US2776009A - Timer switch - Google Patents

Description

Jan. 1, 1957 v. E. TAMBURR TIMER SWITCH 2 Sheets-Sheet 1 Filed Nov. 19 195] 11w 'EN TOR. V/CTOR 5. 7214450191? '3 emz v.

ATTO/P/VE) United States Patent TIMER SWIFRCH Victor E.'.'1 amburr, 'Passaic, N. 'J., assignor to Industrial Timer'Corporation, Newark, N J.

A lication November :19, 1&5-1,SerialrNo.1257,085

SClaiims. cl. 161-1 The present invention .relates to timer switches and particularly 'to'ra timer switch immediately actuable upon amom'enta'ry actuation of its starting means.

The 'timer switch may 'be used, among other purposes, for'timing'thedischarge of a fire extinguishing fluid into a compartment either to extinguish fire therein or to provide an "atmosphere incapable of supporting combustion. It is important that the timer switch positively function under such conditions, and it is also important that there need be no necessity for a prolonged closing of a relay circuit when starting. In order that the system be as dependable as possible and for easy maintenance, it is desirable that the holding circuits ordinarily required be eliminated. However, for such installations it is necessary that operation be started by a momentarypush on a starting button or a'flick of a switch at a remote con- 'trollocation.

"In accordance with the invention this is accomplished by providing a timer switch in which a mechanical locking'means'positively holds the timer circuit closed during the operating cycle. In a preferred construction, this is done by including a switch holding cam member having 'a recessed portion closable by a blocking member releasable by momentary actuation of a starting means.

Another object of the invention is to provide a timer switch which is simple and economical in manufacture, positive and rapid in operation, and durable in use.

Other objects and advantages of the invention will be apparent from the following description and from the accompanying drawings which show, by way of example, an embodiment of the invention.

In the drawings:

Figure 1 is a perspective view of a timer switch in accordance with-the invention.

Figure 2 is a plan view of the timer switch.

Figure 3 is a perspective view of the timer switch control cam assembly.

Figure 4 is a view of one end of the timer switch control cam assembly.

Figure 5 is a view of the other end of the timer switch control 'cam assembly with the blocking member not shown.

Figure '6 is a side view of the timer switch control cam assembly.

Figure 7 is an end view of the blocking member.

Figure 8 is a side view of the blocking member.

Figure 9 is a front view of the switch and its operating member.

Figure 1-0 is a side view of the switch operating member.

Figure 11 is .a perspective view of the actuating member starting the operation of the timer switch.

Figure 12 is a plan view of the actuating member.

Figure 13 is a side view 'of the actuating member.

Figure 1-4 is a wiring diagram 'ofthe timer switch and a circuitincorporating-same.

Referring to the drawings there is shown in Figure 1 2,776,009 Patented Jan. 1957 2 a timer switch 1 in accordance with the inventionincluding amounting base 2, asynchronous timer motor 3, switches 4 and 5, a relay '6, a switch cam assembly 7, and a control cam assembly8.

Themounting base 2 is preferably sturdily made of a steel stamping having itscenter portion 10 slightly raised with respect to .its edges 1'1 and 1 2. The'base 2 is perforated as indicated at 14 for the mounting thereof on a'support.

Thesynchronous itimer motor 3 is of the conventional type including a reduction .gear assembly '15 driving agear 16. A gear and rack assembly 17 maybe changed by removing a screw '19 'for the insertion of substitute assemblies having 'diiferentgear ratios to engage between thegear 16 and agear 20 carried by a main shaft .21 for the rotationof the switch and control cam asserriblies'7 and 8. Theshaft 21 is supported at one end by an L-s'haped member '22'havi'ng an adjustable bearing means 24 positioned therein. The other end of the shaft '21 is supported by a bearing 25 carried on an L-shaped bearing wall 2'6 which also provides the support for thesynchronous motor assembly 3 and for the gear and rack assembly 17.

