US1231747A - Printing-press-controlling device. - Google Patents

Description

W. J. KRENTNER.

PRINTING PRESS CONTROLLING DEVICE.

APPLICATION FILED MAR. 22,1916- mmmm Patented July 3,1917.

5 SHEETSSHEET I.

W. J. KRENTNER.

PRINTING PRESS CONTROLLING DEVICE. APPLICATION FILED MAR. 22, I9I6.

Patented July 3, 191?.

5 SHEETS-SHEET 2.

W. J KRENTNER.

PRINTING PRESS CONTROLLING DEVICE.

APPLICATION FILED MAR. 22. 19I6.

1 1 $4? Patented July 3, 1917.

5 SHEETSSHEET 3- W. J. KRENTNER.

PRINTING PRESS CONTROLLING DEVICE. APPLICATION FILED MAR. 22. 1916.

Patented July 3, 1917.

5 SHEETSSHEET 4.

W. J. KRENTNER.

PRINTING PRESS CONTROLLING DEVICE.

APPLICATION FILED MAR. 22, I916.

1,231 34'? Patented July 3, 1917.

5 SHEETS-SHEET 5- NIIE %AT% ART lFllC.

IVALTER J. KRENTNER, OF CHICAGO, ILLINOIS.

PRINTING-PRESS-CONTROLLING DEVICE.

Application filed March 22, 1916.

To all whom it may concern Be it known that I, VVALTER J. KnnN'rNnn, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Printing-PressControlling Device; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

The purpose of this invention isto provide a mechanism adapted to form a part'of or to be attached upon a printing press to improve the press work and obtain a uniform color impression on every sheet of stock by insuring proper inking of the form,

areventin admission of an excess of ink thereto except where conditions so necessi tate, and insuring a positive and sufficient supply of ink thereto to prevent pale impressions. There are many unfavorable conditions of operation which contribute to unsatisfactory printing, such as poor stock with the edges torn or worn, sheets sticking together, scraps in the stock, static electricity in the stock, the hand or automatic feeder weak or unreliable. and poor delivery of the stock after an impression is made thereon. Any of the above conditions necessitates tripping the machine to elevate the impression roller away from the form, thus causing the form to be successively inked without impressions being taken therefrom, causing the form to fill up with ink, and subsequently, due to the excess ink, causing onset and otherwise poor impressions to be made on the stock which is otherwise good in all respects. My invention obviates trouble arising from any of the above conditions enumerated, and further insures a saving of large quantities of inkand stock.

Briefly stated, the control device acts to check the ductor roll of the press in its movement for contact with the fountain roll, and furthermore to raise the form ink rolls when the press is tripped, out of possible contact with the form or ink plate, and operating to permit 1nore than one rolling or inking of the form for each impression taken from the form, if so desired.

Itis an object therefore of this invent-ion to construct a controlling device for printing presses adapted to prevent an excess ink- Specification of Letters Patent.

' vented when the Patented July 3, 1917.. Serial No. 85,777.

ing of the form when and further provided with a means to permit an excess supply of ink to the form over that usually supplied for one rolling thereof in instances, as for example, when the form or ink plate has been washed.

Itis also an object of this invention to provide a control device for a printing press adapted for connection to the tripping mechanism of the pressv whereby successive ink rolling operations on the form are prepress is tripped, that is, so that no impressions are taken therefrom and with means capable of throwing the control device out of operation wherebythe press is enabled to operate in the usual manner, that is, as constructed without adaptation of my invention thereto.

It is also an object of this invention to construct a control device for attachment on the press is tripped,

a printing press operating to control the,

supply of ink to the form, whereby a uniform inking of the form for each impression taken therefrom is assured and impressions of a constant and uniform color are obtained.

It is furthermore an important object of this invention to provide a controlling device for a printing press which is constructed for adjustment into three positions, one wherein the device remains idle, permitting the printing press to operate in the usual and ordinary manner, another position whereby an additional supply of ink may be rolled upon the ink plate but not the form when conditions so necessitate, and a third position wherein the device is connected for automatic operation with the press, so that in the event of tripping the press the control will operate to cause movement of the different inking mechanisms into neutral or idle position, so that an excess quantity of ink is not rolled upon the form or ink plate when no impressions are to be taken there from.

