US3025366A - Appliance timer - Google Patents

Appliance timer Download PDF

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US3025366A
US3025366A US745142A US74514258A US3025366A US 3025366 A US3025366 A US 3025366A US 745142 A US745142 A US 745142A US 74514258 A US74514258 A US 74514258A US 3025366 A US3025366 A US 3025366A
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cam
housing
pin
switch
shaft
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US745142A
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Lee A Woolley
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Kingston Products Corp
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Kingston Products Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00Time or time-programme switches providing a choice of time intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/02Details
    • H01H43/022Bases; Housings; Mountings

Description

March 13, 1962 L. A. WOOLLEY 3,025,366
APPLIANCE TIMER Filed June 27, 1958 3 Sheets-Sheet l llb 1 Big-2A 73 73 INVENTOR.
LEE A. WooLLEY ATTORNEYS March 13, 1962 L. A. WOOLLEY 3,025,366
APPLIANCE TIMER Filed June 27, 1958 3 Sheets-Sheet 2 1 m/ 37 40 as /m lTL N 36 37 62 r 64 n H Hg. 4 4o 38 so I I I l 1 1 &
% 66 INVENTOR. LEE A. WOOLLEY fi r 5 BY ATTORNE March 13, 1962 A. WOOLLEY 3,025,366
APPLIANCE TIMER Filed June 27, 1958 3 Sheets-Sheet 3 INVENTOR.
Ell LEE A. WOOLLEY w M 0/4 a, 4
/ ATTORNE United States Patent Ofifice 3,025,366 Patented Mar. 13, 1962 Indiana Filed June 27, 1958, Ser. No. 745,142 17 Claims. (Ci. fill-33) This invention relates generally to an electrical switch structure, and more specifically to an improved multiple circuit switch adapted for use as an appliance timer, and incorporating various novel features therein.
Although the principles of the present invention may be included in various timers, a particularly useful application is made in timers of the type employed to control the various circuits and functions of an automatic washing machine of the domestic type.
The instant invention represents a practical embodiment of a substantial improvement to a timer disclosed in the US. patent to A. R. Constantine No. 2,703,347, issued March 1, 1955. While certain novel features have been disclosed herein, it will be apparent that the problems which they solve are also present in other timers and that such structures may be incorporated in such other timers. Therefore, it is to be understood that the disclosure of certain of the features herein in connection with the Constantine timer is not to be construed as a limitation.
In recent years, an ever increasing number of features and functions have been added to modern automatic washing machines. These functions are normally electrically controlled and operated in accordance with a program of operation established by the washing machine manufacturer. Because of electrical safety requirements, certain minimum size and spacing must be maintained in order to have a satisfactory product, such size and spacing referring to the switch elements thereof. Therefore, a given size timer inherently is more or less limited to controlling a certain number of circuits.
Where a timer includes a face cam having a plurality of concentrically arranged tracks, it is apparent that the innermost or central track will have a somewhat smaller angular movement than will the outer track for a given angular increment of advance. Thus as the tracks become smaller toward the center, their usefulness diminishes. This fact precludes the addition of an infinite or increasing number of tracks toward the center of a face cam to accommodate more circuits. It is also apparent that if a cam is made larger, problems arise such as the lack of space to mount a timer in an appliance, and the scrapping of existing tooling and designs.
Accordingly, it is a principal object of the present invention to provide a timer which is capable of handling a somewhat larger number of circuits than has been done heretofore without sacrificing the spacing and load-carrying characteristics of the switch elements, and without increasing the size of the resulting device.
When a given or basic timer is manufactured for a plurality of washing machine manufacturers, it must be adapted in various ways to accommodate the differing circuit requirements. Some users require a larger number of circuits than do others. Some users require that there be available a greater amount of excess torque than do others, such excess torque being available to positively drive a timer reliably even though binding may be occurring, such as between the selector shaft and the cabinet of the washing machine. Of course, a reduction in number of switches actuated at any given point in the program effects an increase of excess torque at such point in the program. However, such excess torque is not always a blessing. The instant type of timer is one which includes a timing cam which is driven in an intermittent or step by step action, as distinguished from a timer of the type wherein the cam is allowed to continuously creep slowly. Thus the torque which is applied to the timing cam in a timer of this type is only applied periodically. If an excess amount of torque is applied, the timing cam due to its inertia may be caused to advance by an amount greater than that desired, such phe nomenon being referred to in the industry as over-stepping.
Accordingly, it is an object of the instant invention to provide a timer of the intermittent type wherein overstepping is precluded, even though an excess amount of torque is present and available.
It is also an object of the instant invention to provide a means for positively driving an intermittent drive should it hang up or bind in place of fully advancing or stepping the cam.
