JP2002161907A - Clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent components from being damaged by racing to over constant opening extent even though a screw is turned too much without being influenced by thickness of a disc ceiling plate or the like while operation is enabled to mount from the upper face side of the disc ceiling plate and without leading to variation to exposure of a thread part and supported height of an optional article. SOLUTION: A clamping device provides a clamping body l including approximately inversed C-shaped cross section, a fastening member 2 including a pivoting operation part 11 thereupon and a thread shaft 12 threadably inserted into a female thread part 5 of upper piece 1a of the clamping body 1 thereunder, an outer tube 3 on which a through hole of an upper face is inserted and supported on a neck part of the fastening member and can fit over to contain the upper part of the clamping member 1 and pressing piece 4, which is engaged to lower end of the thread shaft 12 of the fastening member 2 and presses and abuts to an upper face of the disc ceiling plate 22, forms a non-thread part 14, which dose not threadably engage to a screw thread of the female thread part 5, at a lower end part of the thread shaft of the fastening member 2 and is characterized by that the fastening member is adapted to race when the fastening member 2 is ascended to loose as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a clamp device for attaching a desk lamp, a telephone stand, and other optional items to a desk top, a shelf, and other members.

[0002]

2. Description of the Related Art For example, as a means for attaching a desk lamp, a telephone stand, and other optional items to the edge of a desk top plate, a clamp device that is conventionally clamped to the edge of the desk top plate has been used. An optional support is inserted into the hole to support it.

The former clamping device has a U-shape in a side view, and a clamp member having a support hole in an upper portion thereof is fitted to an edge of a desk top plate, a push rod is screwed in a lower portion, and a lower end of the lower portion is screwed. By rotating the knob, the upper end of the push rod and the upper piece are sandwiched between the edges of the desk top plate.

However, in this structure, when the clamp member is clamped to the desk top plate, it is necessary to turn the knob of the push rod on the lower surface side of the desk top plate.
In particular, when a plurality of desks are arranged, it is difficult to insert a hand into the lower surface side of the desk top plate, and it is extremely difficult to turn and squeeze the knob assuming that the hand has entered.

Therefore, in order to solve these problems, it has been proposed that a tightening operation can be performed on the upper surface side of the desk top plate, as disclosed in Japanese Utility Model Registration No. 2517625 (known example 1) and Japanese Patent Application Laid-Open No. 10-213288. Japanese Patent Application Laid-Open No. 2000-104712 (known example 3) and the like have been proposed.

[0006]

However, the above-mentioned known example 1
As described in the above, as the desk top plate becomes thinner, the external thread of the barrel is exposed to the outside, and it is not visible from the top of the desk, and it is not desirable in appearance. Is changed.

In the prior art 2, a screw hole is integrally formed in an upper piece of a mounting member having a U-shape in a side view, and a press-contacting tool at a lower end of a fixing tool to be screwed into the screw hole from above is a desk. Because the upper surface of the top plate is pressed, the lower piece of the fixture and the pressing tool are sandwiched between the edges of the desk top plate, so that the male screw portion is exposed depending on the thickness of the desk top plate as well. In addition to the point, when the attachment is made of synthetic resin, its thickness is increased to have a predetermined strength, which is not preferable in appearance.

If the mounting member is made of metal, the female screw cylinder is also made of metal, and it is inevitable that welding and other steps are required for integration, resulting in an increase in cost. In addition, the cost is further increased to integrally mold by die-casting or the like, and the number of steps is increased due to the necessity of female screw processing.

In particular, since the male screw portion and the press contact portion are held by press-fitting of the resin molded product and the male screw and the female screw are always in contact, the width of the holding portion of the desk top plate is maximized at the time of mounting. If the male screw cylinder is kept rotating as it is, there is a possibility that the press contact portion may come off from the male screw cylinder or the screw portion may be deformed.

[0010] In the known example 3, a female screw is formed on a sheet metal frame, so that the joint surface with the male screw is not large, so that the female screw is easily deformed.
In addition, since the frame is directly threaded, when the frame is deformed, the entire frame must be replaced.

