US3075055A - Timer - Google Patents

Description

Jan. 22, 1963 M. A. HALL 3,

TIMER "Filed June 11, 1959 6 Sheets-Sheet 1 v INVENTOR.

MITCHELL A. HALL ATTORNEY M. A. HALL Jan. 22, 1963' TIMER Filed June 11, 1959 INVENTOR MITCHELL :4. HALL ATTORNEY Jan. 22,- 1963 M. A. HALL 3,075,055

' TIMER Filed June 11, 1959 6 Sheets-Sheet 3 INVENTOR. MITCHELL '4. HA LL ATTORNEY M. A. HALL 3,075,055

TIMER 6 Sheets-Sheet 4 INVENTOR.

MITCHELL, A. HALL 2 I "m /l//// r Jan. 22, 1963 Filed June 11, 1959 BY A ATToR Jan. 22, 1963 Filed June 11, 1959 M. A. HALL TIMER 6 Sheets-Sheet 5 INVENTOR.

MITCHELL A. HALL ATTORNEY M. A. HALL Jan. 22, 1.963

TIMER Filed June 11, 1959 5 Sheets-Sheet 6 MITCHELL A. HALL ATTORN Y This invention relates to a timer mechanism, and particularly to a mechanism adapted to close an electric circuit to an appliance or other device to be operated for a predetermined length of time.

An object of the invention is to provide a simple, highly efficient, substantially foolproof time control mechanism which may be associated with any type of conventional means for providing a setting which will initiate the beginning of a predetermined time cycle.

A further object of the invention is to provide a timecontrol mechanism having the hereinabove described characteristics which is adapted to be associated with the standard housings or control boxes of coin-actuated equipment, such as, by way of example, electric driers, Washers and the like, whereby the timer mechanism, though entirely independent of, may nevertheless be initiated and controlled by, the conventional coin-actuated slide type mechanisms usually associated with such housings.

Another object of the invention is to provide a time control mechanism having adjustable means associated therewith for enabling the timer to provide a wide variety of different timing cycles, depending upon the uses to which the timer is to be put, thereby greatly enhancing the flexibility and commercial acceptance of the device.

A further object of the invention is to provide a coinslide-actuated timer which is so constructed and arranged as to preclude malfunction which would result in more time being delivered by the device than was actually paid for. In other Words, the device is substantially cheatproof.

Still a further object of the invention is to provide a time control mechanism which is characterized by its extreme accuracy and which is adapted to be mounted in a typical housing in such a manner that it cannot be tampered with or cheated on in any way. In the preferred embodiment of the invention the subject time control mechanism is secured to and carried by a lockactuated access door, thereby rendering the device read ily accessible to authorized persons for permitting easy removal of the entire mechanism for inspection and/ or adjustment of the basic time setting.

These and other objects are attained by the means described herein, and as disclosed in the accompanying drawings, in which:

FIG. 1 is a side elevation of a typical housing or box containing coin injection mechanism, coin accumulating compartment and the time control mechanism of the present invention.

FIG. 2 is a rear end view of the box of FIG. 1.

PEG. 3 is a top plan view of the box of FIG. 1.

FIG. 4 is an enlarged fragmentary view of the box as shown in FIG. 1, partially broken away to illustrate the time control mechanism housed therein.

FIG. 5 is a top sectional view taken on line 5--5 of FIG. 4.

FIG. 6 is a vertical sectional view taken on line 66 of FIG. 5.

FIG. 7 is a view similar to FIG. 6, illustrating the mechanism in its actuating position.

FIG. 8 is a vertical cross-sectional view taken on line 8-8 of FIG. 5, illustrating the time control mechanism in its Off position.

FIG. 9 is a fragmentary section similar to FIG. 8, illustrating the mechanism in its ()n position.

FIG. 10 is a side elevation of certain parts of the mechanism as seen in PEG. 4, illustrating the relative movement of said ports.

FIG. 11 is a sectional view similar to FIG. 6, illustrating one position of a modified form of the invention.

HS. 12 is a sectional View similar to FIG. 11, illustrating the second position of the modified form of the invention.

