US945827A - Stereotype-plate-casting machine. - Google Patents

Description

J. J. WALSBR.

STEREOTYPE PLATE CASTING MACHINE.

APPLICATION FILED JAN. 9, 1909.

Patented Jan. 11, 1910.

6 SHEETS-SHEET 1.

Patented Jan. 11,1910.

6 SHEETS-SHEET 2.

APPLICATION FILED JAN. 9, 1909.

Patented Jan. 11, 1910.

6 SHEETS-SHEET 3.

J. J. WALSER.

STEREOTYPE PLATE CASTING MACHINE.

APPLICATION FILED JAN. 9, 1909.

Patented Jan. 11, 1910.

6 SHEETS-SHEET 5.

J. J. WALSBR. STEREOTYPE PLATE CASTING-'MAGHINE.

APPLICATION FILED JAN. 9, 1909.

945,827, Patented Jan. 11, 1910.

6 SHEBTFSHEBT 6.

s reens PATENT? onnion.

JOSEPH J'. WALSER, F GHICAGO, ILLINOIS, ASSIGNGR TO THE GOSS PRINTING PRESS COMPANY, 03 GHICAGQ, ILLINOIS, A CORPORATION OF ILLINOIS.

STEEEOTYEE-PLATE-CASTING TvIACHINE.

Specification of Letters Eetent.

Patented Jan. 111, $91G.

Application filed January 9, 1909. Serial No. 471,451.

To all whom it may co'rwem:

Be it known that l, JOSEPH J. WALSER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Stereotype-Plate- Cssting Machines, of which the following is s. specification, reference being had to the accompanying drawings.

My invention relates to stereotype-platecosting machines and particularly to a new end improved form ing curved stereotyped plates for rotary printing presses by which plates may be est Without risers or tails, thus doing away with the necessity for the use of teil-cutplate 10 and ing machinery.

lthes for s further obiect the providing 01 s. new end'improved form 'of such costing-box which may be readily handled and easily operated by my new and improved mechanism by which the two parts may be brought together and by which they may be locked into position "for receiving the molten metal, and also provide new and improved mechanism by which the members of the box may be locked together, as above stated, and ,ot the some time moved into position to receive a charge from the melting-pot and by which the members may be sinuiltsneously moved away from the chargereceiving position and unlocked.

it has for a further object the improvementof such costing-box in sundry details hereinafter pointed out.

in the drswings,l igure 1 is e side elevation; Fig. 2 is an enlarged top or plan view of the casting-box proper; Fig. 3 is a vertical section on line 3-3 of Fig. 9 through the costing-box with the 111mb-5 in position; Fig. i is a section on line l-l of Fig. 3; Fig. 5 is a section on line of Fig. 8; Fig. 6 is an enlarged top or plan view of the drag or i'novsble member of the casting-box; Fig. 7 is a. plan view of the the plunger or fixed member uppenpsrt of of the casting-box; Fig. 8 is a section on Fig. 9 18 a section on line 8-8 of Fig. 1;

'line 99 of Fig. 8; Fig. 10 is a section on line l0-i0 of Fig. 8; Fig. 11 is an enlarged detail, being 2. vertical section of a part of the upper end of a casting-box in casting position and showing the severing-knife; Fig. 12 is a view of a. portion of the top of the of costing-box for castfixed member or plunger seen from its,

The rocks 23 and rack-bars 2st are so curved side; l*ig. 13 is an enlarged detail,

being a view of a part of the lower portion being an insometric view of the cuttingknife.

Referring to the drawings,l5 is the bedplate of the machine.

16 indlca-tes a base member, on which the ports hereinafter described are mounted, and which is slidingly mounted by means of rollers 17 which, extending across the machine from side to side and operating in slots 19-20 formed respectively in the bedbase 16, permit the base 16 with the parts carried thereon to move 2 limited distance longitudinally of itself upon the bed 15.

21 indicates guide-plates which may be secured either to the bed or base 16 to hold the partslaterally in place.

22 indicates the drag or movable member of the csstingbox which carries the matrix, as hereinafter described.

23 indicates racks, which are secured to the sides of the drag and which engage rackbars 24 mounted in acurve upon supports 25 secured to the base plate or member 16.

26 indicates sockets on the drug 22 which are adapted when the parts are moved into position to engage the circular ends 27 of bars 28 in the manner hereinafter described. formed that when the movable member is rocked into a vertical position the sockets will be brought upon the circular. heads .2? so as to engage the some.

