US3117191A

US3117191A - Push button timer or counter

Info

Publication number: US3117191A
Application number: US88877A
Authority: US
Inventors: Page Phyllis Dillman
Original assignee: Automatic Timing and Controls Inc
Current assignee: Automatic Timing and Controls Inc
Priority date: 1961-02-13
Filing date: 1961-02-13
Publication date: 1964-01-07
Anticipated expiration: 1981-01-07
Also published as: GB987762A

Description

P. D. PAGE PUSH BUTTON TIMER 0R COUNTER Jan. 7, 1964 2 Sheets-Sheet 1 Filed Feb. 13, 1961 INVENTOR.

PHYLLIS D. PAGE ATTORNEY Jan. 7, 1964 P. D. PAGE PUSH BUTTON TIMER 0R COUNTER 2 Sheets-sheaf, 2

Filed Feb. 15, 19s;

IN V EN TOR. PHYLLIS D. PAGE ATTORNEY United States Patent 3,117,191 PUSH BUTTON TIMER 0R COUNTER Phyllis Dillman Page, Aldan, Pa., assignor to Automatic Timing & Controls, Inc., King of Prussia, Pa., a corporation of Pennsylvania Filed Feb. 13, 1961, Ser. No. 88,877 12 Claims. (Cl. Nth-39) This invention relates to timing or counting devices and in particular to such devices actuated by pressure on a pushbutton.

Timing devices are of many types including those having a rotating indicator which is coupled to a rotary driving means. An example of such a device may be found in US. Patent No. 2,885,001 to E. Brown issued on May 5, 1959. The operation of the timer disclosed in that patent was initiated by an external electrical switch which actuated a solenoid of a relay which, in turn, operated a clutch for coupling the indicator to the rotary driving means. The necessity for this switch plus the relay and the wiring incident thereto tends to make this type of timer relatively complicated and expensive.

It is therefore an object of the present invention to provide a novel timer which does not require actuation by an external electrical switch.

Another object of the present invention is to provide a timer which can be constructed at lower cost than those hitherto available.

Another object of the present invention is to provide a relatively simple timer mechanism.

Yet another object of the invention is to provide a timer of relatively simple construction which may easily be disassembled for adjustment or repair.

Other pushbutton timers are known in which the timer motor energization circuit is directly coupled electrically to the load circuit under control. This arrangement has a number of disadvantages such as, for example, the impossibility or impracticality of controlling a 220 volt device from the timers 110 volt motor.

Another object of the invention is to provide a timer in which provision is made for independence of the timed load circuit from the timer motor circuit.

Another object of the invention is to provide a timer which may easily be disassembled for maintenance and repair.

Yet another object of the invention is to provide a simple latching mechanism for revolution counters, electrical impulse counters and the like.

Still other objects of the invention will appear from a perusal of the specification, drawings, and claims herein.

In accordance with my invention I provide a pushbutton-actuated timing device wherein pressure on the pushbutton moves an actuating member having a selected number of fingers into position to actuate a corresponding selected number of switches which energize the timers motor and the controlled load circuits. The pressure on the button causes a latch to lock the actuator in the switch actuating position. At the same time, the latch locks a time indicator hand into engagement with a clutch thereby causing the hand to commence rotation due to the action of the timer motor. At the end of the desired timing cycle, the indicator hand operates a latch release assembly which releases the actuator. The released actuator simultaneously releases the switches thereby cutting off the timer motor and the timed load circuit, and also uncouples the indicator hand from the clutch. In another form of the invention, the device is used as a revolution counter by dispensing with the driving motor (and switches, if desired) and coupling the clutch to an external rotating member whose revolutions are to be counted or limited. In yet another form the device may be used to count a preselected number of electrical im- 'ice pulses by making the driving motor a pulse-actuated stepping motor.

Whatever the particular form the embodiment of the invention may take, the clutch assembly is so coupled to the latching mechanism that it may be disengaged therefrom by a simple vertical movement thereby enabling the timer to be separated into two parts for ease of maintenance or repair.

FIGURE 1 is an exploded, partly-sectional, and isometric front view of the novel timing device herein;

FIGURE 2 is a front elevation view of the timer with its indicator and stop hands and part of its faceplate shown in phantom;

FIGURE 3 is a side elevation and partly-sectional view of the timing device taken along the section line 33 in FIG. 2 and showing details of the faceplate, knob and pushbutton assembly.

