Patent ID: 8533909
Filing Date: 2013-09-17
Classification: E05D,E05F,E05Y,Y10T

Abstract:
1. A door opening and closing device, comprising: a first closer mechanism and a second closer mechanism incorporated with a longitudinal direction oriented in a vertical direction into each of a first end part and a second end part, respectively, of a pair of hinge pieces that rotatably connect a pair of door panels of a folding door together each closer mechanism comprising: a coil spring with a longitudinal direction oriented in the vertical direction; a first pin plate and a second pin plate attached to the coil spring, the first pin plate partially inserted into a first end part of the coil spring, the second pin plate partially inserted into a second end part of the coil spring; wherein the first and second pin plates each comprise a plurality of engagement grooves configured to engage with an inner circumferential surface of the coil spring; and a bracket that fixedly connects one of the hinge pieces to the first pin plate; wherein the folding door is closed by a restoring force generated by a twisting of the coil springs.