Multiplex writing implement
First Claim
1. A multiplex writing implement comprising:
- a barrel cylinder;
a mouthpiece extending from a front of the barrel cylinder, the mouthpiece being tapered toward a front end opening thereof;
a plurality of ball-point pen elements disposed within the barrel cylinder, each ball-point pen element having an ink reservoir which is filled with one of a water based ink having thixotropy or a low-viscosity oil based ink, each ball-point pen element being configured so that a writing tip thereof can selectively move in and out through the front end opening of the mouthpiece, each ball-point pen element having a point assembly at one end thereof, at least a front part of the barrel cylinder being formed of a transparent resin molding and the mouthpiece being formed of an opaque material, wherein longitudinal grooves are formed at predetermined positions on the tapering inner surface of the mouthpiece and a ball holder of the point assembly is loosely inserted in the longitudinal groove when the writing tip moves in and out through the front end opening so that at least the ball holder is kept out of contact with the tapering inner surface of the mouthpiece.
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Accused Products
Abstract
A multiplex writing implement has a multiple number of ball-point pen elements in the barrel cylinder thereof, in which an ink reservoir thereof is filled with a water based ink having so-called thixotropy, which is a characteristic which lowers the viscosity of ink as the tip ball rolls, allowing outflow of ink, or a low-viscosity oil based ink and which are configured so that their writing tips can selectively move in and out through the front end opening of a mouthpiece of the barrel cylinder, and is constructed such that at least the front part of the barrel cylinder is formed of a transparent resin molding and the mouthpiece which is opaque and tapered toward the front end is attached to the front of the barrel cylinder.
22 Citations
13 Claims
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1. A multiplex writing implement comprising:
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a barrel cylinder;
a mouthpiece extending from a front of the barrel cylinder, the mouthpiece being tapered toward a front end opening thereof;
a plurality of ball-point pen elements disposed within the barrel cylinder, each ball-point pen element having an ink reservoir which is filled with one of a water based ink having thixotropy or a low-viscosity oil based ink, each ball-point pen element being configured so that a writing tip thereof can selectively move in and out through the front end opening of the mouthpiece, each ball-point pen element having a point assembly at one end thereof, at least a front part of the barrel cylinder being formed of a transparent resin molding and the mouthpiece being formed of an opaque material, wherein longitudinal grooves are formed at predetermined positions on the tapering inner surface of the mouthpiece and a ball holder of the point assembly is loosely inserted in the longitudinal groove when the writing tip moves in and out through the front end opening so that at least the ball holder is kept out of contact with the tapering inner surface of the mouthpiece. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A multiplex writing implement comprising:
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a barrel cylinder;
a mouthpiece extending from a front of the barrel cylinder, the mouthpiece being tapered toward a front end opening thereof;
a plurality of ball-point pen elements disposed within the barrel cylinder, each ball-point pen element having an ink reservoir which is filled with one of a water based ink having thixotropy or a low-viscosity oil based ink, each ball-point pen element being configured so that a writing tip thereof can selectively move in and out through the front end opening of the mouthpiece, each ball-point pen element having a point assembly at one end thereof, at least a front part of the barrel cylinder being formed of a transparent resin molding and the mouthpiece being formed of an opaque material, wherein a joint for joining the ink reservoir and the point assembly has a projection on a peripheral surface thereof which comes in contact with the tapering inner surface of the mouthpiece in such a manner that a ball holder of the point assembly is kept out of contact with the tapering inner surface of the mouthpiece when the writing tip moves in and out through the front end opening of the mouthpiece. - View Dependent Claims (8, 9, 10, 11, 12)
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13. The multiplex writing implement according to claimed 7, wherein the joint has a flexible portion, and the projection is provided to the point assembly side with respect to the flexible portion.
Specification