US 7,861,461 B2 · Method for automatically opening door and device for automatically opening and closing door

Abstract

A door opening and closing device for a slide door, which can be horizontally open and close the slide door by application of a light load and which can be constructed and maintained at low costs. The door opening and closing device has a transmission mechanism for converting through a lever (31) the amount of settlement of a tread plate (21) placed on floor surfaces at positions in front and back of the slide door (12), into a predetermined displacement amount. The tread plate (21) is weight-wise balanced such that the transmission mechanism and settlement of the tread plate due to the weight of an adjustment weight (W) causes the tread plate (21) to float through the lever (31). Up-down movement of the long transmission member (32) presses a drive rotation body (42) to an open door rail (41), and a component force of the pressing force allows the slide door (12) to be opened by application of a light load.

Claims7

Dependent claims

A device for automatically opening and closing a door comprising:

a tread plate that is arranged to be freely moveable up and down;
a suspend door rail that is inclined downwardly toward a closing direction of the door;
a door support body that connects the door to the suspend door rail in a freely moveable manner;
an open door rail fixed to the door that is inclined downwardy toward an opening direction of the door;
and
an open door mechanism with a pressing body that applies a pressing force to the open door rail from below the open door rail wherein the pressing body moveably contacts the open door rail when the tread plate is depressed.

3 more elements

A device for automatically opening and closing a door comprising:

a tread plate that is arranged to be freely moveable up and down;
a door supported to be moveable toward opening and closing directions;
an open door rail fixed to the door that is inclined downwardly toward the opening direction of the door;
an open door mechanism with a pressing body that applies a pressing force to the open door rail from below the open door rail wherein the pressing body moveably contacted to the open door rail when the tread plate is depressed;
and
a close door biasing mechanism that applies a biasing force to the door toward the closing direction.

3 more elements

Dependencies are inferred from the claim text.

Method for automatically opening door and device for automatically opening and closing door

Life of this patent

Method for automatically opening door and device for automatically opening and closing door

Life of this patent

Abstract

Claims7