It is finally an object of this invention to construct an improved type of controlling device for adaptation to'a printing press permitting a control of the ink supply to the form to be directly in the hands of the press operator, so that clean cut impressions of uniform color are at all times assured from the form. v

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

Fig. 5 is a detail section taken on line 55 of Fig. 3.

Fig. 6 is a detail section taken on line 66 of Fig. 3.

Fig. 7 is a fragmentary detail section taken on line 7-7 of Fig. 2.

Fig. 8 is a fragmentary side view of the rack which is attached to and moved with the form table.

Fig. 9 is a similar view of the opposite side thereof.

Fig. 10 is a detail section taken on line 1010 of Fig. 8.

Fig. 11 is a detail section taken on line 11-11 of Fig. 8.

Fig. 12 is a fragmentary detail section taken on line 12-12 of Fig. 3.

Fig. 13 is an enlarged detail side elevation of the form ink rolls.

Fig. 14 is a similar view of the support for said ink rolls, showing the same in section.

Fig. 15 is a fragmentary detail section on line 15-15 of Fig. 13.

Fig. 16 is a sectional detail taken on line 16-16 of Fig. 3.

Fig. 17 is a detail sectional view taken on line 17-17 of Fig. 3.

Fig. 18 is a fragmentary top plan view of a portion of the mechanism shown in,

Fig. 16.

Fig. 19 is a fragmentary enlarged detail view of the handle controlling lever shown in Fig. 1.

Fig. 20 is a sectional detail on line 2020 of Fig. 3.

Fig. 21 is a support.

As shown in the drawings:

The main frame of the machine consists of a base 1, having a plurality of integral uprights 2, which at their upper ends are integral with a table or bed frame 3, on which the form and inking plate are slidably mounted in a usual manner. Substantially at the middle of the bed frame 3, of the press, upright frame members 1, are provided on each side thereof within which are slidably mounted bearings 5, in which a large feed or impression roller 6, is journaled. The bearings 5, and the feed roll 6, are normally held elevated by. coiled comdetail of the form ink rolls pression springs 7, disposed around guide uprights 8, which extend down to the base 1, of the frame. J ournaled transversely of the base 1, beneath the roller 6, is'a shaft 9, having eccentrics thereon over which are journaled bearing members 10, which are connected by means of the uprights 8, to the bearing'members 5, so that when the eccentic shaft 9, is rotated, the roll 6, is moved downwardly against the compression of the springs 7, to move a sheet of stock disposed on said roll against the inked form in the bed frame 3, of the machine.

The tripping mechanism of the presswhereby rotation of the eccentric shaft 9, is prevented so as not to impel the impression long crank 13. Said crank 13, is secured upon a shaft lehwhich extends transversely I through the base 1, of the machine, and on V the opposite side thereof is provided with a curved guide link 15.

Also journaled transversely of the base 1, is a shaft 16, provided with a large driving gear 17, and on 1 the rear surface of which, as shown 1n dotted lines in Fig. 2, is a continuous cam recess 18.

Av short lever 19, is journaled on j the eccentric shaft 9, and provided with a.

roller adapted to move in the recess 18, and pivotally connected to the outer end of said 1 lever-19, is a curved lever 20, provided with 3 a roller at its end adapted to move in the recessed guide link 15. Said curved lever 20,

is also provided with a notch on its under,

side, and rigidly secured upon the eccentric shaft 9, is a collar having a projecting tooth or lug 21, normally engaged with the notch 1 in said curved lever 20, so that movements of the lever 19, causing movements of the lever 20, will in turn cause movement of the tooth 21, to oscillate the eccentric shaft 9. Trip f ping of the machine, which merely prevents lowering of the press roll 6, is effected by depressing the foot pedal 12, which, through the lever 11, and crank 13, rotates the shaft 14, to move the curved guide lever 15, outwardly to the left from the position shown in Fig. 2, whereupon when the swinging movements of the levers 19Vand 20, take 1 place the roller at the end of the lever 20, will roll outwardly in the shifted guide lever 15, so that thelever 20, will be moved out of engagement with the tooth 21, and'therefore will not impart an oscillating movement I to the eccentric shaft 9. This form of driving mechanism whereby the feed roll 6, is moved downwardly for an impression, is 1 merely a conventional type, as well as the means for the so-called tripping operation provlded for the purpose, and it is obvious that any well known mechanism for performing the purpose such as used in any press whatsoever may be utilized,

CAD

The idea of my invention is to control impressions are taken therefrom, and providing a means also for permitting more than a single inking or rolling operation to take place thereon when desired, as for instance in placing the machine in operation after the form or ink plate has been washed. The inking mechanisms are only illustrated in a conventional manner, and of course may be different for difierent types of presses.

