US1477295A - Automatic stopping mechanism - Google Patents

Description

Dec. 11,1923. 1

L. Y. SQUIBB AUTOMATIC- STOPPIYNG MECHANISM Original Filed Aug. a,-1e14 ji INMENTR flgw/Zb,

WITNESSES ATTORNEIY I,

20 r after the machine has been in operation for a predetermined period slightly greater than I Patented Dec. in, 192s.

mm "s- 'rEs Y IC morn Y. SQUIlBB, or mm, NEW ,nmsnr, assxen'oa T0 vrc'roa TALKING Macnmn comran'r, A CORPORATIQN or new quasar.

aurom'rm srorrme mncna'nrsml Application filed August a, 1914, Serial m.,a55,7ea. Renewed ma 1, 192a;

To all whom it may concern:

Be it known that- I, LLOYD Y. citizen of the United States, and

SQUIBB, a

. of the city of Camden, county of Camden,

State of New Jersey, have invented oertaln new and useful Improvements in Automatic Stopping'Me'chanism, of which the following is a specification; 1;

4 One object" of this invention is to provide in combination with-stoppin mechanism ineluding anelement-movable rom anon-stop into a sto ping position and retaining 1 1 1 2515 for holdi ig the element in a non-stopping position, improved releasing ,means for actuating the retaining means to release the element from a' non-stopping positions:

A further object of this invention isfto provide improved means for automatically effecting the release of an automatic switch of an electrically actuated talking machine,

that necessary for reproducin the sounds from the largest record capable of being operated by the talking machine, case the switch should not be released immediately after the reproduction ofsounds from the record, the automatic releasing or release. the switch' shortly i afterwards to avoid a waste of current.

Other objects of this invention will appear hereinafter.

In the accompanying drawings Fig. 1 is a top plan view of an improved timing mechanism constructed. in accordance with this invention and applied in combination with an automaticswitch adapted for useupon a talking machine or other device; gig. 2 is a section of the same-on line 2-2 of 1 Referring to the drawings, one embodiment of thisinvention is shown as applied .to a talking machine including a vertical turntable spindle 5, arranged to be rotated about a fixed axis coincident tudinal axis by any suitable electrical motor (not shown) and adapted to su port and to rotate a turntable for carrying t usual disc a resident lower portion of the 'casing.l5 which is so that in insulated from the switch with its longi-- sound recordin combination with an automatic switch comprising a substantially flat stopping vmember 11, 1

loosely through the switch lever' l1- and tightly through the base-plm 6. Foremanually resetting the. switch lever, the switch 'lever is provided at its. outer end with a handle 13.- Arranged'below thebase: plate 6 and coaxial with and surrounding the pivot 12'is a cylindrical the under surface' screws 16; i

Arranged within the casing -15 are two stationary terminals-17 and 18, which are rigidly clamped against of the base plate 6 by adapted to be electrically connected respectively to suitable wires or electrical con-f ductors 19 and 20 forming part of the circuit of the electric motor casing 15 and loosely surrounding the pivot 12f-and insulated therefrom, 'is' a rotary (not shown) which actuates the turntable spindle. Within the laminated switch member 21 arranged to cooperate with the stationary term nals 17 and r 18 to open or close the motor circuit, the

switch member 21 being arran ed to be oscillated in response to the oscillation of the switch lever 11 by means of a collar 22 surrounding the pivot 12 and secured to but I member 21, and

provided with a lug .23 ro ecting upwardly therefrom and the jects loosely through an arcuate slot 24 provided therefor in the base plate 6 and engages loosely in an aperture 24' provided upper end of whichpro therefor in the switch lever 11. 'The aperture 24',is elongated to permit of a limited amount of rotatio of the 'switch lever 11 independently of t e lug 23, so that when the switch lever ,is rotated anti-clockwise from an on position'towards'a-n ofl position, it wi'llrotate through a short are independently of the lug 23 and Will-then normally effective to or by both to stopping when the tone arm reaches a predeter-- The releasing 7 ing switch stop member 11 is wardly from the tone arm ment between the switch lever 11 and the.

lug 23, less force is required to beapplied through thespring 29 and a lighter and more easily elongated spring 29 maybe used than would otherwise be required.

