EP2352932A1 - Precompressed elastic element, particularly for fluid-operated actuators - Google Patents

Precompressed elastic element, particularly for fluid-operated actuators

Info

Publication number
EP2352932A1
EP2352932A1 EP09751844A EP09751844A EP2352932A1 EP 2352932 A1 EP2352932 A1 EP 2352932A1 EP 09751844 A EP09751844 A EP 09751844A EP 09751844 A EP09751844 A EP 09751844A EP 2352932 A1 EP2352932 A1 EP 2352932A1
Authority
EP
European Patent Office
Prior art keywords
elastic element
precompressed elastic
flange
fluid
female
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09751844A
Other languages
German (de)
French (fr)
Inventor
Antonio Marinoni
Ignazio Paris
Santo Rota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Torque SpA
Original Assignee
Air Torque SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Torque SpA filed Critical Air Torque SpA
Publication of EP2352932A1 publication Critical patent/EP2352932A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/12—Attachments or mountings
    • F16F1/128—Attachments or mountings with motion-limiting means, e.g. with a full-length guide element or ball joint connections; with protective outer cover
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1476—Special return means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type

Definitions

  • the present invention relates to a precompressed elastic element particularly for fluid-operated actuators.
  • fluid-operated actuators used for example for the remote actuation of valves and the like currently use precompressed elastic elements designed to perform the return stroke of pistons provided with a rack or slot link which interact with the actuation pin of the valve element.
  • Such precompressed elastic elements are provided in the most disparate manners and generally speaking consist of a male element and a female element, which retain a spring between them and can slide with respect to each other so as to cause the compression that makes it possible to perform the return stroke.
  • the precompressed elastic element consists of a male element and a female element, which can slide with respect to each other and are provided with flanges on which the female element operates.
  • the female element has a bush-like body, in which a stem of the male element can slide which has a protruding abutment rim that engages an annular rim of the bush for providing the extraction-preventing means.
  • screw means are provided which make it possible to connect the stem of the male element, inserted in the bush-like body of the female element, to the flanged element, thus making the precompression of the spring stable.
  • This type of solution entails first of all the need to have several components in order to provide the male element, and the assembly step is complicated, since screwing must be provided during the step for compression of the spring.
  • the aim of the invention is to eliminate the drawbacks noted above, by providing a precompressed elastic element particularly for fluid-operated actuators that allows monolithic provision of the male element, with the advantage of obtaining a precompression coupling of the spring that is particularly quick and easy.
  • an object of the invention is to provide an elastic element that can be assembled without using screw means, further having extraction-preventing means which are particularly safe, since an action is provided which enhances clamping during extrusion of the spring.
  • a precompressed elastic element particularly for fluid-operated actuators comprising a male element and a female element which can slide with respect to each other, a spring being further provided which operates between a first flange, which is associated with said male element, and a second flange, which is associated with said female element, characterized in that it comprises means for snap coupling between said male element and said female element which form extraction-preventing means.
  • Figure 1 is a schematic exploded view of a precompressed elastic element
  • Figure 2 is a view of the precompressed elastic element in the assembled condition
  • Figure 3 is an axial sectional view of the precompressed elastic element
  • Figure 4 is a schematic view of the elastic element fitted in a fluid- operated actuator.
  • the precompressed elastic element particularly for fluid-operated actuators comprises a male element 2 and a female element 3, which can slide with respect to each other.
  • the male element 2 has a stem 4 which has, at one end, a first flange 5.
  • the stem 4 can slide with respect to a bush-like body 6 of the female element 3, which has a second flange 7.
  • a spring 8 operates on a first flange 5 formed by the male element 2 and a second flange 7 formed by said female element. When the male and female elements are mutually joined, the spring is advantageously precompressed.
  • snap coupling means are provided which, in a preferred embodiment, consist of tabs 10, which can flex elastically in a radial direction and are formed at the end of the stem 2.
  • Teeth 11 are provided at the free end of the tabs 11 and have a tapering portion 12 for insertion and an engagement tooth 13 which forms, together with the stem 4, an engagement seat 14 that is frustum-shaped, with an acute apex angle.
  • the bush-like body 6 forms an annular rim 20, which provides a complementary mating tooth 21 , which can be inserted in the annular seat 14 and has at its vertex an angle of less than 90°, so as to perform an insertion in the seat which, once assembly has been performed, makes mutual disengagement between the male element and the female element impossible.
  • the extraction-preventing means provided by the coupling between the annular seat and the annular abutment tooth are particularly stable, and therefore the reliability of the precompressed elastic element is always ensured.
  • the materials used may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Actuator (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

A precompressed elastic element (1), particularly for fluid-operated actuators, comprising a male element (2) and a female element (3) which can slide with respect to each other. A first flange (5) formed by the male element (2) and a second flange (7) formed by the female element (3) are further provided; means (10) for snap coupling between the male element (2) and the female element (3) being provided which form extraction-preventing means.

