US686435A - Type-writing machine. - Google Patents

Description

No. 686,435. Patented Nov. 12, 190:.

' w. J. BARRON;

TYPE wnmna Momma.

(Application filed June 28, 1899.) (No Model.) 2 Shoots-Sheet L' INVENTEIE' ATTORNEY me mums PETERS c0 mom-umu, wAwNar'oN, u. c.v

'VJiTNESEES Patented Nov. I2, I90I. W. J. BARRON. TYPE WRITING MACHINE. (Application filed Jung 28, 1899.)

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(No Model.)

UNITED STATES.

T PATENT OFFICE.

WVALTER J. BARRON, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE DENSMORE TYPEWRITER COMPANY, OF SYRACUSE, NEIV YORK, A CORPORATION OF NEW YORK.

I TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 686,435, dated November 12, 1 901. Application filed June 28, 1899. Serial No. 722,106. (No model.)

To rtZZ whom it flea/y concern.-

Be it known that I, WALTER'J. BARRON, a citizen of the United States, and a resident of the borough of Brooklyn, in the city of New York, in the count-yof Kings and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

The present invention relates to escapement mechanisms for type-writing and like machines, and has for its main object generally to improve and increase the capacity thereof.

In a well-known class of type-writing ma chines the escapement mechanism includes a rack (straight or segmental or circular) .and eoacting feed-dog s, the rack and the dog-carrier having relative motion at right angles to the plane of the rack. In some cases the escapement mechanism has been especially adapted to the use of those operators who maintain a high rate of speed in type-writing, while in other cases the escapement mech'an ism has been adapted 'to the use of those operators whose speed in operating the typewriting machine may be said to be relatively slow. In the first case the letter-space feed is arranged to commence after a keyis struck and before the impact of the type, as in the so-called reverse-feed or speed escapement, while in the second case the letterspace feed takes place after the impact-of the type and during'the return of the type-operating parts to normal position, and operators of the first class find it difficult satisfactorily to operate a machine intended for the use of the other class of operators. ments aforesaid there is provided ordinarily a stop for the rocking or reciprocatory element of the cscapement mechanism, which stop coacts with a fixed part or abutment on the framework of the machine at about the moment of impact of the type and, through the connecting mechanism, acts as a buffer or stop for the depressed key, thus somewhat of the operator. I

One object of the present invention is the provision of an escapement mechanism which In the escapemay be adapted at will to the use of eitherof the classes of operators above named.

Another object is to obtain a quick return of the normally-disengaged dog.

Another object is to avoid the shock to the fingers above described, and other objects, as will hereinafter more fully appear.

To these ends the invention consists of features of construction and combinations of devices hereinafter described, and more particularly pointed out in the appended claims.

The preferred form of the invention is illustrated in the accompanying drawings, forming part of this specification, in which- 'Figure l is a central longitudinal vertical sectional View of a well-known form of typewriting machine,(Remington No.6,) in which my improvements are embodied. Fig. 2 is a rear view of the improved escapement mechanism, parts of the frame of the machine being broken away and in section. Fig. 3 is an enlarged perspective View of the escapement mechanism shown in Figs. 1 and 2. Fig. 4 is a perspective view of the holding-dog and a stop shown in Figs. 1, 2, and 3. Figs. 5, 6, 7,'and 8 are diagrammatic plan views illustrative of the operation of the mechanism when usedasareverse-feedescapement. Fig. 9 is a vertical sectional view through the rocker-arm and showing the manner in which the pivoted feed-dog may be converted from a relatively fixed to a stepping feed-dog, its

position as a fixed feed-dog being shown in full lines. Figs. 10, 11, and 12 are diagrammatic plan views illustrative of the operation of the mechanism when the same is used as a non-reverse or ordinary feed escapeinent. Fig. 13 is a perspective view of a modification in which a straight rack is used instead of a circular rack or ratchet-wheel, as shown in Figs. 1, 2, and 3. Figs. 14 and 15 are diagrammatic views of modifications. Fig. '16 is a side or face view of the'spring 44. and means for mounting it adj ustably.

In the various views of the drawings the used to designate the same part.

