Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7419015 | Rock drilling machine and axial bearing An axial bearing includes a first piston and a second piston. Axial contact surfaces between the pistons are arranged in the same pressure space. The same pressure fluid fed to the axial bearing acts on the contact surfaces and on working pressure surfaces of the pi... | 09/02/2008 |
| 7404452 | Percussion power tool apparatus A percussion power tool apparatus includes a body relative to which an impacting tool is moved to effect an impacting operation, the apparatus further including an operating member by means of which an operating load is applied in an operating direction to the appar... | 07/29/2008 |
| 7396197 | Force-balanced air supply for pneumatic tools The non-axial force exerted on a pneumatic tool by a non-axial air supply is balanced to allow for uniformly radially distributed compliance forces on the tool. An annular air ring is disposed around the pneumatic tool, covering an air inlet port. Air is supplied by... | 07/08/2008 |
| 7331408 | Power tool housing A transmission housing for a hammer drill comprises two clamshell halves and that mate to define a first transmission housing chamber and a second transmission housing chamber disposed on either side of a ball bearing race. The first and second transmission housing ... | 02/19/2008 |
| 7322425 | Method of generating stress pulse in tool by means of pressure fluid operated impact device, and impact device A method of generating a stress pulse, and an impact device. In the method, pressure fluid is fed as pressure pulses to a working chamber residing between the frame of the impact device and a tool such that the resulting force presses the tool towards the material t... | 01/29/2008 |
| 7306048 | Hammer drill having switching mechanism for switching operation modes An air chamber is formed in a cylinder between a piston and a striking member. The cylinder is formed with at least one through-hole for providing fluid communication between the air chamber and an outside of the cylinder. A switching mechanism switches operation mo... | 12/11/2007 |
| 7252157 | Power tool It is an object of the present invention to provide a power tool having a further improved vibration reducing performance. The representative power tool may comprise a tool bit, an actuating mechanism, a dynamic vibration reducer. The actuating mechanism drives the ... | 08/07/2007 |
| 7252158 | Pilot valve for a pneumatic tool A pneumatic tool (20) for impacting a workpiece (22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exha... | 08/07/2007 |
| 7234548 | Hydraulic rotary-percussive hammer drill A hydraulic rotary percussive hammer drill includes a body containing a reciprocating percussion piston sliding under the effect of a main hydraulic supply circuit, this main circuit also being intended to cause the sliding of a roughly annular abutment piston house... | 06/26/2007 |
| 7204322 | Power tool having pneumatic vibration dampening It is an object of the present invention to provide a vibration reducing technique caused by air pressure fluctuations within a power tool. According to the present invention, a representative power tool may comprise a driving motor, a driver and a tool bit. The dri... | 04/17/2007 |
| 7156190 | Impact tool An impact tool has a slidable hammer that is driven by hydraulic oil under pressure inside a chamber. The hydraulic oil is pressurized by a piston driven by compressed gas on the opposite side of the piston from the hydraulic oil. The gas in the gas chamber is compr... | 01/02/2007 |
| 7143842 | Power tool It is an object of the invention to provide a reciprocating power tool having a further improved power transmitting mechanism for converting a rotating output of a driving motor into linear motion in the axial direction of the tool bit. The representative reciprocat... | 12/05/2006 |
| 7140450 | Percussion tool A percussion tool is described and which includes a housing mounting a tool bit; a reciprocally moveable hammer borne by the housing and which is operable to repeatedly strike the tool bit; and a reciprocally moveable piston enclosed within the hammer and which impa... | 11/28/2006 |
| 7066279 | Pneumatic ground piercing tool A ground piecing tool includes a housing and an air distributing mechanism that reciprocates a striker to impact a chisel shaft in response to a supply of compressed fluid including a fluid inlet tube mounted in the bore of the striker having a radial port, a rear e... | 06/27/2006 |
| 7036607 | Electric hand tool An electric hand tool is disclosed which has a gt (15), received in a housing (10), with a gear shaft (20) and also has at least one radial bearing (30) for rotary support of the gear shaft (20), the inner bearing ring (301)... | 05/02/2006 |
| 7032688 | Shock absorbing valve for a pneumatic tool A pneumatic tool (20) for impacting a workpiece (22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exha... | 04/25/2006 |
| 7032684 | Method of opening joints between drilling components, and rock drill A rock drill includes a string of components interconnected by screw threads and connected to a shank. A percussion piston is reciprocated against the shank during a drilling operation, while a support device applies axial support to the rear of the shank, to enhanc... | 04/25/2006 |
| 7021401 | Hammer An electrically powered hammer comprising a hammer housing (10,15) with a hollow cylindrical spindle (4) mounted within it and an air cushion hammering mechanism mounted within the spindle for generating repeated impacts on a tool or bit of the hammer ... | 04/04/2006 |
| 6971455 | Hammer drill with a mechanism for preventing inadvertent hammer blows A hammer drill (1) includes a lock plate (35) forward of a boss sleeve (13) and a swash bearing (14) which cooperates with the boss sleeve to convert the rotation of an intermediate shaft (5) on which the boss sleeve is mounted. Th... | 12/06/2005 |
| 6955230 | Hammer drill and/or chipping hammer The invention is based on a hand power tool, in particular a drill- and/or chipping hammer, comprising a striking mechanism (10) that has a drivable pot-type piston (12) with at least one idle opening (14). It is proposed that the idle op... | 10/18/2005 |