The switches 4 and 5 may be alike and maybe of the single pole double-throw snap action type totally enclosed and dustproof and may include a spring member tending'to maintain the contacts in a predetermined'position. A preferred switch is the micro-switch, type W, but any other switch may housed, the casing of which may have channeled-like edges 27 to pivotally receive apin 29 "for the pivotal mounting of an operating 'member 30, shown in detail in Figures 9 and I0, and which includes a projecting portion 31 adapted to extend inwardly towards the switch to receive a spring it such is desired. An outwardly turned tip end '32 is adapted to engage the cam assembly as will 'be 'hereafter described. Suitable connection means may be positioned on the rear of the switches '4 and 5 for connection in an electrical'circuit as illustrated. in Figure '14.

Two switches 4 and 5 are shown although the timer maybe made usingonly 'switchs 'or the base and shaft 2'1 may be extended to provide additional switches 4 and control cam assemblies.

Depending upon the service desired, the switch cam assembly '7 may be designed providing for different time intervals of switch action for each revolution of the cam assembly. An adjustable cam assembly is shown in which the main cam 'edge 34 is made integrally with or attached to an indicatingcylinder 35. Positioned thereagainst is asecond disc 36 separately journalled on theshaft 21 through bearingmember 37. The peripheries of thediscs 34 and 36 may be cut away for'one-"hal'f of their length. The discs may then be adjustably angularly positioned with respect to each other and looked together 'by meansof ascrew'and lock washer 39 secured to disc 34 and extending through 'a slot 40 indisc 36. 'By varying the angular position of the discs '34 and S6 with respect to each other, the cam shape provided by the edges of the composite discs may be varied. The *edge of the switch cam 7 is adapted to engage with a switch operating member ll to actuate the switch 4, theoperating arm 41 maybe madeofthe-sameconstruction as theoperating member 3% for the switch 5.

The control cam assembly 8 shown in detail in Figures 3 through 6 includes -'adisc 43 attached in position "on theshaft 21 for rotation therewith by a nub =44. The edge of thedisc 43 is notched as indicated at 45 and aper tured at =46 to receive a pin orstud 47 with an enlargedhead 49. A blockingmember 50 shown in detail in Figures 7 and 8 is madeof a thin piece *o'f material having oneend 51 recessed with a curvature approximately of the same radius as the exterior of thehub 44 for thedisc 43.Outer end 52 of the blocking member is flared for a purpose later to be described. The blocking member so is secured in position on thedisc 43 by threaded or riveted engagement of thepin 47 in the opening 46. A smallspiral spring 54 is engaged between thehead 49 of thepin 47 and the blockingmember 50 to yieldingly urge the blocking member against the side of thedisc 43 so as to close thenotch 45.

As may be seen in Figure 4, theouter end 52 of the blockingmember 50 extends outwardly with respect to the edge or periphery of thedisc 43 and the trailing end of theedge 55 coincides with the periphery of thedisc 43. The leading edge orouter end 52 of the blockingmember 50 not only projects radially of the disc 4-3, but is also flared axially with respect thereto as may be seen in Figure 3.

Therelay 6 is of the conventional type having a coil and a pivotally mountedarmature 61 with anadjustment screw 62 extending through the end thereof.

Therelay 6 is used to start the action of the timer and is adapted to move an actuatingmember 64, shown in detail in Figures 11-13. The actuatingmember 64 is pivotally supported by apost 65 extending from the side wall of the switch 5 or from apartition member 66 extending upwardly from thebase 2. The actuating member 64- is apertured as indicated at 67 to receive a bearing pin threadedly or otherwise suitably engaged in thepost 65. The actuatingmember 64 may be made of a stamping witharms 70 and 71 formed substantially at right angles with respect to each other. Thearm 70 has an upwardly extendingextension 72 of a length so that when the actuating member is in position, theend 72 will contact the outwardly extendingend 32 of theoperating member 30. Theother arm 71 of the actuating member 6-4 has a turned-over end 74 of a length so as to be contacted by theadjustment screw 62 ofrelay 6.

