Door opening and closing device

• US 8,959,709 B2
• Filed: 02/28/2011
• Issued: 02/24/2015
• Est. Priority Date: 04/16/2010
• Status: Expired due to Fees

• Current Assignee: Sugatsune Kogyo Co., Ltd.
• Original Assignee: Sugatsune Kogyo Co., Ltd.
• Inventors: Hasegawa, Manabu, Suzuki, Masaya
• Primary Examiner(s): O BRIEN, JEFFREY D
• Application Number:
  US13/641,157
• Publication Number:
  US 20130031746A1
• Time in Patent Office: 1,457 Days
• Field of Search: 16/50, 16/49, 16/63, 16/65, 163/66, 163/68, 163/69, 163/70, 163/71, 162/77, 162/78, 162/79, 162/86, 162/87, 162/88, 162/89, 162/91, 162/92, 162/93, 162/94, 162/96, 312/325, 312/327, 312/328, 312/116, 312/139, 312/138.1, 312/319.2, 312/319.3
• US Class Current: 16/65
• CPC Class Codes: E05D 15/46 with two pairs of pivoted arms
• CPC Class Codes: E05D 3/14 with four parallel pins and two arms
• CPC Class Codes: E05F 1/1261 for counterbalancing
• CPC Class Codes: E05F 5/00 Braking devices, e.g. checks; Stops; Buffers construction of pneumatic or liquid braking devices E05F3/00; braking devices, buffers or end stops on drawers for tables, cabinets or like furniture A47B88/473; combined with devices for holding wings open E05C17/00; devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing E05C17/04
• CPC Class Codes: E05F 5/027 with closing action
• CPC Class Codes: E05F 5/10 with piston brakes
• CPC Class Codes: E05Y 2201/26 Mechanical friction
• CPC Class Codes: E05Y 2201/264 linear
• CPC Class Codes: E05Y 2900/20 for furnitures, e.g. cabinets

Abstract

A door opening and closing device can change a damping force of a damper when an arm rotates by opening and closing of a door. On a case 11 of the door opening and closing device 7, the arm 8 is mounted which rotates by opening and closing of the door 2. Inside the case 11, friction generating unit 22 is provided. The friction generating unit 22 has a slider 12d which moves linearly relative to the case 11 by opening and closing of the door 2 and a fixed part 21 which is fixed to the case 11 to slide the slider 12d. The friction generating unit 22 generates friction between the slider 12d and the fixed part 21. In opening and closing of the door 2, a radio of the rotation angle of the arm 8 and the amount of displacement of the slider 12d is varied.

Claims

1. A door opening and closing device, comprising:

a case mounted on a door mounting member;

an arm which is provided rotatable on the case and rotates by opening and closing of a door;

a runner that is linearly movable on the case and is biased by biasing means to apply at least one of a biasing force in an opening direction and a biasing force in a closing direction to the arm;

a link arm which has one end connected rotatable to the runner and an opposite end connected rotatable to the arm around a rotation center of the arm; and

a friction damper having a slider which is fixed to the runner so as to move linearly with the runner relative to the case by opening and closing of the door and a fixed part which is fixed to the case to slide the slider, the friction damper being provided for generating friction between the slider and the fixed part.

2. The door opening and closing device of claim 1, wherein

the slider and the fixed part of the friction damper have respective contact parts where the slider and the fixed part are in contact with each other, and

the friction damper further includes a spring that urges one of the contact parts of the slider and the fixed part toward the other in a direction orthogonal to a direction of linear movement of the slider.

3. The door opening and closing device of claim 1, wherein

either one of the slider and the fixed part of the friction damper has a friction bar which is in parallel with a direction of linear movement of the runner, and

the other of the slider and the fixed part of the friction damper has a hole for insertion of the friction bar.

4. The door opening and closing device of claim 3, wherein

the other of the slider and the fixed part of the friction damper has a slit which is linked to the hole, and

an adjustment bolt is used to adjust a width of the slit thereby to adjust a size of the hole for insertion of the friction bar.

5. The door opening and closing device of claim 1, wherein the door opening and closing device further comprises a linear damper for braking rotation of the arm just before the arm rotates up to a fully open position or fully closed position.

6. The door opening and closing device of claim 2, wherein the door opening and closing device further comprises a linear damper for braking rotation of the arm just before the arm rotates up to a fully open position or fully closed position.

7. The door opening and closing device of claim 3, wherein the door opening and closing device further comprises a linear damper for braking rotation of the arm just before the arm rotates up to a fully open position or fully closed position.

8. The door opening and closing device of claim 4, wherein the door opening and closing device further comprises a linear damper for braking rotation of the arm just before the arm rotates up to a fully open position or fully closed position.