JPS5936125B2 - expansion anchor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an expansion anchor suitable as a suspension anchor, which comprises an expansion sleeve having an elongated slot in the expansion portion, an expansion element disposed within the expansion sleeve, and an expansion anchor that is connected to the inner surface of the expansion sleeve. Over at least a portion of the length of the anchor in contact with the outer surface of the expansion element, the cross-sectional shape of the expansion sleeve and the expansion element, which is substantially perpendicular to the main axis of the anchor, is different from a circular or annular shape; The present invention relates to an expansion anchor that expands by rotating an element.

Various types of suspension elements are known for suspending ceilings, frames, pipes, cables, etc.

Due to the use of a large number of hanging elements in the construction of buildings,
When installing the suspension element, it is desirable to be able to install it in a short time and without using special tools.

A commonly used suspension element is an expansion anchor, which is a combination of an expansion sleeve and an expansion element.

An example of a known expansion anchor is an expansion element having a corrugated plate-like member that is engaged within a slotted expansion sleeve.

The expansion sleeve is expanded and secured within the bore by driving the expansion element toward the anterior end.

Other known expansion anchors have an expansion element of circular cross-section and a slotted expansion sleeve of annular cross-section, with one end of the expansion element tapering conically to widen forwardly.

By moving the expansion element outwardly of the bore, the expansion sleeve is radially expanded and secured within the bore.

The first known expansion anchor is extremely time consuming to drive the expansion sleeve into the hole relative to the expansion element.

Furthermore, it is not possible to attach height adjustment members, suspension rods, etc. to the expansion element from the beginning.

Attaching suspension rods and the like after attaching the expansion anchors is a very time consuming task, especially when the installation is at a high location.

A disadvantage of the second known expansion anchor is that the expansion element is not dimensioned from the slab surface.

The nature of the perforation changes the dimensions between the expansion element and the slab surface, as the expansion element must be pulled outwards sharply to expand the expansion sleeve.

Therefore, a time-consuming process is required to adjust the length of the suspension rod etc. for each expansion anchor.

Further, the expansion sleeve remains expanded only while a tensile load is applied to the expansion element, and the anchor may be pulled out due to vibrations or the like.

The principles of expansion for other uses of expansion anchors, such as anchor bolts, may not be applicable to suspension anchors.

For example, expansion by torsion or relative rotation between the expansion element and the expansion sleeve requires axial guidance between the expansion element and the expansion sleeve.

Due to the fixed relative position determined by the shape of the expansion sleeve and expansion element, the axial loads that occur during suspension do not cause expansion of the sleeve and the anchor may be pulled out of the hole as a whole.

Furthermore, when the anchor is subjected to longitudinal loads in both directions, the expansion sleeve and expansion anchor move together, creating a tendency for the sleeve to loosen within the bore.

An object of the present invention is to provide an expansion anchor suitable for suspension, which does not require special tools, maintains a fixed position under no load, and whose fixation force increases as the load increases.

A feature of the expansion anchor according to the invention to achieve the above-mentioned object is that, in the above-mentioned type, at least a portion of the external shape of the expansion element and/or the internal shape of the expansion sleeve has a cross section in the direction of the anterior edge of the anchor. Expand towards.

Since the cross-sectional shapes of the inner surface of the expansion sleeve and the outer surface of the expansion element are different from circular or annular shapes, the expansion sleeve is expanded by twisting or relative rotation between the expansion element and the expansion sleeve.

The cross-sectional shape of the expansion sleeve and/or expansion element widens toward the anterior end of the anchor, so that any load that causes relative movement between the expansion sleeve and expansion element in the axial direction acts as a force to further expand the expansion sleeve. do.

The inner shape of the expansion sleeve and the outer shape of the expansion element can be any desired shape.

For example, the outer surface of the expansion element can be cam-shaped and the inner surface of the expansion sleeve can be spiral.

Similarly, the cross-sectional shape can be a double eccentric circle and expansion can be caused by relative rotation.

If the cross-sectional shape of the expansion element and expansion sleeve is a curved polygon with arcuate corners, an equal radial force will act on each part of the expansion sleeve.

According to an embodiment of the invention, the outer surface of the expansion element is elliptical.

The elliptical shape includes not only a mathematically accurate ellipse but also an approximate ellipse that is a symmetrical combination of two types of circular arcs.

Approximate ellipses are significantly easier to manufacture. If the inner surface of the expansion sleeve combined with this expansion element is also elliptical, the relative rotation angle for expansion will be 90°.

If the shape of the expansion element expansion sleeve is a combination of eccentric circles, the relative rotation angle for expansion will be 180°.

There are various methods for widening the cross-sectional shape of the inner surface of the expansion sleeve toward the front end.

It is also possible to widen only one of the outer surface of the expansion element or the inner surface of the expansion sleeve toward the front end.

An embodiment for creating an even expansion force distribution over the entire expansion portion of the expansion anchor is to widen the expansion element outer surface and the expansion sleeve inner surface evenly toward the anterior end.

