Abstract: A boom arrangement (7) for a rock drill rig (5) including a feed beam unit (8) for displaceable reception of at least one rock drilling machine (10, 10?), a support unit (13) for connection to and support of a rotator unit (12), a boom unit (11) between the rotator unit (12) and the feed beam unit (8) for displacement of the feed beam unit in planes essentially at right angle to a main plane (P) for the support unit (13), wherein the rotator unit (12) is arranged for rotating the feed beam unit (8) around an axis (A), which is essentially-perpendicular to said main plane (P), wherein the support unit (13) is connectable to a vehicle unit being part of the rock drill rig (5), and being arranged for displacing the rock drill rig. The support unit (13) has joint connecting elements (14) being sidewardly connectable for connection to a sidewardly directed carrier device (15, 17) which is attachable to the vehicle unit, and a lower abutment side (16) for lying supporting against an outer substrate.

Abstract: A remote controlled work robot including a remote controlled actuator and a support device therefor. The remote controlled actuator includes a spindle guide section of an elongated configuration, a distal end member fitted to a distal end of the spindle guide section through a distal end member coupling structure for alteration in attitude, and a drive unit housing connected with a base end of the spindle guide section. The distal end member rotatably supports a spindle for holding a tool. The support device includes a single degree-of-freedom system, in which the remote controlled actuator has a degree of freedom in one direction, or a multi-degrees-of-freedom system, in which the remote controlled actuator has a two or more degrees of freedom relative to a base on which the support device is installed. A drive source and is also provided for driving the degree-of-freedom system.

Abstract: A linear guide for the falling weight (1) of a pile hammer, having at least one bearing housing (4, 24) that can be arranged according to the present invention without lubricant in that the bearing housing (4, 24) has sliding elements (5, 25) preferably made of plastic and contacting the falling weight (1) in order to guide the weight, and the sliding elements can be installed and removed while the falling weight (1) is installed.

Abstract: A pile driver includes a leader rotation/holding mechanism that can firmly hold a leader in a rotatable state and also reliably rotate the leader using a general-purpose, inexpensive hydraulic motor by keeping the hydraulic motor from action of a bending moment from the leader. The pile driver has a leader revolver that includes a mechanism for rotating a leader. The leader revolver includes an outer tube and an inner tube that is concentrically arranged inside the outer tube via a pair of tapered roller bearings provided at two upper and lower positions. A lower part of the leader is connected, in an integrally rotatable state, to an upper part of the inner tube protruding upward from an upper end opening of the outer tube. A hydraulic motor is placed in a lower part of the leader revolver.

Abstract: An excavation apparatus includes a support structure mountable to a truck bed, the support structure defining a longitudinal direction extending front-to-back of the truck bed, and a lateral direction extending side-to-side of the truck bed. The apparatus further includes a rotary spindle pivotably supported by the support structure at a first pivot joint defining a generally horizontal first pivot axis, the spindle extending lengthwise along a spindle axis and rotatable thereabout for driving a cutting head; the spindle pivotable about the horizontal first pivot axis between a stowed position wherein the spindle axis is generally horizontal, and a deployed position wherein the spindle axis is generally vertical. The support structure includes a first adjustment device for adjusting the position of the spindle in the longitudinal direction when deployed, and a second adjustment device for adjusting the position of the spindle in the lateral direction when deployed.

Abstract: A power tool comprising a housing, an output shaft driven by an electric motor for driving a working piece and an adjustable handle. An elongate supporting wall of the housing extends slantwise downwardly from a rear end of the housing and houses the motor. The adjustable handle is adjustably supported by the elongate supporting wall in a secure and reliable manner whilst the whole power tool is compact.

Abstract: A pile driver including an apparatus for allowing relative movement between a hammer and a boom of an excavator. The apparatus includes a mounting plate mounted to the boom that interfits with and is slidable with respect to a frame rail mounted to the hammer. In operation, the hammer is placed on top of a pile and, as the pile is driven downwardly, the hammer follows the pile. Owing to the relative movement between the boom of the excavator and the hammer, the hammer follows the pile without requiring continuous downward readjustment of the boom. In one embodiment, the mounting plate assembly does not extend substantially above the hammer frame. In another embodiment, the hammer can rotate with respect to the boom. In one embodiment, the hammer includes a ram, a cylinder for lifting the ram, and rotation-resistant cable connecting the ram and the cylinder.

