Abstract: A hand dryer timer assembly including a plate with a timer motor mounted on one side of the plate and a switch mounted on an opposite side of the plate. The switch is in electrical communication with, and controls the operation of, the timer motor. A cam is mounted on a drive shaft of the timer motor such that the cam rotates with the drive shaft and also slides longitudinally over the drive shaft. The cam extends through an opening in the plate and has a flange at one end located adjacent the one side of the plate to prevent the one end of the cam from moving past the one side of the plate. The cam further has a cam lobe located on the opposite side of the plate adjacent an actuating arm of the switch. A biasing element is located between the timer motor and the cam and biases the cam to a first position aligning the cam lobe with the actuating arm of the switch.

Abstract: An appliance timer has features to facilitate automated assembly or manual assembly. A timer housing base accepts timer components from two directions, and installation of components in either direction is along a straight axis. A motor in the timer engages a gear train which runs a drive cam. The drive cam imparts motion to a camstack which then engages timer blade switches, and the blade switches operate the appliance. A subinterval is also supplied on the timer to allow periodic operation of a switch without the use of the camstack. The timer also features a quiet manual advance which removes the blade switches from communication with the camstack to allow an operator to select various timer programs without any of the clicking noises that are usually associated with timer program selection. Furthermore, a detent slider is positioned in communication with the camstack to provide a tactile feel for the operator of the timer when selecting between various timer programs.

Abstract: The drive train of an appliance timer includes a slip clutch formed of a triangular spring meshing with the outer flat surfaces of a hexagonal drive shaft. The slip clutch is incorporated into a drive pinion in the appliance timer drive train. Excessive torque causes the walls of the triangular spring to resiliently bend outward under rotational pressure from the drive shaft, permitting the drive shaft to rotate without rotating the drive pinion. When used in an icemaker, the slip provided by the clutch alleviates the need for an expensive, stallable motor.

Abstract: An appliance timer has features to facilitate automated assembly or manual assembly. A timer housing base accepts timer components from two directions, and installation of components in either direction is along a straight axis. A motor in the timer engages a gear train which runs a drive cam. The drive cam imparts motion to a camstack which then engages timer blade switches, and the blade switches operate the appliance. A subinterval is also supplied on the timer to allow periodic operation of a switch without the use of the camstack. The timer also features a quiet manual advance which removes the blade switches from communication with the camstack to allow an operator to select various timer programs without any of the clicking noises that are usually associated with timer program selection. Furthermore, a detent slider is positioned in communication with the camstack to provide a tactile feel for the operator of the timer when selecting between various timer programs.

Abstract: An appliance timer includes a cam member and a first coupler attached to the cam member, the first coupler having a structure with a notch defined therein, wherein the structure defines a substantially cylindrical member having a void defined therein. The appliance timer also includes a knob shaft and a second coupler attached to the knob shaft and positioned within the void, wherein (1) the second coupler includes a body and a tab, (2) the tab is movable in relation to the body, (3) the body is fixed in relation to the knob shaft, and (4) the tab is positionable within the notch.

Abstract: An electrical timer is provided having an electrical motor connected to a first geneva drive gear via a gear train. The geneva drive gear engages a geneva wheel and is coupled to a cam via a clutch joining the geneva wheel and the cam. The clutch may provide a plurality of indexable operating positions wherein each operating position is angularly displaced from adjacent operating positions by a distance equal to the angular distance between adjacent cusps.

Abstract: A microwave oven includes a magnetron for performing a microwave cooking function, and a separate electric heater element for performing a grilling function. A single control knob on a control panel serves to activate the magnetron and heater element, as well as selecting an output power of the magnetron. By actuating that single knob a user can select cooking operations solely by microwaves only, or solely by the heating element, or by a combination of both. A separate knob on the control panel enables a cooking time to be selected.

Abstract: A programmer/timer for appliances having cam actuated switches with a cam drum advanced by a motor driven four-stage speed-reducing gear train with a missing teeth type intermittent device. The third step gear is readily interchangeable for changing the rate of cam advance. An auxiliary housing with auxiliary cam drum and switches may be added without altering the basic configuration of switches and advance mechanism.

