Invention Grant
- Patent Title: Door latch device
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Application No.: US17416789Application Date: 2019-11-25
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Publication No.: US11767688B2Publication Date: 2023-09-26
- Inventor: Nobuya Akagi , Yuki Tanaka
- Applicant: U-Shin Ltd.
- Applicant Address: JP Nagano
- Assignee: U-SHIN LTD.
- Current Assignee: U-SHIN LTD.
- Current Assignee Address: JP Nagano
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- Priority: JP 18238708 2018.12.20
- International Application: PCT/JP2019/045974 2019.11.25
- International Announcement: WO2020/129542A 2020.06.25
- Date entered country: 2021-06-21
- Main IPC: E05B81/16
- IPC: E05B81/16 ; E05B81/06 ; E05B81/34

Abstract:
A door latch device includes a latch mechanism, an inner lever having a connection lever and an actuation lever, and a lock mechanism switching between unlocked and locked state. The lock mechanism includes a connection member capable of transmitting operation of the connection lever to the actuation lever, a first rotating lever rotated by a motor to first and second working positions, a second rotating lever rotatable to a first rotation position where the connection member is moved to an unlock position and a second rotation position where the connection member is moved to a lock position, a connection spring connecting the first rotating lever and the second rotating lever while allowing relative rotation of them, and a holding spring having a biasing force stronger than a biasing force of the connection spring and holds the first rotating lever at the first and second working positions.
Public/Granted literature
- US20220065005A1 DOOR LATCH DEVICE Public/Granted day:2022-03-03
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