FIGURE 4 is a plan view taken along the section line 44 of FIG. 3 showing the latching mechanism in the switch actuating position and the tripping assembly;

FIGURE 5 is a plan view also taken along the section line 44 of FIG. 3 showing the latching mechanism in the non-actuating position and the tripping assembly; and

FIGURE 6 is a plan and partly sectional view taken along the section line 6-6 in FIG. 2 which shows details of the indicator shaft as related to the switch actuator mechanism.

Referring primarily to FIGURE 1, but also to the other figures a faceplate 11 may be made of an appropriate molded thermoplastic material having formed thereon, as by embossing, numerical indicia representing, for example, selected time intervals such as seconds and fractions thereof. Alternatively, the faceplate may be completely transparent and there may be a dial with indicia printed on the mounting plate 35. A knob 13 is provided which is fixedly connected (as by a set screw, not shown) to a shaft 14 that passes through an aperture in the faceplate 11. On the other side of the faceplate a setting hand 15 is connected to a shaft 14. Mounted coaxially with the knob and shaft 14 is a pushbutton 20 which is normally urged outward by a spring 21 which encircles a shaft 22 attached to the pushbutton. The shaft 22 passes through a round opening in the shaft 14, the shaft 22 being prevented from moving out of the bore of shaft 14 by a retaining ring 23 (FIG. 3) or equivalent device located at the end of shaft 22.

Indicator and Clutch Assembly A time-indicating hand 25 is fixedly mounted to the end of a shaft 26 which passes through an aperture 27 in a disc-shaped clutch 30. The edge of the disc 30 has a hollowed out portion 31 in which is set a resilient 0- ring 32 made of rubber, or the like. The foregoing general construction is largely shown and described in US. Patent 2,885,001 issued to E. R. Brown on May 5, 1959 and possesses numerous advantages among them being greater resolution. When the timer is actuated the flanged detent portion 25a bears against the O-ring 32 in a manner to be described below. The disc 30 is connected to a hollow shaft 29 (FIG. 3) which extends through the mounting plate 35, the other end of the hollow shaft 29 being fixedly attached to a driven gear 36. The gear 36 also has a central aperture to permit passage of the shaft 26 therethrough.

The shaft 26 is also coupled by means of cylindrical member 37 mounted fixedly thereon to a spiral ring 40 whose other end is fixedly connected about a member 42 protruding from the rear surface of plate 35. Thus, as the time indicator hand 25 and its shaft 26 are moved in a clockwise direction, the spring 40 exerts a counterclockwise torque thereupon. When the hand 25 is disi/ engaged from the clutch disc 30 it is the spring 40 which resets the hand 25 into contact wtih setting hand 15.

To the rear of the spring 40 there is fixedly connected to shaft 26 a cylindrical collar 44 on the left (or forward) side of an actuating leaf member 50. On the right (or rear) side of actuator 50 a T-sectioned washer 45 (see FIGS. 3 and 6) is located which is urged into contact with collar 44 through a keyhole aperture 52 in actuator 50 by the action of spring 54. The spring is moored against a washer 56 which is kept in place by a retaining ring 57 in the groove 58. The spring 54 aids in returning the shaft 26 to its forward position once the timing cycle has been completed. It also helps to keep the hand 25, when the pushbutton is depressed, into contact with the O-ring 32 even if the dimensions of those two members are not strictly according to predetermined specifications. The aperture 52 consists of a lower, essentially circular aperture 52a which overlaps somewhat on a higher, somewhat smaller, mostly circular aperture 52b through which the shaft portion 26 passes (see FIG. 6) when the timer is operatively assembled. The aperture 52 is constructed in this fashion for reasons which will be explained in more detail below. It will be noted that the actuator 50 is provided with a number of hemispheric protuberances or bosses 46 (FIG. 6). These bear against the rear surface of collar 44 and the front flanged surface of washer 4S and are inserted to lessen the friction between these surfaces which might otherwise impede free rotation of the shaft 26.

The actuator 54 pivots about a pin 51 which passes through aligned apertures in its rearwardly-extending flanges 53 and is normally biased outwardly by a spring 55 (FIGURE 3). The actuator has two

fingers

63 and 64 which are angled somewhat and which depress the

buttons

65 and 56 of

switches

70 and 71 respectively when the actuator 59 is moved backwards. The

switches

70 and 71 are mounted on the front surface of a circular terminal block 85 in which a desired number of terminal screws are located for connection to switches 74) and 71 and to external circuits to be controlled.

