Screw band with washers

Details Screw band with washers Screw band with washers

2003-03-14

2004-11-02

Saether, Flemming (Department: 3677)

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

Washer structure

Including means for retaining washer to fastener

C411S442000, C206S346000

Reexamination Certificate

active

06811366

ABSTRACT:

FIELD OF THE INVENTION
This invention relates a screw band with washers, particularly to one provided with a plurality of screw holes for screws respectively attached with a washer in advance to be fitted through therein. Then each screw hole has a pinching surface, and a connect rib is provided between the pinching surface and the screw band. The screw band further has a plurality of tooth grooves formed in opposite lengthwise sides for teeth of a tool to fit thereinto move the screw band. Each screw has its shank fitted around with the washer and contacts with a lower surface of the screw band. Then the washer can have a diameter larger or smaller than that of the head of the screw, enabling the screws on the screw band driven just vertically in an object.
BACKGROUND OF THE INVENTION
A conventional screw band with washers shown in
FIGS. 1
,
2
and
3
includes a screw band
1
, a plurality of screws
2
respectively fitted through a screw hole with its shank
20
closely contacting with its side surface
10
, and then a clamp band
11
is then pushed out by a process machine to surround half of the threads
200
of each screw along with the screw band
1
. Then a washer
3
is fitted around the shank of each screw
2
, located very near the tip
21
of the screw and around the lower portion of the shank
20
so that if the screw
2
is inclined at the moment of driven by an electric or a pneumatic tool, the inner surface
30
of the washer
3
may rub against the surface of an object as shown in
FIG. 3
, and become not flat and impossible to prevent moisture from percolating in the object.
Next, the friction between the washer
3
and the surface of an object presents a hindrance for the screw
2
in driving operation in the object.
SUMMARY OF THE INVENTION
The object of the invention is to offer a screw band with washers, which have the washers possible to let the screw driven smoothly in an object, without any friction between the washer and the object.
The feature of the invention is the washer and the head of each screw sandwiching the screw band to keep each screw strictly vertical to the screw band so as to be driven correctly in an object.


REFERENCES:
patent: 3394747 (1968-07-01), Duffy
patent: 3452636 (1969-07-01), Cohen et al.
patent: 3892313 (1975-07-01), Lange
patent: 4930630 (1990-06-01), Habermehl
patent: 5542323 (1996-08-01), Habermehl et al.
patent: 6036013 (2000-03-01), Chen
patent: 6116835 (2000-09-01), Blacket et al.

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