JP3008932U - Friction stop mechanism for telescopic support - Google Patents

Abstract

(57) [Abstract] [Purpose] To suppress the rattling of the fitting in the stretched state in a stretchable strut configuration in which a thin strut and a thick cylindrical strut are fitted together. [Structure] A guide member 7 is attached to a thin column 6. The guide member 7 is formed with a friction portion 7b and a foot portion 7c which are brought into contact with the inner wall surface 5a of the thick support 5 by elastic force. An adjusting member 8 is attached to the thin column 6,
By the rotation, the foot portion 7c can be pushed and the tip can be adjusted to a position close to the inner wall surface 5a. As a result, it becomes possible to suppress rattling between the support columns in the extended state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a friction stop mechanism suitable for a stretchable support, particularly a support for an overhead projector that supports a projection lens and a support for a document image input device that supports a CCD camera.

[0002]

[Prior art]

 First, an outline of a material image input device most suitable for using the present invention will be described with reference to FIG. A column 2 rotatably attached to the base 1 is composed of three columns 2a, 2b and 2c having different thicknesses, and a CCD camera 3c is attached to the tip of the column 2c. Also, two light sources 4 for photographing a document or the like by reflected light are attached to the main body 1. A light source for photographing a film original or the like by transmitted light is arranged inside the material mounting surface 1a of the main body 1.

Such a device is portable and the CCD camera 3 is relatively small and lightweight. Therefore, in the extended state as shown in the drawing, the support 2 does not rely on screws or clicks between the supports 2a and 2b and between the supports 2b and 2c. However, the state is maintained only by the frictional force. The friction member that gives friction between the two columns is usually provided on the thin column because its assembly work is easy, and at the end of the thin column to increase the expansion and contraction efficiency of both columns. ing.

[0004]

[Problems to be solved by the device]

 However, in the conventional strut structure as described above, there is a considerable dimensional difference between the outer shape of the thin strut and the in-cylinder shape of the thick strut in terms of design and manufacture. This is unavoidable to some extent because of the interposition of friction members. However, if the dimensional difference becomes larger than the specified value due to processing error, etc., the thin support becomes extremely unstable with respect to the thick support in the extended state. That is, in FIG. 6, for example, rattling occurs in the direction in which the weight of the CCD camera 3 is applied and in the opposite direction. This not only makes the position of the CCD camera 3 unstable, but also causes damage to the support structure due to repeated expansion and contraction operations of the support columns.

The present invention has been made in order to solve such a problem, and an object of the present invention is to use a guide member having a special structure having a friction portion so that a thin strut in an extended state can be obtained. To provide a friction stopping mechanism in an expandable / contractible strut that suppresses rattling of fitting between a thick strut and a thick strut.

[0006]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, the friction stop mechanism of the expandable strut of the present invention is such that the thin strut is fitted to the inner wall surface of the thick strut so that the stretched state of both strut can be maintained by friction. In the flexible column, it is slidably attached to the outer surface of the thin column with the inner wall surface of the thick column, and is attached elastically to the inner wall surface of the thick column on one side in the longitudinal direction of the thin column with the attachment part in between. A guide member that is in contact with each other and that holds the extended state of both columns is formed, and on the other side is a guide member that has a foot with elastic deformation force, and is attached rotatably to the outer surface of the thin column. The adjusting member is capable of deforming the foot portion in the direction of the inner wall of the thick strut against the elastic force by a desired amount.

[0007] Preferably, in the friction stop mechanism of the telescopic column of the present invention, the thin column is a square column, and the guide members are two pieces so as to cover two adjacent corners of the thin column. The friction portion is provided so as to project in the longitudinal direction from the end portion of the thin strut, and elastically engages with the inner wall surface of the thick strut at two ends on both sides in a direction substantially orthogonal to the longitudinal direction.

[0008]

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 is a perspective explanatory view, FIG. 2 is a partial sectional side view, and FIG. 3 is a sectional view taken along line AA of FIG. 4 and 5 are cross-sectional views showing modified examples viewed from the same cross section as FIG. 3, respectively.

First, the configuration of the embodiment will be described with reference to FIGS. 1 to 3. The thick pillar 5 having a quadrangular cross section has a tubular shape, and has four inner wall surfaces 5a formed inside. A thin pillar 6 having a square outer shape is fitted into the cylindrical inside of the thick pillar 5. A guide member 7 and an adjusting member 8 are attached to one side surface of the thin strut 6. The guide member 7 and the adjusting member 8 are also attached to the opposite surfaces.

The guide member 7 is made of synthetic resin, and the projection 7 a is fitted into a hole (not shown) formed in the thin strut 6. Therefore, in the state shown in FIG. 1, the guide member 7 can be freely removed from the thin column 6, but they may be press-fitted. The guide member 7 covers two adjacent corners of the thin column 6 and is in sliding contact with the inner wall surface 5a. The guide member 7 has a friction portion 7Bb formed on one side in the longitudinal direction of the column 6 with the projection 7a interposed therebetween, and a foot portion 7c formed on the other side.

The friction portion 7b projects from the end of the thin strut 6 toward the thick strut 5 in FIG. 1, and an elastic force acts in a direction substantially orthogonal to the thick strut 5. As described above, the foot portion 7c covers the corner portion of the thin column 6 and is given elasticity in the vertical direction in FIG. The adjusting member 8 is screwed into the thin column 6, and the head has a substantially octagonal shape with a square corner having a large arc surface as seen in FIG. 2, and is engaged with the foot 7c. There is.

