Abstract: The present invention is a double-headed hammer slidingly encompassing a ground rod driving shaft having a single anvil affixed thereto which can be selectively engaged by either hammer. The driving shaft has a recess in each end to receive the grounding rod, depending upon whether the action is to initiate and continue the insertion of grounding rod into the ground or to complete the insertion of the rod in accordance with the provisions of the Code. The present invention does not require the operator to take a position above the ground or to use any other instrument to make the complete and proper insertion of the grounding rod into the ground.

Abstract: An anvil is formed on one end of an elongated piece and the piece is driven into the ground or the like by impacting the anvil with a reciprocable ram driven by a drive mechanism that is operated by a valve which is reciprocably mounted in a normally balanced two directional fluid pressure circuit to reciprocate in the alternate directions thereof when the circuit is unbalanced in the respective directions thereof. The circuit has a pair of outlets therein which are connected with the opposing ends of the valve and disposed to slidably engage with the ram during the stroke thereof. The ram comprises an anvil impacting body having a striking surface on one end thereof and a pair of grooves in one laterally oriented face thereof which are mutually offset longitudinally the the reciprocable axis of the body on spaced parallel lines to form collateral mutually longitudinally offset lands on the lines.

Abstract: A reversible boring ram having a tubular body containing a reciprocable hammer is provided with a pneumatically balanced control member which allows the direction of operation of the ram to be reversed without halting the hammer's reciprocation. The pneumatically balanced control member also allows easy starting of the device.The control member includes a balance piston situated in a balance cylinder which is attached to the body of the ram, the balance cylinder being connected to an inlet channel in such a manner that forward pressure on the balance piston counteracts the backward pressure in the main cylinder. The control member may be spring biased into the position for forward motion.

Abstract: A diesel hammer (20) is adapted to produce uplift blows by connecting its casing (30) via a pulling connection (52) to a case (24) to be pulled, removing vent plugs (76) from the top of the casing, sealing all other openings (78), (82), (94), in the casing, applying compressed air from an external source (106) under the hammer ram (32) to drive it upwardly and thereafter allowing controlled flow of air out of the casing via a bleed line (118) and an adjustable orifice (238) to cushion the subsequent fall of the ram.

Abstract: A two-directional percussion implement selectively adaptable both for driving in and for extracting, e.g. piles, from the ground, includes two coaxial electromagnetic coils whose movable armatures are represented by extremities of a reciprocable ram. Opposite anvils, one of which is adapted to be coupled with a driven element, are interlinked by a non-magnetic shaft traversing the ram. When the implement is intended for drilling operations, a rotary drive imparts rotation to one of the anvils via a connection permitting independent rotation and reciprocation. The shaft in this case has a central channel for taking samples or for conducting drilling fluids. When adapted only for axial percussions, the implement is vertically suspended on a cable via a shock absorber.

Abstract: An attachment (15) for a percussive rock drilling machine (12) for withdrawing a drill steel from a drilled hole. The drilling machine is of the kind which is displaceable along a feed beam (14) by a feeding motor. The attachment (15) comprises a spring housing (17) which contains a compressive spring (22) and a stopping member (23), the housing being suspended by flexible means (26, 27) from a yoke-shaped member (18) coupled on to the drilling machine body (19). The stopping member (23) is arranged to abut against a coupling sleeve (32) or the like on the drill steel (16). When retracting the drilling machine (12) by the feeding motorand starting the ordinary percussive action, the impacts directed downwards will be transformed to impacts directed upwards which loosen and withdraw the stuck drill steel (16) from the drilled hole.

Abstract: A specific feature of the apparatus according to the invention which incorates a percussion unit to a tail piece whereof there is attached a rope connecting to a means of extracting is that fitted into said tail piece coaxially therewith and with a clearance is a ring, the clearance between said ring and said tail piece containing a resilient member with passages reeved wherethrough are the ends of the rope and the inside surface of said tail piece being provided with stops in the body whereof there are also passages for reeving the ends of the rope.

Abstract: This hydraulic hammering apparatus is so constructed that an upwardly opened fluid chamber is accommodated in a vertically movable manner within a longitudinal cylinder having a weight holding portion formed on the upper part of its top plate; the back of the top plate of the cylinder is sealingly connected with the opening of the fluid chamber by means of a diaphragm; water jet heads are provided oppositely to each other at the back of the top plate of the cylinder and the surface of the bottom plate of the fluid chamber respectively, said water jet heads being arranged to approach or space from each other in accordance with the vertical motion of the fluid chamber; and a hammering element is located between these water jet heads such that the upper and lower end parts of said element are sealingly fitted on or detached from the respective water jet heads.