It is possible to provide a wider portion for a desired length of the anchor.

Other embodiments include widening the cross-sectional shape of at least a portion of the outer surface of the expansion element and/or at least a portion of the inner surface of the expansion sleeve toward the anterior end of the anchor for substantially the entire length of the cross-sectional shape.

In this case, after the expansion element is rotated to perform the first expansion, a relative movement occurs when a tensile load is applied between the expansion element and the expansion sleeve, the expansion sleeve expands further, and the receiver is exposed to the material. Closely adheres to the hole.

The widening portion is a portion of the outer surface of the expansion element past the circular cross-section of the base and a portion of the inner surface of the expansion sleeve anterior to the circular cross-section of the base.

According to another embodiment, the longitudinal slot of the expansion sleeve is inclined with respect to the main axis of the anchor.

As a result, when the expansion element is rotated, it does not fully engage the slot of the expansion sleeve, and even if the expansion is insufficient, the expansion element will expand the expansion sleeve to tightly fit into the hole when a tensile load is applied. .

An embodiment in which the cross-sectional shape in the longitudinal direction of the anchor is made into an ellipse or the like and the cross-sectional shape is widened toward the front end to absorb the longitudinal component force is a cross-sectional shape in the axial direction between the expansion element and the expansion sleeve. A contact portion is provided to limit relative movement.

As a result, the component force that moves the expansion element toward the front end becomes an expansion force of the expansion sleeve.

This allows the expansion anchor of the invention to be used not only for suspension purposes but also as a quick coupling element.

When used as a quick coupling element, it can also be used as a rotational motion transmission device, and can also be used as a support member for attaching a decorative board to a flat wall.

According to an embodiment of the present invention, a collar provided at the rear end of the expansion element is made to protrude outward from the inner peripheral surface of the rear end of the sleeve as a contact portion.

In another embodiment, the yoke provided at the front end of the expansion sleeve projects inward beyond the inner peripheral surface of the sleeve.

Providing a contact between the expansion element and the expansion sleeve absorbs axial force components caused by rotation of the expansion element.

Therefore, rotation of the expansion element acts only as an expansion of the expansion sleeve.

A soft receiver is particularly advantageous when the difference between the sleeve diameter and the hole diameter is large, or when attaching the anchor to a material.

In order to significantly simplify the installation of the expansion anchor, an embodiment is provided in which a stop device is provided to limit the insertion depth in the hole, the receiver bringing the stop device into contact with the material surface during insertion of the anchor.

As an embodiment for this purpose, a flange protruding from the outer peripheral surface of the rear end of the expansion sleeve is used as a stop device.

In another embodiment, the rear end of the expansion element is provided with a stop device that projects beyond the circumference of the expansion sleeve to limit the insertion depth.

The diameter of the collar provided on the expansion element can be made smaller than the diameter of the expansion sleeve.

Embodiments and drawings illustrating the present invention will be described.

1 to 3 show an expansion sleeve 1 according to a first embodiment of an expansion anchor according to the invention.

The inner surface 1a of the expansion sleeve 1 has an oval shape as shown in FIG. 3, and its long axis gradually becomes dog-shaped toward the front end 1b of the sleeve.

The outer peripheral surface 1d of the sleeve 1 is cylindrical in the illustrated position,
The rear end 10 projects radially outward from the outer circumferential surface 1d to form a flange 2, forming a first stop device.

Two slots l-3 are formed in the longitudinal direction of the sleeve 1,
One slot extends the entire length of the sleeve, including the flange 2.

In the illustrated example, there are two slots 3, but the number of slots 3 may be four, six, etc. as required.

The slope of the ellipse is shown as an example of a significantly large slope for clarity of illustration, but it can be set to any slope as required.

The minor axis of the ellipse may not be constant.

4-6 show an expansion element 4 in combination with the expansion sleeve 1 of FIGS. 1-3.

In the illustrated example, the extension element 4 is unsuspended for ceiling mounting.

As shown in FIG. 6, the expanded portion 4a of the expansion element 4 has an outer shape 4b having an elliptical cross section, and the long axis of the ellipse of the outer shape 4b gradually becomes dog-shaped toward the front end.

A collar 5 is connected to the rear end of the extended portion 4a.

An eye-shaped part 6 is provided at the rear of the collar 5.

A member to be suspended, such as a ceiling rod, is connected to the hole 7 of the eye-shaped portion 6.

In place of the eye-shaped portion, external threads, internal threads, etc. may be used.

FIG. 7 shows a state in which the expansion sleeve 1 and the expansion element 4 shown in FIGS. 1 to 6 are combined, the receiver is inserted into the hole 11 of the substance 11b, and the sleeve 1 is not expanded.

In order to combine the expansion element 4 and the expansion sleeve 1, the expansion part 4a and the sleeve 5 are made removable or the slot 3 extending over the entire length of the sleeve 1 is opened.

