US314250A - kirby - Google Patents

Description

9 SheetsSheet 1.

(No Model.)

J. KIRBY, Jr.

LAMP.

Patented Mar. 24, 1885.

Witnesses:

inventor: fl 7 N. PETERS Phoxo-Lixhn mphor. Wnshinglom D. (L

(No Model.) I 9 Sheets-Sheet 2.

J. KIRBY. J-r.

LAMP.

N. PETERS. Pmla-uxm m vwr, washm mn, D. cv

(No Model.) 9 Sheets-Sheet a.

J. KIRBY, Jr.

I LAMP. N0. 314,250. Patented Mar. 24, 1885.

Inventor: I

a. PETERS. PlwlQLlfllogmplmr. Wnshi n nnnnnn c.

(No Model.) 9 Sheets-Sheet 5. J. KIRBY, Jr.

LAMP

No. 314,250. Patented Mar. 24, 1885.

Inventor; Kw

A y L 3 e a c S S s V C C 1 n M I .l k c A N. PETERS. Phuwulhn m her. Wahingon. n. C.

(No Model.) 9 Sheets-Sheet 7.

J. KIRBY, Jr.

LAMP.

No. 314,250. Patented Mar. 24, 1885.

(No Model.)

J. KIRBY, Jr. 9 Sheets Sheet 9.

LAMB. No. 314,250. Patented Mar. 24, 1885.

FIG-3I Jaw i 2% I M/z/w O N. PETiRS. Phclo-Ulhngraphen Wanhingmn. 0.5.

Unwrap STATES Farmer Onrrcn.

JOHN KIRBY, JR, OF DAYTON, OHIO, ASSIGNOR TO THE DAYTON MANU- FACTURING COMPANY, OF SAME PLACE.

" LAMP.

SPECIFICATION forming part of Letters Patent No. 314,250, dated March 2 1-, 1835.

Application filed July 5, 1883. (No model.) I

T0 aZZ whom, it may concern.-

Be it known that I, JOHN KIRBY, Jr., of Dayton, Ohio, have invented a new and useful Improvement in'Lamps, of which the following is a full, clear, and exact specification,

reference being bad to the accompanying drawings,forming part ofthis specification, in which similar letters indicate'the same parts, and in which Figure 1 is a section through reservoir and cast ring A, showing (a) attachments of main support to the cast rings A and G and (b) the attachment of lamp proper and lifting-rod. Fig. 2 is a section through lamp, showing its attachments to lifting-rod A and to airconduit B; Fig. 8, plan of cast ring A and part of cast ring G, showing supportingd'eet m" and aireonduit. Fig. 4 is a sectional view of binding arm and hanger, showing attachments to brace-ring G and cast ring A. Fig. 5isa section of cast ring A at m as, Fig. 3. Fig. Gisa perspective view showing manner of attachment of conduit 13 to cast ring A. Fig. 7 is a section of brace-ring G at a m, Fig. 3. Fig. Sis a plan of conduit 13, showing how itscover 0 forms part of cast ring A. Fig. 9 is a section through conduit B, on line 00 as, Fig. 8, showing cast ring A, liftingrod A", and fastening-screw d in elevation. Fig. 10 is a perspective view of cover of conduit 13. Fig. 11 is a cross-section of cover 0 on line a0 a1", 10. Fig. 12 is a horizontal section in line 95 00 Fig. 2, showing cylindrical end of conduit B and vertical cylinders of lamp in position; also the cover 0, abutting against air-chan1- ber cylinder M. Fig. 18 is a section through conduit B on line a m Fig. 12, showing its cylindrical end air chamber cylinder-,lVLin elevation. Fig. 14 is a vertical section through valve and valve-seatin bottom of oilreservoir K, Fig. 1. Fig. 15 is a horizontal section on line 00 at, Fig. 14. Fig. 16 is a plan of lower side of ring u, Fig. 14, showing under side of valveseat. Fig. 17 is a plan of rubber ring B. Fig. 18 is a crosssection of rubber ring B. Fig. 19 isa vertical section through side of oil-reservoir K, brace-ring G, and east ring A, showing lifting-rod A in position. Fig. 20 is a plan of notch in plate H, showing lug 00 on reservoir. Figs. 21, 22, and 23 are views of retaining device B. Fig. 24 is a plan of ring F. Fig. 25 is a perspective view of ring F, with its means of attachment of lifting-rod A. Fig.26 is a section through chimney-holder, burner-cap, burner-plate, burner-cylinders, and their coupling devices. Figs. 27 and 28 are perspective views of rings G and ll and cylinder M, coupledand uncoupled. Fig. 29 is a plan of hurricane-cap, showing divisionplates. Fig. 30 is an elevation of the lamp complete, one of the lamp-burners, with its shade, being elevated to permit the wick to be trimmed.- Fig. 81 shows the shade alone elevated to permit the removal of the chimney.

