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| Number | Title | Issue Date |
| 7658237 | Power tool having mode controller The invention discloses a power tool having a motor adapted to drive a tool, comprising at least one switching element, coupled with a controller, for actuation of the motor, the controller being configured so that the motor can be switched on for driving the tool o... | 02/09/2010 |
| 7617884 | Drill slide for rock drilling apparatus A drill slide (1) for a drilling apparatus, the slide (1) adapted to slidably support a drifter (6), the slide (1) comprising a telescopic shaft (2) having a first elongate member (3) telescopically slidable with respect to ... | 11/17/2009 |
| 7413029 | Screw fastening machine The present invention aims to provide a screw fastening machine for reliably switching and changing a driving force transmitting path with the seating on a work as a reference. According to the screw fastening machine in which a first pulley is connected to a... | 08/19/2008 |
| 7401659 | Positioning structure of the transmission device of a screw fastening apparatus A positioning structure of the transmission device of a screw fastening apparatus is disclosed. The transmission device includes a stopping block, gear body and a braking body. An elastic rim is positioned between the lateral side of the stopping block and the inner... | 07/22/2008 |
| 7398834 | Hammer drill with selective lock-on A hammer drill comprising: a motor; a drive transmission capable of operating in at in at least a rotary mode and a reciprocating mode; a mode change mechanism; a switch which, when closed, provides power to the motor; and a mechanical lock-on mechanism which, when ... | 07/15/2008 |
| 7357196 | Method and system for predicting performance of a drilling system for a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation includes generating a geology characteristic of the formation per unit depth according to a prescribed geology model, obtaining specificat... | 04/15/2008 |
| 7350593 | Electronically controlled earth drilling rig An electronic control, for automated earth drilling using a pneumatic hammer-operated bit, preliminarily weighs a drill string, and, during drilling, automatically maintains a desired weight on the bit, and also maintains a constant rate of drilling progress by regu... | 04/01/2008 |
| 7322425 | Method of generating stress pulse in tool by means of pressure fluid operated impact device, and impact device A method of generating a stress pulse, and an impact device. In the method, pressure fluid is fed as pressure pulses to a working chamber residing between the frame of the impact device and a tool such that the resulting force presses the tool towards the material t... | 01/29/2008 |
| 7320369 | Vibration reduction apparatus for power tool and power tool incorporating such apparatus A power tool has a handle assembly which is biased by a torsional spring. The torsional spring has an engaging arm the position of which is fixed relative to the housing by an adjusting mechanism. The adjusting mechanism has a lever which extends outside the housing... | 01/22/2008 |
| 7296475 | Displacement instrument for determining the modulus of a material A novel displacement instrument that can be used to measure the density or modulus of an aggregate pier upon which a multistory building or parking garage can be built. The aggregate piers are often 35 feet or deeper. These aggravate piers are constructed by adding ... | 11/20/2007 |
| 7289871 | Drilling apparatus The invention provides a drilling apparatus (1) having a base (2) from which a drilling arm is pivotally mounted. The drilling arm (3) has an inner arm (4) and an outer arm (5). The inner arm (4) has a first end (6) a... | 10/30/2007 |
| 7267182 | Rock drilling rig and rock breaking machine The rock drilling rig comprises a first control unit (8) arranged on a carrier (1) and a second control unit (9) arranged to a rock drilling apparatus (4). The first control unit (8) and the second control unit (9) communica... | 09/11/2007 |
| 7261167 | Method and system for predicting performance of a drilling system for a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation is disclosed. The method generates a geology model of a given formation. The geology model includes a geology characteristic of the given ... | 08/28/2007 |
| 7228899 | Warning device and method to prevent clutch burning This invention is generally directed towards a system designed to assist the rig operator by alerting him/her that the air pressure is too low to be using the drum clutch, to provide a log for studies on rig operation technique, and to provide a training tool for ri... | 06/12/2007 |
| 7198117 | Method and arrangement for controlling percussion rock drilling The invention relates to a rock drilling arrangement and a method and program for controlling rock drilling on the basis of specific energy consumption. The specific energy of drilling is the quantity of energy used per a unit of length of the drilled hole. Not only... | 04/03/2007 |
| 7185713 | Air-driven screwdriver performs hole drilling, thread tapping and bolt tightening A novel air-driven screwdriver is integrally designed to perform three functions, hole drilling, thread tapping and bolt tightening with special characteristic in which a passive inner gear assembly is employed as a driver to replace the clutch as used by the prior ... | 03/06/2007 |
| 7165478 | Pneumatically operated screw driver A pneumatically operated screw driver ensuring a complete return of a piston to its top dead center. The screw driver has a compressed air return chamber for returning the piston to its top dead center by applying a compressed air in the return chamber to the piston... | 01/23/2007 |
| 7143920 | Primary and secondary handles for power tool A housing for a power tool includes a primary handle configured for accommodating a primary hand used to control the operation of the tool, the handle having a first end closer to a power source of the tool, and a second end distal of the power source, a secondary h... | 12/05/2006 |
| 7104433 | Safety apparatus of air impact driver A nose (5) of an air impact driver (1) is mounted with a slidable contact nose (12) and by the contact nose, a contact valve (23) upward therefrom is operated to switch. An AND circuit operated to pilot an air motor controlling pilot valv... | 09/12/2006 |