Abstract: A rock drilling machine (1) having, on a machine housing (2), a first attachment element on a first attachment side (13) for its fastening to a slide member which is movable back and forth along a feed beam, the attachment element having a contacting surface (17) for co-operation with a contacting element supported by the slide and a fastening element (18, 19) for the engagement with fasteners co-operating with the slide. The machine is distinguished by the rock drilling machine (1) being provided also with a second attachment element on a second attachment side (15), the second attachment element being configured similarly to the first attachment element, having a contacting surface (17) and fastening element (18, 19), to allow the rock drilling machine (1) to be fastened to the slide member also with the second attachment element. A rock drilling system has the rock drilling machine as one of its components.

Abstract: An apparatus and method for a modified horizontal directional drilling assembly for drilling pipe into a drilling surface. The drilling assembly comprises a power unit for supplying power to the assembly, a thrust frame adapted to be moved between a position substantially parallel to the drilling surface and a position substantially perpendicular to the drilling surface and a means for moving the thrust frame. The drilling assembly further comprises a rotary and carriage assembly mounted on the thrust frame. The rotary and carriage assembly is adapted to apply rotational, thrust and pull-back forces to the drill pipe. The drilling assembly is adapted to drill pipe into the drilling surface at any angle relative to the drilling surface between substantially parallel to the drilling surface and substantially perpendicular to the drilling surface.

Abstract: The present invention relates to a power tool comprising a housing, an output shaft driven by an electric motor for driving a working piece and an adjustable handle. An elongate supporting wall of the housing extends slantwise downwardly from a rear end of the housing and houses the motor. The adjustable handle is adjustably supported by the elongate supporting wall in a secure and reliable manner whilst the whole power tool is compact.

Abstract: A power tool (2) has a handle (6) and a tool body (4) pivotably coupled to the handle (6) by a pivot (76, 78, 102, 104). A motor (16), mechanically coupled to a rotary output (20), is housed in the tool body (4). A trigger switch (32) is housed in the handle (6). A locking mechanism is coupled with the handle and tool body. The locking mechanism enables or prevents pivotal movement of the tool body (4) relative to the handle (6). An electrical connection (36,38) between the handle (6) and the tool body (4) passes through the pivot (76,78,102,104).

Abstract: A method and a control system for controlling rock drilling. A control unit of a rock drilling apparatus is provided with one or more control modes, each determining the drilling variables to be measured, their threshold values and the operating principles according to which the operating parameters of drilling are controlled to achieve a desired control criterion.

Abstract: The drilling and bolting head (7) of compact structure, is designed for use in mine galleries of small height. It comprises: a transverse table (8) connected to the carrying vehicle, preferably with a device (9 to 12) for lifting this table (8); a slide (13) displaceable along the table (8); an intermediate support (16) displaceable vertically on the slide (13); a vertical beam (21) mounted pivotally on the intermediate support (16); a vertical slideway (23) guided vertically on the beam (21); a drill (26), with a device (33, 34) for the drilling and setting of bolts, which is guided vertically on the slideway (23); motorized device (14, 18, 30) for controlling the various movements. The intermediate support (16) possesses an upper part (20) which can be used as a prop, in combination with a jack (18) arranged along the vertical pivot axis (19) of the beam (21).

Abstract: A rotational float system (44) that is meant to be used with existing side load protection systems and that may be selectively operated to permit a digger derrick rotation motor (20) or other rotatable equipment to freely rotate toward a side load to ease operation of and prevent damage to the digger derrick (10) and to assist in the correct installation of screw anchors. The rotational float system (44) includes valve structure (46) interposed between the ports (32, 34) of a hydraulic rotation motor (20) and a control mechanism (48) for selectively opening and closing the valve structure (46). The valve structure (46) is normally biased to a closed position and the control mechanism (48) is normally open. When the control mechanism (48) is operated, it opens the valve structure (46) to connect the ports (32, 34) of the rotation motor (20) to one another.

Abstract: A power tool (2) has a first body (6), a second body (4) connected to the first body (6), and a locking mechanism. One of the bodies (4;6) is moveable with respect to the other body (4;6). The locking mechanism is capable of locking the movement of the one body (4;6) with respect to the other body (4;6). The locking mechanism is a two part system having a first part, a locking member (119), and a second part, receiving member (82). Engagement between the first part and the second part locks the first body (6) and the second body (4) against movement with respect to each other. One part is moveable with respect to the other part between a first position and a second position. The first part and the second part are engaged when the one part is in the first position. The first part and the second part are disengaged when the one part is in the second position.

