Metal working – Method of mechanical manufacture – Structural member making
Patent
1989-08-14
1992-07-07
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Structural member making
29512, 29523, B23P 1700
Patent
active
051271605
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application of PCT/EP89/00622 filed Jun. 2, 1989 and based in turn, on German national application P38 15 176 of May 5, 1988.
FIELD OF THE INVENTION
The invention relates to a method fastening construction components in a casing for series-produced finished parts. More particularly the invention relates to a method of temporary fastening of a component sealed off against concrete infiltration in a casing for finished parts, primarily for prestressed-concrete cross ties, whereby a component provided at least indirectly with a central bore is fastened to the inside of the casing by a temporary connection means passing through this bore and through a bore determining the position of the component in a casing plate.
BACKGROUND OF THE INVENTION
In the case of series-produced finished parts of concrete, primarily switch cross ties, for the insertion of the component, e.g. tube sockets for the rail, fastening screws in the case of the switch cross ties--an accuracy is required which greatly exceeds that otherwise necessary for construction components. It is an important condition that the component can be fixed in the casing without being displaced during the pouring of the concrete, that the finished part can be removed from the casing, and that the cost of the required steps is low. Besides, the connection of the component with the casing has to be shearable, in order not to impede the movements occurring between the finished part and the casing during the hardening process of the concrete and not to cause damage to the finished part or to the component.
A fastening method is known from German open application 36 29 030 (see also U.S. Pat. No. 4,948,089). This open application further describes various types of fastening devices, consisting basically of a pin and a fastening nipple. The nipple holds the pin in a bore in the casing plate, which determines the position of the component within the finished part. The hollow pin and the nipple can assume various shapes which sometimes are very complicated and thus expensive, shapes. Sometimes, the nipples can be built into the casing only from the less accessible bottom side.
OBJECT OF THE INVENTION
It is the object of the invention to reduce the time required for the fastening in an accurate position of the components in the casing for series-produced finished parts and to constructively develop the fastening process.
SUMMARY OF THE INVENTION
With regard to the method, the object is achieved in that a blind rivet which can be inserted and hammered in from above is used as a temporary connection means. The rivet is pushed with its stem from above through the bore into a bottom plate indirectly or directly carrying the component as well as through the therewith aligned bore in the casing plate, until the rivet head stops against the bottom plate, up to the point where the lower edge of the component comes to lie flush against the casing plate. The drawing mandrel is then pulled and simultaneously the pull head is pressed into the stem and with the simultaneous deformation of the stem to a rivet-head-like enlargement is solidly anchored on the outside of the casing plate. The preselected breaking point of the drawing mandrel is provided inside the casing plate, suitably immediately behind the pull head. The wall thickness of the stem of the blind rivet is so selected that the blind rivet is sheared off at the occurrence of a shearing stress of a small but definable value, between the correspondingly resistant bottom plate and casing plate. Components to be fastened by the method of the invention can use a blind rivet which can be tightly attached to the casing plate by means of a loose bottom plate provided with a central bore which, with a contact surface, overlaps the projections formed at the bottom edge of the component.
The lower frontal surface of the component can be tightly pressed against the casing plate by the blind rivet, by keeping the portion of the plate thickness
REFERENCES:
patent: 3078002 (1963-02-01), Rodgers, Jr.
patent: 3300798 (1967-01-01), York
patent: 4904133 (1990-02-01), Wright
patent: 4948089 (1990-08-01), Knodel et al.
Dubno Herbert
Eley Timothy V.
Martin C. Richard
Wayss & Freytag Aktiengesellschaft
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