Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7237694 | Food metering and dispensing device A pump apparatus for an adjustable metering and dispensing pump apparatus for food products including a product piston moving in a product cylinder, the product cylinder being connected to a food hopper and a dispensing nozzle. The pump apparatus also includes a cyl... | 07/03/2007 |
| 7017469 | Metering device A metering device of the type in which a shuttle moves axially within a chamber between two terminal positions, with the chamber having fluid inlet and outlet at each end so that fluid may enter through one end to move the shuttle to cause fluid to be ejected throug... | 03/28/2006 |
| 6925719 | Powered coping saw An elongate, cylindrical hand-held powered coping saw adapted for making thin cuts of short length, such as for cutting individual dies from a full arch dental model generally includes a blade assembly, a housing, a rotary motor having a drive shaft, a piston for dr... | 08/09/2005 |
| 6247332 | Gas driven mechanical oscillator and method A gas driven oscillator (10) comprising an engine (11) having a cylinder (12) and a pair of expansion chambers (13, 14) on either side of a floating piston (15) adapted to reciprocate within the cylinder (12). The piston (15) is mounted on a piston rod (1... | 06/19/2001 |
| 6067796 | Gas driven mechanical oscillator and method A gas driven oscillator (10) comprising an engine (11) having a cylinder (12) and a pair of expansion chambers (13, 14) on either side of a floating piston (15) adapted to reciprocate within the cylinder (12). The piston (15) is mounted on a piston rod (1... | 05/30/2000 |
| 5865040 | Gas driven mechanical oscillator and method A gas driven oscillator (10) comprising an engine (11) having a cylinder (12) and a pair of expansion chambers (13, 14) on either side of a floating piston (15) adapted to reciprocate within the cylinder (12). The piston (15) is mounted on a piston rod (1... | 02/02/1999 |
| 5765374 | Gas driven mechanical oscillator and method A gas driven oscillator (10) comprising an engine (11) having a cylinder (12) and a pair of expansion chambers (13, 14) on either side of a floating piston (15) adapted to reciprocate within the cylinder (12). The piston (15) is mounted on a piston rod (1... | 06/16/1998 |
| 5669281 | Method and machine for altering the striking stroke of a percussive machine moved by a pressurized incompressible fluid Method and apparatus for controlling a percussive machine by determining, during the phase of rebound of a piston following impact, the existence of an instantaneous flow rate of fluid flowing from a top chamber toward the high-pressure fluid feed circuit... | 09/23/1997 |
| 5152211 | In-line hydraulic dashpot An in-line hydraulic dashpot is disclosed that effectively decelerates the iston of a power cylinder by controllably choking off the oil which is providing pressure to the piston. The in-line hydraulic dashpot of the invention includes a valve spool member... | 10/06/1992 |
| 5092744 | Intensifier An intensifier for delivering ultra high pressure water to a cutting head of a water jet cutting apparatus. The intensifier has a power piston and cylinder assembly connected to piston members extended into pumping chambers in housing located at opposite ... | 03/03/1992 |
| 5044254 | Reciprocating air motor A vibration cancellation device is provided for an air motor with a reciprocating drive piston. The device consists of an anti-phase piston which is axially aligned with the drive piston and reciprocates in the opposite direction of the drive piston. In o... | 09/03/1991 |
| 4951757 | Hydraulic striking device with impact frequency control In the hydraulic breaker according to the present invention, oil pressure at a fixed value always flows in the circuit at a low pressure side whenever the piston is raised or lowered, to prevent the need for an accumulator in the circuit at the low pressu... | 08/28/1990 |
| 4889034 | Automatic reciprocator with manifold and sleeve valve A pneumatic reciprocator includes a cylindrical air cylinder concentrically mounted within a cylindrical manifold. A cylindrical sleeve valve is concentrically mounted for movement along the manifold by a pair of spaced O rings. Two sets of circumferentia... | 12/26/1989 |
| 4873912 | Hydraulic driving arrangement A hydraulic drive system for a machine element performing in one work cycle a sequence of motions comprising a rapid feed motion, a working stroke under load and an oppositely directed rapid-return motion. The drive element includes a hydraulic cylinder h... | 10/17/1989 |
| 4817737 | Hydraulic striking device with impact frequency control In the hydraulic breaker according to the present invention, oil pressure at a fixed value always flows in the circuit at a low pressure side whenever the piston is raised or lowered, to prevent the need for an accumulator in the circuit at the low pressu... | 04/04/1989 |
