US1500325A - Self-winding gong - Google Patents

Description

w. H. KALLENBACH ET AL SELF WINDING GONG Filed Nov. 29. 1919 A Sheets-Sheet 1 w. H. KALLENBACH ET AL SELF WINDING G ONG Filed N V- 29. 1919 4 Sheets-Sheet 3 jrzveni'ors,

July 8, 1924.

W. H. KALLENBACH ET AL SELF WINDING GONG Hi.. f M k Filed Nov. 29, 1919 Patented July 8, 1924.

UNITED STATES PATENT om-Ce;

WALTER H. KALLENBACH AND CHARLES C BERTSGI-I, OF BOSTON, MASSACHUSETTS,

ASSIGNORS TO ALFRED A. ZEIGLER, OF ROXBURY, MASSACHUSETTS.

SELF-WINDING cone.

Application filed November 29, 1919. Serial No. 341,473.

To all whom it may concern) Be it known that we, WALTER H. KAL- LENBACH and CHARLES C. BERTSGH, citizens of the United States, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Self-lVinding Gongs, of which the following is a specification.

Our present invention relates to gongs, and more particularly to electric gongs of the type adapted for the sounding of firealarm or other signals. In gongs of this type a spring is ordinarily utilized for the actuation of the movable element or hammer :of the gong, which spring is normally restrained from operation but is adapted to be released to, cause the hammer to strike a single blow on the gong upon a change in the condition'of the current in the energizing coil of the controlling magnet, but .whichis adapted to repeatedly actuate the hammer when the abnormal condition persists in the energizing circuit. Bells or gongs of the type'above described generally have a spring of such strength that from 150 to 200 successive strokes of the bell may be sounded, after which it is necessary for the spring to be rewound in order that the bell may continue to function. This rewinding is usually manually performed, and as is the case with many apparatuses which depend for their proper and continuous successive operation upon some manual operation intermittently performed, often fail to operatebecauseof the neglect or forgetfulness of the attendant.

An object of our invention therefore, is the .provisionof means whereby a gong of the type above'described shall be self-winding,;'and the winding mechanism. shall op- .erate coincidently withthe operation of the gong striking mechanism .to ,rewind the spring or other member connected withxthe hammer of the gong and restore it toits original condition, thereby maintaining the gong always inconditionfor operation. 7

. \Vhile it is desirable in the majority of instances in whicha bell of .the typ'e described is employed to have the bell selfwinding, yet it frequently occurs that such a. feature is not necessary when the bell is first installed, but which may be necessary at some future time.

. Another objectjof our invention therefore,

istheprovision ofa gong adapted for selfwinding, but which may be utilized without the selfwinding features and function and operate as a straight single stroke bell of the type, above described.

A further objectvof our invention is an improved sel-f-winding. attachment for, gongs which is complete in itself andwhich maybe installed, in gongs having provision for manual rewinding, whereby such gongs may be converted into automatic rewinding gongs.

In the accompanying drawings'illustrating the preferred;embodiment of our invention, F ig. 1 is a plan'view of our improved gong 1 with thebell and cover plate re'mo'ved, the operating mechanism being shown in normal position. J

side elevation, taken w w .70 V Fig. 2 is a plan view similar to Fig- 1, but with portions of the mechanism and frame Fig. 5 is a view similar to Fig. 4;, but showv ing the position assumed by the operating mechanism after the signal has been sent and the armature of the signal magnet has returned to its initial position, a

Fig. 6 .isan enlarged plan view of certain of the elementsillustrated in Fig. 5,

'Fig. 7 is a. planv view of our improved gong, the bell and cover platejbeing in position I --'Fig.' 8 is bell only removed, 7 7

Fig. {9 is; 'an' enlarged plan view of the clutch wheel; ,7 g I Fig. :10 is asectional view on the line 10 10 0 Fi .-9, Fig. 1-1 is. a plan view, of the rewinding ag l t ri -12,15 an enlarge d detail view. show plan view of the gong, with the i ingqtheconstruction of therelease mechan ism operated by the signal imagnet armature, Y

supporting member,

Fig. 12 is aperspective detail of a latchk views of the circuit controlling springs for the rewinding magnet, in different operating positions, and

Fig. 17 is an enlarged detail View of the gong hammer and the mechanism associated therewith.

Fig. 18 is a vertical section taken through the rewind contact springs and star wheel and illustrating the relative positions thereof when the star wheel is free from bridging engagement with said springs.