29 indicates a support mounted at the outer end of the base 16 and adopted to support the outer end of the drag when the drag is in horizontal position.

3G indicates e fixed-member or plunger which, as is best shown in Fig. 9, is provided svith tongues 31. which are slidingly mounted in corresponding grooves in the base plate so as topermit a slight forward and beclrwari'l movement of the plunger independent of the drag. The plunger, as is best shown in Fig; 10, is secured to the bed-plate by bolts 32 which pass through a suitably-slotted lug 33 on the plunger, the plunger being olso pro vided with a slot 34: overlying the squared rod 28 and sufficiently Wider than this rod to -3536 projecting a suitable distance respectively downward from the upper end and upward from the lower end and extending across the plunger from back to back so as to permit the placin within the plunger of a tube 37 from which cold water may be supplied from any suitable source.

38 indicates a cross-pipe closed at its ends and secured by a suitable T-joint to the cold-water pipe 37 and provided with a series of openings 39 upon the side adjacent to the back of the curved surface of the plunger by means of which water may be sprayed against the plunger near its up er end and flowing down the sides will ow out by means of a discharge pipe 40 screwed into the bottom of the plunger through the flange 36. The front surface of the plunger is convex and semi-cylindrical in section, as is usual with this type of casting-box. The inner surface of the drag also, of course, is concave and semi-cylindrical in section to conform to the convex outer surface'of the plunger, so that when they are brought into casting position a curved stereotype plate may be cast between them, as hereinafter described.

41 indicates a rock-shaft, which is mounted in suitable brackets 42 on the back of the plunger and is operated by a hand-lever 43. 4:4 indicates a bracket secured to said rockshaft, one near each end, and provided with inward-projecting cam shoulders 45 which are adapted to engage rollers 16 on the drag 22 located one upon each side and nearthe outer end thereof when the drag is rocked into casting position. The upper end of the plunger 30 is rovided with an expanding solid portion l whose inner surface slopes upward and backward and which solid portion is pierced by a curved opening 48 which extends downward and outward and opens at its lower end through the convex outer surface or the plunger at a point registering with the top of the plate when cast. The shape of this opening 48 and its opening 'out through the surface of the plunger are best shown respectively in Fi 7 and 12, where it is shown particular in dotted lines in Fig. 7 and in solid lines in Fig. 12.

49 indicates a funnel, which is shaped to correspond with and fit snu ly in the opening 48 but so as to permit t e easy removal of the funnel. The upper end of the funnel is expanded, as is best shown in Fig. 3, and is provided with a handle 50 by which it may be removed.

51 indicates the-discharge-spout from any suitable melting furnace (not shown) by means of which the molten type metal may be run into the tunnel 49 and so located with eeasev reference to the casting-box. that when the parts are moved into casting position, as hereinafter described, the discharge end of the tube will register with the upper end of the funnel 4C9.

52 indicates lugs, which are bolted,. or otherwise secured, to the upper end of the funnel 49 and project backward over the rear of the plunger.

53 indicates rods, which are slidingly mounted in brackets 54 on the rear of the plunger 30 and whose upper ends, as at 53, are bent so as to register with. and engage the lugs 52. The lower ends of the rods 53 are provided with projections 55 which are adapted to be engaged by cams 56 on the rock-shatt 41 so that when the rock-shaft is rocked into the position shown in dotted lines in Fig. 1 the cams will be disengaged from the sliding rods 53 permitting the same to move to their lowest position, and therefor the funnel d9 will be lowered into the position best'shown in Fig. 3. When the rock-shaft, however, is rocked in the posi tion shown in solid lines in Fig. 1, the cam 56 engages the rods 53 and moves them slightly upward, thus slightly lifting the funnel out of position so that it may be readily removed.

57 indicates a link, which is pivotally connected at its upper end to thelever 43 and at its ower end to an arm 58 on a rock-shaft 59 which is journaled in suitable bearings at the casting-box end of the base 16.

60 indicates arms secured to the rockshaft 59 and provided each with slots 61 which engage pins 62 which are fixed in and project outward from the sides ofthe bedplate 15 at its ends.