For automatically actuating the switch lever 11 to break the motor circuit in responseto a predetermined movement of the swingin tone arm (not shown) of the talk mac ine, 25 is arranged above swing in a plane parallel thereto about a vertical pivot 26 extending through one end of the latch and fixedly secured in an extension of the base plate 6.' The latch 25 is provided at its free end with a tooth 27 arranged to engage snugly in a'correspondmg notch 28in the switch lever 11 to hold the switch lever or stopping member in a nod stopping or closed position. A spiral spring 29 is secured at one end to the lever 11 and at itsother end to the latch 25, and is normally held in an extend ed condition tending to rotate the switch lever 11 in an anticlockwise direction to open the motor circuit. The spring 29 also tends to rotate the latch 25 in a clockwise direction when the tooth 21 is in engagement with the notch 28; and the spring is hold the-tooth 27 in engagement in the notch 28 when the switch lever 11 is in a non-stopping or on p0Sition as shown in Fig. 1. The outer side ed e 27 of the tooth'27 is slightly beveled and the corresponding wall of the notch 28 is correspondingly beveled so that when the forced either manually or automatically in an anti-clockwise direc tion the tooth 27 of the retaining member 25 will be forced out of-the notch 28, and out of engagement with the abutment formed by the coacting wall of the notch 28, and the stop member 11 will be free to be moved by the handle 13 or by the spring 29 osition. For automatica ly re easing the switch 11, a releasin arm 30 is arranged to swing coaxially with the latch 25 in a fixed path about the pivot 26, and cooperates in a wellkn'own manner with the latch25 and with a stud 31 carried by and projecting down- (not shown) to swing the latch 25 in an anti-clockwise direction to release the switch lever 11 and to permit the switch lever 11 to be swung in an anticlockwise direction by the spring 29 mined point in its travel. arm 30 is rotatably adjustable with respect a latch or retaining member,

the base plate 6 to to the latch 25 to be engaged by the stud .31 to effect the release of the switch lever 11 at any desired point of movement of the tone arm, and is preferably adjusted in any particular case to 'efiect the release of the switch lever 11 immediately after the sound reproducer carried by the tone arm has completed the reproduction of sounds recorded on the record.

To avoid a waste of current in case the releasing arm 30 of the hereinbefore described automatic switch mechanism should fail to perform its function within the proper limit of time, this invention provides improved automatic timing mechanism so combined with the hereinbefore described releasing mechanism as to positivelyrelease the switch lever 11 after the talking machine has operated for a predetermined period slightly longer than that necessary for reproducing the largest record for which the talking machine is designed.

This improved timing mechanism includes an actuating member such as a I ratchet wheel 35, which is arranged in a horizontal plane spaced slightly above the plane of the base plate 6 and is rigidly secured to the upper end of a vertical ratchet shaft 36, which projects through the base plate 6, and which is arranged to be rotated about a fixed vertical axis coincident with its longitudinal axis to rotate the ratchet 35 in a clockwise direction.

The lower end of the ratchet shaft 36 is connected in any suitable manner to be rotated at a predetermined rate of speed withrespect to the turntable spindle 5 of the talking machine. Forinstance, the lower end of the ratchet shaft 36 may be provided with a worm gear 38 rigidly securcd thereto and engaging a worm 39 on one end of a horizontal shaft 40, to the other end of which is rigidly secured a worm gear 41 engaging a worm 42 coaxial with and rigidly secured to the turntable spindle 5, the horizontal shaft 40 being arranged to rotate about a fixed axis coincident with its longitudinal axis and being held against longitudinal movement in fixed terminal bearings 43.

