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"The abolishment of pain in surgery is a chimera. It is absurd to go on seeking it...knife and pain are two words in surgery that must forever be associated in the consciousness of the patient."
Dr. Alfred Velpeau, French surgeon ; 1839
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| Number | Title | Issue Date |
| 7246491 | Actuator An actuator includes a hollow cylinder which has a first portion and a second portion. The inner diameter of the first portion is larger than that of the second portion. A piston is inserted in the cylinder. The actuator has a gas generator which supplies a gas into... | 07/24/2007 |
| 7207116 | Air saw A main spindle of an air saw is reciprocated by sliding a piston in a cylinder chamber with the pressure of air supplied to the cylinder chamber via an air supply path so as to alternately apply the air pressure to pressure-receiving surfaces of a back plate and a f... | 04/24/2007 |
| 7112934 | Electrical power tool having a motor control circuit for providing control over the torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is operable in a ratcheting or pulse mode that causes the output spindle to ro... | 09/26/2006 |
| 6862973 | Pneumatic motor In one embodiment a pneumatic motor is provided that includes an intake chamber in fluid communication with at least one intake channel. Each intake channel is further in fluid communication with a corresponding cylinder, which receives a piston that cycles upwardly... | 03/08/2005 |
| 6629487 | High efficiency non polluting engine A high efficiency not polluting engine comprises at least a cylinder and at least a piston movable therein, the cylinder including, alternately, a pre-chamber in the cylinder head and/or a chamber for a direct injection mode of operation, the pre-chamber ... | 10/07/2003 |
| 6626079 | Pneumatic motor In one embodiment a pneumatic motor is provided that includes an intake chamber in fluid communication with at least one intake channel. Each intake channel is further in fluid communication with a corresponding cylinder, which receives a piston that cycl... | 09/30/2003 |
| 6230605 | Piston-to-cylinder seal for a pneumatic engine Within a piston cylinder of a pneumatic engine, the system includes a piston proportioned for complemental travel within a piston cylinder, the piston having a radial compression surface and elements for effecting the axial reciprocation of the piston wit... | 05/15/2001 |
| 6085631 | Piston-to-cylinder seal for a pneumatic engine Within a piston cylinder of a pneumatic engine, the system includes a piston proportioned for complemental travel within a piston cylinder, the piston having a radial compression surface and elements for effecting the axial reciprocation of the piston wit... | 07/11/2000 |
| 5417294 | Pneumatic hammer A hammer of the type having an impact tool driven by pressurized fluid has a hammer body portion with a closed rearward end and an open forward end and a piston longitudinally movably housed within the hammer body portion for striking a tool mounted at th... | 05/23/1995 |
| 5309713 | Compressed gas engine and method of operating same A compressed gas engine (20) has a piston (25) mounted for reciprocating movement within a cylinder (22). A valve (29) is slideably mounted on the cylinder head (31) to control the flow of compressed gas from a source (24) through an inlet (23) to a plenu... | 05/10/1994 |
| 5115717 | Ramming apparatus A ramming apparatus having a shortened length without sacrificing ramming power requirements is disclosed comprising a housing having a front end and a rear end, a pneumatically driven percussion piston having a front end and a rear end operatively mounte... | 05/26/1992 |
| 5085284 | Hybrid pneumatic percussion rock drill A fluid actuated percussion rock drill comprising a hollow wear sleeve and a piston slidingly disposed within the wear sleeve. Drive and return pressure surfaces bias the piston between drive and return positions, respectively. A high pressure port is inc... | 02/04/1992 |
| 4993501 | Hydraulic hammer in particular for use in dusty and/or corrosive environments A hydraulic hammer is provided, suitable for use as a crust-breaker of aluminum electrolysis pots, having a hydraulically actuated beating mass reciprocally movable in a cylindr to strike against a tool, an intake duct with a filter and a one way valve fo... | 02/19/1991 |
| 4945815 | Pneumatic type of reciprocating movement device A pneumatic type of reciprocating movement device capable of a high cycle speed over a short stroke. A rod member with a flange is slidably mounted in a cylinder member such that the flange divides a cavity in the cylinder into a left and right portion. I... | 08/07/1990 |
| 4885978 | Fluid-operated miniature engine Miniature engine operated by an expanding gaseous fluid, which comprises a cylinder (18), piston (20) and inlet valve (29), the upper part of the piston (20) cooperating with a radially expansible resilient diaphragm (28), which is secured to the piston (... | 12/12/1989 |
| 4681021 | Driving apparatus A driving apparatus for producing a to-and-fro movement and having four plunger cylinders and four external non-return valves. Such driving apparatus is distinguished by a particularly simple construction.... | 07/21/1987 |
| 4627241 | Closed loop solar collector system powering a self-starting uniflow steam engine A closed loop solar collector system (10) includes a fluid receiver (12) for collecting solar heat to vaporize a working fluid therein. A uniflow engine (15), connected to the receiver (12), is powered by the vaporized fluid to power a water wheel (19). T... | 12/09/1986 |
| 4526190 | Control valve assembly A control valve assembly for a pneumatic paving breaker which enables the maximum amount of energy to be imparted to the piston on its working stoke while restricting the energy imparted to the piston on its return stroke and which utilizes a reduced cons... | 07/02/1985 |
| 4467699 | Pneumatic motor A valveless, pneumatic motor including a cylinder within which a hammer piston reciprocates and a buffer ring fixedly secured within the cylinder. A source of motive fluid under pressure cooperates with the buffer ring which through supply porting provide... | 08/28/1984 |
