Abstract: The invention relates to a pneumatically operated drill hammer, comprising a piston and a distributor axially arranged relative to each other in a housing, the piston being arranged to be moved axially between a first position and a second position. The drill hammer further includes a pneumatic drive system, including a drive chamber, a return chamber and a plurality of channels for distribution of drive gas in said drive system. The return chamber is arranged at a lower side of the piston and the drive chamber is arranged at an upper side of the piston, wherein the drive chamber is defined by a variable space enclosed by at least the housing, the piston and the distributor. The drive chamber includes at least one inlet port and at least one exhaust port arranged at a circumference of the drive chamber.

Abstract: A hand-held power tool, in particular a hammer drill or combination hammer, having a tool fitting for holding a striking and rotating tool on a working axis, an electric motor coupled to a transmission shaft, an impact mechanism, which has a striker that is moved periodically along the working axis, and having a rotary drive, which drives a guide tube carrying the tool fitting in rotation about the working axis, wherein the rotary drive is coupled to the transmission shaft via a rocker lever.

Abstract: A powered ratcheting wrench includes a main housing defining a grip portion, a motor having a motor drive shaft, a drive assembly coupled to the motor drive shaft and driven by the motor, and an output assembly coupled to the drive assembly. The output assembly includes an output member that receives torque from the drive assembly, causing the output member to rotate about an axis. The powered ratcheting wrench further includes a head housing coupled to the main housing and supporting at least a portion of the drive assembly. The head housing is composed of an aluminum alloy resulting in a center of gravity for the power tool to be proximate the grip portion.

Abstract: A hand power tool includes at least one electric-motor drive that is configured to act upon at least one motor shaft, and that is accommodated by a first housing part, the motor shaft and the first housing part defining a first common axis. The electric-motor drive is an electronically commutated electric motor. The hand power tool further includes at least one output shaft configured to drive a tool in an oscillating manner, and at least one second housing part that is configured to accommodate a rechargeable battery, the rechargeable battery and the second housing part defining a second common axis.

Abstract: An accessory for a power tool includes a blade and a coupling. The coupling includes a blade portion, a tool portion, and a transition. The blade portion is fixedly coupled to the blade. The tool portion is configured to be removably coupled to the power tool. The tool portion also includes an opening. The transition extends between the blade portion and the tool portion, and the transition includes a first transition region, where the transition intersects with the blade portion, and a second transition region, where the transition intersects with the tool portion. The first transition region includes a first arc having a center that is arranged between the first arc and the opening, and the second transition region includes a second arc having a center that is arranged between the second arc and the opening.

Abstract: The present invention discloses an impact ice driller, which comprises a frame; a motor; a rotatable drill stem; a stationary element and a rotatable element disposed along a same axis and facing each other; wherein the stationary element is connected to the frame; the rotatable element is connected to the drill stem and synchronously moves with the drill stem as driven by the motor; the stationary element and the rotatable element each has an irregular surface capable of engaging with each other on each opposite surface, when the rotatable element rotates, the irregular surface of the stationary element and the irregular surface of the rotatable element can repeat engagement and separation, so that the rotatable element can repeat the movement along an axis relative to the stationary element. In this way, the drill stem can produce up-and-down impacts on ice cover ceaselessly in the ice drilling process with good ice drilling effect.

Abstract: A hand power tool includes at least one electric-motor drive that is configured to act upon at least one motor shaft, and that is accommodated by a first housing part, the motor shaft and the first housing part defining a first common axis. The electric-motor drive is an electronically commutated electric motor. The hand power tool further includes at least one output shaft configured to drive a tool in an oscillating manner, and at least one second housing part that is configured to accommodate a rechargeable battery, the rechargeable battery and the second housing part defining a second common axis.

Abstract: Guide blades for use with oscillating and reciprocating power tools and provide improved speed and safety, as well as protection against the cutting blades protruding outside of a desired area or beyond a specified surface depth are disclosed. The guide blades include a blade portion with a cutting edge, an adapter corresponding to a particular type oscillating power tool, an attachment base for attaching the guide blade to the oscillating power tool, the attachment base including an offset portion for attachment of the blade portion to the attachment base, and an accessory attachment portion with an opening for securing the adapter to the attachment base, and a rounded guide affixed to the blade portion between the cutting edge and the offset portion, the rounded guide extending from side-to-side and curved away from the offset portion and toward the cutting edge, wherein the rounded guide provides for variable cutting depth.

