US3614896A - Eccentric mechanism for converting a rotary movement into a reciprocating rectilinear movement of variable amplitude - Google Patents
Eccentric mechanism for converting a rotary movement into a reciprocating rectilinear movement of variable amplitude Download PDFInfo
- Publication number
- US3614896A US3614896A US849025A US3614896DA US3614896A US 3614896 A US3614896 A US 3614896A US 849025 A US849025 A US 849025A US 3614896D A US3614896D A US 3614896DA US 3614896 A US3614896 A US 3614896A
- Authority
- US
- United States
- Prior art keywords
- axis
- movement
- pin
- crank
- rotary member
- 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.)
- Expired - Lifetime
Links
Images
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
- F16H—GEARING
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/46—Gearings comprising primarily only links or levers, with or without slides with movements in three dimensions
- F16H21/50—Gearings comprising primarily only links or levers, with or without slides with movements in three dimensions for interconverting rotary motion and reciprocating motion
-
- 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
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/18184—Crank, pitman, and lever
-
- 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
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/18296—Cam and slide
- Y10T74/18336—Wabbler type
Definitions
- a slotted cup-like rotary member drives a cylindrical crank-pin through an eccentric lug and offset socket so that its axis describes an eccentricity-setting cone having its contour delimited by a high position and a low position, and having a generatrix parallel to the axis of rotation of the rotary member.
- This invention relates to an eccentric mechanism for converting a rotary movement into a reciprocating rectilinear movement of variable amplitude, of the kind comprising an input shaft rigid with a rotary member, a crankpin driven by said rotary member in such a way as to describe a cone, a runner within which the crank-pin can slide, adjustment means permitting variation of the relative longitudinal position of the crank-pin relative to the runner, and an output member connected to the runner and constrained to move along a straight line perpendicular to the axis of the cone.
- An object of the present invention is to porvide an cecentric mechanism in which the amplitude of movement of the output member may be varied in as asymmetrical manner.
- the crank-pin is a cylindrical rod one end of which is secured to a cross-piece mounted on a transverse pivot whose ends slide in two longitudinal slideways provided within the said rotary member and contained in a meridian plane of the latter, and the other end of whichcarries a ball cooperating with a socket offset relative to the axis of rotation of the rotary member and carried by a slide member capable of sliding axially in a slideway which is parallel to this axis of rotation and which prevents it from rotating around the latter, the said cross-piece and socket being arranged so that the cone which is described by the axis of the crank-pin under the effect of the rotation of the rotary member has a generatrix which is parallel to the said axis of rotation, wherein the said runner comprises a member which is provided with
- FIG. 1 is a longitudinal section
- FIG. 2 is a diagram showing two positions of one element
- FIG. 4, 5 and 6 are cross sections along the lines IVIV, V-V, VI-VI respectively of FIG. 1.
- the mechanism shown in FIG. 1 is housed in a cylindrical casing 1 which is itself carried by a framework 2.
- This mechanism comprises an input shaft 3 which by means not shown is rotatably driven as indicated by the arrow 4.
- This input shaft is rigid with a rotary member 5 rotating on bearings 6, 7.
- the rotary member 5 which is hollowed out in the form of a cup, is provided with slots 8, 9 in which can slide blocks 10, 11 carried by the ends of a transverse pivot 12.
- the slots 8, 9 are arranged in a meridian plane of ther otary member 5, so that the trans verse pivot 12 is directed along a diameter of this rotary member.
- the transverse pivot is thus driven by the rotation of the member 5 around the axis 13 of the latter, and it can slide axially within the latter.
- a crank-pin 14 constituted by a cylindrical rod, carries at one of its ends a cross-piece 15 in the form of a half-moon, which is secured thereto by a pin 16 and which is traversed by the transverse pivot 12 around which it can pivot.
- the other end of the crank-pin 14 carires an eccentric lug 17 on which is secured a ball 18 of a ball and socket joint.
- This ball is held in a socket 19 provided in a slide member 20 and it is retained in this socket by a plate 21 secured to the slide member by screws 22.
- the socket 19 thus houses the ball of the crank-pin 14 and this socket is offset relative to the axis 13.
- the distance between the axis 25 of the crank-pin 14 and the transverse pivot 12, on the one hand, and the eccentricity setting of the socket 19 in the slide member 22 on the other hand, are so chosen that taking into account the ecentric-setting of the lug 17, there exists an angular position of the rotary member 5 called the high position in which the axis of the crank-pin is parallel to the axis of rotation 13.
