Class 173/121 - Spring retracts hammer head

Subclass of Class 173 - Tool driving or impacting
Definition: Apparatus in which the recoil of the resilient element retracts
No. of patents: 38
Last issue date: 01/29/2008

Number	Title	Issue Date
7322428	Vibration reduction apparatus for power tool and power tool incorporating such apparatus A handle assembly for a power tool is described and includes a first substantially tubular body portion 210 which contains a first spring 212. A second body portion 216 is slidably mounted within first body portion 210 and contains a seco...	01/29/2008
7121165	Tool for wristwatch Substantially cylindrical head tube body, center tube body and tip tube body threadedly engage each other to thereby construct a tool main body of a tool for wristwatch. The through hole of the center tube body is provided with a partition part having a small-diamet...	10/17/2006
7059423	Jackhammer system A jackhammer system for reducing the vibration and noise experienced by an operator of the jackhammer. The jackhammer system includes a housing, a chisel movably positioned within a lower neck of the housing, a pair of flywheels rotatably attached to a pair of suppo...	06/13/2006
6997269	Attachment for impact hammer An attachment for an impact hammer for translating the hammer's typical forwardly directed impact force into a rearwardly directed pulling force while still allowing the user to maintain a conventional orientation of the hammer relative to the work piece intended to...	02/14/2006
6902093	Centering punch A centering punch includes a first body, a second body, a punching head, an elastic body, an elastic member, a push member, and a spring. Thus, the tapered portion of the punching head is moved along the tapered face of the first body, and the punching head is moved...	06/07/2005
6814159	Impact tool driver An impact tool driver includes a hollow holding member having a surrounding wall defining a chamber. A solid and rigid shank of a handle is formed with a V-shaped cam hole, and extends into the chamber such that the V-shaped cam hole is registered with two diametric...	11/09/2004
6386078	Screwdriver for operating self-tightening screw Screwdriver for operating self-tightening screw, including a grip; a striking mechanism disposed in the grip for providing a striking force; and a stem body slidably disposed in the grip. The top end of the stem body is drivingly engaged with the striking...	05/14/2002
6152245	Compressed-air-operated percussion mechanism A compressed-air-operated percussion mechanism includes a housing, a percussion body and a balancing body, which form an operating chamber therebetween. A secondary valve seals the operating chamber during an operating stroke and opens the chamber to evac...	11/28/2000
6000477	Apparatus for applying additional momentum Apparatus for applying additional momentum to the movement of a body adapted to reciprocate or flex through a substantially linear or arcuate path, notably of increasing the impact velocity of a linearly travelling weight upon an object. The apparatus inc...	12/14/1999
5971083	Pressure fluid operated impact mechanism Pressure fluid operated impact mechanism having a reciprocating working member (5), a stop member (17) and, formed between said members, a drive chamber (18) with seals (15, 16) and a regulating valve (21) co-operating with a supply opening (25) for press...	10/26/1999
5755292	Pressure medium operated impact mechanism A pressure medium operated reciprocating impact mechanism has at least one working member (7) and at least one stop member (15), which are axially movable with respect to each other, and a working chamber (22) for pressure medium is arranged in at least o...	05/26/1998
5586607	Manually operated chipping tool A manually operated tool for chipping material from a surface includes a plurality of axially extending needle-type chisels (8) located within a housing (1) and guided in a needle cage (12) positioned within the housing. The needle cage (12) is freely axi...	12/24/1996
5321999	Automatic impact screwdriver An automatic screwdriver is capable of generating an impact force on a screw that is being tightened or loosened. An action rod is disposed eccentrically in conjunction with a short helical spring. The eccentric position of the action rod is corrected by ...	06/21/1994
5320270	Electromechanical fastener driving tool An electromechanical tool for driving fasteners into a workpiece. The tool uses a single flywheel in combination with a clutch mechanism whereby a conically shaped flywheel frictionally cooperates with a corresponding drum to cause a driver which is coupl...	06/14/1994
5098004	Fastener driving tool A lightweight fastener driving tool capable of being battery powered utilizes a low cost fastener driving ram or blade that is normally located in a nip defined between a motor driven flywheel and an idler wheel. Upon the actuation of a trigger operated t...	03/24/1992
4967587	Impact calibration tool A tool 10 for creating a standard repeatable impact on a nuclear steam supply system (NSSS) structure to determine the response of an accelerometer to the impact of a known energy at a predetermined location on the structure. The tool 10 includes a barrel...	11/06/1990
4903784	Impact hammer power tool An impact power tool for use in delicate hand-working operations includes a body presenting a bore and a piston received within the bore and shiftable relative thereto. An impact transmitting member is also received in the bore and is shiftable relative t...	02/27/1990
4867252	Single-stroke pneumatic apparatus A single-stroke pneumatic apparatus incorporates a hollow cylindrical frame 1) with inlet and outlet ports (2,3). A handgrip (4) containing a directional flow control (5) is attached to the upper end of the frame. A striker (6) is provided in the bore of t...	09/19/1989
4862972	Single-blow pneumatic percussive tool A single-blow pneumatic percussive tool includes a hollow cylindrical casing (1) having inlet and outlet ports (2, 3). A hammer piston (4) mounted in the casing (1) divides the interior space of the casing (1) into lower and upper chambers (5,6). A workin...	09/05/1989