For transmitting movement from the ratchet wheel 35 to the latch 25 to release the switch lever 11, a pawl-like kick off lever or releasing member 50 is arranged substantially in a plane'with the ratchet wheel 35, to oscillate in a. fixed plane about a vertical pivot 51 extending approximately centrally therethrough and which is rigidly secured at its upper end to one end of an arm comprising a substantially flat carrier plate or supporting member 52, which is arranged to swing in a horizontal plane slightly above the plane-of the upper surface of the ratchet wheel 35 about avertical pivot 53, which extends through the other. end of the said arm or carrier plate and the lowerend of cured to the switch lever 11. .The oscilla; tion of the pawl-like kick ofl? lever 50 with respectto the carrier plate 52 is limited in a clockwise direction by a lug. or stop 55 integral with and projecting upwardly from the kick ofi lever and arranged to engage against a side edge of the carrier plate, 52. An auxiliaryspi'ral spring 56 is connected at one end to the lug 55 and at its other end" to a lug 57 integral with and projecting upwardly from. the switch lever 11, and tends to hold the kick off lever 50 at the limit of its clockwise movement" with respect to the carrier plate 52. This auxiliary spring 56 also tends to swing the tion with respect to the switch lever 11 and 25 and is into enga ement with a lug or sto 58 integral wit and pro'ecting-upwar y from the base plate 6 and arranged to limit the anti-clockwise -movement of the carrier plate 52 with respect to the switch lever 11, and the auxiliary spring 56 thus tends to Hold-the pawl-like outer end 59 of the kick -,ofi' lever 5.0 inengagement with the.

ing front walls '66 of the teeth 67 of the ratchet 35 are preferably substantially cylindrical and of the sameradius of curvature, and the back walls 68 of the teeth of the ratchet 35 are flat and substantially tangent to the front walls 66, to provide I relativelybroad bearing surfaces and to in sure smoothness parts. end 62 of the kick 01f? lever is also preferably cylindrical to insure smoothness of operation between the kick off lever and the flat shoulder 63 of the latch 25. i

To insure the movement of the switch lever from an on to an 01f position, in

case the spring 29 should fail to perform its,

a rigid function after the latch 25 has been releasedkick off leverv from the switch lever,- the 50 is provided with alug 60 integral and therewith and projecting upwardly therefrom and arranged to limitthe anticlockwise movement of the kick ofi' lever 50 with respect to the carrier plate 52 by engaging againstthe outer end wall 61 of the carrier plate52.- lncase of the remote contingency that the spring 29 should i1 to perform its function of swinging t e switch lever 11 from an on to an of.

which is rigidly se-,

carrier plate 52 in an anti-clockwise dirie'c move the anti-clockwise direction of operation between these The activeend wall 69 of the inner be operative as it to swing'the carrier plate 52 suddenly "in lever .50 has performed its function of releasing the-latch 25 from the switch lever 11 as will appear hereinafter, the continued rotation of the ratchet 35 rotates the lug 60 into engagement with the wall 61 of the carrier plate 52 and then causes'the carrier plate 52 to push the switchlever '11 from an on to an ofi' p'osition..

This mechanism is also operative to release the stop member 11 from the retaining the member 25 if for any reason the end 62 position immediately" after the kick oil' of the kick-off lever 50 should not engage the projection 64 of the latch or retainin v 2 member 25 and should thus fail to lift the retaining member to release the stop member therefrom. In the event that the end- 62 of the kick-01f lever 50 should fail to engage the projection 64 to lift the latch 25 I (if, for-instance; the end 62 of the kick-ofl' lever were to be broken off or bent laterally so as to permit it -to slide over or under'the projection 64 without lifting the latch) then therotation of the ratchet 35 would turn the pawl'50 about its pivot 51 until the lug 60 engages the outer end wall 61 of the plate or'connection 52.whereupon the continued rotation of the ratchet 35 would h pawl 50 and plate 52 (now rigid wit respect to each other) to theright.

Since the plate or. connection 52 is pivoted to the arm or extension of the stop member \11, the movement of these members to the right would turn the stop member 11 in an forcing the beveled wall or abutment of the notch 28 against the beveled. end 27 of the tooth 27 and cause the said tooth to slide upwardly thereon. As soon as thetooth 27 is out ofthe notch 28, the spring 29 'will immedi atelyact to throw the stop member 11 to stopping position;

lever 11 froman off or stopping-position into an on or non-stopping position without rotating the ratchet 35 anti-clockwise or backwards, the outer side edge of the carrier plate 52 is extended laterally and" providing an ab-; ruptly inclined comparative-1y short straight and a somewhat forms [an obtuse angle shoulder or cam surface 70 longer straight inclined edge wall or cam surface 71 extending the shoulder outwardly in a direction approximately radial with i'espect to the axis of the pivot 53 at the inner end of the carrierplate 52, and

