US1318705A - Plamoorapii co - Google Patents

Description

L. SYKES.

PISTON ROD AND TOGGLE FOR MOTORS, PNEUMATIC DRILLS, AIR TOOLS, AND THE LIKE.

Patented 001; 14,1919.

3 SHEETSw-SHEEI' I.

APPLICATION FILED APR. 25, I9I9.

mvmroa M W4 ATTORNEY m: COLUMBIA PLANOGRANI cn.. WASHINGTON. 1). c.

L. SYKES.

PISTON ROD AND TOGGLE FOR MOTORS, PNEUMATIC DRILLS, AIR TOOLS, AND THE LIKE.

APPLICATION FILED APR. 25, I919.

Patented 0013. 14, 1919.

3 SHEETS-SHEET 2.

Nh In R m% M G m6 ATTORNEYS.

L. SYKES.

. PISTON ROD AND TOGGLE FOR MOTORS, PNEUMATIC DRILLS AIRTOOLS, AND THE LIKE.

APPLICATION FILED APR.25, 1919.

1 ,318,705. Patented Oct. 14,1919.

3 SHEETS-SHEET 3- ON LINE 7?, FIG-3.

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MQQHHH (9.

dew-LL SJ INVE/VTUI? BY I ATTORNEYS.

UNITED STATES PATENT OFFICE LEWIS SYKES, or CAMDEN, IIEV'RSJEQY, AssIGnoR, BY Dinner Ann ASSiGN- vrnn'rs, 'IO KELLER PNEUMATIC fIOOL COMPANY, or GRAND H VEN; MICHIGAN, A

CORPORATION OF MICHIGAN.

PISTON-ROD Ann 'roGGLE Eon Morons, PNEUMATIC paints, Am-roons, AND THE] To all whom it may conc rd:

Be it known that I, Lnu rstSYKns a citizen of the United States," residing in the city and county of Camden, State of New Jersey,

have invented anew and useful Piston-Rod and Toggle for; Motors, Pneumatic Drills, Air-Tools, and the like, ofvvhich the follow- 7 ing is a specification. f' '1 My invention relates generally a novel 10 construction of a pneumatic' d'ril-l, airtool or similar implement; and relates inoretpai ticularly to a' novel eonstructiomof a piston rod and means for uniting the ends of the piston 'rod With the insidea'nd -out'sid e tog gles'whi'ch oOaot with the crankshaftpthe. opposite endjof the piston "rod being'connected with the piston in a novel'and durable" manner. e

In the devices of the prior'artith which I' am very familiar, it has heretofore been the practice to employ a ball and socket connection between thepiston andithe con tiguous end'of the piston rod, While the? opposite end of the piston rod is secured in position by a hinged toggle, which inv practice I have found toibe an" unsatisfactory construction, since, thehinge pins shear and" the reduced section of metal surrounding said hinge pinsbreaks down, so that the entire strain is thrown upon the tapered end of the toggles and the binding nut,

\vhichconnects the two halves of the toggle. This binding nut has heretofore been made of steel, heat treated to a certain degreewitli a straight internal thread to engagethe male taper thread on'the end ofthe toggle. I I have found'that the "practice of-forc-ing this soft, straight threaded nut over the tapered en'dof the toggles, therebystretching the metal in the 'nut anywhere from l/Gi to '1/16 of an inch, is'objeotionable, since by the time this nutfis'only hailjfwayi home, the metal in the nfutis fatiguedbeyond' repair, and the mechanism referred'tjo will not in practice Withstand the continued wrecking force and 'vibration'to which it is subjected forlany'length of time; p I

Furthermore, in the structure of the prior art, the threaded split plan'ipinglnut, which isintended foralockIandelanip combined, instead of clamping the'piston'rod, has'a tendency to unseat the binding nut, already fatigued, and allows the piston rod tofbesome loose and-the intermittent impulses specification of Letters latent.

retested oct. 14, 1919.,

diameter of the piston rodf is red'uc'edito allow the ball to rotate the ball socket far enough to Sllitthe throw of the crank, and in some'instances, I have found that the ball becomes" disengaged from the socket and the effective-operation of the drill is consequently impaired.

