Automatic bounce device for a center stick in a pen

Details Automatic bounce device for a center stick in a pen Automatic bounce device for a center stick in a pen

2000-02-24

2001-03-13

Eloshway, Charles R. (Department: 3751)

Coating implements with material supply

Projectable and retractable tool

Clasp associated with project-retract means or with latch

C401S109000

Reexamination Certificate

active

06200050

ABSTRACT:

BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to an automatic bounce device for a center stick in a pen, and particularly to a bounce device, with which a push part is provided at an opening end of a hollow pen holder. Thus, a nib part of a standardized center stick in the pen holder can be exposed for writing from a state of concealing in the pen holder by way of pressing the push part.
(b) Description of the Prior Art
A conventional bounce type of center stick in a pen is widely adopted in our daily life. As shown in
FIG. 1
, a prior art automatic bounce device for a center stick in a pen provides a hollow pen holder A
10
and a head end of the pen holder A
10
has attached a clip A
11
extending outwardly therefrom. The clip A
11
at an end thereof has an engaging projection A
12
jutting out from an inner side thereof. A locating hole A
13
is provided on the pen holder A
10
corresponding to the projection A
12
. A lock hole A
14
is located at a place near the lock hole A
13
on the pen holder A
10
. In addition, the pen holder A
10
receives a center stick A
15
and the center stick A
15
has a nib part A
16
at an end thereof. A pair of flips A
17
are opposite to each other and disposed near the nib part A
16
on the center stick A
15
. A restore spring A
18
is placed in the pen holder A
10
around the center stick A
15
by the flips A
17
. The other end of the center stick A
15
contacts with a bounce device A
20
and the bounce device A
20
has a push head A
21
to extend outward from the head end of the pen holder A
10
to be pressed while in use. Furthermore, a touch post A
22
on the bounce device A
20
extends inward and a leaf spring hook A
23
is attached to the touch post A
22
in a slightly outward inclination to fit a inverse hook thereof with the lock hole A
14
.
Once the above said components of the prior art bounce device are assembled completely, the leaf spring hook A
23
moves away from the lock hole A
14
and slides into the locating hole A
13
when pressing the push head A
21
. In this way, the nib part A
16
of the center stick A
15
is forced to an exposed position outside the pen holder A
10
. Having been pressed, the clip A
11
has the projection A
12
thereof to push the leaf spring hook A
23
and to move from the locating hole A
13
, and a resilient force of the restore spring A
18
moves the center stick A
15
with the leaf spring hook A
23
upward. In this way, the leaf spring hook A
23
engages with the lock hole A
14
again. However, the prior art bounce device has the following drawbacks:
1) The center stick applied in the prior art bounce device has a length limited by the length of the pen holder and by a room in the pen holder for receiving the bounce device. Therefore, the length of the center stick is shorter than a standard length (about 14 centimeters) used in an ordinary cap type pen such that a special size for the center stick used in the bounce type pen has to be made.
2) Owing to a shorter center stick, the ink contained therein is less and it results in a writing span is limited to about 1,500 meters. Thus, a utilized period becomes shorter such that it is unable to compete with the standard sized center stick. (The writing span for the standard sized center stick is around 2,500 meters.)
3) The prior art bounce device has to be fixed in the pen holder in contact with the center stick. It is not easy to be assembled and it results in a higher production cost.
The above drawbacks leads to a pen provided with the prior art bounce device having a higher price such that it is not as popular as the conventional cap type pen even if the cap on the conventional pen is lost frequently while in use. Therefore, a revised bounce device has to be developed so as to allow the length of a center stick in a pen to be identical with a standardized center stick used in the conventional cap type pen and to allow the device being simply assembled. Then, the requirements such as lengthening the writing span and lowering the production cost can be met advantageously.
SUMMARY OF THE INVENTION
An automatic bounce device for a center stick in a pen in accordance with the present invention comprises a pen holder, a center stick, a resilient part, and a push part. The characteristics of the automatic bounce device resides in that the push part is provided at an opening end of the pen holder and the push part is composed of an upper cap and a lock key tube. The upper cap movably fits with and encloses the opening end and a clip extends from the upper cap. A free end of the clip has a projection jutting out of an inner side thereof corresponding to a locating hole on the pen holder. The key tube is closed at an end thereof and sleeved in the opening end with part of the length thereof extending out of the pen holder. An elastic inverse hook part with an engaging hook is provided on the key tube and the center stick at an end thereof is received in the key tube and keeps contact with the closed end of the key tube. When the key tube is pressed, the engaging hook on the elastic hook part moves away an engaging hole on the pen holder and slides into the locating hole. In the mean time, the center stick is pushed to expose a nib part at another end thereof outside the pen holder and the center stick is caused to buckle. When the clip is pressed, the projection thereon pushes the engaging hook away the locating hole and the center stick and the key tube are moved back by way of the elasticity of the resilient part and the flexibility of the buckled center stick. Thus, the engaging hook is then received in the engaging hole again.
Accordingly, an object of the present invention is to provide an automatic bounce device for a center stick in a pen with which a conventional standardized center stick can be used such that a longer useful writing span can be reached without any difficulty.
Another object of the present invention is to provide an automatic bounce device for a center stick in a pen with which a conventional standardized center stick can be used without the need for a special size to ease a replacement of the center stick.


REFERENCES:
patent: 5688063 (1997-11-01), Yu et al.
patent: 65642 (1956-02-01), None
patent: 1178230 (1959-05-01), None
patent: 1336207 (1963-07-01), None
patent: 1351513 (1963-12-01), None

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