Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8056466 | Pneumatic actuator, in particular for valves The invention concerns pneumatic actuators for valves comprising a body closed by head flanges, two pistons moving in said body in opposite directions, an output shaft that turns actuated by the pistons, and a stop device on each head flange to limit the stroke of t... | 11/15/2011 |
| 7363848 | Rotating or pivoting device and connection module for a rotating or pivoting device The invention relates to a rotating or pivoting device (110) comprising a housing (12), at least one working piston (14) which is mounted in the housing and subjected to a pressure medium, and a pivoting part (20) which is rotatably mount... | 04/29/2008 |
| 6997148 | Engine valve actuator An engine valve actuator for an internal combustion engine is provided. The actuator includes a housing having an opening. An adjustment member is disposed in the housing and defines a fluid chamber having a chamber wall. A piston is also disposed in the opening. Th... | 02/14/2006 |
| 6966248 | Adjustable valve rod and pull tube guide for downhole pumps The guide has a barrel segment and a bushing segment. The barrel segment couples to the upper end of the pump barrel. The bushing segment has a bushing stop. The length of the guide is adjustable so as to vary the length of the bushing stop from the barrel. By varyi... | 11/22/2005 |
| 6708656 | Engine valve actuator An engine valve actuator for an internal combustion engine is provided. The engine valve actuator includes a housing having an opening. An adjustment member is disposed in the housing and defines a chamber. A piston is disposed in the opening of the housing and has ... | 03/23/2004 |
| 6505639 | Hygienic three way valve The invention pertains to a hygienic three way valve for dispensing medicinal, pharmaceutical and food products or other fluid materials which require the processing of fill products without contamination while providing a positive control over the the fi... | 01/14/2003 |
| 6484745 | Fill valve assembly A positive control fill valve for dispensing fillable materials which eliminates dripping, splashing, sloshing and contamination of fill materials is provided with a fluid activiated fill piston having a substantially cylindrical piston sealing head coope... | 11/26/2002 |
| 6481333 | Positioning device, capacity controller using positioning device, and speed changing device First and second pistons are provided in a body, the first piston is restricted by the body and the second piston, and the second piston is restricted by the body and a second piston restricting part. Thus, the first piston can be stopped at three positio... | 11/19/2002 |
| 6371439 | Device for adjusting the central position of the pistons and the angular position of the pinion in a valve driving actuator A device for adjusting the central position of the pistons and the angular position of the pinion in a valve driving actuator comprises a tubular body in which are tightly movably arranged a first and second pistons having opposite racks, meshing with a c... | 04/16/2002 |
| 6012903 | Positive-displacement liquid-metering pump with continuously variable output A piston-type positive-displacement liquid-metering pump with an output-control apparatus for varying the pump output volume per piston stroke by very minute amounts on a smoothly gradual and continuous basis, in which an actuator or actuation portion of ... | 01/11/2000 |
| 5761983 | Output shaft of booster An improvement of an output shaft of a booster is disclosed. An output shaft 23 is formed by a push rod 24 and an adjusting screw 25. The push rod 24 is formed with an axial bore 26 in its distal end, the axial bore including a portion 26b of a reduced di... | 06/09/1998 |
| 5713261 | Slack adjustable force transmitting cylinder A pressure actuated force transmitting cylinder includes a housing member having first and second elongated portions. An end cap closes one end of the housing in a fluid tight manner. A connection is formed through such first portion for communicating flu... | 02/03/1998 |
| 5626071 | Hydraulic ram with adjustable stop A hydraulic ram including a stop system which defines a piston stroke. The stop system may be adjusted and the set position of the stop member may be coarsely read from graduation of a scale member while an adjustment ring has a finely graduated scale.... | 05/06/1997 |
| 5609090 | Actuator with protective end cap A fluid-powered rotary actuator for providing rotary movement between first and second external members. The actuator includes a cylindrical body with first and second ends. The body is adapted for coupling to the first external member, and a shaft extend... | 03/11/1997 |
| 5477772 | Actuator with protective end cap A fluid-powered rotary actuator for providing rotary movement between first and second external members. The actuator includes a cylindrical body with first and second ends. The body is adapted for coupling to the first external member, and a shaft extend... | 12/26/1995 |
| 5437218 | Diaphragm pump having variable displacement Diasphragm pump having a delivery rate which can be continuously adjusted between a zero value and a maximum value, comprising: a continuously rotating eccentric drive member (6); a connecting rod (5) with a connecting-rod big end (11-14) fitted with a bearing... | 08/01/1995 |
| 5357844 | Run-up control for the pressure cheek in a drawing apparatus A run-up control for the pressure cheek in a drawing apparatus achieves stoppage times during the run-up phase by having a pressure cylinder with first and second pressure spaces as well as a control piston which is fixed in its position in the control cy... | 10/25/1994 |
| 5335583 | Stopper mounting structure for use on rodless cylinder In a rodless cylinder, a moving member which is moved along a cylinder body is reduced in height for the sake of compactness and stability. A stopper is mounted on a stopper support base, which is also reduced in height to preclude the possibilities of ob... | 08/09/1994 |
| 5322142 | Hydraulic auxiliary power steering This invention relates to a pressure turnoff device in the terminal positions of the steering deflection in an auxiliary power steering. In steering systems that reveal a working piston (2) that can be shifted in the steering housing, one inserts this tur... | 06/21/1994 |
| 5228380 | Linear drive A linear drive comprising a drive member adapted to be reciprocated axially in a housing between two end positions. Opposite to the former there is a wall on at least one axial side. There are means to reduce the impact in the end position, such means hav... | 07/20/1993 |