Referring to the drawings, 1 indicates the base-frame of a well-known form of typewriting machine; 2, uprights or standards atsame reference character or numeral will be tached to the base-frame; 3, a top plate or type-ring attached to the standards 2; 4, typebar hangers attached to the ring 3 in a usual or suitable manner; 5, type-bars pivotally connected with the hangers .4; 6, rods connecting the type-bars with key-levers 7; 8, a

rib underneath the top plate of the base 1 andwith the lower edge of which the notched upper edges of the key-levers 7 engage; 9,springs connected with the base 1 and pressing the key-levers 7 into engagement with the rib 8; 10, a space-bar borne by levers 11; 12, a universal bar underlying the levers 7 and 11 and provided with hooked rods 13; 14, a transverse bar over which the hooked ends of the rods 13 engage; 15, an arm projecting forwardly from a shaft 16, which is journaled, as usual, in the bracket 17, depending from the top plate 3; 18, a spring connected with the shaft 16 and the bracket 17 and acting to hold the arm 15 upwardly against the bottom of the frame 17; 19, an adjustable stop borne by the arm 15 and adapted to coact with the bottom of the hanger 17 to limit the upward motion of the arm 15, bar 14, and universal bar 12; 20, an upwardly-projecting dog-carrier or rocker-arm.

21 is the platen, which is journaled in the platen-carrier 22; 23, the main carriage, with which the platen-carrier is connected in the usual manner; 24 and 25, guide-rods upon which the main carriage is guided in its transverse movements; 26, a shift-rod upon which the roller 27 of the platen-carrier runs.

28 is a rack connected with the carriage 23 by arms 29, which are pivoted to the carriage at 30; 31, a toothed wheel with which the rack 28 engages, the said toothed Wheel being borne by a shaft 32, which is journaled in a sleeve 33, secured to the top plate 3 of the machine.

34 is a circular rack or ratchet-wheel, which is connected with the shaft 32 in any usual or suitable manner, as by a backing-ratchet inelosed in the casing 35.

36 indicates a spring-drum, which is connected with the carriage 23 by a strap 37.

The foregoing devices are or may be of any usual or known construction.

In that form of the invention illustrated in the accompanying drawings the rocker-arm 20 is slotted vertically at 38 and a feed-dog 39 is pivotally connected with the rocker-arm by means of a pin 40, which passes through a perforation in the dog and is secured to the rocker-arm in the usual manner. The upper end 41 of the rocker or dog-carrier 20 forms a stop or abutment for the dog 39. The dog 39 is formed with shoulders 42 and 43, respectively, above and below its pivot 40, and the carrier 20 is provided with a spring 44, adjustable vertically thereon by means of a screw 45 and holes (or equivalent slot) in the spring, whereby the spring may be adjusted so that its force may be exerted at a point below the axis 40, as at the shoulder 42, or above the axis 40, as at the shoulder 43, to turn the feed-dog about its pivot. When the spring 44 ooacts with the shoulder 42, as shown in full lines in Fig. 9, the dog 39 is held against the stop 41 by the spring, so that during the advance movement of the carriage the dog 39 is, in fact, a rigid or non -stepping dog, although it may yield to permit the teeth of the rack to slip over it upon the reverse movement thereof, the position of the dog at such a time being indicated in dotted lines at Fig. 9. When the spring 44 is adjusted so that its point or end ooacts with its shoulder 43, as indicated in dotted lines in Fig. 9, the spring pushes the dog 39 away from the stop 41 until the shoulder 42 is arrested by the bend 47 in the spring 44, all as indicated in dotted lines in Fig. 9. By the described adjustment of the spring 44 the dog 39 is converted from a non-stepping to a stepping feed-dog, and vice versa.

Another feature of the present invention is the provision of means whereby a gradual resistance to and stop for the keys and reciprocatory member of an escapement mechanism takes the place of the fixed and practically inelastic stop or stops heretofore employed for arresting the reciprocatory member of an escapement mechanism upon the depression of type-operating keys. The prior fixed stops aforesaid have usually been provided with a sound-deadening substance, as leather; but this only partially reduces the shock to the fingers hereinbefore spoken of. Such prior stops are commonly adjustable, and the adjustable part is sometimes upon the rocker and ooacts with a fixed abutment on the frame and in other cases is placed upon a fixed part of the framework and ooacts with the rocker. That feature of the present invention now under consideration comprises a spring-stop for a member of an escapement mechanism or of escapement-operating mechanism, which stop is normally inactive and is brought into operation when a reciprocatory member of the escapement reaches a predetermined point when operated by the depression of a key and thereafter forms a gradually-increasing resistance to and stop for the said recip'rocatory member and the key. In that form of the invention illustrated in the accompanying drawings the spring-stop aforesaid is carried by the rocker-arm 20 and is normally inactive or removed from contact with the rack member of the escapement and comes into contact with such rack member when the rocker-arm 20 reaches a given point in its forward swing upon a depression of a key-lever and provides a firm but yielding or elastic resistance to the finger, thus transferring the shock from the finger to the said spring-stop. As shown in the drawings, the said spring-stopis integral with the holdingdog, which is the preferred arrangement for carrying this and certain other parts of the invention into effect; but it is to be understood that the stop and dog need not be integral with each other or even united, but that one may be located in one place and coact with one part and the other may be elsewhere located and coact with some other part without departing from this invention.

