Coating implements with material supply – Including ball – roller or endless-belt tool – Ball
Reexamination Certificate
2000-05-03
2001-04-24
Huson, Gregory L. (Department: 3751)
Coating implements with material supply
Including ball, roller or endless-belt tool
Ball
C401S209000
Reexamination Certificate
active
06220774
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ballpoint tip for a ballpoint liquid container, such as a ballpoint refill using a ball as a writing medium.
2. Description of the Related Art
Most factors that determine the performance of a ballpoint liquid container for a ballpoint pen or the like are dependent on the accuracy of a ballpoint tip. A 0.7 mm diameter ball needs to rotate 44.5 full turns for drawing a line of only 10 cm, and a 0.5 mm diameter ball needs to rotate as many as 63.7 full turns for the same purpose at a very high rotating speed. Therefore, it is a very important problem with the ballpoint tip of this kind to prevent the abrasion of the ball friction necessarily caused by the high-speed rotation of the ball and the corrosional deterioration of the ball caused by static electricity generated by the high-speed rotation of the ball that occur as a logical consequence of the high-speed rotation of the ball, and to maintain the ability of the ball. If the ballpoint tip has problems in construction and accuracy, there is the possibility that “seepage” or “blotting” of the ink occurs.
A liquid applying implement disclosed in Japanese Utility Model provisional Publication No. Hei 5-76568 is an example of a ballpoint tip for a liquid container, such as a ballpoint refill of this kind. Referring now to
FIG. 1
, the liquid applying implement has a highly flexible liquid tank
14
, and a ballpoint tip
12
provided with a ball
11
and connected to the liquid tank
14
by a connecting member
13
and a press-fit cylindrical member
17
. The tank
14
contains a film-forming liquid of a high viscosity. The ball
11
is held for rotation in a forward end part of a body member of the ballpoint tip
12
so as to be partly exposed. A movable pin
15
having a small mass is placed in the body member of the ballpoint tip
12
, and a spring
16
is compressed in the body member so as to push the movable pin
15
forward to press the ball
11
against the inner surface of the forward end part of the body member.
These prior art techniques applied to control a liquid, such as a gel employed in a gel ballpoint pen or a covering liquid use a ball pressing means including the movable pin formed by molding a resin, and a coil spring. These parts are difficult to assemble, springs have tendency to become tangled with each other when the pitches of the coils is greater than twice the diameter of the spring wire, and hence an automatic assembling machine cannot be used for assembling those parts, and the gel ballpoint pens or the like cannot be mass-produced.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to solve the foregoing problems in the prior art, and to enable an automatic assembling machine to handle coil springs in assembling ballpoint tips by using a coil spring capable of serving as both a spring for indirectly pressing the ball and a ball pressing member in contact with the ball, forming the coil spring so that gaps between the coils of the coil spring in an unloaded state is smaller than the diameter of a spring wire forming the coil spring to prevent entangling coil springs with each other, and coiling the spring wire in end coils to form an end part of the coil spring to be held in a caulked back end part of the body member of a ballpoint tip in an outside diameter greater than that of effective coils of the coil spring so that coil springs can be suspended in the same position.
Another object of the present invention is to provide a push-button type or a cap type ballpoint liquid container containing an ink having a viscosity in the range of a low viscosity of 3.5 cps to a high viscosity of 5,000 cps at 20° C., including a ballpoint tip having a body member, a ball held in a tip part of the body member, and a spring disposed behind the ball and having a large base end held in a back end part of the body member by caulking the back end part of the body member. The ball is pressed against the inner surface of the tip part of the body member by the spring so as to close the open tip of the body member to prevent the leakage of the ink from the tip of the ballpoint tip while the ballpoint liquid container is not in use or being carried and to prevent the ink around the ball from drying up.
With the foregoing objects in view, the present invention provides a ball point tip for a ballpoint liquid container including a tubular body member, a ball rotatably held in a tip part of the tubular body member, and a coil spring formed by coiling a spring wire, inserted in the tubular body member and capable of being strained by a pressure applied to the ball; in which the coil spring has a straight forward end part formed by linearly extending the spring wire and a base end formed by coiling the spring wire in end coils of an outside diameter greater than that of effective coils of the coil spring, the coil spring is extended in the tubular body member with the straight forward end part thereof extended through a liquid passage and pressed against the ball and with the base end thereof held by a back end part of the body member by caulking the back end part.
REFERENCES:
patent: 5655847 (1997-08-01), Kobayashi et al.
patent: 5688061 (1997-11-01), Aoki
patent: 5711626 (1998-01-01), Kobayashi et al.
patent: 5871296 (1999-02-01), Furukawa et al.
patent: 5876142 (1999-03-01), Furukawa
patent: 5984559 (1999-11-01), Shiobara et al.
Huson Gregory L.
Kotobuki & Co. Ltd.
Le Huyen
McGinn & Gibb PLLC
LandOfFree
Ballpoint tip for ballpoint liquid container does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ballpoint tip for ballpoint liquid container, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ballpoint tip for ballpoint liquid container will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2544952