Certain washing machine control circuits require that they be energized for relatively short periods of time, such as on the order of seconds. However, a typical timer of the stepping type may advance its cam at intervals as long as once every minute or minute and a half.
Accordingly, it is a still further object of the present invention to provide a means whereby a circuit may be intermittently energized for durations shorter than the length of individual cam steps.
Certain automatic washing machines are so constructed that they rely on the energizing of a filling circuit for a predetermined length of time to obtain the proper degree of fill at the beginning of a washing cycle. It is apparent that when washing machines are merchandised in communities which have a water pressure somewhat greater than average, more water will enter a machine during a given period of time than will enter in a community where the water pressure is lower. Still further, some difference in pressure can be expected from various private water systems. Still further, it is desired that a given timer may be able to be used with washing machines having different tub capacities. It is further recognized that some users prefer to use their machines with more or less water than the manufacturer might contemplate.
Accordingly, it is a further object of the present invention to provide a timer which may be present at the factory or by a serviceman to eifect the preferred duration of the filling portion of the-washing program.
Still another object is the provision of a timer wherein the amount of water which it will admit to the machine may be adjusted.
A still further object of the instant invention is the provision of a timer wherein all of the foregoing objects are met.
Yet another object is the circuit switch.
A still further object is the provision of a novel switch detent mechanism.
Another object is the provision of a novel intermittent drive mechanism for a stepping type of timer.
Many other advantages, features and additional objects of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
On the drawings:
FIGURE 1 is a top plan view of an appliance timer assembly provided in accordance with the principles of the present invention;
FIGURE 2 is a side elevational view, partly broken away and sectioned, of the timer shown in FIGURE 1;
FIGURE 2a is a fragmentary sectional detail of a portion of FIGURE 2 shown in elevation;
provision of a novel multiple FIGURE 3 is a view generally similar to FIGURE 1, except that certain parts have been removed or broken away for clarity;
FIGURE 4 is generally similar to FIGURE 2 except that certain parts have been broken away and sectioned for clarity;
FIGURE 5 is generally similar to FIGURE 4, but with components thereof in a different relative position;
FIGURE 5a is a fragmentary portion of FIGURE 4 having a slightly modified lower switch blade;
FIGURE 6 is generally similar to FIGURES 1 and 3, but with certain parts removed and broken away for clarity;
FIGURES 7 and 8 illustrate the operation of a portion of FIGURE 6; and
FIGURES 9 and 10 illustrate the operation of a portion of FIGURES 1 and 2.
As shown in the drawings:
The principles of this invention are particularly useful. when embodied in a multiple switch or timer assembly such as illustrated in FIGURE 1, generally indicated by the numeral 10. The timer assembly includes as best seen in FIGURE 2, a housing 11, a program timing or sequence cam 12, a plurality of electrical switches such as 13, a motor 14, and an intermittent drive mechanism for the timing cam, generally indicated by the numeral 15.
The housing 11 preferably comprises molded plastic from which two identical housing halves are made which jointly define a cavity 16 therein. One of the housing halves is indicated by the numeral 11a and the other housing half is indicated by the numeral 11b. The housing not only encloses the switches 13, but also serves as a support for each of the various parts presently to be described. The housing half 11a includes a plurality of pads 17 which jointly define a plane adjacent to one side of the timing cam 12, and which plane is normal to the rotational axis of the cam 12. A spring 18 acts between the housing 11 and the timing cam 12 to urge the cam 12 with a force against the pads 17. Thus the pads 17 define a plane which serves as a locating reference for the timing cam 12.
The timing or sequence cam 12 is a disc-like member disposed within the cavity 16 for rotation within the housing. The cam 12 is provided with a plurality of ratchet teeth 19 on its outer periphery, and a plurality of cam tracks 20, 21 as best seen in FIGURE 6, and which tracks are arranged to be circular or arcuate and concentrically disposed and radially spaced with respect to each other. The tracks may be provided on either or both of the faces of the cam 12, and subject of course to their rises or falls, each lies in a common plane on each side of the cam 12. The cam 12 is provided with a manual selector shaft 22 which is rotatably carried by the housing 11 coaxially with the cam 12. The details of the shaft 22 are described later herein.
The electric switches 13 are disposed within the housing 11 adjacent the cam tracks such as and 21, so that the switches 13 may be opened and closed in response to rotation of the timing cam. The switches 13 include electrical contacts which are adapted such as by terminals 23 for connection into an appropriate circuit of the appliance to be controlled, such as a washing machine circuit. It will be noted that the representative switch 13 shown in FIGURE 2 comprises a double-throw switch, and accordingly the associated cam track has three levels whereby one stationary contact, the other stationary contact, or neither of the stationary contacts is engaged by the movable contact thereof. It will be appreciated later herein that regardless of the angle between the shaft 22 and the timing cam 12, the timing cam 12 will rotate about an axis perpendicular to the plane defined by the pads 17, whereby any runout between the cam 12 and the shaft 22 will not elfect a false switch movement. Heretofore, false switch movements of as much as .020 inch have been commonplace and have precluded the use of double-throw switches, while in the instant embodiment, such false movement has been substantially eliminated, thereby rendering the use of double-throw switches practical for the first time in this environment.