- the angular connection of the crank-pin 14 to its cross-piece 15 is such that when it is in this high position, the lug 17 and the axis 25 are located in the same meridian plane as the rotary member 5, a meridian plane which, in FIG. 1 coincides with the plane of the drawing.
- crank-pin 14 passes through a low position 14 shown in bro-ken lines (see FIG. 2) and that, upon a complete revolution, its axis 25 describes a so-called eccentricity-setting cone, the apparent conour of which is delimited by the high position 25 and the low position 25' of this axis and which has a generatrix 25 parallel to the axis of rotation 13.
- This eccentricity-setting cone has an apical opening A and its axis 26 is inclined relative to the axis of rotation 13; it meets the latter at the location where the transverse pivot 12 intersects it.
- the slide member 20 is arranged in such a way as to be axially displaceable in the housing 1 which acts as a slideway therefor and a radial stud 23 which extends through a longitudinal slot 24 provided in the housing and prevents it from turning around the axis 13; the centre of the socket is thus displaced along a straight line parallel to the axis of rotation 13.
- a runner constituted by a member 27 provided with a hole delimited by two opposed conical surfaces 28, 29 (FIG. 3) each of which has an apical opening equal to the apical opening A of the eccentricity setting 25, 25'.
- This arrangement permits the crank-pin to rotate and to slide in this runner while causing it to move without play over its conical movement.
- the member 27 is held between two rods 30, 31 which constitute a first slideway enabling it to slide in a direction 32 perpendicular to the meridian plane defined by the axis of rotation 13- and by the high generatrix 25 of the eccentricity-setting cone.
- These two rods extend through the housing 1 via two slots 33, 34 and are assembled by means of two crosspieces 35, 36 (FIG. These cross-pieces constitute blocks which in their turn slide in two grooves 37, 38 constituting a second slideway which enables the first to move in a direction 39 perpendicular to the ads 26 of the cone eccentricity.
- the rod 31 extends beyond the blocks 35, 36 and its ends 40, 41 serve as pivots on which is pivoted a yoke 42. In the example described, this yoke is in turn pivoted on a lever 43 guided in a sliding hearing 44 arranged in the framework 2.
- the slide member 20 is rigid with a rod 45 which constitutes the end of a screw 46 and which cooperates with nut 47 carried by a sleeve 48.
- This latter rotates in a bearing constituted by three resilient rods 51, 52, 53 (FIG. 6) located in a plane perpendicular to the axis of rotation 13 and arranged in such a way as to form a triangular frame which circumscribes this sleeve: the ends 5459 of these rods are held in a bearing support 60 while their middle points 61, 62, 63 cooperate with a circular groove 64 in the sleeve 48.
- This triangular frame thus constitutes a resilient hearing, which may be advantageous when there is a risk of alignment defects and when it is desirable to eliminate the stresses which may result therefrom.
- the sleeve 48 carries a knob 65 secured to it by a pin 66.
- the rod 45, screw 46, nut 47, sleeve 48 and knob 65 constitute control means enabling the axial position of slide member 20, and consequently of crankpin 14 and cross-piece 15 to be varied.
- crank-pin 14 due to the fact that it is angularly rigid with the rotary member 5 via the slots 8, 9, transverse pivot 12 and cross-piece 15, rotates around the socket 19, so that its axis 25 describes the eccentricity-setting cone shown diagrammatically by the lines 25, 25' which represent two particular generatrices, the high generatrix 25 and the low generatrix 25'. Consequently the centre of the runner 27, which is guided in the slideways 30, 31 and 37, 38 cannot leave a plane perpendicular to the axis 26 of this cone, and is obliged to describe the circle constituted by the intersection of the cone with the plane.
- the output member has thus imparted thereto in the direction 39 a rectilinear reciprocating movement having an amplitude which is equal to the radius of this circle, the total travel being equal to the diameter. If, by manipulating the nut 47 by means of knob 65, the axial position of slide member 20, and thus of crank-pin 14 and cross-piece 15 is varied, the distance between the apex of the cone of eccentricity 25, 25' and the plane in which the runner moves is also varied, this plane being defined by the directions 32 and 39. In this way the diameter of the circle constituted by the intersection of this cone and plane is varied and hence the amplitude of the alternating movement communicated to the output member is also varied.
