Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – With hole forming means
Patent
1984-04-09
1986-03-11
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
With hole forming means
175287, 175289, 408144, 408170, 408180, 411 54, 411 77, F16B 1306
Patent
active
045752940
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an anchoring bolt by which a conical undercutting can be produced when it is driven like a drill bit into a cylindrical hole, the anchor bolt having a connecting portion, a shaft and an insertion portion, the latter having an axially extending slot forming two spreadable branches, into which slot an axially movable spreading wedge is inserted by its tapered end, and having, on the end of the insertion portion away from the shaft, at least two inserts lying radially opposite to each other.
BACKGROUND AND PRIOR ART
Such an anchoring bolt is described in the as yet unpublished patent application P No. 31 39 174.5-12 of the assignee of this application and serves simultaneously as a securing element and as a drill bit or reamer. The inserts, by which reaming of the bore walls is obtained when the insertion portion is put down over the spreading wedge, are set at right angles to the longitudinal axis of the anchoring bolt in the case of the known anchoring bolt and they are located diametrically opposite each other.
SUMMARY OF THE INVENTION
Proceeding from this state of the art, the invention has the object of providing an anchoring bolt of the above-mentioned kind which utilizes the cutting effect of the hard metal inserts optimally and produces an undercut that optimally corresponds to the spreading angle produced by the wedge at the insertion end of the anchoring bolt.
This object is attained according to the invention by disposing the inserts obliquely with respect to the axis of the bolt at the end face of its insertion portion and by the fact that their edges facing forward in the direction of rotation project outward farther than the edges facing rearward with respect to the rotation direction.
Because of the fact that the forward cutting edges project farther out, it is these edges which mainly produce the reaming out of the bore walls. They produce a clearance angle that prevents scraping of the edges facing rearward and accordingly leads to a reduction of the cutting resistance and trouble-free displacement of the cuttings.
The inserts are preferable cylindrical hard metal pins of round section shape which are set in seating bores which extend at an angle of inclination of about 60.degree. to the direction of the bolt axis. In a preferred embodiment of the invention the end face of the insertion portion is formed as a slotted cone frustum from the conical surfaces of which the hard metal pins project, the frustum being divided into two parts by the slot. The hard metal pins are offset by a certain amount in the direction of rotation on opposite sides of a first plane that passes through the longitudinal axis of the insertion portion of the anchoring rod and extends at right angles to the slot. The longitudinal axes of the hard metal pins lie respectively in a second and a third plane at a spacing from the first plane corresponding to the offset.
An efficient utilization of the cutting edges results when the hard metal pins are imitially adhesively bonded into the seating bores in such a way that they can turn on their own axes during the drilling process for shaping out the undercut.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further explained by way of an illustrative embodiment with reference to the drawing, in which:
FIG. 1 is a side view of the anchoring rod, partly in section,
FIG. 2 is an end view of the end face of the insertion end of the anchoring rod according to FIG. 1,
FIG. 3 shows the front end of the insertion portion of the anchoring rod, in a side view and
FIG. 4 shows the bottom of the bore hole, in a median vertical section joining at the bottom with a horizontal section, and so as to provide a schematic oblique view of a sectioned off tip of the anchoring bolt, inserted in the hole and already spread, although not showing the wedge, illustrating.
DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
The anchoring bolt, designated 1 as a whole consists essentially of a threaded rod and has a connection portion to a threading-free setting depth marking s
REFERENCES:
patent: 833240 (1906-10-01), Potter
patent: 1281519 (1918-10-01), clark
patent: 1762349 (1930-06-01), Phillips
patent: 2511650 (1950-06-01), Robinson
patent: 2650476 (1953-09-01), Crockett
patent: 2692758 (1954-10-01), Curry et al.
patent: 2697914 (1954-12-01), Joy
patent: 2963935 (1960-12-01), Shields
patent: 3202035 (1965-08-01), Rosselet
patent: 4091882 (1978-05-01), Hashimoto
patent: 4518290 (1985-05-01), Frichmann et al.
Frischmann Albert
Mermi Kurt
Sternisa Danilo
Holko Thomas J.
Upat GmbH & Co.
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