63 indicates cams, which are secured to the rock-shaft 59 and are provided upon their exterior surfaces with cam grooves 641, the upper portion of which for a suitable distance is the arc of a circle concentric with the center of the rock-shaft and the remaining portion of which constitutes a cam groove swinging out very slightly from the circle and terminating in a straight portion 64 The cam grooves 64: engage each with a roller 65 which are j ournaled on the inner surfaces of the blocks 33.

The parts being in the position shown in solid lines in Fig. 3, it will be obvious that when the lever 13 is swung upward and backward in the position shown in dotted lines in Fig. 1 the rock-shaft 59 will be rocked and by the action of the pins 62 in the slots 61 on the arms 60 the entire baseplate 16 will be moved to the right in Fig. 1 carrying with it the drag and plunger mounted thereon into the position in whlch the plunger is shown in dotted lines in said Fig. 1, bringing the upper end of the funnel 4-9 under the discharge-spout 51. It the drag 22 has been rocked intocasting posistr ss? lion before this movement has been made the cam 45 at about the ends of the movement of the lever engaging the roller 46 willlock the upper end of the drag tightly into position against the plunger. At the same time the cam portion of the grooves 64 engaging the rollers 65 will force the plunger 30 slightly toward the drag by means of its slotted mounting above described; and the lower end of the drag being engaged by means of the sockets :26 on the fixed bearing 27, the drag and plunger will be forced together at their lower ends so as to brin them into tight engagement with one another and prevent the leakage of the metal when'poured through the funnel into the casting chamber formed between the two parts of the casting-box. When the lever is rocked back into its original position this movement will be reversed, the drag and plunger slightly moved from each other by the operation of the cams and by the same movement of the lever the base moved forward again upon the bed-plate into its original position and moving the funnel away from the discharge spout so that it can be readily removed.

66 indicates curved plates which are mounted upon the side of the casting-box with their ends resting on a shoulder 67, the upper portion above the .metnl opening e8 being cut away so as to be of suitably less diameter than the casting portion of the plunger. as is best shown in Figs. 3 and 12.

68 indicates a circumferential shoulder on the upper portion of the plunger above the discharge orifice d8, above which the upper portion of the plunger so as to form the said shoulder 68. The curved plates 66 are recessed, as is best shown in Fig. 12, to engage the said shoulder. There is thus formed a curved bearing surface 69 above the discharge opening 48 and between the ends of the curved plates upon which the slice-bar hereinafter described bears.

70 indicates a slice-bar curved to conform to the bearing surface 69 and of such length as to hear at each end againstthe inner ends of the curved plates 66. The slice-bar is provided on its inner surface with a circumferential shoulder 71 which; when the slicebar in its lowest position, engages and rests upon the shoulder 68.

72 indicates lugs on the upper surface of the slice-bar 70. I

Referring to Fig. 2, 73-7 l-75 indicate roclr -shafts, which are journaled respectively, in bearings 76, 77 and 78 secured to the top ofthe plunger 80. The rock-shafts 74: and 75 are connected-at their inner ends by universal joints *4'9 with the opposite ends of the rock-shafts 73 so that when the rock-shaft T3 is turned the rock-shafts i iand may turn with it. 'lheroclr-shaft Z3 is turned by is made still smallermeans of a handle 80 which is secured thereto. 81 indicates an eccentric on the shaft 73. 82 indicates an eccentric rod whose lower end is pivotally engaged with the central lug 72 on the slice-bar 70 and whose upper end is provided with an eccentric strap 83 engaging the eccentric 81. 84 indicate similar eccentric straps on the ends of corresponding links of which only one, 85, is shown in Fig. 1, and whichengage with the outer lug 72 on the slice-bar 70. Eccentrics exactly like eccentric 81 are mounted on the rocloshafts 7 1 and 75 to engage the eccentric bearings 8 1-85. As these eccentrics are exactly like the eccentric above described they are not shown for the sake of preventing confusion in the drawings. When the hand-lever 80 is moved it will be obvious that three rockshafts are rocked with it, and by the medium of the eccentric and eccentric rods the slicebar is raised or lowered. T he slice-bar operates notonly as a slice-bar but as a valve. It is so arranged that when it is raised it opens the passage -18 permit-ting the metal to flow into the casting space between the drag and the lunger. When the slice-bar is lowered into t e posit-ion shown in Fig. 11, it

separates the metal close to the cast plate and at the same time closes the discharge opening. The length of the slice-bar is. of course, such as to completely cover the opening at the bottom of the funnel.