Any suitable electrical connections may be made be tween the parts of the timer switch. In Figure 14 there is shown a diagram of connections which may be made utilizing the switch 5 as the starting means of thesynchronous motor 3, while the switch 4 is used for connection to any external apparatus (not shown), such as for example, an electrically operated discharge valve of a fire extinguishing system or other device electrically controlled. As shown in the diagram, a pair of terminals are adapted to be connected to a source of electric supply, awire 82 connectssupply 80 to one terminal ofcoil 60 of therelay 6, the other terminal of thecoil 60 being connected by awire 84 to asuitable starting switch 85 which may be of the push button type, with its other terminal connected to the supply by awire 86. Switches 4 and 5 are of the single pole double throw type having center points 87 and 89, normally closed contacts 9i) and 91, and normallyopen contacts 92 and 94. The center points 87 and 39 are respectively connected to thesupply wire 82 byleads 95 and 96. Terminal 91 of switch 5 is not used in the diagram as shown. Normally open contact 94 is connected to one terminal of thesynchronous motor 3 by alead 97, the other terminal of themotor 3 being connected to thesupply line 86 by alead 99. Suitable leads and 101 may be connected fromcontacts 90 and 92 to any desired outside apparatus to be controlled by the timer switch 1, acommon lead 102 being connected to wire 86.

In the operation of the timer switch 1 it is connected to a source of electrical supply andpush button switch 85 momentarily depressed to energize thecoil 60 of therelay 6. Movement of thearmature 61 causes the contact of theadjustment screw 62 with the extension 74 of the actuatingmember 64 to pivot the actuatingmember 64 againstextension 32 of the operatingmember 30, thus, moving the tip of theextension 32 out of thenotch 45 allowing the blockingmember 50 to come in contact with 4 the side of thedisc 43 so as to close thenotch 45 and prevent the tip of theextension 32 from moving back into thenotch 45 if therelay 6 is only momentarily energized, the inward movement of theextension 32 actuating switch 5 into the closed position. A circuit is thus completed energizing themotor 3 to rotate theshaft 21 and the cam assembly 7 and 8. As cam assembly 8 rotates the flarededge 52 of the blockingmember 50 wipes againstend 32 of the operatingmember 32 deflecting the blockingmember 50 away from thedisc 43 so that theextension 32 moves into thenotch 45 thereby opening the switch 5 and the circuit to themotor 3. It should be noted that any override of thecam assembly 3 due to inertia is braked by the engagement of theextension 32 with the wall of thenotch 45.

As thus far described, the timer switch 1 is positioned ready for a timed operation, the duration of which will depend upon the designed speed of the motor and its gear ratio with respect to theshaft 21. in this ready position it should be remembered that the blockingmem ber 50 is held away from thedisc 43 by its engagement with the side ofextension 32. In starting a timed cycle of operation, thepush button 85 is againdepressed actuating relay 6 to pivot the actuatingmember 64 and move theextension 32 of the operatingmember 30 inwardly towards the switch 4 and out of thenotch 45, thereby allowing the blockingmember 50 under the action of its spring 5 to move into position against the side of thedisc 43 to close the notch :35. If the push button is immediately released, the actuatingmember 64 will fall away fromextension 32 of the operatingmember 30, however, by reason of the movement of the blocking member St into position against thehub 44, a complete edge is presented for thedisc 43 in that theedge 55 of the blocking member 59 is now in position against theextension 32 so as to hold the switch 5 in the closed position. The rotation of theshaft 21 then continues until the blockingmember 50 is deflected as above described allowing theextension 32 to again fall into theslot 45 opening the switch 5 and completing the timed cycle. As the cam assembly 7 rotates with theshaft 21, the switch 4 is likewise actuated for the desired portion of the timed interval depending upon the set positions of the discs 34- and 36 for the control of an external device connected to the wires 1(ii 102.