The box, as illustrated in FIGS. 1, 2 and 3, is generally rectangular in configuration, comprises side walls 29 and 21, top and bottom walls 22 and 23, and front and rear end walls 2 and 25. 'Front end wall 24 carries a conventional coin injecting slide mechanism, indicated generally at 26. When a coin of proper denomination is inserted in the circular aperture 27, the slide may be fully actuated and the coin injected into the box where it is deposited in a coin accumulating compartment, accessible through door 28 in side wall 20. Door 28 is provided with a lock 30. The coin controlled slide mechanism may be of any appropriate conventional construction and is not disclosed or described in detail as it forms no part of the present invention beyond the provision of a leading edge or abutment 31 (FIGS. 6 and 7) on the coin injecting slide as.

Each time a proper coin is inserted in aperture 27 and injected into the box, the leading edge or abutment 31, being either integral with or rigidly attached to slide 26, moves into contact with and rocks a lever 32 from the position illustrated in FIG. 6 to the position illustrated in FIG. 7.

A tension spring 33 is attached at one end to an ear 1% integral with lever 32, and at its other end to an upstanding arm 35 forming part of a stop member 36. Stop member 36 is rigidly fixed to a base plate 37 by means of a detent 313 and rivet 4d and provides a stop or limit for lever 32:. The edge 41 of lever 32 is yieldably urged against stop member 36 by tension spring 33 (PEG. 6).

Ease plate 37 is fixed, as by spot welds, to a door plate 42, removably mounted in the end wall 25, and provided with a lock unit indicated generally at Lever 32 is rotatably journaled on a collar 44 (FIG. 8) formed integral with base plate 37, and positioned to place lever 32 in the line of travel of the leading edge or abutment 33% of coin injecting slide 26.

Lever 32 is held in place on collar 44 and against base plate 37 by means of a ring bracket 138 encircling collar 44- and being provided with an offset foot portion 39, rigidly attached to base plate 37 by means of an appropriate scrcw 13$.

A pawl 45 (FIG. 6) is pivotally attached to lever 32, as at 46, and is adapted to engage the teeth of ratchet Wheel 48. A tension spring 54) extends between an car 51 of pawl arm ift and an car 52 extending radially outwardly from the journal ring 53 of lever 32. Spring 50 holds pawl 4-5 in engagement with ratchet Wheel 48.

As illustrated in FIG. 7, when the lever 32 is rocked in a counter-clockwise direction, pawl 45 will be moved out of engagement with tooth 54- of ratchet wheel 48 and shifted downwardly against lug 56 preparatory to engagement with the succeeding tooth 55. Overtravel of pawl scrapes 4-5 is thus limited by means of the upstanding lug 5d, struck from base plate 37. Tension spring 33 will return lever 32 to its initial, upstanding or starting position (FiG. 6), whereupon pawl will engage ratchet tooth 55 during the return stroke and thereby advance the ratchet wheel in a clockwise direction by one tooth.

As best illustrated in FIGS. 8 and 9, ratchet wheel 48 is provided with a central aperture 57 adapted to he slid over the counter-turned neck 53 of a hub 6d and is keyed thereto by means or" a lug 61 struck from the ratchet wheel and extending into a keyway 62, provided in hub at The hub and ratchet wheel assembly is rotatably iournaled in the bore 63 provided in the collar 4d and is held in place by means of an enlarged beveled head portion providing a shoulder (id overlying the base plate 37 at one end of collar dd. Ratchet wheel 43 is held against the other end of collar 44 by means of a spring washer as and a split ring as seated in an annular groove 67 in the counterturned neck portion 53 of hub 6d. Sufiicient friction is thus provided by the spring washer to prevent the hub and ratchet wheel assembly from rotating with the pawl as it travels in a counter-clockwise direction over the ratchet teeth. The return travel, under the influence of spring 33, readily overcomes the friction to rotate the ratchet wheel and hub assembly in a clockwise direction as illustrated in FIGS. 6 and 7.

As best illustrated in FIGS. 8 and 9, the hub do is provided with a central screw threaded bore es to receive an externally threaded stud 7t; provided with a head portion 71 at its outer end which carries a second ratchet wheel 72. Ratchet wheel 72 is rigidly fixed to the head 71 of threaded stud 70 by means of a collar portion 73 swaged over the beveled periphery of the central aperture 74 of ratchet wheel 72. Rotary movement of ratchet wheel '72 is restricted by a pair of spring metal pressure pads 75 and 76 exerting an axially opposed pressure on opposite faces of the ratchet wheel as best illustrated in PEG. 5. The leg '77 of one pressure pad 75 is rigidly attached as by screw 7% to an ear turned outwardly from base plate 37. The other pressure pad 76 is fixed to the leg 77 of pressure pad '75 by means of a tab (iii extending through a slot 81 in leg '77 and a rivet 82, FIGS. 4 and 5.

