Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7213734 | Pneumatic tool drive system The invention relates to a pneumatic tool drive system, comprising a portable pressure source, a valve assembly, a regulating assembly, and a pneumatic assembly. The pneumatic assembly can be any conventional pneumatic device. The pneumatic assembly may be a pneumat... | 05/08/2007 |
| 7207259 | Actuator for actuating onboard devices on a sailboat An actuator (100) for actuating an onboard device (200) on a sailboat (300), comprises: a piston (2) slidably mounted within a cylinder (1) and movable between a first operating position, in which the piston is at a first end porti... | 04/24/2007 |
| 7198116 | Wholly air-controlled impact mechanism for high-speed energy-accumulating pneumatic wrench A wholly air-controlled impact mechanism invented for creating a more compact and powerful pneumatic wrench comprises a flying hammer, a pressure impulse generator and a pressure container containing the hammer and the generator. The main part of the flying hammer i... | 04/03/2007 |
| 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 |
| 7131451 | Apparatus for controlling and metering fluid flow A device for metering and controlling fluid flow includes a variable orifice and is configured to use a pressure sensor. The device includes a fluid flow conduit having at least one planar inner wall that extends along a portion of the fluid flow conduit length, and... | 11/07/2006 |
| 6477936 | Actuation arrangement for displaceable components on vehicles An actuation arrangement for displaced components on vehicles, particularly trunk lids, convertible tops, engine hoods or the like, includes at least one supply line for the pressurized medium and one essentially non-pressure connection line to a reservoi... | 11/12/2002 |
| 6266960 | Hydraulic control for a quick coupler Earthmoving machines are often provided with quick coupling devices that allow them to change work implements in a relatively rapid fashion when compared to changing conventionally mounted implements. A locking system between the machine linkage and the i... | 07/31/2001 |
| 5724878 | Hydraulic operating mechanism for a convertible top In a hydraulic operating mechanism for a convertible top, a pressure sensor (12) is incorporated into a common pressure circuit (P) of the hydraulic cylinders (1 through 4) and connected with a control unit which is connected to the switching elements (V1... | 03/10/1998 |
| 5365827 | Cylinder apparatus and method of controlling same A cylinder apparatus and a method of controlling the same allow an object to be moved at high speed and provide a decelerating force that can be changed with ease in conformity with the type of object. The apparatus includes a cylinder, a piston, an air s... | 11/22/1994 |
| 5170627 | Gas cylinder control system A gas cylinder control system for use with machine systems such as die stamping systems that includes at least one gaseous fluid cylinder associated with the machine system, gaseous intensifier control cylinder normally operated in timed relation to the g... | 12/15/1992 |
| 4939981 | Hydraulic servo cylinder device for controlling continuously variable speed transmission A hydraulic servo cylinder device for controlling a speed reduction ratio or clutch operation in a continuously variable transmission comprises cylinder and a piston slidably fitted in a cylinder chamber of the cylinder. The cylinder chamber is divided by... | 07/10/1990 |
| 4932311 | Fluid apparatus A fluid apparatus includes a pneumatic cylinder having a main body, a piston, and a hollow rod. A ball screw shaft engaged with a ball nut fixed to the piston is rotatably and axially unmovably mounted in the cylinder and extends in the hollow rod. A magn... | 06/12/1990 |
| 4836089 | Series spool pressure regulator arrangement for a double-acting hydraulic actuator A regulator arrangement (14) for a servo system (10) having a first stage valve spool piston (44) for developing a primary operational fluid (Pc) and a second stage valve spool piston (70) for developing secondary operational fluid Pcr | 06/06/1989 |
| 4825747 | Method and device for detecting a fluid flow rate A method and device are provided for detecting a fluid flow rate, said device comprising a body in which is formed a passage for the fluid, said passage comprising at least two cross sections of different values, a piston having two faces cooperating with... | 05/02/1989 |
| 4601349 | Hydraulic pile driver A hydraulic pile driver including a housing having an impact weight mounted therein for reciprocating movement, the impact weight being fastened to a piston movable in a cylinder, a supply source for liquid under pressure, a supply conduit communicating w... | 07/22/1986 |
| 4559863 | Valve for a hydraulic ram A spool valve for use in a hydraulic ram includes a piston journalled for axial movement within a cylinder under the influence of a fluid fed under pressure to the cylinder. The spool valve is journalled within a valve block closing an end of the cylinder... | 12/24/1985 |
