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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7775151 | Hydraulic lift structure In a hydraulic lift structure formed by arranging a hydraulic cylinder case internally provided with a hydraulic cylinder for moving up and down a working machine (a rotary power tiller) in an upper portion of a transmission case of a working vehicle, an oil reservo... | 08/17/2010 |
| 6702136 | Brake fluid reservoir cap assembly design The present invention is an improved reservoir cap for a braking fluid reservoir including a cylindrical skirt for surrounding an opening of the reservoir body, a disc portion having a hard stop formed unitarily with the cylindrical skirt for closing the ... | 03/09/2004 |
| 6588556 | Pressure medium cylinder with attached function block A pressure medium cylinder with a piston rod (1) extending out on one side has a cylinder floor (3), which closes off the cylinder tube (2) on the piston side with a fastening element (4), and a function block (5), placed upon the former, with function el... | 07/08/2003 |
| 6453545 | Compact inflatable device for applying localized pressure to turbine generator armature bars Radial pressure is applied to a turbine generator armature bar using a simple hand held device that can be readily manipulated by a single human operator. A retainer platform has two wedge shaped portions with handles, and by the operator sliding the wedg... | 09/24/2002 |
| 6026643 | Master cylinder To provide a hydraulic master cylinder with inlet ports and outlet ports arranged in an angle to each other wherein the outlet ports can be on either side of the housing without the need of two different casts, the master cylinder according to the inventi... | 02/22/2000 |
| 5960696 | Hydraulic cylinder with press-fitted pipe It is intended to dispense with the pipe welding work, thereby improve the pipe mounting performance and prevent contamination which results from welding, and elimination the waste of oil. A spigot portion 34 is mounted upright integrally in the center of the ... | 10/05/1999 |
| 5727440 | Gas cylinder element A gas spring element or gas cylinder element, particularly suitable for presses for non-cutting forming, including a closed non-compressible fluid system which includes the ring space between the piston or as the case may be piston rod and the cylinder or... | 03/17/1998 |
| 5497621 | Plastic reservoir A plastic reservoir adapted for use with a hydraulic power pack. The reservoir includes a plastic body and a substantially plastic mounting ring which is joined to the plastic body of the reservoir. The mounting ring includes a metal reinforcing ring whic... | 03/12/1996 |
| 5144801 | Electro-hydraulic actuator system An electro-hydraulic actuator having an electric motor disposed in a hydraulic fluid reservoir and connected to drive a hydraulic fluid pump. The actuator includes a piston rod which extends or retracts as a piston is hydraulically driven in a cylinder. A... | 09/08/1992 |
| 5086691 | Gas compression device having isolated compression and lubrication chambers A high-performance, robust gas-compression device of long-term reliability is adapted in particular for storing nitrogen gas under compression, and includes a substantially cylindrical body (1), a piston (4) partially projecting into the gas-storage chamb... | 02/11/1992 |
| 5038669 | RAM piston with internal reservoir and check valve A double-cylinder construction which can be used not only in large-sized compression molding machines but also in small-sized or medium-sized compression molding machines. In the double-cylinder construction of the present invention, a ram slidably fitted... | 08/13/1991 |
| 5015000 | Floating seal arrangement A rod seal for a linear hydraulic or pneumatic actuator cylinder includes a seal ring that has a bore that closely matches the diameter of the rods, proximal and distal cylindrical portions and a central annular flange. A seat in the actuator cylinder dis... | 05/14/1991 |
| 5014882 | Pivot-action portioning apparatus and method A volumetric apparatus for portioning fluidic material into fractions of predetermined size includes a housing having an inlet and an outlet, and a piston movable in the housing and defining a product portioning chamber and a compression chamber. Fluidic ... | 05/14/1991 |
| 4924673 | Master cylinder with parallel-bore reservoir A master cylinder assembly especially adapted for mounting in the passenger compartment of a motor vehicle in association with the clutch pedal assembly of the motor vehicle. The unit is permanently sealed and is non-serviceable so that no fluid leakage o... | 05/15/1990 |
| 4893472 | Collapsible tubular diaphragm for master cylinder reservoir A hydraulic master cylinder assembly of the type including a reservoir in which a diaphragm is disposed to divide the reservoir chamber into a hydraulic fluid chamber outside of the diaphragm and in communication with the pressure chamber of the master cy... | 01/16/1990 |
| 4893473 | Reservoir-formed shoulder stop for makeup fluid valve actuation in pull-type master cylinder A fabricated master cylinder having a reservoir part and in interlocked cylinder part defining a cylinder bore and which a slidable piston is supported. The reservoir part that extends into the cylinder bore defines a shoulder that cooperates with a recup... | 01/16/1990 |
| 4858439 | Device for varying a stroke A stroke variable device comprising a large diameter cylinder and a small diameter cylinder which are interconnected to each other. A large diameter piston and a small diameter piston are slidably inserted into the large diameter cylinder and the small di... | 08/22/1989 |
| 4691902 | Self-lubricating die cylinder A self-lubricating die cylinder assembly is provided containing a cylinder, piston, expansion reservoir and working chamber. A lubricating oil recirculation means is provided to transport oil between the working chamber and the expansion reservoir during ... | 09/08/1987 |
| 4548123 | Oscillator An oscillator is proposed which comprises a pair of cylinders having a common, circular-cylindrical outer wall (100) and two sealingly guided pistons (120, 122) each having one piston rod (121, 123), which are likewise guided in a sealing manner to the ou... | 10/22/1985 |
| 4455708 | Door closer having a braking mechanism comprising an elastomeric bag A door closer comprising at the end of one of two pivotally interconnected arms a closing device whose housing encloses a cylindrical piston driven by the arm through a rack-and-pinion system. On each side of this piston a return spring and a bag, filled ... | 06/26/1984 |
| 4249452 | Hydraulic brake booster reserve system A hydraulic brake booster provides a housing within which a spool valve is slidably mounted. The housing forms a pressure chamber and the spool valve is movable from a first position venting the pressure chamber to a second position, communicating the pre... | 02/10/1981 |
| 4137824 | Remote shifter for vehicle transmissions Primary switches in bus cab, for instance, activate contacts in secondary switch group in rear transmission compartment to energize solenoids selectively pressurizing opposed cylinders to drive transmission shift operation to various positions.... | 02/06/1979 |
| 4075931 | Lift-jack fluid motor for hydraulic lift trucks An expanding chamber hydraulic motor venting through a working member reduces the motor/stroke-limiting venting valve assembly to three simple components: a cup-shaped cylinder, an annular gasket at the open end of the cylinder, and undersize piston suffi... | 02/28/1978 |
| 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 |
| 3975986 | Weep hole for hydraulic jack A laser formed hole is used as a "weep" hole in a hydraulic jack to limit the power stroke of the ram thereby permitting the use of a urethane packing on the ram instead of the usual leather packing.... | 08/24/1976 |
