Door closer
OwnerJang-Woo Songinventor
Life of this patent
Estimating the term…
Abstract
The apparatus for closing the door slowly and automatically can directly get the door closed by the piston rod without passing through a gear, so that the energy loss is little, and a small amount of air is contained in the hydraulic oil in order for the piston and the piston rod to be moved to the left and right hand side. The closing speed of the door can be adjustable by turning a speed adjustment bolt and for the installation, it is very easy to install the present invention since the function of the invention works with a force adjustment by turning the force adjustment nut when the invention is fixed to the door and doorframe.
Claims5
A door closer which is fabricated in a hydraulic or air cylinder shape in its body and being installed to a door (10) or a doorframe (11),
- wherein a subsidiary plate (9a) with a subsidiary pin (9b) is assembled to a door mounting device (9) installed at the door (10), and a rotatable force adjustment nut (7) is assembled to the subsidiary plate (9a) so that it can change the position of a piston rod (3) to the door (10) or to the doorframe (11);
- wherein a cylinder (1) is assembled to a doorframe mounting device (8) installed at the doorframe (11), a surface of the cylinder (1) being hemi-cylindrical, in which an oil-hole is formed and a speed adjustment bolt is assembled at end thereof, extending linearly in the longitudinal direction along a piston (2), and a spring (5) is mounted in the cylinder (1) and hydraulic oil containing a little amounts of air is filled in the cylinder (1), the piston rod (3) is extending from an inner side to an outer side of the cylinder (1), one end of the piston rod (3) being provided with the piston (2) and the other end thereof being provided with male screw (3a) in which minor diameter of an external thread is greater than a diameter of the piston rod (3);
- and
- wherein the door mounting device (9) including the force adjustment nut (7), subsidiary plate (9a) and subsidiary pin (9b), and the doorframe mounting device (8) including the cylinder (1), the piston rod (3) and the male screw (3a), can be assembled and separated from each other by the force adjustment nut (7) provided at the door mounting device (9), and the male screw (3a) provided at the one end of the piston rod (3).
Dependencies are inferred from the claim text.