Abstract: A dial-type timer device having a timer body and a dial on a face of the timer body. A cover, including a locking pawl, is placed on the face of the timer body so that the dial protrudes through a hole therein. A setting ring is mounted on the dial and engages the locking pawl at a selected location to repeatedly set the time. Alternatively, two setting rings, each including a tooth on its outer periphery, are mounted on the dial to limit the range of rotation of the dial. Also, in a timing circuit of the timer, a dummy resistor of substantially the same impedance as an output relay, with its own switching element is connected in series with the output relay. By switching current alternatively through the output relay and the dummy resistor, fluctuation of current in the circuit is minimized and stable power is supplied to the time-limit circuit.

Abstract: A torque limiting drive and programmer/timer using same. A motor drives a driving member which has drive lugs engaging the central web of a plural-armed wave spring. The wave spring arms frictionally engaged radially oppositely facing annular friction surfaces on a driven member, which in a programmer/timer is the program cam, which upon rotation of the cam is operative for sequentially actuating electrical switches. User rotation of the cam when the motor is not operative allows the wave spring arms to slip against the annular friction surfaces permitting the user to position the cam as desired.

Abstract: An electromechanical appliance programmer has a cam drum indexed by primary advance motor drive for sequentially operating plural appliance function switches. The cam shaft is axially slidable by user actuation and moves an annular cam ring for moving a slider for actuating and de-actuating a line power switch. An internally-toothed gear is attached internally to the cam drum web and is engaged by a drive pinion of a second motor drive for effecting rapid advance of the cam drum.

Abstract: An anti-rotational device for a cam-operated timer is used in appliances with timer control knobs that recess when the appliance is operating. A spring biased axially displaceable shaft that carries a circular disc having teeth peripherally disposed around its circumference is provided. When the shaft is axially displaced by pressure on the timer control knob, the teeth on the circular disc engage raised tabs on the timer's housing, and the engagement prevents the shaft from rotating.

Abstract: A uni-direction rotation device in a cam-operated timer is accomplished by coupling the timer control shaft to the camstack with a semi-circular tang and semi-circular slot connection. When the timer control knob is rotated in the biased or right direction, the slot is coupled to the tang, and the timer can be set. But when the timer control knob is rotated in the unbaised or wrong direction, the slot is uncoupled from the tang and the timer control knob rotates freely, so the timer cannot be set.

Abstract: A electromechanical programmer with smooth program preselection having a rotating main cam unit for executing several operating programs, a first cam for allowing step passage with the main cam unit driven in rotation by a micromotor through a speed reduction system, and a second cam for smooth program preselection. The programmer comprises a retractable mechanical drive device for assuring a mechanical connection between the rotating main cam unit and first cam for allowing step passage under a control of the second cam for smooth program preselection.

Abstract: A timing mechanism has a segmented shaft one segment of which carries a camstack while the other segment carries a drive member coupled to an actuator for a momentary switch. The actuator is coupled to the drive member such that the shaft is free to rotate independent of the actuator, with the actuator being restrained from rotation. The actuator moves axially in response to movement of the drive member to open and close the momentary switch. A positive snap action breaking of the electrical contacts of the momentary switch is achieved by holding the movable electrical contact of the switch to the actuator so that it positively disengages from the other contact when the actuator is positively indexed.

Abstract: A programmer for an appliance having a single timing motor drive for a rotating cam drum which actuates plural appliance program function switches. An advance pawl drives the cam drum in one direction when selectively engaged with a toothed wheel on the drum and drives through a first rotary frictional coupling. A gear train drives continuously through a second rotary frictional coupling and drives the cam drum in a reverse direction when the advance pawl is disengaged. When the pawl is engaged, the second rotary frictional coupling slips and is overdriven in a direction opposite its driving direction by said first frictional coupling.

Abstract: An electromechanical programmer having a user push-push reset action on the shaft of a rotary cam drum for actuating plural appliance function switches. Successive user push movements alternately latch and release the shaft between first and second axial positions. In the first axial position the shaft moves an auxiliary cam to close a line power switch for energizing a motorized cam drum advance and powering the program switches; and, the shaft is free-rotating with respect to the cam drum. In the second axial position the shaft moves an auxiliary cam to open the line power switch; and, the shaft is clutched to the drum to enable user rotation of the drum for appliance program interval selection.