Clutch Drive Assembly The indicating hand 25 and its shaft 26 are not part of the clutch drive system which comprises the driven gear 35, the driving gear 62, shaft 61 and motor 60. The motor 60 drives the indicator hand 25 by means of a drive shaft 61 which passes through the insulating terminal block 85. To the shaft 51 is attached a driving gear 62 which meshes with the driven gear 36. When the motor 60 is energized by the actuation of one of the

switches

76 or 71 the gear 62 turns counter-clockwise (as seen from the faceplate) causing the gear 36 and the disc member 30 fixedly connected thereto to revolve in a clockwise direction.

Setting of the Timer It will first be assumed that the setting knob 13 is rotated by the operator so that the stop flange 15a of member 15 is located opposite the numeral on the faceplate 11. With the motor 64) de-energized the indicator hand 25 is normally biased in a counter-clockwise direction because of the action of spring 45 since the hand 25 and its flanged detent portion 25a do not engage the resilient O-ring 32. The hand 25 is pushed forward out of contact with the disc 39 by the action of the spring 55 which urges the actuator 50 forward when the pushbutton 20 has not been depressed. Thus the indicator 25 will have rotated counter-clockwise until it comes to rest in contact with the detent flange a of the member 15.

Starting the Timer When the operator of the timing device depresses the pushbutton 25 its associated shaft 22 pushes the indicator shaft 26 toward the right (backward) which in turn causes the collar 4-4 to pivot the actuator 51 backwards. The backward movement of the actuator 50 has two main effects. First, the

actuator fingers

63 and 64 depress the buttons 55 and 66 (FIG. 6) respectively of the

switches

75 and 71. The actuation of the switch 70, for example, may cause the timer motor 6% to be energized so that the shaft 61 rotates the disc 30 via

gears

62 and 36. The actuation of switch 71 may, for example, initiate the operation or energization of the circuit being controlled. Second, the movement of the actuator toward the right also causes the detent 25a to bite into the resilient O-ring 32 so that it will move with the disc 39. Unless the shaft 26 is locked into its backward position, however, the actuator 50 will move forward again because of the bias spring 55.

Latelzing Mechanism To lock the shaft 26 and the actuator 50 into the backward position once the pushbutton 20 has been depressed a bifurcated latch 30 is provided which pivots about a pin 78. This latch 8% passes through an essentially rectangular aperture 75 toward the top of the actuator 5t). Cut into one of the edges of latch 85 are a shallow forward notch 76 adjacent a deep rearward notch 77.

The latch 84) (see also FIGS. 4 and 5) is urged toward the right by a tension spring 79 one of Whose ends engages an aperture therein, and whose other end is fastened to a projection 81 that is part of a mounting plate 82 which is aflixed to the terminal block 85. Thus, when the actuator 5th is moved to the rear by the axial movement of shaft 26 the inner right edge of the aperture 75 will engage the deep notch 77 thereby locking the actuator in the switcl -actuating position and simultaneously cocking a tripping mechanism.

"Tripping [Mechanism It will be seen that the latch 85 has two finger-shaped portions 81; and 87 through which a vertical pin 88 extends. The pin 83 is mounted fixedly in a block 89 which moves pivotally about a pivot member 95 in a generally horizontal direction. The pivot member 94) is fixedly connected to the upper surface of a horizontal portion 82a of the mounting plate 82. On one side of the block 89 is fixedly mounted a trip arm 91 which protrudes through an aperture 92 in the plate 35. To the right of the arm 91 (as seen from the front) there is a solid protruding member 93 fixed (or formed in) the plate 35 for limiting the movement of the trip arm 91 toward the right.

When the actuator 50 is moved to the switch-actuating position, i.e., when its aperture 75 engages the deeper notch 77, the pivotal movement of the latch 80 toward the right causes the pin 88 to move in the same direction which, in turn, causes the block 89 to pivot so that the trip arm 91 is moved to the left where it coincides with the 0 on the faceplate 11.

