US2315583A - Reversing switch - Google Patents

Description

April 6, 1943. H. c. BLODGETT 2,315,583

REVERSING SWITCH Filed March 12, 1942 Patented Apr. 6, 1943 UNITED STATES i ATENT OFFICE REVERSING SWITCH Herbert Cady Blodgett, Hartford City, 1nd, assignor to Overhead Door Corporation, Hartford City, Ind., a corporation of Indiana Application March 12, 1942, Serial No. 434,494

' 14 Claims. (C1.175.3'75) This invention relates to improvements in reversing switches.

This is a continuation in part of my copending application, Serial No. 409,248, filed September 2, 1941, which, like the present case, relates to improvements in a reversing control embodying a switch similar to that shown in my still earlier filed application, Serial No. 359,050, filed. September 30, 1940.

The main objects of this invention are:

First, to provide a reversing switch which is well adapted for use in controlling a reversing motor actuating a vertically sliding door or equiv alent device, which control is adapted to be actuated by instantaneous manipulation of a push button or push buttons and incorporates novel provisions for overcoming an objection sometimes encountered in the manipulation of such a button or buttons.

Second, to provide a switch of the type described which is characterized by a slightly delayed action in the reversing operation.

Third, to provide a rotary motor actuated reversing switch in combination. with a simple, in stantaneously actuable push button control therefor, said switch having an operating connection to a reversing motor for reversing the same and being provided with means for insuring that only a single reversing cycle will take place for each manipulation of the push button, even if the same is held down rather than instantaneously actuated.

Fourth, to provide a switch of the type described which is comparatively simple and inexpensive in its parts and capable of being installed in any existing motor actuated door operating or like mechanism to control the reversing of the motor of the latter.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined in the claims.

Preferred embodiments of the invention are illustrated in the accompanying drawing, in which:

Fig. l is a plan View partially broken away illustrating the structure of the switch of my invention, the same being diagrammatically shown in operative connected relation to a mechanism for actuating and reversing the travel of a suitable instrumentality such as a vertically acting door.

Fig. 2 is an enlarged perspective view illustrating the structural relationship and manner of operation of certain of the parts of the switch to prevent repetition of its reversing cycle in the event the push button control is actuated continuously or is held down rather than instantaneously, the parts being illustrated in released push button postiion thereof.

Fig. 3 is a fragmentary detail view in plan illustrating the movable switch control elements in another operative position thereof, in which they come to rest when the push button is closed.

Fig. 4 is a fragmentary plan view illustrating a modified embodiment of the control contemplated by my invention, alternate positions of the parts, depending upon whether the push button is closed or open, being indicated in dotted and solid lines respectively.

Fig. 5 is a fragmentary perspective view illustrating a further modified embodiment of a control device contemplated by my invention, and

Fig. 6 is a fragmentary view in side elevation further illustrating structural details and the manner of operation of the embodiment of Fig. 5.

The present invention relates to improvements in a delayed action, motor actuated switch of the type illustrated and described in my above entitled copending applications, such switch being well adapted for use in the control of a reversing motor suitable for operating a vertically sliding door or similar instrumentality. In the aforesaid applications there is described a switch actuated by a small stalling motor or through a suitable yieldable clutch, the rotation of which is governed by an electromagnetically controlled detent, whereby when the electromagnet is energized the switch is released for predetermined rotation by its driving motor to thereby reverse a main motor circuit. The electromagnetic .circult is preferably controlled by a simple inexpensive push button which is intended to be instantaneously actuated, then released. "Instantaneously is used in the sense of pushing and releasing with reasonable promptness as distinguished from holding. There is of course commonly a varying time factor in the switch operation. However, it has been found that in some cases persons are apt to hold the push button depressed, in which case the switch motor drives the same for a longer period than the intended increment of rotation for a single reversal, with the result that the reversing cycles are repeated as long as the switch motor circuit and electrornagnet circuit remain closed.

It is therefore the purpose of the present invention to improve on the switch described in the preceding paragraph, by the provision of a simple latching or detent device capable of unfailingly terminating the rotation of the switch after a single reversing cycle and of preventing further rotation, such as would again reverse the cycle, until the manually controlled push button is actuated a second time, notwithstanding the fact that said push button is maintained closed, either accidentally or by design.

