Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
2000-07-18
2001-05-29
Purol, David M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
C160S319000
Reexamination Certificate
active
06237669
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tilt cord controller for venetian blinds, e.g., vertical venetian blinds, for preventing damage to transmission elements due to excessive pulling force acting on the tilt cord.
2. Description of the Related Art
FIG. 1
of the drawings illustrates a tilt cord controller for venetian blinds for controlling tilt angle of the blind. The tilt cord controller includes a casing
21
consisting of two casing halves
211
and
212
, wherein casing half
212
includes a tubular member
213
for rotatably holding a rotating member
214
, and casing half
211
is used to rotatably support a pulley
22
around which a tilt cord (not shown) is wound around. The pulley
22
includes a stud
221
with annularly spaced longitudinal ridges
222
formed on an outer periphery of the stud
221
. The rotating member
214
includes a plurality of annularly spaced grooves (not shown) in an inner periphery defining a longitudinal hole
215
thereof for securely engaging with the ridges
222
. Thus, pulling of the tilt cord causes rotation of the pulley
22
, which, in turn, drives the tilt rod (not shown) via transmission by the rotating member
214
. Nevertheless, it is found that the pulley
22
and the rotating member
214
and other transmission elements are damaged easily if the tilt colt is pulled by an excessive force which still forces the tilt rod to turn although the tilt rod has reached its end position. Longevity of the tilt cord controller is thus shortened.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a tilt cord controller for venetian blinds for preventing damage to transmission elements due to excessive pulling force acting on the pull cord, thereby preventing shortening of longevity of the tilt cord controller.
A tilt cord controller in accordance with the present invention comprises:
a casing;
a rotating member rotatably mounted in the casing;
an axle including a first end with an end face and a second end, the second end of the axle being securely engaged with the rotating member to rotate therewith, the end face of the first end of the axle including a slit such that the first end of the axle is compressible inward, the end face of the first end of the axle further including a receptacle;
a bumping member mounted in the receptacle of the first end of the axle;
a pulley mounted around the first end of the axle to rotate therewith; and
a tilt cord mound around the pulley.
The first end and the second end of the axle have different diameters to form a step therebetween. The bumping member is a spring or made from rubber.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4224973 (1980-09-01), Hugin
patent: 4836345 (1989-06-01), Anderson
patent: 5293921 (1994-03-01), Marocco
patent: 5636677 (1997-06-01), Liu
Purol David M.
Rosenberg , Klein & Lee
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