While the invention has been described and illustrated with respect to specific embodiments thereof, it will be understood that other embodiments may be resorted to without departing from the invention. For example, while thenotch 45 has been shown as on the periphery of thedisc 43, an alternative construction may be provided in which a notch is provided on the surface of the disc suitable modification being made of the operatingmember 32 so as to function as heretofore described. Alternatively, another construction may be utilized in which two or more pins extend from the side of thedisc 43, the space between the pins closed by a blocking member of cylindrical or equivalent construction. Likewise, while the blockingmember 50 has been described as being carried by a pin on the face of thedisc 43, an alternative construction for the support thereof might take the form in which the blocking member is pivotally supported about theshaft 21, being spring'urged against thedisc 43 as above described. Further, while only one notch has been shown on the periphery of the disc .3, additional notches and blocking members might be provided if warranted by desired conditions. Therefore, the form of the invention as set out above should be considered as illustrative and not as limiting the scope of the following claims.

I claim:

1. An electrical circuit controller for use in a timer switch of the type in which a notched cam is rotated at predetermined speed when an electric circuit condition is established and a cam follower rides on said notched cam to establish said condition when it is moved out of said notch, the controller comprising a notched cam, a cam follower, and a blocking member axially mounted with respect to said notch in one position to normally overlay substantially the entire extent thereof and to define with the remaining surface of the cam a complete cam surface to hold said follower free from the notch, the cam follower operable to urge said blocking member in an axial direction with respect to said notch to allow said follower to enter said notch to change the electric circuit condition.

2. An electrical circuit controller for use in a timer switch of the type in which a notched cam is rotated at predetermined speed when an electrical circuit condition is established and a notched cam follower rides on said cam to establish said condition when it is moved out of said notch, the controller comprising a notched cam, a cam follower, a blocking member, and a guiding memher for the axial support of the blocking member on the cam with respect to said notch in one position to normally overlay substantially the entire extent thereof and to define with the remaining surface of the cam a complete cam surface to hold said follower free from the notch, the cam follower operable to urge said blocking member in an axial direction with respect to said notch to allow said follower to enter said notch to change the electrical condition.

3. An electrical circuit controller for use in a timer switch of the type in which notched cam is rotated at predetermined speed when an electrical circuit condition is established and a notched cam follower rides on said cam to establish said condition when it is moved out of said notch, the controller comprising a notched cam, a cam follower, a blocking member, a guiding member for the axial support of the blocking member on the cam with respect to said notch in one position to normally overlay substantially the entire extent thereof and to define with the remaining surface of the cam a complete cam surface to hold said follower free from the notch, and a flared leading edge for the blocking member, the cam follower operable to engage the flared edge to urge said blocking member in an axial direction with respect to said notch to allow said follower to enter said notch to change the electrical condition.

4. An electrical circuit controller for use in a timer switch of the type in which a notched cam i rotated at predetermined speed when an electrical circuit condition is established and a cam follower rides on said notched cam to establish said condition when it is moved out of said notch, the controller comprising a notched cam, a shaft for the notched cam, a cam follower, a blocking member, a flared leading edge for the blocking member, the blocking member having a pair of inwardly directed extensions to extend about the shaft, the blocking member having an opening therethrough, a guiding pin extending from the notched cam through the opening in the blocking member for the support of the blocking member, an enlarged head for the pin limiting the axial movement of the blocking member with respect to the notched cam, and a spring yieldingly urging the blocking member towards the notched cam in notch overlying relationship to define with the remaining surface of the cam a complete cam surface to hold the cam follower free from the notch, the cam follower operable to engage the flared edge to urge the blocking member in an axial direction with respect to said notch to allow said cam follower to enter the notch to change the electrical condition.

5. A controller for use with an electric circuit, the controller comprising a disc having a notch therein, a pin carried by the disc, :an apentured blocking member slideably positioned on the pin for axial movement with respect to the disc in one position to close the notch in the disc and in another position to open the notch in the disc, means forming a flared leading edge for the blocking member, and :a spring yieldingly urging the blocking member into notch closing position.

References Cited in the file of this patent UNITED STATES PATENTS 2,255,012 Lake et al. Sept. 2, 1941 2,553,846 Clemens May 22, 1951 2,595,588 Lee et a1. May 6, 1952

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