0 permit of the resetting of the switch from the outer end of forming an acute-angle with the longitudinal axisof the carrier plate; This s it extends outwardly diately outside of the rier plate 52 when the a-n'on or non-stopping position, and will slides over the stop 58 from a point immeoulder.70 is so arranged that stop-58 for the carswitch leverll is in i its operative 50 and parts cooperating '25 is released, the carrier plate or arm rotated in a clock 'rection from an in engagement with the free end of the latch 'clockwiseby the auxiliary spring a clockwise direction and move the outer end 59 of the kick ofi? lever 50 out of the path of the teeth of the ratchet 35 as'the switch lever is moved from an on towards an 03 position. The inclined edge wall 71 is so arranged and of such a length that it will be operative to slide over the stop 58 and hold the inner end 59 of the kick ofi lever 50 out of the path of the teeth of the ratchet 35.

The ratchet 35 and the kick oli lover therewith are so proportioned that when the latch 25 isi in position to retain the switch. lever in non-stopping position (as shown in the drawings) and the kick off lever- 50 is in engagement with the ratchet 35, a partial rotation ofthe ratchet in a clockwise direction, in response to the rotation of the turntable spindle through a predetenninec number of revolutions somewhat greater than necessary to reproduce the sounds from the longest'record which the machine is adapted to receive, will cause a he kick off lever 50 in ratchetto rotate t an anti-clockwise direction about ts'pivot 63 of the latch 25 and release the latch from the switch lever v11.

During this movement of the kick off lever 50 in response'to the clockwise rota tion of the ratchet '35, and until the latch 52 is wise'direction away from and about the pivot 53 which is.

its stop 58 When the held in a stationary position. latch25 is released the switch lever 11 is ordinarily rotated in an anti-clockwise dion into. an off position of the action of the spring 29. his movement of the switch lever 11 from an on into an oil position cuts o the current from the motor, tion of the motor and consequently the totation of the ratchet 35, and moves the carrier plate or arm 52 anti-clockwise about its pivot 53 as the shoulder and the inclined edge 71 successively slide over the stop 58 and simultaneously end 59 of the kick ofi lever50 out of the path of the teeth of the ratchet 35, thus rmitting the kick oil lever to be rotated 56 until the stop of the kick ofi. lever comes into engagement with the carrier plate 52, where it remains while the switch lever is in the off position. When the switch lever 11 is in a stopping-or rier plate or arm 52 rests with the outer portion of its inclined edge 71 against the stop 58 and holds the outer end.59 of the kick oil lever out of the path of the teeth of the ratchet 35.

' tween two teeth of tooth of the vided with any other number of timerequired for releasing stops the opera.

moves the outer f the invention without oil position, the carnon-stoppmg position, means to move said released from said movable .When the switch lever clockwise from a stopping or into a non-stopping or I the motor and the rotation of the turntable spindle 5, the carrier plate -52 is also moved and its inclined edge 71 slides on the stop 58, keeping the outer end 59 of the kick off. lever 50 out of the path of the teeth of the ratchet 35, but when, in its continued movement the abrupt. shoulder 70 slides over the stop 58 the outer end 59 of the kick off lever moves down into engagement with the ratchet.

In the form of this invention shown in the drawings, the ratchet is provided with nine teeth and the construction is such that the manual movement of the switch lever 11 from an ofi position into an on position results inv the movement of the kick 0E position 1 off lever 50 into its initial position in which its outer end 59 is in the space be tially in contact with the front wall 66 of one of the teeth. o

The ratchet 35 might, however, be prothat shown in the drawings, and the device would still operate successfully, although in some cases the kick oil lever 50, when in an initial operative position, would not rest with its outer end 59 in in a recess between two teeth as shown in the drawings, but would rest with its outer end 59 riding either upon the top or upon the back wall of a tooth, and the kick oil lever would not be rotated with respect to the carrier plate 52 until the ratchet had rotated through a sufficient arc to permit the outer end of the kick off lever to move into full engagement between two teeth and to be engaged by of the teeth of the ratchet. By thus varying the number of teethin the switch lever 11 through the action of the kick off lever 50 might be varied.

the front wall 66 of one is moved manually on position to start the ratchet and substanteeth than full engagement the ratchet 35, the

It is to be-understood that this invention is not limited to the specific construct-ion hereinbefore described, as it is evident that various changes might be made in applying departing from the spirit of the invention or the scope of the appended claims.