In the drawing the reference numeral designates a suitable base on which the operating instrumentalities of the switch are mounted in a manner to be described. The reference numeral 2 designates an enclosed casing having the push button switch 3 of a simple inexpensive and entirely conventional spring urged type thereon. Actuation of this switch, instantaneous or otherwise, serves to complete a circuit through the leads 4, 5, and it will be understood that the push button is normally spring urged to break this circuit. I have not illustrated details of the push button per se inasmuch as it may be of a readily available type on the market. The wires 4, 5 are led from their connection to the push button switch upwardly and rearwardly of the base or support and brought through holes 6 therein and attached to the binding posts I, 8 respectively. These binding posts are connected to feed and return line leads 9, l9, respectively, of a suitable voltage source, for example, a 110 volt domestic circuit. The base or support I has mounted on the rear thereof a small motor H which may be of an inexpensive stalling type, this motor being illustrated in dotted lines in Fig. 1, since per se it forms no part of the invention, being preferably of a type which is available at low cost on the market.

The shaft of this motor is connected to a coaxial spindle |2 appropriately journaled on the base, which spindle is provided with an elongated tappet rod I3 fixedly disposed in a transverse opening in the spindle and extending radially on either side thereof. The spindle likewise has secured thereon a cam or eccentric l4 of insulating material which is adapted to alternately engage and deflect the spring contact current conducting blades l5, IS on either side thereof. These contact blades are integrally connected as parts of a U-shaped conducting member of spring metal which is secured to an insulated block l3 pivotally mounted on base or support I. The conducting member is electrically connected to the binding post by means of an insulated wire I9.

The resilient blades |5, |6 are provided at their free ends with contacts 20, 2|, respectively, adapted for respective engagement with contacts 22, 23 on the spring conducting arms 24 at either side thereof. Said arms 24 are carried in insulating blocks 25, 26 mounted on the base. The position of the arms 24 is adjustable by set screws 21 threaded in said blocks. Accordingly it will be appreciated that as spindle |2 undergoes 180 increments of rotation under the influence of the motor H and the detent control to be hereinafter described, the contacts 20, 2| alternately engage and complete electric circuits through the contacts 2'2, 23. The resilient contact arms 24 are connected by insulated leads 28, 29 to binding posts 30, 3|, respectively, on base In the illustrated embodiment in an actuating mechanism for a vertically sliding door the binding posts 39, 3| are connected respectively by leads 32, 33 through limit switches 34, 35 with the reversing terminals of the main actuating motor 36 for the controlled mechanism, which motor is employed to drive an elongated screw 31 connected to the motor shaft by a friction clutch. This screw has a nut-like traveler 33 threaded thereon ongageable with the limit switches to break the motor circuit at the limits of travel thereof. It will be understood that member 38, or an equivalent motor driven member is appropriately connected to the door or other instrumentality to actuate the same for its travel in opposite directions. The center terminal of the reversing motor 36 is connected by a lead 39 with the return line ll) of the main voltage source.

In order to control the rotation of the spindle l2, hence the making and breaking of circuits between contacts 29, 22 and 2|, 23, I provide a detent 43 terminating in a downturned finger 4| adapted to be projected downwardly into the rotative path of the tappet rod l3 in the manner illustrated in Fig. 2, the arrow adjacent finger 4| indicating the direction of travel of that finger toward operative position to engage said tappet rod.

Detent 4B is mounted on an armature 42 of an electromagnet generally designated 43, said armature being suitably pivoted at 44 above the coil 45 of the electromagnet. The armature 42 is normally urged upwardly to an inoperative position of the detent finger 4|, i. e., to the position illustrated in Fig. 2, by means of a suitable coil spring connected to the rear of the armature at 43. The manner in which the armature is drawn downwardly to operative position will be hereinafter described.

Coacting with detent 45 in regulating or controlling the stopping of the tappet rod l3 after a 180 increment of rotation, I provide a latch dog 41 which is actuable in a plane at right angles to the plane of actuation of detent 40 by its connection to the armature 48 of a second electromagnet 49 disposed at right angles to the electromagnet 43. These electromagnets are appropriately mounted on a bracket 50 on base I, the armature 48 being pivoted on this bracket at 5|.

Armature 48 is normally urged by a coil spring 52 in a direction to position the latch dog 41 in the path of rotation of tappet rod l3, i. e., in the position illustrated in Fig. 2, and is withdrawn therefrom in the direction of the arrow in said figure when the electromagnet 49 is energized. A suitable stop or abutment 53 adjustably mounted on contact carrying block 25 limits the downward movement of the latch dog 41 under the influence of spring 52.

