Applicator that allows easy mounting and removal of cartridge

Patent metadata

Field	Value
Publication number	US-9975140-B2
Application number	US-201615206458-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 14, 2015
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A cartridge fitting portion of a cylindrical syringe made of a resin includes an end surface opening portion, a continuous opening portion continuous with the end surface opening portion, opened in a radial direction, and extending in an extending direction, and a recess portion configured to communicate with the end surface opening portion, the continuous opening portion, and an internal passage in a cylindrical body. The recess portion includes a flange fitting recess to be fitted with a flange portion of a cartridge, and a cylindrical portion fitting recess that communicates with the flange fitting recess and is fitted with a part of the cylindrical portion. A wall portion surrounding the cylindrical portion fitting recess of the cartridge fitting portion is configured to warp into snap engagement with the part of the cylindrical portion when the part of the cylindrical portion is inserted from the continuous opening portion.

First claim

What is claimed is:

1. An applicator comprising:
a cylindrical syringe made of a resin and including a cylindrical body having two ends, the cylindrical body including a cartridge fitting portion at one of the two ends of the cylindrical body, the cartridge fitting portion being configured to be fitted with a cartridge which includes a cylindrical portion having two ends, having an opening portion and a flange portion at one of the two ends of the cylindrical portion, a nozzle portion provided at the other of the two ends of the cylindrical portion, and a piston disposed inside the cylindrical portion to push out a content contained in the cylindrical portion from the nozzle portion; and
a plunger made of a resin, having two ends, and including a pressing portion provided at one of the two ends of the plunger and configured to be inserted into the cylindrical syringe from the other of the two ends of the cylindrical body of the cylindrical syringe and to press the piston inside the cartridge fitted with the cartridge fitting portion, and an operated portion provided at the other of the two ends of the plunger, extending through the other end of the cylindrical body of the cylindrical syringe, and configured to be pressed by a finger of an operator, wherein:
the cartridge fitting portion includes an end surface opening portion opened in an extending direction in which the cylindrical body extends, a continuous opening portion continuous with the end surface opening portion, opened in a radial direction, and extending in the extending direction, and a recess portion configured to communicate with the end surface opening portion, the continuous opening portion, and an internal passage in the cylindrical body;
the recess portion includes a flange fitting recess to be fitted with the flange portion of the cartridge, and a cylindrical portion fitting recess configured to communicate with the flange fitting recess and to be fitted with a part of the cylindrical portion;
a wall portion surrounding the cylindrical portion fitting recess of the cartridge fitting portion is configured to warp into snap engagement with the part of the cylindrical portion when the part of the cylindrical portion is inserted from the continuous opening portion;
the flange fitting recess includes a first portion to be fitted with the flange portion, and a second portion located between the flange portion and the cylindrical body when the first portion is fitted with the flange portion;
a sectional shape of an inner wall surface of the wall portion surrounding the cylindrical portion fitting recess has an arcuate profile that is continuous with the continuous opening portion, as the wall portion is cut in a direction orthogonal to a longitudinal direction of the cylindrical syringe;
the arcuate profile has an arcuate angle larger than 180 degrees; and,
an inner wall surface of a wall portion surrounding the second portion of the flange fitting recess is shaped to become gradually smaller in radial dimension as the second portion extends toward the cylindrical body such that the flange portion is tilted to slide on the inner wall surface when extracting the cylindrical portion from the cylindrical portion fitting recess by causing the distal end side of the cylindrical portion to get out from the continuous opening portion while lifting the cylindrical portion using the flange portion as the fulcrum.

2. The applicator according to claim 1 , wherein:
a stepped portion to be engaged with the flange portion is formed between the flange fitting recess and the cylindrical portion fitting recess; and
the stepped portion is configured to entirely contact the end surface of the flange portion located on the side of the cylindrical portion.

Assignees

• Shofu Inc

Inventors

• Takei Ryouji
• Yoneda Akira
• Sakamoto Shuji
• Kadobayashi Yusei

Classifications

• A61C5/62

  Applicators, e.g. syringes or guns · CPC title

• A61C1/08

  Machine parts specially adapted for dentistry · CPC title

• B05C17/00576

  characterised by the construction of a piston as pressure exerting means, or of the co-operating container · CPC title

• B05C17/00593 Primary

  Hand tools of the syringe type · CPC title

• A61C5/00 Primary

  Filling or capping teeth · CPC title