The externally screw threaded stud it? is also provided with a central bore 83. The forward or inner end 84 of bore 83 is somewhat smaller in diameter and is threaded to carry a set screw 85 which is adapted to contact a switch actuating plate 36.

As best illustrated in FIG. 5, plate 86 is pivoted, as at 67, at one end in a bracket 83 secured to base plate 37 by means of a screw 9th The other end 91 of plate 86 is adapted to contact button 92 of a micro-switch 93 under pressure of set screw 85, as will be described later in the specification. Micro-switch 93 is firmly supported between brackets $8 and 9d.

Ratchet wheel 72 is driven in a clockwise direction by means of a control member indicated generally at 95, which is the subject matter or" a co-pending application, Serial No. 819,355, filed June 10, 1959, and will be described only insofar as is necessary to understand the operation of the present invention.

The control member 95 is driven in a counter-clockwise direction by means of a clock motor 96, and is composed of a body portion 97 and a plurality of radially disposed adjustable stops or abutment plates 98 (FIGS. 2 and Each abutment plate 95 terminates in an outturned lip Mill, and is axially adjustable to either a fully retracted or a fully advanced position. In their fully advanced position, lip lilo will contact the teeth lull or ratchet wheel 72 and impart a relative movement to the wheel. I When the abutment plates are fully retracted, they by-pass or clear thefteeth oi ratchet wheel '72. Therefore, if motor 96 is driving the control member @5 in a counter-clockwise direction at a rate of one revolution per hour, for example, and if all twelve abutment plates are fully advanced as in FIG. 10, an abutment plate 93 will cont-act a tooth N1 of d ratchet wheel '72 every five minutes. The abutment plates 3 and ratchet teeth ltll are spaced, as illustrated in FIG. 10, so that each abutment stop or element 1% will drive the ratchet wheel 72 in a clockwise direction by an amount indicated by the distance between radial lines A and B.

In PEG. 4, every third stop or abutment plate has been fully advanced and the remainder are fully retracted. A fifteen minute interval will therefore elapse between the contacting of each ratchet tooth. Various other time intervals of either regular orirregular duration may be provided for, simply by advancing or retracting various abutmeat plates in operation, a coin of the required denomination is inserted in the aperture 27 of the injecting slide 26 and advanced in the conventional manner until the coin is deposited in the coin accumulating compartment. The leading edge of the injecting slide provides abutment 31 which rocks arm 32 in a counterclockwise direction. Pawl 45, pivotally carried by arm 32, rides out of engagement with tooth dd of ratchet wheel 48 and into position to engage the succeeding tooth as. When coin injectin slide is released, tension spring 33 returns lever 32. and pawl 45 to its starting position. The pawl, meanwhile, has engaged tooth 555 and rotated the periphery of ratchet wheel 48 a distance of equivalent to the length of one tooth. if the coin injecting slide is r leased suddenly, there may be an inclination for the pawl and ratchet wheel to bounce and possibly ship a tooth, due

to the sudden stop against stop member 3%. A tapered lock plate lldZ is provided to eliminate this possibility. The tapered edge 1% lies in the plane of travel of pawl as, and is positioned to be very closely adjacent to or to abut the top edge lti l of the pawl as edge if. of lever 32 contacts stop 36. Pawl 45' is therefore held or locked in engagement with ratchet wheel 43. The tapered lock plate is fixed by a screw 1% to base plate 37.

The clockwise movement of ratchet wheel 48 is directly transmitted to hub do by means of lug er in keyway Bus to the friction created on sprocket Wheel '72, by the pressure pads and 76, ratchet wheel 72 will not rotate with ratchet wheel instead, the internally threaded bore of hub as threads or moves the stud 7d axially outwardly, carrying ratchet wheel 72 away from ratchet wheel 43. Set screw is therefore withdrawn from contact with switch plate 86, permitting microswitch 93 to assume its normally On position.