For this purpose, at one end of the frame of the machine an ink basin or reservoir 22, is provided, within which a fountain roll is mounted on a shaft 23, and adapted to rotate therewith, the lower surface of the roll being submerged in the ink in the reservoir. A shaft 24, is journaled transversely of the frame of the machine, and has secured on one end thereof, as shown in detail in Fig. 12, a double crank comprising arms 25 and 26, the arm 25, affording a support for one end of a pivotally mounted ductor roller 27 which, when in lower position, contacts with the fountain roller on the shaft 23, of the ink reservoir, to receive a supply of ink therefrom. The other arm 26, of said crank has adjustably and pivotally connected therein a curved arm 28, which is secured to a long connecting rod 29, and with the other end of said connecting rod 29, pro vided with a yoke or fork 30, on one side of which is a roller 31, tracking in a cam groove 32, of the cam wheel 33, secured upon the shaft 16. Journaled upon the eccentric shaft 9, is a sector shaped cam or stop member 3a, a portion of the periphery of which, as clearly shown in Fig. 12, is of a less radius than the other, and said sector member is adapted to swing downwardly to contact with one of the forked ends of the yoke 30, to hold the same from sliding movement into its extreme inner position. When so holding the yoke, the sector shaped element is in the dotted line position shown in Fig. 12, and the ductor roller 27, is thereby held from movement into contact with the roller on the shaft 23. The hub of the sector member 3 1, is provided with a clutch jaw or dog 35, as shown in detail in Fig. 5, and a collar is rigidly secured upon the eccentric shaft 9, and provided with a clutch jaw or dog 36, so that the oscillating movement of the eccentric shaft 9, may, when the respective jaws 35 and 36, are in contact with one another, oscillate the sector member 3 1. However, means are provided for moving the sector member 34, upwardly into a position such that the dogs 35 and 36, are out of contact and the oscillations of the shaft 9, are not transmitted to the sector member, and thesector member will thereby not interfere with the sliding movement of the forked yoke 30.

For this purpose, a pin 37, is provided on one surface of the sector member 34, and engages in the slotted end of a lever or link 38, which is pivoted to the end of a short crank 39, secured upon a shaft 40, journaled horizontally and transversely at the base of the machine. The other end of said shaft 10, is shown in Fig. 1, and secured thereon is ashort crank 4E1, which is connected by means of a long upright member 42, to a crank arm l3, of a handle or actuating lever 44:, pivoted on a stud shaft 45 at the upper end of the frame member :1. A curved guard plate or bar 1-5 is mounted adjacent the handle lever 11, and has the three possible positions of the handle lever 14, designated by the numerals 123. Connected to be actuated sii'nultaneously with and by the shaft L0, due to adjustments of the handle 14, is an inclined or angled cam sector 46, journaled on the shaft 9, as shown in Figs. 3, 4, and 6, and provided with a dog 47, on, the hub thereof adapted to be contacted by a dog 48, of a collar secured rigidly upon said shaft, so that when said sector cam is in certain position with the dogs in contact with one another, the sector will be oscillated by the shaft similarly to the movement imparted to the sector 3 1, previously described.

For the purpose of shifting said sector cam a6, due to actuation of the shaft 40, a relatively long stud or pin 19, is provided on the rear surface of said sector cam, ex: tending outwardly therefrom parallel to the shaft 9, and pivotally engaged thereon is the slotted end of a lever or link 50, the other end of which is pivoted on a short crank 51, secured upon said shaft 10. The purpose of said sector cam 46, is to transfer a longitudinal movement to a rectangular bar or key 52, which is sidably mounted through a portion of the frame slightly above and parallel to the crank shaft 9, and notched 011 its under surface for engagement with the periphery of the sector 46.