Abstract: A programmer/timer for an appliance of the type having a rotatable cam drum advanced for sequential actuation and deactuation of a plurality of electrical switches. The drum is advanced or indexed intermittently by an oscillating advance pawl engaging a ratchet wheel and also continuously by a gear driven by a common motor for oscillating the advance pawl. The ratchet wheel has a hub which is frictionally engaged to drive the cam drum. The driven gear in turn is frictionally engaged with the hub to also drive the ratchet wheel. When the advance pawl engages the ratchet wheel for intermittent drive, the driven gear slips on the ratchet hub. Upon user selection, a separate cam track lifts the advance pawl to permit the driven gear to continuously drive the ratchet wheel.

Abstract: A clutch assembly permits a manual setting of a timing mechanism camstack by an appliance operator and at the same time insures that the camstack cannot be manually set during the time that electrical power is being supplied to the timing mechanism. The assembly includes a support and a camstack, a shaft and a bearing mounted in the support for rotation about a common axis. First clutch teeth are integrally formed within the bearing and second clutch teeth are integrally formed within the shaft. The bearing is mechanically coupled to the camstack via tangs on the camstack which pass through channels in the bearing. The shaft is axially movable from a first position in which the first and second teeth are engaged to a second position in which the teeth are disengaged.

Abstract: A combination programmer and line switch for an appliance having a rotary program cam and a timing motor connected for advancing the cam. An upper line power contact blade is moved between high and low positions by a manual actuator. A lower contact blade is maintained stationary and is adapted for connection to certain appliance load functions. An intermediate program contact blade series connected to the timing motor has a follower biased against the program cam and is adapted for connection to all appliance functions. With the upper contact in the high position, the motor circuit is open for all positions of the program and in the low position the timing motor is energized. Alternatively, the program cam may include a line contact switch override to maintain the intermedaite blade in contact with the upper blade for both positions of the manual actuator.

Abstract: A programmer/timer for an appliance of the type having a rotatable cam drum advanced for sequential actuation and deactuation of a plurality of electrical switches. The drum is advanced or indexed intermittently by an oscillating advance pawl engaging a ratchet wheel and also continuously by a gear driven by a common motor for oscillating the advance pawl. The ratchet wheel has a hub which is frictionally engaged to drive the cam drum. The driven gear in turn is frictionally engaged with the hub to also drive the ratchet wheel. When the advance pawl engages the ratchet wheel for intermittent drive, the driven gear slips on the ratchet hub. Upon user selection, a separate cam track lifts the advance pawl to permit the driven gear to continuously drive the ratchet wheel.

Abstract: An improved automatic shut-off appliance timer is disclosed which actuates an associated appliance at a set-time and deactuates it a fixed period of time later. The timer comprises a clockwork mechanism, including a cam wheel and a trip wheel which approach one another when the set-time is reached. The relative position of the two wheels is set to define the set-time. When the set-time is reached, a cam follower resting on one of the cam wheel and trip wheel is permitted to move axially, moving a switch shaft and allowing electrical contacts to abut, closing the circuit of the associated appliance. Thereafter, a sector gear also comprised by the switch shaft is engaged by the motor, positively rotating the switch shaft. A cam follower integrally carried by the switch shaft then moves along a drop-off cam formed integrally with the front plate of the timer.

Abstract: A timing mechanism comprising a camstack having a hollow hub rotatably mounted between support plates, electrical switches actuated by the camstack as it rotates, a bearing having a bore in it and rotatably journalled in one of the support plates, and a shaft mounted axially in the camstack with one end rotatably supported in the bearing and the other end in the other of the support plates. The shaft is axially movable between a first position and a second position, which positions are determined by a detent assembly comprising two grooves in the shaft and spring fingers located in the bore of the bearing. The fingers engage one groove when the shaft is in the first position and the other groove when the shaft is in the second position.

Abstract: An electrical switch for an appliance which includes a push-to-start control switch for starting a motor operation. The switch comprises a housing, a covering for the housing, a rotatable non-conductive cam positioned within the housing having a set of annular cam tracks thereon for controlling an appliance.

Abstract: A timer assembly automatically turns off an appliance to which it is connected within a predetermined time period after the appliance has been automatically, or manually, turned on. The timer assembly includes a three-position selector mechanism with rotating cams that activate a plunger to control the operation of an electrical switch which, in turn, activates or deactivates the appliance. Rotation of the selector mechanism is controlled by a clockwork assembly which rotates the selector into a position to turn on the appliance at a predetermined set-time. When the selector is rotated into its "on" position, a gear connected to the selector engages a drive gear which is, in turn, connected to the clockwork assembly. The drive gear continues the rotation of the selector so that after a predetermined time interval, the appliance is turned off.

