Garbage Bin Descending Control System

Abstract

A descending control system for a garbage bin includes a bin provided with a pedal to control an active rod to ascend and descend to open and close a lid. A gear and a rack are provided in the bin. Both the gear and the rack are disposed with teeth to engage with each other. The height of the teeth on the rack decreases from a first end toward a second end of the rack. The engagement between the teeth of the gear and the teeth of the rack reduces the closing speed of the lid.

1 . A descending control system for a garbage bin comprising a bin pivotally connected with a lid; a gear and a rack being provided in the bin; the gear being annularly disposed with a plurality of teeth; the rack being disposed with a plurality of teeth to engage with the teeth of the gear; the rack having a first end and a second end; and the height of each of the teeth of the rack decreasing from the first end toward the second end of the rack. 
   
   
       2 . The descending control system for a garbage bin as claimed in  claim 1 , wherein the rack is a straight rack. 
   
   
       3 . The descending control system for a garbage bin as claimed in  claim 1 , wherein the gear and the rack are secured to a locating base, and the locating base is secured to a bottom of the bin. 
   
   
       4 . The descending control system for a garbage bin as claimed in  claim 3 , wherein an oval slot at a proper inclination is disposed on the locating base; an axle of the gear is inserted into the oval slot; and spacing is kept between a rear wall edge of the rack and an inner wall of the locating base. 
   
   
       5 . The descending control system for a garbage bin as claimed in  claim 1 , wherein the height of a first tooth of the first end is greater than the height of a last tooth of the second end of the rack. 
   
   
       6 . A descending control system for a garbage bin comprising a bin pivotally connected with a lid; the lid having a pivoting portion; a gear secured in the pivoting portion of the lid; the gear being annularly provided with a plurality of teeth; a rack being secured in the lid; the rack being disposed with a plurality of teeth to engage with the teeth of the gear; the rack having a first end and a second end; and the height of each of the teeth of the rack decreasing from the first end toward the second end of the rack. 
   
   
       7 . The descending control system for a garbage bin as claimed in  claim 6 , wherein the rack is a straight rack. 
   
   
       8 . The descending control system for a garbage bin as claimed in  claim 6 , wherein the lid is pivotally connected with two lid panels; an active rod is provided in the bin to open the lid panels; two pull boards are pivotally connected with respective ends of the two lid panels; the rack is secured to one of the pull boards; the active rod in the bin is connected to the other pull board; a spring is provided on one side of each of the lid panels. 
   
   
       9 . The descending control system for a garbage bin as claimed in  claim 6 , wherein the height of a first tooth of the first end is greater than the height of a last tooth of the second end of the rack.