Matches 201 - 250 out of 293 < 1 2 3 4 5 6 >
Match Document Document Title
4413396 Microprocessor control yield point tightening system  
A method for tightening a fastener to yield point wherein areas under a torque-angle curve--each of said areas including a constant abscissa--are successively measured. A decrease of area in a...
4377355 Quiet bouncer driver thruster method with pressurized air chamber encircling massive bouncing piston  
A massive piston, which might be called a "ram", except that it does not strike anything during operation, reciprocates with bouncing action up and down within a cylinder. An annular pressurized...
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...
4323127 Electrically operated impact tool  
One or both of a pair of oppositely rotating bodies, such as motor driven flywheels, are mounted for pivotal movement against the side of a ram. One or more tension rods connect pivot shafts or...
4311416 Pre-load jack system and method of driving element into the ground  
A pile driving rig is used to pre-drill a hole into which an elongate element, such as a pile or a hollow mandrel is inserted. A large portion of the weight of the rig is imposed upon the elongate...
4273198 Motor-driven clamping method and device  
A motor-driven clamping method characterized by a two-step control operation, in which when a torque applied to a member to be clamped reaches a first set value smaller than a reference set value,...
4260029 Midpoint centralizer  
A method and apparatus for maintaining alignment of the drill steel or drill rod of a drilling machine in which a midpoint centralizer or indicator ring having an aperture therethrough...
4244245 Fastener tension control system  
A method and apparatus for controlling final tension on a fastener being run up and set. An efficiency factor is developed and utilized for attaining predetermined final tension on a fastener, or a...
4240511 Drilling machine centering arrangement  
A centering arrangement for a drilling machine or the like mounted on a boom or jib on a truck or the like for drilling rock, for example, and in which, for centering the drilling machine, the...
4214638 Method of controlling the reversing of a device for driving holes in earth and device for performing same  
A percussive device operable in a forward mode for making a hole in soil and operable in a reverse mode to retract the device from the hole. The device is provided with control means that change...
4205362 Apparatus for moving along or through a material  
A two-part pile or probe device in which the parts can be moved relative to one another by a jacking mechanism. In operation, one of the two parts is made anodic to grip the material in which the...
4204622 Electric impact tool  
This invention relates to an electric impact tool characterized by a pair of electric motor-driven counterrotating flywheels, at least one of which is movable relative to the other from a retracted...
4201269 Impact device with linear single acting air spring  
An impact device incorporating an improved air spring coupler in the form of a novel cylinder-piston is disclosed, in which the air spring is linear, i.e., the air spring stiffness is substantially...
4161221 Method and apparatus for pretensioning screw joints  
A method and apparatus for tightening a screw joint to a predetermined axial load F p providing the spring constant k=(F/φ) of the joint is known, wherein the torque/rotation relationship M (φ)...
4159039 Method and an apparatus of driving an article and extracting by strain energy  
The invention is to drive an article into an object or extract it therefrom by means of strain energy. The article is provided at its top with an elastic part having a reaction material for giving...
4143719 Multi-vibro pile hammer  
A multi-vibro pile hammer comprising a plurality of vibro pile hammers having vibration generating units adapted to generate vibrations with different phases and in synchronism with one another,...
4132276 Arrangement for forming vertical or steeply inclined shafts  
A stopping apparatus is suspended in a pilot shaft and blasting charge holes are drilled outwardly and downwardly from successive vertical positions from the bottom to the top of the pilot shaft to...
4131164 Adaptive valve control system for an impact device  
Switch means on the frame of a forging device senses when the ram and piston enter a first zone of a pneumatic cushion during retraction to initiate timing. If a predetermined time has expired...
4126191 Gas discharge type underwater hammer with liquid purge and reflood control  
An underwater hammer, of the gas discharge type, is provided with a surrounding casing arranged in the nature of a diving bell from which liquid can be purged so that the hammer ram may move up and...
4114698 Method and apparatus for tunneling upwardly  
A vertical thrust boring machine adapted to be positioned in the horizontal drift of a mine and to cut a tunnel extending upwardly from the drift so as to remove ore or other cuttings therefrom....
4113033 Method and arrangement for positioning a working tool to a predetermined direction and/or a predetermined point  
A working implement such as a rock drilling apparatus is automatically positioned to predetermined positions and/or directions. Particularly, a drill bit is moved to an imaginary plane spaced from...
4106569 Apparatus for applying an impact force  
A pile driver in which a weight is reciprocated in a frame along a vertical path. The weight is suddenly retarded just before the weight reaches its lowermost position and the resulting high force...
4089380 Hammer having fluid biased work member  
A hammer and more particularly a fluid operable hammer wherein alternating impetus provided by pressurized liquid and gas means actuates a reciprocable hammer piston to generate repetitive impact...
4081037 Control system for a multiple spindle machine  
This disclosure deals with a machine for simultaneously tightening a plurality of threaded fasteners. The machine includes a plurality of torque applying units, one for each fastener, which engage...
4078617 Portable drill rig for boring underground inverted arcuate paths  
A portable drill rig having an inclined ramp is transportable in discrete sections with each section of the inclined ramp forming a separate truckbed chassis. In erection the front portion of the...
4068727 Method and device for damping the recoil of a work tool connected to a rock drilling machine  
A recoil damping device for a percussive tool comprises a retard piston which is movable in a cushioning chamber. The feeding force and/or the pressure in the supply passage to the cushioning...