Fig. 19 is a perspective detail of a cam for effecting the release of one of the clutch members.

Referring to the drawings, 10 designates a base, preferably circular in shape, provided with a centrally located perforation to receive the lower end of a rotatable shaft 11. Lugs or ears 12, symmetrically disposed about the periphery of the base 10, and perforated as shown, are provided for attaching the base and all parts carried thereby to a suitable support. A boss 13, provided with a plurality of perforations to receive the binding posts 14, is cast integral with the base 10. Posts 15, cast integral with the base, extend upwardly or outwardly therefrom, and are drilled and tapped, as shown in Figs; 1 and 2, to allow the frame in which the working mechanism is located, to be attached to thebase. A three-arm plate or yoke 16 of the frame is provided with a perforation in alignment with the centrally located perforation in the base 10 and acts as the top bearing for the shaft 11.

Mounted on the shaft 11 and attached thereto by the pin 17, is a clutch wheel 18 provided with an annular groove or slot 19 in its upper face. A clock spring 20 attached at its inner end to the hub of the clutch wheel 18 and at its outer end to one of the posts 15, provides the motive power for operating the devices to be hereinafter described.

Mounted for sliding movement in the an nular groove 19 is a clutch member 21, and, referring to Fig. 9 it will be noted that this clutch member 21 is cut away on opposite sides and ends at 22' and 23, leaving only the portions 24 and 25 to engage with the sides of the annular groove 19. With the clutch member 21 and clutch wheel 18 in the position shown in Fig. 9, it will be ap parent that the wheel 18 will be free to 'revolve in the direction of the arrow under the influence of the clock spring 20. If however, the clutch member be moved tangentially of the annular groove 19 downwardly, as viewed in Fig. 9, the portions 24 and 25 will be placed "in position to clutch the faces of the annular groove 19 and. will prevent further rotative movement of the wheel 18. A second clutch member 26 is also located in the annular groove 19 and, as illustrated in Fig. 9, is in the position last described for the clutch member 21. The function of this second clutch member will be hereinafter described A shaft 27, rotatably mounted in bearings in the base 10 and frame yoke 16, carries rigidly fastened thereto the gong hammer 28, the latch 29 and operating cam 30. A magnet 31 of the ordinary horseshoe type is mounted on the upwardly or outwardly extending plate 32, cast integral with the base 10. This magnet 31 is connected in a closed circuit through conductors 33' and 34 and a pair of the binding posts 14. The armature 35 of the magnet is mounted on a frame 36 pivoted on a shaft 37 mounted on the base 10 and an extension 38 of the frame yoke 16. A spring 36 attached to an extension of the frame 36 and to the base 10 moves the frame 36 and attached armature 35 away from the magnet 31 when the same is deenergized. On the end of the frame 36 remote from the pivot point 37 is pivotally mounted a link 39, the free end of which is pivotally connected to a latch-supporting member 40, (Figs. 12 and 12*), which is adapted to pivot about a pivot pin 40. Said member 40 is or may be formed with a recess in its upper face and a latch 41 is received therein and disposed to pivot about said pin 40 The shoulder 42 of said member 40 and said latch 41 may be counterbored to receive a compression spring 43, which spring is adapted to maintain the latch yieldingly in the position illustrated in Fig. 12, and a lateral projection as the pin 45 of said latch may engage the bottom. wall of a notch 45 in said member 40, whereby to limit the movement of said latch.

As clearly shown in Figs. 1, 2, and 12, the outer or free end of the latch 41 engages with the free end of the latch 29 holding the shaft 27 and associated parts in the nor- 1 mal or inoperative position. The end of the latch 29 is rounded at 44 in order to engage the underside of the latch'41 to lift said latch against the action of spring 43 when the latch 29 is returning to normal position,

as will be hereinafter more fully described. A lever 46, pivoted intermediate its ends at the point 47 on the frame yoke 16, carries at one end the weight 48 which, as the lever turns on its axis, engages with the frame 36 to return the parts associated therewith'to their normal position. At the other end. .ofthe lever 46 is'a cam face 49 which is engagement with said armature, or its frame,

whereby to permit said armature to drop when the electro-magnet is de-energ1zedand cause the ell-strikin mechanism to actuate.

Said lever 46 is adapted to be raised by the bell-striking mechanism to restore the armature to its normal attracted position,-thereby to effect single-stroke operation of the bellstriking mechanism; and hold said armature in such position until the electro-magnet is again' de-energized.