Abstract: The device hereof comprises a manually mobile firewood log splitter adapted in the preferred embodiment version to be operable by a single individual upon relocatable movement thereof as needed from one use location to another, which device incorporates as features thereof a wheeled positioning and aligning support frame structure to enable an accurate adjustable placement of the cutting edge of any one of various interchangeable splitting blades at a selected position upon a particular firewood log section to be split, whereupon the operating individual step-mounts a pivotally deflectable spring biased elevating step integral to the support frame structure thus causing downwardly depending leg stancions thereof to engage the ground surface under operator weight and thus frictionally immobilize movement of the log splitting device to thereby effect retention of the set positioning fix of the selected splitting blade cutting edge upon a log section end for commencement of splitting operations, being thereafter

Abstract: Wood splitting tool comprises head with handle secured thereto. Head includes wedge having wood engaging portion and opposite top surface portion. Pin is secured to wedge and extends outwardly from top surface portion thereof, and impact weight is slidably mounted on pin. Enlargement at free end of pin prevents removal of impact weight so that upon swinging tool weight slides along pin and strikes top surface portion of wedge to provide second hit immediately after edge portion of wedge engages wood being split.

Abstract: A log splitting assembly comprising a pipe having a wedge at the bottom, a driving sleeve which telescopes around the pipe, and a plurality of weights positioned at the top of the driving sleeve around a post. The weights can be selected and interchanged so as to provide a total weight which accommodates the ability of the user to lift the sleeve and weights and subsequently drop the same with force. The log can thus be split in the most efficient manner.

Abstract: A reciprocating ram or hammer is disclosed for driving flat nails in mines without danger of creating sparks that might ignite inflammable gases that would cause an explosion. The hammer comprises a cylindrical tube in which a ram is reciprocated to strike an anvil or drive pin which pushes against a flat nail by overcoming the resistance of a helical spring in the tube. As the nail is being driven, it is held at the end of the hammer by a permanent magnet. Such flat nails are commonly driven overhead for suspending lines.

Abstract: An apparatus for extracting subterranean gas samples including an elongated stiff rod having a gas passageway from near the bottom end to near the top end, a means for driving the rod into the earth whereby the lower end is positioned below the earth's surface, a means to selectably open and close the gas passageway so that the passageway may be closed until the rod lower end is driven beneath the earth's surface after which the passageway may be opened, and means adjacent the upper end of the rod for extracting a gas sample from the passageway.

Abstract: A log splitter device is disclosed using a slide hammer type configuration for the driving of a wedge. The wedge itself defines an abutment surface which includes a shaft member extending outward therefrom. An annular member of generally tubular configuration is configured with the central bore into which extends the shaft member. A weight means is fixedly secured with respect to the annular member to provide added momentum. Two impacting areas are defined by this device such that each impact occurs simultaneously to increase the efficiency of momentum transfer from the weighted annular member to the wedge. An upper impact is achieved by a core member which is fixedly secured within the annular member contacting the upper edge of the shaft member extending through the central bore thereof. A second impact is created by the lower end of the tubular member in direct contact with the abutment surface of the wedge.

Abstract: A self-driven pneumatically operated ram borer for boring holes in the ground includes a casing containing a percussion piston and a control sleeve for controlling the supply of compressed air through a hose to cause the piston to reciprocate, is provided with a control tube which is rotatable to vary the porting of the borer to cause it to move either forwards or rearwards. The tube is rotated into either a forward position or a reverse position by means of a flexible shaft which extends from the casing within the hose. By enclosing the shaft within the hose, the shaft is protected and is not subject to friction against the wall of the hole bored by the borer or to jamming if the hole collapses. The borer can thus easily be controlled even when it has passed through a very long bore hole.

