Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Hook head – e.g. – j-bolt – etc.
Patent
1994-05-10
1995-08-08
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Hook head, e.g., j-bolt, etc.
411 29, 411387, 811242, 8117615, F16B 2300, F16B 2500, B25B 1300
Patent
active
054393388
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an anchorage arrangement for e.g. anchoring of scaffolds at walls or the like, which arrangement consists of a screw socket and an anchor bolt.
BACKGROUND
When mounting scaffolds the scaffold must be anchored in a safe way. This is done by securing the scaffold at a large number of points by anchor bolts screwed into the wall at which the scaffold is mounted. Today this is normally done by first drilling a hole in the wall, and then hammering a plug into said hole, whereafter the anchor bolt is screwed in manually in the the wall in order to anchor the scaffold. It is both a tiresome and time consuming to manually screw in the anchor bolts.
The concern of the invention is the large strains, specially in the shoulders, experienced by scaffolders in presently used manual method to screw in anchor bolts. It has been found in practice that the installers, due to being pressed for time, often are careless with the important anchoring, as it is both time consuming and tiresome to screw in anchor bolts in the prescribed number. Of course this is unacceptable from the view point of security.
The use of the anchorage according to the invention is not limited to scaffolds but can be used anywhere when some kind of anchorage arrangement is needed. Examples of other fields of use are railings, fences, wire carriers, fireladders and lifting eye bolts for e.g. rocks.
SUMMARY OF THE INVENTION
Thus, the object of the present invention is to facilitate to screw in the anchor bolts by making it possible to use an ordinary drilling machine for the actual screwing in.
This object is met with an anchorage arrangement an anchor bolt cooperating with a socket furnished with an insert pin for connection with a drilling machine or the like, the socket having a cruciformed inner recess furnished with chamfers formed at each of the inner corners of the recess and decreasing inwardly in the socket, the chamfers cooperating with an extension in the form of a cone on the anchor bolt.
When using the arrangement according to the invention the socket is placed in a drill chuck, or other suitable rotary drive means, in the normal way. In the inner cruciformed recess, the eye of the cone on the anchor bolt fits. Furthermore, the anchor bolt has a corresponding form to that of the chamfers on the recess within the socket. The cone and chamfers partly act to guide the application of the socket on the anchor bolt and partly to hinder the stem of the anchor bolt from striking against the parts of the socket during the screwing operation.
In schaffold mounting the normal distance from the plank platform on which one stands at the mounting of the anchor bolts and the hole in which the anchor bolt is to be screwed in is about 2 m, which gives a cumbersome working posture with large strain particularly on the shoulder 3 during the presently used method of manually screwing in anchor bolts. This work is facilitated by the invention by which one can use the some drilling machine for both screwing in of the anchor bolts and to drill the holes in the wall in which the anchor bolts are screwed in. By using a drilling machine the bolts are screwed in with a greater force, which expands the plugs in the wall more and gives a stronger anchoring. Due to the cruciformed recess of the socket with chamfering and the cone of the anchor bolt it is fast and easy to screw in the bolts without the bolt stem striking against the socket. This becomes more important if the scaffold, as often happens with additional insulation, is mounted at a relative large distance from the walls whereby long anchor bolts must be used. Without the chamfers and the cone it would be very difficult to screw in the anchor bolts without them striking against the socket. Furthermore it is a clear risk that the anchor bolts will strike so much that they affect the hole in the wall.
When sheeting the scaffold, i.e. covering it with plastics, almost twice as many anchor bolts must be used due to the surface exposed to the wind.
REFERENCES:
patent: 316650 (1885-04-01), Perkins
patent: 842933 (1907-02-01), Bement
patent: 1188305 (1916-06-01), Noerteman
patent: 2231323 (1941-02-01), Cawood
patent: 3151512 (1964-10-01), Charczenko
patent: 3354756 (1967-11-01), Rusk
patent: 4275621 (1981-06-01), Mallott, Sr.
patent: 4689881 (1987-09-01), Fall
patent: 4764069 (1988-08-01), Reinwall et al.
Patent Abstracts of Japan, vol. 13, No. 498, M890, abstract of JP 01-199774, publ. 1989-08-11 (Matsushita Electric Ind. Co. Ltd.).
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