Abstract: A post driving apparatus includes a chassis having a longitudinal axis and a frame carried by the chassis. The frame includes an upper support member having an axis of elongation substantially perpendicular to the longitudinal axis of the chassis. A post magazine is indexingly supported by the frame and, a post driving assembly is suspended from a portion of the upper support member for reversible travel therealong so as to laterally position the post driving assembly from the chassis. The post driving assembly includes a post driver adapted to retain a post supplied from the post magazine, the post driver adapted to continuously drive such post.

Abstract: A post driving implement for use with a vehicle, such as a tractor or a skid loader, is disclosed. The post driving implement is comprised of a hammer, a hammer channel, and a hammer cylinder. The hammer travels longitudinally within the hammer channel and is lifted by the hammer cylinder mounted to a closed end of the hammer channel. The hammer cylinder and its associated plumbing is of sufficient size to function as a hydraulic reservoir for the post driving implement, thus eliminating the need for a third hydraulic line to the reservoir on the vehicle and to avoiding need for alteration of the vehicle's reservoir. The post driving implement of the present invention may also include a back plate for mounting the implement to a vehicle. Additionally, the post driving implement may include adjustment mechanisms to vary the positional and angular relationship between the vehicle and the implement.

Abstract: A rotational float system (44) that is meant to be used with existing side load protection systems and that may be selectively operated to permit a digger derrick rotation motor (20) or other rotatable equipment to freely rotate toward a side load to ease operation of and prevent damage to the digger derrick (10) and to assist in the correct installation of screw anchors. The rotational float system (44) includes valve structure (46) interposed between the ports (32, 34) of a hydraulic rotation motor (20) and a control mechanism (48) for selectively opening and closing the valve structure (46). The valve structure (46) is normally biased to a closed position and the control mechanism (48) is normally open. When the control mechanism (48) is operated, it opens the valve structure (46) to connect the ports (32, 34) of the rotation motor (20) to one another.

Abstract: 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 least one second rod spaced apart from said first rod; a drilling unit slidably mounted on said second rod and said intermediate carriage slidably receiving said first rod of said drilling unit carriage; at least one moving means to move each of said base, said intermediate carriage and said drilling unit carriage relative to each other.

Abstract: A rock drilling rig has a carrier (1) provided with a service platform (7) arranged on a service boom (6). The service boom has a number of relatively movable boom sections (33, 36). The service platform (7) is connected to the service boom (6) by a parallelogram mechanism (22). The service platform (7) is arranged to the side of a swing plane of the parallelogram mechanism (22) to prevent collisions between the service platform and the service boom.

Abstract: A rock bolter has a turret assembly having a positionable base. The base slidably and rotatably engages a cylindrical member on which a feed track support is affixed. A jack rotatably and slidably engages the cylindrical member, but cannot translate with respect to the base. The jack has a piston connected to the feed track support, and extending or retracting the piston translates the cylindrical member relative to the base to move the feed track support toward and away from a rock surface. A stinger assembly connected to the base engages the rock surface to stabilize the turret assembly. A pivot actuator connected between the base and the jack rotates the jack and the feed track support to selectively place either a drill or a bolt driver in alignment with a desired location on the rock surface.

Abstract: A post driving apparatus includes a chassis having a longitudinal axis and a frame carried by the chassis. The frame includes an upper support member having an axis of elongation substantially perpendicular to the longitudinal axis of the chassis. A post magazine is indexingly supported by the frame and, a post driving assembly is suspended from a portion of the upper support member for reversible travel therealong so as to laterally position the post driving assembly from the chassis. The post driving assembly includes a post driver adapted to retain a post supplied from the post magazine, the post driver adapted to continuously drive such post.

Abstract: A system for driving a large diameter caisson into the ground, comprising a crane assembly, a plurality of vibratory devices, a clamp assembly, a suspension assembly, and a timing system. Each vibratory device generates a vibratory force. The clamp assembly rigidly secures each of the vibratory devices to one of a plurality of predetermined angularly spaced locations about the caisson. The suspension assembly connects the vibratory devices to the crane assembly such that transmission of vibratory forces from the vibratory devices to the crane assembly is inhibited. The timing system operatively connects the plurality of vibratory devices to synchronize the vibratory forces generated thereby.

Abstract: A post driving apparatus includes a chassis having a longitudinal axis and a frame carried by the chassis. The frame includes an upper support member having an axis of elongation substantially perpendicular to the longitudinal axis of the chassis. A post magazine is indexingly supported by the frame and, a post driving assembly is suspended from a portion of the upper support member for reversible travel therealong so as to laterally position the post driving assembly from the chassis. The post driving assembly includes a post driver adapted to retain a post supplied from the post magazine, the post driver adapted to continuously drive such post.