Having thus fully described this invention, I claim and desire to protect by Letters Patent of the United States:

1. Automatic stopping mechanism comprising an element movable from a nonstopping into a stopping position, movable means arranged to hold said element in a a movable ed to be or actuating said movable means to release said element, said releasing means being con I neeted to said element and arranged to be element in a said element when released by said movable means.

2. Automatic stopping mechanism com-' said movable means.

a from a non-stopping 3. Automatic stopping mechanism comprising in combination an element movable tion, movable means arranged to hold said element in a non-stopping position, means to move said element, when released from said movable means, to a stopping position, a rotatablemember,

member for actuating said movable means to release said element, said releasing means comprising an element connected to and movable with respect to said first-mentioned 'element out of operative engagement with said rotatable member when said element is moved to an inoperative position.

4. In an automatic combination of a stopping member, retaining means to hold-said stopping member in non-stopping position, a spring tending to move said stopping member to stopping position, a continuouslyrotating-ratchet, an arm connected to said stopping member, a pawl member inengagement with said ratchet. and connections between said arm and said pawl whereby the rotation of said ratchet first moves said pawl member into rigid relation with respect to said arm, and

- the continued rotation of said ratchet moves said arm and pawl together to force said stopping member out of engagement with said retaining means.

5. Automatic stopping mechanism comprising in combination an element movable from a non-stopping into a stopping position, movable means arranged to hold said element in a non-stopping position, means tomove said said movable means, into stopping position, a ratchet wheel rotatable about a fixed axis,

and releasing means arranged to be actu ated by said ratchet wheel for actuating moved out of operative engagement with sald movable member by the movement oflawn, movable means arranged to ho d element, when released from and arfixed axis for holding said into a stopping post and releasing means ar-v .ranged to be actuated by. said rotatable stop mechanism, the

said pivoted means to element, when released from said movable means to release'said element, said releasing means, being arranged to be moved into and outof operative engagement with said ratchet wheel by the movement of said element. l

6. Automatic stopping mechanism corm. prising in combination an element movable f rom a non-stopping into a stoppin posii sa1 element in a non-stopping position, means to move said element, when released from said movable means, into stopping position, a' ratchet wheel rotatable about a fixed axis, and releasing means connected to said element and arranged to be actuated by said ratchet wheel for actuating said movable means to release said element. p

7, Automatic stopping mechanism comprising in combination an element movable from a non-stopping into a stoppin posi tion, a member pivoted to swing a outaelement in anon-stopping position, means to move said element, when released from said pivoted member, into sto ping position, a ratchet wheel rotatable ab v leasing means connected to said element and arranged to be actuated by the teeth of said ratchet wheel toactuate 'said out a fixedaxis, and re- 8. Automatic stopping mechanism comprising in combination an element pivoted to swing about a fixed axis from a nonstopping into a stopping position, means pivoted to swing about a fixed-axis for holding said element in a non-stopping position, means to move said element, when released from said pivoted means, into'stopping position, a ratchet wheel rotatable about 'afixed axis, and releasing means arranged to be moved into and out of operative engagement with said ratchet :wheel by the movement of said element, and arranged to be actuated by said ratchet wheel to actuate release said element. 9, Automatic stopping mechanism comprising in combination an element arranged to oscillate about a fixed axis from a nonstopping into a stopping position, movable means arranged to hold said element in a non-stopping position, means to'move said element, when released from said movable means, into stopping position, a ratchet wheel rotatable about a fixed axis, and a member arranged to engage and to be actuated by said ratchet wheel and to engage and actuate said movable means, said member being arranged to be moved into and out of operative engagement with said ratchet wheel by the movement of said element.