The motor 14 is secured to the housing 11 such as by a motor mounting plate 24. Bolt and nut sets 2S28 secure the two housing halves 11a, 11b together and also extend through the motor mounting plate 24. The plate 24 is slotted as at 29 and pivoted about the axis of the bolt 27 whereby the motor 14 and plate 24 may be angularly adjusted with respect to the housing 11 in a lateral direction. It is thus apparent that the motor 14 is offset from the cam 12. The plate 24 supports a portion of the intermittent drive mechanism 15 beneath a cover 36 which has an integral car 31 which extends under a lug 32 which is integral with the plate 24. The cover 35} also has a pair of ears 33, 33 which extend through slots in the motor mounting plate 24 and then are bent over, as best seen in FIGURE 4.
Referring now to FIGURES 3 and 4, it can be seen that the motor 14- has an output shaft 3 extending through the mounting plate 24, the rotational axis of which shaft is parallel to the rotational axis of the timing cam and spaced radially therefrom. shaft 34 carries a pinion 35, such as by press fit, and which pinion meshes with a gear member as rotatably supported by the plate 24. It is apparent that the rotational axis of the gear member 36 is likewise parallel to the rotational axis of the timing cam 12 and spaced radially therefrom. Thus the member 36 is rotatably driven by the output shaft 34 of the motor 14. The member .16 has an axially directed cam track having a rise and fall indicated by the numeral 37, best seen in FIGURE 4-. A lever 38 has one end thereof 39 in engagement with the track 3'7 for a purpose explained later herein.
The member as has a pin 46 which comprises a part. of the intermittent drive mechanism 15. The mechanism 15 includes a spring loading and releasing device having the pin it), a bell crank lever 41, and a torsion spring 42.
The pin 49 is rotatable about a first axis 43 which is radially spaced from and parallel to the axis of the pin 40. Thus the pin 4% is rotatable about an axis remote from itself. Further, the pin 40 is disposed parallel to and off-set from the axis of the output shaft 34. Since the pin 41? is securely attached to the member 36, the pin 49 is provided with a driving connection to the out put shaft 34.
The bell crank lever 41 is pivotally supported by the housing 11 for rocking about a second axis axis 44 is also radially spaced from the timing cam 12 and is parallel to both the first axis 43 and the pin 4%. The bell crank lever 41 includes a pair of arms 45 and 46. One of the arms 45 has a cam surface 47, 49 which defines an opening 56' in the arm 45. The cam surface 47-49 is engaged by the pin 4d of the member 36.
The other arm 4a of the bell crank lever 41 may be termed a drive member and is arcuatcly reciprocable in response to the rocking of the arm 45 by tle rotation of the pin 40. The other arm 46 has a pawl 51 pivotably secured thereto, while a spring 52 acting between the pawl 51 and the arm 46 is disposed therebctwecn to urge the pawl 51 against the ratchet teeth 19. The pawl 51 has a. stop ear 53 which engages a semiperforation or lug 54 on the bell crank lever arm 46. The spring 52 effects such engagement when the pawl 51 is slightly spaced from the roots of the peripheral teeth 19 of the cam 12.
The torsion spring 42 acts between and engages the bell crank lever 41 and an ear 55 integrally extending from the motor mounting plate The cam surfaces 47 and 49 each represent gradual cam rises, which confront each other. The cam surface 47 is engaged by the pin as shown in 8 to wind up the spring 42, thereby storing energy therein.
When the pin 4t? of the member 36 reaches the cam sur-- face 48 which may be termed a fall, the spring 4-2 unwinds forcing the cam surface 48 to act against the pin 40 and effecting somewhat faster relative movement therebetween. The fall 48 is arcuate in configuration and has a geometric center which is offset from the axis 44 of the bell crank lever 41 by a distance of about inch. Thus the fall 48 does not permit free unwinding of the spring together with substantially instantaneous movement of the bell crank 41, but rather effects a retarded advance wherein the torque present in the spring is fully present, but where the components are accelerated at a slightly retarded rate so as to preclude overstepping due to inertia of the cam 12. In the event that the bell crank lever should bind, or in the event that the spring 42 would fail to return the bell crank 41 to the position shown in FIGURE 6, then the pin 44 will engage the other gradual cam rise 49 to positively drive the lever 41, and thereby positively advance the cam 12. Thus means are provided for the motor 14 to positively drive the spring loading and releasing device mechanism 15.
