| 摘要 |
An armless door closer includes a housing, a pivot shaft installed in the housing, a piston engaged with a lower portion of the pivot shaft, a spring providing a resilient force to the piston, fluid filled in an upper and a lower cylinder chamber of the housing, a lower cap closing the housing, a door plate and a frame plate engaged with the pivot shaft in that order. The armless door closer further includes a piston connecting member installed at a lower portion of the piston, the piston connecting member selectively closing a throttle orifice through which the fluid flows, the fluid flow being generated by the reciprocating movement of the piston; a flow control member installed at a lower portion of the piston connecting member, the flow control member having a flow passage formed in a length wise direction of the flow control member through which an adjustable amount of the flow passes from the upper cylinder chamber to the lower cylinder chamber; and a flow control bolt installed in the flow passage, the flow control bolt adjusting the amount of the flow by minute movement thereof. The armless door closer provides a simple configuration and facilitates manufacturing process since the flow control member and the flow control bolt are installed in the housing. Further, since the passage of the fluid is shorter than that of the conventional closers, the armless door closer provides more precise flow control, thereby facilitating the control of the door closing velocity. |