A member '50, rigidly attached to the frame yoke 16, has mounted thereon a pin 51 on which works a slot 52 at one end of the link 53, the other end of this lever being pivoted to an extension of the latch member 29, as clearly shown in Fig. 17. A lever 54 which is located beneath and extends in the same general direction as the link 53 is fastened at one end, by screws or in any other suitable manner, to the clutch member 26, and extending upwardly or outwardly from the lever 54 is a restoring pin 55 adapted to be engaged by the angular shaped end of the link 53. The upperface of the slotted end of the link 53 is a cam surface 56 which engages with a pin 57 at one end ofa lever 58 pivotally mounted on the lever 54. A pin 59 on the other end of the lever 58 engages with a locking spring 60, one end of which is fastened to a dependingstud 61- on the lever 54 while the other end carries a rotatable roll 62 for engagement with the periphery of the clutch wheel 18. ,Said spring 60, when in its normal position with the roll 62 engaging the periphery of the clutch wheel 18 serves to tilt the lever 54 and lock the wheel and therefore the shaft 11, against rotation through the clutch member 26..

Near the outer or free end of the lever. 54 is pivotally mounted a combined operating cam and locking latch 63, the-upper face 64 being a cam surface that-is engaged by the operating cam 30, while the lower hook portion 65 acts as a lock for an element of the mechanism to be hereinafter described. A spring 66 fastened. to the member 63 and to the lever 54 tends to return the member 63 to its normal position, as shown in Figs. 1 and 2-. A cam 67 is pivoted at 67 a to the extreme end of said lever 54 and may bear a roller 67 thereon which is adapted to be engaged by the operating cam 30 in'its-travel and depress the cam into engagement with a pin 68 on the end of a lever 69 pivotally mounteda-t 70 on the base 10,.and depress said lever. Suitable means described below,

may be employed to'raise said cam 67 and,

restore it to its original position. The other end ofthe lever 69 is cutaway as shown and engages with the lower end of a plate 71 fastened, by screws or inany other suitable manner, to the clutch member 21. The lower end of the plate 71 is slottedv at 72 and engages with. a pin 73 mounted on the base. This slotted arrangement ensures that the clutch member 21 is tan "ential to the annular groove 19 in the c utch wheel 18. A

spring 74 mounted on astud 75 on the base IOengageswitha pin,76 on thezplate'7l tending to .move the plate71 and-attached clutch member 21 intothe lower or. normal position. Said spring 74 also serves-to restore the cam; 67 to its normal position by depressingthe right-hand end (Fig.4) 10f lever 69-through the plate 71.

'.Mounted on. the base 10 is a-frame 77 on which is mounted the rewind magnet 7 8; Pivotallymounted on the frame 77 at one end of the magnet 78 is a frame 7 9 which eXtendspara-llel to 'and beneath the magnet andcarries at-itsfreeend the armature 80. It will be'noted, by reference to-Fig. 11 that the pole ends of the magnet 78. carry a-rec'-. tangular frame 81, and the armature 80,.is so' shap'ed: as to move-intosaid frame when the magnet. is'energizedwA spring 82 fastened to; a stud-83 on thebase 10 acts as a bufier for the frame 79, when the: magnetis deenergized and releases the armature 80, the upward movement of the'spring'82'being limited by the stop84. Formed integral with the frame 79 and extending rearwardly therefrom'is an arm 85 to whichis pivotally attached one endof a link 86,,the othereend of said linkbeing pivotally attached to the end of the lever 87, which in turn is pivotally mounted on the lever 54.- The lever 87 has formed thereon'a catch 88 which coacts with the latch 65 on the member 63 to hold the mechanism in its locked-orv normal position, as illustrated in'Figs. 1,2, and 5. A locking spring 89 attached: atone end to the frame 79, by riveting or. in any other suitable manner, carries at'its free end a "roller 90 which is adapted to bear againstthespring 91 attached to the binding post 92, the tensionofthe spring 91 being adjustable. by

means of the screw 93. A blockof-ins'ulatingmaterial 94 attached to theTbase 10 carries a terminal plate 95 to which is attached one end of a conductor 96. leadingHto-the energizing coil of the rewind "magnet 78. The tension of the springs 89 and 91 are so adjusted that thespring 89, when the magnet 78 is energized to attract its armature, forces the spring 91-to theleft, as viewed in Figs; 1,2, and5, breaking the circuit for the magnet 7,8at the roller 90 and terminal plate 95.