When the pin 40 drives the arm 45 from the position shown in broken lines in FIGURE 7 to a point slightly beyond that shown in FIGURE 8, the pawl 51 pivots slightly clockwise as shown with respect to the arm 46, while the bell crank lever pivots counterclockwise about the axis 44. The amount of movement which is effected is suficient for the pawl 51 to slip over at least one tooth 19 on the periphery of the cam 12, to thereafter advance the cam 12 by an increment of one tooth. The adjustment effected by the slot 29 in the motor mounting plate 24 also permits a slight rocking of the bell crank lever 41 and the pawl 51 with respect to the cam 12 in order to effect the proper alignment or coordination between the switches 13, the cam 12, and the intermittent drive mechanism 15.
It is thus apparent that the motor 114 plus the drive mechanism jointly comprise a means for electrically rotating the timing cam 12, incrementally.
The lever 38, as best seen in FIGURES 3-5, which has an end 39 engaging the axially directed rise and fall 37 on a face of the member 36, is supported by a. bracket 56 secured to the housing 11. The bracket 56 has a pair of aligned slots 57, 58 in which the lever 38 is disposed. The slot 57 has an edge 59 which engages the lever 38 intermediate its ends as a fulcrum, while the other slot 58 is defined by a pair of shoulders between which the lever 33 is disposed and guided for vertical movement as shown. The other end 6! of the lever 33 is angularly disposed and extends through an opening in the plate 56 freely. An additional switch 61 disposed and supported within the housing 11 is operated by a plunger 62 which is slidably supported in the housing If, and which is urged outwardly by one of the spring elements, which spring element is urged inwardly by rocking move ment of the lever 33.
Thus the member 36 may have an operating speed of one revolution perminute, for example, and two sets of rises and falls 37, whereby the switch 61 may be opened and closed twice, for each time that the pin 4% of the member 36 makes one revolution. Thus the switch 61 may be actuated a number of times while the timing cam 12 has remained stationary. Of course, the switch 61 is connected in a circuit through another switch so that the intermittent cycling of the switch 61 at a relatively rapid rate occurs only electrically when called for otherwise. The blade 63 of the switch 61 is yieldably biased in an upward direction against a stop blade 64, best seen in FEGURE 4. When the plunger 62 is urged inwardly, the blade 63 is not only engaged by the movable blade 65 but is also caused to move off the stop blade 64.
Referring now to FIGURE So, there is shown a slightly modified form of switch 61 wherein the blade 63 and stop blade 64 have been replaced by a contact blade 66 which is biased in the opposite direction against one of the tracks of the cam 12. By this structure, the switch 6 is under the joint control of the cam 12 and the lever 33, and the need for connecting the switch in series with another is obviated. The switch 61 is particularly useful for actuating a rinsing circuit, such as a spray rinse.
The manual selector shaft 22 rotatably supported by the housing 11, generally coaxial and corotatably associated with the timing cam 12 comprises a further means for manually rotating the timing cam 12. As best seen in FIGURE 2, the shaft 22 has an integral end portion 67 which extends outwardly of the housing for manual manipulation or for receiving a knob thereon. The shaft 22 includes an intermediate portion best seen in FIGURE 2a at 68 which engages the timing cam 12. The shaft 22 also has a first abutment means or a detent pin 69 and a switch actuating member 70 fixedly secured to the shaft within the housing.
The intermediate portion 68 of the shaft 22 is adapted in any convenient manner, along with the timing cam 12, so that they are freely coupled together for driving corotation, for relative axial translation, and to permit a sli ht angular wabble between the axis of the shaft and the rotational axis of the timing cam, such wabble having a magnitude depending upon the degree which these axes do not coincide angularly precisely. In the instant embodiment, the cam 12 has an aperture 71 through which the shaft portion 63 extends, and which is axially slotted as at '72, 72 to receive in each slot an ear 73, 73 which has been formed on opposite sides of the portion 68, as by coining.
An additional switch having a blade 74 has been provided adjacent to the switch actuating member 70, the blade 74 being operative in response to axial movement of the shaft 22 whereby the actuating member 70 engages and displaces the blade 74. By this structure, a switch is provided which may be used as a master switch and which is disposed inwardly of the smallest diameter useful cam track 20. Heretofore, in this type of timer, it has not been possible to shift the shaft axially whereby a somewhat more complex mechanism was necessary to effect a switching action responsive to axial movement of the knob. Typically, it has been heretofore necessary to provide a sleeve over the portion 67 which thereby in creases the hole size which must be provided in a washing machine cabinet to receive the shaft 22. Such an increase in size has been objected to by the users of earlier forms of timers and it can be seen that the instant structure in providing a shaft 22 which is substantially uniform throughout its entire length obviates the need for any such accommodation change.
