US 12,460,471 B2
Mass spectrometer
Tetsuya Hemmi, Kyoto (JP)
Assigned to SHIMADZU CORPORATION, Kyoto (JP)
Appl. No. 17/918,655
Filed by SHIMADZU CORPORATION, Kyoto (JP)
PCT Filed Feb. 4, 2021, PCT No. PCT/JP2021/004092
§ 371(c)(1), (2) Date Oct. 13, 2022,
PCT Pub. No. WO2021/229870, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 2020-085214 (JP), filed on May 14, 2020.
Prior Publication US 2023/0147319 A1, May 11, 2023
Int. Cl. E06B 5/00 (2006.01); E06B 7/16 (2006.01); G01N 30/72 (2006.01); H01J 49/04 (2006.01)
CPC E06B 5/00 (2013.01) [E06B 7/16 (2013.01); G01N 30/7206 (2013.01); H01J 49/0422 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A mass spectrometer, comprising:
a housing in which a vacuum chamber brought into a vacuum state at a time of analysis is formed, the housing having an opening communicating with the vacuum chamber;
a door for opening and closing the opening, the door being rotatably attached to a part of a wall surface that partitions the vacuum chamber in the housing; and
a hinge portion configured to rotatably support the door between an open state and a closed state, wherein
the door includes a closing portion that closes the opening in a closed state, and a holding portion that holds the closing portion and is connected to the hinge portion,
the closing portion is connected to the holding portion on a side opposite to the hinge portion side, and is configured to be separable from the holding portion on the hinge portion side, and
in a case where the door is rotated from an open state to a closed state, the closing portion is configured to come into contact with a peripheral edge portion of the opening on a side opposite to the hinge portion side before the closing portion comes into contact with a peripheral edge portion of the opening on the hinge portion side, and
in a case where the door is rotated from an open state to a closed state, the closing portion is configured to come into close contact with the peripheral edge portion of the opening on the hinge portion side by own weight of the closing portion after the closing portion comes into contact with the peripheral edge portion of the opening on the side opposite to the hinge portion side.