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 |
| 7370570 | Fluid pressure cylinder A fluid pressure cylinder can apply a fastening force to an axially movable reciprocating rod. A reciprocating rod 13 is mounted in a case main body 10 so as to be reciprocable in a forward direction and a backward direction, and two lock units 16 | 05/13/2008 |
| 7299739 | Hydraulic cylinder A fluid pressure cylinder has a piston rod 18 fixed to a piston 26 and projecting outside a cylinder body 23. A lock surface 43 inclining to a radial direction of the piston rod 18 is formed in an engagement member 31 provid... | 11/27/2007 |
| 7195197 | Techniques for controlling a fin with unlimited adjustment and no backlash A fin control assembly includes a housing, an arm configured to couple to a fin and to steer the fin relative to the housing, and a locking member disposed within the housing. The locking member is configured to (i) lock the arm in a substantially fixed state to inh... | 03/27/2007 |
| 7125058 | Locking device with solenoid release pin A locking device with a solenoid release actuator includes a housing, a plunger axially slidable within the housing, a biasing member for biasing the plunger in a first direction, one or more locking balls, and the locking balls disposed in an aperture in the housin... | 10/24/2006 |
| 7097011 | Park lock activated by fluid The present invention concerns a parking lock for combination with a service brake actuator for a vehicle, preferably a heavy road vehicle. The service brake actuator comprises a fluid actuated piston having a piston rod. The parking lock surrounds the piston rod of... | 08/29/2006 |
| 6902043 | Driveline vehicle parking brake actuator A driveline vehicle parking brake actuator including a reciprocable piston, a spring guide having a tubular distal portion telescopically received on the piston and a radial proximal portion which is telescopically supported within the housing by an annular wear gui... | 06/07/2005 |
| 6799502 | Spring brake cylinder with an emergency release device The invention relates to a spring brake cylinder with an emergency release device, comprising the following: a housing in which a spring-loaded piston can be moved axially with a piston rod, at least one spring-loaded spring, wherein the emergency release device com... | 10/05/2004 |
| 6226809 | Hydraulic lift cylinder assemblies An hydraulic bath seat lift has a hydraulic cylinder assembly comprising an inner cylinder fixed with the floor and an outer cylinder, which can be raised and lowered by supplying hydraulic fluid to the assembly. The outer cylinder supports a seat at the ... | 05/08/2001 |
| 5396831 | Hydraulic plunger replacement method and device A removable cartridge seal and dilatable collet retainer for a hydraulic plunger is provided to permit ready removal and replacement of the plunger and seal in a hydraulic intensifier device or the like.... | 03/14/1995 |
| 5361680 | Pressure-intensifying type fluid pressure cylinder In a pressure-intensifying type fluid pressure cylinder, an auxiliary cylinder chamber is provided outside a rod cover, a pressure intensifying piston is axially and slidably disposed on the outer peripheral portion of a piston rod in the auxiliary cylind... | 11/08/1994 |
| 5354710 | Method of manufacturing semiconductor devices using an adsorption enhancement layer A method of manufacturing semiconductor devices comprises the steps of preparing a semiconductor substrate having a surface and a natural oxide film on the surface, forming an adsorption enhancement layer on the surface of the semiconductor substrate, for... | 10/11/1994 |
| 5233912 | Piston for forcing liquid metal out of a casting cylinder A piston for forcing a liquid metal out of a casting cylinder of a die-casting press, having a mounting piece with an end surface and an outer peripheral surface; and a cap having an inner cover surface, an inner peripheral surface, and a free edge surfac... | 08/10/1993 |
| 5203250 | Fluid cylinder mechanism A fluid cylinder mechanism couplable to a vehicle and having a piston slidable within the cylinder, a rod couplable to an implement and shiftable within an opening in the piston, the rod being adapted to shift vertically within the piston a an implement r... | 04/20/1993 |
| 5094148 | Piston stem insert for a carpule based piston A piston stem insert to be received within a hollow receptacle that is molded at the interior of a carpule based piston, so that a piston stem may be easily attached to and detached from the piston by way of the insert. In a first embodiment of the invent... | 03/10/1992 |
| 5020418 | Piston lock for power cylinders A power cylinder of the type in which the piston may be locked to maintain the associated tool or clamp in a fixed position. A pair of guide rods extend in parallel spaced fashion through the bore of the cylinder from end to end of the cylinder and the pi... | 06/04/1991 |
| 5018434 | Self-adjusting servo mechanism for actuating a friction band assembly in a planetary gear set The present invention is directed to a self-adjusting servo mechanism (10). The servo pin (30) presented from the servo mechanism (10) will protract sufficiently to effect operative engagement of a friction band assembly (13) with a rotating member (18) i... | 05/28/1991 |
| 4989698 | Control device for a lockable gas spring The invention relates to a control device for a gas spring which can be locked as desired by displacement of a sliding control finger. Two axially elongated, diametrically opposed windows (14), at least one of which is larger at the end nearest to the gas... | 02/05/1991 |
| 4957193 | Actuating cylinder having mechanical advantage An actuating cylinder having a fluid pressure operated piston member connected by a friction member to a push rod to which a brake shoe, or the like, may be attached as the output member. A force transfer lever is arranged between the piston and push rod ... | 09/18/1990 |
| 4907491 | Extended-travel actuator with clamps on rod and cylinder end for clamping central rod The cylinder has a sealed back wall through which the rod passes. A piston assembly mounted on the rod between the back wall and a cylinder front end-piece contains a fluid-pressure-activated clamp. The front end-piece also has a clamp. By sequenced opera... | 03/13/1990 |
