# US 5,702,160 A · Tool for crushing hard material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,702,160 A - Document ID: US5702160A - Status: Granted - Kind: A - Application number: 08/693,294 - Filed: 1996-08-16 - Granted: 1997-12-30 - Earliest claimed: 1996-08-16 - Inventors: Igor Anatolyevich Levankovskii; Yurii Alexandrovich Grinevitskii; Victor Danilovich Shults; Yurii Victorovich Alexandrov - Web page: https://patentgrep.com/patent/US5702160A ## CPC - E21C 35/183: with inserts or layers of wear-resisting material {(drill bits with wear-resistant parts E21B10/46)} - E21C 35/1831: {Fixing methods or devices} - E21C 35/1837: {characterised by the shape} - E21C: MINING OR QUARRYING ## Abstract The concept of invention: a tool for crushing hard material comprises a housing and a hard-alloy insert mounted on the latter. The insert is made up of a head portion, an intermediate portion and a base with a thrust face. The intermediate portion of the insert is formed by a body of revolution with an outer lateral surface of concave shape. The head portion of the insert is formed by a body of revolution with an outer lateral surface of convex shape. The lateral side of the head portion of the insert is smoothly located adjacent to the lateral side of the intermediate portion of the insert. The length of the intermediate portion of the insert about its longitudinal axis does not exceed the length of the head portion of the insert about the same axis. ## Claims ### Claim 1 A tool for crushing hard material, comprising a housing and a hard-alloy insert mounted on the housing and having a head portion, a base with a thrust face for interaction with a supporting surface of the housing and an intermediate portion interposed between the head portion and the base and formed by a body of revolution with an outer lateral surface of concave shape, characterized in that the head portion of the insert is formed by a body of revolution with an outer lateral surface of convex shape, and the lateral side of said head portion of the insert is smoothly located adjacent to the lateral surface of its intermediate portion, the length of the intermediate portion of the insert about its longitudinal axis not exceeding the length of the head portion of the insert about the same axis. ### Claim 2 (depends on 1) A tool as claimed in claim 1, characterized in that the base of the insert has the shape of a cylinder of rotation, whose longitudinal axis is arranged on the longitudinal axis of symmetry of the insert. ### Claim 3 (depends on 2) A tool according to claim 2, characterized in that the insert has a shank for arrangement in a nest of the housing of the tool. ### Claim 4 (depends on 2) A tool according to claim 2, characterized in that the insert has a nest for the arrangement of a projection on the end portion of the housing of the tool. ### Claim 5 (depends on 1) A tool according to claim 1, characterized in that the insert has a shank for arrangement in a nest of the housing of the tool. ### Claim 6 (depends on 5) A toll as claimed in claim 5, characterized in that the shank has the shape of two truncated cones of rotation which are inter-conjugated at the bases thereof and the axes of which are arranged on the longitudinal axis of symmetry of the insert, the diameter of a larger base of a truncated cone being equal to the diameter of the base of the insert, the verticies of said truncated cones being oriented in one direction in relation to the base of the insert. ### Claim 7 (depends on 6) A tool as claimed in claim 6, characterized in that an angle of inclination of the generating line of a truncated cone which adjoins the base of the insert, to the longitudinal axis of symmetry of the insert constitutes at least 30.degree. and no more than 80.degree.. ### Claim 8 (depends on 6) A tool as claimed in claim 6, characterized in that the angle of inclination of the generating line of a truncated cone being conjugate at its larger base with a smaller base of the other truncated cone, to the longitudinal axis of symmetry is at least 78.degree. and no more than 86.degree.. ### Claim 9 (depends on 6) A tool as claimed in claim 6, characterized in that the shank of the insert has projections for centering the insert in the nest of the housing of said tool and for forming the specified layer of material for the connection of the insert with the housing of the tool. ### Claim 10 (depends on 5) A tool as claimed in claim 5, characterized in that the shank of the insert has projections for centring the insert in the nest of the housing of said tool and for forming the specified layer of material for the connection of the insert with the housing of the tool. ### Claim 11 (depends on 10) A tool as claimed in claim 10, characterized in that the projections are arranged on the lateral surface of a truncated cone which is adjacent the base of the insert. ### Claim 12 (depends on 11) A tool as claimed in claim 11, characterized in that the projections are uniformly arranged about a circle whose center is situated on the longitudinal axis of the insert. ### Claim 13 (depends on 10) A tool as claimed in claim 10, characterized in that the projections are uniformly arranged about a circle whose center is situated on the longitudinal axis of the insert. ### Claim 14 (depends on 10) A tool as claimed in claim 10, characterized in that the number of projections is six. ### Claim 15 (depends on 1) A tool according to claim 1, characterized in that the insert has a nest for the arrangement of a projection on the end portion of the housing of the tool. ### Claim 16 (depends on 15) A tool according to claim 15, characterized in that the nest has projections for centring the insert with respect to a projection on the end portion of the housing of the tool and for forming the specified layer of material for connection of the insert with the housing of the tool. ### Claim 17 (depends on 16) A tool according to claim 16, characterized in that the projections are provided in the bottom of the nest of the insert. ### Claim 18 (depends on 17) A tool as claimed in claim 17, characterized in that the projections are arranged on the walls of the nest of the insert. ### Claim 19 (depends on 16) A tool as claimed in claim 16, characterized in that the projections are arranged on the walls of the nest of the insert. ### Claim 20 (depends on 16) A tool as claimed in claim 16, characterized in that the projections are uniformly arranged about a circle with its center situated on the longitudinal axis of symmetry of the insert.