- the modification in amplitude may be made both while the rotary member is rotating as well as when it is stationary. It may be advantageous, in the latter case, to permanently immobilize the crank-pin in its high position, where its axis 25 coincides with the high generatrix of the cone of eccentricity.
- the modification of the axial position of the slide member 20 necessary for changing the amplitude then has no effect on the output member which remains perfectly stationary.
- the mechanism is provided with a resilient detent which may be constituted by a ball trapped in a socket 71 arranged in the casing 1. This ball is urged by a spring 72 so as to cooperate with a longitudinal slot 73 on the external lateral surface of the rotary member 5 in a suitable angular position.
- This arrangement is advantageous when the mechanism is used to actuate a piston pump which transports a fluid; one can thus be certain, by modifying the amplitude adjustment when the mechanism is stationary, that this modification of adjustment will not cause unwanted displacements of fluid. It is thus an advantage which renders this mechanism particularly suitable for actuating pumps for dosing microanalysis apparatus, in particular bio-chemical microanalysis.
- the mounting of the ball 18 on the lug 17 offset relative to the axis 25 of the crank-pin is not indispensable. This arrangement is provided in order to permit the runner to slide up to the moment when the plane in which it moves passes through the centre 50 of the eccentricity-setting cone, i.e. to permit the amplitude adjustment range to be extended up to the value zero. If this requirement is not necessary, the ball can then be fixed in a position coaxial with the axis 25, i.e. to use a central lug 17.
- An eccentric mechanism for the conversion of a rotary movement into a reciprocating rectilinear movement of variable amplitude comprising an input shaft rigid with a rotary member, a crank-pin driven by said rotary member so as to describe a cone, a runner within which said crank-pin can slide, adjustment means permitting variation of the relative longitudinal position of said crank-pin relative to said runner and an output member connected to said runner and constrained to move along a straight line perpendicular to the axis of said cone, said crank-pin being constituted by a cylindrical rod, one end of which is secured to a cross-piece mounted on a transverse pivot whose ends slide in two longitudinal slideways provided within said rotary member and contained in a meridian plane of the latter, and the other end of which carries a ball cooperating with a socket offset relative to the axis of rotation of the rotary member and carried by a slide member capable of sliding axially in a slideway which is parallel to said axis of rotation and which prevents it from rotating around the latter
- adjustment means comprise a first screw threaded member c0- axial with said axis of rotation and cooperating with a second screw threaded member mounted on a fixed bearing.
- Mechanism according to claim 2 comprising a resilient detent adapted to locate accurately the angular position of the said rotary member which corresponds to the passage of the said crank-pin in the position where its axis coincides with the said parallel generatrix.
- the said fixed bearing comprises at least three resilient rods arranged in a plane perpendicular to the said axis of rotation in such a way as to form a triangular frame circumscribing a bush carrying the said second screw threaded member, the ends of these rods being fixed and their mid-points cooperating with a circular groove arranged in said sleeve.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Friction Gearing (AREA)
- Transmission Devices (AREA)
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1239868A CH499033A (en) | 1968-08-16 | 1968-08-16 | Eccentric mechanism intended to transform a rotary movement into a reciprocating rectilinear movement of adjustable amplitude |
Publications (1)
Publication Number | Publication Date |
---|---|
US3614896A true US3614896A (en) | 1971-10-26 |
Family
ID=4382624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US849025A Expired - Lifetime US3614896A (en) | 1968-08-16 | 1969-08-11 | Eccentric mechanism for converting a rotary movement into a reciprocating rectilinear movement of variable amplitude |