Motor 96 is energized by switch )3 causing control member to rotate in a counterclockwise direction. As previously described, each stop or abutment plate 98 mo-ves the periphery of ratchet wheel 72 a distance exactly equal to the length of one tooth. The friction created by spring washer 65 on ratchet wheel 48 prevents switch button 9'2 to disengage the contacts of microswitch E3.

in practice, the micro-switch, in addition to operating motor 96, may also be in electrical connection with a piece of machinery, appliance, or any kind of equipment that is to be operated for a pro-determined period of time for a set fee. For example, in operating a clothes dryer with a set fee of live cents for live minutes, all twelve abutment plates would be advanced on the control member 5 5. if it were desired to operate the dryer for thirtyfive minutes, seven nickles would be consecutively injected into the box by means of the slide as. Each time the lever 32 would be rocked as previously described by the slide abutment Iii, the periphery of ratchet wheel 48 will be rotated a total distance equivalent to the length of seven teeth. When the first coin is injected, the dryer as Well as the motor 96 will be energized. Control member 95 will rotate until seven abutment plates have contacted seven teeth on ratchet wheel 72, to rotate the periphery of the wheel a distance equivalent to the length of seven teeth. Thus, the outward axial movement imparted to ratchet wheel 72 by the rotation of the periphcry of ratchet wheel 48 a distance equivalent to the length or seven teeth is compensated for by the inward axial movement imparted by the same amount of rotation of ratchet wheel '72. The dryer and motor 96 will then be de-energized by switch 3 in the manner previously described.

When the abutment plates are arranged to impart rotary movement to ratchet wheel 72 at fifteen minute in tervals, as illustrated in FIG. 4, four appropriate coins would be required for one hour of operation. Four coins would move ratchet wheel 48 a distance equivalent to the length of four teeth. As every third abutment plate 98 would contact ratchet wheel '72, one complete revolution of control member 95 would be required to move ratchet wheel 72 a distance equivalent to the length of four teeth to shut ed the motor Q6 and dryer inthe manher just described.

It may be desirable to provide a time control mmhanism in which the amount of rotation of ratchet wheel 48 can be readily changed from a peripheral rotation equivalent to the length of one tooth to a peripheral rotation equivalent to the length 5 two teeth, for each coin injected. The modification illustrated in FlGS. 11 and 12 provides an adjustable lock plate 11% and an adjustable stop member 111. Lock plate lid is provided with two holes 112 and 113, While the base plate 3. is prm vided with three holes 114, 115 and lid.

in FIG. 11, screw 117 is threaded through hole 113 of lock plate lid into base plate 37 to confine the lock plate in the position shown while screw lid is threaded through hole 115 in base plate 37 into stop member 111.

'Detent K19 lies in hole lid and cooperates with screw lit; to rigidly confine the stop member Elli in the position illustrated. When the actuating lever 32 is rocked in the manner previously described, pawl 45 disengages lock plate 11% and is moved in a counter-clockwise direction over ratchet tooth 12% to a position in engage- 'ment with lug 56 similar to the position illustrated in FIG. 7. The return stroke of lever 32 will carry pawl as into contact with tooth 12d and move tooth 12th to the position occupied by tooth ml in FIG. 11 before the pawl is locked in place by the plate lit), and lever 32 contacts stop member 111. The ratchet wheel 43 is therefore rotated in a clockwise direction a distance equal to the length of one tooth.

In FIG. 12, the lock plate 116 is moved upwardly from the position illustrated in FIG. 11, by threading screw 117 through hole 112 into the base plate 37. Stop member 111 is moved to the position illustrated in FIG. 12, by threading screw 113 through hole 116 into stop member 111 with detent 119 lying in hole 115. Counterclockwise rotation of lever 32 carries pawl 45 out of engagement with lock plate 110 and ratchet tooth 122. Pawl 45 passes over teeth 12.3 and 124 to its position on lug 5d. The return stroke of lever 32 will carry pawl 45 into contact with tooth 124 and move it to the position occupied by tooth 122. The ratchet wheel 48 is therefore rotated in a clockwise direction a distance equal to the length of two teeth.

By providing the adjustments to regulate the amount of rotation of ratchet wheel 48 by the injection of each coin, as just described, the time control mechanism is even more flexible in providing any desired time cycle. Various settings of abutment plates 98 in connection with the two settings of ratchet wheel 4-8 provide this great flexibility.

What is claimed is:

1. A timer comprising an axially shiftable externally threaded stud member, first rotatable means for imparting non-rotational endwise axial movement to said memher in one direction, and second rotatable means for imparting rotational and endwise axial movement to said member in the opposite direction, and means on said stud member to actuate an electric contactor.

2. A timer including an electric switch having an actuator element shiitable between circuit closing and circuit breaking positions, a member axially shiftable toward and away from said actuator element, first rotatable means for imparting endwise movement to said member away from said actuator element for shifting said element to a circuit closing position, and second rotatable means fixed to said axially shiftable member coaxially with said first rotatable means for imparting endwise axial movement to said member toward said actuator element, to engage and shift said element to a circuit breaking position.