'To remedy the foregoing ot ectina ie features, I have devised-a novelbons truct'ion" of piston'rod, which is providedvvitli a T-' head atone end and a reduced tapered neck and an outer head at the other end,'the

entire outerjare'a' of said. latter head taking up the thrust of the entire rod in both the inside and outside toggles, whereby the pistoni rod is prevented from Wear'land the eX- tremity of said outer head has aneccentric pin, which interlocks with a seat'in the co acting toggle member, whereby-the piston rod is prevented from improper rotation.

'I'n my present invention, connect'the piston end of the rod to the piston, in lieu of the objectionableball an'd'socket connection'referred to, by means of a T end conneetion rotating on a hardened steel pin are Welded into a suitable support, made from a'punched and pierced blank, bent to shape, said support being assembled and spot-Welded or riveted upon the inner face or bottom of the piston, the swing of the piston rod being limited only by the diameter of the boreof the pistongf A In lieuofthe objectionablebinding nut and threaded split clainping'nut heretofore referredto, I employ inplace of the'soft, straight, internally threaded nut ofthe prior art referred to, aireinforced, hardened, internally straight-threaded nut; which has elongatedwallsandra taper seat or cavity therein, the alls of hich -seatdiverge out- Wafiidly so as to engage the correspondingly contiguous tapered walls of the toggle 'memts; 3? nq' eili hintli e e tfbe ei $1611 form and dimension that when' it is rotated upon thethreaded portion of the onnecting rod,"thecoacting surface ofits" inner tapered walls will tighten and snugly engage with the tapered extension of the toggle members so that considerable force can be exerted in tightening up these parts without dam age or undue stretching of the metal which is also very important in this connection and in addition my novel binding nut when prop erly tightened with respect to the piston rod and coacting toggle members will not tend to work loose even under the excessive vibration, jar and abuse to' which tools of this character are, as is well known, subjected.

In the foregoing novel construction of piston rod, together with its manner of attachment to thepiston and to the inside and outside toggles, I have devised a construction wherein the binding nut will not work loose and the piston rod is locked against rotation with respect to its coacting toggle and which will be found to be very rigid and durable for the purpose intended and which will withstand the hard usage to which implements of this character are subjected in shipyards, boiler plants, structural ironworks and the like, since the operators of these implements are very frequently unskilled workmen, and it is important in order that the maximum amount of work be accomplished with air tools of this general character, that the same be constructed in a durable and efficient manner, particularly the connections common to the piston, piston rod and inner and outer toggles to which my present invention particularly relates.

For the purpose of illustrating my invention, I have shown in the accompanying drawings certain forms thereof which are at present preferred by me, since the same will give in practice satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the'precise-arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents a vertical, sectional view of an air tool or pneumatic drill, embodying my invention, showing particularly my novel construction of piston rod, inside and outside toggles, and the manner of securing the T-end of the piston rod to the piston.

Fig. 2 represents, on an enlarged scale, a plan view, the piston and T-head being shown in section, and the inside and outside toggles in elevation.

Fig. 3 represents a side elevation of Fig.

52, the piston and binding nut being shown in section and the toggles in side elevation. Fig. 4 represents a planview, partly in section, of my novel construction ofg'pist-on rod. 4 g

Fig. 5 represents a plan view of ablank from which the connection for securing the piston rod to the piston is formed.

Fig. 6'represents a connecting plate common to the T-end of the piston rod and piston, the same being struck up from the blank seen in Fig. 5.

' Fig. 7 represents a section on line 77 Fig. 8 represents a perspective view of the inside toggles in detached position.

Fig. 9 represents a perspective view of the outside toggles in detached position.

F ig. 10 represents a perspective view of the valve actuating eccentric employed, and

Fig. 11 represents a perspective view of the upper portion of the crank shaft coacting with said eccentric.

Similar numerals of reference indicate corresponding parts.

Referring to the drawings. In the pneumatic drill or air tool 1 or similar implement to which my invention is applicable, I have illustrated one standard type of drill, in which 2 designates the casing, 3 the piston cylinders having the pistons 4: therein, 5 the crank shaft having its lowerportions provided with the bearings 6 and 7, and its upper journal 8 provided with the bearings 9.

l0 and 11 designate gearing whereby power is transmitted to the spindle 12 for actuating a drilling, reaming or other tool. 13 designates the valve actuating eccentric having the broached hole 14 therein, which isdriven by the parallel flat or driving faces 14* on the upper end 15 of the crank shaft 5, said eccentric being detachable in a vertical direction from said driving faces and actuating the eccentric strap 16, which is connected to the pin 17 of the valve 18.

