Class 416/106 - With movement restraining means (i.e., damping)

Subclass of Class 416 - Fluid reaction surfaces (i.e., impellers)
Definition: Apparatus provided with means to limit the extent or reduce
No. of patents: 24
Last issue date: 10/27/2009

Number	Title	Issue Date
7607892	Rotorcraft rotor with blades hinged in flap and in lag The invention relates to a rotorcraft rotor comprising a hub and at least two blades hinged relative to the hub about respective pitch axes and about respective flap axes, and about respective lag axes; each blade is secured to a respective pitch lever; the rotor in...	10/27/2009
7360994	Method of controlling vibration damping in a helicopter, and apparatus implementing the method The present invention relates to a method of controlling a drag damper for a helicopter blade under all operating configurations of the helicopter, the method consisting in: a) measuring the elongation of the damper;	04/22/2008
7281896	Fan and impeller thereof An impeller includes a hub and at least one blade. In this case, the hub has at least one balancing portion disposed on hub and arranged with respect to a center of the hub. The balancing portion has at least one corner. The blades are disposed around the hub. In ad...	10/16/2007
7137624	Fluid-elastomeric damper assembly including internal pumping mechanism A fluid-elastomeric damper assembly operable for damping relative motion between a first structure and a second structure including a housing structure grounded to the first structure and a plurality of elastomer seals coupled to the housing structure, the housing s...	11/21/2006
6926500	Fluid inertia drag damper for rotary wing aircraft rotor A drag damper for use on a rotary-wing aircraft rotor comprises a body defining two variable volume chambers linked by a piston. The chambers filled with fluid in the damper are connected by a restrictor port in the piston or between the latter and the body, and via...	08/09/2005
6827553	Flexbeam damper assembly having transition shim clamp device A damper assembly including a spherical elastomer bearing member, wherein the spherical elastomer bearing member is operable for accommodating relative motion and/or vibration, and a flat elastomer bearing member, wherein the flat elastomer bearing member is operabl...	12/07/2004
6676074	Dual piston drag damper for rotary-wing aircraft rotor A drag damper for use on a rotary wing aircraft rotor comprises a body defining two variable volume chambers linked by a piston. The chambers are filled with fluid and are connected by a restriction port (35) and by a channel (32) of larger cross-section ...	01/13/2004
6398496	Minimizing wind forces on helicopter blades Helicopter blades each have a piston connected to it. The pistons are movable within a cylinder between innermost and outermost positions. The hydraulic fluid of each cylinder is connected to other cylinders by a hydraulic tube or through a manifold. A dr...	06/04/2002
6050778	Semi-articulated rotor system A semi-articulated stiff-in-plane (SASTIP) rotor hub is provided. The hub includes a cylindrical composite shell (12). A plurality of flexure mount assemblies (16) are positioned around the periphery of the hub shell. Each flexure mount assembly includes ...	04/18/2000
6045328	Fluid damper including flexible damping plate A fluid and elastomer damper includes a first and second members and an elastomer section flexibly mounting the second member to the first member and allowing lateral movement therebetween. The elastomer section includes an inner wall forming a portion of...	04/04/2000
5636970	Device for damping the drag of the blades of a rotor The device comprises, between two blades and their members linking them to the hub, three levers articulated by ball joints to the members and to the hub, the two levers pivoting on the third one about axes of pivoting parallel to each other and perpendic...	06/10/1997
5628620	Main rotor system for helicopters A main rotor is provided for use in a rotary winged model aircraft. The main rotor includes a rotor hub assembly rotatable about a vertical axis and at least two main rotor blades. Each of the main rotor blades extends in a radial direction from the rotor...	05/13/1997
5407325	Rotor head for rotary wing aircraft A rotor head for a rotary wing aircraft having a plurality of rotor blades, such that each blade is coupled to the hub by an attachment assembly. The attachment assembly includes a thrust bearing device attached to the hub for allowing angular oscillation...	04/18/1995
5372478	Helicopter rotor damper A hollow rotor hub is provided at the top of the rotor shaft for a multi-bladed helicopter. The blades being mounted to the rotor hub on spherical elastomeric bearings which provide for coincident rotor blade hinges for blade pitch, flap and lead-lag moti...	12/13/1994
5267833	Gyrocraft rotor hub body Gyrocraft rotor hub body (1) in which each blade (2) is linked to the body (1) by articulations and linking members the body includes two strong elements (7, 8) whose planes are substantially parallel to each other and perpendicular to the axis of the mas...	12/07/1993
5266005	Rotor head for rotary wing aircraft A rotor head for a rotary wing aircraft rotor blades, such that each blade is coupled to the hub by an attachment assembly. The attachment assembly includes a thrust bearing attached to the hub for allowing angular oscillations, and drag damping device co...	11/30/1993
5219430	Hydraulic damper and elastic-return strut comprising such a damper The hydraulic damper according to the invention has at least one restricted communication passage (47) between its two working chambers (8, 9) whose cross section is controlled by a viscous restriction valve (51) positioned via a control pressure of a flu...	06/15/1993
5116201	Adjustment means for helicopter rotor blade viscous damper A viscous damper for a helicopter rotor blade having a stator member and a rotor member each having a plurality of flanges of different diameter defining cylindrical internal and external shear surfaces, respectfully, and a shear gap therebetween, one sta...	05/26/1992
5116209	Device of retractable stops for rotor blades of giroplanes, and rotor head including such a device A device of retractable stops for the blades of articulated rotors for giroplanes, which includes a stationary stop 20 with a finger 22 radially converging towards the exterior and externally radially protruding on the external spar 9 of the articulation ...	05/26/1992
4808075	Helicopter rotor A helicopter rotor on which each blade is connected in articulated manner to a center hub by means of a fork, the vertical plane movement of which is limited, below a given speed of the rotor, by a pair of limit rocker arms located between the hub and a r...	02/28/1989
4695226	Helicopter rotor backup damper system In a system having many unequal-area dampers (16) and a common main accumulator (34) for providing positive hydraulic pressure thereto, a shutoff valve (64) and a backup accumulator (62) are provided for each damper (16). In the event of a loss of pressur...	09/22/1987
4551067	Helicopter rotor A rotor for helicopters, in which a central hub supports a plurality of radial blades connected thereto, each of which blade is provided with a surface rigidly connected to it and able to cooperate with respective abutment elements supported by the hub an...	11/05/1985
4241814	Mechanical-hydraulic damper for a load subject to shocks and vibrations A mechanical-hydraulic damper for a load which is subject to shocks and vibrations, comprising a co-operating pair of elements, the first of the pair of elements being mounted in a body for relative axial movement in relation to the body and the second of...	12/30/1980
4084668	Redundant damper seals A cylinder-and-piston type hydraulic damper has spaced dual seals on its piston rods to provide annular cavities between seals. A fluid leakage line connects said cavities to the closed reservoir of a fluid leakage indicator which consists of a cylinder c...	04/18/1978

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Class 416/106 - With movement restraining means (i.e., damping)