As shown in Figs. 3 and 7, a long slidable rack bar 53, is disposed centrally and longitudinally above the base 1, of the frame, and is connected by means of uprights, one 5 1, of which is shown, rigidly to the slidable table on which the form and inking plates of the press are mounted. Extending transversely through the rack bar is a shaft 55, and mounted on one end thereof on one side of the rack bar is a pawl 56, and on the other end of said shaft on the other side of the rack bar is a disk 57, having a coiled tension spring 58. connected to an extension thereof and to a stationary pin in the rack bar, the purpose of said spring being to hold said pawl 56, in either one of its extreme positions beyond dead centerthereof,

sp shafts 7 a tated, the bearing nected and. the eccentricshaft 9, remains t 1.

Journaled on the end of the shaft 55, on which the pawl 56, is mounted, is a collar 59, having a projection 60, thereon, and a portion of said collar 59, is cut away to permit a certain lost motion thereof with respect to the pawl 56. A leaf spring 61, is mounted on .the surface of said pawl and bears upon a pin on said collar, acting to hold the same normally in one extreme position of its movement with respect to said pawl. A projection 62, is also provided upon the disk 57, projecting outwardly therefrom for a purpose hereinafter pointed out.

Mounted at one side of the rack bar 53,

rigidly upon the base of the press frame,

and rearwardly of the position of the key 52, is a Z-bracket 63, having pivotally mounted on its upper end a latch pawl 64, which normally projects into a position to engage the stop or projection 62, when the same is disposed in position for contact thereby, to swing the pawl from the posi tion shown in Fig. 3, to that shown in Fig. 8, and a coiled tension spring 65, is connected to the tail of said latch pawl 64, to hold the same normally in position for en gagement and yet permitting the stop 62, to track forwardly thereover by swinging said latch pawl against the stress of its spring. The pawl 56, when swung upwardly into the position shown in Fig. 17 is adapted to strike against a roller 66, mounted on a crank 67, which is secured rigidly on a shaft in a bearing member 68, on the base 1. Mounted upon the other end of the shaft on which the crank 67, is secured, is a crank 69, which has pivoted thereto a long link or lever 70, which is in turn pivoted to another crank 71, secured rigidly upon a transverse shaft 72, journaled across the base of the machine. Said shaft 72, at each of its ends is provided with a short crank 73, to each of which are pivotally connected upf wardly extending levers 7a.

The form inking rollers of the press are all denoted by the reference numerals 75, and are mounted transversely of the press in bearing brackets 76, provided on each side of the press, said bearing brackets being vertically movable so as to elevate the inking rolls away from the form and ink plate when so desired. As shown in Figs. 13 and 14:, each bearing bracket 7 6, normally rests upon the top surface of a frame member 3, and when elevated therefrom is guided by guide bolts 77, threaded into the frame member 3, through recesses provided therefor in the bearing brackets 76. The elevation of each of the bearing brackets 76, is effected by rotation of eccentric shafts 78, which are seated in registering recesses between the bearing brackets 76, and the frame member 3, as shown in Fi 14c, so that when said rebrackets 76, are elevated away from the frame. Said shafts 78, are simultaneously actuatable, and the shafts of each pair are connected by a connecting rod or lever 79, plvoted to cranks 80, secured upon the ends ire of each of the shafts 78. Also connected to each end of one of the shafts 78, of

each pair thereof is a crank 81, to which the upper ends of the upright levers 74, are

pivotally connected, whereby the rotational movement is imparted to'the respective shafts 78, from the shaft 72, for the purpose so i when elevated by the eccentric shafts 78.

The inking rollers for the ink plate which moves with the form to transfer mk to the form inking rolls 75, are mounted at one end of the machine and denoted by the reference numerals 82, and one thereof 1s p0s1- tioned to receive the d-uctor roll 27 moved into contact therewith after the same has i contacted with the roll within the reservoir 22 to transfer the ink thereto, whereby the ink is in turn transferred to the other of the rolls 82, and distributed over the ink plate when it slides therebeneath.