4765229	Portable vacuum pump for desoldering purposes A portable vacuum pump for desoldering applications has a hollow cylindrical barrel forming a vacuum cylinder containing a plunger. The pump has a trigger housing containing a single compression spring. The spring is mounted outside the barrel. No separat...	08/23/1988
4750568	Pneumatic rescue tool A hand-held pneumatic rescue tool may be driven from a bottled compressed gas. The driving gas is used only for the blow-striking stroke, while a compression spring is used to provide a force for the return stroke that is independent of the pressure of th...	06/14/1988
4747455	High impact device and method A high impact device, as for producing an impact of 1,000 foot pounds or more, includes a ram which is engageable by a pair of rotating flywheels. The ram may impact a tool, as of a chisel type adapted for demolition purposes, or having a enlarged head fo...	05/31/1988
4742875	Motor-driven hammer A motor-driven hammer may include an air motor, a DC motor operated from rechargeable batteries, or an AC motor operated from the commerical power supply. In one embodiment, the motor is coupled to reciprocate the hammer head by way of a cam is a tension ...	05/10/1988
4721170	Fastener driving tool A fastener driving tool is provided which employs a drive housing subassembly, preferably in the form of opposed cast metal housing sections, which encloses the flywheel and suitable bearings for rotating the same at high speed. This subassembly also supp...	01/26/1988
4694912	Controlled impact power tool An impact power tool for delicate hand working operations is provided which is especially adapted for detailed engraving, carving, and delicate stone setting applications. The power tool preferably includes a hand-held impact device, a piston received wit...	09/22/1987
4611742	Electromagnetically operated driving tool with air damper In an electromagnetically operated driving tool, in which a cup-shaped plunger carrying a driver blade is axially slidable in a solenoid, an air damper, combined with a check valve, is provided to damp the plunger during its backward movement to an inoper...	09/16/1986
4601350	Electrically-operated multi-needle chisel tool An electrically-operated multi-needle chisel tool including a housing having a front portion and a rear portion. An electric motor is mounted in the rear portion. A cylinder extends forwardly from the front portion of the housing. A piston is disposed in ...	07/22/1986
4558747	Impact devices A pair of rotating flywheels which engage a ram for moving a tool which impacts a part, such as a nail to be driven, are rotated in opposite directions from a single motor or other rotating means, through a pair of substantially identical gears, one of wh...	12/17/1985
4548278	Percussion tool A power operated percussion tool in which a shoulder (28) in the tool housing (10, 17) defines a rear rest position for working implement (12) attached to the tool, and in which an energy absorbing bias unit (23, 31) is arranged to resiliently load the wo...	10/22/1985
4515303	Electric hammering apparatus with air-cushioned armature To prevent bounce of a hammer or plunger element coupled to an insertion blade of a stapling or nailing gun upon return of the plunger element to rest position by a spring (11), the plunger element (4) is in cup shape, sliding about a hollow cylinder (6) ...	05/07/1985
4462468	Ram head for self-driven pneumatic ram drills A ram head for self-driven pneumatic ram drills for producing boreholes in the earth, having a generally tubular housing within which there is movable axially back and forth an impact piston whose impact energy can be transmitted to the ram head arranged ...	07/31/1984
4323127	Electrically operated impact tool One or both of a pair of oppositely rotating bodies, such as motor driven flywheels, are mounted for pivotal movement against the side of a ram. One or more tension rods connect pivot shafts or members for equalizing precession and similar forces of rotat...	04/06/1982
4293045	Impacting device An impacting device useful with a pneumatic drive comprises a housing formed with an outer large-diameter bore and an inner small-diameter bore defining an annular shoulder at their juncture. A driving element within the large-diameter bore is limited aga...	10/06/1981
4289041	Reciprocator for use with rotary drills A device for driving a tool with a reciprocating motion utilizing a rotary electric or pneumatic hand drill as a power source. The device includes a main shaft adapted to be held in a three-jaw chuck of a hand drill and having a concentric sleeve-like rea...	09/15/1981
4192389	Single impact rivet gun A single impact rivet gun has a piston freely movable within a cylinder that is surrounded by an air accumulator. A valve to control flow of the air from the accumulator to the inside of the cylinder is located at one end of the cylinder and the valve has...	03/11/1980
4042036	Electric impact tool This invention relates to an electric impact tool characterized by a pair of electric motor-driven counterrotating flywheels, at least one of which is movable relative to the other from a retracted inoperative position into an extended operative one close...	08/16/1977
3974885	Pneumatic percussive power tool A power tool having a cylindrical housing accomodating a hammer and a two-step defining piston head, with central, rear and supplementary chambers in the housing, said head and supplementary chambers being constantly intercommunicated through a passage pr...	08/17/1976
3939921	Method and device for damping the movement of a hammer piston A method for damping the movement of the hammer piston of a hammer mechanism and for catching the hammer piston in a forward end position when the drill tool is situated outside the operating range of the hammer piston is disclosed. During the return stro...	02/24/1976

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Class 173/121 - Spring retracts hammer head