- Attachedtovthe'base- 1O is a er into allow the same to move into'engagement Y with the contact spring 101 to complete the circuit from one of the bindingposts: 14: to

conductor 104,- contact spring 101, contact spring 100, to the base 10, binding post 92, contact spring 91, roller 90, terminal plate 95, conductor 96, energizing coil of magnet 78, conductor 105, to binding post 14 and to battery. It will be noted, by reference to Figs. 14 and 15, that by reason-of its shape, cam 103 causes a quick make and a quick break of the contact springs 100 and 101. With the above construction, as the clutch wheel rotates, the energizing circuit for the rewind magnet is completed by the action of cam 103, and will remain completed as long as the cam acts on the spring 100. Should, however, the clutch wheel 18 rotate sufficiently to allow the cam 103 to pass beyond the end of contact spring 100, the circuit for the magnet 78 would be broken unlesssome means were provided to maintain it and said star wheel is provided for this purpose.

Said star wheel is normally free from electrical engagement with at least one of said contact springs, as 101, but when it is e11- gaged by pin 102 of the clutch wheel it is rotated to engage and make electrical contact with lateral extensions'lOO' and 101 of said contact springs 100 and 101 respectively and thereby complete the'rewind circuit and take the control thereof from the cam 103, the Hat portion 99 of said star wheel being moved to cause the engagement of the lateral extension 101 of saidlower contact spring 101 with said wheel; and for each rotation of the clutch wheel,'the star wheel will be advanced one tooth, and the rewind circuit will be complete and the rewinding continuous. At each reverse revolution of the clutch wheel the star wheel is moved backward one tooth and finally electrically disconnects the contact springs, the fiatportion 99 being moved opposite the lateral extension 101 for this purpose, and the final control of the rewind circuit is performed by the cam 103.

The outer peripheral edge of the base 10 is upturned at 106 and this upturned portion fits into the groove 106 on the interior of a substantially circular enclosing ring 107, a gasket 108 being placed in the groove 106 to exclude dust and moisture from the mechanism. The ring 107 extends upwardly or outwardly and its edge turned inwardly at 109 to receive a coverplate 110, the cover plate being attached to the edge 109 by screws 111.' The cover plate 110 is centrally perforated to receive a hollow standard 112, which rests on the frame yoke 16 and extends outwardly from the cover plate 110 a sufiicient distance so that the peripheral edge of the bell 113, which is mounted on the outerend thereof, is spaced apart from the cover plate. The under faced the central portion of the cover plate is recessed to receive a gasket 114 which is engaged by a circular projection 115 on the lower portion of the standard 112. The standard 112ishollow, as clearly shown in Fig. 3, and the outer portion thereof is enlarged and threaded at 116 to receive the hollow nut 117, by means. of which the bell113 is securely at-. tached to the standard 112. The outer end of the main shaft 11 is squared at 118 to allow the shaft to be rotated by a suitable wrench when it is desired to wind the spring 20 manually. A chamber or depression 119 is provided in the cover plate 110 to fit over the operating magnet 31 and the cover plate is also perforated to. allow the shaft 27.to project therethrough, the hammer 28 being located outside the cover plate and in operative relation to the bell 113.

The operation of the invention is as fol lows, it being. assumed that the mechanism above described is in its normal position, as shown in Fig. 1, with the operating spring 20 wound up. The circuit of the operating magnet 31 is broken and made by any suitable apparatus the required number of times to sound the desired code signal on the bell 113. As magnet 31 is in a closed circuit,:the first break thereof causes the deenergization of the magnet and the consequent release of the armature 35. Spring 36 retracts the armature 35 and the frame 36, through the link 39, swings the outer end of the latch 41 out of engagement with the latch 29 into the position shown in dotted lines in Fig. 4. Latch 29, operating cam 30 and hammer 28, being of considerable weight, swing downward from the position shown in Fig.1, to that shown in Fig. 4, the operating cam 30 in this movement first engaging cam face 49, second cam face-.64 and finally cam 67. The engagement of the operating cam 30 with the cam face 49 rotates the lever 46 about its pivot 47 and the weight 48 strikes the frame 36 restoring the latch 41 to its normal position. The engagement of the operating. cam 64 rotates the combined operating cam and locking latch 63, disengaging the lower hook portion from the latch 88 on the lever 87. The engagement of the operating cam 30 with the. cam 67 forces said cam against the pin 68 on the end of the lever 69. Lever '69 is rotated about the axis and the free end 73 forces the plate 71 upwardly, as viewed in Fig. 1. The clutch member 21 being attached to the plate 71 is moved upwardly tangential to the groove 19 against the-tension of spring 74 into the position shown in Fig. 9, where the faces 24 and 25 are out of engagement with the groove 19 and the clutch wheel 18 is free to rotate under the action of spring 20, in the direction ofthe arrow shown in Fig; 9. r