Pivotally mounted at one side of the machine are a pair of levers 83, each adapted to release one of two crank levers, having arms 84 and 85, which are pivoted on one of the bearing brackets 76. levers are of slightly different shape, but are Said crank V identical in operation, the purpose thereof being to elevate the two uppermost rolls 86, of the lnk rolls 75, out of contact with the others of the group, and said crank levers perform this function when the levers 83, are swung rearwardly to permit the arms 84, to swing downwardly by gravity. Each of the levers 83, is provided with a spring impelled safety latch arm 87, which hooks over the roller on the end of the crank arm 8%, to prevent'retraction' thereof out of engagement with the lever 83, when the bearmg brackets and ink rolls are elevated by the eccentric shafts 78.

The operation is as follows: When the machine is operating, that is,

when impressions are being taken from the pressed to move the stock which is held thereon into engagement with the form to receive an impresslon therefrom, said roller inked form, the feed or press roller 6, is debeing moved downwardly at periodic intervalsfor the purpose, rotating as the form slides therebeneath. In the event that the machine is tripped, that is, by the operator depressing the pedal 12, the guide lever 15, is swung outwardly and as a consequence the oscillating drive to the eccentric shaft9,

received from the cam gear 17, is disconrest with the press roller 6, in an elevated position. The hand lever 44, at this time is in its first position or that shown in Fig. 19, and when so disposed the position of the shaft 40, actuated thereby through the link 42, is such that the sector cam 34, is permitted to oscillate with the eccentric shaft 9, when the same oscillates, due to the fact that the dog 35, on said section cam rests against the dog' 36, on the collar rigid on the shaft 9, and the shaft 40, being in the position aforesaid, the link 38, is so disposed that the pin 37, of said sector 34, merely slides in the slotted end of the link 38. The shaft 9, however, when coming to rest, leaves the sector 34, in its lower or dotted line position shown in Fig. 12. As a. consequence, the inwardly moving fork or yoke 30, which is actuated due to its roller traveling in the cam recess 32, is prevented from moving inwardly its full amount and as a result the ductor roll 27, which is actuated through suitable linkage connections to said forked yoke 30, is held elevated away from the fountain roller on the shaft 23, that is, in the dotted line position shown in Fig. 12, and as a consequence no ink is transferred to the ink rolls 82. When the shaft 9, is at rest, due to the machine being tripped, the inclined sector cam element 46, thereon, shown clearly in Fig. 3, is in a position such that the key 52, is held thrust inwardly toward the rack bar 53. During the usual oscillating movements, ho=wever, of the shaft 9, the sector 46, oscillates therewith in the manner described with reference to the sector 34, due to the fact that the dog 47, on the sector 46, rests against the dog 48, on a collar rigid on the shaft 9, and the pin 49, on said sector 46, slides backward and forward in the slotted end of the lever 50, with out hindrance, thus periodically retracting the key 52.

However, as stated, when the shaft 9, is brought to rest due to a tripping operation, the key 52, is left in an inwardly thrust position, and as a consequence the rearward movement of the rack 53, causes said key 52, to strike the stop 60, on the pawl 56, which is on one side of said rack bar, throwing the pawl upwardly toits upward position, such as shown in Fig. 17, the spring 58, on the opposite side of the rack bar 53, as shown in Fig. 9, serving to hold said pawl in its up ward position beyond dead center. The pawl so disposed upon the rearwardly moving rack bar, is in a position to strike the roller shown in Fig. 17, on the end of the crank 67, as clearly shown in Fig. 3, thus rotating the same and with it the crank 69, thereby actuating the long link or lever 70, and through the crank 71, rotating the shaft The slight rotational movement imparted to the shaft 72, is transmitted through the cranks 73, and upright levers 74, tothe eccentric shafts 78, thereby elevating the roller bearing brackets 76, thus elevating the form inking rolls 75, away from possible contact with the form and ink plate. The return reciprocating or forward movement of the rack bar 53, causes the stop 62, on the opposite side of the rack bar from the pawl 56, to strike against the latch 64, thereby throwing the pawl 56, downwardly, in which position it is held by the spring 58. Each subsequent rearward reciprocating movement of the rack bar 53, causes the pawl 56, to be again thrown upwardly, so that in the sequence of operations, the inking rollers 7 5, are elevated away from possible contact with the ink plate and form at the proper intervals, when the machine is in tripped. condition. The result of the foregoing operation of the parts is that no ink is transferred to the rolls from the ink reservoir and no ink from the rolls to the inking plate and form when the machine has been tripped.