The expansion anchor inserted into the hole 11 shown in FIG.
The process of fixation inside is as follows.

First, the anchor is inserted into the hole 11, ensuring that the stop device or flange 20 surface is in contact with the outer surface 11a of the material 11b.

Next, the expansion element 4 is rotated 90° about the longitudinal axis.

Since both the inner surface 1a of the expansion sleeve 1 and the outer surface 4a of the expansion element 4 are shaped to become wider toward the front end, the force pushing the expansion element 4 into the hole 11 and the expansion sleeve 1 are expanded radially outward. component force acts.

The collar 5 of the expansion element 4 contacts the end face 1c of the expansion sleeve 1 and resists the axial force component, so that the sleeve 4 is opened radially and fixed in the bore 11.

When a downward load acts on the expansion element 4, it becomes a force in the axial direction between the surface 4b of the expansion element and the surface 1a of the sleeve, which causes the expansion sleeve 1 to further expand. It doesn't move.

Therefore, during installation and use of the expansion anchor, the relative position of the expansion element 4 with respect to the material orientation 11a of the receiver does not change.

Figures 8 and 9 show an expansion sleeve 8 according to a second embodiment of the invention.

The inner surface 8a of the expansion sleeve 8 is shaped like an ellipse like the expansion sleeve 1 shown in FIGS. 1 to 3, and the front end 8b of the sleeve 8
The shape becomes wider towards the end.

The slot 9 provided in the sleeve 8 is inclined with respect to the axis of the sleeve 8 in the illustrated example.

One of the slots extends from the front end of the sleeve 8 to the rear end.

A yoke 10 is connected to a portion of the diametrically opposed front end 8b of the sleeve 8 to serve as a stop device.

FIG. 10 shows an expansion anchor that combines the expansion element 4 shown in FIGS. 4-6 and the expansion sleeve 8 shown in FIGS. 8-9.

When the anchor is inserted into the hole 11 in the material, the yoke 10
contacts the bottom of the hole to determine the position of the anchor.

The sleeve 8 therefore does not require the flange 2 shown in FIGS. 1-3.

The collar 5 of the expansion element 4, in the illustrated example, is larger than the diameter of the hole 11 in the material 11b and defines the depth of the anchor when it is secured.

When the expansion element 4 is rotated to expand the expansion sleeve 8, the upper surface of the collar 5 of the expansion element 4 contacts the surface 11a of the receiving material 11b due to the elasticity of the yoke 100.

The expansion element 4 is yaw 1 relative to the sleeve 8 in the longitudinal direction.
By making it movable against zero elasticity, it is a significant advantage when the difference between the inside diameter of the hole and the outside diameter of the sleeve is large, or when the material is soft, and stable friction is achieved after 900 full rotations. Make contact.

[Brief explanation of the drawing]

1 is a longitudinal sectional view of an expansion sleeve forming part of an expansion anchor according to the present invention, FIG. 2 is a sectional view taken along line II-n in FIG. 1, and FIG. 3 is a plan view of FIG. 1; Figure 4 shows numbers 1-
Side view of the expansion element combined with the expansion sleeve of Figure 3, No. 5
The figure is a left end view of Fig. 4, Fig. 6 is a plan view of Fig. 4, and Fig. 7 is a top view of Fig. 4.
The figure is a sectional view of an expansion anchor that combines the expansion sleeve of Figures 1 to 3 and the expansion element of Figures 4 to 6, Figure 8 is a sectional view of the expansion sleeve according to the second embodiment, and Figure 9 is a sectional view of the expansion The side view of the figure, FIG. 10, is a sectional view of an expansion anchor that combines the expansion sleeve of FIGS. 8 and 9 with the expansion elements of FIGS. 4-6. 1.8... Expansion sleeve, 1a, 8a...
...Inner surface, lb, 8b...Front end, ld, 8d.
...Outer surface, 2...Flange, 3,9...
...Slot 1-14...Extension element-14a
...Exterior, 5...Color, 6...
...Eye-shaped part, 7, 11...hole, 10...
...Yoke, 11a...Uke is material plane, 11b.
...Uke is matter.

Claims (1)

[Claims] 1 An expandable anchor suitable as a suspension anchor, comprising an expansion sleeve having an elongated slot in the expansion portion, an expansion element disposed within the expansion sleeve, and an expansion element disposed within the expansion sleeve, the expansion sleeve having an inner surface and an expansion element disposed within the expansion sleeve. over at least a portion of the length of the anchor in contact with an outer surface of the expansion element, the cross-sectional shape of the expansion sleeve and the expansion element substantially perpendicular to the main axis of the anchor is different from a circular or annular shape; In the expansion anchor, in which the expansion anchor is expanded by rotating the expansion element, the cross section of at least a portion of the outer surface shape of the expansion element and/or the inward shape of the expansion sleeve is a front edge of the anchor. An expansion anchor characterized by expanding in the direction of.