From the foregoing it will be appreciated that when electromagnet 43 is energized detent 4|] is actuated downwardly into position for engagement by or to constitute a stop for tappet rod l3 and that electromagnet 49 when energized withdraws latch dog 4'! from actuated tappet engaging position. The electromagnets are simultaneously energized when push button 3 is actuated to complete a circuit through wires 4, 5.

Th wiring for these electromagnets includes insulated leads 54, 55 connected to one end of the respective electromagnet coils and return leads 55, 51 connected to the other end of the respective coils. Leads 54, 55 are in parallel, being connected to a binding post 58 while leads 56, 51 are also in parallel and connected to binding post 8. Binding post 58 is connected to the main circuit return line H] and is also in the circuit for the continually energized motor l, which circuit includes the insulated leads or wires 59, 60 for motor connected respectively to the binding post 8 and to binding post 58.

It is believed that a brief explanation will clarify the electrical hook-up described above. The cam and tappet rod actuating motor I l is continuously energized, though normally held in a stalling position, through feed line 9, binding post I, insulated wires 59, 6 binding post 58 and return line Hi. When push button 3 is actuated an energizing circuit for the electromagnets is completed as follows: feed line 9, binding post i, insulated wire 4, the push button switch 3, insulated wire 5, binding post 8, electromagnet leads 54, 55, the electromagnets 49, 43, the electromagnet return leads 56, 5?, binding post 58, and main return line I 0. The circuit for the controlled reversing motor 36 is as follows: feed line 9, binding post I, insulated wire l9, conducting member II, contact 25 (or 2!), contact 22 (or 22), connector wire 28 (or 29) binding post 30 (or 3 i lead 32 (or 33), limit switch 34 (or 35) motor 36, lead 39 and main return line I ii.

In normal condition, as explained above, the switch motor H i held in a stalling condition. This is caused by the latching engagement of dog 4'! with tappet rod I3, in the manner illustrated in Figs. 1 and 2. In this position contacts 22, 23 are in engagement so that the energizing of motor 35 continues until its circuit is broken at limit switch 34. When it is desired to reverse the rotation of motor 36, push button 3 is intended to be instantaneously energized to withdraw latch dog 41 laterally out of the path of the tappet rod, whereupon motor H rotates the spindle I2. In the event instantaneous actuation of the push button switch has been made the latch dog will. when the push button is released, again be urged into operative position by spring 52 to engage the tappet rod following the 13d rotation thereof, detent 49 being in such circumstances maintained in elevated inoperative position by spring 45. However, in the event that the push button is held down so that magnets 43, 49 continue to be energized then detent 49 is held downwardly in the path of the tappet rod 53 in the manner illustrated in Fig. 3, thereby halting further rotation thereof. Just as soon as the pressure on the push button is released to break the electromagnet circuit. detent M) is withdrawn upwardly to inoperative position and latch dog 4'! simultaneously swung to its operative position of Figs. 1 and 2. preventing repetition of the cycle until the push button is again actuated. This constitutes an extremely effective method of preventing undesired repetition of the reversing cycle due to inadvertent improper actuation of the push button control.

In Fig. 4 I illustrate a modified embodiment of the invention utilizing an escapement device generally indictaed by reference numeral 6 I. In this embodiment the latch dog 41!, when withdrawn upwardly to dotted line position by the electromagnet 49! engages a down-turned tooth or prong 62 of the escapement member which is pivoted at 63, thereby swinging the member to position the oppositely down-turned curved tooth or prong 54 thereof into position to engage and halt tappet rod l3i. The escapement member is normally urged in clockwise direction by a coil spring 65 whereby tooth maintains dog MI in obstruoting relation to the rod, and from the description of the embodiment of Figs. 1-3 it is believed that a clear understanding of the operation of this alternative form will be had. It dispenses with the use of one of the electromagnets. However, in practice I have not found it to b quite so reliable in operation as the dual magnet structure of the preferred embodiment.