| 6948571 | Hammer An electrically powered hammer comprising a hollow spindle within which spindle is reciprocatingly mounted a piston, a ram, a beatpiece having an increased external diameter mid-portion and located within the spindle between the ram and the tool or bit, a two part s... | 09/27/2005 |
| 6938705 | Striking tool A projected portion provided at a cylinder and projected in a radius direction is formed at an end face thereof on a side of a tool holding portion, and a holding portion on one side of holding portions for holding an outer periphery of the cylinder by at least two ... | 09/06/2005 |
| 6932166 | Pneumatic tool A pneumatic tool (20) for impacting a workpiece (22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exha... | 08/23/2005 |
| 6923269 | Demolition hammer and/or hammer-drill with a percussion device suitable for releasing clamped objects by striking The invention relates to a demolition hammer and/or hammer drill comprising a percussion generating device having a percussion piston moving axially back and forth. In a main percussion mode, the percussion piston impinges upon a tool which can move along a limited ... | 08/02/2005 |
| 6905056 | Setting tool A setting tool for driving fastening elements in a constructional component includes a drive piston displaceable in the guide space (11) of the piston guide (12) by propellant gases generated by a propellant charge from an initial position (40) ... | 06/14/2005 |
| 6904980 | Linerbolt removal tool A pneumatic linerbolt removing tool including a moil supported for reciprocal movement along a hammer axis within a housing, an inertial body movably mounted along the hammer axis, and a piston assembly moveable within the inertial body along the hammer axis between... | 06/14/2005 |
| 6827156 | Vibration suppressing device for air hammer An air hammer includes an air hammering mechanism and a vibration suppressing device to absorb the vibration transmitted from the air hammering mechanism. The vibration suppressing device includes a cylinder forming a front channel and a rear channel in communicatio... | 12/07/2004 |
| 6808026 | Pneumatic percussive tool with a short working drive piston A pneumatic percussive tool for a paving breaker and/or a hammer drill, provided with a drive piston which is axially displaceable both backwards and forwards, comprising a guide sleeve and a piston bottom supporting the guide sleeve. A percussion piston can be disp... | 10/26/2004 |
| 6732815 | Hammer An electrically powered hammer comprising a hollow spindle within which spindle is reciprocatingly mounted a piston, a ram, a beatpiece having an increased external diameter mid-portion and located within the spindle between the ram and the tool or bit, a two part s... | 05/11/2004 |
| 6564688 | Recoilless impact device An apparatus for generating an impact against a target object comprises a driver reciprocally disposed in a housing. The driver includes a hollow tube having a closed end and a nozzle sealing the other end. A piston is slidably positioned in the tube. Pro... | 05/20/2003 |
| 6561285 | Breaking apparatus and tool A breaking apparatus, which comprises a percussion device (1), and in the extension thereof, a tool (3) to which a percussion piston (2) belonging to a percussion device delivers impacts. In the axial direction, the movement of the tool is limited by a st... | 05/13/2003 |
| 6523622 | Pneumatic percussion power tool with pneumatic returning spring A pneumatic percussion power tool has a percussion tool housing in which a drive piston and a percussion piston are movable in an axial direction. The motion of the drive piston, which is generated by a crank mechanism, is transmitted to the percussion pi... | 02/25/2003 |
| 6481509 | Impact generator In a conventional impact generator, a great shock is generated when a weight collides with a rotary member, and a rotary shaft of the rotary member and a bearing supporting the rotary shaft receive the great shock. Therefore, it is necessary to employ a b... | 11/19/2002 |
| 6467555 | Percussion mechanism for an electrical hand-held tool with a blank blow cut-off A percussion mechanism for an electrical hand-held power tool including a guide tube, a percussion piston (4) axially displaceable in the guide tube (2), an anvil (5) for impacting a working tool and axially displaceable together with the percussion pisto... | 10/22/2002 |
| 6378951 | Vibratory pavement breaker An electrohydraulic pavement breaker system having cavities (28, 30) which are filled with hydraulic fluid (oil) or gas, and which provide mass spring system which is resonant at a frequency which is especially adapted for breaking and rubblizing concrete... | 04/30/2002 |
| 6364032 | Hand held apparatus for fracturing risers from castings A hand held-type apparatus for fracturing a gate or riser from a casting subsequent to a foundry pouring process. The apparatus operates off of a driven piston assembly, which upon a stroke of such causes a hammer end of the piston assembly to extend from... | 04/02/2002 |
| 6321854 | Power tool A percussion power tool assembly (10) comprises a hand-held percussion power tool (11), a chamber (12) mounted on the tool (11), and a fluid reservoir (14) supported independently of the tool (11). The percussion power tool (11) has a body (20) housing a ... | 11/27/2001 |
| 6318478 | Damper pressure control apparatus for hydraulic rock drill A damper pressure control apparatus for a hydraulic rock drill is automatically adjustable of damper pressure to be applied to a damping piston depending upon a thrust of a rock drill body and makes damping function and floating function effective even wh... | 11/20/2001 |
| 6273199 | Arrangement in rock drill and method of controlling rock drilling An arrangement in a rock drill comprising a shank and a percussion piston and lifting sleeve for moving the shank towards percussion piston, and a method of controlling rock drilling. The arrangement comprises a lifting sleeve around the shank and a plura... | 08/14/2001 |
| 6250401 | Rotary impacting apparatus A rotary impacting apparatus is provided which comprises a housing, a rotor rotatably accommodated in the housing, a driving source for rotating the rotor about a rotation axis, a main reciprocative implement reciprocatively held by the housing, and an im... | 06/26/2001 |