Abstract: An articulating derrick having a back face, a pair of opposed sides with each side having at least one leg, and an open face. The back face of the derrick includes a plurality of pairs of back face cross supports. Each cross support has a first and a second opposed end. Each first end is pivotally attached to one of the legs. A bushing pivotally connects the second ends of each pair of cross supports in order to permit movement of the back face between a folded, storage position and an open position.

Abstract: A post driver which is mounted to the three-point hitch of a tractor is provided with a support to reduce wobble of the post driver during operation and to facilitate mounting of the post driver to the tractor's three-point hitch. The post driver has a carriage and a ram movable vertically relative to said carriage. The carriage is mounted to a base. The base includes a mount adapted for mounting the post driver to a hitch of a vehicle. A support frame depends from the mount rearwardly of the carriage. The frame has a vertical member and a horizontal member, and generally vertically extending legs at the ends of the horizontal member. The legs are mounted to the horizontal member to be movable vertically relative to the horizontal member. The legs are spaced equidistantly from the carriage of the post driver.

Abstract: A multiple position stakedown assembly for a horizontal directional drill machine which installs stakes into the ground in a variety of different locations with a single drive head. The stakedown assembly includes a vertical tower that is rotatably mounted on a base plate. Locator ports for the stakes are provided in the base plate in a segmentally circular pattern around the tower. A drive head cantilevered from the top of the tower rotates with the tower to positions where it can install stakes through any of the ports.

Abstract: The present invention is directed to a multi-linked working boom for a working machine which carries at the other end a hydraulically maneuverable and hydraulically driven working equipment, where the boom comprises a first pair of link arms which is connected to the working machine and a second pair of link arms which is jointed to the first pair of link arms via a link arm-forming support member, which is intermittently fixable against a support foundation by means of the first pair of link arms.

Abstract: In the arrangement, a feed beam made of an aluminum profile comprises a slide guide frame, whereby the outer surface of the slide guide frame and respectively, the inner surface of the slide guide are shaped and dimensioned in such a manner that when the slide guide is on the slide guide frame, they are tight against one another. The other edge of the slide guide flame and respectively, the corresponding edge of the slide guide are shaped in such a manner that when the slide guide is mounted in place, its edge is shape-locked relative to the slide guide frame. The slide guide is also secured by separate securing mechanism to the feed beam in such a manner that it cannot move either in the cross or longitudinal direction relative to the feed beam.

Abstract: In an electric hand tool, particularly a drill, with a housing, an electric motor which is received in the housing and has a motor shaft parallel to the housing axis, and with a work spindle which is driven by the electric motor via a transmission gearing, the housing is divided along a dividing plane for the purpose of switching from straight drilling to angular drilling and it is provided that the front housing part containing a bearing for the work spindle and the rear housing part containing the electric motor can swivel relative to one another in such a way that the work spindle projecting out of the front housing part can occupy any angle between 0.degree. and 90.degree. or more relative to the motor shaft. A catch lock which can be unlocked and/or locked manually stops the two housing parts in the selected swivel position. A torsionally rigid transmission of force from the motor shaft to the work spindle is realized in every swivel position of the housing parts in the transmission gearing.

Abstract: A tractor mounted stake driver provides a mechanical/hydraulic system to drive a plurality of stakes into the ground simultaneously, with provision for stake separation adjustment. The apparatus includes a tractor and a front stake driving assembly including a right and left front stake driving ram joined by a separation adjustment device. The apparatus may further include a rear stake driving assembly to enable four stakes to be driven simultaneously. Either the front or rear assembly may additionally include a fore/aft adjustment mechanism to enable selective spacing between the front-driven stakes and rear-driven stakes.

Abstract: An apparatus for processing soil in a subterranean earth situs. The apparatus includes a parallelogram spotter or positioning portion with a drilling table support portion connected thereto. A rotary drilling table is mounted on the drilling table support portion. Relative movement is provided between the support portion and the positioning portion in a plurality of planes. A pivotation portion is disposed between the support portion and the positioning portion and pivotally connected thereto. Hydraulic cylinders are provided to shift the apparatus about a vertical axis, to move the drilling table support portion in a longitudinal direction, to tilt the pivotation portion and support portion about a horizontal axis and to tip the support portion with respect to the pivotation portion about a longitudinal axis. A table elevation winch is mounted on the support portion and has a table elevation cable extending therefrom which is engaged with a pulley connected to the support portion.

