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7588096 |
Cordless fastener tool with fastener driving and rotating functions
A fastener-driving tool includes a combustion power source configured for driving a driver blade linearly towards a workpiece, and an electrical power source associated with the combustion power...
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7414241 |
Laser device
A laser device includes a virtual source configured to aim laser energy that originates from a true source. The virtual source has a vertical rotational axis during vertical motion of the virtual...
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7308949 |
Concrete drill
A concrete drill for drilling concrete or the like by a diamond bit ( 5 ) attached to a front end of a bit drive shaft ( 4 ) projected forward from a main body ( 1 ) by driving to rotate the bit...
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6843329 |
Rotary percussion device for a drill column
The inventive rotary percussion device (1) used for driving at least one drill column (2) disposes of a percussion device (6) and a rotary device (5) and of an insertion end (3), which is rotatably...
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6708778 |
Hydraulic unit with increased torque
A hydraulic unit includes a case, a liner contained in the case, and a top cap and an opposing bottom cap plugged at the front and rear ends of the case. The unit further includes a spindle...
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6705407 |
Rock drilling and mounting frame
A rock drill includes a mounting frame to which a hammering apparatus and a rotating apparatus is arranged. The mounting frame is made maneuverable with respect to a feeding beam by means of slide...
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6273199 |
Arrangement in rock drill and method of controlling rock drilling
An arrangement in a rock drill comprising a shank and a percussion piston and lifting sleeve for moving the shank towards percussion piston, and a method of controlling rock drilling. The...
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6202763 |
"Twin-impact" double-blow drilling apparatus
A drilling apparatus 1 having a twin-impact system can work continuously with a shank end 5 is provided with a compensation ring 10 on the rotary impact side, which has a material with hardness...
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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...
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5896937 |
Buffer mechanism of hydraulic impact apparatus
The present invention relates to a buffer mechanism of a hydraulic impact apparatus of a rock drill, and the like, and the buffer mechanism reduces damage by buffering the reflected energy from a...
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5730230 |
Rotary percussion drill
A rotary percussion drill for mining, rock drilling and similar operations is provided. The drill combines a rotation portion with a percussion portion to impart a simultaneous rotational and...
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5667022 |
Hydraulic impact device with continuously controllable impact rate and impact force
An impact device 1 that is continuously controllable in terms of impact rate and impact force contains a percussion piston 25 that can move back and forth in the inner boring of the cylinder 3, and...
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5458205 |
Liquid driven hammer machine
Liquid driven hammer machine with a machine housing (1) and a hammer piston (2) moveable to-and-fro in guides (4,5) in the machine housing. The guides are made with an intermediate section (6) and...
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5415240 |
Drilling device for a rock drill
The invention concerns a rock drill (2) for activating a rotatable and reciprocable drill steel assembly (FIG. 1 ). A reversible motor (50) is coupled to a striking bar (3) for rotating the drill...
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5351763 |
Arrangement for an axial bearing in a drilling machine
The invention relates to an arrangement for an axial bearing in a drilling machine. The drilling machine includes a frame (6), a percussion device (1) fitted in the frame, and a shank (2)...
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5289887 |
Method of operating an earth boring machine
In a method of operating a ram boring machine having a rotatory-thrust drill rod an impact force is applied to the rear end of the drill rod. The boring machine includes a thrust unit and a...
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5207280 |
Device in hammer machines
Device in hammer machines. The device comprises a machine housing (1) and a hammer piston (2) movable to-and-fro in the machine housing. A drilling tool connected to the machine housing comprises a...
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5161624 |
Tool for driving fastening elements into hard receiving materials
Tool for driving fastening elements into a hard receiving material, such as concrete, masonry, rock and the like, has a first device (1) for drilling a fastening element into the hard material and...
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5117921 |
Hydraulically operated hammer drill
A hydraulically operated hammer drill includes a housing in which a striking piston is displaceably disposed for alternating movement. The striking piston is driven in striking and return...
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5092411 |
Drilling apparatus
A drilling apparatus, especially for drilling blast holes, includes a carriage, a drilling rod, a pressure-operated drive system movable along the carriage for transmitting a back and forth...
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5010963 |
Hydraulic drilling machine
A hydraulic drilling machine comprises a drill tool (1) connected to a hydraulic motor (3), a hydraulic percussive mechanism (4) connected via a hydraulic distributor (15) to a hydraulic pressure...
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4993504 |
Device for efficient energy transfer and damping of impact drilling machines
Device in impact machines. The device comprises a first chamber (5) which is connected to an accumlator (6) and the pressure of which is used to hold together a set of rods (2) forming part of the...
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4858701 |
Fluid-powered impact device and tool therefor
A percussion tool usable as part of a single tool impact device or a multi-tool impact device. In each case, the tool is rotatably driven by a high-torque rotary actuator with the tool being...
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4854394 |
Arrangement for supporting of a shank of a drilling machine
An arrangement for mounting and supporting of a shank of a drilling machine comprising a body supported by a carriage, a percussion piston mounted in the body, and supporting housing positioned at...
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4846289 |
Arrangement for supporting of an axial bearing of a drilling machine
An arrangement for supporting of an axial bearing of a drilling machine which comprises a body (1) supported by a carriage (15) and a rotation bushing (5) mounting rotatably in the body for...