The shaft 22 is further provided with a detent structure generally indicated at 75 whereby the shaft is positively held in either an axial inward or outward position wherein the blade 74 is either positively held open or positively held in closed electric circuit. The details of the instant detent are disclosed in a copending application of Ice Bowman, entitled Detent filed in the United States Patent Oflice on May 15, 1958, U.S. Serial No. 735,482, now US. Patent No. 2,940,333.
The selector shaft 22 is also provided with an angularly adjustable detent structure generally indicated by the number 76 and best seen in FIGURES l, 9 and 10. The detent pin 69 comprises a first abutment means which is fixedly secured in the shaft 22 for rotation therewith, and extending radially therefrom. The detent pin 69 is disposed adjacent to a plate '77 which is supported by the housing adjacent to the detent pin 69 and the bracket 56. The plate 77 has a second abutment means or blocking shoulder '78 which is positionable to engage the detent pin 69 at various predetermined positions in a plane parallel to the rotational path of the detent pin. More specifically, the plate 77 is positionable in various predetermined positions in a plane parallel to the rotational path of the detent pin 69, and to this end is provided with at least one slot 79 through which a mounting screw extends. Thus the plate 77 with its blocking shoulder '78 may be rotated about the shaft 22 and locked in position. The bracket 56 is provided with an index 81 while the plate 7'7 is provided with a plurality of indices 82 for indicating various relative positions. In the preferred form of the instant invention, the spaces or indices 32 represent different levels to which a Washing machine tub may be filled, or represent difierent periods of time which water is permitted to flow into the tub of the washing machine.
The blocking shoulder 73 thus extends into the rotational path of the detent pin 69 for interengagement therewith at a preselected or predetermined position.
The particular cam track which controls filling is so disposed with respect to the filling switch 13 at the end of a washing cycle, that the switch 13 is open. Manual rotation or advancement of the knob is there after required to initiate the next washing program or repetition of the same. The shaft is thus manually rotated until the detent pin engages the blocking shoulder 78. Upon the slightest rotation, the filling switch 3 becomes closed so that filling of the machine with water is thereby immediately initiated. Thus, if the plate 77 be set to one extreme, namely so that the plus index is adjacent to the index 831, substantially the entire cam track 29 will be traversed during the filling portion of the washing cycle. However, if the minus index is placed in line with the index 81, a minimum amount of time remains during which the filling cam track 2% holds the filling switch 1% closed.
When the pin 69 engages the blocking shoulder 78, a definite feel is transmitted to the hand of the person advancing the timer. At this point, the shaft may be shifted axially so that the pin 69 clears the blocking shoulder 78 and so that the switch 74 is closed to initiate the washing program. However, it is not necessary that the shaft 22 be shifted or shiftable in utilizing the structure disclosed for the plate 77 and the blocking shoulder 78. it will be noted that the blocking shoulder 78 is disposed on the end of a finger like projection 83 integrally forming a part of the plate 77. Since the pin 69 has a circular cross-section, it cams the shoulder 78 downward causing the finger-like portion 83 to deflect as shown in FIGURE 10, thereby releasing the detent pin 69. Thus while the instant structure discloses means whereby both the shaft 22 and the pin 69 as Well as the blocking shoulder 78 may be shifted, it is to be understood that an advantageous structure can be obtained where only one of these members is shiftable. Thus either or both abutments are movable in a direction perpendicular to the rotational path of the detent pin 69 to allow rotation of the selector shaft 22 past a point of resistance or blocking. It will be noted that in this embodiment, the housing ll. has standofi's 84, 35 to which the bracket 56 and plate 57 are secured. The corresponding standoifs of the other housing half lln provide a means for attaching the timer to the appliance.
Although various minor modifications might be suggested by those versed in the art, it should be understood that I wish to embody within the scope of the patent warranted hereon all such embodiments as reasonably and properly come Within the scope of my contribution to the art.
I claim as my invention:
1. A multiple switch mechanism for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, having ratchet teeth on the periphery thereof, and having a plurality of radially spaced circular cam tracks on at least one face thereof; a plurality of electric switches disposed within said housing adjacent to said timing cam and adapted for connection in said circuits and each being opened and closed for a predetermined time duration by the rotation of said timing cam; a motor fixed to said housing and having an output shaft rotatable on an axis spaced radially of the axis of rotation of said timing cam; a
pin disposed parallel to and offset from said shaft axis, and having driving connection with said shaft for being rotated about an axis remote from said pin; and a spring loaded bell-crank lever having a pair of arms pivoted about an axis radially spaced from said timing cam, one of said arms having a cam surface with a gradual rise and an arcuate fall, said fall having a geometric center offset from said lever-axis, the other of said arms having a spring held actuating pawl in contact with said ratchet teeth, said pawl being retracted at least one tooth upon the rotation of said pin against said cam surface rise followed by a retarded advance of said timing cam through a predetermined are upon the engagement of said pin with said arcuate cam surface fall.