Abstract: Control device for the forward movement and rearward movement of self-driven pneumatic ram boring devices with an impact piston which is axially displaceable between two abutments in a tubular housing, with the axial forward movement and rearward movement of the ram boring device being controllable by rigid control edges of an adjustable control sleeve, the latter being supported on a bearing ring arranged in the rear part of the housing. Through the bearing ring there is led a part of the control sleeve forming a feed tube for the compressed air for connection to a compressed air hose, the sleeve having a piston-like control head containing the control edges; the control head engaging in a cylindrical recess at the rear end of the impact piston cooperates with radial control bores which are formed in the area of the recess in the impact piston. The control sleeve is mounted non-displaceably in the axial direction however rotatably in the bearing ring and is provided with at least four control edges.

Abstract: A log splitter comprising in combination a support, a wedge mounted to the support for vertical movement relative thereto, a hammer bar supported in vertical alignment with the wedge for reciprocal movement relative thereto on the one hand to be raised away from the wedge and on the other hand to be impelled into engagement with the wedge and handle bars at the upper end of the hammer bar for lifting the hammer bar away from the wedge and impelling it into engagement with the wedge.

Abstract: A peg and stake driver and extractor comprising a first elongate tubular member having a pair of wall projections secured thereto and a reciprocating tubular member positioned concentrically around the first member between these wall projections and having its own pair of opposing striking surfaces to forcibly contact these wall projections. The lower end of this first member includes a first longitudinal slot in the wall thereof joined to a second longitudinal slot of substantially greater width and defining opposing horizontal contact surfaces in the wall thereof. This slotted end of the first member is interlockable with the upper end of a V-shaped angle iron stake member having portions of its walls cut away to provide for the interlocking connection.

Abstract: A self-propelled pneumatic ram boring device for boring holes in the ground comprises a percussion piston which is reciprocable in a housing, and a control sleeve which controls the forward and rearward movement of the piston by passing over radial control ports in the piston. In order to control the device to move either forwards or rearwards, without having to twist a hose which supplies air to the device as is usual, the control sleeve is rigidly fixed in position in the housing and has control ports to which air is supplied or not under the control of valve members and which are themselves remotely controlled by a second compressed air supply to the device, or electrically.

Abstract: A self-propelled pneumatically operated percussion boring apparatus for boring holes in the ground of the kind which includes a percussion piston which is reciprocated pneumatically in a tubular housing is provided with a control device for causing the apparatus to make either a forward movement or a return movement. The control device comprises a control sleeve which has air ports through its wall and over which a skirt of the piston passes as, in operation, the piston reciprocates. The skirt has ports which come into register with ports in the sleeve and the sleeve is fixed in position in the housing and has a control tube rotatably mounted within it. The control tube has one or more ports through its wall and compressd air for operating the apparatus is supplied through the control tube.

Abstract: 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 the mode of operation alternatively under control of a valve that turns air pressure on and off in a supply or feed line to the device. When the air is turned off from the device the valve establishes connection to an aspirator for establishing a suction condition to the device that will reverse the mode so that upon turning on of air back to the device will make it operate in the changed-over mode.

Abstract: Sample gathering apparatus for drivably moving a core sampling assembly into and out of subterranean zones for gathering core samples therewithin, with the apparatus including an elongated frame means which is adapted for adjustable pivotal mounting upon a supporting vehicle. Drive means are provided for delivering power to the core sampling assembly, and coupling means are further provided for releasably securing the drive means to the core sampling assembly. The core sampling assembly is arranged to be driven vertically into the subterranean zones to be sampled, and the coupling means which releasably secures the drive means to the core sampling assembly permits pivotal motion of the core sampling assembly about a generally horizontal axis so as to permit pivotal lifting of the core sampling assembly from the ground surface for easy removal of the sample retained therewithin.

Abstract: A reversible ground perforating device powered by a gaseous medium under ssure, comprising a hollow cylindrical body with a pointed front end. The body accommodates a hammer adapted to reciprocate therein. A front power chamber of variable volume is formed by the hammer in the body. The rear end of the hammer has a cylindrical hollow which forms a rear power chamber of variable volume. The power chambers are interconnected by means of ports provided in the hammer. A stepped cylindrical barrel is located inside the cylindrical hollow in the hammer and coaxially therewith. The barrel is secured in the rear end of the body and the large-diameter portion of the barrel is arranged to interact with the hammer. The wall of the large-diameter portion of the barrel has ports. A spring-loaded stepped sleeve is mounted coaxially with the stepped barrel so that the large-diameter portion of the sleeve is adapted to cover the ports in the barrel.