4063599 Method and apparatus for underwater pile driving  
Underwater pile driving is implemented by a pile-driving apparatus 14 releasably coupled to a guide sleeve 5 secured to the top of a pile 10. The assembly may be performed on the surface vessel 1...
4058175 Method for operating pile driver  
Method and apparatus for forming piles in the earth with a pile hammer rig having a hoisting drum carried by a crane, driving and braking apparatus for the drum, a drop-weight, a hoisting rope...
4045969 Submergible pile driving method and apparatus for continuous operation  
A submergible pile driving apparatus is suspended from a string of rigid tubes 12 to minimize twisting during operation, and the tubes also carry conduits 18, 19 for transmitting hydraulic,...
4040492 Modular leads frame with noise abatement system and pile feeder  
A modular leads frame for a pile driving machine is provided with a plurality of noise abating shield members which surround the driving hammer of the pile driving machine with certain ones thereof...
4030553 Percussion tool with noise reducing characteristics and method of making  
A method of modifying a percussion tool to provide noise reduction, and a percussion tool having effective noise damping characteristics. In the method of the present invention, a troublesome noise...
4016938 Method for fastener tensioning  
A fastener tensioning system for use with torque producing power tools, such as, nut runners or the like. The system includes apparatus to rotate the fastener and determine when the fastener has...
3998064 Subaqueous pile driving apparatus and method  
There is disclosed a system for subaqueous pile driving in which the pile and the hammer are completely submerged. The pile is suspended by at least one cable in such a manner that two cable...
3983946 Automatically repositionable rotary platform, and method  
A derrick-type augur drill machine mounted on a carrier, including a rotary platform having both a memory device and an automatic latching means associated with the memory device, the memory means...
3961671 Earth anchor drive process  
A medium duty earth anchor of the type having one or two single turn helixes near the lower end of a rod is driven into the earth by means of a hand-held drive tool having a vertical quarter...
3939920 Tightening method and system  
A tightening method and system for practicing same are disclosed herein for tightening a fastener to a desired axial load. According to the method, torque is applied to the fastener until it is...
3938595 Apparatus and method for driving bulb piles  
Method and apparatus for forming piles in the earth with a pile hammer rig having a crane, a hoisting drum carried by the crane, a driving mechanism for driving the drum through a clutch assembly,...
3933208 Centralizer control  
An automatic control system for an adjustable, power operated drill string centralizer.
3918530 Eccentric element for silencing tool and method  
A method and a means for silencing the noise generated by a vibrating impact transmitting tool such as a pneumatic hammer operated chisel, pick, spade or ballast tamper in which an elastomeric...
3905426 Earth boring machine positioning system  
The present invention provides a system for moving an earth boring machine from an initial position on a floor to a desired drilling position on the floor. A rotation pedestal is positioned beneath...
3872932 PROCESS AND APPARATUS FOR AUTOMATIC DRILLING  
The process comprises progressively increasing the weight on the drill bit, determining the greatest value of the penetration rate of the drill bit during this period, progressively decreasing the...
3867846 HIGH SLIP PRIME MOVER FOR PUMPJACK APPARATUS  
Pumpjack apparatus for reciprocatingly driving a plunger comprising a low slip electric motor connected to a gear reduction assembly by a torque converter, with the gear reducer cranking a walking...
3866425 METHOD OF AND APPARATUS FOR THE DRIVING AND EXTRACTOR OF SHEET PILES  
This invention relates to sheet piling and more particularly to a method and apparatus for use in the driving and extraction of sheet piling and the present invention seeks to provide an improved...
3847230 SYSTEM FOR DRIVING OBJECTS USING PRESSURE OR TRACTION FORCES  
An arrangement for driving objects, such as piles for example, into a receiving surface by pressure or traction forces is herein disclosed. The arrangement includes a piston-cylinder arrangement...
3846991 PILE DRIVING METHOD AND APPARATUS  
Driving of piles into submerged lands with a steadily applied force of sufficient magnitude to appreciably deflect the sub-soil, with or without superimposed driving pulses.
3842917 PUMPED EVACUATED TUBE WATER HAMMER PILE DRIVER  
Driving piles with a liquid ram or spear generated in a pumped, evacuated tube. Various configurations are shown, including those in which the pile itself defines at least a portion of the working...
3835939 WELL DRILLING  
A method and apparatus for physically restraining a drill string at various points above the earth's surface and below the apparatus for rotating the drill string to prevent substantial lateral...
3831386 DRIVING OF HOLLOW TUBULAR MEMBERS  
A hollow tubular member such as an open ended pile shell is driven by a sequence of explosions near its lower end. These explosions evacuate the lower end and loosen the earth beneath the member....
3828866 IMPULSE DRIVING APPARATUS  
An impulse driving apparatus, for use for example in pile driving, in which a plurality of striker members are released from a given height above an object to which impulses are to be given in such...
3824797 EVACUATED TUBE WATER HAMMER PILE DRIVING  
Driving long piles into submerged lands with a liquid ram or spear generated in an evacuated tube. Various drivers are enclosed. In one embodiment, the pile itself is used as at least a portion of...
Matches 201 - 250 out of 293 < 1 2 3 4 5 6 >