| 4865166 | Assembly and disassembly system with a spring retaining member for a brake actuation unit An assembly and disassembly system for a spring of a brake actuation unit, in particular for rail vehicles including a fluid pressure cylinder and a piston slidable in the cylinder. A cylindrical nut member is provided having a tubular portion extending o... | 09/12/1989 |
| 4848598 | Dispensing device A dispensing device of the hand-help pump type has an internal piston which is pulled up by a rod passing through the piston, which rod is moved by an actuator. When the contents of the piston are emptied, in order to attach a refill, a dog release mechan... | 07/18/1989 |
| 4833975 | Integrated manual brake device An integrated manual brake device on a brake actuation unit, particularly for rail vehicles, and it includes a hydraulic or pneumatic cylinder. The brake actuation unit contains a linkage setter including two parts displaceable relative to each other in a... | 05/30/1989 |
| 4811651 | Spring brake cylinder A spring brake assembly having a body portion in which a piston is mounted for reciprocal movement. A piston guide means engages a stem portion of the piston and an end of the body portion. A brake spring is caged between an inner surface of a face portio... | 03/14/1989 |
| 4793449 | Railraod truck braking system A railroad truck having at least four wheels comprising brakes for braking the wheels; a single enclosed air cylinder mounted on the truck; the air cylinder having first and second chambers; a conduit to supply service air pressure to the first chamber; t... | 12/27/1988 |
| 4785717 | Brake actuation unit with slack adjustment A brake actuation unit comprises a fluid pressure cylinder with a piston movable in the cylinder which has a central projection portion with a recess having axially spaced opposed coupling surfaces. The spindle is centrally arranged in respect to the pist... | 11/22/1988 |
| 4785718 | Spring brake cylinder A spring brake cylinder assembly in which a pushrod connectable to a brake assembly is extendable from an end of such cylinder housing the piston member. The spring brake cylinder further includes a clutch release mechanism for manually releasing the brak... | 11/22/1988 |
| 4781105 | Spring brake cylinder A spring brake cylinder assembly having a spring-biased piston positioned therein. A pushrod is engaged with the piston through a clutch, which clutch includes both a clutch control device and a clutch operating mechanism that can manually release a brake... | 11/01/1988 |
| 4777867 | Releasable spring ring device for a spring-operated brake actuator A device for discontinuing and automatically restoring the operational function of a spring brake actuator. The device includes a piston with a piston rod and a spring for actuating the piston and piston rod in a working direction for brake application at... | 10/18/1988 |
| 4723479 | Hydraulic tool system A system of hydraulic tools utilizing removably, replaceable and substantially interchangeable valve assemblies, fluid reservoirs and hydraulic driving mechanisms. The fluid reservoir maintains the hydraulic fluid under moderate pressure. The valve assemb... | 02/09/1988 |
| 4684074 | Fluid-operated ram A drive ram, particularly for a yarn winder, has the piston rod freely movable relative to both the piston and the ram cylinder in a first condition in which a locking washer is perpendicular to the longitudinal axis of the piston rod. Upon application of... | 08/04/1987 |
| 4569271 | Hydraulic boosters for vehicle hydraulic systems An hydraulic booster has a housing provided with a bore, an inlet connected to a source of pressure fluid, and an outlet connected to a reservoir for fluid, a boost piston being advanced in the bore in response to pressurization of a boost chamber, the bo... | 02/11/1986 |
| 4567977 | Delayed restraint release device for inflatable escape slides A delayed restraint releaseable device utilized to restrain and controllably release the lower end of an inflating escape slide at a predetermined pressure, orientation and time. The device combines two distinct restraint mechanisms into one combination u... | 02/04/1986 |
| 4564088 | Axial braking device A braking device for arresting an axial relative movement between a bearing, and a shaft slidably engaging the bearing and extending through a cylinder which is axially immovable to the bearing. The device comprises: an annular piston slidably received in... | 01/14/1986 |
| 4552056 | Manual release and automatic reset arrangement for spring-applied/air-released brake An automatic reset arrangement for a manual release mechanism in a spring-applied, air-released brake comprising a sleeve member having axially projecting fingers that slide axially within the bore of the spring piston push rod. The ends of the projecting... | 11/12/1985 |
| 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 |
| 4480531 | Mechanical quick-release mechanism for spring-loaded brake cylinders A manually operable quick-release mechanism for use with a spring-loaded brake cylinder including an energy-storing piston operable by fluid pressure to a brake release position with a ball type clutch for locking said piston and a piston rod in said brak... | 11/06/1984 |
| 4472995 | Spring-loaded brake cylinder A spring-loaded brake cylinder has a slideable braking piston one side of which is acted upon by a first spring in the braking direction and a second side acted upon by air under pressure in the release direction against the force of the spring. There is ... | 09/25/1984 |
| 4471944 | Telescopic jack A telescoping jack having a cylinder and a plurality of coaxial tubular elements mounted within the cylinder, the elements being movable between a retracted position where they are nested within the cylinder and an advanced position. Each pair of adjacent... | 09/18/1984 |
| 4470340 | Locking mechanism for fluid operated actuator An automatic mechanism is provided for locking the piston rod of a multi-position fluid operated linear actuator in its existing extreme axial position and to maintain such piston rod's position against unbiased forces acting on the piston rod, in the eve... | 09/11/1984 |
| 4457212 | Hydraulic ram A hydraulic ram for use in thrust-jacking of tunnel linings comprises a cylindrical outer member, a cylindrical inner member reciprocable within the outer member, and an extension member reciprocable within the inner member. A two-part clamping ring is pr... | 07/03/1984 |