10. Automatic stopping mechanism comprising in combination an element arrangednon-stopping position,

. able means to release said able with respect means to move said element, when released from said movable means, into stopping position, a ratchet wheel rotatable about a fixed axis, and releasing means including a member arranged to engage and to be actuated by said ratchet wheel and to engage and actuatesaid movelement, said member being connected to said element and being arranged to be moved into and out of operative engagement with said ratchet wheel by the movement of said element.

11. Automatic stopping mechanism comprising in combination an element arranged to oscillate about a fixed axis from a nonstopping into a stopping position, movable means arranged to hold said element in a non-stopping position, a ratchet wheel rotatable about a fixed axis, a supporting member connected to and movable with respect to said element, a releasing member carried by and arranged to oscillate with respect to said supporting member and arranged to engage and be actuated by said ratchet wheel and to engage and actuate said movable means to release said element, and-means to move said element when released, into stopping position.

12. Automatic stopping mechanism comprisin in combination an element arranged to oscillate about a fixed axis from a nonstopping into a stopping position, movable means arranged to hold said element in a non-stopping position,'a ratchet wheel rotatable about a fixed axis, means to rotate said ratchet wheel, a supporting mem ber connected to and movable with respect to said element, a releasing member carried by and arranged to oscillate with respectto said supporting member and arranged to engage and be actuated by said ratchet wheel and to engage and actu'ate said movable means to release said element, and yielding means connecting said releasing member and said element.

13. Automatic stopping mechanism comprising in combination an element arranged to swing about a fixed axis from a non-stopping into a stopping position, means movto said element for holding said element in a non-stopping position, means to move said element, when released from said movable means, into stopping position, a ratchet wheel rotatable about a fixed axis, means arranged to rotate said ratchet wheel, a supporting member pivot ally connected to said element and arranged to oscillate with respect thereto, a fixed stop arranged to be engaged by said supporting member, a releasing member pivotally con nected to said supporting member and rotatable with respect thereto, a stop carried by said releasing member and arranged to engage said supporting'member, and yielding means connecting said second mentioned stop and said element, said releasing Ymember being arranged to be actuated by said ratchet wheel to actuate said movable means to release said element and said supporting member being arranged to slide against said fixed stop to move said releasing member out'of engagement with said ratchet wheel as said element is moved from a non-stopping towards a stopping position. 14. Automatic stopping mechanism comprising in combination an element pivoted to swing about a fixed axis from a non-stopping into a stopping position, a latch pivoted to swing about a fixed axis and arranged to engage said element to hold said element in a non-stopping position, yielding means' connecting said element and said latch and tending to rotate said element from a nonstopping into a stopping position. a supporting member pivotally connected to said element and arranged to oscillate with respect thereto, a fixed stop arranged to be engaged by said ing member pivotally connected to said supporting member and rotatable with respect thereto, I a i stop carried by said releasing member and arranged to engage said sup-' porting member, and yielding means con meeting said second mentioned stop and said element, said releasing member being arranged to be actuated by said ratchet wheel to actuate said latch, to release said element, and said supporting member being arranged -to slide against said fixed stop to move said releasing member out of engagement with said ratchet wheel as said element is moved from a non-stopping towards a stopping position. Y I

15. An automatic stopping mechanism comprising in combination a movable element normally held in non'stopping position, releasable means normally holding said element in non-stopping position. re leasing means carried by said element, a ratchet wheel rotatable about a fixed axis and adapted to move said releasing means a ainst said releasable means to release: said e ement, and means to move said element, when released, into stopping position and said releasing means out of operative engagement with said ratchet.