| 7085696 | Iterative drilling simulation process for enhanced economic decision making An iterative drilling simulation method and system for enhanced economic decision making includes obtaining characteristics of a rock column in a formation to be drilled, specifying characteristics of at least one drilling rig system; and iteratively simulating the ... | 08/01/2006 |
| 7080958 | Vibratory pile driver/extractor with two-stage vibration/tension load suppressor A method and apparatus for driving and extracting piles that includes a vibration/tension load absorber assembly mounted between a housing and the vibratory unit which includes shear-type vibration absorbers connected between the housing and the vibratory unit and o... | 07/25/2006 |
| 7048076 | Percussion electrical hand held tool An electrical hand-held tool includes an electric motor (2) having a rotor shaft (3) extending transverse to the tool percussion axis (A), a rotor sheet stack (4) supported on the rotor shaft, and a pinion (5) supported on the rotor shaft... | 05/23/2006 |
| 7032684 | Method of opening joints between drilling components, and rock drill A rock drill includes a string of components interconnected by screw threads and connected to a shank. A percussion piston is reciprocated against the shank during a drilling operation, while a support device applies axial support to the rear of the shank, to enhanc... | 04/25/2006 |
| 7032689 | Method and system for predicting performance of a drilling system of a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation includes generating a geology characteristic of the formation per unit depth according to a prescribed geology model, obtaining specificat... | 04/25/2006 |
| 7013985 | Pneumatically operated screw driver A compact and light-weight pneumatically operated screw driver providing high speed screw fastening with high operability. A rotary member rotationally driven by a pneumatic motor includes a main rotary member made from a plastic material and a sliding segment fixed... | 03/21/2006 |
| 6957707 | Method for controlling a drilling sequence, a rock drilling apparatus and a computer programme to form a drilling sequence A method and a computer program for controlling a drilling cycle in a rock drilling apparatus, and a rock drilling apparatus. In accordance with the invention, each drilling unit in the rock drilling apparatus is monitored during a drilling period, and a drilling se... | 10/25/2005 |
| 6942042 | Pneumatic motor-controlled valve of screwdriver A pneumatic motor-controlled valve of a screwdriver is installed between an air guide hole of a pneumatic motor and a main air valve gate in the screwdriver. A valve hole is formed on a guide seat and is communicated to an air guide hole of the motor. A plug is form... | 09/13/2005 |
| 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 |
| 6929074 | Elbow-type power hand tool An elbow-type power hand tool including a housing, a motor, a planet gear set, a transmission shaft, and a torque controller mounted in the housing for controlling output torque of the transmission shaft. The power hand tool including a battery pack mounted in the h... | 08/16/2005 |
| 6843327 | Manual machine tool The invention is based on a hand power tool, in particular a drill hammer and/or a chipping hammer, having a striking mechanism (14) capable of being driven in a housing (10) by an electric motor (12), via which an insertable tool (18) si... | 01/18/2005 |
| 6814155 | Bolting rigs The invention provides a bolting installation apparatus comprising a base having a pair of parallel cylindrical rods held between two end plates; an intermediate carriage slidably mounted on said rods; a drilling unit carriage having at least one first rod and at le... | 11/09/2004 |
| 6799643 | Percussion electrical hand-held tool The present invention relates to a percussion electrical hand-held tool having an electronic control unit (5) for controlling at least one power parameter of the electrical tool, and a substantially flat force sensor for controlling operation of the electroni... | 10/05/2004 |
| 6796388 | Drill depth control device This invention provides a roof bolt installation apparatus including a drill stabilizing mechanism including a base having a cylindrical bore therein, and a stabilizing rod extendable from the base and slidably located in the bore. The rod has a distal end, and a dr... | 09/28/2004 |
| 6725946 | Excavation apparatus An excavation apparatus especially useful when mounted on backhoes and other lighter vehicles used in the construction industry. The excavation apparatus does not require a winch for letting out and retracting its cable nor a reel for storing retracted cable which r... | 04/27/2004 |
| 6687567 | Power tools Power tool (1) may include a drive source (22). A device for generating an elevated torque, such as a hammer (4) and anvil (2), may be operably coupled to the drive source. Further, a trigger switch (48) may energize the drive source. Preferably, a sensor... | 02/03/2004 |
| 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 |
| 6681869 | Hand held rotary-percussion tool with an electronic depth stop A hand-held rotary-percussion power tool includes an electrical drive (2) for generating a torque transmittable to a boring tool used with the power tool for forming blind bores, a hammer mechanism (3) for applying impacts to the boring tool, control devi... | 01/27/2004 |
| 6680595 | Control method and apparatus of screw fastening apparatus It is an object of the present invention to overcome various drawbacks of a conventional oil pulse wrench by using an electric motor, to reduce a reaction force and to fasten a screw with high precision. To achieve the object, the invention provides a con... | 01/20/2004 |
| 6672404 | Screw fastening machine Two guide members cooperatively constitute a chuck portion for holding a screw head. Opening and closing of the chuck portion is regulated depending on a mutual position between a machine body and a member into which a screw is driven. Guide pin portions ... | 01/06/2004 |
| 6607041 | Power tools Power tools are taught that may include, for example, means for detecting impact sounds generated, e.g. by a hammer strikes an anvil or by oil pulse from an oil unit. The detecting means may include a receiver (30) adapted to selectively convert sound wit... | 08/19/2003 |