With the exception of the construction of the eccentric and its manner of actuation and connection with the coacting driving faces 14*, best seen in Figs. 1, 10 and 11, which form the subject-matter of a contemporaneously pending application filed by me, the above referred to elements are of standard construction and require no further descriptions, it being understood that the valve 18, controls through suitable ports and passages the admission and exhaust of the motive fluid to and from the pistons 4, the valve being actuated by the eccentric 13, and .the reciprocations of the pistons 4, effecting the rotation of the crank shaft 5, whereby power is transmitted by the gearing lOand 11 to the spindle 12 through the medium of the connecting rods and toggle, connections therefor which constitute the novel features of my present invention and'will now be described in detail after a brief reference to the prior art.

The inside and outside toggles in connection with the piston rod and piston of the prior art, are in practice too light and flimsy, the hinges being connected b'y hinge pins which shear and "in addition the reduced sectie'n .of metal ear qunding the hinge pins breaks down, whereby the entire strain is then thro wnonto "the taper threaded end of the toggles, and the binding nut, which connects the two halves of the toggle. This binding nut of the prior art is made of steel, heat-treated we certain degree with a practically straight internal thread, engage 'the male taper thread on the end of the toggle, and I have found that the practice of forcing thissoft, straight threaded nut over the taper threaded end of the toggles thereby stretching the metal in the nut anywhere from 1/64 to 1/16 very objectionable, since by the time the nut is only half way home, the metal" in the nut is fatigued beyond repair, and this mechanism will not in practice withstandthe continued wrecking force and vibration 'to which it is subjected. M In the case of the threaded split clamping nut of the prior art, which is intended' for a lock, and clamp combined,

' this part, "instead of checking the binding nut, and clampihg the piston rod has in practice a tendency to unseat the binding nut already fatigued, and allows the piston rod to become loose and the intermittent impulses of air against the face of the piston forces the rod back'and forth against a little shoulder whichis only.1/32 and which in a shorttimewea rs and for this reason is very unsatisfactory, I 7 I To obviate the foregoing objections, I have devised a novel construction; of a piston rod and a novel ma nnerof securing the end of saidfrod ,to the piston, the opposite end of said iston rod terminating in an eccentric pin which interlocks with a novel cease-met of inside and outside toggles, which features constitute my present invention and will now be described in detail.

19 designates my novel construction of piston rod, the same comprising the piston rod proper 20, having at itspiston end the enlarged head or T-end 21, having the transverse hole or bearing 22lther'ethrough, which rotates or oscillates on the hardened hollow steel pin '23. The ends '29 of said pin 23. are arcwelded into the holes 24 of a suitable support, as .the ears 25, which are struck up from'orintegral with the plate or body portion 26', seen in Figs. 5, 6 and 7.

In formin'gthe support for the :T end21 0'! the piston rod, take'a suitable circular blank, as'see'n in Fig; 5,;and form the cute 27 and the holes" 24 in the ends'25 therein, 7

pre ter'ably by a single operationfas' r V I V apparent to those skilled inthe art. The ears are then deflected at rightangles to the body 26 to formithe' construction seen in Figs. 1, 6 and 7, and the body portion 26 is either riveted to theinner face or bottom of the piston 1, as indicated at the points 23 in Fig. 7 or it may be spot-welded thereto, ii' desired.

By arc-welding the ends 29 of the 'pin'23 into the ears 25, as seen in Figs. 2, 3, and7, a veryjrigid and efiicient'unitary structure is produced when the parts are assembled, it being of course understood that the pin 23 is passed through the bearing 22 in the T- head'21 before its ends 29 are arc-welded.

The crank shaft end of the piston rod 20 has the reduced tapered neck 30 terminating in the head 31, and special attention is called to the fact that the thrust is taken up by the entire 0nd area 32 of the piston rod in both the inside and outside toggles, in conjunction with the shoulders 33, as will be best understood from Fig. 1.

' The detailed construction of the toggle v members will be best understood from Figs. 2, 3,8 and 9, which will now be described.

34: designates theinside toggle, see Fig. 8, which is composed of the 1nen'1bers35 and 36, which carry the bearings 37 and 38 respectively, which engage the juxtaposed portions of the crank shaft 5, the member having the tongue 39 engaging and interlocking with the groove 40 of the member 36.

