Auto-returning assembly with mechanical damper

Abstract

An auto-returning assembly with mechanical damper is used in conjunction with a drawer rail and has a body, a rack, a locking protrusion, at least one spring and a damper. The body has a base and a guiding mount. The guiding mount is formed on the base and has a guide slot. The rack is mounted slidably on the body. The locking protrusion is mounted rotatably on the rack and slidably in the guiding slot and has a pivoting protrusion and a locking post. The at least one spring is connected to the body and the rack. The damper is connected securely to the body and engages the rack and has a casing and a buffering wheel. When the spring pulls the drawer rails back, rack forces the damper wheel to turn that encounters high resistance and slows the movement of the drawer rail.

1 . An auto-returning assembly with mechanical damper for a drawer rail having
 a body having
 a base having a front end;
 a rear end; and 
 a recess being defined in the base between the front end and the rear end; and 
 
 a guiding mount being formed on the base in the recess near the front end and having
 a front end; 
 a rear end; 
 two sidewalls; 
 a top face; 
 an opening being formed in the rear end of the guiding mount; and 
 a guide slot being formed through the top face of the guiding mount, communicating with the opening and having
 a locking section being defined in the guide slot nears the front of the guide mount; 
 
 
   a rack being mounted slidably on the base and in the guiding mount and having
 a proximal end being mounted slidably in the opening of the guiding mount; 
 a side edge; and 
 multiple teeth being formed on the side edge of the rack; 
   a locking protrusion being mounted rotatably on the rack and having
 a pivoting protrusion being formed on and protruding from the locking protrusion and being mounted rotatably in the proximal end of the rack; and 
 a locking post being formed on and protruding from the locking protrusion and being mounted slidably in the guide slot and selectively engaging the locking section; 
   at least one spring being connected to the body and the rack; and   a damper being mounted securely on the base and engaging with the teeth of the rack and having
 a casing being mounted securely in the base and having a resistance medium contained in the casing; and 
 a buffering wheel being mounted rotatably on the casing and engaging with the teeth of the rack, wherein the resistance medium provides a damping effect to the buffering wheel when the buffering wheel rotates in a direction. 
   
   
   
       2 . The auto-returning assembly for a drawer rail as claimed in  claim 1 , wherein
 the casing having
 an external surface; 
 a top; and 
 a chamber being defined in the casing; 
   
     wherein the resistance medium being added to fill the chamber of the casing; and
 the buffering wheel having
 an interior end extending into the chamber of the casing; 
 an exterior end extending out of the top of the casing; 
 a gear wheel being mounted around the exterior end of the buffering wheel and engaging with the teeth of the rack; and 
 a vane wheel being mounted around the interior end of the buffering wheel, being surrounded by the resistance medium and having
 a disk being mounted around the inner end of the buffering wheel; and 
 multiple vanes being formed on and protruding from the disk and each vane having
 a curved side; and 
 a flat side being formed opposite to the curved surface. 
 
 
 
 
   
   
       3 . The auto-returning assembly for a drawer rail as claimed in  claim 2 , wherein
 the rack further has two arms being respectively formed on the proximal end of the rack; and   two springs are connected to the arms of the rack.   
   
   
       4 . The auto-returning assembly for a drawer rail as claimed in  claim 3 , wherein
 the guiding mount of the body further has two channels respectively being formed through the sidewalls of the guiding mount; and   the arms of the rack being respectively mounted slidably in the channels.   
   
   
       5 . The auto-returning assembly for a drawer rail as claimed in  claim 4 , wherein
 the body further has a connecting panel being formed on the rear end of the base and having
 two spring mounts being formed through the connecting panel and communicating with the recess of the base; and 
   the springs are connected to the spring mounts of the connecting panel.   
   
   
       6 . The auto-returning assembly for a drawer rail as claimed in  claim 5 , wherein
 the base further has
 a protecting bar being convex, being formed on and protruding from the front end of the base; and 
 a damper mount being formed through the base adjacent to the opening; 
   the rack further has a pivot hole being formed through the proximal end of the rack;   the pivoting post of the locking protrusion is mounted in the pivot hole;   the casing of the damper being mounted in the damper mount and further has two connecting wings formed on the external surface of the casing and mounted securely on the base.