2. An intermittent drive mechanism for reciprocating a drive member, comprising: a pin supported for continual driven rotation in a single direction about a first axis radially spaced from and parallel to said pin; a bell crank lever pivotally supported about a second axis radially spaced from and parallel to said first axis and said pin, said lever having a pair of arms, one of said arms having a cam surface with a gradual rise and a somewhat faster fall for being engaged by said pin, and the other of said arms being adapted to comprise said drive member; and a spring engaging said lever and adapted to receive and store energy when said pin engages said gradual cam rise, and to release energy when said pin engages said fall.
3. An intermittent drive mechanism for reciprocating a drive member, comprising: a pin supported for driven rotation about a first axis radially spaced from and parallel to said pin; a bell crank lever pivotally supported about a second axis radially spaced from and parallel to said first axis and said pin, said lever having a pair of arms, one of said arms having a cam surface with a gradual rise and an arcuate fall for being engaged by said pin, said fall having a geometric center offset from said second axis, and the other of said arms being adapted to comprise said drive member; and a spring engaging said lever and adapted to receive and store energy when said pin engages said gradual cam rise, and to release energy when said pin engages said fall.
4. An intermittent drive mechanism for reciprocating a drive member, comprising: a pin supported for driven rotation about. a first axis radially spaced from and parallel to said pin; a bell crank lever pivotally supported about a second axis radially spaced from and parallel to said first axis and said pin, said lever having a pair of arms, one of said arms having an opening defined by a cam surface for being engaged by said pin, said cam surface having a pair of spaced confronting gradual rises and a somewhat faster fall, and the other of said arms being adapted to comprise said drive member; and a torsion spring engaging said lever and adapted to be wound when said pin engages one of said gradual cam rises, and to unwind when said pin engages said fall, whereby should said spring fail to unwind, said pin will engage the other of said gradual cam rises to positively drive said lever.
5. A multiple switch mechanism for controlling the opening and closing of a plurality of circuits at predetermined time intervals and in predetermined sequence comprising, a rotatable disc-like sequence timing cam having a plurality of concentrically disposed radially spaced cam tracks in a common plane on each of the opposite sides thereof and having ratchet teeth on the outer periphery thereof, contacts arranged for connecting in circuits and opened and closed by the rotation of said sequence cam, a motor disposed offset relative to said cam, a spring, and a spring loading and releasing device operated by said motor and coacting with the ratchet teeth of said cam for advancing said cam in predetermined increments, said loading and releasing device including means by which said motor will positively drive said device in a releasing manner if the spring thereof should fail to release, thereby advancing said cam.
6. A multiple switch mechanism for controlling the opening and closing of a plurality of circuits in predetermined sequence comprising in combination: a plurality of contacts arranged for connecting in circuits and adapted to be opened and closed; a sequence cam having a plurality of tracks for opening and closing the contacts upon rotation thereof; a rotatably supported axially slidable shaft adapted to rotate said cam; a pin fixedly secured to said shaft for rotation therewith and extending radially therefrom; and a plate having a blocking shoulder supported by a yieldable resilient portion of said plate and disposed in the horizontal path of said pin for engagement therewith; said pin and said shoulder being each movable in a direction perpendicular to said rotational path to allow rotation of said shaft.
7. A detent structure comprising: a rotatably supported axially slidable shaft; a pin fixedly secured to said shaft for rotation therewith and extending radially therefrom; and a plate having a blocking shoulder supported by a yieldable resilient portion of said plate and disposed in the rotational path of said pin for engagement therewith; said pin and said shoulder being each movable in a direction perpendicular to said rotational path to allow rotation of said shaft.
8. An adjustable detent structure comprising: a support; a shaft rotatably carried therein; a pin fixedly secured to said shaft for rotation therewith and extending radially therefrom; and a plate carried by said support and adapted to be selectably disposed in various fixed positions in a plane parallel to the rotational path of said pin, said plate having a blocking shoulder positionable in the rotational path of said pin for engagement therewith; at least one of said pin and said shoulder being movable in a direction perpendicular to said rotational path to allow rotation of said shaft.