Further, the head of the screw portion and the clamp body are connected by an E-ring, and the screw portion and the screw portion of the clamp body are always in contact with each other. If the head continues to be rotated, the frame and the clamp body come into contact with each other, and any of the head, the clamp body, and the frame may be deformed.

The present invention enables operation from the upper surface side of a desk top plate, and does not change the exposure of a screw portion and the support height of optional items without being affected by the thickness of the desk top plate. It is an object of the present invention to provide a clamp device that does not cause a component part to be damaged by idling at a certain opening degree or more even if the member is turned too much.

[0013]

According to the present invention, there is provided a clamp body having a substantially U-shape as viewed from the side, a rotating operation portion at an upper portion, and an upper piece of the clamp body at a lower portion. A tightening member having a screw shaft portion to be screwed into the female screw portion, and an outer cylinder capable of including the upper portion of the clamp main body and having a through-hole on an upper surface inserted and supported in a neck portion of the tightening member, and having an outer fitting. A pressing piece engaged with the lower end of the screw shaft portion of the tightening member and pressed against the upper surface of the desk top plate, and the lower end of the screw shaft portion of the tightening member is screwed into the thread of the female screw portion. A non-threaded portion that does not fit is formed, and the tightening member idles when the tightening member is loosened to the maximum and raised.

Due to this, even if the tightening member is excessively rotated to loosen the tightening member in order to maximize the distance between the lower piece and the pressing piece of the clamp body,
When the rotation end in the loosening direction is reached, the threadless portion of the screw shaft portion of the tightening member is located at the female screw portion of the clamp body, so that the tightening member idles, and the clamp is caused by excessive loosening. There is no damage such as deformation of the main body and the pressing plate.

The female screw portion of the clamp body is formed on the inner peripheral surface of a split semicircular piece that is non-rotatably fitted into a through hole formed in the upper piece of the clamp body. Since the clamp body is made of a screw, the clamp body can be easily manufactured, and both the tightening member and the female screw portion can be obtained by molding a resin. Therefore, even if the clamp body is made of metal, the axial length of the female screw portion can be obtained. Is preferable because it can be increased.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is an exploded perspective view of a clamp device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the clamp device in use after being assembled. The clamp device is roughly divided into a clamp body 1 and a clamp body. Enclosure 2
, An outer cylinder 3 and a pressing piece 4.

The clamp body 1 is made of a rigid metal having a substantially U-shape when viewed from the side, and includes an upper piece 1a, a vertical piece 1b, and a lower piece 1c. 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. Female screws 8, 8 engraved on the inner circumference of resin parts 7, 7 having a symmetrical semi-circular split shape
It consists of.

Concave portions 9 are formed in the through hole 6 at symmetrical positions on the diameter line, and convex portions 10 engaging with the concave portions 9 are formed at the center position of the outer peripheral surfaces of the pieces 7. ,
The protrusions 10 are fitted into the recesses 9, and grooves 7 a, 7 a formed in the circumferential direction of the outer surfaces of the pieces 7, 7 are fitted into the inner periphery of the through-hole 6. By doing so, the respective pieces 7, 7 are attached in a non-rotating state, and the female screws 8 of the both pieces 7, 7 constitute the female screw portion 5.

As shown in FIGS. 1 to 4, the tightening member 2 is connected to a knob-shaped turning operation portion 11 having a size suitable for turning by hand, and is connected to a lower portion of the turning operation portion 11. And a screw shaft portion 12 provided from a resin. The female screw portion 8 of the female screw portion 5 extends from a position of the screw shaft portion 12 protruding from the lower surface of the rotation operation portion 11 to a lower end thereof. When the tightening member 2 is most loosened around the lower end of the screw shaft portion 12 (FIG. 3).
2), the length range in the axial direction corresponding to the female screws 8, 8 is a screwless portion 14 having no male screw and capable of idling independently of the female screws 8, 8. When the tightening member 2 is rotated in the tightening direction, the lower end of the male screw 13 is
The upper end 8 is engaged with a screw end to be screwed in.