Coming now to the details of the drag or movable member, this as has been said, has its inner surface curved in the arc of a circle to the form of the desired plate and is adapted to support the usual matrix 86 (Fig. That portion ofthe drag or movable member within which the cast plate is formed is provided with a hollow backing 87 (see Figs. 3 and 4) which extends over a suitably greater space than is occupied by the cast plate and is adapted tohave water pass through it from any suitable source by means of a supply-pipe 88 (Fig. l). 89 indicates a head-gage, which is curved to conform to the interior surface of the plate and is provided at each end with handles 90 (see Fig. 1} by means of which it may be put into or removed from the drag. it is held in place in the drag by means of pins 91 which enter suitable slots therefor on the edges of the drag and by a pin 91'' in the center of the convex surface of the drag which enters a suitable opening in the head-gage 89, and is placed in or removed from position by the handles 90. The under surface of the headgage 89 is suitably beveled to form the beveled side of the plate. and the head-gage is located immediately above the opening through which the metal passes into the mold. indicates shallow grooves in the concave surface of the which at their lower ends extend sufilciently downward to meet the end of the matrix 86 and at their upper ends extend a suitable distance above the head-gage 8 9 so as to permit the escape of the air from behind the matrix While the metal is being poured in. The convex surface of the head-gage is cut away for a suitable distance to form a periphery 93 (see Fig. 11) of a thickness equal to the thickness ofthe matrix so as to assist in holding the matrix in position. 94 indicates a foot-gage which forms the boundary of the other edge of the plate and is curved to correspond to the concave surface of the drag and is held therein by pins 95 adapted to enter suitable slots 95 in the concave surface of the cylinder and is provided with handles 96 by means of which it may be placed in position in the same Way as the head-gage 89. Its upper surface is beveled to correspond with the beveled plate, and the convex surface is provided with a peripheral shoulder 97 adapted to overlie the lower edge of the matrix. In order to increase the width of the plate, the foot-gage 94 is adjustable in the cylinder. To that end it is provided with a downward. projection 94; provided at its lower end with a slot 94 which rests when in its upper position upon a pin 98 in the longitudinal center of the curved surface of the drag. It is also provided with an opening 94. which is adapted when lowered to engage the same pin, and upon the edges of the drag are corresponding slots 98 into which the pins 95 may rest to hold the bottom' gage in position. I have shown the device as capable of only one adjustment, but, of course, more may be made if desired. 99-100 indicate side gages which, as is best shown in Fig. 4, are 11in ed upon the edges of the drag by means 0 suitable bearings 101102 secured to the sides of the plate. 103104 indicate handles which are secured to the side gages 99-100, by means of which they may be turned on the hinges and rocked out of the way. The side gages are each provided 11 on their surface adjacent to the convex sur ace of the mold with a suitable rabbeted recess-105 of a depth equal to that of the matrix and which assist in holding it in place. The interior edges of the side gages which form the side edges of the mold when the said side gages are in the position shown in Fig. 4 abut upon suitable shoulders, as 89 and 94 (see Figs. 6 and 13), upon the head and foot gages and hold them in position. The head and foot gages 89-94 and the side gages 99100 are of a thick ness corresponding with the thickness of the stereotype plate to be cast, so that when the two parts of the mold are brought together and locked tightly against one another in the manner above described, they form, the top, bottom and sides of the mold into which the plate is cast. The convex surface of the plunger is provided with the usual grooves 106 to form a series of shoulders on the concease? cave side of the plate in order to facilitate the shaving of the plate and made of any well-known form and description.

The opening 48 in the top portion of the plunger, in which the funnel 49 is inserted for the passage of the molten metal into the mold, has its discharge end so located that when the members of the casting box are locked together in casting position it opens into the top ofthe chamber in which the plate is cast, the lower edge of the top guide, as has been said, coming slightly below the top edge of the opening so that none of the plate when cast extends above the opening through which the metal runs into the casting chamber. As will be best seen in Figs. 3 and 11, the slice-bar has its convex surface so shaped that when it is loweredto sever the metal and separate the plate from the tail or riser left in the funnel the said convex surface forms a portio'n of the inner or convex side of the top of the casting chamber, the remainder of the same surface immediately below the head-gage being formed by the corresponding lower portions of the bars 66 between the side gages 99100. By means of this construction the metal is so severed by the slice-bar that no tail or riser is left attached to the plate, when the parts are separated, from the removal of the plate. As is best shown in Fig. 11, I preferably construct the slice-bar with a peripheral rabbet 70 on its convex surface at the lower end of such a height that the top of the rabbet will re ister with the inner concave edge of the head-gage 89 that is at the top of the bevel, as is best shown in Fig. 11. The

depth of this depression is preferably the same as that of the grooves 106 in the plunger so as to leave upon the under side of the plate at its top edge a peripheral shoulder of the same depth as those left by the grooves 106, which is trimmed off by the usual shaving apparatus in the same way as the other interior shoulders left on the plate.

