Movable or removable closures – Mounted for multidirectional or oblique movement – Swings on plural axes; e.g. – pivotal link arms
Reexamination Certificate
2001-04-20
2002-09-03
Redman, Jerry (Department: 3634)
Movable or removable closures
Mounted for multidirectional or oblique movement
Swings on plural axes; e.g., pivotal link arms
Reexamination Certificate
active
06442898
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an improvement of an opening and closing control mechanism for a project window.
BACKGROUND OF THE INVENTION
The control mechanism for the project window as shown in
FIGS. 1
,
2
,
3
, and
4
which is [fabricated] based on the prior art is very popular. There are two identical controllers mounted on the top and bottom of the project window
10
and fitted in the sash
20
. The project window
10
, by linkage movement of the controllers within the sash
20
, can be pushed outward at a certain angle.
The construction of the controller is briefly discussed below:
The slide frame
30
is in a
form, limiting the slide block
31
to move within the slot. A force arm
32
has a near end pivot
321
located at a far terminal of the slide frame
30
and a far end
322
pivot of the force arm
32
located in the center of carrier arm
33
. A support arm
34
and a connecting arm
35
are superimposed at the pivot
311
located in the slide block
31
. The other end of the support arm
34
is fitted on the pivot
341
located on the central part of the force arm
32
, and the far end of the connecting arm
35
is fitted at the pivot
351
located on near end of the carrier arm
33
. The force arm
32
, the carrier arm
33
and the support arm
34
form an integral linkage that can be folded or extended along the pivots. In the extending movement, the interior of the slide frame
30
provides a stop
36
to limit the movement of slide block
31
thereat. The carrier arm
33
of such well-known controllers is separately installed at the inside of the top and bottom of the project
10
with the slide frame
30
fixed on the top and side of the sash
20
respectively of the project window
10
.
The application principles of this controller are such that the near end pivot
321
of the force arm
32
is located at an outside end within the slide frame
30
which is an immoveable, fixed pivot. The slide block
31
within the slide frame
30
has a moveable pivot. The immoveable and moveable pivots within the slide frame
30
produce a linkage movement to cause the carrier arm
33
to be transversely extended or be vertically cross held within the slide frame
30
.
As shown in
FIGS. 1 and 3
, the project window
10
and the sash
20
are in the [close] closed position. When a force is applied to the right side of and pushes the project window
10
outward, the project window
10
rotates around the pivot
322
. The force applied is transferred to the near end of the carrier arm
33
and further to the connecting arm
35
via the pivot
351
. The slide block
31
is pushed to move to the center of the slide frame
30
. At this moment, the carrier arm
33
extends outward and outside the slide frame
30
and the project window
10
opens outward in
90
degrees. Now in the reverse direction, as shown in
FIGS. 2 and 3
, the project window
10
is being pulled back to close, whereas the project window
10
rotates around the pivot
322
, the pulling force applied is transmitted to the near end of the carrier arm
3
and to the connecting arm
35
by dint of pivot
351
; the carrier arm
33
is therefore retreated and folded on the slide fame
30
as shown in
FIG. 2
, and the project window moves inward to close.
The prior art of the controller presents the technical weaknesses as indicated below requiring improvement:
The overall weight of the project window
10
lies on the carrier arm
33
of the controller. However, the force arm
32
, the support arm
34
and the connecting arm
35
share the weight partially. It is an undeniable fact that when the project window
10
is pushed to wide open position as shown in
FIGS. 2 and 4
, the slide block
31
has to withstand the maximum pulling force with the slide slot of the slide frame
30
with the shape of
. After a very long time in operation, the slide frame
30
will gradually collapse the slot lip. Under such a circumstance, the controller will lose the energy to move smoothly.
Furthermore, the slide block
31
has to shoulder the weight of the project window
10
and moves within the slide frame
30
. Regardless of how intimate the slide block
31
and the slide frame
30
will be, the heavy burden the slide block
31
has to bear makes it difficult to create a smooth linkage movement.
The slide block
31
is a sliding pivot. In the opening operation, the project window
10
will move to the center of the slide frame
30
which impairing the designed openness of the sash
20
, On the contrary, it means the escape space of the sash
20
is narrowed.
Viewing from the aforementioned weaknesses, the inventor has spent relentless effort in observation and research and eventually came up with an improvement of opening and closing control mechanism for the project window to achieve the following objects.
The main object of the invention is to provide a opening and closing control mechanism for the project window where the carrier arm which holds the overall weight of the project window will be installed at the near end of sash and becomes a fixed pivot for easy assembly, opening and close linkage movement with better stability for the project window.
Another object of the invention is to furnish an improved opening and closing control mechanism for the project window with improved open position where the slide frame is fixed on inner side of sash to maintain the desirable open space, easy for escape in the event of an emergent case.
SUMMARY OF INVENTION
This invention relates to an improvement of an opening and closing control mechanism for the project window which mainly comprises a slide frame, a slide block, a retaining block, a pivoted force arm, a carrier arm, a support arm and a connecting arm in an effort to improve the carrier arm which works as a fixed pivot at the near end of sash to be able to bear the pushing load. The retaining block, combined with the slide frame, enhances the structural stability of the sash as well as the smoothness of opening and closing movement.
The improved features of the invention will be discussed in great detail with the aid of some embodiments which are illustrated in the drawings.
REFERENCES:
patent: 4833754 (1989-05-01), Yang
patent: 5040267 (1991-08-01), Dallmann
patent: 5491930 (1996-02-01), La See
patent: 2469540 (1981-05-01), None
Rabin & Berdo P.C.
Redman Jerry
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