Guiding block for pulling a window curtain

Details Guiding block for pulling a window curtain Guiding block for pulling a window curtain

1999-02-18

2001-02-20

Mah, Chuck Y. (Department: 3626)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Panel hangers, travelers and/or tracks

With flexible panel attaching means

C016S091000, C016S106000, C016S107000

Reexamination Certificate

active

06189182

ABSTRACT:

BACKGROUND OF THE INVENTION
In general, window curtains are used in buildings for shielding sunlight and protecting the private things. Moreover, the window curtains also have the effects of beautifying the environment.
In a general window curtain, curtain cloth slides along a sliding track for opening and closing the window curtains. The sliding operation is primarily induced from the rolling wheels on the top edge of the window curtain and the rolling wheels roll along a sliding track. Moreover, the movement of the rolling wheel is guided by a guide block.
Referring now to
FIG. 6
, the guide block (
1
) of prior art comprises the following components:
A pulling plate (
11
): A toggle (
111
) is on the upper portion of the pulling plate (
11
). A hanging plate (
112
) is on the lower rim of the toggle (
111
). A hanging hole (
113
) is on the distal end of the hanging plate (
112
) for being hooked by the hanging pin on the upper portion of the window curtain (
3
) A left rib (
114
) and a right resisting plate (
115
) are installed on the inner rims of the left and right end surfaces of the toggle (
111
) of the hanging plate (
112
).
A left wheel seat (
12
): a left spacer (
121
) with a through hole on the center thereof is the primary body. The left spacer (
121
) has an outer diameter slightly larger than the inner diameter of the left ribs (
114
) of the toggle (
111
). One side of the left spacer (
121
) is extended to form a convex tube (
122
). Another side of the left spacer (
121
) is extended to form a left rolling wheel (
123
). The left side of convex tube (
122
) on the left wheel seat (
12
) is inserted into the hole (
116
) of the toggle (
111
). The left spacer (
121
) is enforced into the left rim (
114
) by the elastic property thereof for combining the pulling plate (
11
).
A plurality of rolling balls (
13
): The rolling balls (
13
) are located above the left spacer (
121
) ofthe outer rim of the convex tube (
122
) on the left wheel seat (
12
).
A right wheel seat (
14
): the right spacer (
141
) with a through hole on the center thereof is the primary body of the right wheel seat (
14
). The outer diameter of the right spacer (
141
) is slightly larger than the inner diameter of the right resisting plate (
115
) of the toggle (
111
). One side of the right spacer (
141
) is extended to form as a convex tube (
142
). The outer diameter of the convex tube (
142
) is slight smaller than the inner diameter of the convex tube (
122
) of the left wheel seat (
12
). Another side of the right spacer (
141
) is extended as a right rolling wheel (
143
).
The convex tube (
142
) of the right wheel seat (
14
) is inserted into the hole (
116
) of the toggle (
111
) through the right side of the toggle (
11
). The right spacer (
141
) is enforced into the inside of the right rib (
115
) for combining a pulling plate (
11
). The convex tube (
142
) of the right wheel seat (
14
) is exactly inserted into the inner rim of the convex tube (
122
) of the left wheel seat (
12
) for combining the left wheel seat (
12
).
By the rolling of the rolling balls (
13
), the rotations of the left and right rolling wheels (
123
) and (
143
) becomes more smooth and the friction in rotation can be reduced.
However, the prior art design still has the following disadvantages:
1. The friction and collision between two rolling balls (
3
) occurs as the rolling ball is rolling. This will induce the wearing of the rolling balls.
2. The rotation of the rolling ball is retarded.
3. As the rolling balls (
3
) collide with one another, noises will generate.
4. Although the convex tube (
142
) of the right wheel seat (
14
) is enforced into the inner rim of the convex tube (
122
) of the left wheel seat (
12
) for combining the left wheel seat (
12
), However, this combination still depends upon the character of the materials, therefore, the stability thereof is insufficient.
5. A left rib (
114
) and a resisting plate (
115
) are extended from the inner rim of the left and right end surfaces of the pulling plate (
11
) so that after the left and right spacer (
121
) and (
141
) of the left and right wheel seat (
12
) and (
14
) enter into the ring hole (
117
) of the pulling plate (
11
), the gap therebetween is too large, thus, the left and right spacers (
121
) and (
141
) easily loosen.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made to overcome the above-mentioned problems.
The primary object of the present invention is to provide a guiding block for pulling a window curtain comprises a pulling plate, a left wheel seat, a plurality of rolling balls, and a right wheel seat. A confining cap is formed between the right wheel seat and the rolling balls. The primary body of the confining cap is a circular plate with a through hole on the center thereof. Claws with respective to the gaps between each two rolling balls are axially extended from the circular plate on the inner side of the confining cap. Not only the rolling action is smooth, but also the friction and collision between two rolling balls is prevented. Other then noises from frictions and collisions are reduced, the lifetime of the window curtain is prolonged. The circular groove of the convex tube on the right wheel seat is enforced into the rib on the inner rim of the convex tube on the left wheel seat so as to form a buckling state for combining the left wheel seat. Thus, sliding therebetween is seldom occurred and the stability of the combination thereof is increased. The left and right ribs and are circularly installed within the toggle of the pulling plate. After the left spacer and the right spacer enter into the hole of the pulling plate, they will be confined between the left and right ribs and difficult to release therefrom.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.


REFERENCES:
patent: 3076222 (1963-02-01), Sloan
patent: 3293685 (1966-12-01), Rosenbaum
patent: 3553765 (1971-01-01), Frost
patent: 4049308 (1977-09-01), Martin
patent: 4229857 (1980-10-01), Toder
patent: 5014392 (1991-05-01), Melara
patent: 5749661 (1998-05-01), Moller
patent: 5924800 (1999-07-01), Obara et al.

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