Operation When the button 2th is depressed and the actuator is locked in its rear (deeper notch) position (FIG. 4) the switch 70 starts t e motor which turns the shaft 61 cansing the gear 62 to rotate whereupon the disc 30 rotates with the hand 25 which has been brought into locking engagement with the resilient member 32. Since the gear 36 moves in a clockwise direction, the indicator 25 will move similarly until at 0 its detent 25a nudges the protruding trip arm 91 toward the right. When this happens, the block 89 will pivot counter-clockwise (as seen from above) so that the pin 88 will be urged to the left thereby causing the latch 81) to pivot toward the same direction. When the latch 80 moves toward the left, the actuator 50 is urged outward by the action of the bias spring (and spring 54) until the inner right hand edge of the aperture 7 5 is locked in the shallower notch 76. The movement of the actuator 59 away from the switches 70 and '71 causes the

fingers

63 and 64 to release the buttons and 65 so that the switches '75 and 71 are no longer actuated. De-energization of the switch cuts off the motor 50 and hence the gear 62 no longer drives the disc 30. Also, at the same time, the outward movement of the actuator 50 due to spring 55 has caused the collar 44 and shaft 26 to move in an outward direction and thus the indicator hand 25 no longer engages the clutch disc 30 with the result that the indicator member 25 is free and is urged to the pre-set stop position of the arm 15 by the counter-clockwise torque imparted to the shaft 26 by the spiral spring 40.

Disassembly One of the important features of the present invention is the provision for rapid and simple disassembly of the apparatus. Actually, the timer may be considered to consist of two main parts. The first consists of the forward half of the timer, i.e., the faceplate and knob mechanism, the clutch, indicator hand and shaft assembly, and the spring 40. The second part i.e., the rear part of the timer may be considered to consist of the actuator, the latch, the trip mechanism, the terminal block, and the motor. Separation of the two parts from one another once the outer cover (not shown) is taken off may be accomplished by removing the spacer studs (FIG. 2) (which, for example, may be screwed into the terminal block) and then slipping out the front portion by moving it downward so that the eyelet member 45 is able to pass through the aperture 52a, then pulling the front section forward. The simplicity of this disassembly permits fast and easy access to both parts for maintenance or repair. Reassembly is similarly facilitated.

Use in Revolution Counter While the invention has been explained in terms of a timing mechanism, it should be kept in mind that it has uses in other types of devices as well. Thus, for example, it may be used in so-called revolution counters which are designed to measure the number of revolutions of a rotating body until a predetermined number of them cause the termination of an operation or the commencement of another.

When used as a revolution counter, the device would differ from the one illustrated herein in the following main ways. First, there would not be a motor 60 to drive the shaft 61 but instead the shaft 61 would be coupled as by an intermediate gear system to the mechanism whose revolutions are to be counted. Furthermore, the actuator 50 need not necessarily have any fingers such as the

fingers

63 and 64 unless, the actuator 50 is intended, at the end of the count of the predetermined number of revolutions to stop or otherwise govern the device whose revolutions are being counted or to initiate or terminate another electrical operation. Of course, depending upon the nature of the apparatus or equipment being counted by the counter, the indicia on the faceplate 11 would be correspondingly modified. In most other salient characteristics, the structure and operation of the mechanism would be essentially the same as when it performed as a timer. The operator would set the setting knob 13 to the desired number of revolutions, since the shaft 26 would be pushed forward so that the hand 25 did not engage the clutch ring 32 the hand 25 would follow the setting of the detent 15a. When the operator pushed in the button the shaft 26 would cause the collar 44 to bear against the actuator 50 which would then lock into the deeper notch 77 thereby pushing the trip arm 91 over into alignment with the O marked on the faceplate 11. At the same time indicator hand would be locked into engagement with O-ring 32. As the shaft 26 was pressed rearward the switch 70 could, for example, cause the shaft whose revolutions are to be counted to commence rotation. As the latter shaft turned it would cause similar rotation of the shaft 61 which would drive the disc 30 and the hand 25 which would begin to indicate on the faceplate 11 the remaining number of revolutions in the cycle. Upon completion of the cycle, the detent 25a would nudge the trip arm 91 toward the right whereupon the latch 80 would release the actuator which would then be urged forward by spring and the switch would be shut off thereby de-energizing the source of power for the shaft whose revolutions were counted. If another switch is used in conjunction with the switch 70 the former could, at the end of the cycle, energize a signal such as a light or hell, for example.