Assuming now, it is desired to permit the ductor roller 27 to transfer ink to the ink rollers 82, to ink the ink plate, as for instance after the same has been washed, and yet not permit the rollers 75, to move downwardly into a position to ink the form. The handle lever 44, is then moved into its second position, thus causing an adjustn'ient of the shaft 40, whereby the crank 39, thereon shifts the lever 38, rearwardly to elevate the sector 34, sufliciently such that the same cannot move downwardly by gravity an amount sufficient to check the entering movement of the fork member 30, thus permitting the ductor roller 27, to move into contact with the fountain roller on the shaft 23, and to effect a transfer of ink to the rolls 82. However, such adjustment of the shaft 40, does not cause sufficient movement of the link 50, through the crank 51, on said shaft 40, to move the sector cam 46, so that as a consequence the same remains in a position to hold the key 52, inwardly, and thereby operates the mechanism when the rack bar 53, oscillates to periodically elevate the inking rollers 7 5, out of possible contact with the form or ink plate of the machine.

Next assume that it is desired to also ink the form as well as the ink plate, as for i11- stance after the form has been washed, and no impressions are to be taken immediately therefrom, or, for example, to deepen the color of the impression to be taken from the form, then the hand lever 44, is moved into its third or extreme position. lVith the hand lever in this position the shaft 40, will be so adjusted that the link 38, will be moved rearwardly to hold the sector member 34, out of possible contact with the fork 30, so

that reciprocation of the ductor roll 27,

. adjustment of the shaft 40, will cause the slotted link 50, to be likewise moved rearwardly an amount to draw the sector member 46, upwardly to hold the key 52, re tracted, and as a consequence the pawl 56, on the rack bar will not be thrown upwardly to actuate the crank 67, to cause, through the link 70, cranks 71 and 7 3, and lever 74, the eccentric shafts 78, to be actuated, thereby allowing the ink rolls 75, to remain in normal inln'ng position. It is apparent therefore that with the hand lever 424:, in its third position and with the press tripped, ink will be transferred by the ductor roll 27 to the rolls 82, and by the rolls 82, and ink plate to the ink rolls 75, which will in turn apply the ink upon the form.

The entire operation of the machine may be summed up as follows: that is, under ordinary conditions when the machine is tripped to hold the feed roll 6, elevated, mechanisms operate to prevent transfer of ink by the ductor roll 27, to the rolls 82, and furthermore the rolls 75, are elevated away from possible contact with the form and ink plates, but either the ink plate or form,

or both the ink plate and form, may be inked by effecting first a transfer of ink only to the rolls 82, for the ink plate and secondly by permitting the rolls 75, to contact with the plate and form to receive ink from the plate and transfer the same to the form.

I am aware that various details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a printing press, a reservoir, a fountain roller, a ductor roller, ink transfer rollers, reciprocating inking and form plates, and form inking rollers, of controlling mechanism adapted, when in one position, and the press is tripped, to cut off the ink supply by breaking contact between said fountain and ductor rollers, and when in another position to permit the ink supply and the contact between the transfer rollers and the inking plate, but to break contact between the form inking rollers and the form plate.

2. In a printing tain roller, a ductor roller, ink transfer rollers, reciprocating inking and form plates, and form inking rollers, of controlling mechanism adapted, when in one position, and the press is tripped, to cut off the ink supply by breaking contact between said fountain and ductor rollers; when in another position to permit the ink supply and the contact between the transfer rollers and the inking plate, but to break contact between the form inking rollers and the form plate; and when in a third position to reestablish contact between said'form inking rollers and the form plate also.

press, a reservoir, a foun- 3. In a printing press, an oscillatable rack 1 bar, a pawl mounted on the rack bar, means operating to cause a shifting of said pawl when the press is tripped, mechanism operated by the shifted pawl to move the ink rolls of the press out of inking position, and mechanism acting periodically to shift said pawl shifting means out of shifting position during the reciprocating movements of the rack bar when the press is operating under normal conditions. a

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

WALTER J. KRENTNER. lVitnesses: V

CHARLEsW. HILLs, Jr., EARL M. I-IARDINE.

Copies of this patent may be obtained for five cents each, by adfiressing' the Commissioner of Patents. Washington, D. C.

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