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4846288 |
Hydraulically powered rotary percussive machines
A single supply line feeds hydraulic fluid under pressure to a hydraulic percussive machine with a percussion motor and a rotation motor. A constant flow device is positioned between the supply...
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4842080 |
Arrangement for mounting of a rotation element in a drilling machine
An arrangement for mounting of a rotation element in a drilling machine comprising a body (1) and a rotation element (8) mounted by means of bearing surfaces (8a, 8b) rotatably in the body for...
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4842079 |
Body construction for a drilling machine
A body construction for a drilling machine comprising a body provided with end covers, a percussion means mounted in the body, and a rotation means positioned on an axial extension of the...
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4732218 |
Hammer drill with separate and interconnectable drive means
A hammer drill includes a unit for supplying impact force to a tool inserted into the hammer drill and a unit for supplying rotational forces to the tool. A first drive motor drives the impact...
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4593768 |
Hydraulically operated impact device
In a hydraulic rock drill there is a hydraulic so called recoil damper that damps the reflected shock waves that propagates from the rock backwardly through the drill stem. The damper comprises a...
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4576240 |
Hydraulic impact device
A hydraulically powered impact device for rock drilling having an impact piston driven by a hydraulic drive unit and a shank rod adapted to be struck by the impact piston. A motor imparts a rotary...
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4494613 |
Method and apparatus for driving hollow piles into the ground
A method and apparatus for driving a hollow pile into the ground. By using a hollow rod having a short auger fixedly secured to a leading end portion thereof, excavated earth and sand are lifted to...
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4462467 |
Percussion drill machine
A percussion drill machine includes a drill shaft with a chuck for a drilling tool and a percussion device for imparting percussive force to the drilling tool held in the chuck. Each of the driving...
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4430926 |
Hydraulic rotary-percussive machines
A single hydraulic supply line feeds fluid under pressure to a hydraulic percussive machine with a percussion motor and a rotation motor. The feed passes through two valves of the constant volume...
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4429752 |
Pneumatic motor for rock drills and the like
A pneumatic motor for rock drills and the like having a reciprocating piston with valves at its opposite ends for valving motive air to the piston head from both ends of the cylinder. Large...
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4399876 |
Reversing mechanism for the direction of rotation in a drilling apparatus
A mechanism for reversing the direction of rotation in a drilling apparatus comprising a feeding beam (1) and a drilling machine (3) supported by the beam for longitudinal movement back and forth...
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4366868 |
Rock drill apparatus
A striking apparatus that includes a reciprocating striking piston operable by a pressure mechanism, a cylindrical body, the improvement comprising a sleeve bushing mounted inside of the...
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4365675 |
Pile driving assembly
A pile driver assembly comprising a lead, a hammer supported for longitudinal movement along the lead, a helmet at the lower end of the lead configured to receive the end of a noncircular pile, a...
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4341271 |
Rock drilling method
A rock drilling method according to which the drill is subjected to successive axial strikes and is rotated around its longitudinal axis. The direction of rotation is repeatedly reversed after the...
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4206820 |
Striking bar
This invention relates to improvements in working member assemblies and is described hereinbelow with particular reference to a novel striking bar assembly for use in open front type rock drills.
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4182421 |
Pneumatic rock drill
A rock drill in which there is provided an impact unit, a front head with a tool holder and rotary drive means defined by a conventional pneumatic motor having a stator in the form of a cylindrical...
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4166507 |
Percussive drilling apparatus
A hydraulic rotary percussive drill which is adapted to operate as a drill for installing rock bolts in mines is described. The drill is configured so that the shank (which holds the drill steel...
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4161990 |
Rock drilling apparatus
A rock drill is mounted on a cradle that is axially displaceably mounted on a feed beam. The drill has a front aperture for receiving the rear end of a drill string. The drill string is freely...
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4161989 |
Reciprocating hydraulic motors
A reciprocating hydraulic motor, for example for a rotary percussive drilling head, includes a piston and cylinder having a piston face exposed to the pressure in a compression chamber which is...
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4157121 |
Hydraulic powered rock drill
A rock drill having a hydraulic pressure reservoir formed by the drill housing, and an anvil rotation mechanism enclosed in the housing. A piston of substantial length and a mechanical...
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4134460 |
Hydraulic drilling device
This drilling device includes a hydraulic motor, coaxially surrounding the drill rod, for rotating the drill. The rotor of the motor directly rotates the drill, without the use of gears....
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4094365 |
Electrohydraulically operated portable power tool
A portable power tool wherein the housing contains a pump, a tank for a supply of oil for the pump, an electric motor for the pump and one or more hydraulic motors which receive pressurized oil...
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4071093 |
Air percussion boring machine
An air percussion boring machine comprising a percussion means, a front head with a boring tool holder, a rear head with a hole mouth washer and a boring tool rotation mechanism synchronized with...
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4039033 |
Hydraulic rock drill
An hydraulically operated striking apparatus for driving a rock drill comprises a body having an axial, cylindrical, interior space with an inwardly protruding annular member. A cylindrical piston...
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4006783 |
Hydraulic operated rock drilling apparatus
A rock drilling apparatus comprises a hydraulically rotated drill, a percussion motor having a piston which transfers impact energy to the drill, the piston defining together with the machine...
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