In Figs. 5 and 6 I illustrate a still further modified embodiment of control device which may be used in substitution for the detent-latch dog arrangement of Figs. 1 and 2 or the escapement device ef Fig. 4. In these figures the rotatable tappet rod is designated I32 and the armature of an electromagnet is designated 42l, it being understood that the electromagnet is energized in the manner described above. The armature has mounted thereon a laterally extending arm 66 which is normally spring urged upwardly, its upward movement being limited by a fixed stop 61. The arm has two laterally spaced fingers 68, 69 offset downwardly therefrom, the former of which is offset laterally and upwardly at its lower end to provide a lug 1'0 in alinement with the finger 69. As clearly illustrated in Fig. 5, the fingers 63, 69 are spaced laterally from one another in the direction of rotation of the tappet rod, being of the nature of forked extremities of arm 66. With arm 65 spring urged upwardly lug 10 is positioned for obstructing engagement with tappet rod i 32, this position being illustrated in solid lines in Fig. 6. However, when the arm is electromagnetically drawn downwardly to dotted line position of Fig. 6, the said lug is retracted beneath the tappet rod and the latter permitted to rotate. Should the push button be held down a sufficient length of time for the rod to complete a half rotation, the latter would strike finger E9, otherwise its movement will be obstructed by lug 10. In other respects the control is entirely similar to the system illustrated in Figs. 1 and 3, the armature 42l being considered as an equivalent of the armature 42 and similarly controlled. The main difference is that the functions of the two electromagnets of the embodimerit of Figs. 1, 2 and 3 are incorporated in a single electromagnet, thereby simplifying the construction.

In the embodiments described above the present switch structure is particularly well adapted for the control of a single phase, compensator type motor in which positive braking action exists to slow the motor down to a reversing speed. Motors of this type require a delay of about onehalf second from the time the running current to the directional coil is cut oil? until it is again turned on, and the present switch provides this necessary, positive and predetermined time delay. It is thereby made possible to employ to compare.- tively inexpensive single phase motor to actuate the door instead of a three phase motor, a decided advantage, because the latter is costly and, moreover, three phase current'is not as a rule available in the home garage. A great saving is likewise effected as compared to systems employing the usual cross line switch. There are fewer parts, there is far less internal wiring, and greater compactness, in addition to the fact that the time delay feature is lacking in the regular cross line switch.

Embodiments of the invention which incorporate the principles of the invention in a highly desirable manner have been illustrated and described, though I am aware that other embodiments within the intent of the invention will suggest themselves to those skilled in the art. It should be understood that the foregoing terminology is used only descriptively rather than in a limiting sense, and with full intention to include equivalents of the features shown and described, with-in the scope of the following claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A rotary, motor driven, delayed action reversing switch, comprising a continually electrically energized conducting switch member alternately engageable with a pair of reversing contacts, a rotatable cam engageable with said memher to effect said alternate electrical engagement in alternate cycles of rotation of the cam, a continuously electrically energized stalling motor having its shaft drivingly connected to said cam to rotate the same, a tappet member operatively connected to the motor shaft for rotation with said cam, and means coacting with said tappet member to regulate the rotation of the cam and tappet member in predetermined cycles of a predetermined angular increment and to prevent inadvertent repetition of said cycles, comprising a detent member and a latch member simultaneously movable respectively into and out of the path of movement of the tappet member for obstructing engagement and disengagement there with, and an electromagnet for each of said detent and latch members having an armature operatively connected thereto to simultaneously shift the same, said armatures having spring means coacting therewith to shift the same in the opposite direction to the direction of movement thereof when electromagnetically actuated, said electromagnets and spring means coacting when the electromagnets are energized to project one of said last named members into operative position in the path of said tappet member and withdraw the other, and vice versa. the electromagnet energizing circuit including a spring urged push button control switch, and said alternate tappet member obstructing and freeing movements of said members preventing repetition of the rotative increment of said tappet member in the event said last named switch is held closed.

2. A rotary, motor driven, delayed action reversing switch, comprising a continually electrically energized conducting switch member alternately engageable with a pair of reversing contacts, a rotatable cam engageable with said member to effect said alternate electrical engagement in alternate cycles of rotation of the cam, a continuously electrically energized stalling motor having its shaft drivingly connected to said cam to rotate the same, a tappet member operatively connected to the motor shaft for rotation with said cam, and means coacting with said tappet member to regulate the rotation of the cam and tappet member in predetermined cycles of a predetermined angular increment and to prevent inadvertent repetition of said cycles, comprising a detent member and a latch member simultaneously movable respectively into and out of the path of movement of the tappet member for obstructing engagement and disengagement therewith, and electromagnetic means having armature means operatively connected to said members to simultaneously shift the same, and spring means coacting with said electromagnetic means to shift the detent and latch members in the opposite direction to the direction of movement thereof when electromagnetically actuated, said electromagnetic and spring means coacting when the former is energized to project one of said last named members into operative position in the path of said tappet member and withdraw the other, and vice versa, the electromagnet energizing circuit including a spring urged push button control switch, and said alternate tappet member obstructing and freeing movements of said members preventing repetition of the rotative increment of said tappet member in the event said last named switch is held closed.