FIG. 2 and FIG. 3 show a state in which a thin strut 6 is fitted into a thick strut 5. Needless to say, an appropriate retaining mechanism (not shown) is provided between the two. As can be seen in FIG. 2, the friction portion 7b is pushed by the inner wall surface 5a at two positions, up and down, and is compressed from the position indicated by the chain double-dashed line to the position indicated by the solid line against the elastic force. Therefore, the frictional force between the friction portion 7b and the inner wall surface 5a holds the relative positions of the columns 5 and 6. Of course, this frictional force does not affect the human power and does not affect the stretching operation.

By the way, in such a configuration, the tip end (left end) of the thin column 6 in FIG. 2 is likely to move upward during extension. In order to prevent this, in this embodiment, the adjusting member 8 is rotated by a flat-blade screwdriver or the like to push up the foot portion 7c against its elasticity, so that it acts as if it fills the gap between the two columns. As a result, the upper surface of the guide member 7 comes into contact with the thick column 5 at two points in the left-right direction in FIG. 2, and the tip of the thin column 6 is prevented from moving vertically.

After adjusting the position of the foot portion 7c in the assembling stage, the adjusting member 8 is fixed to that position by a known means. Therefore, the adjusting member 8 does not need to be screwed as in the embodiment, and does not prevent the use of so-called eccentric cams, triangular cams, or the like.

In the above description, the guide member 7 has the friction portion 7b and the foot portion 7c integrally formed of synthetic resin, but it does not matter if they are separately manufactured and assembled. Alternatively, the thin columns 6 may be fixed with screws or the like. Although the shape of the friction portion 7b is substantially B-shaped in FIG. 2, it may be substantially D-shaped or substantially C-shaped as long as it has the above-mentioned function. Further, a leaf spring may be provided on the guide member 7.

Next, a modification of the above-described embodiment will be described with reference to FIGS. 4 and 5. In FIG. 4, the thin column 6 has a square shape, but the inner surface of the thick column has an oval shape. Then, the shape of the foot portion 7c is deformed in relation to it. As described above, in the present invention, the inner wall surface of the thick support column 5 may be polygonal, and need not be flat, and the same can be said with respect to the outer shape. There is no need to match the outer shape of the thinner column 6. Further, in FIG. 5, the outer shape of the thin column 6 is not a quadrangle but an oval shape. And the shape of the foot portion 7c is deformed in relation to it. As described above, in the present invention, the outer shape of the thin strut 6 does not have to be a flat surface, and various shapes can be considered. Further, the thin strut 6 is not particularly formed into a tubular shape unless a thinner strut is fitted therein.

The present invention is most suitable for use in a material image input device or an overhead projector, but is not limited to these.

[0018]

[Effect of device]

 As described above, according to the present invention, a foot member is provided on a guide member having a friction portion and attached to a thin strut, and the foot member is moved by an adjusting member so that it is substantially in contact with the inner wall surface of the thick strut. Since it is possible to adjust it, it is possible to suppress rattling between a thin strut and a thick strut when extended.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a partial cross-sectional explanatory view showing a fitted state of two columns.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 shows a modified example in which the shapes of thick columns are different,
FIG. 3 is a sectional view similar to FIG. 2.

FIG. 5 shows a modification in which the shapes of the thin columns are different,
FIG. 5 is a sectional view similar to FIGS. 2 and 4.

FIG. 6 is an explanatory diagram of a material image input device to which the present invention can be applied.

[Explanation of symbols]

 5 Thick support 5a Inner wall surface 6 Thin support 7 Guide member 7a Protrusion 7b Friction part 7c Foot 8 Adjustment member

Claims (7)

[Scope of utility model registration request] 1. An extendable and retractable strut in which a thin strut is fitted to an inner wall surface of a thick strut so that the stretched state of both strut can be maintained by friction. A friction portion that is elastically engaged with the inner wall surface of the thick strut and can maintain the extended state of both the strut is formed on one side in the longitudinal direction of the thin strut with the mounting portion interposed therebetween. Is attached to the outer surface of the thin strut so as to be rotatable, and the rotation of the foot resists the elastic force to the inner wall of the thick strut. A friction stopping mechanism in a telescopic column, comprising: an adjusting member that can be deformed by a desired amount. 2. The thin pillar is a prism, and the guide member covers two adjacent corners of the thin pillar, and is attached to the thin pillar between them. A friction stopping mechanism for the expandable support column. 3. The friction portion protrudes in the longitudinal direction from the end of the thin strut, and is elastically engaged with the inner wall surface of the thick strut at two ends in the direction substantially orthogonal to the longitudinal direction. The friction stop mechanism in the telescopic support according to claim 1 or 2. 4. The guide member is provided with a protrusion, and the protrusion is fitted into a hole provided in a thin column. A friction stop mechanism for the telescopic support. 5. The friction stopping mechanism for an extendable column according to claim 1, wherein the guide member is integrally molded of synthetic resin. 6. The thin column is a quadrangular column, and the guide member and the adjusting member are attached to two outer surfaces of opposite sides thereof, respectively. Friction stop mechanism on the retractable support column. 7. The friction stop mechanism for a telescopic column according to claim 1, wherein the inner wall surface of the thick column is formed in a substantially similar shape corresponding to the outer shape of the thin column. .