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US 11,090,969 B2Granted
Mechanical pencil
AssigneesKotobuki & Co., Ltd., Pica-Marker VermöGens GmbH & Co. KG
InventorsHidehei Kageyama, Tadao Odaka, Toshikazu Sasaki
Life of this patent
Estimating the term…
Abstract
A mechanical pencil includes a writing lead, a chuck that chucks the writing lead and feeds the writing lead forward, and a shaft tube for housing the writing lead and the chuck. When a click operation for feeding the chuck forward is performed, a jet stream flowing forward is generated inside the shaft tube.
Claims17
A mechanical pencil, including:
- a writing lead;
- a chuck that chucks the writing lead and feeds the writing lead forward;
- a click button for feeding the chuck forward;
- a chuck spring that urges the chuck rearward, and a metal stopper that comes into abutment with the chuck spring;
- a shaft tube for housing the writing lead and the chuck,
- wherein, when a click operation for feeding the chuck forward is performed, a jet stream flowing forward is generated inside the shaft tube,
- wherein at least apart of the shaft tube includes a metal material, and the metal stopper is integrally fixed to the part of the shaft tube that includes the metal material, by a swaging processing in which the part of the shaft tube and the metal stopper are pressed together radially inward from an outer peripheral surface of the part of the shaft tube;
- and
- in a vicinity of the chuck, an acceleration flow path in which a flow path of the jet stream is narrowed,
- wherein the acceleration flow path is formed by the swaging processing.
7 more elements
A mechanical pencil, including:
- a writing lead;
- a chuck that chucks the writing lead and feeds the writing lead forward;
- a chuck spring that urges the chuck rearward, and a meal stopper that comes into abutment with the chuck spring;
- a shaft tube for housing the writing lead and the chuck;
- a spacer disposed on a rear end part of the shaft tube,
- wherein the spacer provides a flow path for a jet stream generated inside the shaft tube as the chuck is fed forward,
- wherein at least apart of the shaft tube includes a metal material, and the metal stopper is integrally fixed to the part of the shaft tube that includes the metal material, by a swaging processing in which the part of the shaft tube and the metal stopper are pressed together radially inward from an outer peripheral surface of the part of the shaft tube;
- and
- in a vicinity of the chuck, an acceleration flow path in which the flow path of the jet stream is narrowed,
- wherein the acceleration flow path is formed by the swaging processing.
7 more elements
Dependencies are inferred from the claim text.