US3376021A - Pneumatic vibrators without bearings - Google Patents

Pneumatic vibrators without bearings Download PDF

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Publication number
US3376021A
US3376021A US544741A US54474166A US3376021A US 3376021 A US3376021 A US 3376021A US 544741 A US544741 A US 544741A US 54474166 A US54474166 A US 54474166A US 3376021 A US3376021 A US 3376021A
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Prior art keywords
cylinder
vibrations
vibrators
movable
cylinders
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US544741A
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English (en)
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Fontaine Michel Alphonse
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VIBRATECHNIQUES
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VIBRATECHNIQUES
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/186—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with rotary unbalanced masses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18544—Rotary to gyratory
    • Y10T74/18552—Unbalanced weight

Definitions

  • One of the cylinders is stationary and the other cylinder is capable of freely rolling with hypocycloidal motion relative to the stationary cylinder.
  • a movable plate is carried by one of the cylinders and divides the space between the cylinders into two chambers. Inlet and exhaust openings are provided so as to interconnect the two chambers with a fluid pressure source and with the atmosphere, respectively.
  • This invention relates to pneumatic vibrators of the type which consists of a hollow cylinder, an inner cylinder of smaller diameter which is disposed within said hollow cylinder, one of said cylinders being stationary and the other cylinder being movable, the movable cylinder being capable of rolling freely with respect to the stationary cylinder without mechanical connection with any external member or,in other words, said movable cylinder does not rotate about its own axis within bearings on the stationary cylinder, but is endowed with epicycloidal or hypocycloidal motion.
  • a single moving plate or paddle divides the space formed between the two cylinders into two chambers, said paddle being carried by one of said cylinders and capable of withdrawing into a recess formed longitudinally in said one cylinder. Admission and exhaust openings are formed in said cylinder respectively on each side of said paddle so as to put the two chambers continuously in communication respectively with a compressed-air source and with the atmosphere.
  • vibrators of this type as compared with vibrators of the type comprising an eccentric mass rotatably mounted in hearings or vibrators of the multipleblade type are well known, with the result that vibrators of the type described are preferred to the others in many applications, in particular when high vibration frequencies are required. On the other hand, these vibrators are not very suitable in cases where low vibration frequencies are necessary.
  • the center of gravity of the transverse cross-section of the movable cylinder describes a circle about the geometric center of the transverse cross-section of the stationary cylinder, at an angular velocity wS, which is the actual frequency of the vibrations produced.
  • the movable cylinder is endowed with a movement of rotation about its axis at an angular velocity to! which does not play any part in the work of the vibrator since this movement does not produce any useful work.
  • D being the diameter of the outer cylinder
  • 07 being the diameter of the inner cylinder
  • e being the difference 3,376,021 Patented Apr. 2, 1968 between these diameters to which corresponds the amplitude of the vibrations.
  • the frequency of the vibrations mg is inversely proportional to the difference in diameters e, namely to the am plitude of the vibrations.
  • the aim of this invention is to circumvent the disadvantage of vibrators of the type considered while at the same time retaining the known advantages of said vibrators over those which comprise an eccentric mass rotatably mounted in bearings or multiple-blade vibrators, and consequently to increase the field of application of vibrators of the type considered.
  • the vibrator in accordance with the invention is characterized in that the movable cylinder is provided with an eccentric weight, with the result that the center of gravity of its transverse cross-section is displaced from the geometrical center of the transverse crosssection of its cylindrical rolling surface.
  • the amplitude of vibrations of the first source will be extremely small inasmuch as it is proportional to e and the work produced by these vibrations is negligible.
  • vibrators of the type considered can therefore be extended to a number of new applications for which they had not originally been intended, such as ground-compacting, plastering, pile-driving and so forth.
  • FIG. '1 is an axial sectional view of the first form of embodiment
  • FIG. 2 is a transverse sectional view of the same form of embodiment
  • FIG. 3 is a transverse sectional view of the second form of embodiment.
  • the pneumatic vibrator which is illustrated in FIGS. 1 and 2 is of the type which forms the subject of French Patent No. 1,099,956 of Jan. 7, 1954, in the name of Michel Fontaine.
