US3325610A - Adjustable cam having readily detachable indexing means - Google Patents
Adjustable cam having readily detachable indexing means Download PDFInfo
- Publication number
- US3325610A US3325610A US481836A US48183665A US3325610A US 3325610 A US3325610 A US 3325610A US 481836 A US481836 A US 481836A US 48183665 A US48183665 A US 48183665A US 3325610 A US3325610 A US 3325610A
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- US
- United States
- Prior art keywords
- disc
- cam
- shaft
- notch
- edge
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
- H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
- H01H19/60—Angularly-movable actuating part carrying no contacts
- H01H19/62—Contacts actuated by radial cams
- H01H19/623—Adjustable cams
Definitions
- This invention relates to adjustable cams, and to a timing circuit employing the same, and more particularly to such a cam having a readily detectable indexing means incorporated on the face of the cam.
- adjustable cams having a pair of cooperating discs which are relatively adjustable angularly of the shaft on which they are mounted
- a cam is selectively set or indexed by aligning an index on one of the cam discs, such as an edge of a recess in that disc, with respect to an index on the other cam disc, such as one of a series of scribed lines on that other disc.
- an index on one of the cam discs such as an edge of a recess in that disc
- an index on the other cam disc such as one of a series of scribed lines on that other disc.
- An object of the invention is to provide a simple adjustable cam structure having a pair of relatively movable cam discs jointly incorporating a readily detectable indexing means.
- Another object is to provide an adjustable cam incorporating an indexing means presenting to the operator conveniently arranged indicia showing percentile settings of an on-oif cycle of equipment controlled by the cam setting.
- Another object is to provide a timing system controlled by an adjustable cam and incorporating an illuminating means to increase the accuracy of the setting of the cam parts.
- FIG. 1 is a front elevation view of a timing assembly structure employing the adjustable cam.
- FIG. 2 is a side elevation of the structure shown in FIG. 1.
- FIG. 3 is a detail view to a larger scale showing a fragmentary portion of the face of one of the cam discs
- FIG. 4 is a diagrammatic view of a wiring circuit for the timing assembly employing the adjustable cam.
- the adjustable cam of the invention may be employed for any conventional usage made of cams, but by way of illustration and not of limitation is disclosed herein in connection with an electrical timing assembly.
- an electrical timing assembly includes a compact structure embodying a bracket adapted to be mounted upon associated structure (not shown) and within reach of the operator.
- This bracket includes a face plate having a central aperture or window 11 therein and with this aperture preferably being covered by a sheet 12 of translucent material.
- a laterally disposed mounting flange 13 with mounting holes 14 therein is Patented June 13, 1967 offset from the face plate by a wall 15 to give depth to the bracket.
- a timing motor 19 is mounted upon the rear of the bracket and includes a shaft 20 extending through an aperture in the face plate 10 and to which the adjustable cam, now to be described, is suitably attached.
- the composite adjustable cam includes a second cam disc having a generally circular peripheral edge 26 which is interrupted by a notch having a configuration which embodies a chief feature of the present invention.
- This notch which preferably embraces an angle of about has a leading edge 27 which is straight and which extends between the peripheral edge 26 and the bottom 28 of the notch.
- the bottom 28 is concentric with the axis of shaft 20.
- the trailing edge of the notch is serrated and includes a series of straight sighting edges 30, 31, 32, 33, 34, and 36 each of which is located on a radius of the cam disc 25 and is displaced angularly at equal distances from the adjacent such edge.
- the intervening ledges 30A to 35A are concentric with the axis of shaft 20.
- Concentric indicia such as indicated at 37, 38, 39 and 40, are arranged on the face of that cam disc as extensions of the ledges.
- the outermost radial edge 41 is suitably rounded at its junction with the peripheral edge 26 of the cam disc and extending between edges 30 and 41 is an uppermost ledge 41A which likewise is concentric with the axis of shaft 20.
- the cam disc 25 is provided with a hole at its center into which the shaft 20 extends.
- the outer end of the shaft is threaded and engages with a threaded adjusting knob 42 which bears at all times upon a securnig means 43, such as a spring, which is interposed between the knob and the external face of disc 25.
- a first cam disc having a collar 51 embracing shaft 20 and disposed between the face plate 10 and the second cam disc is employed.
- the collar is rigidly afiixed to that shaft.
- the peripheral edge 52 of the first cam disc is generally circular and has a radius corresponding to that of the second cam disc, and is interrupted by a notch having a1eading sighting edge 53.
- This sighting edge is straight, except for a slight rounding at its junction with the peripheral edge 52, lies in a radius of the first cam disc 50, and extends toward the center of the cam disc 50 at least as far as the location of bottom 28 in the notch of the second cam disc 25.