Referring to the drawings, there is shown a vertically-disposed arm 48, which is pivoted to the rocker 20 by means of'a screw 49, which passes through aperforation inthe arm 48 and engages with a threaded hole in the rocker 20, the said axis or screw 49 being at right angles to the axis 16 of the rocker 20. At its upper end the arm 48 is provided with a horizontally-extending threaded hole to receive a screw 50, which forms the axis of motion of a plate 51, which is provided with a bored-out portion 52 to receive the screw 50, which is parallel with axis 16. The upper part 52 of the plate 51 is arranged to coact with a side of the ratchet-wheel 34 or rackhar 34, as the case may be. The plate 51. is provided with an adjustable screw 53, adapted to coact with the rear face of the arm 20-to limit the motion of the plate 51 in on c direction, a lock-nut 54 being placed upon the screw 53 to prevent accidental displacement thereof when once adjusted. A leaf-spring 55 is secured to the rear face of the arm 48 by means of a screw 56, and the free end of the spring 55 bears against the rear side of the plate 51 and pushes the said plate forwardly of the machine as far as the screw 53 and arm 20 will permit. The rocker-arm 20 is provided with two rearwardly projecting cars 57 58,and these ears are provided with adjustable screws 59 60,which form stops for limiting the motion of the arm 48, above mentioned. Jam-nuts 61 62 prevent accidental displacement of the stops 59 and 60. A spring 63, secured to the shaft 16 by a screw 64, is so tensioned as normally to press the arm 48 against the stop 60. The plate 51 is provided with a forwardly-projecting lip or lug 65, which is adapted to coact with the teeth of the rack 34 (or 34*) and forms the holding-dog or that dog which is normally out of engagement with the rack.

The operation of the foregoing deviceswhen used for a reverse-feed or a .speed cscapement, so called, is as follows, reference being had more especially to Figs. 5 .to 8, inclusive: Fig. 5 illustrates the normal positions of the parts, in which the dog 39 (arranged to be non-stepping) is in engagement with a tooth 34 of a rack and in which the holding-dog is arranged with its working face in or substantially in the same plane as the working face of the dog 39, the arm 48 being against the stop and therebeinga clear space between the arm 48 and the stop 59 sufficient to provide for a movement ofthe dog equal to or slightly less thanthe distance between the working faces of successive teeth of the rack. Upon the depression of a key the rocker-arm 20 is moved forwardly as indicated by the arrow at Fig. 5, and the holding-dog 65 is brought into engagement with the working face of thetooth 34 and the face 52 of plate 51 strikes the side of the'rack before the latter is released by the feed-dog 39, all as illustrated in Fig. 6. The type-operating mechanism and the connections between the same and the rocker 20 are so adjusted and timed as that the type makes its impact on the platen just after the rack is wholly disengaged from dog 39 and the carriage begins to move forward. It will be observed in Fig. 6 that the face 52 rests against the rack-teeth and that the limiting-stop 53 still rests against the rocker-arm 20. The rocker-arm 20 continues to move forward after the impact of the type upon the platen until the depressed key ceases to descend; but the engagement between the rack and the face 52 prevents the holding-dog 65 from moving thereafter relatively to the rack-tooth with which it is engaged, (except for a minute sliding or rubbing motion due to the fact that the axis 50 continues to move with the rocker 20; but this rubbing motion may be disregarded in so far as the main purposes of this construction are concerned.) This continued forward motion of the rocker 20 moves the latter away from the stop 53 and the plate 51, as indicated in Fig. 7, in which it will be observed that the dog 39 is in position to engage with the working face of the succeeding tooth 34 of the rack on the return movement of the rocker. When dog 39 is once disengaged from the rack, the carriage-spring is free to act and moves the carriage forward, thus carrying arm 48 over against the tension of spring 63 until the arm is arrested by the stop 59, which of course also arrests the dog 65 and the forward motion of the carriage. The type rebounds instantly on its impact on the platen, owing to the looseness in the joints of its actuating mechanism, and the operator, warned by the increased but yielding resistance due to spring 55, instantly removes the finger from the depressed key, whereupon springs 18 and 55 act to return the rocker to the rear at a greater speed than would be the case were the spring 18 alone employed for that purpose and so hasten the disengaging action between the rack-tooth 34 and the, dog 65 and the engagement of tooth 34 anddog 39. During the rearward motion of the rockerarm 20v the holding-dog 65 and the springpressed plate 51 remain stationary relatively to the rack until the arm 20 comes into contact with the screw 53, and thereafter the holding-dog and plate are moved rearwardly in unison with the rocker-arm 20, and thedog 39is moved into positionin front of the sue.- ceeding rack-tooth 34 as .indicated at Fig. 8. As soon as the dog 65 has been carried out of engagement with the rack by thev carrier 20, stop 53, and plate 5lrthe spring 63 re,- turns the arm48, plate 51, and dog-65 to their normal position, wherein stop 60 coacts with the arm 48, and itis noted that the parts maybe adjusted so as to provide for a minute space between the workingfaces of the dog 39 and of the rack-teeth at such time, so that when the dog 65 is wholly disengaged from the rack-tooth with which it may be temporarily engaged a very slight motion of the rack brings the succeeding rack-tooth into engagement with the dog 39. It will be observed that the spring 55 and the stop operated thereby offer no resistance to the depression of a key until such time as that the stop comes into contact with a side of the rack and that the resistance then offered gradually increases until the key is fully depressed or until it comes to a stop and that such resistance practically transfers the shock from the finger of the operator to the spring 55.