3. A timer including circuit control means, an axially shiftable member, first means having unidirectional rotation only, for imparting endwise linear movement to said member in one direction only for actuating said circuit control means to a circuit closing condition, second means operable in the same direction of rotation as the first means for imparting a reverse linear endwise movement to said member, and motor means operable incident to completion of a circuit through said circuit control means for driving said second means to impart the aforesaid reverse linear endwise movement to said member for actuating for imparting a step-by-step rotary motion to said first means in said one direction, second rotatable means rotative in the same direction of rotation as said first means,

for imparting endwise movement to said member in an opposite linear direction, automatically operable means for imparting rotary motion to said second rotatable means, and means actuated by said member for controlling the operating periods of said automatically operable means.

5. In a device of the class described, the combination of a support member having a bore therein, an internally threaded bushing rotatably mounted in said bore and fixed against endwise axial movement therewith, an externally threaded shaft engaging said internally threaded bushing, a member secured to, carried by and projecting axially from an end of said shaft, means for rotating said bushing, means for precluding rotation of said shaft incident to rotation of said bushing, whereby rotation of said bushing will impart endwise axial movement to said shaft relative to said bushing, and means for rotating said shaft relative to said bushing for imparting a counter axial movement to said shaft.

6. A timer including circuit control means, an axially shiftable member for actuating said circuit control means to circuit closing or circuit breaking conditions, first rotatable means for imparting endwise movement to said control member in one direction, and second rotatable means for imparting endwise movement to said control member in an opposite direction.

7. A timer including circuit control means, a member for actuating said circuit control means to a circuit closing or circuit breaking condition, first means mounted for rotation about but fixed against endwise movement along an axis, second means rotatable about and shiftable endwise along said axis, said member being secured to, carried by and projecting from said last mentioned means, means operatively interconnecting said first and second means whereby rotation of said first means will impart axial movement only to said second means, and wherein rotation of said second means will impart axial movement 7 thereof relative to and without rotating said first means.

closing and circuit breaking conditions, a support memer having a bore therein, an internally threaded bushing rotatably mounted in said bore and fixed against endwise axial movement therewith, an externally threaded shaft engaging said internally threaded bushing, said member secured to, carried by and projecting axially from an end of said shaft, means for rotating said bushing, means for precluding rotation of said shaft incident to rotation of said bushing, whereby rotation of said bushing will impart endwise axial movement to said shaft relative to said bushing, means for rotating said shaft relative to said bushing for imparting axial movement to said shaft in an opposite direction, an electric motor, means driven by said motor in driving relationship with said shaft, said circuit control means adapted to close an electrical circult to said motor incident to axial movement of said member in one direction for imparting rotation to said shaft to move said member in the opposite direction to a circuit breaking position.

9. A timer including circuit control means having an element movable between one or the other of two normal positions to establish a circuit closing or a circuit breaking condition within said means, a member for actuating said element, first means mounted for rotation about but fixed against cndwise movement along an axis, second means secured to and carried by said first means, said second means rotatable about and shiitable endwise along said axis and relative to said first means, said member being secured to, carried by and projecting from said last mentioned means, means operatively interconnecting said first and second means whereby rotation of said first menas will impart axial movement only to said second means for moving said member away from said circuit control element, and wherein rotation of said second means in the same direction will impart axial movement thereof relative to and without rotating said first means for moving said member toward said circuit control element.

10. A timer including circuit control means having an element movable between one or the other of twonormal positions to establish a circuit closing or a circuit breaking condition within said means, an axially shiftable member for actuating said element, an internally threaded bushing, means mounting said b ushing for rotation about but fixed against endwise movement relative to an axis, an externally threaded shaft engaging said internally threaded bushing, said member secured to, carried by and projecting axially from an end of said shaft for movement toward and away from said circuit control element, means for rotating said bushing in one direction, means for precluding rotation of said shaft incident to rotation of said bushing whereby rotation of said bushing will impart endwise axial movement to said shaft relative to said bushing, other means for rotating said shaft in the same direction relative to said bushing, means for precluding rotation of said bushing incident to rotation of said shaft whereby rotation of said shaft will impart axial movement thereto in an opposite direction, an electric motor, means driven by said motor in driving relationship with said shaft, said circuit control means .adanted to close an electrical circuit to said motor incident to axial movement of said member away from said circuit control element for imparting rotation to said shaft to move said member toward and to engagement with said circuit control member to break the electrical circuit to said motor.