The latch 29, in'its downward movement, moves the lever 53 to the left, the slot 52 sliding on the pin 51 and the pin 57 on the end of the lever 58 is acted on by the cam 2 surface 56 sufficiently to cause the lever 58 to rotate when the pin 59, acting on the locking spring 61. moves the roller 62 away from the periphery of the clutch wheel 18. I

The mechanism being now in the position shown in Fig.- 4, andthe vclutch wheel 18 --i which wheel is actuated by its drivin spring 20, and carries the lever 54 and al mechanism attached thereto or contacting therewith, upwardly and into the position shown in Fig. 5. Operating cam moving upward, carries with it hammer 28 and latch 29. Hammer 28 moves into the position shown in dotted lines in Fig. 5, striking the bell 113 one blow; Latch 29 .moving upwardly the end 44 thereof engages with the lower face of latch 41, tilting the same about its pivot point against the tension of spring 43 and is brought to rest in the normal position, as clearly shown in Fig. 12. In the upward movement'of the latch 29, the lever 53 is moved to the right, when the free angular shaped end thereof engaging the restoring pin 55 on the lever 54 and moves the clutchmember 26 tangentially of the wheel 18 to free the working faces from the slot 19. .The cam 67 moves. away from the pin 68 and the spring 74, acting against the pin 76, moves the lever 69 and clutch member 21 back 'to their normal position. Also, the return movement of lever 54 allows the return of the roller v62, on the locking spring 61, against the clutch wheel18.

As so far described, the rewind mechanism has 'not'been brought into action, and will not be brought into action until enou h impulses of-current have been sent over. t e

energizing circuit for' the operatingmagnet 81 to allow the rotation of the clutch wheel a'wsuflici'ent angular distance to have'the cam 103 move the contacts pring 100 into engagement with the contact" spring 101.

When this occurs the energizing circuit. for.

the "rewind magnet is completed. as hereinbefore described, causing a 1 momentary energization of said magnet and the consequent attraction of thearmature 80.

Attraction of the armature 80 causes therocking of the frame 79 and the downward movement of the lever 85, link'86 and lever 87, as well as a movement to the left ofthe contact roller 90. The movement of the contact roller '90 breaks the energizing circuit for the rewind magnet at the terminal plate 95 and allows the spring 89 to force the frame 79 and mechanism operated thereby back to normal position, thelever 87in its return movement forcing the lever 54 and attached clutch member 26 tangentially ofthe groove 19 a suflicient distance to have the bearing faces of such clutchmember engage with the. sides of the groove 19 and rotate the" clutch wheel 18 in the direction oppositeto that indicated by the arrow in Fig. 1 to store up energy in the spring 20. Immediately the roller 90 reengages with the terminal plate the rewind movement just, described will berepeated and; will be :repeated indefinitely until the shaft 11 is rotated backwards far enough to release thespring from engagement with the spring 101. As the gong mechanism is capable of striking an indefinite number of blows, and as it is not practical to make the cam face of cam 103 indefinite in length, we have arranged the pin 102 on the clutch wheel 18 to engage with the star wheel 98 and rotate the same after a predetermined angular rotation of the clutch wheel to cause it to electrically engage the contact springs 101 and 102 and thereby control the rewind control regardless of the subsequent position of the cam The pin 102 will therefore control the 103. energizing circuit of the rewind magnet 7 8 until the spring 20 has been nearly rewound or until the pin 102 in its backward movement returns the star wheel 98 to its normal position. When this occurs the cam 103 again controls the energizing circuit until, when the spring '20 is fully rewound, the cam 103 allows the springs 100 and 101 to separate, thus permanently breaking the energizingcircuit. I

From, the above description, it is obvious that the gong striking mechanism may be used without reference to the rewind mechanism, the spring in this case being wound by hand. Also the rewind mechanism may be incorporated with the striking mechanism and the rewinding still; done byhand, or the striking mechanism and the rewind mechanism usedtogether, each being complementary of the other. When used in the manner last indicated it obviates thedanger anddelay incident to the use of a purely mechanical gong 1 and the apparatus will be found fully rewoundready for'use' as long as energyiis furnishedtoenergize the oper- V mounted in said groove and movable tangentially of said rotatablemember, a pivotally mounted latch, a hammer assosaid clutch member, a second clutch member mounted in said groove, a rewind mechanism, and means forconnecting said rewind mechamsm to said second clutch'memher to drive the rotatable member and store its energy in'the spring motor.