My invention relates to lamps, and more especially to lamps that are adapted to be be readily detached for filling without taking down any other part of the lamp. The lamp, further, is provided with means for raising the shadeholder without necessarily moving any other part of the lamp, and for raising the shade-holder, with the shade attached, the chimney-holder, and burner-cap together, if that be desired, as it may be in lighting the lamp or trimming the wick, without moving any otherpart of the lamp.

The construction of my lamp with these objects in view is as follows: To a cast ring, A, Figs. 1, 1, and 3, having the air-tube, arms B, bosses a a, furnished with internal screwthreads, the flanges Z) and c on its upper and near its upper edge, and turned out orcast with a recess, so that there shall he a flange, d, at its lower edge, a cylinder, D, which receives and forms an air-chamber around the lower end of the reservoir, is attached by securing, by solder or otherwise, its lower edge to the flange c. This cylinder D has the airopenings 6 6 immediately above its lower edge. To the inner side of the cylinder D, above the air-openings e e, is secured the plate f, open at the center. To a flange on the interior edge of platef is secured by solder or otherwise an oil-holder, E. The sides of the oil-holder E project above the plate f, and are turned or crimped over an elastic ring, (shown in the drawings, Figs. 17 and 18, as a rubber ring, R, having the flange 1-,) which they hold in place.

The function of the rubber ring is to prevent the overflow of oil out of the holder E when it is violently moved by the jolting of the cars.

The oil-holder E is at its bottom secured to plate h, furnished with an internal screwthread. A stem, is, screws into the plate 72, and is also furnished with an internal screwthread. An ornamental bottom piece, Z, fits into the recess or turned-out bottom edge of ring A at flange d, and its bottom is perforated to admit of the passage of the screw-piece m, which sets closely up to the bottom ofthe stem k. By means of the screw-piece m the ornamental bottom piece, Z, and the stem It, with its attachments, are firmly connected.

A cylinder, F, fitting inside of flange b of ring A, is secured at its upper edge to a cast brace-ring, G. It will be seen that there is an air-space, at, between the cylinders D and F, and that the cylinder D is of less diameter and less length than the cylinder F. I do not limit myself to any fixed relative length of cylinder D. The air to support the combustion of the lamp passes from the space a through the holes e e in the cylinder D, and then through the conduits B to the burners.

A plate, H, having air-openings h h and open at the center to admit of the entrance of an oil-reservoir, K, is secured to the bracering G at its upper edge. The outside edge of plate H is turned down to form a light flange which fits into ring G. If the upper edge of cylinder F is continued and firmly united to the plate H, to form a ring, the ring G may be dispensed with; but I prefer the construction with the ring G.- The object of the ring is to stiffen and strengthen the lamp, and it, with the ring A and the rods m, constitutes a rigid frame.

The oil-reservoir I use is made as follows: It is of the student-lamp type, and is ofa diameter somewhat less than the diameter of cylinder D, and consists of a cylinder, K, having a top plate, 1), raised at one place, p, to

make an airspace above the top of an airtube within the reservoir, and perforated in another place to admit the passage of an airtube, and having its side projected beyond the plate 19 to form a cap, 19 This cap p is perforated near the top for the admission of air. The reservoir K has an outside flange, q, near the top,"which flange rests upon plate H, and serves as a support for the reservoir when in place. The reservoir K has a bottom plate, 8, open at the center, and secured to the inner sides of the cylinder of the reservoir at any suitable distance from its bottom edge. The interior edge of the bottom plate, 8, is secured to a cylinder, t, and said cylinder t is secured to a ring, at, having an interior screw-thread cut on it. An air-tube, V, passes through the ring a, Fig, 14, to which it is secured, and projects upwardly within the reservoir and into the air-chamber formed by the raised part 19 of the top plate, 12. Another air-tube, V, also passes through the ring u, to which it is se' cured, upwardly within the reservoir through the top plate. 1), and into the cap 19*. By means of the tube \V air passes from the cap 19 to the oil-holder E; thence through tube V to the top of the oil in the reservoir, the raised part 1) of the platep always forming an airchamber, however full the reservoir may be. It will be seen that there is an air-space between the oil-reservoir K and the outer cylinder, F. (marked in the drawings n,) and also a lesser airspace between the reservoir and the cylinder D, (marked in the drawings 11".)