| 4552227 | 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... | 11/12/1985 |
| 4532853 | Fluid-powered actuators An actuator output member (11) is angularly deflectable by two opposed, tangentially movable, pressure transmitting members (7, 8), each responsive to the pressure drop developed across two respective flow restrictors (1, 2) serially connected in a fluid ... | 08/06/1985 |
| 4512417 | Hydraulic reciprocating device This invention pertains to a hydraulic reciprocating device having a housing and a piston in the housing. The piston has a first and second surface, and a means for intermittently communicating the first surface of the piston with a hydraulic pressure sou... | 04/23/1985 |
| 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 |
| 4465497 | Pneumatic cyclic event timing actuator and control circuit for use with air blast filter cleaning and bulk material bin blasting systems A cyclic or periodic event timing system for use in conjunction with a pressure fluid control circuit includes a cylinder and piston type actuator comprising a differential area piston which is exposed to fluid pressure from a flow conduit on opposite sid... | 08/14/1984 |
| 4380901 | Hydraulic percussion machine A hydraulic percussion machine, comprising a body carrying hydraulic passages and valves, and having a gas-filled, hydraulic pressure accumulator for storing the stroke energy which accelerates a piston to strike against a tool. The percussion machine has... | 04/26/1983 |
| 4363258 | Hydraulic impactor An all-hydraulic impactor for percussion tools and the like embodying an oil accumulator and an annular sleeve valve. Hydraulic fluid is initially supplied to the accumulator at full supply pressure and is then charged, for example, to three times the sup... | 12/14/1982 |
| 4344353 | Hammer A hammer or impactor apparatus including improved motive fluid means cooperable with spring bias means to reciprocably drive a hammer element and an improved process of hammer cycling achieved thereby.... | 08/17/1982 |
| 4295411 | Impactor An impactor apparatus including novel means for actuation of a motive fluid flow control valve or comparable motive fluid control means.... | 10/20/1981 |
| 4253539 | Device for generating acoustic waves in a fluid by implosion Device for generating acoustic waves by implosion in a fluid medium comprising fluid-operated means to move a piston, having one end face in contact with said fluid, from a retracted position in the enclosure to a spaced apart position of maximum extensio... | 03/03/1981 |
| 4222309 | Hydraulic power system A method of operating an hydraulic power system having a piston with opposing piston heads reciprocally mounted in opposing piston chambers, the piston being directionally responsive to a pair of control valves adapted to be sequentially opened and closed... | 09/16/1980 |
| 4096785 | Elastic column of adjustable length A column including a cylinder, a piston axially slidable in the cylinder cavity, a piston rod axially projecting from the cylinder, and a valve permitting selective communication between the two compartments of the cylinder cavity separated by the piston ... | 06/27/1978 |
| 4096784 | Hydraulic power system An hydraulic power system comprising a dual acting work piston adapted to be operatively connected to an external mass to be moved, the piston being instantly directionally responsive to a pair of control valves adapted to be sequentially opened and close... | 06/27/1978 |
| 4080871 | Pressure medium servo motor, especially for servo steering systems A pressure medium servo-motor, especially for servo-steering systems, in which a working piston operating in a working cylinder is provided with a piston pressure surface actuatable by the pressure in one working pressure chamber of the working cylinder f... | 03/28/1978 |
| 4062268 | Fluid operable hammer A hammer and more particularly a fluid operable hammer wherein alternating impetus provided by pressurized liquid and gas means actuates a reciprocable hammer piston to generate repetitive impact loads.... | 12/13/1977 |
| 4036108 | Pressure fluid operated percussion tools In a percussion tool a means is provided for delaying the manifestation, on a valve means sensitive to such change in pressure, of a change in pressure of the fluid applied to the hammer piston at one end thereof and which drives such hammer piston in its... | 07/19/1977 |
| 4033250 | Pneumatic buffering system A pneumatically buffered drive system is provided which quickly moves a movable member, such as a press safety curtain or press bolster, a predetermined length in three sequential speed stages to prevent maximum acceleration from occurring at the end of t... | 07/05/1977 |
| 4011795 | Impact tool A hydraulic impact tool wherein hydraulic power is used to lift a ram against a bias to store energy and wherein the ram then is permitted to accelerate toward an impliment to which it imparts energy upon impact. A reciprocating cylindrical sleeve slidabl... | 03/15/1977 |
