JP4536247B2 - Clamping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clamp device for attaching a desk lamp, a telephone stand, and other optional items to a desk top plate, a shelf plate, and other members.
[0002]
[Prior art]
For example, as a means to attach a desk lamp, a telephone stand, or other optional items to the edge of the desk top plate, a clamp device that has been conventionally clamped to the edge of the desk top plate has been used, and an optional item can be installed in the support hole of this clamping device. The support is inserted and supported.
[0003]
In the past, the clamp device had a U-shape in side view and a clamp member with a support hole in the upper piece was fitted to the edge of the desk top plate, a pusher was screwed into the lower piece, and the knob at the lower end was turned. By moving it, the upper end of the pressing bar and the upper piece are clamped to the edge of the desk top plate.
[0004]
However, in this structure, when the clamp member is clamped to the desk top plate, it is difficult to operate because the pusher knob has to be rotated on the lower surface side of the desk top plate, and in particular, a plurality of desks are arranged. In some cases, it was difficult to insert a hand into the lower surface of the desk top plate, and even if a hand entered, it was extremely difficult to turn the knob and tighten it firmly.
[0005]
Therefore, in order to solve these problems, the conventional utility model registration No. 2517625 (known example 1) and Japanese Patent Laid-Open No. 10-213288 (hereinafter referred to as Japanese Laid-Open Patent Publication No. 10-213288) have been proposed. Known example 2), Japanese Patent Laid-Open No. 2000-104712 (known example 3) and the like have been proposed.
[0006]
[Problems to be solved by the invention]
However, in the case of the above-mentioned known example 1, the male screw part of the shaft tube is exposed to the outside as the thickness of the desk top becomes thinner, and it is not preferable in appearance and can be seen from the top surface of the desk. There is a problem that the support height of the product changes.
[0007]
In the known example 2, a screw hole is integrally formed in the upper piece of the fixture having a U-shape in side view, and the press contact tool at the lower end of the fixture screwed into the screw hole from above is the desk top plate. In addition to the problem that the male screw part is exposed depending on the thickness of the desk top plate because the lower piece of the fixture and the press tool are clamped to the edge of the desk top plate by pressing the upper surface. When the fixture is made of synthetic resin, the thickness is increased in order to give a predetermined strength, which is not preferable in appearance.
[0008]
When the fixture is made of metal, the female screw cylinder is also made of metal, and it is inevitable that a process such as welding is required for its integration, resulting in high costs. Furthermore, the integral molding by die-casting or the like further increases the cost and requires an internal thread machining, resulting in an increase in man-hours.
[0009]
In particular, the male screw part and the pressure contact part are held by press-fitting a resin molded product, and the male screw and female screw are always in contact with each other. If the screw cylinder is continuously rotated, there is a risk that the pressure contact part may be detached from the male screw cylinder or the thread part may be deformed.
[0010]
In the known example 3, the frame made of sheet metal is internally threaded, so that the joint surface with the external thread portion cannot be made large, so that the internal thread portion is likely to be deformed, and the frame is directly threaded. Therefore, when this is deformed, the entire frame must be replaced.
[0011]
In addition, the head of the screw part and the clamp body are connected by an E-ring, and the screw part and the screw part of the clamp body are always in contact with each other. If it continues to rotate, the frame and the clamp body come into contact with each other, and there is a possibility that any of the head, the clamp body, and the frame will be deformed.
[0012]
The present invention enables the operation from the upper surface side of the desk top plate, does not affect the thickness of the desk top plate, and does not change the exposure of the screw part or the support height of the optional product. An object of the present invention is to provide a clamp device that does not cause damage to components due to idling beyond a certain degree of opening even if it is too much.
[0013]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, the present invention provides a U-shaped main body having a substantially U-shape in side view and the U-shaped main body formed separately from each other and attached to the upper piece of the U-shaped main body. A clamp body having a female screw portion , a tightening member having a rotation operation portion at the upper portion and a screw shaft portion screwed into the female screw portion at the lower portion, and a neck portion of the tightening member on the upper surface. An outer cylinder through which a through hole is inserted and supported so as to include an upper portion of the clamp main body, and a pressing piece that is engaged with the lower end of the screw shaft portion of the tightening member and press-contacts the upper surface of the desk top plate A screwless portion that does not screw into the thread of the female screw portion is formed at the lower end portion of the screw shaft portion of the tightening member, and the tightening member is tightened when loosened to the maximum and raised. The member is idled. The clamp main body is made of metal, and the female screw portion and the tightening member are made of resin.
