Drawer rail

Abstract

A drawer rail is used on a table having bottom and a drawer below the bottom of the table with a sidewall, and has a rail device, an auto-returning device and a buffering device. The rail device is mounted with the table and has an inner track attached on the table and having a mounting board and a connecting board and an outer track engaged with the connecting board and immovably attached on the sidewall of the drawer. The auto-returning device is mounted on the rail device and has a base mounted on the connecting board and having an elongated groove, a sliding block movably mounted on the base and a spring mounted in the base. The buffering device is mounted with the auto-returning device, is used to reduce the returning force of the spring and has a jacket and a drive shaft connected with the sliding block.

1 . A drawer rail used on a table having a bottom and a drawer below the bottom of the table with a sidewall, and the drawer rail having
 a rail device adapted to be mounted with the table and having
 an inner track being adapted to attach immovably on the table and having
 a mounting board adapted to be attached on the bottom of the table; and 
 a connecting board formed with the mounting board and having an inner surface; and 
 
 an outer track being slidably engaged with the connecting board of the inner track, adapted to be attached immovably on the sidewall of the drawer and having
 an inner edge being faced to the mounting board; and 
 a pushing post mounted on the inner edge of the outer track and protruding to the inner surface of the connecting board; 
 
   an auto-returning device being mounted on the rail device and having
 a base being mounted on the connecting board of the inner track and having
 an inner open side contacting with the inner surface of the connecting board; 
 a front end; 
 a rear end opposite to the front end; 
 a top; 
 a bottom; 
 a recess being defined in the base near the bottom, extending from the front end to the rear end; and 
 an elongated groove being defined in the base over the recess; 
 
 a sliding block being movably mounted on the base and having
 an inner side contacting with the inner surface of the connecting board; 
 an outer side being faced to the inner open side of the base; 
 a top face; and 
 a limiting cutout being defined in the top face of the sliding block to accommodate the pushing post inside; and 
 
 a spring mounted in the recess and connected between the recess and the sliding block to pull the sliding block; and 
   a buffering device being mounted with the auto-returning device and having
 a jacket being hollow, being securely mounted on the top of the base and having
 a front open end; 
 an inner surface; and 
 a leaking groove being formed radially in the inner surface of the jacket to allow air to flow into the front open end of the jacket; and 
 
 a drive shaft being movably mounted in the jacket, being connected with the sliding block and having
 an inner end extending into the jacket from the front open end of the jacket; 
 an outer end extending out from the front open end of the jacket and being connected to the sliding block; 
 a drive head being movably mounted in the jacket and being mounted securely with the drive shaft; and 
 a sealing ring being movably mounted around the drive head and contacting with the inner surface of the jacket. 
 
   
   
   
       2 . The drawer rail as claimed in  claim 1 , wherein the inner track of the rail device is L-shaped and the connecting board is formed vertically with the mounting board. 
   
   
       3 . The drawer rail as claimed in  claim 1 , wherein the outer track further has a ball bearing race being clamped between the outer track and the connecting board. 
   
   
       4 . The drawer rail as claimed in  claim 1 , wherein
 the connecting board further has multiple hooks protruded from the inner surface; and   the base is semicircle-shaped and further has
 a mounting slab being formed ion the front end of the base and being engaged with one of the hooks in the connecting board; and 
 an engaging block being protruded from the rear end of the base and being engaged with one of the hooks of the connecting board. 
   
   
   
       5 . The drawer rail as claimed in  claim 1 , wherein
 the recess has
 a rear end; 
 a front end; 
 a bottom; 
 a connecting recess being defined in the rear end of the recess and communicating with the recess; and 
 a concave being defined in the bottom of the recess near the front end and communicating with the recess; 
   the sliding block further has
 an inclined bottom selectively engaging with the concave of the recess; and 
 a mounting hole being formed through the sliding block near the inclined bottom and facing to the connecting recess of the recess; and 
   the spring further has
 a first end being mounted in the mounting hole of the sliding block; and 
 a second end being mounted in the connecting recess of the recess. 
   
   
   
       6 . The drawer rail as claimed in  claim 1 , wherein
 the base further has an engaging seat being mounted on the top of the base between the rear end and the front end of the recess and having
 a front edge; and 
 an engaging groove being formed through the front edge of the engaging seat; and 
   the sliding block further has
 a rear face; 
 an inserting slice being formed on the rear face of the sliding block and selectively inserted into the engaging groove of the engaging seat. 
   