The oil-reservoir K has lugs at x, which fit into openings 00 in plate H, Figs. 1 and 19 and 20. These lugs serve, when they are turned under the bottom edge of plate H. to hold the reservoir from rising by the action of the spring 2 on the valvesiem z or from the jolting of the cars. A strengtheningband, x 00 Figs. 1, l9, and 20, may be thrown around the cutouts or openings 00 in plate H.

My valve arrangement fixed in the bottom of the reservoir K, through which oil is admitted to the reservoir, and through which it is fed to the wick, is made as follows: The valve-seat L, Figs. 1 and 14, consists of a cast ring having an interior flange, y, adapted to receive a valve. This ring has a screw-thread cut on it exterior-1y, and is adapted to screw into the'ring to. From its lower edge the ring of the valve-seat has an extension, prefer ably cylindrical, so that it may serve, when the reservoir is held upside down, as an oilcup. From the upper edge of the valve-ring two stems or standards, '1" 1 Fig-s14, 15, and 16, project. A cross-bar, 3 perforated at the center to admit of the passage of a valve-stem, is secured to the standards 3/. Another cross-bar, 7 perforated at the center to admit of the passage of a valve-stem, is attached to the sides of the cylindrical extension y. Through these cross-bars passes a valve-stem, z, of the valve Z, Figs. 14, 15, and 16. The stem 2 has a notch, 2, cut in it on one side,below the valve, and has also a thumb-piece, 2, near its lower end.

Vhen the reservoir is to be filled,it is to be turned upside down, and by pressing on the thumb-piece e the notch 2 may be brought down to the cross-bar y. \Vhcn in this position, stem .2 may be pressed to one side to ad mit the oil. The stem z is fitted with a spiral spring, 2", above the valve Z. This spring 2 abuts against the cross-bar y, and serves to press the valve down on its seat when free to do so. When, however, the reservoir K is in position, the lower end of the valve-stem z rests on the bottom plate, 72, of the oilholder E, and the valve Z is thereby held above the valve-seat to any suitable distance.

The cast ring A, Figs. 1, 2, 3, 6, 8, 9, 12, and 13,has, as shown in the drawings, as integral parts of the casting, tubular air-conduits B. These conduits may, however, be of other material and otherwise attached. These conplate H.

duits are at their outer ends cylindrical, as

shown in Figs. 3 and 12, to receive the cylinders of the burner, as shown at Fig. 2, to which 7 they are secured, but may be of any form to suitthe chambers they receive. conduits join the ring A said ring is cut away, as shown in Fig. 6, and the upper side of said conduits are also cut away, and are fitted with covers 0, as shown in Figs. 1, 2, and 3. The cover 0, Fig. 10, has flanges c. and a at its inner'end,corresponding in every respect to the flanges b and c of the ring A, which serve as continuations of the flanges b and a when the cover is in position. The cover 0 has also on its upper face a flanged receptacle, c, to hold a card of directions for the instructions of the handlers of the lamp. The coverC atits outer end abuts against the cylinder of the burner and conforms to its shape.

An oil-conduit, M, Figs. 1 and 2, leads from theinside of the. oil-holder E through the airconduit B to the oil and wick cylinder L of the burner.

The conduits B and covers 0 are perforated by a hole, a and a (Shown in the drawings, Figs. 3, 8, 9, and 10, as square for the passage of alifting-arm, A also shown as square in Figs. 1, 2, and 19.)

I now proceed to describe my lifting-rod A, Figs. 1 and 2, and its function.

