respectively attached in parallel. In addition, the upper second
At the base end side of the arm 14, a rod 20 as a projection is fixed. The rod 20 is fixed perpendicular to the upper second arm 14 and protruding toward the upper first arm 13. The rod 20 constitutes an urging structure described later.

Reference numeral 21 denotes a lamp. This lamp 21 is particularly shown in FIG.
As shown in the figure, a mounting bracket 22 mounted on the third hinge body 17, a horizontal rotating shaft 23 mounted on the mounting bracket 22, and a vertically rotatable centering on the horizontal rotating shaft 23. A connecting member 24 whose base end side is pivotally supported, a torsion coil spring 25 for urging the connecting member 24 upward, and a lamp body 26
And the lamp body 26 perpendicular to the axial direction of the connecting member 24 and the horizontal rotation axis 23 with respect to the distal end side of the connecting member 24.
And an orthogonal rotation shaft 27 that rotatably supports. A light source 29 such as a fluorescent lamp is detachably attached to the back of the shade 28 of the lamp body 26. In addition, a circuit board 30 such as an inverter circuit for lighting the light source 29 is attached inside the lamp body 26.

Next, the urging structure will be described with reference to FIG. Although this urging structure is formed in each of the lower parallel crank mechanism 1 and the upper crank mechanism 11, since the structures of both urging structures are the same, the urging structure of the upper crank mechanism 11 will be described. The description of the biasing structure of the lower parallel crank mechanism 1 will be omitted. On the base end side of the upper first arm 13, a through groove 41 is formed on the upper second arm 14 side in parallel with the axial direction of both arms 13, 14. A retaining member 42 is attached to the distal end side of the upper first arm 13, and a connecting member 43 pivotally supported by the third hinge body 17 is attached.
The retaining member 42 and the connecting member 43 are fixed to the upper first arm 13 by screws 44. In the upper first arm 13, a resin cylinder 13a as a low friction body is accommodated, and a compression spring 45 as an urging spring is accommodated in the resin cylinder 13a. The retaining member
It is in contact with 42. A sliding body 46 is accommodated in the upper first arm 13 so as to be slidable in the axial direction, and the other end of the compression spring 45 is in contact with the sliding body 46. A guide portion 47 guided by the through groove 41 is provided on the sliding body 46.
The rod 20 is slidably inserted into the guide portion 47 and an insertion hole 48 serving as an engagement receiving portion.
Are drilled. Further, a connecting member 49 also serving as a retaining member is attached to the base end side of the upper first arm 13 with a screw 50. The connecting member 49 is connected to the second
The compression spring 45 and the sliding body 46 are pivotally supported by the hinge body 5 together with the retaining member 42 and are connected to the upper first arm 13.
It is sealed inside. The biasing structure is thus configured.

A connecting member 52 having a through hole 51 for wiring is attached to each end of the upper second arm 14 with a screw 53. These connecting members 52
Are pivotally supported by the second hinge body 5 and the third hinge body 17, respectively. Although not shown, the lamp
The wiring to 21 passes through the upper second arm 14 and the connecting member 52.

Next, the assembly of the upper parallel crank mechanism 11 including the urging structure will be described. Although the description is omitted, the lower parallel crank mechanism 1 is assembled in a similar manner. First, the retaining member 42 is fixed to the distal end side of the upper first arm 13, and the connecting member 43 is further fixed. Next, the resin tube 13a is inserted from the base end side of the upper first arm 13, and the compression spring 45 is further inserted into the resin tube 13a. After the compression spring 45 is inserted into the upper first arm 13 and the resin tube 13a, the compression spring 45 is compressed while the upper first arm 13 is compressed.
The sliding body 46 is inserted from the base end side. At this time, the sliding member 46 is inserted so that the guide portion 47 is guided by the through groove 41 of the upper first arm 13. Thereby, the sliding body including the insertion hole 48
The 46 can be oriented correctly and the assembly work can be done easily.
After inserting the sliding body 46 into the upper first arm 13, the connecting member 49 is fixed to the base end side of the upper first arm 13. Thereby, the upper first arm 13 side of the biasing structure is assembled. In this state, the compression spring 45 is sandwiched between the retaining member 42 and the sliding member 46 in a compressed state, and elastically deforms and expands and contracts as the sliding member 46 slides. Further, the upper first arm 13 and the upper second arm 14 are made parallel to each other, and a projection 20 having a base end fixed to the upper second arm 14.
Of the arm 13 into the insertion hole 48 of the sliding body 46,
The connecting members 49 and 52 fixed to the base ends of the arms 13 and 14 are pivotally supported on the second hinge body 5 so as to be vertically rotatable. By pivotally connecting the connecting members 43 and 52 fixed to the third hinge body 17 so as to be rotatable in the vertical direction, the urging structure and the upper parallel crank mechanism 11 are assembled.

