Cleanout opening for chimneys

Abstract

The present disclosure teaches a cleanout opening for chimneys. The cleanout chimney is made of precast concrete, which is a corrosion-resistant material that could last for 50-100 years. The cleanout chimney comprises a door and a frame, wherein, the door and the frame are connected via a pair of arc-shaped slots curved toward the back of the door. The use of arc-shaped slots enables the door to be secured tightly in the frame and can be taken out easily by the user. The front face of the door includes two recessions with a gap in the middle, wherein the gap may function as a handle. Additionally, the arced, curving-toward-the-back shape of the door discourages ash, soot, and debris from accumulating on the inner surface of the door. Compared to a hinged door, the door can be fully removed from the frame, which also facilitates the chimney cleaning process.

What is claimed is: 
     
         1 . A cleanout opening for chimneys made of precast concrete, comprising:
 a door, including:
 a bottom part including two recessions on a front surface of the bottom part, with a gap in between the two recessions; 
 two arced rails on two sides of the bottom part;
 wherein, the rails are parallel to each other and identical; 
 wherein, the rails curve toward a back of the door; 
 
 wherein, a back surface of the bottom part is arced to match the two arced rails; 
 a top part above and connecting to the bottom part, wherein a first width of the top is larger than a second width of the bottom part; 
   a frame shaped as a rectangular cuboid, including:
 a hole corresponding to the bottom part of the door; 
 a recession corresponding to the top part of the door; 
 a horizontal protrusion at the bottom of the recession, to hold the door in place; 
 two slots on each side of the hole, wherein the shapes of the two slots match the rails; 
   wherein, a back surface of the top part is shaped to match the shapes of the recession and the horizontal protrusion;   wherein, a user may hold onto the gap via the two recessions to fit the door into the frame by sliding the rails into the slots, and to separate the door from the frame by sliding the rails out of the slots.   
     
     
         2 . The cleanout opening in  claim 1 , wherein the top part of the door is shaped as a rectangle. 
     
     
         3 . The cleanout opening in  claim 1 , wherein the bottom part of the door is shaped as a rectangle. 
     
     
         4 . The cleanout opening in  claim 1 , wherein front views of both recessions are rectangular and identical, and one recession is placed right on top of the other recession. 
     
     
         5 . The cleanout opening in  claim 1 , wherein back surfaces of the two recessions are both arced according to the shapes of the two arced rails. 
     
     
         6 . The cleanout opening in  claim 1 , wherein the gap between the two recessions is rectangular. 
     
     
         7 . The cleanout opening in  claim 1 , wherein the cleanout opening is installed onto a chimney wall by:
 filling one or more spaces between the cleanout opening and edges of a hole in the chimney wall with cast-in-place concrete or mortar.   
     
     
         8 . A cleanout opening for chimneys made of precast concrete, comprising:
 a door, including:
 a bottom part including two recessions on a front surface of the bottom part, with a gap in between the two recessions; 
 two arced slots on two sides of the bottom part;
 wherein, the slots are parallel to each other and identical; 
 wherein, the slots curve toward a back of the door; 
 
 wherein, a back surface of the bottom part is arced to match the two arced slots; 
 a top part above and connecting to the bottom part, wherein a first width of the top is larger than a second width of the bottom part; 
   a frame shaped as a rectangular cuboid, including:
 a hole corresponding to the bottom part of the door; 
 a recession corresponding to the top part of the door; 
 a horizontal protrusion at the bottom of the recession, to hold the door in place; 
 two rails on each side of the hole, wherein the shapes of the two rails match the slots; 
   wherein, a back surface of the top part is shaped to match the shapes of the recession and the horizontal protrusion;   wherein, a user may hold onto the gap via the two recessions to fit the door into the frame by sliding the slots with regard to the rails so that the slots encase the rails, and to separate the door from the frame by sliding the slots with regard to the rails in an opposite direction so that the rails are out of the slots.   
     
     
         9 . The cleanout opening in  claim 8 , wherein the top part of the door is shaped as a rectangle. 
     
     
         10 . The cleanout opening in  claim 8 , wherein the bottom part of the door is shaped as a rectangle. 
     
     
         11 . The cleanout opening in  claim 8 , wherein front views of both recessions are rectangular and identical, and one recession is placed right on top of the other recession. 
     
     
         12 . The cleanout opening in  claim 8 , wherein back surfaces of the two recessions are both arced according to the shapes of the two arced rails. 
     
     
         13 . The cleanout opening in  claim 8 , wherein the gap between the two recessions is rectangular. 
     
     
         14 . The cleanout opening in  claim 8 , wherein the cleanout opening is installed onto a chimney wall by:
 filling one or more spaces between the cleanout opening and edges of a hole in the chimney wall with cast-in-place concrete or mortar.   
     
     
         15 . A chimney including one or more cleanout openings,
 wherein, each cleanout opening of the one or more cleanout openings includes:
 a door, including:
 a bottom part including two recessions on a front surface of the bottom part, with a gap in between the two recessions; 
 two arced rails on two sides of the bottom part;
 wherein, the rails are parallel to each other and identical; 
 wherein, the rails curve toward a back of the door; 
 
 wherein, a back surface of the bottom part is arced to match the two arced rails; 
 a top part above and connecting to the bottom part, wherein a first width of the top is larger than a second width of the bottom part; 
 
 a frame shaped as a rectangular cuboid, including:
 a hole corresponding to the bottom part of the door; 
 a recession corresponding to the top part of the door; 
 a horizontal protrusion at the bottom of the recession, to hold the door in place; 
 two slots on each side of the hole, wherein the shapes of the two slots match the rails; 
 
 wherein, a back surface of the top part is shaped to match the shapes of the recession and the horizontal protrusion; 
 wherein, a user may hold onto the gap via the two recessions to fit the door into the frame by sliding the rails into the slots, and to separate the door from the frame by sliding the rails out of the slots. 
   
     
     
         16 . The chimney in  claim 15 , wherein the top part of the door is shaped as a rectangle. 
     
     
         17 . The chimney in  claim 15 , wherein the bottom part of the door is shaped as a rectangle. 
     
     
         18 . The chimney in  claim 15 , wherein front views of both recessions are rectangular and identical, and one recession is placed right on top of the other recession. 
     
     
         19 . The chimney in  claim 15 , wherein back surfaces of the two recessions are both arced according to the shapes of the two arced rails. 
     
     
         20 . The chimney in  claim 15 , wherein the gap between the two recessions is rectangular.