Country Status (6)
Country | Link |
---|---|
US (1) | US3614896A (en) |
CH (1) | CH499033A (en) |
FR (1) | FR2015797A1 (en) |
GB (1) | GB1282004A (en) |
NL (1) | NL158270B (en) |
SE (1) | SE342877B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106704509A (en) * | 2017-01-21 | 2017-05-24 | 济南天辰试验机制造有限公司 | Eccentric mechanism capable of achieving continuous amplitude adjustment in motion |
CN113653776A (en) * | 2021-08-19 | 2021-11-16 | 沈阳飞机工业(集团)有限公司 | Automatic resetting device for rotation-to-linear motion |
-
1968
- 1968-08-16 CH CH1239868A patent/CH499033A/en not_active IP Right Cessation
-
1969
- 1969-06-30 NL NL6909989.A patent/NL158270B/en not_active IP Right Cessation
- 1969-08-11 US US849025A patent/US3614896A/en not_active Expired - Lifetime
- 1969-08-14 FR FR6928030A patent/FR2015797A1/fr not_active Withdrawn
- 1969-08-15 GB GB40899/69A patent/GB1282004A/en not_active Expired
- 1969-08-15 SE SE11356/69A patent/SE342877B/xx unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106704509A (en) * | 2017-01-21 | 2017-05-24 | 济南天辰试验机制造有限公司 | Eccentric mechanism capable of achieving continuous amplitude adjustment in motion |
CN106704509B (en) * | 2017-01-21 | 2024-05-10 | 济南天辰试验机制造有限公司 | Eccentric mechanism capable of realizing continuous amplitude adjustment in motion |
CN113653776A (en) * | 2021-08-19 | 2021-11-16 | 沈阳飞机工业(集团)有限公司 | Automatic resetting device for rotation-to-linear motion |
Also Published As
Publication number | Publication date |
---|---|
DE1942364B2 (en) | 1977-03-17 |
NL158270B (en) | 1978-10-16 |
CH499033A (en) | 1970-11-15 |
DE1942364A1 (en) | 1970-02-19 |
FR2015797A1 (en) | 1970-04-30 |
SE342877B (en) | 1972-02-21 |
GB1282004A (en) | 1972-07-19 |
NL6909989A (en) | 1970-02-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3974714A (en) | Pump driving mechanism with adjustable stroke | |
US3614896A (en) | Eccentric mechanism for converting a rotary movement into a reciprocating rectilinear movement of variable amplitude | |
US4590812A (en) | Device for converting between rotary and rectilinear motion | |
US3374683A (en) | Transmission devices for converting rotary motion into reciprocating motion | |
US3249008A (en) | Guide means for a barrel carrying an optical element | |
US3592067A (en) | Device for converting between linear and circular movement | |
US3706233A (en) | Eccentric mechanism for converting a rotary movement into a reciprocating rectilinear movement of variable amplitude | |
US2357035A (en) | Variable speed drive | |
US3537215A (en) | Precision rotary location of a crankshaft in an automatic crankpin grinding machine | |
US2245570A (en) | Fluid pressure device | |
US3171287A (en) | Mechanism for the stroke-control of reciprocating members, particularly in proportioning pumps | |
US3510202A (en) | Lens carriage for continuously variable magnification stereomicroscope | |
US3116648A (en) | Dosing pump | |
US3805628A (en) | Transmissions | |
US3407545A (en) | Assembly for statically balancing rotary articles | |
US4941367A (en) | Rotary to linear motion converter | |
US2858719A (en) | Intermittent motion mechanism | |
GB798781A (en) | Improvements in or relating to a mechanical motion converting system | |
CN102537264B (en) | Speed ratio adjusting mechanism of stepless transmission | |
US2757543A (en) | Adjustable rocking mechanism | |
US2608101A (en) | Motion translating mechanism | |
US2978948A (en) | Optical scanning device | |
US2808726A (en) | chombard | |
US2722131A (en) | Variable speed sheave structure | |
US2789441A (en) | Driving mechanisms |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROHM & HAAS COMPANY (MERGED WITH AND INTO), PENNSY Free format text: RE-RECORD OF AN INSTRUMENT RECORDED OCT. 6, 1980, REEL 3804, FRAMES 837-840, TO SHOW NEW OWNER OF SAID PATENTS;ASSIGNOR:MICROMEDIC SYSTEMS, INC.;REEL/FRAME:003848/0449 Effective date: 19800903 Owner name: ROHM & HAAS COMPANY (MERGED WITH AND INTO) Free format text: RE-RECORD OF AN INSTRUMENT RECORDED OCT. 6, 1980, REEL 3804, FRAMES 837-840, TO SHOW NEW OWNER OF SAID PATENTS;ASSIGNOR:MICROMEDIC SYSTEMS, INC.;REEL/FRAME:003848/0449 Effective date: 19800903 |
|
AS | Assignment |
Owner name: ICN MICROMEDIC SYSTEMS, INC., 3300 HYLAND AVENUE, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICROMEDIC SYSTEMS, INC., A CORP OF DE.;REEL/FRAME:004488/0488 Effective date: 19851121 |