The operation of the foregoing devices when adjusted to cause the letter-space feed after the impact of the type is as follows, reference being had more especially to Figs. 10, 11, and 12: In making such adjustment of parts from the positions shown in Figs. 3, 5, and 9 the jam-nut 61 is loosened and the screw 59 operated to hold the arm 48 permanently against the stop 60, and the jamnut 61 is tightened up to prevent accidental motion of the screw 59. In other words, the arm 48 is locked against motion upon its pivot 49, this position of the parts being indicated in Fig. 10. At the same time the spring 44is adjusted from the position shown in full lines in Fig. 9 (which is its position in the operation above described in connection with Figs. 5 to S, inclusive) to the position shown in dotted lines in said Fig. 9, thus converting the dog 39 from a non-stepping to a stepping feed-dog. Upon the depression of a key after such adjustments are made the rockerarm 20is moved forwardly, as indicated by the arrow at Fig. 10, and the dog is brought into engagement with the rack before the dog 39 is disengaged from the rack-tooth 34?, as shown at Fig. 11. The rocker moves forward until after the impact of the type and the disengagement of the dog 39 from tooth 34 whereupon the dog 39 is thrown away from the stop 41 by the spring 44 and assumes the position illustrated in Fig. 12, at which time the plate 51 is against a side of the rack, the stop 53 is no longer in contact with the rocker 20, and spring 55 is under greater tension. The forward motion of the rocker-arm 20 from the position shown in Fig. 11 to that shown in Fig. 12 causes the same to leave the stop 53, dog 65, and plate 51 behind in the manner above described in connection with Figs. 5 to 8, except thatthe dog 65 and arm 48 do not move on pivot 49, and the arresting action of the spring 55 is the same as in the previous case. Upon the release of the depressed key the rocker-arm 20 is instantly restored to normal position and dog 39 is instantly engaged with and dog 65 disengaged from the rack by the action of the springs 18 and 55. The relative action of the rocker-arm 20, stop 53, dog 65, and plate 51 in this case is similar to that above described, the dog 39 being moved while disengaged from the rack by spring 44 one step to be in position to pass in front of the succeeding tooth 34 of the rack on the release of the depressed key. It will be observed that the dog 65 has now no motion in a direction parallel with the rack 34 or 34:, but that it has motion upon an axis parallel with the axis 16, and it will be observed, therefore, that the carriage-feed does not take place until after the release of the depressed keythat is to say, not until after the impact of the type upon the platen or the substance thereon on the upstroke of the key and while the key is returning to normal position.