Abstract: This programmer comprises programme-cams corresponding to a plurality of programmes having clearly separate starting points disposed at angular intervals from one another. It further comprises a control element adapted to be rotated manually for selecting the initial position of one of the programmes. This element comprises lateral pins adapted to engage corresponding orifices formed in a coaxial registering control cam. On the opposite side of this cam a disc rigid with the programme-cams is provided; this disc is rigid with the programme-cams but spaced therefrom. The disc comprises ramp means cooperating with bearing faces formed in the control cam. Spring means interconnect the disc and the control cam in diagonal directions.

Abstract: A push button member (10) is mounted to be moved longitudinally between a first position (FIG. 1A) and a second position (FIG. 1B). The push button member includes a cam surface (16) for selectively camming an electrical contact engaging surface (18) and a hold surface (48) past a follower member (32) as the push button member is moved from the first position to the second position. In the second position, the electrical contact engaging surface urges electrical leaf spring contacts (20) into a closed conducting relationship. The spring contacts remain in the conducting relationship until a radially greater extending cam surface (52) of a timing cam (50) engages the follower member moving it to the release position. In the release position, a spring (12) biases the push button member from the second position back to the first position allowing the electrical contacts to open.

Abstract: A programmer comprising a cam unit which can be rotated manually in a first direction by a control shaft 23 able to occupy, under the action of a pawl device comprising a spring, any one of several equidistant stable angular stop positions spaced apart by the angular value of one step, before passing on each occasion through a limiting unstable intermediate angular position, after which this shaft is brought in a resilient manner by the pawl device towards the following stable angular stop position. A motor and drive transmission system are able, when controlled, to rotate the cam unit step by step in said first direction. The cam unit is connected to rotate with the control shaft, with an angular clearance less than the angle through which the shaft travels, between any one of its stable angular stop positions and the limiting unstable intermediate angular position which follows.

Abstract: A program timer wherein a single three blade switch assembly is utilized for both the line switching function and a cam track operated switch.

Abstract: A variable power control device for varying the operating duty cycle to an electrical load such as an electrical heating unit, for example, an electrical cooking range, heating pad and the like. The control device can be used to adjust the on time of the electrical load or the temperature of the electrical load. The control device includes a cycling cam which rotates at a constant velocity, and a rotatable movable adjustment cam. A cycling electrical contact switch is located with one contact thereof disposed to follow the contour of the cycling cam and the other contact thereof disposed to follow the contour of the adjustment cam. An on-off of electrical contact switch is associated with an on-off cam with one contact disposed to follow the contour of the on-off cam and the other contact being stationary.

Abstract: A switch arm connector block for mounting a plurality of spring switchblades in a predetermined array for sequential cooperation with a timer cam and for providing a quick-disconnect connector for electrically connecting the blades to a wiring harness is disclosed. The connector block is formed by a plurality of insulating wafers which encapsulate a plurality of flat, parallel switchblades. The faces of the wafers are spaced from each other by projecting curbs around the perimeters of the wafers and window openings are provided in the wafers so that internal bussing may be provided in the block. End bussing is provided and the end bussing strips are covered by a protective cap having insulating fences for protecting the bussing strips.

Abstract: A timing mechanism has a rotating camstack which opens and closes electrical contacts that are carried by electrical contact blades which are actuated by the camstack. One of the two cooperating electrical contact blades is also actuated by a first sliding member that is manually operated by an actuator to open and close a circuit to a main power supply. Manual rotation of the camstack to set a program is prevented when the circuit to the main power supply is closed by a second sliding member that is simultaneously operated off the same actuator. A step in a cam associated with the electrical contact blade to the main power supply opens the circuit to the main power supply when there is a malfunction.

Abstract: A method of operating a timer device having means for indicating the remaining operating time during an operating time period selected for the timer device. The timer device includes a gear train having a pair of branches coupled with the indicating means to drive it in different preselected speed modes through the selected operating time period. In this method, the indicating means is driven in one of the preselected speed modes through one of the gear train branches during an operating time period in excess of a predetermined operating time period of the timer device with the sum of the excess and predetermined operating time periods comprising the selected operating time period, and the drive of the indicating means through the other of the gear train branches is obviated during the excess operating time period.