Abstract: A pneumatic impact mechanism for driving rod-like members having a hollow cylindrical casing with a tail portion and a front end portion. The casing accommodates a reciprocating stepped hammer piston defining in the casing, on the tail portion side, a variable volume rear end work chamber in permanent communication with a source of compressed air. The stepped hammer piston defines, on the side of the front end portion, a variable volume front end work chamber.The stepped hammer piston has a through-passing axial bore, and its small-diameter portion cooperates with the tail portion of the casing and has radial passages. There is provided a tubular guide member or element for receiving the rod-like member arranged coaxially with the stepped hammer piston and casing and secured to the tail portion and to the front end portion of the casing in such a manner as to cooperate with the stepped hammer piston and define therewith, with the outer periphery thereof an axial passage.

Abstract: 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 a tensile strain or a compressive strain to the elastic part via the reaction material in order to accumulate the strain energy in the elastic part.For carrying out the driving operation, the strain energy is abruptly released from the top of the elastic part, otherwise the compressive strain is abruptly released from the bottom of the elastic part. The strain energy is transformed into a kinetic energy and the article is struck on its head by this kinetic energy so that a compressive strain wave is generated in the article being driven.For carrying out the extracting operation, the compressive strain is abruptly released from the top of the elastic part, otherwise the tensile strain is abruptly released from the bottom of the elastic part.

Abstract: The device comprises a hollow cylindrical body, pointed front at its end which device accommodates a striker forming the front working chamber in said body, and has a cylindrical space at its rear end. Said space receives an air-distributing and reversing mechanism, thus forming the rear working chamber. The air-distributing and reversing mechanism has a bushing which is fixed relative to the body, and an axially movable bushing, both bushings being arranged coaxially, spring-loaded in the axial direction relative to each other, and forming a chamber located in the front part of said mechanism, with the chamber communicating with a source of compressed air and intended to move the movable bushing during reversal of the device.

Abstract: The device has a hollow cylindrical housing pointed at the front end and accommodating a hammer piston, which defines with the housing a front end work chamber and, which has at a rear end portion a cylindrical space and an open-ended radial passage. The cylindrical space receives the large portion of a stepped pipe in order to define with the hammer piston a rear end work chamber. The small portion of the pipe is received in the rear end portion of the housing for rotation about its axis within limits defined by a locking member and is connected, by means of a flexible hose, to a source of compressed air for permanent supply to the rear end work chamber of compressed air. The large portion of the stepped pipe opens the radial passage of the hammer piston at regular intervals to establish communication between the front end work chamber and the rear end work chamber, thereby enabling forward movement of the device.

Abstract: The apparatus has a pointed-nose hollow cylindrical body with a closed rear portion. Disposed inside the body, so as to enable reciprocation and rotation about the axis of the body, is a stepped striker which can be locked against rotation about the axis of the body in two positions, the positions corresponding to forward and reverse movement of the apparatus.For the purpose of admitting compressed air into a forward working chamber, the striker is provided with a central passage permanently connected to a rear working chamber and at least two radial passages which provide communication between the central passage and an outer cylindrical surface of a large step of the striker. The radial passages are displaced relative to each other both circumferentially and longitudinally along the axis of the body.

Abstract: A method for breaking a hard compact material such as rock or concrete. The method includes drilling a hole into the material, gripping a portion of the wall of the hole by applying a radially outwardly directed force thereto, and applying an axially outwardly directed force to the gripped region in order to cause cracks to arise in the wall of the hole. One of the forces is generated by means of sequentially repeated axially directed impacts. The apparatus for carrying out the method comprises a gripping means and a wedge means slidable relative to the gripping means. The gripping means and the wedge means have cooperating wedge surfaces. A rear extension member having a shoulder is attached to the wedge means. A hammer piston reciprocable in the apparatus housing delivers sequentially repeated axially directed impacts upon the shoulder.

Abstract: A machine for driving and extracting piling and the like having a horizontal support member and frame coupled so that the frame may move toward and away from the support member in a vertical direction, a pair of races located side by side in the frame and defining a corresponding pair of paths of travel spaced horizontally from each other and located in a common vertical plane, a relatively heavily weighted roller mounted for rotation within each race, each roller being rotatable about a horizontal axis perpendicular to the common vertical plane, means for rotating the weighted rollers in synchronism such that the horizontal components of the forces generated on the frame by the rollers cancel one another and the vertical components of the forces are in phase to thereby simulate the impact of a conventional reciprocating pile hammer.