It is obvious in the adjusted positions of the parts illustrated diagrammatically in Figs. 10, 11, and 12 that any desired amount of drop of the rack-tooth from the working face of the dog 39 to the working face of the dog 65 may be provided for by means of the adjustable stops 59 and 60, and then in such case a portion of the letter-space feed may take place before and the remainder take place after the impact of the type upon the platen, though it is preferable that the amount of such drop should be reduced to a minimum.

.In the modification illustrated at Fig. 14 the plate 51 is extended at 51 and the fixed frame 17 of the machine is provided with a stop 66 for coaction with the said extension during the forward motion of the rocker 20 to arrest dog 65 for the purpose of putting spring 55 under greater tension to cushion the finger-strokes as aforesaid, and in this case there is no contact between the rackteeth and plate 51. The operations otherwise are substantially the same as in the cases illustrated in Figs. 5 to 12, inclusive.

The modification illustrated in Fig. 15 is identical in construction and operation with that illustrated in Fig. 14:, except that the stop 66 is fast to the extension 51 and coacts with the frame 17 to arrest the dog 65 for the purposes described in connection with Fig. 14.

What I claim as new, and desire to secure by Letters Patent, is-

ICC

IIO

1. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog normally engaged therewith, and a dog normally disengaged therefrom, each dog during the escapement movements passing successively into and out of each toothspace of the rack, and the said normally-disengaged dog being springpressed toward said rack, whereby it is adapted to yield, when engaged with the rack, upon a continued depression of the key, so as to cushion the key-action and effect a quick return of the dog to normal position upon the release of the key.

2. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-rocker, a dog arranged thereon and normally engaging the said rack, and a dog pivoted on said rocker and havingits pivot parallel with the pivotal axis of the rocker, each dog during the escapement movements passing successively into and out of each tooth-space of the rack, and the said pivoted nected with said carrier by twoaxes at right angles to each other, whereby it may move in a direction parallel with the rack and whereby there may be a relative movement of the said dogs away from or toward each other.

4. In a type-writing machine and in an escapement mechanism, the combinationof a rack, a pivoted rocker, a dog arranged thereon, and a second dog that is normally out of engagement with said rack and is pivotally connected with said rocker by two axes at right angles to each other and one of which is parallel with the pivotal axis of said rocker, whereby the second dog may move in a direction parallel with the rack and whereby the said dogs may move together in fixed relationship or one of them may have a movement away from and toward the other.

5. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog arranged thereon and normally engaging said rack, a second dog pivoted to the carrier on an axis parallel to the rack, and yielding stop means for holding the second dog in engagement with the rack while the rack and carrier have further relative motion.

6. In a type-writing machine and in an escapement mechanism, the combination of a rack, a do -carrier, a dog arranged thereon and normally engaging said rack, a second dog connected to the carrier to move transversely of the rack independently of the carrier, and stop means for holding the second dog in engagement with the rack while the dog-carrier and the rack have further relative motion. I

7. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dograrranged thereon and normally engaging said rack, a second dog movable with and connected tothe carrier to move independently transversely of the rack, and stop means having a spring-pressed member connected to the second dog and adapted to hold it in engagement with the rack while the rack and carrier have further relative motion.

8. In a type-writing machine and in an escapement mechanism,-the combination of a rack, a dog-carrier, a dog arranged thereon and normally engaging said rack, a second dog connected with said carrier to move independently transversely of the rack and normally disengaged from therack, and stop means having a spring-pressed member connected with the second dog and adapted to hold it in engagement with and in a position which is fixed relatively to the rack while the rack and the carrier have further relative motion.

9.v In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, one of said rack and carrier elements being movable transversely: of the rack, a dog arranged on the carrier and engaging said rack, a second dog pivotally connected with the carrier by an axis parallel with the rack and normally disengaged from the rack, and stop means having a spring-pressed member connected. to the second dog and adapted to hold it in a position which is fixed relatively tothe rack while the rack and carrier have further relative motion.

10. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, said rack and carrier elements having relative motion transversely of the rack, a dog normally disengaged from the rack and connected with said carrier to move independently thereof in directions parallel with and at right angles to the rack, stop means for holding the dog in engagement with the rack while the carrier and rack have further relative motion, and returningsprings.

II. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, said rack and carrier elements having motion relatively to each other transversely of the rack, a dog pivotally connected with said carrier by two axes at right angles to each other and one of which is parallelto the rack and said dog being normally disengaged from the rack, a dog on said carrier normally engaged with the rack, stop means for holding the first-named dog in engagement with the rack while the rack and carrier have further relative motion, and returning-springs for said first-named dog.

12. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, said rack and carrier elements having relative motion transversely of the rack, a dog normally engaged with said rack,a dog normally disengaged from the rack and connected with the carrier by two axes at right angles to each other and one of which is parallel with the rack, a stop rigidly con nected with the second-named dog and adapted to coact with the rack to hold the said dog in engagement with the rack while the rack and carrier have further relative motion, a spring for pressing said second-named dog and stop toward the rack, a spring for moving said second-named dog in a direction parallel with the rack, stops for limiting the motion of the second-named dog in a direction parallel with the rack and one of said stops being adjustableto prevent any motion of the holding-dog in a direction parallel with the rack, whereby the letter-space feed of the carriage may be timed differently relatively to the time of impact of the type.

13. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a pivoted dog 39 on said carrier and normally engaged with the rack, a dog 65 pivotally connected with said carrier to move in a direction parallel with the rack, manually-operated means for changing the dog 39 from a non-stepping to astepping dog or vice versa, and manually-operated means for changing the dog 65 from a reverse-feed to a non-reverse-feed dog or vice versa,whereby one and the same escapement and typewriting machine may be adapted to the use of dilferent classes of operators.

14. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog 39 pivotally connected with said carrier and normally engaged with the rack, a dog 65 pivotally connected with the carrier by two axes at right angles 1 to each other and one of which is parallel with the rack, a stop rigidly connected with said dog and adapted to coact with the rack to hold the said dog in engagement with the rack while the rack and carrier have further relative motion, a spring normally pressing the dog 65 and stops toward the rack, means for changing the dog 39 from a nonstepping to a stepping dog, and means for changing the dog 65 from a reverse-feed to a non-reverse-feed dog, whereby one and the same escapement and machine may be adapted to the use of different classes of operators and whereby the usual shock to the fingers upon the arrest of the depressed keys is avoided.

15. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog 39 thereon normally engaged with the rack, a dog 65 connected with said carrier to move independently thereof in a direction transverse of the rack, an adjustable stop for regulating the distance between the dog 65 and the rack, a stop connected with the dog 65 and adapted to coact with the rack to hold the dog 65 in engagement with and in a position which is fixed relatively to the rack while the rack and carrier have further relative motion, and a spring pressing said dog 65 and stop toward the rack.

16. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog 39 normally engaged with the rack, a dog 65 connected with the carrier to move in two directions at right angles to each other and one of which is parallel with the rack, an adjustable stop for regulating the position of the dog 65 relative to the rack, a stop rigidly connected with the dog 65 and adapted to coact with the rack to hold said dog in engagement with the rack while the rack and carrier have further relative motion, a spring for pressing the dog 65 and stop toward the rack, and an adjustable stop for limiting the motion of the dog 65 in the direction of the rack and movable to prevent any such motion.

17. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog 39 pivotally connected with said carrier to move in a direction parallel with the rack, and a spring adjustable to engage with said dog at different places and acting in one such engagement to press the dog against a stop on the carrier and in another place to press the dog away from said stop, whereby the dog may be changed from non-stepping to stepping and vice versa.

18. In a type-writing machine and in an escapement mechanism, the combination of a dog-carrier, a dog 39 pivotally connected thereto, a stop on said carrier, a spring, and means for adjusting the spring so as to press the dog either against said stop or away therefrom as may be desired.

19. In a type-writing machine and in an escapement mechanism, the combination of a dog-carrier, a dog movable relatively to said carrier, a stop on said carrier for the dog and adjustable means for yieldingly pressing the said dog normally against said stop or away therefrom according to the adjustment.

20. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, two dogs mounted on said carrier to be movable each in a direction parallel with the rack, and manually-adjustable means for permitting and for preventing motion of each dog in the direction of and while engaged with the rack whereby the letterspace feed maybe caused to take place at different times with relation to the time of impact of the type according to the adjustment.

21. In a type-writing machine and in an escapement mechanism, the combination of type-operating keys, a platen, a carriage, an escapement mechanism having no fixed stop for arresting the toand-fro movable elements thereof on the depression of a key and comprising a rack, a dog-carrier, a dog normally engaged with the rack, a-dog normally disengaged from the rack and movable independently, stop means having a member connected to the second-named dog and adapted to hold the same in engagement with the rack in a position relatively fixed as regards the rack, and a spring for said second-named dog and the connected stop member whereby the key depressed and the to-and-fro moving element of the escapement mechanism meet with a gradually-increasing resistance after a certain amount of motion of the element.

22. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog normally engaged with the rack, a plate 51, a dog 65 on said plate, an arm &8 pivoted to the carrier on an axis at right angles to the rack and connected with the plate 51 by an axis parallel with the holding said arm against one of said stops, a

rack, .a spring 55 for said plate51, a spring for the arm 48, and stops for limiting the motion of said arm 48 and the parts carried thereby.

23. In a type-writing machine, and in an escapement mechanism, the combination of a rack, a'pivoted dog-carrier, a dog thereon normally engaged with the rack, an arm pivoted to said carrier on an axis at right angles to that of thecarrier, stops for limiting the motion of said arm, a spring for normally plate 51 pivoted to said arm upon an axis parallel with the axis of the carrier, a dog on said plate 51 normally disengaged from the rack, a spring for said plate 51 pressing it and its dog toward the rack, and an adjustable stop 53 on said plate and coacting with the carrier.

24. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog 39 pivoted on said carrier and normally in engagement with the rack and against a stop on said carrier, a spring, means for adjusting said spring so as to press said dog against or away from the said stop, an arm 48 pivotally connected with said carrier by an axis at right angles to the rack, a stop-plate 51 pivotally connected with said arm by an axis parallel with the rack and provided with a dog normally disengaged from the rack, stops for limiting the motion of the arm 48 on its axis and one adjustable for locking said arm against motion, and springs for said arm 48 and plate 51.

25. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog-carrier, a dog 39 pivoted on said carrier and normallyin engagement with the rack and against a stop on said carrier, a spring, means for adjusting said spring so as to press said dog against or away from said stop, an arm 48 pivotally connected with said carrier by an axis at right angles to the rack, a stop-plate 51 pivotally connected with said arm by an axis parallel with the rack and provided with a dog 65 normally disengaged from the rack, stops for limiting the motion of the arm 48 on its axis and one adjustable for locking said arm against motion, an adjustable stop 53 on the plate 5l'and engaging with the carrier, and springs for said arm 48 and plate 51.

' 26. In a type-writing machine andin an escapement mechanism, the combination of a rack, a dog-rocker, a dog arranged thereon and normally engaging the said rack, and a second dog arranged thereon and springpressed toward the rack and provided with a part distinct from the dog itself constructed to be arrested by a relatively-fixed member distinct from the bottom of the rack-tooth space, whereby the key-action is cushioned and a quick return of the dog is effected.

27. In a type-writing machine and in an escapement mechanism, the combinationof a rack, a dog, as 65, normally disengaged from the rack, means for enabling the dog to act for either ordinary feed or reverse feed, a cushioning device for said dog operative in either case, and a second dog, as 39, normally engaging the rack, and constructed for cooperation with the first-men tioned dog in both the ordinary and reverse feed movements.

28. In a type-writing machine and in an escapement mechanism, the combination of a rack, a dog normally disengaged therefrom and springpressed toward said rack, whereby the dog is adapted to yield, when engaged with the rack, upon a continued depression of the key, so as to cushion the key-action and effect a quick return of the dog to normal position 'upon the release of the key, means for enabling the dog to act for either ordinary or reverse feed, and a second dog, as 39, constructed for cooperation with the first-mentioned dog in both the ordinary and reverse feed movements.

29. In a type-writing machine and in an escapement mechanism, the combination with a rack of a dog constructed to yield in one direction under pressure of the rack, and means for arresting the movement of the dog and causing it to yield in another direction during the downstroke of a key and before the termination thereof.

30. In a type-writing machine and in an es capement mechanism, the combination with a rack of a dog constructed to yield in one direction under pressure of the rack, during the downstroke of a key, arresting means for causing the dog to yield in another direction durin g such downstroke of the key and before the termination thereof. 7

31. In a type-writing machine and in an escapement mechanism, the combination with a rack of a dog constructed to yield in one direction under pressure of the rack, and arresting means for causing the dog to yield in another direction during the downstroke of a key and before the termination thereof, and springs for restoring the dog to its original position.

32. In atype-writing machine and in an es- WALTER J. BARRON.

Witnesses:

K. V. DONOVAN, A. C. VAN BLAROOM.

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