Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to advance material
Patent
1998-09-28
2000-07-18
Walczak, David J.
Coating implements with material supply
Solid material for rubbing contact or support therefor
Including means to advance material
401 99, 401 67, B43K 2116
Patent
active
060897759
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a slider type writing implement having a plurality of cam grooves formed in a rear inner surface of an outer tubular shell, a rotor slidably/rotatably disposed within the cam grooves, and a slider for pushing and rotating the rotor.
BACKGROUND OF THE INVENTION
One example of a known writing implement of the above type is disclosed in Japanese Patent Examined Publication No. 54-14524/1979. According to the teaching of this publication, the device has a tip pipe whose tip portion projects from a forward end of a body to protect a writing lead and a content including an inside ferrule containing therein a lead retainer, a chuck and a fastening device, a fastening device retainer disposed on the inside ferrule, a lead case connected to the chuck, etc. The tip pipe and the content are capable of back and forth movements within the body. A rear end of the fastening device retainer is retained by a mechanism such that the retainer is locked in an advanced position by a first knocking operation and in a retracted position by a second knocking operation. A first spring is interposed between the body and the lead case, and a second spring is interposed between the body and the fastening device retainer. With this construction, a mechanical pencil having a content advancement/retraction mechanism is characterized in that the content is locked in the advanced position by a first large knocking operation, then the writing lead is advanced by a small knocking operation, and the content is locked in the retracted position (or received in place) by a second large knocking operation. In other words, according to the conventional construction mentioned above, the content can be exposed or withdrawn (by a large knocking operation) and the writing lead can be advanced (by a small knocking operation) by properly selecting the modes of the knocking operations.
However, in the above conventional technique, it is required for the user to determine a pressing amount of a knock cap either by guessing or by watching a stepped portion of the knock cap when one of the knocking modes (i.e., a large knocking operation and a small knocking operation) is to be selected.
Obviously, it is difficult for the user to determine the pressing amount of the knock cap by guessing. It sometimes happens that a large knocking operation is made by mistake while a small knocking operation (writing lead advancement operation) is intended. The result is that the content is withdrawn, thus giving an unpleasant feel to the user unable to write. Furthermore, a pressing amount determination operation by watching the stepped portion is convenient because it requires causes the user to watch the knock cap sideways each time the knocking operation is required.
SUMMARY OF THE INVENTION
The present invention has been accomplished in view of the abovementioned problems. It is, therefore, an object of the present invention to provide an improved slider type mechanical pencil, in which the abovementioned shortcomings inherent in the conventional construction are obviated.
It is another object of the invention to provide an improved mechanical pencil, in which a large knocking operation and a small knocking operation can be selectively made with the feel of a finger in a reliable manner and therefore, a favorable sliding operation and a favorable writing operation can be obtained.
The first feature of the present invention resides in a slider type mechanical pencil having a plurality of cam grooves formed in a rear inner surface of an outer tubular shell, a rotor slidably/rotatably disposed within the cam grooves, and a slider for pushing and rotating the rotor, wherein an inner tubular shell having a lead advancement mechanism is disposed ahead of the rotor in abutment relation with the rotor, and a pusher member for sliding on an inner surface of the slider in order to push and rotate the rotor and actuating the lead advancement mechanism is disposed within the slider such that the pusher member can b
REFERENCES:
patent: 3001510 (1961-09-01), Chelazzi
patent: 3450482 (1969-06-01), Dorstewitz
patent: 3724960 (1973-04-01), Hashimoto et al.
patent: 4106874 (1978-08-01), Torii
Pentel Kabushiki Kaisha
Walczak David J.
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