Expandable metal body for an expansion bolt

Details Expandable metal body for an expansion bolt Expandable metal body for an expansion bolt

2001-09-19

2003-08-26

Saether, Flemming (Department: 3679)

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

Having separate expander means

Bulged by axially contracting ends

C411S030000, C411S061000, C411S437000

Reexamination Certificate

active

06609866

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to expansion bolts and more particularly to an expandable body of an expansion bolt with improved characteristics.
BACKGROUND OF THE INVENTION
An exploded perspective view of an unfinished expandable body
10
of a conventional expansion bolt is shown in FIG.
1
. Expandable body
10
comprises a metal expansion section
12
including an upper section
122
welded to a nut
11
, a middle section
24
having a plurality of parallel longitudinal slats
124
with an elongate slot
121
disposed between any two adjacent slats
124
, and a lower section
123
welded to a base
13
. Once expandable body
10
is formed, a bolt may insert through base
13
, enclosed by middle section
24
, nut
11
(to form as an expansion bolt), and a piece of object for threadedly securing the expansion bolt to the piece of object. However, the previous design suffered from several disadvantages. For example, the welding processes of nut
11
and base
13
are time consuming and high in manufacturing cost. Further, the structural strength of such welded nut
11
and/or base
13
is not sufficient, resulting in a shortening of the useful life of expansion bolt.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an expansion bolt including a bolt and an expandable metal body comprising an upper section having a hollow upper circular member including a cut and a connection member coupled to the upper section, and a hollow lower circular member including a cut and a dent with the connection member received therein; a middle section having a plurality of parallel longitudinal slots; and a lower section having a plurality of substantially rectangular members on a lower portion. In operation, a piece of object is fastened between lower portion of the lower section and the middle section by driving the bolt in response to an insertion of the bolt through the body and the piece of object. A variety of configurations of upper section and circular members are provided for enhancing the positioning of the expandable body and guiding of the thread of bolt.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.


REFERENCES:
patent: 1208999 (1916-12-01), Malaby
patent: 1293844 (1919-02-01), Malaby
patent: 1295734 (1919-02-01), Greubel
patent: 2762252 (1956-09-01), Karitzky
patent: 3362278 (1968-01-01), Munse
patent: 3385156 (1968-05-01), Polos
patent: 3648335 (1972-03-01), Henning
patent: 4657456 (1987-04-01), Anquetin

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