9. A multiple switch mechanism for controlling the opening and closing of a plurality of circuits, including a first circuit, in predetermined sequence and at timed intervals comprising in combination: a housing, a plurality of contacts supported by said housing and arranged for connecting in said circuits and adapted to be opened and closed; a motor-driven program cam having a plurality of tracks for opening and closing the contacts upon rotation thereof; a manually rotatable selector shaft carried in said housing and adapted to rotate said cam for prepositioning thereof; a detent pin fixedly secured to said selector shaft for rotation therewith and extending radially therefrom; and a plate carried by said housing and adapted to be disposed in various predetermined positions in a plane parallel to the rotational path of said detent pin, said plate having a blocking shoulder positionable in the rotational path of said detent pin for engagement therewith at a point where the track of said program cam for the contacts of said first circuit will hold the contacts of said first circuit closed for a selected length of time, at least one of said detent pin and said shoulder being movable in a direction perpendicular to said rotational path to allow rotation of said selector shaft.
10. A multiple switch mechanism for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, and having a plurality of radially spaced circular cam tracks on at least one face thereof; a plurality of electric switches disposed within said housing adjacent to said timing cam and adapted for connection in said circuits and each being opened and closed for a predetermined time duration by the rotation of said timing cam; a motor fixed to said housing and having an output shaft rotatable on an axis parallel to the rotational axis of said timing cam and spaced radially therefrom; means driven by said output shaft for rotating said timing cam and operative on the periphery thereof, said means including a member rotatably driven by said shaft and having an axially directed cam rise and fall on a face thereof; a lever pivotally supported intermediate its ends with respect to said housing, one end of said lever being engageable with the axially directed cam rise and fall of said member; and an additional switch supported by said housing and adapted for connection into a circuit, said switch being under the control of the other end of said lever.
11. A multiple switch mechanism for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, and having a plurality of radially spaced circular cam tracks on at least one face thereof; a plurality of electric switches disposed within said housing adjacent to said timing cam and adapted for connection in said circuits and each being opened and closed for a predetermined time duration by the rotation of said timing cam; a motor fixed to said housing and having an output shaft rotatable on an axis parallel to the rotational axis of said timing cam and spaced radially therefrom; means driven by said output shaft for rotating said timing cam and operative on the periphery thereof, said means including a member rotatably driven by said shaft and having an axially directed cam rise and fall on a face thereof; and a lever pivotally supported intermediate its ends with respect to said hous ing, one end of said lever being engageable with the axially directed cam rise and fall of said member, one of said switches being under the further control of the other end of said lever.
12. A multiple switch mechanism for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, and having a plurality of radially spaced circular cam tracks on at least one face thereof; a plurality of electric switches disposed within said housing adjacent to said timing cam and adapted for connection in said circuits and each being opened and closed for a predetermined time duration by the rotation of said timing cam; a motor fixed to said housing and having an output shaft rotatable on an axis parallel to the rotational axis of said timing cam and spaced radially therefrom; means driven by said output shaft for rotating said timing cam and operative on the periphery thereof, said means including a member rotatably driven by said shaft and having an axially directed cam rise and fall on a face thereof; a lever having one end engageable with the axially directed cam rise and fall of said member; a bracket secured to said housing and having a pair of generally aligned slots receiving said lever, one edge of one of said slots engaging said lever intermediate its ends as a fulcrum, and the other of said slots serving as a guide for the other end of said lever; and an additional switch supported by said housing and adapted for connection into a circuit, said switch being under the control of said other end of said lever.
13. A multiple switch mechanism for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, and having at least one circular cam track on an axially directed face thereof; a double throw switch within said housing adjacent to said timing cam face and adapted for connection in said circuits, said switch being opened and closed in response to the rotation of said timing cam track; a unitary manual selector shaft supported by said housing generally coaxially with said timing cam, said shaft and said cam being freely directly coupled together in a manner to permit both driving corotation, relative axial translation, and slight angular wabble between their axes; said housing having a stationary means defining a stationary plane adjacent to peripheral portions of one side of said rotatable cam and normal to the rotational axis thereof; and a spring acting between said housing and said rotatable cam and continually urging said peripheral portions of said rotatable cam against said stationary plane-defining means.
14. A multiple switch mechanism for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, and having at least one circular cam track on a face thereof; an axially directed double throw switch within said housing adjacent to said timing cam face and adapted for connection in said circuits, said switch being opened and closed in response to the rotation of said timing cam track; means supported by said housing for rotating said timing cam; said housing having a stationary means defining a stationary plane adjacent to peripheral porions of one side of said rotatable cam and normal to the rotational axis thereof; and a spring acting between said housing and said rotatable cam and continually urging said peripheral portions of said disc-like cam directly against said stationary plane-defining means.