| 4466493 | Reciprocating linear fluid motor Hydraulic fluid pressure moves a piston (22) against a body of incompressible fluid (14), compressing a spring (42). The pressure is released, and the force of the stored energy in the spring (42) is transmitted to the piston (22) by the body of fluid (14... | 08/21/1984 |
| 4448262 | Pneumatic hammer A starting arrangement for a reciprocating piston pneumatic hammer provides a passageway in the piston which couples a pneumatic piston subchamber to an exit port to exhaust pressurized pneumatic fluid from the subchamber to prevent the piston from center... | 05/15/1984 |
| 4446773 | Compressed air distributor for a reciprocating concrete breaking type machine A compressed air distribution system to control the movement of a reciprocating concrete breaking jackhammer wherein a plastic distributor made of two individual pieces is provided with a seat on each piece for a pellet moving therebetween is disclosed. T... | 05/08/1984 |
| 4401168 | Impact applying mechanism There is disclosed an impact applying mechanism, particularly as applied in a subterranean drilling apparatus, and comprising a cylinder (13) arranged with its axis substantially vertical and connected to the member to which impact is to be applied, a pis... | 08/30/1983 |
| 4355564 | Pneumatic reciprocating mechanism A pneumatic reciprocating mechanism comprising a working member (11) reciprocably powered in a housing (10) and forming together with a vibration absorbing reaction support member (12) and an elastic seal element (47) a working chamber (49) which is suppl... | 10/26/1982 |
| 4351225 | Vibration attenuation construction for an impact air tool A vibration and noise attenuating construction for impact air tools, such as a chipper, includes axially reciprocal working and balancing members which move toward and away from each other. The end of one member defines a cylinder and cylinder chamber whi... | 09/28/1982 |
| 4342543 | Oil level control An oil level control system uses an available pressure source to operate a fluid motor which is integrally connected with a reciprocating fluid pump. The pump has an inlet passage disposed at the desired oil level in a primary reservoir. A pair of one-way... | 08/03/1982 |
| 4340121 | Pneumatic rock drills A pneumatic motor for rock drills and the like having a reciprocating piston with valves at its opposite ends for valving motive air to the piston head from both ends of the cylinder. Large receivers are provided near the respective valves to accommodate ... | 07/20/1982 |
| 4303002 | Hand-operated pneumatic impact machine A hand-operated pneumatic impact machine comprising a hollow body with an axially-reciprocating impact ram inside which forms, together with the body, variable-volume working chambers. It also comprises a distributing space communicating with the working ... | 12/01/1981 |
| 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 |
| 4287810 | Drive for a pneumatic hammer A pneumatic drive for a hammer tool has a cylinder; a piston slidably received in the cylinder and dividing the inner space of the cylinder into two cylinder chambers; a drive output member formed as a piston rod attached to the piston and projecting from... | 09/08/1981 |
| 4283991 | Percussion mechanism Fluid-actuated percussion mechanism includes a housing with an internal cylindrical space receiving a reciprocating piston dividing the space into a working stroke chamber and an idle stroke chamber. The mechanism further includes fluid distributing means... | 08/18/1981 |
| 4283995 | Reciprocating engines In a hydrazine powered engine, an intake valve arrangement for positively controlling the opening and closing of the poppet valve in a hot gas cylinder, the poppet valve being operated by the piston and gas pressure only. The poppet valve uses a pneumatic... | 08/18/1981 |
| 4266465 | Percussion mechanism Fluid-actuated percussion mechanism includes a housing with an internal cylindrical space receiving a reciprocating piston dividing the space into a working stroke chamber and an idle stroke chamber. The mechanism further includes distributing means mount... | 05/12/1981 |
| 4254628 | Sliding-valve in a heating-chamber combustion engine A heating-chamber is provided for a heating-chamber combustion engine. A piston is provided with a detachable extension on the flat bottom of the piston, which towers upwardly and reaches during the upstoke into a pocket of the cylinder head. The detachab... | 03/10/1981 |
| 4248133 | Impact mechanism An impact mechanism operated with gaseous fluid under pressure fed from a source of fluid having a casing with an inner cylindrical space. A piston is accommodated for reciprocation within the cylindrical space of the casing to divide the space into a wor... | 02/03/1981 |
| 4194435 | Percussion mechanism The fluid-actuated percussion mechanism includes a housing with an internal ylindrical space wherein a reciprocating piston, which divides the space into a working stroke chamber and an idle stroke chamber, is received. The mechanism further includes fluid... | 03/25/1980 |
| 4168655 | Power output control system for vapor engine A vapor engine including a cylinder in which a piston reciprocates and having an inlet valve in the cylinder head which is driven from its seat by the piston as it approaches the cylinder head. The time at which the valve is driven from its seat does not ... | 09/25/1979 |
| 4136520 | Hydraulic pile driver A hydraulic pile driver of the kind having at least one hydraulic cylinder for raising a tup. An arrangement is proposed for allowing the use of oil as the hydraulic fluid. The cylinder has a closed chamber around it, to which oil under pressure is suppli... | 01/30/1979 |
| 4117764 | Vibration attenuating device A vibration attenuating device to be used in conjunction with reciprocating-motion type impact mechanisms having working and stop members that are axially movable relative towards or away from one another. The members define a pressure chamber therebetwee... | 10/03/1978 |
| 4088062 | Fluid pressure operated impact mechanism A fluid pressure operated impact mechanism of the type having a reciprocating working member guided for movement along an axis toward and away from a stop member, a pressure chamber between the working and stop members to receive a fluid pressure medium t... | 05/09/1978 |