A liftingrod, A, passes through the hole a in the air-conduit B and the hole a in the cover 0, and through the brace-ring G and The lifting rod A is fitted at its lower end with a device, B, Fig. 21, for retaining the rod,when elevated, by engaging its catch Z) with the lower side of the conduit B. This device B, Figs. 21, 22, and-23, consists of a casting, I), having a thumb-piece, b", screwed to its lower end and studs b and 6 near its upper end and lower end. On the stud I) is pivoted a catching-lever, b, having the thumbpiece b and on the stud b is placed a spring, 11 which rests against the back of the catching-lever, and tends to force the lever through a slot cut in the side of the lifting-rod A. This device is inserted into the lower end of lifting-rod A, and when in position the catching projection 22 of the lever passes through the side of the rcd and rests on an uncut bar-like portion, 2), of the cut side as a retaining-support. The thumb-piece of the catching-lever also projects through the side of the rod below the said uncut portion 1). This device operates as follows: By pushing on the thumb-piece b" the rod is lifted un til the catching projection b of the lever b passes the edge of the bottom side of the air conduit B,when it is forced by the spring I) to project beyond the line of the side df the rod A, and engages with the said lower side of the conduit B. The rod is thus retained atthat elevation. This rod A, as will be more fully pointed outhereinaftenserves to lift the shadeholder, chimney holder, and burner -cone. The retaining device B is to be used when the Where these rod is raised temporarily-as, for instance, in lighting the lamp.

The lifting-rod is held permanently at anyheight desired by a thumb-sorew, 01, Figs. 8

and 9, which passesthrough a screw-thread boss, (1, on theside ofthe air-duct B,and into the conduit sufficiently far to press against the side of the lifting-rod.

' Above the brace-ring G a curved cast piece, C, having a square shoulder, fits into and is firmly attached to the lifting-rod, and is also firmly attached to a shade-holder, D, Fig. 2. I make the lifting-rod thus in two parts, A and O, as a matter of convenience in construction.

The holder D shown in the drawingsis the one patented to me December 26, 1882, by Letters Patent numbered 269,587. I however now make an improved hurricane jack or chimney-cap, D as shown in Figs. 2, 29, 30 and 31. This cap D is closed on top, and is perforated, as at f, to permit the results of combustion to escape around the sides, and internally is divided into compartments by divisionplates f; These plates serve to prevent drafts of air froniblowing across the top of the chimney through the air-opcningsff, and thereby creating a vacuum, and affecting, if not putting out, the flame ofthe lamp.

The liftingrod A also passes through a boss, E, Figs. 1, 2, 24 and 25, on a ring, F, fitted with a thumb-screw, e. By means of this thumb-screw the ring F may be held rigidly at any point on the lifting-rod between the brace-ring G and the air-conduit B. This ring is concaved, as atf' Fig. 3, to receive the edge of the shade D and has arms f f, Figs. 2 and 24, extending toward the center, where they are firmly attached to a cast ring, G. The ring F may be dispensed with by attaching the boss E and thumbscrew 6 to one of the armsfi This ring G, Figs. 2, 26, 27, and 28, has exterior flanges g and g on its lower and upper edges, and notches 9 cut in the flange y to allow of the passage of the retaining'lugs If, Figs. 26, 27, and 28, of another ring, H. Parts of a flange having the notch may be substituted for the flange g To the inside of the ring G is soldered the chimney-holder 9 Figs. 2 and 26, and inside the cl'iimney-holder g is attached a burnercap, The lower edges of this holder 9 and cap 9 extend about halfway down the side of the ring G, where they rest, when in position, on a burner disk or plate, K, Figs. 2 and 26, having air-opening is, open at the center. and having an upward flange, k", to receive a wick-tube, to which it is securely attached, and a downward flange, 7a, to fit over an oil and wick chamber. This burner disk or plate K is downwardly flanged on its outer edge, and is adapted to fit into ring G.

It will be seen, first, that when setscrew 6, Figs. 1, 2, and 24, is loosened, the lifting-rod A may be raised without raising the ring F leaving the other parts of the lamp undisand its attachments. In this case the shadeholder D and shade only will be raised,

turbed. Second, by securing the ring F to the lifting-rod, the rod in raising carries with it the shade-holder D and its attachments and the ring F and its attachments including the chimney-holder g and the burner-cap g leaving the wick-tube undisturbed and exposed, so that it may be readily trimmed or lighted.

