RETURN DEVICE FOR A DRAWER

• US 20120144622A1
• Filed: 02/24/2012
• Published: 06/14/2012
• Est. Priority Date: 12/30/2008
• Status: Active Grant

• Current Assignee: Sun Chain Metal Industry Co., Ltd.
• Original Assignee: Sun Chain Metal Industry Co., Ltd.
• Inventors: JUAN, TENG-YI, Chen, Shih Wang
• Granted Patent: US 8,393,693 B2
• Time in Patent Office: Days
• US Class Current: 16/51
• CPC Class Codes: A47B 88/467 self-closing

Abstract

A return device for a drawer employs an actuator to drive a slide block, when the drawer is pulled open, the slide block is moved into a positioning concave and positioned therein while stretching an elastic member. Or pushing the drawer back can make the slide block slide out of the positioning concave, meanwhile, the elastic member pulls the drawer back to its original position. Furthermore, since the angle between the slide surface of the positioning concave of the positioning member and the track is obtuse, it is easy for the slide block to slide in and out, so that the drawer can be easily positioned and unlocked from the positioned state.

Claims

1. A return device for a drawer comprising:

a positioning member having a track and a positioning concave formed at one side of the track;

a pulling member slidably disposed on the positioning member and having a slide slot;

an elastic member connected to the positioning member and the pulling member;

a slide block having a protrusion to be received in the slide slot of the pulling member and a slide portion to be disposed in the track of the positioning member, and the protrusion being located close to one end of the slide portion; and

an actuator including an actuating slot for receiving the protrusion of the slide block and capable of making the protrusion of the slide bock slide in and out of the positioning concave of the track;

characterized in that;

the positioning concave has a slide surface which defines an obtuse angle with respect to the track, and the obtuse angle is 235-245 degrees, at one end of the slide portion are formed an indentation and an arch-shaped top portion, the pulling member is formed on a surface thereof for slidably contacting the positioning member with an engaging portion, the engaging portion includes a slope formed in a longitudinal direction thereof, so that the top portion is able to move by pivoting against the slope of the engaging portion of the pulling member, the indentation of the slide portion makes room for a protruding corner of the slope of the engaging portion during rotation of the slide portion, so that another end of the slide portion is able to drive the protrusion to move from a slide end to a positioning end of the slide slot.

2. The return device for a drawer as claimed in claim 1, wherein the pulling member further includes a buffering portion located at one side thereof opposite the engaging portion and employed to contact the positioning member.

3. The return device for a drawer as claimed in claim 1 further comprising a buffering cylinder with two ends connected to the positioning member and the pulling member, respectively.

4. The return device for a drawer as claimed in claim 3, wherein the elastic member and the buffering cylinder are disposed at both sides of the positioning member.

5. The return device for a drawer as claimed in claim 3, wherein the buffering cylinder is an oil pressure cylinder.

6. The return device for a drawer as claimed in claim 3, wherein the buffering cylinder is an air cylinder.

7. The return device for a drawer as claimed in claim 1, wherein the obtuse angle is preferably 240 degrees.