Abstract: In accordance with an aspect of the application, a device for the driving in of an affixing element into a substrate has an energy transfer element for the transfer of energy to the affixing element. Preferably, the energy transfer element can be moved between a starting position and a placement position, wherein the energy transfer element is located in the starting position before a driving-in process and in the placement position, after the driving-in process. In accordance with another aspect of the application, the device comprises a mechanical energy storage unit for the storage of mechanical energy. The energy transfer element is then preferably suited for the transfer of energy from the mechanical energy storage unit to the affixing element.

Abstract: A hammer drill serving as an impact tool is provided with a crank housing that accommodates a crankshaft, and a cylinder accommodated in the crank housing. Receiving portions that receive the cylinder which is pressed rearward are provided at multiple locations of the crank housing in the front-rear direction. At least one of the receiving portions is disposed to receive the rear-end portion of the cylinder. A portion of the cylinder, which is received by another one of the receiving portions is a circlip (circumferential member) made of a metal.

Abstract: A hand tool is disclosed, comprising a housing, a motor shaft being coupled to a drive motor, a working spindle configured for being driven rotatingly oscillatingly about its longitudinal axis, and a coupling element being driven rotatingly by the motor shaft and having a closed guide surface that revolves around the motor shaft. The guide surface is coupled, via transmission means, to at least one driver for driving the latter. The at least one driver is arranged movably relative to the working spindle and engages the working spindle at a circumferential region thereof for driving the latter rotatingly oscillatingly.

Abstract: In an upper surface of a crank housing is provided an inlet for grease which is configured to be openable and closable by a cap. A vibration damping mechanism, which includes a counterweight provided with a connecting pin loosely fitted in a connecting hole of an eccentric pin when the cap is attached, is mounted in the cap, whereby the vibration damping mechanism is allowed to be taken in and out of the crank housing through the inlet by attachment and detachment of the cap to and from the inlet.

Abstract: In an upper surface of a crank housing is provided an inlet for grease which is configured to be openable and closable by a cap. A vibration damping mechanism, which includes a counterweight provided with a connecting pin loosely fitted in a connecting hole of an eccentric pin when the cap is attached, is mounted in the cap, whereby the vibration damping mechanism is allowed to be taken in and out of the crank housing through the inlet by attachment and detachment of the cap to and from the inlet.

Abstract: A portable power tool has a housing, a rotating sleeve provided for rotatably driving a tool and a rotatably supported in the housing by at least one bearing, a driving gear-wheel installed on the rotating sleeve in a freely rotating manner and drivable by a motor, a safety clutch that couples the driving gear-wheel with the rotating sleeve in a rotation-proof manner, the safety clutch having two clutch members that are slippable, with one of the clutch members being assigned to the driving gear-wheel and the other clutch member being assigned to the rotating sleeve in both cases in a rotation-proof manner, and with a coupling sleeve providing a force against which the clutch members are slippable when a limit torque is exceeded, the bearing being seated on the rotating sleeve in an axially displaceable manner and loaded by the coupling sleeve of the safety clutch against an axial stop of the rotating sleeve.

Abstract: A driving device for installing a pipe or casing, without the use of hydraulic or pneumatic means, by capturing the rotational motion of the drill string. The driving device is placed at the top end of the pipe being (42) installed and the drill string (2) passes through the center of the device. The drill string freely rotates, advances or retracts within the driving device, until the driving device is attached (4) to the drill string when required. When the driving device is attached to the drill string, the rotational force of the drill string and any downward force applied to the drill string are captured, and used to install the pipe. The driving device uses the rotation of the drill string to impact a blow to the pipe, driving the pipe downward. The driving device uses any downward force applied to the drill string to maintain downward pressure on the pipe.

Abstract: A driving tool includes a block and an impactor received in a front and a rear chambers of a handle, a driving shank attached to the block, and a plunger engaged between the block and the impactor. The impactor includes a cavity formed in one end for selectively receiving the tip of the plunger and for impacting onto the plunger and the block and the driving shank when the tip of the plunger is aligned with and engaged into the cavity of the impactor. The block has a guide device for guiding the block and the driving shank to rotate relative to the handle.