When the metal is poured into the casting chamber and the plate formed, the air in the chamber will escape up through the metal andthe air behind the matrix expanded by the heat will escape through the grooves 93.

As the chamber is cooled by the water pipes above described the metal will readily set, and when the slice-bar 70 is lowered o1 erates as a knife to out through the c 111mg metal. The tail or riser left by the coole metal in "he funnel 49 is, as has been said, entirely evered from the plate so as to leave no tail or riser upon the plate itself. When the members of the casting box are separated and the drag thrown back into the horizontal position in the manner above described, the funnel {t9 will be partially lifted from the opening 48 in the top part of the plunger by the action of the cam 56' upon the sliding rods 53. At the same time,

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as has been above described, the entire casting mechanism will be moved forward, or to the left in Fig.1, moving the funnel out from under the discharge-spout 51. The funnel with its contained riser, partially lifted automatically b the movement of the parts as above described, can thereupon be readily lifted by its handles out of the opening in which it rests, the hardened metal contained thereby thrown back into the melting pot and the funnel replaced for the next casting operation.

That which I claim as my invention, desire to secure by Letters Patent, is,-.-

1. In a stereotype casting box, the combination with a bed and a base slidingly mounted on said bed, of .a drag and plunger carried by said base, and means for moving said base longitudinally backwardand forward on said bed.

2. The combination with a fixed bed and a base slidingly mounted thereon, of a stereotype late casting box mounted on said mova'b e base, a lever mounted on said stereotype casting box, and mechanism operated by said lever adapted to lock and unlock the members of said stereotype castin box and to move said movable base on said fixed bed.

3. The combination with a fixed bed and a base slidingly mounted thereon, of a stereot pe plate casting box mounted on said movab e base, a lever mounted on said stereotype casting box, mechanism operated by said lever adapted to lock and unlock the members of said stereotype casting box and move said movable base on said fixed bed, and means for cooling said casting box during the casting operation.

l. The combination with a fixed bed, a base mounted thereon and movable longitudinally thereof, a casting box for stereotype plates comprising a drag and plunger mounted on said movable base, of a lever mounted on said casting box, and mechanism connected with said lever and ada ted by the movement of the lever in one direction to move said movable base in one direction on said bed and to lock said drag and plunger together and by the movement of the lever in the other direction to move said movable base on saidbed in the other direction and unlock said drag and plunger.

5. The combination with a fixed bed, a base mounted thereon and movable longitudinally thereof, a casting box for stereotype plates comprising a drag and a plunger mounted on said movable base, of a lever mounted on said casting box, mechanism connected with said lever and 'ada ted by the movement of the lever in one irection to move said movable base in one direction on said bed and to lock said drag and plunger together and by the movement of the lever in the other direction to move said and movable base on'said bed in the other direction and unlock said drag and plunger, and means for cooling said casting box during the casting operation.

6. The combination with a drag and plunger adapted to be placed in operative relation with each other to' form a casting chamber for a stereotype plate between them, of a passage for metal in said plunger dischargin into said casting chamber, a slice-bar a apted to sever the cast plate from the riser, and means for removing the riser from said passage.

7. The combination with a drag and plunger adapted to be placed in operative relation with each other to form a casting chamber for a stereotype plate between them, of a passage for metal in said plunger discharging into the casting chamber, a funnel removably mounted in said opening in said plunger and adapted with its removal to remove the riser, and a slice-bar adapted to sever the cast plate from the riser.

8. The combination with a fixed plunger and a movable drag adapted to be moved into operative relation with said plunger to form a casting chamber for a stereotype plate between them, of a passage for metal in the upper part of said plunger opening at its discharge end into said casting chamber, mechanism for locking said drag and plunger together and for separating the same, a slice-bar adapted to sever the cast plate from the riser, and means 0 erated by said separating mechanism to li t the severed riser in said passage.