| 5190263 | Locking mechanism for an actuator A locking mechanism for an actuator prevents the unauthorized operation of the actuator and also permits a viewer to determine whether the actuator is in a locked open, locked closed or unlocked position. The invention utilizes a clear cover guard which i... | 03/02/1993 |
| 5181468 | Pretensioned jack for controlling the operating pressure between two rotary cylinders A device for controlling the operating pressure between the two rotary cylinders in a machine used for processing layers such as webs, ink films, or the like for instance on an offset printing machine. The device includes a pneumatic jack having an outlet... | 01/26/1993 |
| 5134923 | Linear to rotary movement valve actuator The invention is directed to a pneumatic or hydraulic rotational power drive particularly suited for a ball stopcock type valve, the power drive consisting of a power cylinder being located coaxially to the rotation axis of the cock plug, the piston rod s... | 08/04/1992 |
| 5102094 | Vacuumizer valve assembly An improved vacuumizer valve assembly is provided which permits precise, infinite valve adjustment from outside of a vacuumizer apparatus, thus eliminating the need to open the vacuumizer chamber during adjustment procedures. The valve assembly of the inv... | 04/07/1992 |
| 5086864 | Hydraulic auxiliary-power steering device The invention is concerned with a device that cuts off pressure in the final positions of the steering movement in an auxiliary-power steering device. In steering devices that have movable working pistons in the steering gear housing, this cut-off device ... | 02/11/1992 |
| 5065663 | Electropneumatic or electrohydraulic linear drive mechanism A linear drive mechanism has a combination of a drive cylinder, a drive rod stroke-limiting element, position sensors, a solenoid, and a terminal strip, together with internal wirings and hose connections. The drive mechanism can be arbitrarily arranged q... | 11/19/1991 |
| 5033518 | Fine adjustment for filling machine having piston differential pressure A filling machine wherein a lost motion mechanism is provided with a counteracting element to counteract forces between the driver and the filling unit to assure that the lost motion mechanism operates with lost motion. The counteracting element is provid... | 07/23/1991 |
| 4840257 | Brake adjusters A brake adjuster wherein a thrust block is axially slidable in a cylinder bore and rotatably connected to one of two screw threaded adjuster members which are themselves interconnected by a self-sustaining thread. In use a power spring acts on the thrust ... | 06/20/1989 |
| 4815293 | Springs for constant abutment push rod and master cylinder piston in brake booster assembly A vacuum brake booster and hydraulic master cylinder arrangement with lost-motion-eliminating abutment between the vacuum booster push rod and the master cylinder piston. The vacuum booster has an input rod, a valve, a power piston, and an adjustable leng... | 03/28/1989 |
| 4806079 | Apparatus for simultaneously pumping a plurality of liquids Apparatus for simultaneously pumping two or more different liquids to a spraying device has a pair of discrete diaphragm pumps for each liquid. The pumps of each pair are connected in parallel and operate alternatingly so that one pump delivers a metered ... | 02/21/1989 |
| 4736674 | Abutment arrangement and position detector for a piston and cylinder actuator The invention relates to an abutment arrangement for limiting the stroke of a piston and cylinder actuator. The abutment arrangement comprises an integrated detector which may be in the form of a proximity feeler screwed into a guard housing. The abutment... | 04/12/1988 |
| 4702098 | Redraw carriage assembly and slide mount Apparatus and method are provided for resiliently clamping a redraw cup (82) against a redraw die (34) in a crank and slide press (144) of the type having a redraw carriage assembly (12) that includes a redraw sleeve (62), and for slidably mounting the re... | 10/27/1987 |
| 4569378 | Filling machine with tandem-operated diaphragm filling units An improved filling machine with tandem-operated diaphragm filling units is disclosed. The filling machine comprises a plurality of individual filling units operated in common from a common drive bar. Each of the filling units includes a cylinder, a flexi... | 02/11/1986 |
| 4568058 | Dual stage hydraulic actuator for expanding gate valve A dual stage hydraulic actuator (9) for actuation of an expanding gate valve (10). The actuator is mountable to the valve housing and comprises a housing 40 which defines a piston chamber 41 and a primary piston (61) slidably received therein. An actuator... | 02/04/1986 |
| 4537293 | Hydraulic cylinder assemblies A drum brake hydraulic wheel cylinder assembly comprises a pair of piston assemblies and an abutment member. The piston assemblies are of the kind comprising an adjustable variable length tappet assembly having interengaged screw-threaded components. To e... | 08/27/1985 |
| 4493246 | Brake cylinder with two pistons A spring-applied, air-released parking/emergency brake is combined with an air-actuated service brake through a friction clutch between the parking/emergency brake piston and a first nut member that is threaded onto a screw rod of the service piston. The ... | 01/15/1985 |
| 4381099 | Faucet for frozen carbonated beverage machine An FCB-making machine is provided with an adjustable faucet that is energized by a pressurized fluid such as carbon dioxide or air, which is controlled by a momentary-contact switch-actuated three-way solenoid valve. Dispensing is started by depressing th... | 04/26/1983 |
| 4367674 | Actuator device An actuator device used with an engine-idle control system of an automobile provided with an air-conditioner, and is adapted so as to operate an operating rod in association with a throttle valve opening lever of an internal combustion engine. The actuato... | 01/11/1983 |
| 4363261 | Cylinder assembly and method of replacing seals and bearings A cylinder assembly comprises a cylinder having a bore, a bearing therein and an extension bore. A head on the cylinder removably mounts and retains a gland assembly including a piston rod seal and wiper. A piston rod is reciprocally mounted within the bo... | 12/14/1982 |
| 4358990 | Negative pressure booster A negative pressure booster wherein a brake master cylinder of an automobile is boosted and operated under negative pressure. The booster comprises a booster shell, a booster piston to divide the interior of the booster shell into a first and second actua... | 11/16/1982 |
