Door opening/closing system and catch therefor

• US 8,584,402 B2
• Filed: 08/18/2010
• Issued: 11/19/2013
• Est. Priority Date: 08/20/2009
• Status: Expired due to Fees

• Current Assignee: Sugatsune Kogyo Co., Ltd.
• Original Assignee: Sugatsune Kogyo Co., Ltd.
• Inventors: Yamaguchi, Koushi
• Primary Examiner(s): REDMAN, JERRY E
• Application Number:
  US13/391,533
• Publication Number:
  US 20120180395A1
• Time in Patent Office: 1,189 Days
• Field of Search: 492/75, 492/76, 493/79, 493/64, 312/319.2 X, 312/333, 312/405
• US Class Current: 49/379
• CPC Class Codes: E05F 1/14 with double-acting springs, e.g. for closing and opening or checking and closing no material
• CPC Class Codes: E05F 5/027 with closing action
• CPC Class Codes: E05Y 2201/412 for the final closing movement
• CPC Class Codes: E05Y 2800/24 of springs and brakes
• CPC Class Codes: E05Y 2900/132 Doors
• CPC Class Codes: Y10T 292/096 Sliding

Abstract

Provided is a door opening and closing system capable of returning to a return state where a catch and a retractable arm are engaged with each other even if the retractable arm is closed completely as a result of incorrect usage such as a prank. A catch has a catch base which is mounted on either one of the door and a frame and a catch shaft which is installed in the catch base slidable in an axial direction and engaged with a retractable arm. At a tip end of the catch shaft, a small-diameter part is provided as a step part. The step part of the catch shaft and the retractable arm are engaged with each other in a state where the retractable arm is further rotated in the closing direction after a main body part of the catch shaft and the retractable arm are engaged with each other.

Claims

1. A door opening and closing system comprising:

a catch which is mounted at either one of a door and a frame; and

a door opening and closing device which is mounted on an opposite one of the door and the frame and has a retractable arm that is engaged with the catch, in which, when the door gets closed, the retractable arm of the door opening and closing device is engaged with the catch and the retractable arm rotates about an arm axis to give the door a force in a closing direction, wherein

the catch has a catch base which is mounted on the one of the door and the frame and a catch shaft which is installed in the catch base slidable in an axial direction and engaged with the retractable arm,

the catch shaft has a main body part which is engageable with the retractable arm and a step part which is provided at a tip end of the main body part by hollowing at least a part of the main body part in a circumferential direction and engageable with the retractable arm, and

the step part of the catch shaft and the retractable arm are engaged with each other in a state where the retractable arm is rotated more in the closing direction than in a state where the main body part of the catch shaft and the retractable arm are engaged with each other.

2. The door opening and closing system of claim 1, wherein the step part is provided on an entire circumference of the catch shaft.

3. The door opening and closing system of claim 2, wherein the catch base has a slot formed therein for adjusting a mounting position of the catch base relative to the door or the frame.

4. The door opening and closing system of claim 1, wherein the catch base has a slot formed therein for adjusting a mounting position of the catch base relative to the door or the frame.

5. The door opening and closing system according to claim 1, wherein the step part has a smaller diameter than the main body part, and the step part is concentric with the main body part.

6. The door opening and closing system according to claim 1, wherein a catch spring is inserted between the main body part and a back cover so as to make the catch shaft jut from a catch outer shaft.

7. The door opening and closing system according to claim 6, wherein the catch shaft is adapted to jut from the catch outer shaft until a flange of the catch shaft abuts to a step difference in an inner peripheral surface of the catch outer shaft.

8. A door opening and closing system comprising:

a catch which is mounted at either one of a door and a frame; and

a door opening and closing device which is mounted on an opposite one of the door and the frame and has a retractable arm that is engaged with the catch, in which, when the door gets closed, the retractable arm of the door opening and closing device is engaged with the catch and the retractable arm rotates about an arm axis to give the door a force in a closing direction, wherein

the catch has a catch base which is mounted on the one of the door and the frame and a catch shaft which is installed in the catch base slidable in an axial direction and engaged with the retractable arm,

the catch shaft has a main body part which is engageable with the retractable arm and a step part which is provided at a tip end of the main body part and smaller in diameter than the main body part, and

the step part of the catch shaft and the retractable arm are engaged with each other in a state where the retractable arm is more rotated in the closing direction than in a state where the main body part of the catch shaft and the retractable arm are engaged with each other.

9. The door opening and closing system according to claim 8, wherein the step part has a smaller diameter than the main body part, and the step part is concentric with the main body part.

10. The door opening and closing system according to claim 8, wherein a catch spring is inserted between the main body part and a back cover so as to make the catch shaft jut from a catch outer shaft.

11. The door opening and closing system according to claim 10, wherein the catch shaft is adapted to jut from the catch outer shaft until a flange of the catch shaft abuts to a step difference in an inner peripheral surface of the catch outer shaft.

12. A catch for a door opening and closing system which gives a door a force in a closing direction when the door gets closed, wherein

the catch has a catch base which is mounted on either one of the door and a frame and a catch shaft which is installed in the catch base slidable in an axial direction and engaged with a retractable arm,

the catch shaft has a main body part which is engageable with the retractable arm and a step part which is provided at a tip end of the main body part and smaller in diameter than the main body part, and

the step part of the catch shaft and the retractable arm are engaged with each other in a state where the retractable arm is more rotated in the closing direction than in a state where the main body part of the catch shaft and the retractable arm are engaged with each other.

13. The door opening and closing system according to claim 12, wherein the step part has a smaller diameter than the main body part, and the step part is concentric with the main body part.

14. The door opening and closing system according to claim 12, wherein a catch spring is inserted between the main body part and a back cover so as to make the catch shaft jut from a catch outer shaft.

15. The door opening and closing system according to claim 14, wherein the catch shaft is adapted to jut from the catch outer shaft until a flange of the catch shaft abuts to a step difference in an inner peripheral surface of the catch outer shaft.