The extension 41 of the member 36 has a seat 42 therein to receive the head 31 of the piston rod 20, it being noted that the end area 32 of the piston rod 19 abuts against the wall 413, while the. neck 30 occupies the space 44 and the/piston rod proper the bore or space 15, the exterior wall ofthe latter being tapered as indicated at 4:6. The extension 47 of the upper toggle memberissimilarlv internally chambered or constructed, as already described, as will beunderstood from the right of Fig. 3, and terminates in the tapered member 48, so that the tapered portions 46 and 48 of the parts when as sembled as. seen, at the right of Fig. 3, are engaged by the binding nut 19, which is threaded upon thepiston rod and is'preferably a reinforced, hardened, tapered, internally threaded nut, which has the intornal conical. seat or tapered walls 50 extended long enough to form an elongated bearing for the tapered. extensions 4.6 and 48.

The binding nut 4L9 of. such form and dimension that considerable force can be exerted in tightening up the parts engaged thereby, without damage or undue stretch 7.

ing 'of the metal, which is a very advantageous feature in this connection. I

' 51 designates the outside toggleseenin Fig. 9,]which iscomposed' of the two man: bers' 52 and 53. The member 521has the curvedarmsbal, which have the internalconcave portions 55, which fit over, tl1e convex members 37 (see Fig. 8), and said arms terminate in the hooks having the inwardly ex tending walls 56, which when the parts are assembled engage and interlock with the bottom of the outwardly projecting terminal lips 57 of the lower arms 58, which have the interior concave portions 59, which engage the convex extensions 38. The tapered extension 60 of the member 53 has the recess 61 for the head 31 of its piston rod, the entire end area 32 of said head exerting a thrust on the wall 62, while the neck 30 occupies the space 63, and the piston rod proper is seated in the space or concavity 64-, the outer wall of which is tapered as at 65. The tapered extension 66 of the member is internally similarly constructed, as will be understood from Fig. 3, and is tapered as at 67, so that the parts when assembled are securely locked by the binding nut 49, as seen at the left of Fig. 2, the dowel pins 69 interlocking with the seats 68 in the member 60.

The members of the inside toggle 34 may be provided with a port or ports 70 for lubrication, and the pin 23 may also be provided with lubricating ports 71.

I desire to call especial attention to the fact that my novel binding nut 4:9 is threaded only at one exterior, as indicated at, 73, said threaded portion engaging the threaded portion 7 1 of the piston rod or connecting rod 19, and that by reason of the novel construction of the internal conical seat formed by the tapered walls 50, when said nut is forced upon the elongated taper or conical extensions of the contiguous toggle members, an exceedingly tight and efficient joint is formed between said nut and the contiguous toggle members, and by having said nut in threaded engagement with the piston rod, the parts when assembled as seen in Figs. 1, 2 and 3 will be effectively locked in assen1- bled position.

I also desire to call especial attention to the function of the eccentric locking pin 7 5 of the piston rod 19, which when the parts are assembled interlocks with either the seat 76 seen in Fig. 9 or the seat 77 seen in Fig. 8 of the appropriate toggle member, the object of said eccentric lockin pin being to prevent the piston rod and piston from improper rotation during the reciprocations of the motor.

It will be further apparent that when the T-head 21 of the piston rod is assembled upon its hardened steel pin, which I- make perferablyhollow for the purpose of lightness or lubrication, and the ends 29 of said pin have been arc-welded or acetylene welded and the plate 26 spot-welded or riveted to the piston 1-, as seen in Figs. 2 and 3, a very light, rigid and durable structure is produced wherein the liability of breakage and undue wear are reduced to a minimum.

If desired, I may employ on the ends of the hardened steel pin 23 the washers 7S seen in Figs. 2 and 3, which may be secured in position in any suitable manner.

By constructing the piston rod 20 with the enlarged T-head 21 at its piston end, I provide increased strength at the point where it is most needed, and by collocating the head 31 of the piston rod with the toggles, so that'its entire end area 32 abuts directly against the contiguous wall, as 13, of the inside toggles, and 62 of the outside toggles, it will be evident that the entire longitudinal thrust of each piston rod is correctly and effectively applied at the proper point of each of the toggles, and there will be no undue wear at the contiguous portions of the piston rods and toggles, as is the case in the prior art constructions I have heretofore referred to.