[0014]
As a result, even if the tightening member is excessively rotated to loosen it so as to widen the gap between the lower piece and the pressing piece of the clamp body, it reaches the end of rotation in the loosening direction. The screwless part of the screw shaft of the tightening member will be located in the female threaded part of the clamp body, and the tightening member will run idle, and damage such as deformation of the clamp body and pressing plate due to over-loosening Never give.
[0015]
The female thread part of the clamp body is constituted by a female thread formed on the inner peripheral surface of a split half-circular part piece that is non-rotatably fitted in a through hole formed in the upper piece of the clamp body. This facilitates the manufacture of the clamp body and allows both the tightening member and the female screw part to be obtained from a resin molded product, so that the axial length of the female screw part is increased even if the clamp body is made of metal. This is preferable.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 shows an exploded perspective view of an embodiment of the clamping device according to the present invention, and FIG. 2 shows a sectional view of the assembled state after the assembly. The clamping device is roughly divided into a clamp body 1 and a fastening body. The insert member 2, the outer cylinder 3, and the pressing piece 4 are configured.
[0017]
The clamp body 1 is made of a rigid metal formed in a substantially U shape in a side view, and is composed of an upper piece 1a, a vertical piece 1b, and a lower piece 1c. The upper piece 1a has a female screw portion. 5 is provided. In the illustrated embodiment, as shown in FIGS. 1A and 5, the female screw portion 5 has a through hole 6 formed in the upper piece 1 a of the clamp body 1 and is fitted into the through hole 6. It consists of female screws 8, 8 engraved on the inner periphery of resin-made pieces 7, 7 having a symmetrical half-circular shape.
[0018]
Concave portions 9 and 9 are formed in the through hole 6 at symmetrical positions on the diameter line, and convex portions 10 and 10 engaged with the concave portions 9 and 9 are formed at the center of the outer peripheral surface of the pieces 7 and 7. The grooves 7 a and 7 a formed in the outer circumferential direction of the pieces 7 and 7 are fitted to the inner periphery of the through-hole 6 so that the protrusions 10 and 10 are fitted into the recesses 9 and 9. Accordingly, the respective pieces 7 and 7 are attached in a non-rotating state, and the female screw portion 5 is constituted by the female screws 8 and 8 of the both piece pieces 7 and 7.
[0019]
As shown in FIGS. 1 to 4, the tightening member 2 is connected to a knob-shaped turning operation unit 11 having a size suitable for turning by hand and a lower part of the turning operation unit 11. The screw shaft portion 12 is made of resin and is screwed into the female screws 8 and 8 of the female screw portion 5 from the position protruding from the lower surface of the rotation operation portion 11 of the screw shaft portion 12 to the lower end. When the tightening member 2 is most loosened on the outer periphery of the lower end portion of the screw shaft portion 12 (shown in FIG. 3), the axial length range corresponding to the female screws 8 and 8 is formed. Is a non-threaded portion 14 that does not have a male screw and can rotate idly regardless of the female screws 8 and 8. When the tightening member 2 is rotated in the tightening direction, the lower end of the male screw 13 engages with the screw ends of the upper ends of the female screws 8 and 8 and can be screwed.
[0020]
A support hole 2a is formed at the center of the tightening member 2 in the axial direction for inserting an optional leg portion from its upper end.
[0021]
The outer cylinder 3 is formed in a U-shaped cross-section so that the upper part of the clamp body 1 can be included, and a part of the outer periphery thereof protrudes to bulge outward, and the inside of the outer cylinder 3 is the clamp body. The first vertical piece 1b is a recess 15 into which the outer cylinder 3 is not rotated.
[0022]
The upper surface of the outer cylinder 3 has a through hole 16 through which the screw shaft portion 12 of the tightening member 2 can be inserted. The large diameter portion 12a (neck of the upper portion of the screw shaft portion 12 is inserted into the through hole 16. Part) is supported by the ring member 17 as a stopper so as to be integrally movable with the fastening member 2.