15. A multiple switch mechanism. for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, and having a plurality of radially spaced circular cam tracks on at least one face thereof; a plurality of electric switches disposed within said housing adjacent to said timing cam and adapted for connection in said circuits and each being opened and closed in response to the rotation of said timing cam tracks; a unitary manual selector shaft supported by said housing generally coaxially with said timing cam, said shaft having an integral end portion extending outwardly of said housing for manual manipulation and having an intermediate portion directly engaging said timing cam, said intermediate portion and said timing cam being adapted to permit both driving corotation and relative axial translation; a switch actuating member fixedly secured to said shaft within said housing; an additional switch disposed adjacent to said actuating member and operative in response to axial movement of said shaft; said housing having a means defining a plane adjacent to peripheral portions of one side of said cam and normal to the rotational axis thereof; and a spring acting between said housing and said cam and continually urging said disc-like cam directly against said plane-defining means.
16. A multiple switch mechanism for use with a plurality of circuits, comprising: a housing; a disc-like rotatable timing cam within said housing, and having a plurality of radially spaced circular cam tracks on at least one face thereof; a plurality of electric switches disposed within said housing adjacent to said timing cam and adapted for connection in said circuits and each being opened and closed in response to the rotation of said timing cam tracks, at least one of said switches comprising a double throw switch; a unitary manual selector shaft supported by said housing generally coaxially with said timing cam, said shaft having an integral end portion extending outwardly of said housing for manual manipulation and having an intermediate portion directly engaging said timing cam, said intermediate portion and said timing cam being freely coupled together in a manner to permit both driving corotation, relative axial translation, and slight angular wabble between their axes; a switch actuating member fixedly secured to said shaft within said housing; an additional switch disposed adjacent to said actuating member and operative in response toaxial movement of said shaft; said housing having a means defining a plane adjacent to peripheral portions of one side of said cam and normal to the rotational axis thereof; and a spring acting between said housing and said cam and continually urging said disc-like cam directly against said plane-defining means.
17. A multiple switch mechanism for controlling the opening and closing of a plurality of circuits including a first circuit, in predetermined sequence and at timed intervals comprising in combination: a housing; a disclike rotatable timing cam within said housing, having ratchet teeth on the periphery thereof, and having a plurality of radially spaced circular cam tracks on at least one face thereof; a plurality of electric switches disposed within said housing adjacent to said timing cam and adapted for connection in said circuits and each being opened and closed for a predetermined time duration by the rotation of said timing cam, at least one of said switches comprising a double throw switch; a motor fixed to said housing and having an output shaft rotatable on an axis parallel to the rotational axis of said timing cam and spaced radially therefrom; a member rotatably driven by said output shaft and having an axially directed cam rise and fall on a face thereof; a pin supported by said member for driven rotation about a first axis radially spaced from and parallel to said pin; a bell crank lever pivotally supported about a second axis radially spaced from and parallel to said first axis and said pin, said lever having a pair of arms, one of said arms having an opening de fined by a cam surface for being engaged by said pin, said cam surface having a pair of spaced confronting gradual rises and a somewhat faster fall, said faster fall having a geometric center offset from said second axis, and the other of said arms being adapted to drivingly engage said ratchet teeth; a torsion spring engaging said lever and adapted to be wound when said pin engages one of said gradual cam rises, and to unwind when said pin engages said fall, whereby should said spring fail to unwind, said pin will engage the other of said gradual cam rises to positively drive said lever; a lever having one end engageable with the axially directed cam rise and fall of said member; a bracket secured to said housing and having a pair of generally aligned slots receiving said lever, one edge of one of said slots engaging said lever intermediate its ends as a fulcrum, and the other of said slots serving as a guide for the other end of said lever; an additional switch supported by said housing and adapted for connection into a circuit, said switch being under the control of said other end of said lever; a manual selector shaft supported by said housing generally coaxilly with said timing cam, said shaft having an integral end portion extending outwardly of said housing for manual manipulation, and having an intermediate portion engaging said timing cam, said intermediate portion and said timing cam being freely coupled together in a manner to permit both driving corotation, relative axial translation, and slight angular wabble between their axes; a switch actuating member fixedly secured to said shaft within said housing; an additional switch disposed adjacent to said actuating member and operative in response to axial movement of said shaft; said housing having a means defining a plane adjacent to one side of said cam and normal to the rotational axis thereof; a spring acting between said housing and said cam for urging said cam against said plane-defining means; a detent pin fixedly secured to said selector shaft for rotation therewith and extending radially therefrom; and a plate carried by said housing and adapted to be disposed in various predetermined positions in a plane parallel to the rotational path of said detent pin, said plate having a blocking shoulder positionable in the rotational path of said detent pin for engagement therewith at a point where the track of said timing cam for the switch of said first circuit will hold the switch of said first circuit closed for a selected length of time, at least one of said detent pin and said shoulder being movable in a direction perpendicular to said rotational path to allow rotation of said selector shaft.
References (liter! in the file of this patent UNITED STATES PATENTS
US745142A 1958-06-27 1958-06-27 Appliance timer Expired - Lifetime US3025366A (en)

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