By making the tapered extensions 16, 418, 65 and 67 of the inside and outside toggle members, so that the same are of the form of a truncated cone when assembled, and by elongating the walls of the binding nuts 4:9 so as to obtain an elongated bearin between the contiguous surfaces of said binding nut and the toggle members, it will be seen that an ample bearing surface is formed to enable the binding nuts to frictionally engage the contiguous portions of the toggle members, so that there will be no liability of any wear or loosening action upon the binding nuts.

By making the inner bores of the eXten sions of both the inner and outer toggles to conform to the parts 33, 30, 31 and of the piston rod 20 (see Fig. 41), the toggle members when assembled with respect to their piston rods, interlock properly and effectively therewith.

By constructing the outer members of the outer toggles with the interlocked hooked members, best seen in Figs. 3 and 9, the eX- pense of drilling and inserting pins in the hinged ends of the priorv art devices above referred to, is entirely dispensed with, and in addition, the interlocked hooked lllQll'llJGlS strengthen and reinforce the outer terminals of the arms of the outside toggles at a point where they have heretofore been weakened, so that the toggle connections when assen'ibled, as seen in Figs. 1, 2 and 3, constitute a reliable and durable driving connection common to the crank shaft and the piston rods and their adjuncts. By making the binding nut 19 of a" thickened or reinforced hardened internally tapered construction, the same will possess the requisite strength, so that considerable strength can be exerted in tightening up the coacting parts, so that they will not be liable to become disconnected during the reciprocations of the piston and the rotation of. the crankshaft.

It will be Understood that in practice, two pairs of angularly disposed cylinders and pistons, and two pairs of the inside and outside toggles, are employed, whose structure and manner of assembling will be apparent from Figs. 1, 2, 8, 8 and 9.

v Vhile I h ave shown in w ies-as e Re lly ai1am Lr s: will be, understood that I do not' limit myself thereto, as the broad principles of my 111- vention are applicable to other types of motors and to any construction wherein a rigid and durable connection is required be-' tween the piston or motor, its piston rod and the coacting toggle elements-which engagev the crank shaft of a motor or the like where the pistons are of small size, and where it is essential that a rigid and durable connection be had intermediate the pistons and the crank shaft to eifectitherotation of the latter. 7

It will beclearly understood from Figs. 1, 2 and 3, that when the eccentric locking pin 75'is interlocked with its recessin its I appropriate toggle, that not only arethe piston rod and pistonprevented from 11nproper rotation, but,inj addition, when the binding nut 5119 is tightened up, there can be no rotation of the piston rod during and after such tightening of the binding nut,

whereby all the parts are positively anddurably retained in assembled operative condition. i

It will now be apparent that I have devised a novel and: useful construction of a piston rod and toggles-for motors, pneu matic drills, air tools and the like, which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and while I have, in the present instance, shown and described a preferred en'ibodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of'its advantages. v

Having thus described my invention, what Iclaim as new and desire to secure by Letters Patent, is

1. In a machine of thecharacter stated,

a piston rod having a portion intermediate its ends threaded and terminating in a longitudinally extending eccentric terminal locking pin, located out of a'linement with the longitudinal axis of said rod.

2. In a machine of the character stated, a piston rod having. a T headat one end with a hole therethrough, and an eccentric terminal locking pin at its other end.

3. In a machine of the character stated, a piston rod having a T head at, one end with a hole therethrough, a threaded por-' tion intermediate its ends, and an eccentric terminal locking pin at its other end.

4. In a machine of the character stated, a piston rod having a portion thereof intermediate its ends threaded, a reduced neck near one of its ends and a head at said latter end terminating in a longitudinally nal axis of said piston rod.

6. Asan improved article of manufacture, inside toggles having portions thereof interlocking when assembled and provided with smooth tapered extensions, which when assembled have. the form of a truncated cone, said toggles being provided with seats 42, ski and 45 and one of said toggles having a terminal recess/T7 adapted to receive an interlocking eccentric pin carried by a piston rod.

7. As an improved article of manufacture, the herein-described outside toggles having curved arms and interlocking hooked ends, dowel pins and seats common to said toggles, the latter having smooth tapered extensions which when assembled have the'form of a truncated cone, said toggles having the seats 61, 63 and 64 for the reception of the end of a' piston rod and one of said toggles having the recess '76 for the reception of an interlocking eccentric pin carried by a piston rod.