  • the vibrator referred to comprises a stationary inner cylinder 1, a hollow and movable outer cylinder 2 which is adapted to rotate around said inner cylinder. Said outer cylinder is guided between two end plates 3 and 4, which are fixed with respect to the cylinder 1, and is shielded by a casing 5 which is also fixed with respect to said cylinder 1. The complete casing assembly is secured to a base plate 6 which can be attached to the apparatus to which vibrations are to be imparted.
  • the stationary cylinder 1 is pierced by an axial intake duct 7 which communicates with a supply pipe 8 for the admission of compressed air.
  • Said duct 7 communicates by way of holes 9 with a longitudinal recess or groove 10 which opens at the surface of the cylinder 1 and in which a paddle or plate 11 is adapted to slide freely, the outer edge of said paddle being in contact with the internal cylindrical surface of the hollow cylinder 2 and being capable of withdrawing completely inside said groove 10.
  • the paddle 11 is provided with recesses 12 opposite the holes 9 for putting the duct 7 in communication with one of the chambers 13 and 14 which are formed by, and on the opposite sides of, the paddle within the space formed between the cylinders 1 and 2.
  • the chamber 14 is connected to the atmosphere by means of exhaust openings 15 and 16 through the end-plates 3 and 4 respectively.
  • this vibrator is identical with that which is described in the patent cited earlier, at least insofar as concerns the setting in rotation of the movable cylinder 2.
  • said movable cylinder 2 is provided with an eccentric weight by virtue of the fact that the inner and outer cylindrical surfaces thereof are not coaxial. It is self-evident that said eccentric weight could also be obtained simply by adding an eccentric mass to a normal cylinder or, alternatively, by forming weight-reducing recesses in suitable locations.
  • vibrations are created by the rolling motion of the movable cylinder 2 around the stationary cylinder 1, and vibrations are caused by the rotation of the movable cylinder 2 about its own axis by reason of the fact that said cylinder 2 is displaced off-center of the cylinder 1.
  • the vibrator which is illustrated in FIG. 3 is of the type described in French Patent No. 1,279,241 of Mar. 10, 1960 in the name of Vibratechniques, S.A. This unit differs from the preceding only in the presence of an intermediate movable cylinder 17 between the stationary cylinder 1 and movable cylinder 2.
  • the operation of the vibrator of FIG. 3 is identical with that which is described in the patent referred-to in regard to the setting in rotation of the moving cylinders.
  • the fact that the movable cylinder 2 is provided with an eccentric weight makes it possible in addition to obtain the results hereinabove described.
  • a pneumatic vibrator which consists of a hollow cylinder, an inner cylinder loosely disposed within said hollow cylinder, one of said cylinders being relatively stationary and the other cylinder being relatively movable, the movable cylinder being capable of rolling freely with respect to the stationary cylinder whereby the relative movement of said inner cylinder with respect to said hollow cylinder is hypocycloidal, one of said cylinders having a lengthwise recess communicating with a space formed between the two cylinders, and plate means slideably disposed in said recess and dividing said space into two chambers;
  • the improvement comprising the provision of an eccentric mass on the movable cylinder so that the center of gravity thereof is displaced radially from the geometrical center thereof.
  • a pneumatic vibrator according to claim 1, includin g housing means having a central chamber;
  • said inner cylinder is rigidly connected to said housing means and extends through said central chamber;
  • hollow cylinder encircles and is rotatably supported upon said inner cylinder
  • said hollow cylinder has a peripheral surface eccentric with the inner surface thereof.
  • a pneumatic vibrator according to claim 2, wherein said inner cylinder has a substantially coaxial opening therein communicating with said source of pressure fluid and a plurality of radially disposed openings communicating between said central opening and said recess;
  • said plate means has a plurality of grooves in one side thereof extending through the radially inner edge thereof and communicating with said space
  • a pneumatic vibrator including an intermediate hollow cylinder loosely encircling said inner cylinder within said space, said chambers being disposed between the outer surface of the inner cylinder and the inner surface of the intermediate cylinder;
  • a vibrator for actuation by pressure fluid comprising:
  • an outer hollow cylinder an inner cylinder eccentrically disposed within said outer cylinder; means definirv a recess in the wall of one of said cylinders and opening toward the adjacent wall of the other cylinder; blade means slideably disposed within said recess; a source of pressure fluid; conduit means in said one cylinder for communicating between the radially inner edge portion of said recess and said source of pressure fluid, whereby the radially outer edge of said blade means is held in contact with the wall of said other cylinder to form two chambers between said cylinders on opposite sides of the blade means;
  • weight means on one side of one of said cylinders so that the center of gravity thereof is displaced radially from the geometrical center thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
US544741A 1965-05-13 1966-04-25 Pneumatic vibrators without bearings Expired - Lifetime US3376021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR16940A FR1443363A (fr) 1965-05-13 1965-05-13 Perfectionnement aux vibrateurs pneumatiques sans paliers

