FORM-2
THE PATENTS ACT, 1970 (39 of 1970)
COMPLETE SPECIFICATION
(Section 10, rule 13)
CABLE OPERATED PULL DOWN TYPE SWASHPLATE ASSEMBLY WITH NYLON FIBER BALL FOR HELICOPTERS
fAME OF APPLICANTS :
PRADIP SHIVAJI MOHITE PADMAVATI PRADIP MOHITE
Residing at
At./Po. - Wangi, Tal. - Kadegaon, Dist. - Sangli, PIN - 415305,
Maharashtra, India.

FIELD OF THE INVENTION :
The present invention relates to the swashplate of rotorcraft rotors, particularly it is relates to a rotor of helicopter. More particularly, this invention is leads to the control of a helicopter through redundant channels leading to a swashplate.
BACKGROUND OF THE INVENTION :
The swashplate of helicopter is typically mounted about a rotor shaft and the assembly includes two rings connected by a series of bearings with one ring is stationary and the other ring connected to rotor hub (rotating). Rotating ring is connected to rotor hub by a pivoted link called as scissors, with a static ring similarly connected to airframe. During working a rotating swashplate rotates relative the stationary swashplate. Apart from rotary motion, the stationary and rotating swashplate otherwise move as unitary component, control rods of main rotor blades are connected to lugs formed on the rotating swashplate and operate to transfer loads between the swashplate and the main rotor blades.
The main servos extend between and attach to the stationary swashplate and the aircraft fuselage, displacement of the servos results in corresponding displacement of the stationary swashplate. Thus, by actuating selected servos collective and cyclic commands are transferred to the rotor head and vertical and / or tilting displacement of the stationary and rotating swashplate. Collective control is achieved by translating the swash plate assembly up and down with respect to the rotor shaft and cyclic control is achieved by tilting the swash plate relative to the rotor shaft.
The stationary ring is typically mounted about the rotor shaft through a spherical ball joint that allows for tilt of the swashplate assembly, with the standpipe surrounding the rotor shaft allowing translation of the swashplate assembly. The pitch links connect the rotating ring of the swash plate assembly to the pitch or control arms of the rotor blades. The stationary swashplate assembly of the swashplate assembly is positioned by servos which are actuated in response to the pilot's control signals. Thus, when the pilot inputs a control command, the stationary swashplate assembly to be raised, lowered or tilted and the rotating swashplate assembly of the swashplate assembly follows to a collectively or cyclically position the rotor disc.

PRIOR ART:
According to prior art it is observed that the swashplate mechanism of existing helicopter having metallic ball supporting swashplate during its tilting, and the actuating links are a metal rods which operated against gravity by push up type force.
It is observed that there is need of development of some mechanism which replace the metallic ball by some other material to give less wear and smooth operation with more reliability, and replacing rigid metal rod link by flexible link which are more stronger for the same dimensions and actuating force assisted by the gravity for ease operation.
OBJECTIVES OF THE INVENTION :
The objective of the invention is to provide a mechanism which operate swashplate by pull down type force, rather than the push up type force of existing swashplate mechanism.
Another objective of this invention is to provide cable type link to operate swashplate, by replacing the metal rod link of existing system.
Yet another objective of this invention is to provide a nylon material fiber ball to swashplate assembly, instead of metallic ball of existing swashplate assembly system.
SUMMARY OF INVENTION :
According to this invention there is provided a nylon material fiber ball on which swashplate is tilted which reduces the metal friction and gives smooth operation and long lasting part with more reliability. Also in this invention, a cable is used as a link which is stronger than the same length of rod, to reduce the wear of rod link at joint and to enhance the flexibility of the operation of link. In addition to this, the said invention provided a pull down type actuating cable link instead of push up type rod link, thus actuating force is assisted by the gravity, and gives more stronger and flexible link for same dimensions.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS :
In the figure 1, the number indicates.
Reference numeral 1, relates to Nylon Fiber Ball
Reference numeral 2, relates to Swashplate Cable Stopper Rods
Reference numeral 3, relates to Bearing
Reference numeral 4, relates to Swashplate Supporting Clamp
Reference numeral 5, relates to Control Cable Hole
Reference numeral 6, relates to Half
Reference numeral 7, relates to Stapling Rod
Reference numeral 8, relates to Wire Rope Cable

DESCRIPTION :
This invention will now described in relation to the accompanying drawing in which figure 1 and figure 2 illustrate cable operated pull down type swashplate assembly with nylon fiber ball for helicopters. The said system comprises mainly two assembly, viz inner hollow vertical stationary part with nylon fiber ball (1) 95mm in diameter which fitted internally into half (6), of the moving part. Helicopter rotor shaft passed through the swashplate assembly and at top blades are attached with yak mechanism. The swashplate lifted vertically during steady flying position of helicopter. But when to move forward or lift the swashplate needed to tilt the blade accordingly. Swashplate continuously rotates with rotor shaft using the bearing (3).
When pilot apply force on actuator peddle, then the wire rope cable (8) get pull down through control cable hole (5) and the swashplate on the nylon fiber ball (1) tilted in corresponding side, during this swashplate cable stopper rods (2) which are fixed to stationary parts keep aligned swashplate support clamp (4) but pull towards it which causes tilting of swashplate whose motion is given to yak mechanism by pitch rods which are connected to swashplate by stapling rod (7). Thus operating respective wire rope cable (8) pilot can tilt swashplate in the required direction to move forward or brake the forward motion and or tilting helicopter towards left or right in forward motion.

CLAIMS :
We claim,
1. A system which is cable operated pull down type swashplate assembly with nylon
fiber ball for helicopter, said system comprising :
Nylon fiber ball, which support the moving swashplate part and allow tilting over it without any friction and wear, it provides long life of the maintenance free joint. Wire rope cable swashplate actuation system compirising of swashplate cable stopper rods, bearing, swashplate supporting clamps, control cable hole, half collectively used a pull down actuation force to tilt the swasplate in the desired direction to control the motion of the helicopter.
2. A system as claimed in claim 1 wherein, it is claim for the non-metallic spherical ball joint for swashplate, where in the nylon material is used to reduce the friction between two matching parts and allow tilting of swashplate without wear at interface, also extend the life span of the joint with reducing the maintenance.
3. A system as claimed in claim 1 wherein, it is claim for the flexible linkage to actuate the swashplate, where in wire rope cable is used instead of rigid rods, the flexible link gives more strength and allow flexibility in matching parts alignments and also allows vibrations.
4. A system as claimed in claim 1 wherein, it is claim for the pull down type actuation system for flexible wire rope cable which replaced the push up type of rigid rod link actuation, pull down type actuation reduces the overall force required as gravity is assisted the operation.