Abstract: A hole digger assembly which includes a truck, a turntable on the truck, a boom mounted to the truck via links, cylinders between the links and the turntable and between the boom and the turntable for moving the boom, a drill mechanism which is mounted to the boom, and a cylinder for moving the drill mechanism between an operative position and a storage position at which the drill mechanism is parallel to the boom and partly located between two opposed side walls of the boom.

Abstract: Mounting for a swingable suspension of a cutter hammer to a boom or the like which is tiltable about a horizontal axis, with the cutter hammer being floatingly suspended and swingable transversely to the tilting plane about an axis which extends in the tilting plane of the boom, wherein the cutter hammer (2) is locked in the desired swinging position relative to the boom (1) by a form-fitting coupling (6, 7, 8, 9).

Abstract: Drilling equipment including apparatus for laterally moving a direct drive drilling unit to a position offset from the centerline of a well. The drilling equipment includes a traveling block suspended for generally vertical travel within a derrick during drilling of a well, a direct drive drilling unit suspendable from the traveling block, means for guiding the drilling unit during drilling and apparatus connected to the derrick for moving the drilling unit laterally relative to the axis of the well to an offset position. The drilling unit includes a drill motor and a drive sleeve for threadably connecting the drill motor to a drill string in the well. The guide means includes a first pair of rails connected to the derrick and extending parallel to the axis of the well. The apparatus includes a second pair of rails and means for supporting the drilling unit. The second pair of rails is positionable below and in alignment with the first pair of rails when the support means is in the offset position.

Abstract: A safety stabilizer for an auger having a screw, and an engine, and handles, and having two stabilizer legs, swingable upper joints on each leg, and anchors on the lower end of each leg.

Abstract: A feeding device for a rock drilling machine (3) comprising a cradle (1); and a feeding beam (2) mounted longitudinally displaceably with respect to the cradle (1), the drilling machine (3) being displaceable along the feeding beam. Displacing means comprise a chain (6) forming a closed loop, being arranged to move around turning wheels (4, 5) provided at both ends of the feeding beam (2), and connected stationary with respect to the drilling machine (3). The drilling machine (3) is arranged to be connected stationary with respect to the feeding beam (2) over its whole range of movement relative to the feeding beam (2) and the feeding beam (2) with respect to the cradle (1) over its whole range of movement relative to the cradle (1).

Abstract: A multi-function control actuating mechanism for a roof drilling and bolting machine includes an actuating rod having a first end and a second end. The actuating rod is of a predetermined length and is mounted for movement in a longitudinal direction. A sleeve includes a first end and a second end. The sleeve is mounted for limited rotational movement and is positioned around the actuating rod and extends along a portion of the length thereof. A first bracket is secured adjacent to a first end of the sleeve. A second bracket is secured adjacent to a second end of the sleeve. An actuating lever is operatively connected to the second bracket and to a second end of the actuating rod.

Abstract: A machine for working rock, especially a block drilling machine, comprising at least one working tool, especially drilling tool. The drilling unit comprising the drilling tool is adapted to be connected to a supporting means in such a way that it has three degrees of freedom of rotation relative to the supporting means, which means it is movable, i.e. rotatable, relative to the supporting means about three axes which are respectively normal to each other. Furthermore the supporting means itself has at least two degrees of freedom of rotation relative to the ground. In particular, the supporting means can be pivoted about an axis which is approximately normal to the ground and an axis which is approximately parallel thereto, respectively.

Abstract: Apparatus for excavating a tunnel of generally quadrilateral cross-section, the apparatus comprising a cutting head having the head being mounted for rotation about a first axis and a second axis to change the angle of inclination of the cutter. The cutter may be retracted on its support and may be moved transversely of the excavation on a slide, horizontally. It may be moved vertically by mounting the head on an arm pivotally mounted or in another embodiment by mounting the head on a vertically movable carrier carried on a slide. This can be used for excavating by making a set of cuts at various angles; first and second slots are generally parallel at the face but the first slots are inclined to the second, and to the face, so that they intersect. A third set of slots may intersect the first and second sets (for example, vertically) to separate the material from the face in convenient-sized blocks.