   
   
       7 . The drawer rail as claimed in  claim 1 , wherein
 the elongated groove further has
 a long end being formed transversely over the recess; and 
 a short end being formed near the front end of the base; and 
   the sliding block further has two extending portions protruded from the outer side of the sliding block and being extended into the elongated groove between the long end and the short end of the base.   
   
   
       8 . The drawer rail as claimed in  claim 1 , wherein
 the sliding block further has a mounting post protruding from the outer side of the sliding block above the inserting slice;   the drive shaft further has a connecting hole being formed in the outer end of the drive shaft and being connected with the mounting post of the sliding block.   
   
   
       9 . The drawer rail as claimed in  claim 1 , wherein the jacket has
 a rear open end; and   a cover being connected to the rear open end of the jacket.   
   
   
       10 . The drawer rail as claimed in  claim 1 , wherein the drive head further has
 a front slab being connected with the inner end of the drive shaft;   a connecting rod being connected with the front slab and having
 an outer surface; and 
 an allowing groove being formed radially in the outer surface of the connecting rod; and 
   a rear slab being connected to the connecting rod opposite to the front slab and having two through grooves being formed separately in the rear slab, and one of the through grooves communicating with the allowing groove of the connecting rod and the leaking groove in the jacket.   
   
   
       11 . The drawer rail as claimed in  claim 2 , wherein the outer track further has a ball bearing race being clamped between the outer track and the connecting board. 
   
   
       12 . The drawer rail as claimed in  claim 11 , wherein
 the connecting board further has multiple hooks protruding from the inner surface; and   the base is semicircle-shaped and further has
 a mounting slab being formed on the front end of the base and being engaged with one of the hooks in the connecting board; and 
 an engaging block protruding from the rear end of the base and being engaged with one of the hooks of the connecting board. 
   
   
   
       13 . The drawer rail as claimed in  claim 12 , wherein
 the recess has
 a rear end; 
 a front end; 
 a bottom; 
 a connecting recess being defined in the rear end of the recess and communicating with the recess; and 
 a concave being defined in the bottom of the recess near the front end and communicating with the recess; 
   the sliding block further has
 an inclined bottom selectively engaging with the concave of the recess; and 
 a mounting hole being formed through the sliding block near the inclined bottom and facing to the connecting recess of the recess; and 
   the spring further has
 a first end being mounted in the mounting hole of the sliding block; and 
 a second end being mounted in the connecting recess of the recess. 
   
   
   
       14 . The drawer rail as claimed in  claim 13 , wherein
 the base further has an engaging seat being mounted on the top of the base between the rear end and the front end of the recess and having
 a front edge; and 
 an engaging groove being formed through the front edge of the engaging seat; and 
   the sliding block further has
 a rear face; 
 an inserting slice being formed on the rear face of the sliding block and selectively inserted into the engaging groove of the engaging seat. 
   
   
   
       15 . The drawer rail as claimed in  claim 14 , wherein
 the elongated groove further has
 a long end being formed transversely over the recess; and 
 a short end being formed near the front end of the base; and 
   the sliding block further has two extending portions protruding from the outer side of the sliding block and being extended into the elongated groove between the long end and the short end of the base.   
   
   
       16 . The drawer rail as claimed in  claim 15 , wherein
 the sliding block further has a mounting post protruding from the outer side of the sliding block above the inserting slice;   the drive shaft further has a connecting hole being formed in the outer end of the drive shaft and being connected with the mounting post of the sliding block.   
   
   
       17 . The drawer rail as claimed in  claim 16 , wherein the jacket has
 a rear open end; and   a cover being connected to the rear open end of the jacket.   
   
   
       18 . The drawer rail as claimed in  claim 17 , wherein the drive head further has
 a front slab being connected with the inner end of the drive shaft;   a connecting rod being connected with the front slab and having
 an outer surface; and 
 an allowing groove being formed radially in the outer surface of the connecting rod; and 
 a rear slab being connected to the connecting rod opposite to the front slab and having two through grooves being formed separately in the rear slab, and one of the through grooves communicating with the allowing groove of the connecting rod and the leaking groove in the jacket.