3. A rotary, motor driven, delayed action reversing switch, comprising alternately engageable reversing contact means, a rotatable cam ongageable with said means to effect said alternate electrical engagement in alternate cycles of rotation of the cam, continuously electrically energized means drivingly connected to said cam to rotate the same, a tappet member rotatable with said cam, and means coacting with said tappet member to regulate the rotation of the cam and tappet member in predetermined cycles of predetermined angular increment and to prevent inadvertent repetition of said cycles, comprising a detent member and a latch member simultaneously movable respectively into and out of the path of movement of the tappet member for obstructing engagement and disengagement therewith, electromagnetic means having armature means operatively connected to said members to simultaneously shift the same, and springs means coacting with said electromagnetic means to shift the detent and latch members in the opposite direction to the direction of movement thereof when electromagnetically actuated, said electromagnetic and spring means coacting when the former is energized to project one of said last named members into operative position in the path of said tappet member and withdraw the other, and vice versa, the electromagnet energizing circuit including a spring urged push button control switch, and said alternate tappet member obstructing and freeing movements of said members preventing repetition of the rotative increment of said tappet member in the event said last named switch is held closed.

4. A rotary, motor driven, delayed action reversing switch, comprising coacting alternately engageable electrical reversing switch contacts, a rotatable cam operatively connected to said contacts to effect said alternate electrical engagement, a continuously energized motor drivingly connected to said cam to rotate the same, a rotatable control element operatively connected to and driven in synchronism with said last named means, and means engageable with said control element to regulate the rotation thereof in predetermined increments and thereby control the cycles of said alternate contact engagement, comprising a detent member and a latch member simultaneously movable respectively into and out of operative obstructing and halting position in the path of movement of the element, an electromagnet for each of said members having an armature controlled thereby operatively connected to the respective members to shift the same in a predetermined direction, and spring means coacting with said members to shift the same in the opposite direction to the direction of movement when electromagnetically actuated, said electromagnets and spring means coacting when the electromagnets are energized to project one of said members into operative position in the path of said control element and withdraw the other and vice versa, the electromagnet energizing circuit including a spring urged push button control switch, and said alternate movement of said latch and detent members preventing repetition of the rotative increment of said control element in the event said last switch is held closed.

5. A rotary motor driven delayed action reversing switch, comprising coacting alternately engageable electrical reversing switch contacts, means operatively connected to said contacts to effect said alternate electrical engagement, a continuously energized motor drivingly connected to said last named means to actuate the same, a rotatable control element operatively connected to and driven in synchronism with said last named means, and means engageable with said control element to regulate the rotation thereof in predetermined increments and thereby control the cycles of said alternate contact engagement, comprising a detent member and a latch member simultaneously movable respectively into and out of operative obstructing and halting position in the path of movement of the element, an electromagnet for each of said members having an armature controlled thereby and operatively connected to the respective members to shift the same in predetermined direction, and spring means coacting with said members to shift the same in the opposite direction to the direction of movement when electromagnetically actuated, said electromagnets and spring means coacting when the electromagnets are energized to project one of said members into operative position in the path of said control element and withdraw the other and vice versa, the electromagnet energizing circuit including a spring urged push button control switch, and said alternate movement of said latch and detent members preventing repetition of the rotative increment of said control element in the event said last named switch is held closed.