Next, the operation of the above configuration will be described. Note that, similarly to the description of the structure, the operation of the biasing structure of the upper parallel crank mechanism 11 will be described, and the description of the operation of the biasing structure of the lower parallel crank mechanism 1 will be omitted. When the upper parallel crank mechanism 11 is rotated about the connecting shafts 15 and 16, the upper first arm 13 and the upper second arm 14 are displaced from each other while maintaining a parallel state. Since the rod body 20 of the upper second arm 14 is inserted into the insertion hole 48 of the sliding body 46, the sliding body 46 is guided by the through groove 41 following the rotation of the upper parallel crank mechanism 11, and The first arm 13 slides toward its distal end. As a result, the compression spring 45 is compressed, so that the sliding body
An elastic force (restoring force) on the base end side of the upper first arm 13 is applied to 46. That is, an elastic force is applied in the direction in which the compression spring 45 expands, and the upper parallel crank mechanism 11 is urged upward. This allows the upper parallel crank mechanism to resist the weight of the upper parallel crank mechanism 11 and the weight of the lamp 21.
11 is held at any angle. At this time, the compression spring
The compression or extension of 45 causes the compression spring 45 to slide in contact with the inner surface of the resin cylinder 13a.
The generation of unpleasant sliding noise can be kept very small.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In this embodiment, the upper first arm 13
A resin layer 13b serving as a low friction body is formed by covering the inner surface of the first embodiment, and a compression spring 45 serving as an urging spring is housed in the resin layer 13b. I have.

Next, the assembly of the upper parallel crank mechanism 11 including the urging structure will be described. First, the retaining member 42 is fixed to the distal end side of the upper first arm 13 whose inner surface is covered with the resin layer 13b, and the connecting member 43 is further fixed. Next, the compression spring 45 is inserted from the base end side of the upper first arm 13. After the compression spring 45 is inserted into the upper first arm 13, the sliding body 46 is inserted from the base end side of the upper first arm 13 while compressing the compression spring 45. Slide the sliding body 46 to the upper first arm 13
After the insertion, the connecting member 49 is fixed to the base end side of the upper first arm 13. Thereby, the upper first arm 13 side of the biasing structure is assembled. Hereinafter, the description is omitted because it is common to the first embodiment.

Next, the operation of the above configuration will be described. The operation of the biasing structure of the upper parallel crank mechanism 11 will be described in the same manner as in the first embodiment, and the description of the operation of the biasing structure of the lower parallel crank mechanism 1 will be omitted. When the upper parallel crank mechanism 11 is rotated about the connecting shafts 15 and 16, the upper first arm 13 and the upper second arm 14 are displaced from each other while maintaining a parallel state. Since the rod body 20 of the upper second arm 14 is inserted into the insertion hole 48 of the sliding body 46, the sliding body 46 is guided by the through groove 41 following the rotation of the upper parallel crank mechanism 11, and The first arm 13 slides toward its distal end. As a result, the compression spring 45 is compressed, so that the sliding body
An elastic force (restoring force) on the base end side of the upper first arm 13 is applied to 46. That is, an elastic force is applied in the direction in which the compression spring 45 expands, and the upper parallel crank mechanism 11 is urged upward. This allows the upper parallel crank mechanism to resist the weight of the upper parallel crank mechanism 11 and the weight of the lamp 21.
11 is held at any angle. At this time, the compression spring
The compression spring 45 expands the compression spring 45 so that the upper first arm
It slides in contact with the resin layer 13b formed on the inner surface of 13,
Since sliding occurs between the resin and the metal, generation of unpleasant sliding noise can be suppressed to a very small level.

Next, a third embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In this embodiment, the surface of the compression spring 45 as an urging spring is formed by coating a resin layer 45a as a low-friction body, except that the compression spring 45 is housed in the upper first arm 13. , And are common to the first and second embodiments.