At the axial center of the tightening member 2, there is formed a support hole 2a for inserting an optional leg from its upper end.

The outer cylinder 3 is formed to have a downward U-shape in cross section so as to include the upper part of the clamp body 1, and a part of its outer periphery is projected so as to bulge outward and the inside thereof is formed. The recess 15 into which the vertical piece 1b of the clamp body 1 fits
By this fitting, the outer cylinder 3 is not rotated.

On the upper surface of the outer cylinder 3, the fastening member 2
The screw shaft portion 12 has a through hole 16 through which a large diameter portion 12a (neck portion) above the screw shaft portion 12 can be inserted. It is supported so as to be able to move up and down integrally with it.

The pressing piece 4 is a plate having a size large enough to be accommodated in the outer cylinder 3. A part of the outer periphery of the pressing piece 4 has a protruding piece 18 projecting in a square shape. When the edge 18a is opposed to the vertical piece 1b of the clamp body 1, it becomes non-rotatable. At the center of the upper surface, a plurality of locking pieces 19 are protruded upward by slitting. 1
9 is inserted and locked into a locking hole 21 formed in the lower end surface of the screw shaft portion 12 of the tightening member 2, and is attached to the lower end of the screw shaft portion 12. It has become. In addition, 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 as not to be seen from the outside.

In FIG. 2, reference numeral 22 denotes a desk top plate.

Next, the operation of the above embodiment will be described. In order to attach the clamp 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 screwing member 2 is raised with respect to the clamp body 1 by the screwing of the male screw 13 of the screw shaft portion 12 and the female screws 8 of the female screw portion 5, and the pressing piece 4 is also raised accordingly. The distance (clamp interval) between the lower piece 4 and the lower piece 1c of the clamp body 1 increases, and the outer cylinder 3 also rises by the same amount.

When the distance exceeds the thickness of the desk top 22, the lower piece 1 c of the clamp body 1 is engaged with the lower surface of the edge of the desk top 22, and the pressing piece 4 is positioned on the upper surface of the desk top 22. If the tightening member 2 is rotated in the tightening direction opposite to the above, the tightening member 2 relatively lowers by screwing the screw shaft portion 12 and the female screw portion 5, and Accordingly, the pressing piece 4 descends and contacts the upper surface of the desk top plate 22,
By further tightening, the pressing piece 4 is pressed against the desk top plate 22 and the pressing piece 4 and the lower piece 1c of the clamp body 1 firmly clamp the edge of the desk top plate 22. 22.

At this time, the outer cylinder 3 also moves, so that the screw shaft 12 of the tightening member 2 and the female screw 5 on the upper part of the clamp body 1 are completely hidden by the outer cylinder 3 so that screws can be seen from the outside. The appearance is adjusted without any problem. FIG.
(A) When the thickness _{T 1} of the desk top plate 22 is thin, 2
The thickness T ₂ of the desk top panel 22 (B) shows a sectional view of a mounting state when thick.

After the attachment, the tightening member 2
An optional item can be attached to the support hole 2a. As an example, FIG. 8A shows a state in which a leg of an optional desk lamp 23 is inserted into the support hole 2a, and FIG. The screen is attached to both sides of the rim, and the left and right legs of the blindfold panel 24 are inserted into the screen to form a partition.

When removing the clamp device, the female screw portion 5 is relatively lowered by turning the tightening member 2 in the loosening direction opposite to that at the time of mounting, and the lower piece 1c of the clamp body 1 is lowered. As a result, the interval between the pressing piece 4 and the lower piece 1c is enlarged, and thereby, it can be removed from the edge of the desk top plate 22.

When the tightening member 2 is rotated in the loosening direction at the time of mounting the clamp device as described above to increase the distance between the pressing piece 4 and the lower piece 1c, the tightening member 2 is excessively rotated. In this case, as shown in FIG. 3, the lower end of the male screw 13 of the screw shaft portion 12 is disengaged from the female screws 8, 8 of the female screw portion 5, whereby the tightening member 2 idles and the interval does not further increase. At the same time, unnecessary force is not applied, and deformation of components, breakage of screws, and the like can be avoided. Even if the fastening member 2 is excessively loosened, the fastening member 2 does not come off because it is connected by the locking piece 19 on the pressing piece 4.