Abstract: The invention is based on a hand power tool, in particular a hammer drill, with a drivable drive mechanism (12) accommodated in a housing (10) and a mechanical hammer unit (14), which is for percussion-driving a tool (16) in a tool holding fixture (18) and has a hammer (20) that can be driven in its hammering motion by a driver unit (22), which has at least one annular curved path (24, 26) with raised areas and recessed areas oriented axially toward the tool and has a feeler unit (28), which is operationally connected to the hammer (20) and which, by at least one feeler element (30), can be brought into operational connection with the raised areas and recessed areas of the curved path (24, 26). The invention proposes that the feeler unit (28) has at least two feeler elements (30) that can be brought into operational connection with the curved path (24, 26).

Abstract: A pneumatic ratchet drive wrench of the present invention includes a pair of single springs that each bias a corresponding pawl into engagement with an output member and inhibit counter-rotation of the output member opposite the corresponding pawl. The pawl and spring construction allows the wrench head to be smaller than conventional pneumatic ratchet drive wrenches, providing better wrench access into small spaces. The spring is inexpensively formed as one piece of spring wire having independent spring coils for biasing the pawl and inhibiting counter-rotation of the output member.

Abstract: A power tool has a drive mechanism with an output shaft which performs an intermittent rotary motion. The output shaft drives, via an overrunning clutch, a tool drive shaft to drive a tool, which thus performs a quasi-continuous rotary motion that, as the load on the machine increases, transitions increasingly into a discontinuous rotary motion. The power tool can advantageously be used as a hand-held power tool for screwing, drilling, sawing, sanding, and the like, a high output torque with a low reaction torque being achievable as a result of the intermittent drive mechanism.

Abstract: An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impact energy to the formation and rotates during operation independent of an attached drill string.

Abstract: Driving means in particular for a cutting-off device with a rotationally held cutting-off tool. In order to provide the cutting-off tool with high acceleration in a simple manner, a sledge hammer (6) is provided that cooperates with an impact surface (5) arranged on a rotationally held cutting-off tool (4). Furthermore, a cam (2) is arranged on at least one driven rotating inertial body (1) for acting upon said sledge hammer, whereby said inertial body (1) is driven at an essentially constant, optionally adjustable speed.

Abstract: A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing controls fluid pressure to the working end so that the tool pressures up, then releases pressure through the working member allowing the pipe string to load the bit, creating impact. A clutch rotates the working member during drilling to prevent imprint upon the formation. A bias spring is provided to control and adjust the amount of weight on the bit independent of pipe weight.

Abstract: A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing controls fluid pressure to the working end so that the tool pressures up, then releases pressure through the working member allowing the pipe string to load the bit, creating impact. A clutch rotates the working member during drilling to prevent imprint upon the formation.

Abstract: The drill has a housing receiving therein a reciprocating striker, effecting percussive action upon the tool for breaking the rock at the face of the hole, mounted at the forward part of the housing, and upon the housing itself for propelling the drill in the hole. The housing also receives therein a mechanism for rotating the tool, including a self-controlled coupling provided with a movable sleeve and a stationary sleeve and adapted to transmit a torque to the tool in only one direction of rotation. The drill is provided with a device preventing a rearward motion of the housing and its rotation during a drilling operation. The drill is characterized by having a return device for retracting the tool from the face after it has been struck by the striker.

Abstract: The machine has a braking arrangement for retaining it against rearward motion and rotation and includes a housing accommodating therein a hammer reciprocable in operation of the machine and adapted to strike the head part of the housing, the latter having a drilling tool rigidly connected thereto. The tail part of the housing supports a sleeve rigidly connected with the braking arrangement. The housing and the sleeve are connected so that the housing is rotatable and axially displaceable relative to the sleeve. The drilling tool rotating mechanism is positioned intermediate the sleeve and the housing and includes a helicoidal couple made up by a helicoidally threaded rod rigidly secured to the housing and a nut, the mechanism further including a freewheeling clutch of which the movable cage is made integral with the nut.

Abstract: An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impact energy to the formation and rotates during operation independent of an attached drill string.