Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
240 words
A dental handpiece for a motor driven reamer comprising a cylindrical member having a cup bearing coupled to its upper end and an annular bearing disposed in an opening in its lower end, wherein an annular space is formed in said cylindrical member between said cup bearing and said annular bearing, a portion of the side wall of said cylindrical member partially projecting into said annular space to form a lateral cylinder for receiving a worm gear, an annular member secured to said cup bearing, said annular member having a bottom face inclined with respect to the axis thereof, a bushing having a worm wheel around the central portion thereof, said bushing being rotatably inserted into said cylindrical member, the top face of said bushing being inclined with respect to the axis thereof thereby forming a cam mechanism with the bottom face of the annular member, said bushing having an annularly widened opening therein adjacent its lower end to receive a collet chuck, a plurality of springs inserted at intervals in an annular space formed between the bottom of said worm wheel and the top of said annular bearing, a shank of a reamer inserted into said bushing through said collet chuck, said shank being firmly held therein, a head cap engaging the upper portion of said cylindrical member for covering said cup bearing, and said worm gear being inserted into said lateral cylinder to mesh with said worm wheel.
Claim 2
Dependent Claim
240 words
A dental handpiece for a motor driven reamer comprising a cylindrical member having a cup bearing coupled to its upper end and an annular bearing disposed in an opening in its lower end, wherein an annular space is formed in said cylindrical member between said cup bearing and said annular bearing, a portion of the side wall of said cylindrical member partially projecting into said annular space to form a lateral cylinder for receiving a worm gear, an annular member secured to said cup bearing, said annular member having a bottom face inclined with respect to the axis thereof, a bushing having a worm wheel around the central portion thereof, said bushing being rotatably inserted into said cylindrical member, the top face of said bushing being inclined with respect to the axis thereof thereby forming a cam mechanism with the bottom face of the annular member, said bushing having an annularly widened opening therein adjacent its lower end to receive a collet chuck, a plurality of springs inserted at intervals in an annular space formed between the bottom of said worm wheel and the top of said annular bearing, a shank of a reamer inserted into said bushing through said collet chuck, said shank being firmly held therein, a head cap engaging the upper portion of said cylindrical member for covering said cup bearing, and said worm gear being inserted into said lateral cylinder to mesh with said worm wheel.
Claim 3
Dependent Claim
35 words
The structure described in claim 1, wherein said reamer protrudes a substantial distance beyond said bushing and is driven to continuously rotate and move axially with respect to said cylindrical member at a reduced speed.