Description

PRECOMPRESSED ELASTIC ELEMENT, PARTICULARLY FOR FLUID-OPERATED ACTUATORS
Technical Field
The present invention relates to a precompressed elastic element particularly for fluid-operated actuators. Background Art
As is known, fluid-operated actuators used for example for the remote actuation of valves and the like currently use precompressed elastic elements designed to perform the return stroke of pistons provided with a rack or slot link which interact with the actuation pin of the valve element.
Such precompressed elastic elements are provided in the most disparate manners and generally speaking consist of a male element and a female element, which retain a spring between them and can slide with respect to each other so as to cause the compression that makes it possible to perform the return stroke.
In German utility model DE 9314412 U, the precompressed elastic element consists of a male element and a female element, which can slide with respect to each other and are provided with flanges on which the female element operates. In the practical embodiment, the female element has a bush-like body, in which a stem of the male element can slide which has a protruding abutment rim that engages an annular rim of the bush for providing the extraction-preventing means.
To perform assembly, screw means are provided which make it possible to connect the stem of the male element, inserted in the bush-like body of the female element, to the flanged element, thus making the precompression of the spring stable.
This type of solution entails first of all the need to have several components in order to provide the male element, and the assembly step is complicated, since screwing must be provided during the step for compression of the spring.
Disclosure of the Invention
The aim of the invention is to eliminate the drawbacks noted above, by providing a precompressed elastic element particularly for fluid-operated actuators that allows monolithic provision of the male element, with the advantage of obtaining a precompression coupling of the spring that is particularly quick and easy.
Within this aim, an object of the invention is to provide an elastic element that can be assembled without using screw means, further having extraction-preventing means which are particularly safe, since an action is provided which enhances clamping during extrusion of the spring.
Another object of the present invention is to provide an elastic element which, due to its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use. Another object of the present invention is to provide an elastic element that can be obtained easily starting from commonly commercially available elements and materials and is also competitive from a purely economic point of view.
This aim as well as these and other objects that will become better apparent hereinafter are achieved by a precompressed elastic element particularly for fluid-operated actuators, according to the invention, comprising a male element and a female element which can slide with respect to each other, a spring being further provided which operates between a first flange, which is associated with said male element, and a second flange, which is associated with said female element, characterized in that it comprises means for snap coupling between said male element and said female element which form extraction-preventing means.
Brief Description of the Drawings
Further characteristics and advantages will become better apparent from the description of a preferred but not exclusive embodiment of a precompressed elastic element particularly for fluid-operated actuators, illustrated by way of non-limiting example in the accompanying drawings, wherein:
Figure 1 is a schematic exploded view of a precompressed elastic element;
Figure 2 is a view of the precompressed elastic element in the assembled condition;
Figure 3 is an axial sectional view of the precompressed elastic element; Figure 4 is a schematic view of the elastic element fitted in a fluid- operated actuator.
Ways of carrying out the Invention
With reference to the figures, the precompressed elastic element particularly for fluid-operated actuators, generally designated by the reference numeral 1, comprises a male element 2 and a female element 3, which can slide with respect to each other.
The male element 2 has a stem 4 which has, at one end, a first flange 5.
The stem 4 can slide with respect to a bush-like body 6 of the female element 3, which has a second flange 7.
A spring 8 operates on a first flange 5 formed by the male element 2 and a second flange 7 formed by said female element. When the male and female elements are mutually joined, the spring is advantageously precompressed. For performing the coupling between the male element 2 and the female element 3, snap coupling means are provided which, in a preferred embodiment, consist of tabs 10, which can flex elastically in a radial direction and are formed at the end of the stem 2.
Teeth 11 are provided at the free end of the tabs 11 and have a tapering portion 12 for insertion and an engagement tooth 13 which forms, together with the stem 4, an engagement seat 14 that is frustum-shaped, with an acute apex angle.
Correspondingly, the bush-like body 6 forms an annular rim 20, which provides a complementary mating tooth 21 , which can be inserted in the annular seat 14 and has at its vertex an angle of less than 90°, so as to perform an insertion in the seat which, once assembly has been performed, makes mutual disengagement between the male element and the female element impossible.
The extraction-preventing means provided by the coupling between the annular seat and the annular abutment tooth are particularly stable, and therefore the reliability of the precompressed elastic element is always ensured.
In practice, therefore, it is possible to obtain the male element and the female element as an integral part and to perform assembly, once the spring 8 has been fitted, by providing an axial compression which allows coupling, by the radial elastic yielding of the tabs 10 on which engagement teeth 11 are provided, within the bush-like body, with subsequent impossibility of extraction due to the coupling of the annular abutment tooth in the annular seat. From what has been described above it is therefore evident that the invention achieves the proposed aim and objects, and in particular the fact is stressed that a precompressed elastic element is provided in which there is an extremely small number of component elements that allow easy and quick assembly, with absolute assurance that the parts, unless structural failures occur, cannot separate one another.
In practice, the materials used, as long as they are compatible with the specific use, as well as the contingent shapes and dimensions, may be any according to requirements.
The disclosures in Italian Utility Model Application No. MI2008U000399 from which this application claims priority are incorporated herein by reference.
Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims

1. A precompressed elastic element (1), particularly for fluid-operated actuators, comprising a male element (2) and a female element (3) which can slide with respect to each other, a spring (8) being further provided which operates on a first flange (5) formed by said male element (2) and a second flange (7) formed by said female element (3), characterized in that it comprises means (10) for snap coupling between said male element (2) and said female element (3) which form extraction-preventing means.
2. The precompressed elastic element according to claim 1 , characterized in that said snap coupling means (10) comprise tabs (10) that can bend elastically in a radial direction and are provided at the end of a stem (4) that protrudes from said first flange (5), teeth (11) being provided at the free end of said tabs (10) and being able to be coupled with an annular rim (20) formed by a bush-like body (6) connected to said second flange (7).
3. The precompressed elastic element according to one or more of the preceding claims, characterized in that it comprises a tapered portion (12) at said teeth (11) associated with said tabs (10).
4. The precompressed elastic element according to one or more of the preceding claims, characterized in that said teeth (11) comprise an engagement tooth (13) that forms, together with said stem (4), an engagement seat (14) that has a substantially frustum-shaped configuration with an apex angle of less than 90°.
5. The precompressed elastic element according to one or more of the preceding claims, characterized in that it comprises, on said annular rim (20), a complementary mating tooth (21) that can be inserted in said engagement seat (14), said complementary mating tooth (21) having an apex angle of less than 90°.
EP09751844A 2008-12-04 2009-10-23 Precompressed elastic element, particularly for fluid-operated actuators Withdrawn EP2352932A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20080399 ITMI20080399U1 (en) 2008-12-04 2008-12-04 PRECOMPRESSED ELASTIC ELEMENT, PARTICULARLY FOR FLUID DYNAMIC ACTUATORS.
PCT/EP2009/063999 WO2010063514A1 (en) 2008-12-04 2009-10-23 Precompressed elastic element, particularly for fluid-operated actuators

Publications (1)

Publication Number Publication Date
EP2352932A1 true EP2352932A1 (en) 2011-08-10

Family

ID=41600774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09751844A Withdrawn EP2352932A1 (en) 2008-12-04 2009-10-23 Precompressed elastic element, particularly for fluid-operated actuators

Country Status (3)

Country Link
EP (1) EP2352932A1 (en)
IT (1) ITMI20080399U1 (en)
WO (1) WO2010063514A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104595505A (en) * 2013-10-14 2015-05-06 费希尔控制国际公司 Interlocking Spring Seat Assembly and Rotary Control Valve Comprising Same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8579249B2 (en) * 2010-11-04 2013-11-12 Fisher Controls International Llc Biasing device for use with actuators of fluid valves
US9181929B2 (en) 2013-03-08 2015-11-10 Rotex Manufacturers And Engineers Private Limited Actuator with efficient energy accumulation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2283125A (en) * 1939-01-13 1942-05-12 United Carr Fastener Corp Locking snap fastener
DE1066451B (en) * 1956-09-25 1959-10-01 Siemens Ag Screwless quick release for housing parts, especially for covers and boxes of electrical switching and distribution devices
AU438449B2 (en) * 1969-10-30 1973-07-25 High Polymer Chemical Industries, Limited Synthetic resin fastener
GB2183711A (en) * 1985-10-29 1987-06-10 Tee Bee Products Stud and socket fastener
US7021610B2 (en) * 2002-09-30 2006-04-04 Barnes Group Inc. Ring shaped spring device
EP1637763B1 (en) * 2003-06-26 2011-11-09 Bosch Corporation Unitized spring device and master cylinder including the same
KR100608674B1 (en) * 2004-06-17 2006-08-08 엘지전자 주식회사 Vibration isolation support apparatus for refrigerator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010063514A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104595505A (en) * 2013-10-14 2015-05-06 费希尔控制国际公司 Interlocking Spring Seat Assembly and Rotary Control Valve Comprising Same

Also Published As

Publication number Publication date
WO2010063514A1 (en) 2010-06-10
ITMI20080399U1 (en) 2010-06-05

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