Publications (1)

Publication Number Publication Date
US3376021A true US3376021A (en) 1968-04-02

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Application Number Title Priority Date Filing Date
US544741A Expired - Lifetime US3376021A (en) 1965-05-13 1966-04-25 Pneumatic vibrators without bearings

Country Status (10)

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US (1) US3376021A (enrdf_load_stackoverflow)
AT (1) AT271055B (enrdf_load_stackoverflow)
BE (1) BE678056A (enrdf_load_stackoverflow)
CH (1) CH432908A (enrdf_load_stackoverflow)
DE (1) DE1260839B (enrdf_load_stackoverflow)
DK (1) DK109502C (enrdf_load_stackoverflow)
ES (1) ES325103A1 (enrdf_load_stackoverflow)
FR (1) FR1443363A (enrdf_load_stackoverflow)
GB (1) GB1093117A (enrdf_load_stackoverflow)
NL (1) NL6606471A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176983A (en) * 1978-07-17 1979-12-04 Ingersoll-Rand Company Variable eccentric device
US4293231A (en) * 1980-01-07 1981-10-06 Lyle John S Bearingless vibrator
US4512611A (en) * 1981-11-06 1985-04-23 Grasse Family Trust Oscillated head with bearing support and quick demountability
US4653927A (en) * 1985-06-21 1987-03-31 Wadensten Theodore S Rotary air roller vibrator

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2529478A1 (fr) * 1982-07-01 1984-01-06 Procedes Tech Const Vibrateur a air comprime a injection d'air variable en fonction de la position de la palette
US5433523A (en) * 1992-11-23 1995-07-18 International Pipe Machinery Corp. Vibrators
FR2701873B1 (fr) * 1993-02-26 1995-04-28 Procedes Tech Construction Vibrateurs pneumatiques a au moins trois éléments cylindriques mobiles en rotation les uns par rapport aux autres.
RU2224903C2 (ru) * 2002-04-19 2004-02-27 Пятин Викентий Васильевич Утилизатор энергии
RU2224904C1 (ru) * 2002-06-07 2004-02-27 Пятин Викентий Васильевич Универсальный утилизатор энергии

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1829441A (en) * 1929-11-25 1931-10-27 Albert W Munsell Vibrator
US2967048A (en) * 1958-11-07 1961-01-03 Fontaine Michel Alphons Irenee Vibrator
US3030079A (en) * 1960-03-10 1962-04-17 Vibratechniques Sa Vibrator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092711B (de) * 1954-01-07 1960-11-10 Michel Fontaine Durch ein Druckmittel angetriebener Rotationsvibrator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1829441A (en) * 1929-11-25 1931-10-27 Albert W Munsell Vibrator
US2967048A (en) * 1958-11-07 1961-01-03 Fontaine Michel Alphons Irenee Vibrator
US3030079A (en) * 1960-03-10 1962-04-17 Vibratechniques Sa Vibrator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176983A (en) * 1978-07-17 1979-12-04 Ingersoll-Rand Company Variable eccentric device
US4293231A (en) * 1980-01-07 1981-10-06 Lyle John S Bearingless vibrator
US4512611A (en) * 1981-11-06 1985-04-23 Grasse Family Trust Oscillated head with bearing support and quick demountability
US4653927A (en) * 1985-06-21 1987-03-31 Wadensten Theodore S Rotary air roller vibrator

Also Published As

Publication number Publication date
NL6606471A (enrdf_load_stackoverflow) 1966-11-14
DE1260839B (de) 1968-02-08
BE678056A (enrdf_load_stackoverflow) 1966-09-19
DK109502C (da) 1968-04-29
AT271055B (de) 1969-05-27
FR1443363A (fr) 1966-06-24
ES325103A1 (es) 1967-01-01
GB1093117A (en) 1967-11-29
CH432908A (fr) 1967-03-31

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