Sandwich type expansion bolt

Details Sandwich type expansion bolt Sandwich type expansion bolt

2001-03-02

2002-11-05

Saether, Flemming (Department: 3679)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Multipart

C411S045000

Reexamination Certificate

active

06474920

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to expansion bolts and, more specifically, to a sandwich type expansion bolt, which comprises two bolt halves with an insert block sandwiched in therebetween, and a nut threaded onto the bolt halves to secure the bolt halves to the hole of the object into which the bolt halves are inserted.
PRIOR ART OF THE INVENTION
A regular expansion bolt, as shown in
FIG. 1
, comprises a socket
1
, a screw bolt
2
threaded into the socket
1
. The socket
1
has an internally threaded body
10
, and a split
12
in the expanded rear end thereof. After insertion of the socket
1
into a hole in an object
3
, the threaded shank
20
of the screw rod
2
is threaded into the internally threaded body
10
of the socket
1
to expand the split rear end of the socket
1
, causing the socket
1
to be firmly secured to the object. This structure of expansion bolt can only support a small object that has less gravity weight. If the expansion bolt is used to support a heavy object, for example, a stone material on the outside wall of a building, the object may fall from the socket
1
and the screw bolt
2
to hit passers-by accidentally.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a sandwich type expansion bolt, which eliminates the aforesaid problem. According to one aspect of the present invention, the expansion bolt comprises two symmetrical bolt halves, the bolt halves each having an inner side, and outer side, a front end, a rear end, and outer threads provided at the outer side for the mounting of a nut, an insert block inserted in between the bolt halves after the bolt halves have been attached together and inserted into a hole on an object, and a nut threaded onto the outer threads of the bolt halves to secure the bolt halves to the hole of the object into which the bolt halves are inserted. According to another aspect of the present invention, positioning means is provided to prevent the insert block from falling out of the bolt halves.


REFERENCES:
patent: 1087759 (1914-02-01), Gould
patent: 2352297 (1944-06-01), Wales
patent: 2693732 (1954-11-01), Durst
patent: 2836095 (1958-05-01), Devine
patent: 2892376 (1959-06-01), Schonfeld
patent: 3096679 (1963-07-01), Jones
patent: 4478546 (1984-10-01), Mercer
patent: 5090857 (1992-02-01), Dunn

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