6. A rotary motor driven delayed action reversing switch, comprising coacting alternately engageable electrical reversing switch contacts, means operatively connected to said contacts to effect said alternate electrical engagement, a continuously energized motor drivingly connected to said last named means to actuate the same, a rotatable control element operatively connected to and driven in synchronism with said named means, and means engageable with said last control element to regulate the rotation thereof in predetermined increments and therebi control the cycles of said alternate contact engagement, comprising a detent member and a latch member simultaneously movable respectively into and out of operative obstructing and halting position in the path of movement of the element, electromagnetic means operatively connected to the respective members to shift the same in a predetermined direction, and Spring means coacting with said members to shift the same in the opposite direction to the direction of movement when electromagnetically actuated, said electromagnetic and spring means coacting when the former is energized to project one of said members into operative position in the path of said control element and withdraw the other and vice versa, the electromagnet energiZing circuit including a spring urged push button control switch, and said alternate movement of said latch and detent members preventing repetition of the rotative increment of said control element in the event said last named switch is held closed.

7. In a rotary motor driven current reversing switch, in combination with opposed alternately closed and open reversing contacts, an electrically energized conducting member interposed therebetween and operatively engageable alternately therewith to close and open the same, rotatable means for effecting said alternate engagement including a continuously energized stalling motor having a cam drivingly connected to the shaft thereof and effective to actuate the conducting member for said alternate engagement, rotation controlling means for timing and regulating the rotation of said cam in predetermined increments, comprising a rotatable control element fixedly connected to said rotatable means for rotation therewith, and electrically controlled means engageable with said element to halt the rotation of the same and said first named rotatable means, a manually actuable, spring urged push button switch and electrical connections controlled thereby, said electrically controlled means comprising a pair of movable members positioned in succession with reference to the path of rotation of said element, said members being connected to one another for movement as a unit and being simultaneously movable respectively to operative element halting and inoperative element releasing positions, and vice versa, with reference to said path, whereby when one member is in operative position the other member is out and vice versa, electrically energizable means connected to and electrically controlled by said push button switch connections, and means for actuating said last named members including means controlled by said electrically energizabl'e means to shift said members alternately into and out of operative position, whereby one of said members engages and obstructs movement of the control element when the push button switch is closed and the other thereof engages and obstructs movement of the element when the push button switch is open.

8. In a rotary motor driven current reversing switch, in combination with opposed alternately closed and open reversing contacts, an electrically energized conducting member interposed therebetween and operatively engageable alternately therewith to close and open the same, rotatable means for effecting said alternate engagement including a continuously energized stalling motor having a cam drivingly connected to the shaft thereof and effective to actuate the conducting member for said alternate engagement, rotation controlling means for timing and regulating the rotation of said cam in predetermined increments, comprising a rotatable control element fixedly connected to said rotatable means for rotation therewith, and electrically controlled means engageable with said element to halt the rotation of the same and said first named rotatable means, a manually actuable, spring urged push button switch and electrical connections controlled thereby, said electrically controlled means comprising a pair of movable members positioned in succession with reference to the path of rotation of said element and simultaneously movable respectively to operative element halting and inoperative element releasing positions, and vice versa, with reference to said path, whereby when one member is in operative position the other member is out and viceversa, and electromagnetic means connected and electrically controlled by said push button switch connections, said electromagnetic means being operatively connected with said members and having means coacting therewith to shift said members alternately into and out of operative position, whereby one of said members engages and obstructs movement of the control element when the push button switch is closed and the other thereof engages and obstructs movement of the element when the push button switch is open.

9. In a rotary motor driven current reversing switch, in combination with opposed alternately closed and open reversing contacts, an electrically energized conducting member interposed therebetween and operatively engageable alternately therewith to close and open the same, rotatable means for effecting said alternate engagement, means for timing and regulating said alternate engagement, comprising a rotatable control element fixedly connected to said rotatable means for rotation therewith, and electrically controlled means engageable with said element to halt the rotation of the same and said first named rotatable means, a manually actuable, spring urged push button switch and electrical connections controlled thereby, said electrically controlled means comprising a pair of movable members positioned in succession with reference to the path of rotation of said element and simultaneously movable respectively to operative element halting and inoperative element releasing positions, and vice versa, with reference to said path, whereby when one member is in operative position the other member is out and vice versa, and a pair of eletromagnets connected and electrically controlled by said push button switch connections, said electromagnets having armatures connected with said respective members and being provided with springs acting on the armatures to shift said members alternately into and out of operative position, whereby one of said members engages and obstructs movement of the control element when the push button switch is closed and the other thereof engages and obstructs movement of the element when the push button switch is open.

