US503127A

US503127A - Mo web enives

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Publication number: US503127A
Authority: US
Publication date: 1893-08-15
Anticipated expiration: 1910-08-15

Description

(No Model.) 3 Sheets-Sheet '1-.

R. BUTTON. MACHINE POR'GRINDING MGWER` KNIVES. Y No. 503,127. Patented Aug. l5, 189.3.

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Rf BUTTON. v MACHINE POR GRINDING MOWER KNIVES. Nm 503,127. ,Patented Aug'. l5', 1893.

UNITED TATES RUFUS DUTTON, OF NEW YORK, N. Y.

MACHINE FOR GRINDING MOWER-KNIVES.

SPECIFICATION forming part of Letters Patent No. 503,127, dated August 15, 1893.

Application iiled January 17, 1891. Serial Nn. 378.337. (No model.)

To all whom t may concern:

Be it known that I, RUFUs DUTTON, a citizen of the United States, and a resident of New York, in the county of New York, State of New York, haveinvented a certain new and useful Improvement in Machines for Grinding Mower-Knives, of -which the following is a specication.

My invention relates to improvements in that class of machines for grinding mower knives, which use a rectangular faced grinding wheel, wherein the knife is held during grinding in a substantially vertical position, and wherein the grinding wheel oscillateslaterally, so that at its extreme lateral positions the face of the grinding wheel is at an angle suitable to grind the beveled edges of the mower knife sections; and the present application relates particularly to modifications over the machines shown in my application for Letters Patent of the United States, filed December 26, 1890, Serial No. 374,943, in that said application for patent the swiveling pivot is shown in front of the knife clamp, so that the knife clamp is between the said pivot and the grinding wheel, and the said machine is further so organized that the grinding wheel grinds in succession the two opposite edges of the same knife section. The'present application shows a machine diderently organized and which grinds the knife sections in a radically different manner. That is, to say, the pivot is now placed vbehind the grinding wheel, so that the said grinding wheel is between the pivot and the knife clamp, andthe machine is so organized that the grinding wheel will grind in succession the opposite edges of every other knife section, but one. Thus if when the grinding wheel is at its extreme right-hand position, the left edge of its grinding face will be in position to begin grinding the left beveled edge of a knife section. Then when the grinding wheel arm is oscillated to the extreme left-hand position the right hand edge of the face of the wheel will be in the position to grind the right-hand beveled edge of the next knife section but one on the left of the knife section whose edge was first ground. Thus the machine is so 0rganized that the grinding wheel passes by or skips one knife section. In order to effect this the swiveling pivot is placed as far as possible from the grinding face of the wheel; that is, as stated, entirely behind the grinding wheel, and thus the radial distance from the pivot to the said grinding face is so great, that the chord of the arc through which the face of the grinding wheel oscillates is longer than the breadth of aknife section measured parallel to the knife clamp frame, and I prefer to so organize the machine that the said chord shall be longer than the said breadth of a knife section by the width of the grinding face of the wheel. Now, l have ascertained that the machine will fulfill this condition when the swiveling pivot is placed at the intersection of the two perpendiculars drawn from the lines of the opposite beveled edge of a knife section and of the next knife section but one, and from points on said lines which are each distant outwardly from said beveled edges a distance equal to one-half the width of the' grinding face of the wheel (or what is the same thing, if the wheel be throughout of equal thickness, the thickness of the said wheel); As before said, this organization secures a long radius for the oscillations of the grinding wheel, and thereby a simple means is provided for grinding knives with dierently beveled edges on the same machine. For it is evident that when the grinding wheel is at its extreme lateral positions it will grind bevels at the greatest inclination with the plane of the knife but that at any points between these extreme limits it will grind Hatter bevels. Consequently it is only necessary to fix a knife section in the knife clamp so that the grinding wheel will grind the section when the wheel is between its extreme lateral positions, in order to grind flatter bevels, and this flatness may be varied, according to the position in which the knife is set in the clamp.

The present application differs again from the prior application hereinbefore referred to in the means for reciprocating and oscillating the grinding wheel, and for reciprocating the k'nife clamp. For the first purpose l herein substitute a simple handle on the front end of the wheel arm, in place of the lever and link of the said application, and for the second purpose I now employ a thumb lever, which is pivoted on the handle in combination with a flexible connection between the thumb lever and the knife clamp. Further- IOO more,l now provide means forsupporting the grinding wheel above the water in the trough when the said wheel is in a lateral position suitable for beginning grinding.