S. The combination of pistons, means for controlling the .reciprocations thereof, pis ion rods connected to said pistons and threaded at a point intermediate their ends, a crank shaft, toggles engaging said piston rods and carried by said crank shaft and provided with smooth tapered extensions, and a binding nut threaded upon each of said piston rods and provided with a, conical internal seat frictionally engaging said tas pered extensions. 7

9. In a machine of the character stated, the combination of pistons, means for controlling the reciprocations of said pistons, a crank shaft, piston rods piv'otally eon nectedto said pistons, toggles engaging said crank shaft, said toggles having tapered smooth extensions, interlocking devices commonllgo said piston rods and toggles for preventing improper rotation of said rods and pistons, and binding nuts each having one portion in threaded engagement with said piston rod and its opposite portion in frictional engagement with the tapered extensions of said toggles.

10. The combination of a pair. of pistons, means for controlling the reciprocations of said pistons, a pair of piston rods pivotally attached thereto and exteriorly threaded intermediate their ends, a. crank shaft, inside and outside toggles for said crank shaft, said piston rods having eccentric terminal members interlocking with recesses in said toggles, tapered extensions on said toggles, and binding nuts i threaded engagement with said piston rods and provided with conical seats engaging the tapered extensions of said toggles.

11. In a device of the character stated, the combination of pistons, means for controlling the reciprocations of said pistons, piston rods pivotally connected thereto, each of said piston rods having a portion thereof intermediate its ends threaded, a reduced neck near one of said ends, and ahead at said latter end terminating in a longitudinally extending locking pin, the latter being located out of alinement with the longitudinal axis of said rod, toggle members having tapered extensions and recessed for the reception of said locking pin, and binding nuts having tapered internal seats engaging said tapered extensions, said binding nuts being in threaded engagement with said piston rods.

12. In a device of the character stated, pistons, means for controlling the reciproca tions thereof, a crank shaft, toggles for the latter having sn'iooth tapered exterior extensions, piston rods common to said toggles and pistons, and binding nuts frictionally engaging said tapered extensions and in threaded engagement with said piston rods.

13. In a device of the character stated, pistons, means for controlling the reciprocations thereof, a crank shaft, toggles for the latter having smooth tapered exterior extensions, niston rods common to said toggles and pistons, and binding nuts frictionally engaging said tapered extensions and in threaded engagement with said piston rods, in combination with means for preventing rotation of said piston rods with respect to said toggles.

l i. In a. device of the character stated, pistons, means for controlling the reciprocations of said pistons, piston rods pivotally connected thereto, and having threaded portions intermediate their ends, outside toggles having recesses in their juxtaposed portions interlocked with said piston rods, said toggles having tapered smooth extensions, a

binding nut having a threaded portion engaging the threaded portion of its piston rod, the latter having an eccentric terminal locking pin engaging a recess in one of said toggle members, a crank shaft, inside toggles engaging said crank shaft and carrying said outside toggles, said inside toggles having their piston rod interlocked therewith and provided with smooth tapered extensions, and a bindino nut engaging the threaded portion of sald latter piston rod and having internal conical walls engaging said latter tapered extensions.

15. In a device of the character stated, a piston rod, toggle sections engaging one end of the piston rod, and means to prevent the rotation of the rod on its longitudinal axis including an element interlockin with one of said toggle sections and arranged eccentrically with relation to the piston rod.

16. In a device of the character stated, a piston rod, toggle sections engaging one end of the piston rod, one toggle section having a longitudinal recess formed therein, and an eccentric locking pin secured to the end of the piston rod and entering said longitudinal recess.

17. As an improved article of manufacture, inside toggles, provided With smooth tapered extensions, which when assembled have the form of a truncated cone and are adapted to be frictionally engaged by a binding nut, the juxtaposed portions of said toggles having seats therein which are adapted to be interlocked with the contiguous portion of a coacting piston rod.

18. As an improved article of manufacture, outside toggles having curved arms, outer interlocking hooked ends and smooth tapered extensions, which when assembled have the form of a truncated cone, and are adapted to be frictionally engaged by a binding nut, the juxtaposed portions of said toggles having seats therein adapted to be interlocked with the end of a coacting piston rod.

LEWIS SYKES.

lVitnesses J. V. MEEKER, M. A. KnnUssER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G."

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