Return Device for a Slide Drawer

Abstract

A return device for a slide 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 slide surface of the positioning concave of the positioning member and the track is acute, 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.

1 . A return device for a slide 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 and an engaging portion, one end of the slide slot being located corresponding to the track of the positioning member, the engaging portion having a slope located close to the slide slot;   an elastic member connected to the positioning member and the pulling member;   the slide block having a protrusion to be received in the slide slot of the pulling member and a slide portion to be received in the track and to abut against the slope of the engaging portion of the pulling member; and   an actuator including an actuating slot for receiving the protrusion of the slide block, the slide portion of the slide block being employed to slide on the slope of the engaging portion of the pulling member to make the protrusion of the slide block slide in and out of the positioning concave of the track, the above arrangements allow the slide drawer to be positioned after being pulled out or to be released into a non-positioned state and automatically return back to its initial position.   
   
   
       2 . The return device for a slide drawer as claimed in  claim 1 , wherein a receiving concave is formed at the other side of the track of the positioning member opposite the positioning concave and provided for accommodation of the slide portion of the slide block. 
   
   
       3 . The return device for a slide drawer as claimed in  claim 1 , wherein the slide portion of the slide block has a top portion to be abutted against the slope of the engaging portion of the pulling member. 
   
   
       4 . The return device for a slide drawer as claimed in  claim 1 , wherein the track of the positioning member defines an acute angle with respect to the positioning concave. 
   
   
       5 . The return device for a slide drawer as claimed in  claim 1 , wherein the pulling member includes a buffering portion located at one side thereof opposite the engaging portion and employed to contact the positioning member. 
   
   
       6 . The return device for a slide drawer as claimed in  claim 1 , wherein the elastic member is a spring or elastic string. 
   
   
       7 . The return device for a slide drawer as claimed in  claim 1  further comprising a buffering cylinder connected to the positioning member and the pulling member. 
   
   
       8 . The return device for a slide drawer as claimed in  claim 7 , wherein the buffering cylinder and the elastic member are disposed at both sides of the positioning member. 
   
   
       9 . The return device for a slide drawer as claimed in  claim 7 , wherein the buffering cylinder is an oil cylinder. 
   
   
       10 . The return device for a slide drawer as claimed in  claim 7 , wherein the buffering cylinder is an air cylinder.