- the shape and location of the trailing edges of the notch in the first cam disc 50 is immaterial, except that the angle embraced between these leading and trailing edges of that notch is at least as great as the angle embraced by the corresponding notch edges in the second cam disc.
- An adjustable cam of the described construction may be used for many control purposes, but in connection with the present invention we incorporate the same in an improved timing assembly as diagrammatically shown in FIG. 4.
- power is supplied to timing motor 19 by conductor through a closed switch 61 and return conductor 62, and a shunt circuit 63 energizes lamp 18.
- the microswitch 16 when closed by its follower riding on the joint peripheries 26 and 52 of the cam discs, energizes a relay 64 which controls a separate circuit leading to the apparatus whose timed cycle of operation is to be governed.
- the knob 42 is loosened and the second cam disc 25 is slowly turned until the sighting edge 34 coincides with edge 53 as indicated by the interruption of light between those respective edges; the knob is then re-tightened to cause spring 43 to compress and to impose a substantial frictional contact between the confronting faces of the two cam discs sufiicient to lock the two parts together. Reclosing of switch 61 then restarts motor 19.
- the light 18 it is not essential to employ the light 18 in certain cases where the operator has close visual access to the cam. In such instances an equivalent accurate setting may be achieved by using a feeler gauge to insure that no space is present between the straight edges being aligned. Also in certain cases the feeler gauge could be used where the operator does not even see the cam.
- An adjustable cam comprising first and second cam discs mounted upon a common axial shaft, said first disc being secured upon said shaft to rotate therewith and having a notch on its periphery including a straight leading edge extending radially toward the axis of said shaft, said second disc being adjustably mounted on said shaft and having a notch on its periphery including a serrated trailing edge; said serrated edge comprising a series of radially disposed straight portions successively displaced angularly of said second disc and separated by ledge portions located on different radial distances from the axis of said shaft, the notch in said first disc embracing an angle at least as great as that of the notch in said second disc whereby said second disc may be adjusted to bring the straight radial portion of any selected serr-ation thereof into alignment with the leading edge of said first disc,
- a timing assembly comprising, a bracket having a window therein, a timing motor mounted on the rear of said bracket and having a shaft projecting from the front of said bracket, a timing cam mounted upon said shaft at the front of said bracket, a light source mounted on the rear of said bracket and adapted to pass light rays through said window, a relay for controlling a separate circuit, a switch mounted upon said bracket for controlling said relay, a source of electrical power connected to said motor, said light, said light and said switch; and a cam follower disposed forwardly of said bracket and cooperating with said cam to open and close the circuit through said switch, said cam having first and second cam discs mounted upon said shaft, said first disc being secured to said shaft and having a notch on its periphery including a straight leading edge extending radially toward the axis of said shaft, said second disc being adjustably mounted on said shaft and having a notch on its periphery including a serrated trailing edge, said serrated edge comprising a series of radially
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Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US481836A US3325610A (en) | 1965-08-23 | 1965-08-23 | Adjustable cam having readily detachable indexing means |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US481836A US3325610A (en) | 1965-08-23 | 1965-08-23 | Adjustable cam having readily detachable indexing means |
Publications (1)
Publication Number | Publication Date |
---|---|
US3325610A true US3325610A (en) | 1967-06-13 |
Family
ID=23913578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US481836A Expired - Lifetime US3325610A (en) | 1965-08-23 | 1965-08-23 | Adjustable cam having readily detachable indexing means |
Country Status (1)
Country | Link |
---|---|
US (1) | US3325610A (en) |
-
1965
- 1965-08-23 US US481836A patent/US3325610A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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None * |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MARYLAND NATIONAL INDUSTRIAL FINANCE CORPORATION Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONTINENTAL FILTER CORPORATION;REEL/FRAME:003927/0801 Effective date: 19811016 Owner name: MARYLAND NATIONAL INDUSTRIAL FINANCE CORPORATION, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CONTINENTAL FILTER CORPORATION;REEL/FRAME:003927/0801 Effective date: 19811016 |
|
AS | Assignment |
Owner name: CONTINENTAL FILTER CORPORATION Free format text: SECURITY INTEREST;ASSIGNOR:CONTINENTAL FILTER CORPORATION;REEL/FRAME:003947/0661 Effective date: 19820130 Owner name: CONTINENTAL FILTER CORPORATION, WISCONSIN Free format text: SECURITY INTEREST;ASSIGNOR:CONTINENTAL FILTER CORPORATION;REEL/FRAME:003947/0661 Effective date: 19820130 |
|
AS | Assignment |
Owner name: CONTINENTAL FILTER CORPORATION A CORP OF OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WEHR CORPORATION;REEL/FRAME:004415/0189 Effective date: 19811016 |