2.'In an electrically operated gong, the combination of a spring motor, a rotatable member operable thereby and provided with an annular groove, a clutch member mounted in said groove and movable tangentially of said rotatable member, a pivotally mounted latch, a hammer associated therewith, electrically operated means for releasing said latch and hammer, means associated with said latch and hammer for simultaneously operating the aforesaid clutch memberto allow the rotation of said rotatable member, means carried by said driving means to restqre the apparatus to normal and cause the hammer to strike the gong, a second clutch member mounted in said groove, arewind mechanism, and means for connecting said rewind mechanism to said second clutch member to drive the rotatable member and store its energy in the spring motor. 1

3. In an electrically operated gong, th combination of a spring motor, a rotatable member operable thereby and provided with an annular groove, a clutch member mounted in said groove and movable tangentially of said rotatable member, a pivotally mounted latch, a hammer associated therewith, electrically operated means for releasing said latch and hammer, means as sociated with said latch and hammer for operating the aforesaid clutch member to allow the rotation of said rotatable member, means carried by said driving means to restore the apparatus to normal and cause-the hammer to strike the gong, a pivoted lever operated by the means associated with said latch and hammer for restoring the electrically operated means to normal position, a second clutch member mounted in said groove, a rewind mechanism, and means for connecting said rewind mechanism to said second clutch member to drive the rotatable member and store its energy in the spring motor.

' 4:. In an electrically operated self-winding gong, the combination of a spring motor, a rotatable member actuated thereby and provided with an annular groove, a driving clutch and a holding clutch both mounted in said groove, a hammer, electrically-controlled means for connecting said hammer with said driving clutch and releasing said holding clutch, whereby to actuate said hammer, a rewind mechanism, and means for connecting said rewind mechanism with said driving clutch, whereby to rewind said spring motor.

5. In an electrically operated selfwinding gong, the combination: of a spring motor, a rotatable'member operable thereby, and-provided with an annular groove, a driving clutch and a holding clutch bothmounted in said groove, a hammer, electrically-controlled means for connecting said hammer With said driving clutch and releasing said hold- 7 rotatable member operated thereby, a gong.

striking mechanism, a driving means carried by the rotatable member for operating the gong striking mechanism, a rewind magnet, a circuit therefor, a pair of contacts in said circuit normally out of engagement with each other, a cam associated with said spring motor for moving said contacts into temporary electrical connection, and means governed by said rotatable member for .continuing the electrical connection between said contacts after release by said cam.

7. In a rewind mechanism for electrical self-winding gongs and thelike, thecombination'of a spring motor, a rotatable me1nber operated thereby, agong striking mechanism, a driving means carried by said rotatable member for operating said gong striking mechanism, a rewind magnet, rewind mechanism associated with saidmagnet. and rotatable member, and means to govern the operation of said rewind magnet including an operating circuit for said mag,

net, a break point in said circuit, means for closing said break point for a' predetermined length of time,and' other means including a cam operated by a star wheel for closing said break point.

8. In a self-winding gong, a free hammer,

a latch arranged to restrainthe hammer in raised position, electrically-controlled means to trip said latch and cause the hammerto drop, .a spring motor, a rotatable member driven thereby, a driving clutch arranged normally in engagement with Said rotatable .member, a holding clutch arranged normally in engagement with. said rotatable member to restrain it from rotation, .means actuated by the fallin hammer to release the holding clutch an .cause said driving clutch to raise said hammer forcibly, means actuated by the rising hammer to reset the driving clutch, a rewind magnet for said spring motor, an armature for said rewind names to this specification, in the presence magnet, means including a latch governed of two subscribing Witnesses. by said hammer for connecting said arma- WALTER H. KALLENBACH. ture with said driving clutch, and means CHARLES C. BERTSCH. 5 governed by said rotatable member for actu- Witnesses.

ating said rewind magnet. T. T. GREENWOOD,

In testimony whereof, We have signed our 7 H. B. DAVIS.

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