| 摘要 |
A casement latch with fix position device includes a base including a shaft hole, first and second sets of two raise plates, and a slide accepter; two opposite blade springs each fastened between the raise plates of the first set of raise plates or the second set of raise plates; a rotary bolt including a shaft short side on a first surface, a shaft long side on an opposite second surface, a square through hole the first and shaft long sides, an engagement member, and a rotary bolt interface wherein the shaft long side is between the blade springs and into the shaft hole; a cover plate releasably secured to the base and including a shaft hole with the shaft short side rotatably disposed therein; and a lever assembly co-rotated with the rotary bolt and releasably secured to a casement, the cover plate, and the base. |
| 主权项 |
1. A casement latch comprising:
a base including a recess, a shaft hole, first and second sets of two raise plates, a first stop surface on a wall of the recess, and a second stop surface on the wall of the recess, and a slide accepter between the first stop surface and the second stop surface; a surface plate releasably secured to the base and including an intermediate rectangular cut; a strike configured to releasably secure to a casement frame and including an intermediate rectangular cut member; two opposite blade springs each fastened between the raise plates of the first set of raise plates or the second set of raise plates; a rotary bolt including a bolt hook, a shaft short side on a first surface, a shaft long side on a second surface opposing the shaft short side, a square hole through the shaft short side and the shaft long side, four spaced square cut surfaces formed on four edges of the shaft long side, four spaced curve positions each formed between two adjacent ones of the square cut surfaces, a lower interface formed on the bolt hook, and an upper interface formed on the bolt hook wherein the shaft long side is disposed between the blade springs and into the shaft hole; a cover plate releasably secured to the base and including a shaft hole member with the shaft short side rotatably disposed therein wherein the assembled base, the cover plate, and the rotary bolt are configured to dispose in a casement; and a lever assembly releasably secured to the casement, the cover plate, and the base and including a square spindle inserted through the casement and the shaft hole member into the square hole, and a lever configured to co-rotate with the square spindle; wherein in response to a 90-degree clockwise turning the lever, the rotary bolt clockwise turns to cause the curve positions of the shaft long side to further bend the blade springs, cause the square cut surfaces of the shaft long side are clamped the blade springs and cause the first stop surface to stop at the upper interface, thereby fixed the position of the rotary bolt at locking position; and wherein in response to a 90-degree counterclockwise turning the lever, the rotary bolt counterclockwise turns to cause the curve positions of the shaft long side to bend the blade springs, cause the square cut surfaces of the shaft long side are clamped by the blade springs, and cause the second stop surface to stop at the lower interface, thereby fixed the position of the rotary bolt at unlocking position. |