Abstract: An improvement is presented for a timing mechanism wherein the closing of a particular circuit results in a high electrical current surge. The rapidity of the circuit closure (made necessary by the current surge) results in contact bounce. A fast drop of a cam follower is provided by a cam having a substantially flat outer periphery and a face which has a steep drop with a gentle curvature. Upon dropping the cam follower, electrical contact arms are engaged which include a coil spring damper to dissipate kinetic energy encountered during contact closure, thereby preventing the contacts from bouncing.

Abstract: An electric switch is either automatically actuated by a motor driven timer or manually actuated, as determined by turning a three-position selector. The timed switch may be used with a conventional motor-driven clock and uses a commercially available microswitch which can provide either timed-"ON" or timed-"OFF" operation. Rotation of the selector in either direction causes longitudinal displacement of a spring-loaded actuator, which operates the switch. The selector has latching arms which are latched either in a manual position or in the automatic timed position.

Abstract: When the axially movable shaft mounted in the hub of a program cam drum is moved inwardly a pin loosely mounted in a cross hole on the shaft will move into engagement with teeth on a drive sleeve mounted between the shaft and the drum hub while a washer fixed on the end of the shaft moves to actuate a slider which then actuates and opens a line switch to take power off the appliance controlled by the timer. Engagement of the pin with the sleeve completes the drive to the sleeve and the sleeve is keyed to the drum by lugs projecting to slots in the hub. Now the shaft can rotate the timer drum without power applied to the appliance. When the shaft is pulled out, the line switch closes and the drive pin is disengaged from the teeth and rotation of the shaft is not effective to rotate the timer.

Abstract: A timer switch comprises a drive gear secured to an interval shaft rotatably mounted on a casing. A first clutch gear is rotatably mounted on a bushing which is rotatably mounted on said casing. The first clutch gear is in mesh with the drive gear. A second clutch gear is fixedly mounted on the bushing for rotation therewith and disposed in closely spaced opposed relation to the first clutch gear. The second clutch gear is operatively connected to an electric motor. A slip friction clutch in the form of a flat resilient plate is interposed between and frictionally engages the opposed first and second clutch gears so that the slip friction clutch is deformed into an arcuate cross-section. The slip friction clutch urges the first clutch gear away from the second clutch gear into frictional engagement with the bushing.

Abstract: An electromechanical timer arrangement includes a rotatable cam having a cam surface for actuating an associated switch. An inhibit member is movable between an active position and an idle position. In its active position, the member engages the switch and prevents cam actuation of the switch. In its idle position, the member permits normal cam actuation of the switch. In controlling a dishwasher the active and idle positions are user-selected non-heated and heated drying cycles and the switch controls energization of the heater. The cam surface is contoured to close the switch for heated drying. Moving the member to its active position opens the switch, regardless of the cam position, for non-heated drying.

Abstract: A cam is axially displaced so that a pair of cam followers sequentially drop from the cam's outer periphery to sequentially close a pair of electrical switches which are responsive to the cam followers. Upon completion of a program, the cam is permitted to displace to its original position. A clip ring clutch is used to provide a two-way manual rotation of a ring which carries a ramp that axially indexes the cam.

Abstract: In the illustrative embodiment of the invention, an electromechanical timer employs a manually operable actuator, a pawl and a control cam cooperatively arranged to provide a push to start capability. The control cam is carried on a shaft having a longitudinal bore formed therein. The actuator is slidably received in the bore for axial movement between a neutral position and an actuating position. One end of the actuator extends from the shaft for manual operation. The other end has an axial cam surface formed thereon. The pawl is mounted for pivotal movement between a rest position and a cocked position and spring biased to its rest position. A cam follower extends from the pawl into the path of the axial cam surface of the actuator for camming engagement between pawl and actuator. A ratchet tooth is formed on the control cam for engagement by the pawl.

Abstract: A free-floating shorting bar carries electrical contacts at opposed ends thereof. The shorting bar is actuated to open and close mating electrical contacts by a pair of axially indexable shafts in a manner whereby three electrical contact conditions are provided: (1) With both shafts indexed "out" a first set of contacts is closed and a second set is opened; (2) With both shafts indexed "in" the first set is open and the second set closed; and (3) When one shaft is indexed "out" and one "in", both sets of contacts are closed.