. 16. In, an automatic stopping mechanism the combinationiof a member movable from a non-stopping to a stopping position, means-tending to move said member to said stopping position, releasable means to hold said member in said non-stopping position, a lever pivoted to said member, a rotating element, means to rotate the same, .and means carried by said lever, and directly engaging with and operated by said rotating element for forcing said releasable means out of holding engagement with said movable member, said movable member when released being operative to move said lever su ortin member a releasv and said means carried thereby,

rotating ele- .out of operative engagement with, said ment. c 17. In an automatic stop ,ing' mechanism, the combination of a releasable-element movable back and forthbetween a non-stopping and a'stopping position, holding means to normally hold said element in a non-stopping position, mechanism movable with said element for actuating said holding meansto release said element, driving means for I actuating said mechanism and operativeto to move said mechanism out of en move said mechanism against said holding means, and means to move said element, when released, into stopping position and agement with said holding means and sai driving means. w

18. In an automatic stopping mechanism, the combination of a, stopping element movable back and forth between a non-stopping and a stopping position,

, said element inia non-stopping position,

combination of an electric switch,

into operative engagement as the combination of a mova mechanism movable with said element for moving said holding means and releasing said element, means for actuating said mechanism, and means for throwing said actuating means and said mechanism out of trio circuit, a continuously rotating ratchet, -an arm connected to said switch, a pawl member in engagement with said ratchet, and connections between said arm and said pawl member whereby the rotation of said ratchet first moves said pawl'member into rigid relation with respect to said arm and the continued rotation of said ratchet moves, through said arm and pawl member, said switch to break the electric circuit.

21. In an automatic stop mechanism the combination of .a stopping member, an arnr pivoted thereon, a pawl member pivoted to said arm, actuating means engaging said pawl member to transmit motion to said stopping member, and means for disengaging said pawl member from said actuating means.

V 22. In an automatic stop mechanism, the combination of a stopping member, retainmeans for holding le element, auto-- manual means for moving said" ing means. for holding said stopping member at the limit ofits movement inone direction, means for moving said stopping men1ber in the opposite direction, an arm pivoted to said stopping member, a pawl member pivoted to said arm, andactuatingmeans engaging-said pawl member to release said stopping memberfrom said retaining means. I

i 23'. In an automatic stop mechanism, the combination of a stopping member, retaining means for holding said stopping. member at the limit of its movement in one direction,

means for moving said stopping member in the opposite direction, anarm pivoted to said stopping member,

'oted to said arm, actuating means engaging" a pawl'membe'r pivsaid pawl member to release said stopping member fromsaid retaining means, and means for disengaging said pawl member from said actuating mea 24. In an automatic stop mechanism, the

combination of a stop -.member,movable from a non-stopping to a stopping position and having an abutment, retaining means engaging said abutment to hold said member in non-stopping position, a spring tending to move said member into stopping pos'ition, and automatic means to move said abutment with respect to said retaining means to disengage saidretaining means from said abutment, whereupon said spring will throw saidstop member to stopping position.-

25. In an automatic stop mechanism, the

combinationof a stop member. movable from a non-stopping to a stopping position and having an abutment, retaining means engaging said abutment to hold said memr in non-stopping position, a spring tending to move said member to stopping position, a ratchet arranged to be continuallyrotated, a pawl in engagement with said ratchet, and

a connection between saidv pawl and said stop member .whereby the rotation of said ratchet at firstmoves said pawl with respect to said connection and the continued movement of said ratchet moves said pawl and through said connection moves said abutment to.disengage said abutment from said retaining means.

.26. In an automatic stop mechanism, the combination of a pivoted stop member having an arm extending therefrom, retaining means for holding said member in non-stopping position, a spring for moving said member to stopping position when said member is released from said retaining means, a'continuously rotating ratchet, a pawl engageable with said ratchet, and a rigid connection between said pawl and said arm whereby the rotation of said ratchet first moves said pawl into rigid relation with respect .to said connection and the continued rotation of said ratchet moves said awl, said connection and said arm together 0 re use prising in lease said stop member from said retaining means.

27. Automatic stopping mechanism comcombination an element movable from a non-stopping into a stopping position, a member pivoted to swing about a fixed axis for holding said element in a non-stopping position, means to move said element, when released from said pivoted member, into a stopping position, a ratchet wheel rotatable about a fixed axis, and-releasing means connected to said element and arranged to be actuated by said ratchet wheel to release said element.

In Witness whereof, I have hereunto set 15 m i hand this 4th day of August, A; 1)., 19 4:.

, LLOYD Y; SQUIBB.

W'itnesses DAVID W. EVANS, CHARLES F. WILLARD.

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