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Class Information
Number: 299/23
Name: Mining or in situ disintegration of hard material > Expansible breaking-down devices > Wedge
Description: Apparatus in which the device comprises relatively movable elements, and an inclined face on one element cooperates with a face on another element to generate expansive pressure.










Patents under this class:

Patent Number Title Of Patent Date Issued
7188910 Crushing structure of crusher Mar. 13, 2007
6948573 Rock breaker tool Sep. 27, 2005
5398998 Pressure actuated fracture device Mar. 21, 1995
5076374 Drilling device with an impact-rotation tool Dec. 31, 1991
5020859 Apparatus for disintegrating monolythic entities Jun. 4, 1991
5015039 Hydraulically actuated mechanical rock excavator May. 14, 1991
5000517 Powered member for splitting rock and other bodies Mar. 19, 1991
4871212 Device for building up directional force Oct. 3, 1989
4865391 Apparatus for building-up bursting forces Sep. 12, 1989
4790602 Fluid actuated apparatus for mechanically splitting rock-like material Dec. 13, 1988
4781418 Fluid actuated apparatus for mechanically splitting rock-like material Nov. 1, 1988
4690460 Power unit Sep. 1, 1987
4571002 Hydraulic rock splitter Feb. 18, 1986
4566736 Apparatus for mechanically breaking up rock Jan. 28, 1986
4474410 Power-driven, wedge-operated rock splitter Oct. 2, 1984
4299347 Device for removal of casting deadhead by hydraulic wedge Nov. 10, 1981
4273383 Mineral winning machines Jun. 16, 1981
4254808 Wedging apparatus useful for log splitting Mar. 10, 1981
4252375 Wear or thrust plates for hydraulic rock splitting apparatus Feb. 24, 1981
4215901 Hydraulically actuated tool for mechanically splitting rock-like material Aug. 5, 1980
4190293 Rock splitting attachment for a breaking hammer Feb. 26, 1980
4168862 Wear or thrust plates for hydraulic rock splitting apparatus Sep. 25, 1979
4152028 Expansible apparatus for removing the surface layer from a concrete object May. 1, 1979
4114951 Hydraulically actuated tool for mechanically splitting rock-like material Sep. 19, 1978
4114950 Method and apparatus for breaking a hard compact material such as rock or concrete Sep. 19, 1978
4099784 Method and apparatus for breaking hard compact material such as rock Jul. 11, 1978
4071095 Methods of and apparatus for winning reef Jan. 31, 1978
4026602 Apparatus for mechanically breaking up stone or reinforced concrete May. 31, 1977











 
 
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