Next, the assembly of the upper parallel crank mechanism 11 including the urging structure will be described. First, the upper first
The retaining member 42 is fixed to the distal end side of the arm 13, and the connecting member 43 is further fixed. Next, a compression spring 45 whose surface is covered with a resin layer 45a is inserted from the base end side of the upper first arm 13. After the compression spring 45 is inserted into the upper first arm 13, the sliding body 46 is inserted from the base end side of the upper first arm 13 while compressing the compression spring 45. Slide the sliding body 46 to the upper first arm 13
After the insertion, the connecting member 49 is fixed to the base end side of the upper first arm 13. Thereby, the upper first arm 13 side of the biasing structure is assembled. Hereinafter, the description is omitted because it is common to the first embodiment.

Next, the operation of the above configuration will be described. The operation of the biasing structure of the upper parallel crank mechanism 11 will be described in the same manner as in the first embodiment, and the description of the operation of the biasing structure of the lower parallel crank mechanism 1 will be omitted. When the upper parallel crank mechanism 11 is rotated about the connecting shafts 15 and 16, the upper first arm 13 and the upper second arm 14 are displaced from each other while maintaining a parallel state. Since the rod body 20 of the upper second arm 14 is inserted into the insertion hole 48 of the sliding body 46, the sliding body 46 is guided by the through groove 41 following the rotation of the upper parallel crank mechanism 11, and The first arm 13 slides toward its distal end. As a result, the compression spring 45 is compressed, so that the sliding body
An elastic force (restoring force) on the base end side of the upper first arm 13 is applied to 46. That is, an elastic force is applied in the direction in which the compression spring 45 expands, and the upper parallel crank mechanism 11 is urged upward. This allows the upper parallel crank mechanism to resist the weight of the upper parallel crank mechanism 11 and the weight of the lamp 21.
11 is held at any angle. At this time, the compression spring
The compression spring 45 whose surface is covered with the resin layer 45a by the compression or expansion of the 45 slides in contact with the inner surface of the upper first arm 13, but slides between the resin and the metal, so that an unpleasant sliding sound is generated. Can be kept very small.

As described above, according to each of the above embodiments, a low friction member such as the resin cylinder 13a and the resin layers 13b and 45a is formed in the upper first arm 13, and the compression spring 45 is formed in the solid resin layer. The upper first arm 13 due to the expansion and contraction of the compression spring 45.
The sliding contact between the inner surface of the spring and the compression spring 45 can be prevented, and the generation of unpleasant sliding noise can be minimized.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the claims. For example, although the resin cylinder 13a is formed in a cylindrical shape, it may be formed by winding a resin film or the like. Further, the low-friction body is provided with the compression spring
Since it is only necessary to prevent the contact of the upper 45 with the inner surface of the upper first arm 13, it is not necessary to form the upper surface 45 over the entire inner surface of the upper first arm 13. For example, a low-friction body is shown in FIG.
As shown in the figure, the resin layer 13c is partially cut out,
As shown in FIG. 6, a resin layer 13d is formed on the inner surface of the upper first arm 13.
May not be formed.

[0028]

According to the present invention, even if the biasing spring portion expands and contracts by moving the arm, the present invention does not make direct contact with the inner surface of the arm body, so that the sliding noise is extremely small. An arm device that can be suppressed and does not cause discomfort during use can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a side view showing one embodiment of the present invention.

FIG. 3 is an axial sectional view of a main part showing one embodiment of the present invention.

FIG. 4 is an axial sectional view of a main part showing another embodiment of the present invention.

FIG. 5 is an axial sectional view of a main part showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view in a direction perpendicular to an axis of a main part showing another embodiment of the present invention.

FIG. 7 is a sectional view in a direction perpendicular to an axis of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 13 Upper first arm (arm body) 13a Resin cylinder (low friction body) 13b, 13c, 13d Resin layer (low friction body) 45 Compression spring (biasing spring portion) 45a Resin layer (low friction body)

Claims (4)

[Claims] 1. An arm device having a tubular arm body and an urging spring provided inside the arm, wherein a low friction member is interposed between an inner surface of the arm and the urging spring. An arm device characterized by having 2. The arm device according to claim 1, wherein the low friction body is made of a resin layer, and is inserted between the arm body and the urging spring. 3. The arm device according to claim 1, wherein said low friction body is made of a resin layer and is formed by covering an inner surface of said arm body. 4. The arm device according to claim 1, wherein the low friction body is made of a resin layer and is formed so as to cover a surface of the biasing spring portion.