Impulse Counter The invention could also be used in an electrical impulse counter. For this purpose the structure would be essentially the same as that shown except that it would be provided with a stepping motor which would revolve the shaft 26 only by incremental steps corresponding to electrical pulses applied to the motor. The motor could consist of a solenoid to which the impulses would be applied, there being an armature within the solenoids internal field which would be moved axially by the fields set up by the current pulses. The armature would be coupled by an appropriate mechanical linkage to a two-toothed pallet which would drive, first with one tooth, then the other, a toothed wheel mounted coaxially on the end of a shaft. This shaft would drive, directly or indirectly (through gears) the shaft 61 to advance the indicator hand a discrete amount for each impulse. After a predetermined number of impulses the hand would trip the latch release mechanism as explained above.

Still other forms of the invention are possible which do not depart from the essence of this invention and will occur to those skilled in the art upon reading of this specification. Consequently, this invention should be limited only by the claims herein.

I claim:

1. In combination: a rotating member mounted on a shaft, clutch means, rotary driving means coupled to said clutch means, a member coupled to said shaft and responsive to axial movement thereof in a first direction by corresponding movement primarily in said direction, said member normally being biased in a direction opposite the said first direction, latching means mounted for movement substantially transverse to the axial movement of said shaft for locking said biased member and said shaft in a predetermined position when said shaft is moved in said first direction, said rotating member thereupon being brought into locked engagement with said clutch means whereupon rotary motion imparted to said clutch means by said driving means may be transmitted to said rotating member, and means responsive to movement thereof by said rotating member for releasing said latch whereupon said biased member is urged in a direction opposite said first direction and causes said shaft and said rotating member to be disengaged from said clutch.

2. The invention according to claim 1 wherein said clutch means has a first geared portion, wherein said rotary driving means includes a motor assembly having a second geared portion which meshes with said first geared portion and drives the latter portion when said motor is energized, and wherein said rotating member indicates the expiration of a predetermined time interval.

3. The invention according to claim 1 wherein said clutch means has a first geared portion, wherein said rotary driving means includes a currentdmpulse stepping motor assembly having a second geared portion which meshes with said first geared portion and drives the latter when the motor is energized by said impulses, and wherein said rotating member indicates a number of said impulses.

4. The invention according to claim 1 wherein said rotary driving means includes means for coupling said driving means to an external rotating body whose revolutions are to be counted and wherein said rotating member indicates a number of said revolutions.

5. The invention according to claim 1 wherein means are provided coaxial with said shaft for exerting axial pressure on said shaft.

6. The invention according to claim 1 wherein said biased member is substantially planar and pivotally mounted and wherein said latching means includes a substantially planar pivoted member which has at least one notch therein which engages an edge of said biased member to lock the latter in said predetermined position.

7. The invention according to claim 6 wherein said latching means is normally biased in a second direction substantially perpendicular to said first direction, and wherein said releasing means, in response to movement of said rotating member, moves said latching means in a direction opposite said second direction thereby permitting said biased member to move in the direction of its normal bias.

8. The invention according to claim 6 wherein said biased planar member has a selected number of switchactuating portions and wherein a selected number of switches are disposed in proximity to said actuating portions and adapted to be actuated thereby.

9, An indicating device comprising: at least one switch for controlling selected circuits, means movable primarily in a first direction for actuating said switch by pressure thereupon, means movable in a second direction substantially perpendicular to said first direction for locking said actuating means in either of two positions, one of said positions being one in which said switch is actuated and the other being one in which said switch is not actuated, means including a shaft for moving said actuating means in said first direction, an indicator coupled to said shaft, means responsive to pressure in said first direction for causing said moving means to move in said first direction whereupon said locking means locks said actuating means in said actuating position and said indicator is moved into locked contact with a rotary member, means responsive to actuation of said switch for rotating said rotary member and said indicator, and means responsive to movement by said indicator for releasing said locking means at the end of a predetermined rotary movement of said indicator in a given direction whereupon said actuating means reverts to the position in which said switch is not actuated and said rotary member ceases rotation in said given direction.

10. A timer comprising: a switch for controlling an operation to be timed, an actuator member mounted to move in a first direction into contact with said switch for actuating the latter, means for normally biasing said actuator to move in a second direction opposite said first direction thereby to prevent said contact, latch means mounted to engage said actuator and to limit its movement in said first and second directions, said latch means normally being biased in a third direction substantially perpendicular to said first and second directions, said latch means locking said actuator into actuating contact with said switch upon predetermined movement of said actuator in said first direction, a rotating time indicator means, means coupled to said indicator means and to said actuator for moving said actuator in said first direction thereby to cause said latch to lock said actuator into contact with said switch, a device for transmitting pressure in said first direction to said last named moving means, and means responsive to movement by said indicator for moving said latch substantially in a fourth direction opposite said third direction whereupon said actuator is moved in said second direction by said bias applied thereto and said switch-actuating contact is broken.

