Hidden door closer

Abstract

A hidden door closer comprises a bottom plate. An assembly hole is formed in the middle of the bottom plate. A center shaft is mounted in the assembly hole. The part, on the upper portion of a base plate, of a shaft body is sleeved with a casing pipe. The outer surface of the casing pipe is sequentially sleeved with a locking plate and an adjusting plate. The locking plate and the adjusting plate are fixedly connected. A casing pipe is fixed to the upper surface of the adjusting plate. The part, located in the casing pipe, of the center shaft body is sequentially sleeved with lower springs upwards. The part, at the upper end of one lower spring, of the center shaft body is sleeved with a lower one-way ratchet wheel. A two-way ratchet wheel engaged with the lower one-way ratchet wheel is fixed to the top of the center shaft. An upper one-way ratchet wheel engaged with the ratchet wheel is arranged at the upper end of the ratchet wheel. An upper spring is arranged at the upper end of the upper one-way ratchet wheel. A pressing plate for pressing the upper spring to the upper end of the upper one-way ratchet wheel is arranged at an upper opening of the corresponding casing pipe. 90-degree ratchet wheel cooperation is adopted, a door body is located when rotating to the position of 90 degrees, and automatic door closing can be achieved when the door body rotates to the position smaller than 90 degrees.

Description

technical field [0001] The invention relates to a door opening accessory, in particular to a concealed door closer. Background technique [0002] In the prior art, there is a door closer installed on a door in a public place. When the door is pushed or pulled open, the door can be automatically closed under the action of the door closer; The door closers are generally hung on the outside and are made of connecting rods; they are not beautiful and the hinges must cooperate when the function of the door closer is turned. Invisible door closers also need to work together with the connecting rod slide rails to solve the problem of automatic closing of the door closer. Contents of the invention [0003] The purpose of the present invention is to provide a concealed door closer, which is not exposed when installed, and has the function of a hinge. [0004] A concealed door closer is provided, which includes a bottom plate; an assembly hole is provided in the middle of the base;...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, there is a door closer installed on a door in a public place. When the door is pushed or pulled open, the door can be automatically closed under the action of the door closer; The door closers are generally hung on the outside and are made of connecting rods; they are unsightly and the hinges must cooperate when the function of the door closer is rotated.

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