Abstract: A drilling mast assembly (20) mounted on a vehicle (24) for operation in a vertical position and comprising an elongated main mast (44), a secondary mast unit (46) swingably mounted on the main mast (44) for movement from a locked position aligned and contiguous with the main mast (44) to a position swung away from the main mast (44), percussive unit (48) mounted on the secondary mast unit (46) and having a sinker drill (48) movable vertically relative and parallel to the main mast (44) for forming an initial opening in a surface therebelow, and an auger unit (49) having an augar drill (51) mounted on the main mast (44) for vertical movement relative and parallel to the main mast (44) along a longitudinal axis aligned with the longitudinal axis of the percussive sinker drill (48).

Abstract: A mine bolter machine has a main body supported by wheels and a main drill system structure forward of the main body. The main drill support is transversely movable relative to the main body and supports a first and second drilling mechanism. The first drilling mechanism is movable to the left of the main support structure and the second drilling mechanism is movable to the right of the main support structure.

Abstract: In an earth drill rig wherein an upwardly and downwardly moving drill-string-turning rotary table is rotated by a kelly bar connected at its lower end to a vertical drive shaft, the kelly bar being journaled for rotation in and the rotary table being mounted for axial movement on a drill frame assembly, the drill frame assembly being mounted on a vehicle for pivoting between an upright position and a substantially horizontal position for transportation, a frame assembly pivot is positioned below the lower end of the kelly bar and a universal coupling connects the lower end of the kelly bar and the vertical drive shaft.

Abstract: The invention is directed to a device for performing remotely-manipulated intenance work with a motor-driven tool such as an impact wrench or the like on conduits and process components arranged in a shielded, radioactively-ladened cell. The device includes an impact wrench mounted in a carrier frame. The impact wrench can be remotely-controlled in a vertical or a horizontal working position and is movable on the cable hoist of a remotely-controlled crane. The carrier frame is provided with motor-driven retractable and extendable torque bracing spindles on its longitudinally extending sides to prevent twisting of the impact wrench and carrier frame in the vertical working position about the cable of the cable hoist.

Abstract: The machine comprises an automobile vehicle provided with a pivoting boom to which is pivotably mounted a beam carrying a pivotally mounted swingle-bar to which is coupled a rotary plate for supporting a frame provided with guiding uprights for a sawing unit. Hydraulic cylinders and motors are provided for adjusting respective positions of the boom, beam, swingle-bar, rotary plate and motor means of the sawing unit. Means are provided to maintain the frame in a fixed position when working a sawing step.

Abstract: A universal driver tool pivotable into a plurality of angular positions is disclosed for use by a computer controlled robotic manipulator. Improved mechanism for connecting the driver tool to the pneumatic system of the robot is disclosed as is a technique for quickly changing the bit driver by the tool without requiring a complete tool change operation.

Abstract: A control mechanism for selectively positioning an upright earth working tool carried by a portable vehicle having a source of pressurized hydraulic fluid. The control mechanism includes a shaft rotatably carried on a horizontal base plate at the front end of the vehicle, and pivotally connected to a carrier member for the earth working tool for tilting movement of the carrier member laterally of the vehicle. A first hydraulic cylinder assembly for longitudinally tilting the working tool is pivotally connected at its rearward end on the shaft and at its forward end to the carrier member. A second hydraulic cylinder assembly for tilting the carrier member transversely of the vehicle has one end pivotally mounted on the base plate and is pivotally mounted at its other end to the shaft so that on rotation of the shaft the carrier member is tilted transversely.

Abstract: A launching device for launching a percussion borer at the start of a ground boring operation comprises a carrier for holding the borer with mounting means which permits the borer to move forwards relative to the carrier in a boring movement but resists backward movement, and a base plate which, in operation, is anchored to the ground and on which the carrier is adjustably mounted. The adjustment of the carrier on the base plate enables the borer to be accurately directed in the correct direction in which the boring is to be made and when the borer is set in operation, rearward impulses on the borer are transmitted through the carrier and the base plate to the ground by which they are counteracted.

Abstract: A drilling machine is disclosed for use in providing bolt holes in concrete stadium riser steps and the like. The drilling machine includes a relatively stationary base plate, and a foot plate slideable upon the base plate along a predetermined path. The foot plate carries drill mounting means for mounting a plurality of commercially available drills. An operating lever moves the foot plate, drill mounting device and drills toward and away from a vertical drilling face over the base plate.

Abstract: The guide frame of a post driver is supported in an adjusted position by the three-point hitch of a tractor and its driver element is displaced upwardly by a friction drive assembly carried by the guide frame and driven by a power take-off from the tractor. The guide frame is adjustably positioned both laterally and longitudinally of the forward direction of travel of the tractor vehicle.