Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Roll type
Reexamination Certificate
1999-11-16
2001-06-05
Lev, Bruce A. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Roll type
C160S271000, C160S310000, C074S356000, C016S09500R, C198S803120
Reexamination Certificate
active
06240997
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a rolling steel door, and more particularly to a light structure of rolling steel door, which needs less storage space when rolled up.
FIGS. from
7
through
10
show a rolling steel door
2
according to the prior art. This structure of rolling steel door comprises a plurality of solid metal transverse rods
23
, a plurality of sleeves
22
respectively sleeved onto the metal transverse rods
23
, and a plurality of links
21
respectively coupled to the metal transverse rods
23
to hold the metal transverse rods in parallel. The links
21
are oblong metal plates, each comprising two remote ends
211
, and two coupling holes
212
respectively formed on the two remote ends
211
and coupled to a respective metal transverse rod
23
. The links
21
are arranged in sets. Each set of links
21
include two pairs of first links respectively coupled between two adjacent pairs of metal transverse rods, and one second link coupled between the adjacent metal transverse rods of the two adjacent pairs of metal transverse rods being connected to the pairs of first links and retained between the pairs of first links. This structure of rolling steel door is still not satisfactory in function. The drawbacks of this structure of rolling steel door is outlined hereinafter.
1. Because the links
21
are flat members, the contact area between each coupling hole
212
and the corresponding metal transverse rod
23
is limited, and the metal transverse rods
23
tend to be damaged by the coarse border area of each coupling hole
212
. Because the metal transverse rods
23
tend to be damaged by the coarse border area of each coupling hole
212
, the metal transverse rods
23
must have a solid structure.
2. Because the metal transverse rods
23
are solid metal rods, the manufacturing cost and total weight of the rolling steel door are high, and a high capacity of motor, which consumes much electric power, must be used to move the rolling steel door. In case of a power failure, much effort must be employed to take up the rolling steel door manually.
3. Because the links
21
are flat members, they tend to be forced to vibrate when moving taking up or letting off the rolling steel door, thereby causing a high noise level to be produced (see FIG.
9
).
4. Because the links
21
are flat members, the rolled diameter D
1
of the rolling steel door cannot be minimized when rolled up about a spooling structure
213
, i.e., a spacious receiving chamber must be provided to receive the rolling steel door when the rolling steel door is rolled up.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a rolling steel door, which eliminates the aforesaid drawbacks. According to one aspect of the present invention, the rolling steel door comprises a plurality of transverse tubes, a plurality of sleeves respectively sleeved onto the transverse tubes, a plurality of links respectively coupled to the transverse tubes to hold the transverse tubes in parallel, and a plurality of locating pins respectively fastened to the transverse tubes to stop the sleeves against the links, wherein the transverse rod members are hollow tubes; the links each comprise two coupling ends, two coupling holes respectively formed on the coupling ends and coupled to a respective transverse rod member. Because transverse tubes are used instead of solid rod members, the total weight of the rolling steel door is minimized, and a less capacity of motor can be used to move the rolling steel door efficiently. According to another aspect of the present invention, each link comprises a reinforcing peripheral flange perpendicularly raised around the periphery and the border of each coupling hole. The reinforcing peripheral flange greatly reinforce the structural strength of the link, and relatively increases the contact area between each coupling hole and the respective transverse tube, enabling the rolling steel door to be smoothly and stably moved. According to still another aspect of the present invention, each link has a neck on the middle. When the rolling steel door is rolled up, the coupling end at one end of one link is closely attached to the neck at another link, therefore the diameter of the rolled up rolling steel door is minimized, i.e., less storage space is needed to receive the rolling steel door when the rolling steel door is rolled up.
REFERENCES:
patent: Re. 28746 (1976-03-01), Bruce
patent: 1985828 (1934-12-01), Himmelmann
patent: 2095690 (1937-10-01), Brunst
patent: 2167875 (1939-08-01), Cornell et al.
patent: 2245079 (1941-06-01), Pejchar
patent: 2898988 (1959-08-01), Zoll
patent: 2940520 (1960-06-01), Cookson, Jr. et al.
patent: 3899873 (1975-08-01), Fink
patent: 4050750 (1977-09-01), Yoshihashi et al.
patent: 4058351 (1977-11-01), Murphy
patent: 4083611 (1978-04-01), Schaffner et al.
patent: 4501351 (1985-02-01), Tracy
patent: 4590758 (1986-05-01), Hannig et al.
patent: 4880108 (1989-11-01), Burk
Lev Bruce A.
Rosenberg , Klein & Lee
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