Door closer

Abstract

The present invention relates to an apparatus for closing the door slowly and automatically. The conventional door closer has a complicated structure and causes much energy loss because the compressing force of the compression spring in the body is transferred through a gear. However, the present invention 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. The installed conventional door closet must be disassembled and reassembled for a force adjustment to adjust the opening and closing force of the door, and it was very difficult to install the conventional door closer due to the adjustment of mounting position to the door and the doorframe and the length of the link. However, the present invention can be simply adjusted for the force adjustment by turning the force adjustment nut when it is installed, 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. The invention can be applied to all kinds of small- or big-sized opening and closing doors including a plastic door, an aluminum door, a wood door, and a steel door to close slowly and automatically.

Description

technical field [0001] The invention relates to a door closer which slowly and automatically closes various open and close doors. Background technique [0002] In order to automatically close the door, as shown in Figure 2, the cylindrical body filled with hydraulic oil is provided with a spring and a gear, and the restoring force of the spring (71) passes through the gear a (72), the gear b (73) and the connecting rod (74) Slowly and automatically close the door. In the existing product, the force loss is large because the restoring force of the spring closes the door through the gear and the connecting rod. It needs a strong compression spring and has gears inside, so its structure is complicated and heavy. The appearance is affected by the external attachment of the connecting rod. And, after installation, in order to adjust the strength of opening and closing the door, after disassembling the connecting rod (74) from the protruding rod (73a) formed on the gear b (73) ...

AI Technical Summary

Problems solved by technology

In existing products, because the restoring force of the spring closes the door through the gear and the connecting rod, the force loss is large

Requires a strong compression spring and internal gears, so its structure is complex and heavy

Aesthetics are affected by externally attached connecting rods

And, after installation, in order to adjust the strength of opening and closing the door, after disassembling the connecting rod (74) from the protruding rod (73a) formed on the gear b (73) in Fig. 2 and Fig. The angle of the connecting rod (74) on the rod (73a) is adjusted to adjust the strength, so the strength adjustment is very inconvenient, and a lot of force is consumed in order to adjust the strength

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