[0023]
The pressing piece 4 is a plate having a size that can be accommodated in the outer cylinder 3. The pressing piece 4 has a protruding piece 18 protruding in a square shape at a part of its outer periphery, and an edge 18 a of the protruding piece 18 is formed. By being opposed to the vertical piece 1b of the clamp body 1, it becomes non-rotating, and a plurality of locking pieces 19 are projected upward by slitting at the center of the upper surface, A locking claw 20 formed on the outer surface is inserted and locked in a locking hole 21 formed in the lower end surface of the screw shaft portion 12 of the tightening member 2 and attached to the lower end of the screw shaft portion 12. ing. A part of the lower end of the outer cylinder 3 is in contact with a part of the peripheral edge of the pressing piece 4, and the pressing piece 4 is concealed so that it cannot be seen from the outside.
[0024]
In FIG. 2, reference numeral 22 denotes a desk top plate.
[0025]
Next, the operation of the above embodiment will be described.
In order to attach the clamping device according to the present invention to the edge of the desk top plate 22, when the tightening member 2 is rotated in the loosening direction, the male screw 13 of the screw shaft portion 12 and the female screw 8 of the female screw portion 5; The tightening member 2 is lifted with respect to the clamp body 1 by screwing with the clamp body 1, and the pressing piece 4 is also lifted accordingly, and the interval (clamping interval) between the pressing piece 4 and the lower piece 1 c of the clamp body 1 is increased. As it expands, the outer cylinder 3 rises by the same amount.
[0026]
When the distance exceeds the thickness of the desk top plate 22, the lower piece 1c of the clamp body 1 is engaged with the lower surface of the edge of the desk top plate 22, and the pressing piece 4 is positioned on the upper surface of the desk top plate 22 and tightened. If the member 2 is rotated in the tightening direction opposite to the above, the tightening member 2 is relatively lowered by the screwing of the screw shaft portion 12 and the female screw portion 5, and the pressing piece is accordingly moved. 4 is lowered and comes into contact with the upper surface of the desk top plate 22, and further tightened, the pressing piece 4 comes into pressure contact with the desk top plate 22, and the pressing piece 4 and the lower piece 1 c of the clamp body 1 make the desk top plate 22. The clamping device is fixed to the desk top plate 22 by firmly holding the edges of the desk.
[0027]
Since the outer cylinder 3 also moves at this time, the screw shaft portion 12 of the tightening member 2 and the female screw portion 5 at the top of the clamp body 1 are completely concealed by the outer tube 3, and the screws are not visible from the outside. The appearance is arranged. If the thickness T ₁ of the desk top plate 22 is thin in FIG. 2 (A), it shows a cross-sectional view of a mounting state when the thickness T ₂ of the desk top plate 22 is thicker in FIG. 2 (B).
[0028]
After mounting in this manner, an optional product can be mounted in the support hole 2a of the fastening member 2. As an example, FIG. 8A shows a state in which the legs of a desk lamp 23 as an optional product are inserted into the support hole 2a, and FIG. It is attached to both sides of the edge, and the left and right legs of the panel 24 for blindfolding are inserted into this to form a partition.
[0029]
When removing the clamp device, if the tightening member 2 is rotated in the loosening direction opposite to that at the time of attachment, the female screw portion 5 is relatively lowered and the lower piece 1c of the clamp body 1 is lowered and pressed. The space | interval of the piece 4 and the lower piece 1c expands, and it can remove from the edge of the desk top plate 22 by this.
[0030]
If the tightening member 2 is rotated excessively when attempting to widen the space between the pressing piece 4 and the lower piece 1c by rotating the tightening member 2 in the loosening direction at the time of attaching the clamp device as described above, As shown in FIG. 3, it can be seen that the lower end of the male screw 13 of the screw shaft portion 12 is disengaged from the female screws 8 and 8 of the female screw portion 5, whereby the tightening member 2 is idled and the interval is not further increased. At the same time, unnecessary force is not applied, and the occurrence of deformation of the constituent members, damage to the screws, and the like can be avoided. Even if the tightening member 2 is loosened excessively, the tightening member 2 will not come off because it is connected by the locking piece 19 on the pressing piece 4.