9. The combination with a fixed plunger and a movable drag adapted to be moved into operative relation with said plunger to form a casting chamber for a stereotype plate between them, of a passage for metal in the upper part of said plunger opening at its discharge end into the top of said eastin chamber, a removable funnel locatfid insai passage, mechanism for locking said drag and plun er together and for separating the same, and means operated by the said separating mechanism to lift said funnel with the contained riser.

10. The combination with a plunger and a movable drag adapted to be swung into operative relation with said plunger to form between them a casting chamber for a stereotype late, of a passage for metal in the top of sai lunger and dischar ing into said casting chamber, a slice-bar a apted to sever the cast plate from the riser, a removable funnel in said passa e, and means con- Ynected with said funne and operated by the separation of said drag and plunger to lift the said funnel and itscontained riser in said passage.

11. The combination with a plunger and a movabld drag adapted to be swung into operative relation with said plunger to form betweerrthem a casting chamber for a stereotype plate, of a passage for metal in the top funnel in said passage, mechanism for locking said drag and plunger together to form sa1d casting chamber, mechanism for se arating said dra and plunger after t e casting of the p ate, and connections be tween said separating mechanism and said funnel adapted to raise said funnel in said passage when the saiddrag and plungerare separated.

12. The combination with a bed-plate, a base longitudinally movable thereon, a plunger on said base, a swinging drag mounted on saidbase and ada ted to be swung into operative relation with said plunger, of mechanism adapted when said base and plunger are brought into operative relation with each other to move said base longitudinally of said bed and lock the said drag and plunger together to form a casting chamber for a stereotype plate between them. 13. The combination with a bed-plate, a base longitudinally movablethereon, a plunger on said base, a: swinging drag mounted on said base and adapted to be swung into operative relation with said plunger, of mechanism adapted when said base and plunger are brought into operative relation with each other't-o move said base longitudinally of. said bed and lock the said drag and plunger together to form a casting chamber for a stereotype plate between them, said moving mechanism being adapted when moved in the opposite direction to unlock said dra and plun er and move said base longitudinally of said bed in the other direction.

14:. The combination with a bed, a base mounted on said bed and movable lon itudinally thereof a plunger carried on sai base, a swirging drag mounted on said base and adapt to be moved into operative relation with said plunger, of a lever mounted on said plunger, and mechanism operated by said lever and adapted when said lever is swung in one direction to move said base longitudinally of said bed and lock said drag and plunger toether and, when said lever is swung in t e other direction, to move said base on said bed in the other direction and unlock said drag and plunger.

15. The combination with a bed, a base carried on said bed and movable longitudinally thereon, a plunger mounted on saidbase and having a limited movement longitudinall thereof and a drag carried by said base an adapted to be swung into operative relation with said plunger, of a lever carried'by said plun er, a. cam connected with said lever and a apt/ed when said lever is swung in one direction to engage one end of aaaeer 'base lon itudinally of said bed, and a connection etween said rockshaft and the other end of said plun er adapted as said lever is swung to move t e lower end of said plunger against said drag.

16. The combination with a bed, a base carried on said bed and movable longitudinally thereon, a plunger mounted on said base and having a limited movement longitudinally thereof and a drag carried by said base and adapted to be swung into operative relation with said plunger, of a lever carried by said plunger, a cam connected with said lever and adapted when said lever is swung in one direction to engage one end of said drag and lock it against the plunger, a rockswung in the other direction to unlock said a drag and plunger and move said base in the opposite dlrectlon longitudinally of said bed.

17. The combination with a bed, a base carried on said bed and movable longitudinally thereon, a plunger mounted on said base and having a lim1ted movement longitudinally thereof and a drag carried by said base and adapted to be swung into operative relation with said plunger, of a lever carried by-said plunger, a cam connected with said lever and adapted when said lever is swun in one direction to engage one end of sai dra and lock it against the plunger, a rockshait journaled in said base and connected to said lever, a connection between said rockshaft and bed adapted when said lever is swung in one direction to move said. base longitudinally of said bed, and a connection between said rock shaft and the other end of said plunger adapted as said lever is swung to move the lower end of said plunger against said drag, said lever and its connections being also adapted when said lever is swung in the other direction to unlock said drag andplunger at the top and move said base in the opposite direction longitudinally of said bed and move the bottom of said plunger away from said drag.

JUSEPH J. WALSER.

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