Multiple-purpose roaster
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a multiple-purpose roaster having a grill and a trivel that are replaceable with each other for selective use as a meat roaster or a meat-boiling pot known as a &#34;shab-shab&#34; pot. 
     2. Description of the Prior Art 
     Prior roasters available on the market are designed for exclusive use for roasting meat. The roaster has a grill positioned above a burner in a roaster body. However, the grill cannot be replaced with another cooking means. Therefore, roasters for commercial use have been employed solely in restaurants where main dishes are grilled meat, but not in other restaurants. Home-use roasters also cannot be used in various ways of cooking other than roasting meat, one example being &#34;shab-shab&#34; in which thin slices of meat are boiled in a pot of boiling water. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to povide a multiple-purpose roaster which can be used in different ways. 
     According to the present invention, there is provided a multiple-purpose roater comprising a cylindrical casing having an annular step extending along an inner peripheral surface thereof below an upper open end thereof, a burner disposed in the cylindrical casing below the annular step, and a grill and a trivet which are replaceable with each other and selectively placed on the annular step. 
     The above and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which preferred embodiments of the present invention are shown by way of illustrative example. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a multiple-purpose roaster according to the present invention; 
     FIG. 2 is an enlarged fragmentary cross-sectional view taken along A--A&#39; of FIG. 1, and 
     FIG. 3 is a perspective view of a grill and a trivet that can selectively be used in the multiple-purpose roaster. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As shown in FIG. 1, a roaster according to the present invention has a roaster body 1 including a table 2 having a substantially central circular opening 3. As illustrated in FIG. 2, the roaster comprises an outer cylindrical casing 5 fitted in the circular opening 3 and including a downwardly tapered smoke tube 4 connected to an appropriate smoke suction means (not shown). An inner cylindrical casing 7 is disposed centrally in the outer casing 5 with a smoke outlet passage 6 defined therebetween and communicating with the smoke tube 4. 
     The inner casing 7 has a plurality of circumferentially spaced teeth 8, 8&#39; projecting radially inwardly from an inner peripheral surface thereof. A dish-shaped member 9 has an upper annular flange 10 extending radially outwardly from an outer peripheral edge thereof and placed on the teeth 8, 8&#39;. The flange 10 on the teeth 8, 8&#39; and the inner peripheral wall of the inner casing 7 define an annular step or shoulder 11 disposed below an upper open end of the inner casing 7. 
     As shown in FIG. 3, a meat-roasting grill 12 is of a circular shape having a plurality of circumferentially equally spaced slots 13, 13&#39; extending radially therein. A ring-shaped trivet or pot support 14 has a plurality of circumferentially equally spaced arms 15, 15&#39; projecting radially inwardly thereform, the trivet 14 serving to support a &#34;shab-shab&#34; pot, for example. The grill 12 and the trivet 14 are of an outside diameter such that they can snugly fit in the inner casing 7. In use, either the grill 12 or the trivet 14 is placed on the step 11. 
     In FIG. 2, the outer and inner casings 5, 7 have radially aligned holes jointly defining a radial air inlet passage 16 for introducing air from outside of the outer casing 5 into the inner casing 7 below the member 9. A gas burner 18 is fixed to the bottom of the dish-shaped member 9 centrally within the inner casing 7. A gas tube 17 extends through the air inlet passage 16 and has an end connected to the gas burner 18. 
     A circular top member 19 is disposed in the opening 3 in the table 2 and has an sleevelike circular wall 23 extending downwardly into the upper open end of the inner casing 7, the circular wall 23 having a lower edge held against an upper inner peripheral surface of the inner casing 7 and defining a circular opening 20 communicating with the interior of the inner casing 7. The circular wall 23 has a plurality of round holes 24, 24&#39; defined therein in circumferentially spaced relation and communicating with the smoke outlet passage 6 between the inner and outer casings 7, 5. The outer casing 5 has an upper flange 22 projecting radially outwardly from an upper edge thereof and resting on a circular marginal edge of the table 2 which defines the opening 3. The outer casing 5 also has an annular slot 21 defined radially inwardly of the upper flange 22 and receiving therein an annular wall extending downwardly from an outer peripheral edge of the top member 19. 
     In use, the grill 12 or the trivet 14 is selectively placed on the step 11. Where the grill 12 is employed, sliced pieces of meat can be roasted on the grill 12. Where the trivet 14 is used, a &#34;shab-shab&#34; pot for example can be placed on the trivet 14. Therefore, the roaster of the present invention can be used selectively as a meat roaster or a &#34;shab-shab&#34; cooker.