[0031]
If the tightening member 2 is rotated in the tightening direction for attachment again, the end of the thread at the lower end of the male screw 13 of the screw shaft portion 12 is at the beginning of the female screws 8 and 8 of the female screw portion 5. It can be hooked and screwed, and it can shift to tightening as described above.
[0032]
【The invention's effect】
As described above, according to the present invention, the fastening member is placed at a certain height on the upper surface regardless of the thickness of the member to be attached such as a desk top plate. The height does not change depending on the thickness of the desk top, etc., and the appearance after attaching optional items can be unified.
[0033]
Further, when the clamp device is attached to the desk top plate, the screw portion is completely concealed by the outer cylinder regardless of the thickness of the desk top plate or the like, so that the scenery is not impaired.
[0034]
Especially when the clamping device is widened when attaching the clamp device, even if the tightening member is excessively rotated in the loosening direction, the tightening member is idled at the end of the rotation, so the screw part and configuration An excessive force is not exerted on the member, and therefore, deformation and breakage of these members can be surely prevented.
[0035]
If the female threaded portion of the clamp body into which the tightening member is screwed as in claim 2 is configured as a separate part from the clamp body, the clamp body is made of tough metal and the female threaded portion is made of resin. Similarly, a resin fastening member can be screwed into the female screw portion, and the resin screw is not screwed in, and neither deformation nor partial wear occurs. Even if breakage occurs, it can be repaired simply by converting the pieces constituting the female screw portion, and it is also easy to sort by material even when discarded.
[Brief description of the drawings]
FIG. 1 is an exploded view of a clamping device according to the present invention, in which (A) is a component and (B) is a partially assembled perspective view.
FIGS. 2A and 2B show a state where the desk top plate is attached, FIG. 2A is a cross-sectional view when the desk top plate is thin, and FIG. 2B is a cross-sectional view when the desk top plate is thick;
FIG. 3 is a cross-sectional view showing a state when the clamp interval of the clamp device is maximized.
4A and 4B show a tightening member, in which FIG. 4A is a front view, FIG. 4B is a cross-sectional view, and FIG.
5A and 5B show pieces constituting the female screw portion, in which FIG. 5A is a plan view, and FIG. 5B is a cross-sectional view taken along line AA in FIG.
6A and 6B show a clamp body, where FIG. 6A is a side view and FIG. 6B is a plan view.
FIGS. 7A and 7B show a state in which the female screw part is assembled to the clamp body, FIG. 7A is a cross-sectional view, and FIG.
FIGS. 8A and 8B are perspective views showing an example of attaching an optional product using the clamping device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Clamp main body 2 Fastening member 3 Outer cylinder 4 Pressing piece 5 Female thread part 7 Part 11 which comprises a female thread part Rotation operation part 12 Screw shaft part 14 Screwless part 22 Desk top plate

Claims (3)

A clamp body comprising a U-shaped main body portion having a substantially U-shape in a side view and a female screw portion formed separately from the U-shaped main body portion and attached to an upper piece of the U-shaped main body portion ;
A tightening member having a rotating shaft at the upper part and a screw shaft part screwed into the female screw part at the lower part;
An outer cylinder through which a through-hole on the upper surface is inserted and supported in the neck portion of the tightening member, and can be fitted over the upper portion of the clamp body;
A pressing piece that is attached to the lower end of the screw shaft portion of the tightening member and press-contacts the upper surface of the desk top plate;
A screwless portion that does not screw into the thread of the female screw portion is formed at the lower end portion of the screw shaft portion of the tightening member, and when the tightening member is loosened to the maximum extent, the tightening member A clamping device characterized by idling.   The clamp apparatus according to claim 1, wherein the clamp body is made of metal, and the female screw portion and the tightening member are made of resin. The female thread portion of the clamp body is constituted by a female thread formed on the inner peripheral surface of a split half-circular portion piece that is non-rotatably fitted in a through hole formed in the upper piece of the clamp body. The clamping device according to claim 1 or 2, wherein:

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