Door apparatus

• US 4,829,712 A
• Filed: 06/23/1988
• Issued: 05/16/1989
• Est. Priority Date: 12/18/1987
• Status: Expired due to Fees

• Current Assignee: Mituru Itoh
• Original Assignee: Mituru Itoh
• Inventors: Itoh, Mituru
• Primary Examiner(s): Dorner, Kenneth J.
• Assistant Examiner(s): Anderson, Gerald A.
• Application Number:
  US07/210,276
• Time in Patent Office: 327 Days
• Field of Search: 49/386, 49/246, 49/253, 49/153, 49/345, 49/344, 49/339
• US Class Current: 49/246
• CPC Class Codes: E05D 15/28 supported on arms movable in horizontal plane
• CPC Class Codes: E05F 11/12 Mechanisms by which the bar shifts the wing
• CPC Class Codes: E05Y 2900/132 Doors

Abstract

This invention relates to a novel door apparatus of the type wherein one door rotates while moving horizontally to the righ or left when opened, and finally approaches to the sidewall of an entrance and becomes in parallel therewith. The door apparatus of the invention is particularly suitable for the handicapped or those who use a wheelchair and who have difficulty in passing smoothly through doors in general.

Claims

1. A door apparatus comprising:

an upper stay consisting of;

an upper support bed fixed to a sidewall of an entrance in such a manner as to extend horizontally therefrom, and equipped with a round pillar projecting from a flat upper surface of said upper supported bed, with a through-hole at the center of said round pillar and with a pin implanted at a diagonal position of 45°

to a line at right angles to the sidewall of the entrance;

an upper support frame having a thinly elongated box shape whose both end portions are rounded, having a fitting hole for said round pillar formed in a box bottom at one of the end portions thereof, supported rotatably in the horizontal direction when said round pillar is fitted into said fitting hole, and said upper support frame having an elongated hole in the circumferential direction at an arc-shaped sidewall portion at the other end portion thereof;

a support shaft implanted in the box bottom of the end portion opposite to said round pillar and inside said upper support frame;

an arm rod rotating horizontally and supported by said support shaft at one end and at the other end connected to the center of said door in the transverse direction;

two pins implanted, with a predetermined spacing between then and on a line connecting the center of said round pillar to the center of said support shaft,

in the box bottom and inside said upper support frame; and

two lever arms linked together at one end (links as a pair), each lever arm equipped with a centrally located axially elongated hole into which one of said upper support frame pins are fitted slidably, and having the second end of one lever am rotatably connected to said support bed pin and the second end of the other lever arm connected to a second pin implanted at substantially the center of said arm rod and parallel to the support shaft and, said linked lever arms having a full length equal to the distance between the center of said round pillar and the center of said support shaft;

a lower stay having the same construction as that of said upper stay;

a door supported by said arm rods of said upper and lower stays;

an interlocking shaft fitted to said through hole of said upper support bed in said upper stay, and having the upper end thereof connected to a ceiling part of said upper support frame and the lower end of said interlocking shaft connected to said lower support frame in said lower stay; and

a rotation means for horizontally rotating said upper support frame in said upper stay with said round pillar of said upper support bed being the support point of rotation.