Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Panel hangers – travelers and/or tracks – Wheel mounts
Reexamination Certificate
2001-09-07
2004-01-27
Hartmann, Gary S. (Department: 3671)
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Panel hangers, travelers and/or tracks
Wheel mounts
Reexamination Certificate
active
06681445
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
The present invention generally relates to an improved pulley set for doors and windows.
2. Description of Prior Art
Referring to
FIG. 1
, it shows a conventional pulley set
1
for doors and windows which comprises a housing
10
and a pulley stand
12
with a pulley
11
pivotally installed thereon. The pulley stand
12
is mounted inside the housing
10
to move obliquely along the housing
10
so that the pulley
11
is supported against the window frame. This conventional pulley set is characterized in that engaged in the pulley stand
12
is a nut board
13
which threads with an adjusting screw
14
that is rotatably fixed in the housing
10
and can only rotate at its original place. Rotating the adjusting screw
14
makes the nut board
13
to move relative to the housing
10
, thereby pushing the pulley stand
12
to move obliquely along the housing
10
in order to adjust the height of the pulley
11
with respect to the doors or windows. However, the adjusting screw
14
of the conventional pulley set employs a special screw with a ring slot
140
between the head of the thread portion of the adjusting screw
14
, and a metal plate
15
is engaged with the ring slot
140
. Accordingly, when manufacturing, the adjusting screw
14
must require a process for forming the ring slot
140
, which is not economic. In additions, the nut board
13
is not firmly engaged in the housing
10
and will shake easily when in use.
FIG. 2
shows another conventional pulley set
2
of doors and windows which comprises a housing
20
, a seat
21
, a pulley
22
and an adjusting screw
23
, wherein the middle part of he housing
20
is provided with a pulley install portion
200
and the bottom plane thereof is an inclined plane
201
with an inclined angle and another side of the pulley install portion
200
is provided with an inclined guiding wall
202
with guiding slot
203
therein. The suitable place of the side of the housing
20
has a screw hole
204
for receiving an adjusting screw
23
and a groove
205
in which a washer
24
with the screw hole is inserted. The seat
21
with the pulley
22
pivotally mounted therein has an inclined plane
210
with engaging members
211
and another inclined plane
212
for corporation with the inclined plane
201
of the housing
20
. The side of seat
21
is also provided with an inserting groove
213
for receiving a washer
25
inserted therein. When the seat
21
is installed in the pulley install portion
200
of the housing
20
for cooperating with the inclined plane
201
, rotating the adjusting screw
23
will adjust the height of the pulley set
2
. This conventional pulley set
2
requires inserting grooves
205
and
213
in the housing
20
and the seat
21
respectively for receiving the washers
24
and
25
. However, the washers
24
and
25
made of metal not only increase the cost in manufacture for application but also require electroplating process for avoid rusting. Accordingly, there exits a need for providing an improved pulley set to overcome the problems mentioned above.
The present inventor has been engaged in the development and study of the structures of doors and windows for many years and understands and is familiar with the advantages and shortcomings associated with the conventional art. In views of problems mentioned above, the present inventor proceeded the study of improvement for the above shortcomings and invents an improved pulley set for doors and windows with more practice.
SUMMARY OF INVENTION
The primary object of the invention is to provide an improved pulley set for doors and windows, which is more stable in structure with reduced manufacturing cost
To achieve the above object, the pulley set in accordance with the present invention mainly comprises a base, a set, and adjusting means. The base can be engaged within or mounted on a groove at the bottom portion of doors and windows. The base forms a hollow space for receiving other elements and one side of the hollow space forms a vertical wall having a screw hole and the other side of the hollow space forms an inclined wall. A guiding plane parallel to the inclined wall extends from the vertical wall, and positioning slots are respectively formed in the guiding plane and the inclined wall. On top of the base is formed a clip piece so as to securely mount the base to the bottom of doors and windows. The seat is mounted within the hollow space of the base and both ends of the seat are respectively adjacent to the vertical wall and the inclined wall. The seat has a single or a plurality of pulley installed therein and two inclined planes and corresponding to the inclined wall and the guiding plane. Both the two inclined planes respectively have engaging bodies that can engage with the positioning slots formed in the inclined wall and the guiding plane such that the seat can move along the inclined wall and the guiding plane of the base. The adjusting means can utilize a screw or bolt disposed in the screw hole of the base. The end of the adjusting means will push against the side of the seat such that adjusting the adjusting means will cause the seat to move along the inclined wall and the guiding plane of the base.
When adjusting the height of pulley set relative to the door or window, the user merely rotates the adjusting means in the screw hole of the base. The end of the adjusting means will push against the side of the seat such that adjusting the adjusting means will cause the seat to move along the inclined wall and the guiding plane of the base with he engaging bodies sliding in positioning slots. Accordingly, the height of the pulley set with respect to the base and door or window can be raised lowered.
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patent: 350638 (1886-10-01), Prindle
patent: 350639 (1886-10-01), Prindle et al.
patent: 426390 (1890-04-01), Lane
patent: 438587 (1890-10-01), Richards
patent: 477739 (1892-06-01), Dahmer
patent: 524609 (1894-08-01), Prouty
patent: 2668318 (1954-02-01), le Bon, III
patent: 3443340 (1969-05-01), Helmick et al.
patent: 3656203 (1972-04-01), Waflart, Jr.
patent: 4262451 (1981-04-01), Dallaire
patent: 4404771 (1983-09-01), Murase et al.
patent: 4633615 (1987-01-01), Moose
patent: 5860189 (1999-01-01), An
patent: 5950279 (1999-09-01), Chaput
patent: 6021547 (2000-02-01), Stagoll
Chen Chang Plastics Co., Ltd.
Hartmann Gary S.
Stevens Davis Miller & Mosher LLP
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