In my lamp, in connection with the parts above described, I use a cylindrical oil and wick chamber, L, Fig. 2, which passes through the cylindrical end of air-eonduit B, Figs. 2, 12, and 13, to which it is secured. This oil and wick chamber L has a bottom plate, Z, furnished with a screw, Z", onto which an ornamented bottom spinning is screwed which extends upwardly to the air-conduit B. A drip-collar, Z, fits at its lower edge into the chamber L, next the top thereof, and is of less diameter at its top than at its bottom edge. A wick-tube, Z is secured to this dripcollar and also to the burner-plate K. The sides of the dripcollar are perforated, as at Z, to allow oil that would otherwise accumulate about the burner to re-enter the oilcham her. An oil-chamber cylinder, 3 havingadiameter greater than the diameter of cylinder L, so thatthere is an air-space, nflbetwcen the cylinders, fits into the cylindrical end of the airconduit B, Fig. 2, its bottom edge resting on the interior flange, Z, of the cylindrical end of conduit B. Flange Z encircles the oil and wick cylinder L, to which it is secured.

The cylinder M is cut out on the side toward the reservoir of the lamp. The size and shape of this cut corresponds to the size and shape of the cross-section of the air-conduit B, where its tubular part joins onto its cylindrical part or end, as shown in Figs. 2, 9, and 13.

The cast ring G and the air-chamber cylinder M are connected securely and closely together by means of a coupling-ring, H, h ing hooked retaining-1n gs hfladapted to go into notches of ring G. When the lugs are entered into the notches of the ring H, said ring H is turned until the hooked lugs h2 are engaged over and upon the flange of ring G. A screw-pin, h Figs. 2, 26, and 28, passes through the ring G and into a slot, h, in the side of cylinder M. This slot h" is of sufficient length to admit the insertion of the pin h when the retaining-lugs [L2 are passed up through the notches of the flange g of the ring G, and also to permit of the turning of the ring G sufficiently far to bring the hooked lugs it onto the flange into a retaining po sition. I prefer to. use an additional ring N, Figs. 2, 6, 27, and 28, outside of ring H, of rubber or some other non-conducting sub stance. When the additional ring is used, the pin h passes through the rings N and H into the slot If in cylinder M.

The cast ring A, Figs. 1, 8, and 4, has two or more bosses, at. These bosses are screwthreaded internally to receive a screw-bolt,

m, which passes through a hollow square, m, screwed into the lower end of the bindingrod m The binding-rod m is at its upper end screwed onto a downwardly screw-threaded projection or lug, m of brace-ring G, and serves to securely bind the brace-ring G and its attachments to the ring A and its attachments.

The lamp is suspended by the hangers m screwed onto a screw-threaded projection, on, of the ring G, and having foot-pieces m secured to'them at the upper end by a screw-lug, m The foot-pieces m are attached by screws to the ceiling ofa car or to any suitable support for a lamp. The threaded pin m has a hole, in, drilled through it, for the insertion of a rod by which it may be turned, to be screwed into or out of the boss at.

It will be seen that when the ring H, Fig. 2, is turned so that its retaining lugs It are opposite the notches in ring G, and the pin m and thumb-piece b of lifting-rod A are removed, the cast ring A, with its attachmentsviz., the cylinder D, the oil-holder E, the oilconduits M, the air-conduit B, and all the burner parts below the burner-cap Fig. 3-- may be taken down and away from the frame of the lamp, leaving the oil-reservoir K and the air chamber cylinder F suspended from the brace-ring G, and also leaving the raisingrod A, with the shade-holder D, ring F, and the ring G, with the chimney-holder and burner-cap gfisuspended from the brace-ring G.

By loosening the set-screw e and placing the ring H into retaining position relative to the ring G, the ring F, with its attachments, may be taken down with the ring A and its attachments above mentioned.

It will be seen, also, that the air-openings h in the plate H, Fig. 1, are little exposed to drafts of air, being guarded therefrom by the vertical walls of the plate H.

My invention possesses advantages over all other lamps designed for the same purpose with which I am acquainted. Among the ad vantages I mention the following:

((1.) The air-chambern, n, and n Fig.1, and a, Fig. 2, and the airspace of ring A, and airconduits B have an area greater than the area of the openings h h in plate H, which are large enough to support combustion. Therefore the air in these chambers will not be exhausted by a sudden disturbance of the atmosphere about the air-inlets. The burner being securely held in position, all the joints of my lamp are practically air-tight, and the flame is sustained by air coming through the opening provided for that purpose. I do not know of any other lamp on the hurricane principle which contains means for rigidly securing the burner parts together, and no other lamp in which such parts are not easily displaced by the jolt-ing of the cars. Such displacement admits air to the flame otherwise than through the hurricane-cap, and the lamp is as sensitive to uneven drafts as if no efiort had been made to embody the hurricane principle.