Abstract: There is disclosed a timing mechanism utilizing a digital interval timer composed of rotating drum wheels each having a cam to close electrical switches to provide a program sequence. Cam followers are constructed and arranged so that when they drop in notches of the cams the drum wheels can be rotated in either direction.An auxiliary program is provided by a slideable drum shaped helical cam that actuates a cam follower. The drum shaped helical cam is manually axially set to provide a desired program. Both the drum shaped helical cam and the drum wheels are power driven from the same source.The timing mechanism is packaged in a cup shaped housing having individual ribs in its side-walls to receive a frame carrying the drum wheels and the drum shaped helical cam.

Abstract: A slider is actuated by an outer shaft of two cooperating inner and outer shafts to move the slider and close electrical contacts. The outer shaft is spring-biased with respect to the inner shaft such that after a momentary closing the outer shaft is returned to its original position to open the electrical contacts. A means is provided to impart a snap action of the outer shaft with respect to the inner shaft.

Abstract: A timer device has a pair of switches, a pair of cam means adapted for rotation so as to respectively actuate the switches in a first preselected sequence, and means for driving the cam means to effect the respective rotation thereof. Means for driven association with the driving means so as to be rotatable with the cam means includes means rotatably adjustable from one operating position of at least a pair of operating positions toward another thereof for interrupting the actuation of one of the switches by the one cam means in the first preselected sequence with the actuation of the other of the switches by the other of the cam means and for permitting the actuation of the one switch by the one cam means in another preselected sequence with the actuation of the other switch by the other cam means.An assembly for use in a timer device and a method of operating a timer device are also disclosed.

Abstract: A means for preventing the bypassing of the timer protective mechanisms in an automatic washing machine is provided by a shield freely rotatable on the timer shaft fully covering the indicator dial across its face and over its edges and being transparent so as to allow the indicator to be seen, while preventing manual access to the control components associated with the timer shaft.

Abstract: An electrical switch construction having a stationary frame carrying an electrical switch provided with different operating conditions and an actuator pivotally mounted directly in the frame and operatively associated with the switch for operating the switch to the different conditions thereof in accordance with the pivot position of the actuator about its pivot point in the frame. A timer member is operatively associated with the actuator for repetitively pivoting the actuator about its pivot point to cause the switch to be repetitively in one condition thereof a certain percentage of a certain increment of time and for being in another condition thereof for the remainder of the certain increment of time. An adjustable member is operatively associated with the actuator for changing the pivot point thereof in the frame and in relation to the switch and thereby selecting the amount of the certain percentage of the certain increment of time within certain limits.

Abstract: A cam is axially displaced so that a pair of cam followers sequentially drop from the cam's outer periphery to sequentially close a pair of electrical switches which are responsive to the cam followers. Upon completion of a program, the cam is permitted to displace to its original position. A coil spring clutch permits an actuator to be located in a predetermined position for axial displacement of the cam.

Abstract: A stop start fixed cycle sequence timer is started at variable intervals by an adjustable automatic reset timer. This reset timer includes a clutch and resets when the clutch is disengaged. The cycling timer includes a clutch cam and cam follower which disengages and reengages the clutch while the cycling timer is going through its cycle.

Abstract: A control mechanism for a sequential timer is disclosed. The mechanism includes an axially movable timer shaft which is associated with a timer shaft extension or control knob in such a way that initial movement of the control knob to select a particular position on the timing cycle will axially move the timer shaft to open a circuit in the timer. The open circuit prevents arcing of switch contacts and short pulsing of current through solenoids and motors.

Abstract: A cup shaped hub has an actuator rim at its open end and is rotatably carried on a shaft through an aperture in its closed end. The hub is axially fixed to the shaft such that when the shaft is axially displaced the actuator rim opens and closes a line switch. A ratchet is carried by the shaft and is axially spring biased by a coil spring disposed between the cup shaped hub and the ratchet. A pin carried by the shaft engages the ratchet such that the ratchet may be rotated and axially displaced with the shaft. A coupling means couples the shaft to a cam means rotatably carried by the shaft and the cup shaped hub and includes teeth engaging the ratchet means such that a manual rotation of the shaft provides manual rotation of the cam means.