11. A timer comprising: a rotatable hand mounted on a shaft, a rotating clutch member having resilient means thereupon and having a central aperture through which said shaft passes, first and second pressure sensitive switches, an actuator member pivotally mounted near said switches and being normally biased to pivot in a direction away from said switches, said actuating member having two fingers which press against said switches when said member pivots toward said switches, a coupling between said shaft and said actuator member for impelling said actuator to pivot toward said switches in response to axial movement of said shaft toward said switches, said actuator member having an aperture therein, a bifurcated latch passing through said aperture and having a selected number of notches therein, said latch being mounted to pivot substantially transversely to the axial movement of said shaft and being biased in a direction such that one of said number of notches engages an edge of said aperture, said latch, in response to movement of said shaft axially a predetermined distance, locking said fingers into pressure-exerting relation on said switches for actuating the same, said arm being simultaneously locked into pressure-exerting relation on said clutch member, means coaxial with said shaft for transmitting pressure to said shaft to move the shaft axially, means including a pin passing through the bifurcated portion of said latch for responding to movement by said rotating arm by causing said latch to pivot opposite its normal direction of bias, said actuator thereupon being impelled away from said switches and released from pressure thereupon, said latch thereafter engaging said aperture edge to limit the movement of said actuator, said movement of said actuator also causing said shaft and hand to move similarly whereupon said hand is disengaged from said clutch.

12. In combination: a rotating member coupled to a shaft, clutch means, means including rotary driving means coupled to said clutch means for causing said clutch means to rotate, a member coupled to said shaft which responds to axial movement thereof in a first direction by corresponding movement primarily in the same direction, latching means for locking said member when moved a predetermined distance in said first direction, said rotating member thereupon being brought into locked engagement with said clutch means whereupon rotary motion imparted to said clutch means by said driving means is imparted to said rotating member, and means responsive to said rotating member in motion for mechanically releasing said latch whereupon said biased member is urged in a direction opposite said first direction thereby disengaging said rotating member from said clutch.

References Cited in the file of this patent UNETED STATES PATENTS 2,025,511 Johnson Dec. 24, 1935 2,697,984 Kurek Nov. 2, 1937 2,585,018 Kreitchman et al. Feb. 12, 1952 2,996,585 Lehde Aug. 15, 1961

Claims

1. IN COMBINATION: A ROTATING MEMBER MOUNTED ON A SHAFT, CLUTCH MEANS, ROTARY DRIVING MEANS COUPLED TO SAID CLUTCH MEANS, A MEMBER COUPLED TO SAID SHAFT AND RESPONSIVE TO AXIAL MOVEMENT THEREOF IN A FIRST DIRECTION BY CORRESPONDING MOVEMENT PRIMARILY IN SAID DIRECTION SAID MEMBER NORMALLY BEING BIASED IN A DIRECTION OPPOSITE THE SAID FIRST DIRECTION, LATCHING MEANS MOUNTED FOR MOVEMENT SUBSTANTIALLY TRANSVERSE TO THE AXIAL MOVEMENT OF SAID SHAFT FOR LOCKING SAID BIASED MEMBER AND SAID SHAFT IN A PREDETERMINED POSITION WHEN SAID SHAFT IS MOVED IN SAID FIRST DIRECTION, SAID ROTATING MEMBER THEREUPON BEING BROUGHT INTO LOCKED ENGAGEMENT WITH SAID CLUTCH MEANS WHEREUPON ROTARY MOTION IMPARTED TO SAID CLUTCH MEANS BY SAID DRIVING MEANS MAY BE TRANSMITTED TO SAID ROTATING MEMBER, AND MEANS RESPONSIVE TO MOVEMENT THEREOF BY SAID ROTATING MEMBER FOR RELEASING SAID LATCH WHEREUPON SAID BIASED MEMBER IS URGED IN A DIRECTION OPPOSITE SAID FIRST DIRECTION AND CAUSES SAID SHAFT AND SAID ROTATING MEMBER TO BE DISENGAGED FROM SAID CLUTCH.