| 4794843 | Hydraulic valve for controlling single-acting cylinder A hydraulic control valve for a single-acting cylinder includes a valve housing having a cylindrical valve bore. A supply port present in the valve housing is in communication with the valve bore, as is a discharge port and a delivery port. A valve pin is... | 01/03/1989 |
| 4501119 | Pump jack A pump jack of the type comprising a rocker arm pivotably mounted intermediate its ends on a support member, said rocker arm being divided by said pivot mounting into a sucker-rod limb and a drive limb wherein the improvement comprises a pneumatic motor p... | 02/26/1985 |
| 4480525 | Control device for forward and backward travel of automatic _pneumatic percussion boring devices A control device for working cycles of a self-propelled pneumatic boring device with a non-rotatable axially displaceable impact piston controllable by control edges of a control sleeve supported axially non-displaceably but rotatably and at its front end... | 11/06/1984 |
| 4430924 | Petroleum pumping unit A petroleum pumping unit which is especially suitable for use in remote oil fields and under unpredictable pumping conditions is disclosed. The petroleum pumping unit of the present invention, which is easily movable between a folded, collapsed position f... | 02/14/1984 |
| 4426912 | Apparatus for the continuous adjustment of a jack piston stroke Apparatus for the continuous adjustment of the stroke amplitude of the piston of a jack, the latter having a control member of which at least part is in the form of a rod, which is movable in rotation and in translation and cooperates with the said piston... | 01/24/1984 |
| 4284147 | Control device for the forward movement and rearward movement of pneumatic ram boring devices Control device for the forward movement and rearward movement of self-driven pneumatic ram boring devices with an impact piston which is axially displaceable between two abutments in a tubular housing, with the axial forward movement and rearward movement... | 08/18/1981 |
| 4278135 | Variable volume pneumatic drill A Pneumatic impact drilling tool, particularly useful as a downhole pneumatic drill, includes a housing structure adapted to be connected to a string of drill pipe and supplied with compressed air therethrough. A hammer piston reciprocates in the housing ... | 07/14/1981 |
| 4242940 | Fluid operated control device A fluid operated control device which co-operates with reciprocating means, such as a pneumatically driven shaft. The device includes a main cylinder and piston backed at each end by valves which each include auxiliary cylinders and pistons. The valves pr... | 01/06/1981 |
| 4196780 | Hydraulic percussion drill A percussion drill comprising a cylinder housing, a striker piston slidably accommodated within said housing, a shank rod slidably mounted within said housing, said shank rod being adapted to be struck by said striker piston, a first chamber having a smal... | 04/08/1980 |
| 4176586 | Piston and cylinder device A piston and cylinder device with a piston mounted for reciprocating movement in the cylinder has on the outside of the cylinder an elongated mounting element comprising two guiding members on each of which a limit switch is mounted for positioning longit... | 12/04/1979 |
| 4086968 | Pile driver In a pile driving hammer including a striker elevatable on guides by fluid pressure delivered to an operating fluid cylinder, and capable of being dropped to deliver a pile driving blow by exhausting fluid from the cylinder, a control system for the cylin... | 05/02/1978 |
| 4062411 | Hydraulic percussion tool with impact blow and frequency control A hydraulic percussion tool for developing repeated impact blows for rock drilling and other high force applications is characterized by a piston hammer reciprocably disposed in a cylinder bore and a tubular valve member coaxial with and actuated by the h... | 12/13/1977 |
| 4043709 | Adjustable stop assembly In a liquid product measuring pump driven by an air motor having air valve controls for reversing the reciprocating motion of the air motor at the end of the stroke for controlling the liquid product measuring, an adjustable stop assembly including a quic... | 08/23/1977 |
| 4031812 | Hydraulic vibrator for actuator drive As a drive in metal-cutting machines used for vibration cutting a hydraulic vibrator is proposed, which comprises a differential piston and a spring-balanced slide valve, which are made and arranged so as to ensure reciprocal successive communication betw... | 06/28/1977 |
| 4016941 | Hand-size fluid-powered tool reciprocator A portable and high-speed tool reciprocator for small tools, such as files, cutters, burnishing and polishing stones, leathers and the like, of a size easily held in one hand of an operator; fluid driven, preferably by a pneumatic fluid, the length of the... | 04/12/1977 |
| 3995700 | Hydraulic rock drill system In a hydraulic percussion rock drill the operation of the working fluid distributing valve is controlled to effect a variation in percussive blow energy and blow frequency by varying the piston hammer stroke. Actuation of the distributing valve is control... | 12/07/1976 |
