IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0424949
(2003-04-29)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
24 인용 특허 :
3 |
초록
▼
An actuator for operation of a valve, said actuator comprising tubular housing, which accommodates therein a piston, mounted with possibility for reciprocating linear stroke motion, an operating rod, which is operatively coupled with the piston and is rotatable about the longitudinal axis upon recip
An actuator for operation of a valve, said actuator comprising tubular housing, which accommodates therein a piston, mounted with possibility for reciprocating linear stroke motion, an operating rod, which is operatively coupled with the piston and is rotatable about the longitudinal axis upon reciprocating stroke motion of the piston and a cam follower arrangement for transferring the piston reciprocating linear stroke motion into rotation of the operating rod, The actuator is provided with at least two fixing rods for preventing rotation of the piston. The fixing rods are rigidly secured at one end wall of the cylinder. The fixing rods extend parallel to the longitudinal axis and enter into respective blind passages provided at the first piston end to allow the linear stroke motion. The actuator is provided with at least two additional fixing rods, to enable the linear stroke motion. The additional rods are parallel to the longitudinal axis and enter into respective blind passages provided at the second piston end.
대표청구항
▼
1. An actuator for operation of a valve provided with a rotatable valve member, said actuator comprising:a tubular housing, defined by a longitudinal axis, by a peripheral cylindrical wall and by two opposite end walls, said housing accommodating thereina piston, mounted with possibility for recipro
1. An actuator for operation of a valve provided with a rotatable valve member, said actuator comprising:a tubular housing, defined by a longitudinal axis, by a peripheral cylindrical wall and by two opposite end walls, said housing accommodating thereina piston, mounted with possibility for reciprocating linear stroke motion along the longitudinal axis in a forward and a backward direction between one end wall and the opposite end wall, said piston is defined by a periphery body portion, which is concentric with the housing and by a first and by a second end, said piston is actuatable from at least one end thereof,an operating rod, which is operatively coupled with the piston and is rotatable about the longitudinal axis upon reciprocating stroke motion of the piston, said operating rod is adapted to output a rotation moment to the valve member,a cam follower arrangement for transferring the piston reciprocating linear stroke motion into rotation of the operating rod, said arrangement comprises a cam follower means, which is associated with the operating rod and is displaceable along a helical path provided in the piston,at least two fixing rods, which are rigidly secured at one end wall of the cylinder vis-à-vis the first end of the piston, said fixing rods extend parallel to the longitudinal axis and enter into respective blind passages provided at the first piston end to allow the linear stroke motion,wherein said actuator is provided with at least two additional fixing rods, which are rigidly secured at an opposite end wall of the cylinder vis-á-vis a second piston end, said additional fixing rods extend parallel to the longitudinal axis and enter into respective blind passages provided at the said second piston end to enable the linear stroke motion. 2. The actuator as defined in claim 1, in which said piston is defined by a cup-like body portion, wherein said piston is mounted in the housing with possibility to slide over the operating rod during the reciprocating linear stroke motion. 3. The actuator as defined in claim 2, in which said cam follower means comprises at least one roller, which is carried by a cross-pin secured in a transverse bore provided in the operating rod. 4. The actuator as defined in claim 3, in which said helical path comprises at least one helical slot cut in the piston periphery body portion. 5. The actuator as defined in claim 4, in which said cam follower arrangement comprises two rollers and two corresponding helical slots, said slots are defined by the same helix angle. 6. The actuator as defined in claim 5, in which said piston is actuatable at its first end to enable forward linear stroke motion and there is provided a biasing means acting on the second piston end to enable backward linear stroke motion. 7. The actuator as defined in claim 6, in which the blind passages provided at the first piston end do not communicate with the blind passages provided at the second piston end. 8. The actuator as defined in claim 1, in which a bushing means is provided in at least one blind passage to enable frictional engagement with the fixing rod entering this blind passage. 9. The actuator as defined in claim 8, in which said bushing means is made of a material with low friction coefficient. 10. The actuator as defined in claim 9, in which said bushing means is made of plastic material. 11. The actuator as defined in claim 1, in which said fixing rods are rigidly secured in the end walls by embossing of the end wall material around the rods.
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