ii. A timer including circuit control means having an element movable between one or the other of two normal positions to establish a circuit closing or a circuit breaking condition within said means, a member for actuating said element, first means including a ratchet wheel mounted for rotation about but fixed against endwise movement along an axis, second means including a ratchet wheel secured to and carried by said first means, said second means rotatable about and shiftable endwise along said axis and relative to said first means, said member being secured to, carried by and projecting from said last mentioned means, means operatively interconnecting said first and second means whereby rotation of said first means will impart axial movement only to said second means for moving said member away from said circuit control element, and wherein rotation of said second means in the same direction will imnert axial movement thereof relative to and without rotating said first means for moving said member toward said circuit control element, ratchet means operable for imparting a stcp-by-step rotary motion to the ratchet wheel associated with said first means, drive means engageable with the teeth of the ratchet wheel associated with said second means for imparting rotary motion thereto, an electric motor in driving relationship with said drive means, and means connecting said motor to said circuit control means whereby said motor will be driven during those periods of time when said circuit control element is in a circuit closing condition.

12. A timer including circuit control means having an element movable between one or the other of two normal positions to establish a circuit closing or a circuit breaking condition within said means, an axially shiftable member for actuating said element, an internally threaded bushing, means mounting said bushing for rotation about but fixed against endwise movement relative to an axis, a first ratchet wheel secured to and carried by said bushing, an externally threaded shaft engaging said internally threaded bore, a second ratchet wheel secured to and carried by one end of said shaft, said member secured to, carried by and projecting axially from the other end of said shaft, ratchet means for rotating said bushing in one direction for imparting axial movement to said shaft to move s id member away from said circuit control element, means for precluding rotation of said shaft incident to rotation of said bushing whereby rotation of said bushing will. impart endwise axial movement to said shaft relative to said bushing, drive means engageable with the teeth of said second ratchet wheel for rotating said shaft in the same direction relative to said bushing, means for precluding rotation of said bushing incident to rotation of said shaft whereby rotation of said shaft will impart axial movement thereto in an opposite direction, an electric motor, said drive means in driven relationship with said motor, said circuit control means adapted to automatically close an electrical circuit to said motor incident to axial movement of said member away from said circuit control element for imparting rotation to said shaft to move said member toward and to engagement with said circuit control member to break the electrical circuit to said motor.

13. An axially shiftable member, including in combination, first rotatable means for imparting endwise axial movement to a second rotatable means to which said member is secured, manually operable means for imparting a step-by-step rotary motion to said first means for'iinparting endwise movement of said second means in a direction away from said first means, and means for imparting rotary motion to said second rotatable means relative to said first means for returning said second means back to its initial position.

14. An axially shiftable member, including in combination, first rotatable means including a ratchet wheel mounted for rotation about but fixed against endwise movement along an axis, second rotatable means secured to and carried by said first means, means interconnecting said first and second means whereby relative rotation thercbetween imparts endwise movement of said second means relative to said first means, said member secured to and carried by said second means, manually operable means for imparting a stepby-step rotary motion to the ratchet wheel of said first means, and means precluding overriding rotation of said ratchet wheel beyond the step-by-step rotation thereof by said manually operable References Cited in the file of this patent UNITED STATES PATENTS Stein July 4, 1939 10 Hughes Jan. 11, 1949 Illian Oct. 4, 1949 De Moss Nov. 22, 1949 Weibull Apr. 15, 1952 McCullough Apr. 5, 1955 Laviana I an. 22, 1957 Greve Aug. 25, 1959 Greenwald Dec. 1, 1959 Constantine May 31, 1960

Claims (1)

1. A TIMER COMPRISING AN AXIALLY SHIFTABLE EXTERNALLY THREADED STUD MEMBER, FIRST ROTATABLE MEANS FOR IMPARTING NON-ROTATIONAL ENDWISE AXIAL MOVEMENT TO SAID MEMBER IN ONE DIRECTION, AND SECOND ROTATABLE MEANS FOR IMPARTING ROTATIONAL AND ENDWISE AXIAL MOVEMENT TO SAID MEMBER IN THE OPPOSITE DIRECTION, AND MEANS ON SAID STUD MEMBER TO ACTUATE AN ELECTRIC CONTACTOR.

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