Abstract: The disclosure relates to an improved manual impact apparatus for driving a stake of the type having a head at one end thereof, which apparatus is characterized by a slidable sleeve having oppositely disposed and facing impact stops therein to confine the stake head therebetween during driving or pulling, whereby the stake may be longitudinally propelled in response to impact between one of the impact stops and the stake head.

Abstract: A power booster assembly for use to increase the power used in pulling or driving tool mechanism such as used in straightening an automobile frame and the like. A cylindrical body having closed ends and attachment means at each of the ends with a power piston mounted for reciprocation therein together with a spring biased hammerhead which is latchable on to one end of the power piston for fluid actuation of said piston to draw the hammerhead against the spring bias. Cam release structure within the body causes the hammer latch mechanism to be released and permits the hammerhead to trip and bang against one closed end of the cylinder with tremendous force. Repeated action of catching and releasing the hammerhead takes place according to the amount of fluid being permitted into the power cylinder. Valve mechanism is arranged to automatically cause proper reciprocation of the power piston according to the amount of fluid and the pressure thereof being fed to the assembly.

Abstract: The apparatus consists of a hollow body wherein there is contained a striker which divides the space inside the body into a forward operating chamber and a rear exit chamber. The striker is provided with ports for admitting compressed air into the forward operating chamber and for allowing the emission of spent air from the chamber. The striker is also provided with an interior space, the rear end face of said striker being left open. Said hollow body includes passages and a pipe for placing said interior space of said striker in communication with a source of compressed, the pipe being positioned for longitudinal travel relative to the body.

Abstract: A method and an apparatus for pulling flexible duct through soil simultaneously with the penetration of soil which comprises a means for penetrating the soil having a duct receiving portion mounted to its trailing end. The duct is pulled through the soil by a pulling means operably associated with the penetrating means which acts to pull the duct in the same direction and simultaneously with the movement of the penetrating means.

Abstract: A novel tool and method for extracting arrowheads from stumps, trees and the like using a linearly slideable housing or hammer mounted on a shaft which is attached to the arrowhead is described. In particular, the tool is provided with a retaining means to hold the shaft in the housing to prevent accidental movement and thus noise in use in the field. The tool preferably has a round shaft which is rotatable in an extended position in the housing which facilitates arrowhead extraction during linear movement and which in its retracted position in the housing engages a locking means which holds the shaft from rotational movement to permit threading of the shaft onto and off from the arrowhead by rotating the housing.

Abstract: A device has a cylindrical housing with a pointed front portion, which accommodates a striker separating the inner space of the housing to form a front and rear active chambers. The striker is provided with an open space at the rear end face thereof which mounts an air distributing branch connection threaded in the housing to be axially displaceable therein for reversing the device motion and adapted to admit compressed air to the active chambers and discharge it to the atmosphere therefrom thus reciprocating the striker which applies impacts to the housing. The air distributing branch connection has pipes arranged coaxially and forming longitudinal passages, of which the central passage serves to admit compressed air to the active chambers, while the annular passage between the pipes is used to discharge spent air from the active chambers.

Abstract: A percussive device comprising a housing with a pointed front end and a hammer piston accommodated in the housing to form a front working chamber therewith. The hammer piston is provided, in the rear portion thereof, with a cavity in permanent communication with a source of compressed air, the cavity serving as a rear working chamber. An airdistribution mechanism includes a tube mounted in the housing within the hammer piston cavity so that it is conjugated with the walls of the cavity, the piston having air passages therein positioned in such a manner that, during the reciprocation, the tube alternately communicates the front working chamber, via these passages, with either the rear working chamber or ambient atmosphere.

Abstract: The device features its housing carrying the soil sampling ing socket and the striker arranged coaxially to said socket, and adapted to act thereupon and establish some chambers in said housing, which are alternatively communicated, through the inlet fitting and the piping connected thereto, with a source of compressed air for the striker to perform forward and return strokes. The piping portion immersed in water is essentially a rigid pipe joined with the inlet fitting by way of an axially spring-loaded sleeve whose one end is rigidly connected to said pipe. Arranged along said pipe is another pipe rigidly coupled thereto and serving for used-up gas to discharge from said chambers to the water surface.Such a device is applicable for soil sampling at depths amounting to several scores of meters.