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| Number | Title | Issue Date |
| 7338051 | Tool holder for a rotary hammer A tool holder (1) for a rotary hammer which has a tube like tool holder main body (10) having a side wall formed with through holes (11) for receiving corresponding locking bodies (12) and formed with additional through holes (40).... | 03/04/2008 |
| 7258350 | Chuck for receiving a rotary-percussion tool A chuck for receiving a working tool (2) rotable about a longitudinal axis (A) includes a receiving sleeve (3) having a guide surface (12) extending along the longitudinal axis (A) and at least three, axially extending, up to a free end surface ... | 08/21/2007 |
| 7073607 | Operating system for hydraulic rock drill A hydraulic rock drill comprises a housing having a piston and valve bore formed therein, a rotation motor, and a fluid connection and fluid reservoir interposed between the housing and the rotation motor. Fluid connections to the hydraulic rock drill comprise a sin... | 07/11/2006 |
| 6938702 | Method and equipment for controlling operation of rock drilling apparatus A method and an equipment for controlling the operation of a rock drilling apparatus, which rock drilling apparatus comprises a percussion device for producing impact energy to a tool of the rock drilling apparatus, a rotating device for rotating the tool in a drill... | 09/06/2005 |
| 6883620 | Device for hydraulic power supply of a rotary apparatus for percussive drilling A device for supplying hydraulic power to a rotary apparatus for percussive drilling (2) whereof the tool (3) is driven in one direction or another and subjected to the action of an impact device (6) acting independently of the rotation, of a hy... | 04/26/2005 |
| 6681870 | Hydraulic actuator The invention concerns an hydraulically powered mechanism of the kind having a piston assembly which is arranged to be driven by hydraulic fluid acting on it in a working zone and an item of equipment which is to be driven by the piston assembly. The pist... | 01/27/2004 |
| 6119793 | Rock drill The rock drill (9) includes a reversible rotary motor (10) and a percussion unit (11) with a percussion valve (17). Rotary unit and Percussion unit (11) are operated via separate valves (39, 46) in a control unit (34). The percussion frequency of the perc... | 09/19/2000 |
| 5064003 | Hydraulic drilling machine A hydraulic drilling machine has a drilling tool connected to a hydraulic motor, a hydraulic percussive mechanism connected through a rotatable fluid distributor to pressure and discharge lines, and a flow governor made up of a non-return valve and a flow... | 11/12/1991 |
| 4355691 | Hydraulic drilling apparatus A hydraulic drilling apparatus, especially a rock drill comprising a body, a cylinder in the body and a percussion piston reciprocating in the cylinder. A tool is connected to the body and a motor is provided for rotating the tool. A control valve is also... | 10/26/1982 |
| 4291771 | Rotary percussion hydraulic drilling machine A rotary percussion hydraulic drilling machine has striker piston slidably mounted inside a cylinder which defines a first annular chamber connected to a one-way valve slidably mounted inside a chamber connected to an accumulator comprising a diaphragm, l... | 09/29/1981 |
| 4106573 | Drill This invention relates generally to improved means for securing a working member within a rotary tool and is described hereinbelow with particular reference to a percussively actuatable striking bar secured by the novel securing means hereof within a perc... | 08/15/1978 |
