Flexible or portable closure – partition – or panel – Plural strip – slat – or panel type – Venetian blind type
Reexamination Certificate
1999-09-30
2001-02-20
Purol, David M. (Department: 3634)
Flexible or portable closure, partition, or panel
Plural strip, slat, or panel type
Venetian blind type
Reexamination Certificate
active
06189596
ABSTRACT:
BACKGROUND OF INVENTION
a) Technical Field of the Invention
The present invention relates to an improved structure of a driving mechanism for venetian blinds, and in particular, a driving mechanism employing a reinforcement section mounted at the two lateral walls of a fixing seat, and in combination with a lateral wall cord-fixing hole and a blocking section, and a positioning section on a slat control element to ensure that slat control element is positioned at the two lateral walls of the fixing seat.
b) Description of the Prior Art
There are numerous types of driving mechanism for Venetian blinds available in the market. For example, as shown in
FIGS. 6 and 7
, a driving mechanism having a frame body
10
is provided with two groups of fixing seat
20
, and the center of the top section of the two lateral wall
21
is pivotally mounted with a blind slat control element
30
driven by a control shaft
40
. A pulling cord
50
is mounted at the top of the blind slat control element
30
and is used to pull up main cords
51
located at the two sides of the pulling cord
50
. The two main cords
51
respectively pass through the pulling cord hole
220
at the bottom section of the fixing seat
20
, and in combination with the suspension cord
60
, via the suspension cord hole
221
located at the bottom section
22
of the fixing seat
20
to control the up and down movement and angle of variation of the blind slats
70
. A clipping cord
52
is provided in between the two main cords
51
for the mounting of the blind slats
70
.
A hole
71
is provided to the blind slat
70
to allow the passage of the suspension cord
60
. The bottom of the blind slat
70
is provided with a base blind
80
to combine with the suspension cord
60
and the end of the pulling cord
50
as a unit. However, this structure has the following drawbacks:
(a) As the blind slat control slats
70
and the fixing seat
20
often cause friction, and the control shaft
40
is made from metal material while the fixing seat
20
made of plastic material, the rotating of the control shaft
40
being provided with polygonal control shaft
40
will damage the positioning slot
212
and the stopping block
217
. Thus, the stopping block
217
does not provide an effective function.
(b) In the conventional fixing seat
20
, an engaging block
218
is provided to one end of the two lateral walls
21
. Thus, only one end of the engagement can be used and the stability of the fixing seat is limited.
(c) The top section of the lateral walls
21
of the fixing seat
20
is exerted by force. The reinforcement structure at the bottom of the lateral walls
21
used to support the pressure of the control element
30
and the control shaft
40
is not sufficient. Thus, the fixing seat
20
may be deformed.
(d) The pulling of the base slat
80
and blind slats
70
by the suspension cord
60
is not smooth. Due to the direct pulling of the structure, the user requires a stronger force to offset the total weight of the slats
70
and the base slat
80
. Thus, it is not convenient for the weaker user or children to operate the venetian blinds.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved structure of a driving mechanism for venetian blinds, and in particular, a driving mechanism employing a reinforcement section mounted at the two lateral walls of a fixing seat, and in combination with a lateral wall cord-fixing hole and a blocking section, and a positioning section on a blind slat control element to ensure that the slat control element is positioned at the two lateral walls of the fixing seat.
The foregoing objects and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts. Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
REFERENCES:
patent: 3276511 (1966-10-01), Armenia et al.
patent: 5472035 (1995-12-01), Baba et al.
patent: 5538066 (1996-07-01), Liu
patent: 5553653 (1996-09-01), Rozon
A & J
Purol David M.
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