When the tightening member 2 is turned in the tightening direction for mounting again, the end of the thread at the lower end of the male screw 13 of the screw shaft portion 12 becomes the female screw 8, 8 of the female screw portion 5.
Is hooked on the start end of the screwdriver, and can be shifted to tightening as described above.

[0032]

As described above, according to the present invention, the fastening member is fixed at a constant height on the upper surface thereof regardless of the thickness of the member to be mounted such as the desk top plate. The height of the optional items to be supported does not change depending on the thickness of the desk top plate or the like, and the appearance after the optional items are attached can be unified.

When the clamping device is mounted on the desk top, the screw portion is completely hidden by the outer cylinder regardless of the thickness of the desk top or the like, so that the view is not spoiled.

In particular, even if the tightening member is excessively rotated in the loosening direction when the clamp interval is widened when the clamp device is attached, the tightening member idles at the end of the rotation. It does not exert excessive force on the parts and the constituent members, so that their deformation and breakage can be reliably prevented.

According to a second aspect of the present invention, when the female screw portion of the clamp body into which the tightening member is screwed is made of a separate component from the clamp body, the clamp body is made of a tough metal, and the female screw portion is formed. A resin fastening member can also be screwed into the female screw portion as a resin, and the female screw portion is not screwed with each other, resulting in deformation and uneven wear of both. Even if wear or breakage occurs, it can be repaired simply by changing the pieces that constitute the female screw part,
In addition, there is an effect that it is easy to separate the materials by disposal at the time of disposal.

[Brief description of the drawings]

FIG. 1 shows an exploded view of a clamping device according to the invention,
(A) is a perspective view showing a state in which the components are assembled, and (B) is a partially assembled state.

FIG. 2 shows a state of being attached to a desk top plate,
(A) is a cross-sectional view when the desk top is thin, and (B) is a cross-sectional view when the desk top is thick.

FIG. 3 is a cross-sectional view showing a state where the clamp interval of the clamp device is maximized.

FIG. 4 shows a fastening member, (A) is a front view, (B)
Is a cross-sectional view, and (C) is a plan view.

FIGS. 5A and 5B show a piece constituting a female screw portion, where FIG. 5A is a plan view and FIG. 5B is a sectional view taken along line AA of FIG.

6A and 6B show a clamp body, where FIG. 6A is a side view and FIG.
Is a plan view.

FIGS. 7A and 7B show a state in which a piece of a female screw portion is assembled to the clamp body, wherein FIG. 7A is a cross-sectional view and FIG.

8 (A) and 8 (B) are perspective views showing an example of mounting an optional product using the clamp device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp main body 2 Tightening member 3 Outer cylinder 4 Pressing piece 5 Female screw part 7 Piece which comprises a female screw part 11 Rotation operation part 12 Screw shaft part 14 No screw part 22 Desk top plate

Claims (2)

[Claims] 1. A clamp body having a substantially U-shape in side view;
A tightening member having a rotating operation part at an upper part and a screw shaft part screwed into a female screw part of an upper piece of the clamp body at a lower part, and a through-hole on an upper surface is inserted and supported in a neck part of the tightening member. An outer cylinder capable of externally including the upper portion of the clamp body, and a pressing piece engaged with a lower end of a screw shaft portion of the tightening member and pressed against an upper surface of a desk top plate; At the lower end of the screw shaft portion of the member, a screwless portion which is not screwed to the thread of the female screw portion is formed, so that the tightening member idles when the tightening member is loosened to the maximum and raised. A clamping device characterized in that: 2. A female screw portion of the clamp body is formed on an inner peripheral surface of a half-circle shaped piece that is non-rotatably fitted into a through hole formed in an upper piece of the clamp body. 2. The clamping device according to claim 1, wherein the clamping device is formed by a female screw.