10. In a rotary motor driven current reversing switch, in combination with opposed alternately closed and open reversing contacts, an electrically energized conducting member interposed therebetween and operatively engageable alternately therewith to close and open the same, rotatable means for effecting said atlernate engagement, means for timing and regulating said alternate engagement, comprising a rotatable control element fixedly connected to said rotatable means for rotation therewith, and electrically controlled means engageable with said element to halt the rotation of the same and said first named rotatable means, a manually actuable, spring urged push button switch and electrical connections thereby, said electrically controlled means comprising a pair of movable members positioned in succession with reference to the path of rotation of said element and simultaneously movable respectively to operative element halting and inoperative element releasing positions, and vice versa, with reference to said path, whereby when one member is in operative position the other member is out, and vice versa, and electromagnetic means connected and electrically controlled by said push button switch connections, said electromagnetic means being operatively connected with said members and having means coacting therewith to shift the said members alternately into and out of operative position, whereby one of said members engages and obstructs movement of the control element when the push button switch is closed and the other thereof engages and obstructs movement of the element when the push button switch is open.

11. In a rotary motor driven current reversing switch, in combination with opposed alternately engageable reversing contacts, rotatable means for effecting said alternate engagement, means for timing and regulating said alternate engagement, comprising a rotatable control element fixedly connected to said rotatable means for rotation therewith, and electrically controlled means engageable with said element to halt the rotation of the same and said first named rotatable means, a manually actuable, spring urged push button switch and electrical connections controlled thereby, said electrically controlled means comprising a pair of movable members positioned in succession with reference to the path of rotation of said element and simultaneously movable respectively to operative element halting and inoperative element releasing positions, and vice versa, with reference to said path, whereby when one member is in operative position the other member is out and vice versa, and electromagnetic means connected and electrically controlled by said push button switch connections, said electromagnetic means being operatively connected with said members and having means coacting therewith to shift said members alternately into and out of operative position, whereby one of said members engages and obstructs movement of the control element when the push button switch is closed and the other thereof engages and obstructs movement of the element when the push button switch is open.

12. In combination with a rotary reversing switch including conducting means and coacting reversing contacts with which the same alternately has electrical engagement, a rotatable member regulating the making of said electrical engagements, means for actuating said member comprising a continually energized motor operatively connected to said member to drive the same when permitted, a rotary control element connected to and driven by the motor in syn chronism with the said member, an element controlling device including a pair of control members positioned and mounted I01 successive simultaneous movement into and out of the path of said element to respectively halt and permit rotation of the element and rotatable member, electromagnetic means provided with an armature coacting with said device to shift one of said control members out of element obstructing position, means simultaneously acting on the other control member to shift the same into element obstructing position, and a push button switch electrically connected to said electromagnet means to control the energization thereof, said alternately acting members preventing repetition of the reversing cycle of the rotatable member in the event said push button switch is held in circuit closing position.

13. In combination with a rotary reversing switch including a plurality of contacts suc cessively engageable to complete electrical circuits and a rotatable member regulating the making of said engagements means for actuating said member, comprising a continually energized motor operatively connected to said member to drive the same, a rotary control element drivingly connected to said member, said element being operatively connected to and driven by said motor in synchronism with said member, a rotation controlling device for said control element, comprising a pair of control members spaced lat- 'member, a rotary control element drivingly conerally in the direction of rotation of the element and mounted for simultaneous movement respectively into and out of the path of said control element to respectively halt and permit rotation of the element, and consequently of said first named rotatable member, electrically energizable means operatively connected with said device to simultaneously shift one of said control members out of element obstructing position and the other control member into element obstructing position, and push button means electrically connected to said last named means to control the energization thereof, said element obstructing control members preventing repetition of the reversing cycle-of said first named rotatable member in the event said push button switch is continuously held in position energizing said last named means.

14. In combination With a rotary reversing switch including a plurality of contacts successively engageable to complete electrical circuits and a rotatable member regulating the making of said engagements, means for rotating said nected to said member, a rotation controlling device for said control element, comprising a pair of control members spaced laterally in the direction of rotation of the element and mounted for simultaneous movement respectively into and out of the path of said control element to respectively halt and permit rotation of the element, and consequently of said first named rotatable member, electrically energizable means operatively connected with said device to simultaneously shift one of said control members out of element obstructing position and the other control member into element obstructing position, and push button means electrically connected to said last named means to control the energization thereof, said element obstructing control members preventing repetition of the reversing cycle of said first named rotatabe member in the event said push button switch is continuously held in position energizing said last named means.

HERBERT CADY BLODGETT.

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