(12.) To cleanse the chimney, to trim or light the wick in other lamps of the same general character as mine, it is necessary to force it up to the chimney spring-holder until its bottom end will clear the cap of the burner. Then, by tipping to one side, it may be drawn down and out; but this practice soon spreads the springs, so that they will not set close to the chimney, and they soon become useless for the purpose for which they are designed. In my lamp the shade-holder containing the spring chimney-top holder D is raised away from the chimney by raising the rod A, so that the proper tension of the spring-holder D is never impaired or destroyed.

Oil is admitted to the oil and wick chamber L by an oil-conduit, M, leading from the oilholder E through the air-conduit B. 'In my lamp the oil-level (shown in the drawings, Figs. 1 and 2, by the line 00* m) is kept at a constant height. When the oil-holder E and oil and wick chamber L are full to the level of a line slightly higher than the line of the bottom ends of the air-tubes IV andV, the access of air to the inside of the reservoir is stopped,'and the oil thereafter is fed to the holder only so fast as consumed, on the wellknown principle of the student-lamp oil-sup- I am aware that air-chambers around an oilreservoir are not new, and also that it is not new to divide air-currents by division-plates. I therefore do not claim these elements, broadly.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows:

1. In a lamp, the combination of the bracering, G, the plate H, the oil-reservoir K, the rods in, the ring A, and the oil-holderE, substantially as described.

2. In a lamp, the combination of the cast ring A,the cylinder D, securely attached thereto and having the air-openings e e, the aircylinder F, the airronduits B, and the burner tubes of the lamp, the cylinder receiving the lower end and forming an airspace, substarr tially as described.

3. In a lamp, the combination of an oilholder, a valve, an oilreservoir having a valve-seat, a cylinder surrounding the valve seat, and an elastic ring encircling the said cylinder andsecurely held in position by the upper edge of said oil-holder, as set forth.

4. In a lamp of the student-lamp type, the

combination of the oil-reservoir K, having a reservoir and holder, an air-tube, W, connecting the air-cap chamber with the holder, and

consisting of a brace-ring, G, a cast ring, A,

having conduits for air and oil leading tolthe burner, and the binding-rods in, connecting said rings, in combination with a lifting-rod sustaining a shade-holder and passing through said conduits and the rim of said brace-ring, substantially as described.

7. In a lamp, the combination of a frame for the oil-reservoir, a shade-ring,a burner, and a vertically-adjustable lifting-rod for the shade and ring, the shade-ring adapted to be disconnected from the rod and rest on the burner.

8. In a lamp, the combination of a reservoir-frame, a lifting-rod movably fixed in said frame, and a ring carrying the chimney-h older and burner-cap, movably attached to said rod, substantially as described.

9. In a lamp the combination ofan oil-tube, a drip-collar having perforations and secured to the upper end of the tube, a wick-tube secured t0 the collar, and a perforated burnerplate seated on the collar and surrounding the wick-tube, as set forth.

10. In a lamp, the combination of a liftingrod, A, adapted to be moved vertically in guides on the frame of the lamp, a shadeholder, D, rigidly attached to said rod, and a ring, F, sustaining a chimney-holder and a burner-cap and movably attached to said rod, substantially as described.

11. In a lamp, the combination of wick-tube chamber, cylinder surrounding the chamber,

a burner-plate and chimney-holder adapted to be removed therefrom, and a coupling secured to the cylinder to engage the burnerplate, as set forth.

12. In a lamp, the combination of wickchamber L, cylinder M, burner-plate K, chimney-holder g", ring G, having openings IIO g and surrounding the burner-plate, and ring H, having hooked lugs h and surrounding the cylinder, as and for the purpose set forth.

13. In a lamp, the combination, with the ring G and the cylinder M, having slot h, of I 15 the coupling-ring H and a ring of non-conducting material secured to the coupling-ring by pin 12. as set forth.

The foregoing specification of my invention signed by me this 20th day of June, A. D. 1883.

JOHN KIRBY, JR.

Vitnesses:

ALFRED L. RoLLwAGEN, Brennan L. AYER.

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