Joints and connections – With indicator or inspection means
Patent
1991-12-04
1993-02-23
Kundrat, Andrew V.
Joints and connections
With indicator or inspection means
403 43, 403 44, B25G 300
Patent
active
051884739
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a bar anchor arrangement for bars and eye bars which are subject to tensile stress, whereby the bar anchor consists of a bar anchor body with a bore with internal thread for screwing in a tension bar provided with an external thread as well as of two parallel eye plates adjoining the anchor body to accommodate an eye bar.
Such bar anchor arrangements have been known for a long time.
The problem of these arrangements is that it must always be ensured that the tension bar is screwed into the internal thread of the bar anchor up to the minimum screw-in length under all circumstances.
It was attempted to solve this with a design where a check bore was provided in the bar anchor body perpendicular to the longitudinal axis through which it was possible to establish the required minimum screw-in length of the tension bar into the internal thread of the anchor. This arrangement is shown by DE-U 87 07 293.
Although this solution from the applicant and inventor has already been used successfully in building construction (Bieberach Technical University), it did not appear fully satisfactory. The check bore always results in an undesirable weakening of the cross-section, even if the edge zones of the check bore are reinforced by a bead.
In addition, such a check bore on a bead-type reinforcement does not look attractive. In addition, no tolerance ranges could be established with this check bore.
The task of the invention was to create a bar anchor arrangement of the type mentioned above where it is guaranteed in all cases that the required minimum screw-in length can be observed. In addition, it should also be able to establish the minimum screw-in length with a positive or negative tolerance in all cases.
The invention will now be explained in further detail on the basis of a realized example in conjunction with the enclosed drawing.
The drawing shows the following:
FIG. 1a A schematic top view of the bar anchor with tension bar in accordance with the invention;
FIG. 1b A schematic top view of a section of the tension bar and
FIG. 2 A cross-sectional view of the bar anchor arrangement in accordance with the invention.
FIG. 1a shows a bar anchor 1 with an anchor body 2, which possesses two adjoining eye plates 3 into which the eye bolt 4 shown in FIG. 2 can be inserted. The bar anchor 2 possesses a bore in which an internal thread 5 is provided. The dimensions of this internal thread will be described below.
A smooth bore tolerance compensating section 6 is provided at the outer end of the bore. A further tolerance compensating section 7 is preferably also provided on the other side of the internal thread, as shown in FIG. 2.
A tension bar 8 can be screwed into the internal thread 5 of the bore in the bar anchor 2 by means of an external thread 9. In this context, it must be mentioned that these tension bars possess a turnbuckle character, i.e. that a right-hand thread is provided at one end and a left-hand thread at the other, not-shown, end. Equally, there are then bar anchors with right-hand and left-hand internal threads. As shown in FIG. 2, an eye bar 10 can be inserted between the two eye plates 3 which is then held by the eye bolt 4. This in turn is prevented from slipping out by a Seeger circlip ring 11.
The dimensions of the individual threads are of particular importance.
Finally, FIGS. 1a and 1b also show a recess 12, which is preferably made onto opposing sides of the tension bar, thus facilitating screwing-in of the tension bar into the bar anchor.
The dimensions of the individual threads and tolerance compensating sections are chosen so that the minimum screw-in length of the external thread 9 into the internal thread 5 of the bar anchor 2 is reached at least when the tension bar is screwed in so far that the thread can no longer be seen. In other words, the length of the external thread 9 of the tension bar 8 and also the length of the internal thread 5 of the bar anchor 2 essentially correspond to the minimum screw-in length plus the length of a tolerance compensating section 6
REFERENCES:
patent: 1226830 (1917-05-01), Walker
patent: 1683516 (1928-09-01), Adams
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