US503341A - Machine for cutting packing-rings - Google Patents

Description

(No Model.)

M. E. BRIGGS. MACHINE FOR CUTTING PACKING RINGS.

Patented Aug. 15, 1893.

if PMHM UNITED STATES PATENT OFFICE.

MORRIS E. BRIGGS, OF ST. LOUIS, MISSOURI.

MACHINE FOR CUTTING PACKING-RINGS.

SPECIFICATION forming part of Letters Patent No. 503,341, dated August 15, 1893.

Application filed May 2, 1893- Serial No. 472.739. (No model.)

To all whom it may concern.-

Be it known that I, MoRRIs E. BRIGGS, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Machines for Cutting Packing-Rings, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming a part of this specification, wherein like symbols of reference refer to like parts wherever they occur, and in which- Figure 1 is a side elevation, partly in section. Fig. 2 is a top plan view with the knife removed. Fig. 3 is a front elevation. Fig. 4 is a form of ring, out on the machine.

My invention relates to a new and useful improvement in machines for cutting packing rings, for piston-rods, 850., in which a movable carrier is used for clamping and drawing the continuous packing (as it is handled commercially), a given distance from the knife, (which determines the diameter of the piston by a scale;) and in combining therewith, means for determining the varying compressions and consequent differences of the interior circumferences of rings of different thicknesses. This I accomplish by the construction illustrated in the accompanying drawings, in which- 1 indicates the base of any suitable form and construction, said base forming a support for a stationary drum 2, which is bolted or-otherwise secured thereto. This drum 2 is formed with a guide flange 2 which is preferably provided with a gage (not shown), for determining the thickness of the packing to be cut, thus obviating the necessity of first measuring the same. The upper portion of this drum is slotted as at 2 to afford reception of the blade of a knife 3 which is pivoted in the outer end of a hanger 4 secured to the drum at an angle of about forty-five degrees. By so arranging the knife, when the packing to be out is in posit-ion against the guide flange 2 the knife 3 when forced down, will, by its peculiar shaped cutting edge, sever the same, at the same time crowd ing the packing against the guide flange, thereby preventing any variance due to the possible displacement of the packing from its position against the flange.

On the front end of the drum, is a face plate 5, which is preferably secured thereto, by through clamping bolts 6 and 7, the former being centrally located to center the respective parts, and the latter being located to one side to add rigidity to the structure. These bolts preferably extend through the support 1, where they are clamped by their respective nuts. If desirable additional screws 5 may be added, which are received into the drum 2 after passing through the face plate 5. This plate 5 is formed with a shoulder 5 on its inner side upon which is revolubly received a movable carrier 8, in the form of a ring as shown, being provided with handles 9 for rotating the same. Secured to this ring and extending over the drum 2, is a clamp in which one end of the continuous packing is secured; this clamp comprising a securing member 10 which is secured to the carrier 8, a right angle extension 11 which extends over the drum 2, which extension is provided on its end with a stop block 12, the operating face of which is cut on a plane parallel with the cut of the knife 3, and a plate 13 provided with teeth on its inner clamping edge, said plate being hinged to the securing member 10, and being operated by a thumb nut 14 mounted on a screw 15 which is pivotally mounted on the right angle extension 11 to accommodate the varying angles assumed by the plate 13 in its movement. I preferably surround the screw 15 by a spring 16 which tends at all times to hold the plate away from the drum.

On the carrier ring 8, is a gage plate 17, which indicates the length it is required to cut a piece of packing, in order to insure a snug fit around a shaft of given diameter. This length is of course determined by the distance from the knife 3 to the stop block 12, it requiring, say for a piston of two inches diameter, a distance of 6.2832 inches between the two. This distance of 6.2832 inches of lineal measurement between the knife and the stop block, would of course be taken on the curved line of the drum, and, as is well known, that the same lengths of packing of different thicknesses will not encircle the same shaft, it is necessary to compensate for this variance in the thickness. This variance is attributable to the reasons which I will illustrate as follows: Assuming, for the purpose of illustration you have a shaft two inches in diameter which you desire to encircle with packing rings, one ring to be one-eighth of an inch thick, and the other to be one inch. The ring of one-eighth inch thickness would be out nearly six and five sixteenths of an inch long, in order to allow for the compression of the inner circumference, while the ring of one inch thickness would have to be cut about eight and one-half inches in length to compensate for greater compression of its inner circumference which is due to the greater bulk of material. To compensate for this, I mount on the drum "2 a scale plate 18 which indicates the additional length necessary for the various thicknesses, over and above that required for atlat inelastic ring, which would be 3.1416 times then placed against the stop block '12 and the movable jaw or plate 13 forced down there= upon by its binding screw. The indicator 19 is then moved on the plate 18 until its side (say for convenience the right side face) is over the line marked g which I will indicats with the dotted line a. The carrier is then moved away from the knife until the line on'the dial'l7 marked 2 registerswith the point of the indicator 19, at which time the knife is depressed,'severing-the packing to form a ringasshown' in Fig. 4. Should it be desired to cut a pieceof packing, say of one inch thickness, the end is first'cut at an angle and clamped in the clamping device or carrier, as before. The indicator 19 will be moved to the left (or right, dependingupon the movement of the direction of the carrier away from the knife) until the right side face is over the line marked one inch on thescale plate 18. The carrier is then moved to the left until the line marked 2 registers with point'of the indicator 19, at which time the knife will be operated to sever thepacking. The line for indicatingthe one inch thickness of packing, I will represent by the:

dotted-line b and it will be the length of the distance between these lines a, and 6 relative to the position of the clamping device, which is required-for a one inch packing in excessof a one eighth inch packing, to compensate for the difference in thickness and conse* quent difference in resiliency, due to the variance in the bulk of material, in order to cut the different thicknesses of packing to fit a shaft of a given diameter. It will of course be understood, that the scale 17 is measured and marked to include shafts of different diameters,-and the scale 18 is measured and marked to indicate the position of the pointer 19 for various thicknesses of packing other than those mentioned.

I am aware that many minor changes in the construction and arrangement of the several parts of my device can be made and substituted for those herein shown and described, without in the least departing from the nature and principle of my invention; such, for instance, instead of arranging the parts in the form of a circle as shown, I can form a straight track for the carrier, which would perform the same function, the scales being present.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a machine for cuttingpacking rings, the combination with a suitable knife, and a support therefor of a carrier upon which the packing material is received,-which carrier is provided with a clamping device for securing the end of the packing, a scale forindicating the diameter of the shaft,*arranged so that the movement of the car-riercan be regulated thereby, and a scale for indicating the increased lengthrequiredto compensate for the varying circumferences of the packing-when shaped in the-form of a ring, due to their varying resiliences and differencesin bulk, substantially as and for the purposes described;

2. In a machine for cutting packing-rings, the combinationwith' a suitableknifepivotally mounted, of a movable carrier provided with a clamping device in which the end of the packing is secured, a scale for determining thedistance between the knife and the clamping device which scale is markedwith the diameters of different sized pistons, a mov able indicator for said scale, and a scale for said indicator,'for determining the'increaed length necessary for packingsof diiferent' thicknesses, substantially as and for the purposes described:

3. In a machine for cutting packing, the combination with a drum formed with a knife slot, of a knife mounted on said'drum at an angle, a circular carrier provided with handles, and a clamping device mounted upon said carrier,substantially as and for the purposes described.

4. In a machine for cutting: packing, the

combination with a circular drum formed" with a guide flange andprovided witha knife slot, of a knife mounted thereon at an angle,

a carrier plate concentrically mounted'with relation to said drum, a clamping device mounted on the carrier, and a scale on the conibinationwith a circular drum provided with a knife slot, of a knife mounted thereon at an angle, a carrier ring concentrically arranged relative to the drum, a clamping device mounted on the carrier, a scale for said carrier for determining the length of movement necessary for the clamping device from the knife, for shafts or pistons of different diameters, a scale mounted on the drum forindicatin g the position of a movable pointer to determine the lengths required for different thicknesses of packing, substantially as and for the purposes described.

6. In a machine for cutting packing the combination with a drum provided with a knife slot of a knife mounted thereon at an angle, a carrier mounted on the drum, a clamping device on the carrier, and a stop block on the clamping device having its abutting face arranged at an angle correspnding to the blade of the knife, substantially as and for the purposes described.

7. In a machine for cutting packing the combination with a drum provided with a knife slot, a knife mounted thereon, a face plate formed with a shoulder clamped to the front end of the drum, through bolts for clamp ing said plate, a carrier ring revolubly mounted on the shoulder of the face plate, and a clamping device mounted on said ring and extending over the drum, substantially as and for the purposes described.

8. In a machine for cutting packing, the combination with a suitable knife and carrier, of a clamping device comprising a rigid jaw, a stop block formed with an inclined operating face mounted on therigid jaw, a pivoted clamping jaw, a threaded bolt passing therethrough, said bolt being pivoted on the rigid jaw, a spring surrounding the bolt for forcing the jaws apart, and a thumb nut on the bolt for forcing the jaws togethergsubstantially as and for the purposes described.

In testimony whereof I hereunto EtfilX my signature, in presence of two witnesses, this 22d day of April, 1893.

MORRIS E. BRIGGS.

Witnesses:

F. R. CORNWALL, HUGH K. WAGNER.

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