Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1998-01-28
1999-12-21
Wilson, Neill
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
411 601, 4113875, F16B 1304, F16B 1306
Patent
active
060040858
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase under 35 U.S.C. .sctn.371 of prior PCT International Application No. PCT/JP97/02072 which has an International filing date of Jun. 16, 1997 which designated the United States of America, the entire contents of which are hereby incorporated by reference.
TECHNICAL FIELD
BACKGROUND OF THE INVENTION
The present invention relates to an anchor such as anchor pin or an anchor bolt for use in mounting and securing various types of fixtures such as metal fittings onto structures such as concrete, bricks or blocks, etc., particular, the present invention relates to a self-drilling anchor which is capable of drilling starting holes by itself.
BACKGROUND ART
Conventional methods of mounting and securing various types of fixtures such as metal fittings onto structures such as concrete, bricks or blocks, etc., involve driving in anchor bolts or anchor pins before the cure of concrete, post-anchoring to be performed after the cure of concrete, and driving in pins under the influence of powders. The present invention relates to the post-performance of anchoring.
The exemplary conventional post-performance of anchoring includes a process comprising steps of drilling a starting hole to a predetermined depth by the use of concrete drills having a prescribed diameter, then driving in an anchor pin, and spreading the top end portions of the anchor pin wider than the inner diameter of the starting hole for retention against draw force. In addition another process includes inserting adhesives and an anchor into a starting hole so as to enable the adhesives to protect the anchor against any draw force for retention.
For example, FIG. 8 shows a conventional anchor pin; FIG. 8(A) is a front view, FIG. 8(B) a central longitudinal section view, FIG. 8(C) a plan view, FIG. 8(D) a bottom plan view, and FIG. 8(E) a front view of the pin.
This particular anchor pin consists of a body 50 and a pin 60. The body 50 is composed of a head 51 provided on an upper base end, and a shank 52 extending from the head 51 downward. The outer diameter of the head 51 is larger than that of the shank 52. The outer diameter of shank 52 is substantially constant in size throughout its entire length.
An opening portion 53 for receiving a pin 60 is formed in the head 51, and the center of the shank 52 to extend from the upper end at the base end portion side to a proper place at the lower end side. The inner diameter of the opening portion 53 has a larger section formed to receive the head 61 of the pin 60 and another section formed constant in size for receiving the shank 62 of the pin 60.
The lower end portion of the shank 52 is formed with a constant length of slit 54 so that it may divide the tip of the shank 52 into two (FIG. 8(D)). The slit 54 extends from the tip of the shank 52 to the opening portion 53.
A plurality of annular grooves 56 are formed in the outer periphery of the top end portion of the shank 52.
The pin 60 which is to be fitted into the opening portion 53 of the body 50 is constituted by a head 61 of larger diameter disposed on the upper base end portion and a shank 62 having a constant outer diameter extending downward. The shank 62 has a tapered lower end portion in the shape of a pointed needle. When this pin 60 is fitted into the opening portion 53 of the body 50 and driven by a hammer etc., the slit-forked top end portions 55, 55 of the body 50 are spread to securely fit the anchor to a structure with a subsequent fixation of a fixture on the structure. FIG. 9 is a schematic illustration showing an exemplar use of said anchor pin. The procedure is as follows.
As illustrated by FIG. 9(A), a starting hole is drilled using an electric drill through metal fittings 66 to be secured to a structure 65 such as concrete etc.
Referring to FIG. 9(B), the anchor pin with the pin 60 fit into the opening portion of the body 50 is placed in said starting hole.
In FIG. 9(C), the pin 60 is driven by a hammer 71.
In FIG. 9(D), the driven pin 60 may induce the spreading of the slit-forked top end port
REFERENCES:
patent: 4322194 (1982-03-01), Eirhorn
patent: 4601625 (1986-07-01), Ernst et al.
patent: 5190425 (1993-03-01), Weider et al.
patent: 5692864 (1997-12-01), Powell et al.
Sato Takayuki
Yamamoto Hisayoshi
Wilson Neill
Yamahiro Co., Ltd.
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