Referring now to the drawings which accompany the specification, Figure l is a side elevation of the machine, with the grinding wheel at its lowest position. Fig. 2 is also a side elevation opposite to Fig. l, showing the gears, and the wheel lifted to a height suitable for beginning grinding. Fig. 3 is a top view showing the wheel at its extreme right hand position ready for grinding the left hand edge of a knife section. Fig. Llis a View of the knife clamp end of the machine, showing a knife in the clamps, and the grinding wheel at its extreme right hand position. Fig. 4, is a diagram showing how the location of the swiveling pivot is determined. Fig. 5 is a view of the crank end of the machine. Fig. G is an enlarged elevation of the wheel frame and the base, showing the construction of the swiveling pivot, and also the stud for the crank gear, and the support for the wheel arm. Fig. 7 is a similarly enlarged view of the base from below, showing the stops which limit the oscillation of the wheel arm. Fig. S is a detail of the devices for throwing the knife clamp toward and from the grinding-wheel, said wheel however not being shown in the figure.

The grinding wheel, A, is a solid wheel of any suitable grinding material, and is preferably fixed on a rotatable shaft B, in any suitable manner. In Figs. l, 2, and 3, this shaft B, is shown supported by a wheel arm, O, which is formed as a hood, c, over the wheel, A, and has side pieces or arms, c c2 which descend to either side of the wheel, A, and in which are formed bearings for the shaft, B. The wheel arm, C, extends some distance to the rear of the wheel, A, or to the side opposite to the knife-clamp, and is hinged by a hinge, d, to a wheel frame D. The hinge, d, is parallel to the shaft, B, so that the wheel arm, C, with the wheel A can reciprocate in a plane perpendicular to said shaft, B, and the said wheel frame, D, is swiveled upon abase D of the machine by a pivot E. This pivot E, is very efficiently constructed of a bolt E, which is passed through a true cylindrical hole in the wheel frame D,and a corresponding hole in the base D, and is held in place by a nut, e. The construction of the pivot, E, is very clearly shown in Figs. 1, 5 and 6. The pivot, E, is preferably placed in the perpendicular plane which passes through the center of the face of the wheel, A, and the direction of the pivot, E, is perpendicular to the shaft, B, but its position is behind and altogether outside of the periphery of the grinding wheel, A, so that if the pivot, E, were prolonged it would not intersect any part of the periphery of the said grinding wheel, A, but would pass some distance to the rear thereof; and, as hereinbefore stated, the said pivot, E, is positioned at the intersection of the perpendicnlars drawn from the lines of the opposite beveled edges of a knife section and of the next knife section but one, and from points on said lines which are each distant outwardly from the said beveled edges a distance equal to one-half the width of the face of the grinding wheel, A. The amount of lateral oscillation of the wheel arm, C, about the said pivot, E, is limited by the lug d3, which is secured to the wheel frame, D, and moves laterally in a circular recess, d, which is formed on the base D. The shoul ders, of the said recess, d4, limit the oscillation of the lug, d3, and thereby the oscillations of the wheel arm, C. In the organization of the machine the said recess, d4, is so proportioned that the lug, d3,oscilla tes through such an arc, that the chord of the corresponding are of oscillation of the face of the grinding wheel, A, is greater than the breadth of a knife section measured parallel to the knife clamp frame by the width of the face of said grinding wheel, A.

It is a very convenient organization of the machine, to cast the base, D integral with a water-trough, F, letting said water-trough F, form the bed of the machine, and providing the said trough, F, with ears, f, f, which are pierced with holes forbolts to secure the grinding machine in any suitable support. The water-trough, F, base D', wheel frame, D, hinge, cl, and arm, c, are also carefully organized with reference to the diameter of the wheel, A, and the position of the knife section, M, when placed ready for grinding, so that when the wheel is at rest, it maybe lowered below the water-level in the trough, F, as indicated in Fig. l, and when the Wheel is raised to the position for beginning grinding, at the bottom of the V-notch between two knife sections, as in Fig. 4, the wheel, A, will be lifted above the water-level in the trough, F, as indicated in Fig. 2. Thus before grinding, the wheel, A, is revolved a few times slowly in the water in trough, F, to thoroughly wet its grinding surface, and then the wheel, A, is lifted above the water-level in the said trough and the grinding is begun. In this way splashing is avoided, and the wheel will absorb water enough to grind several knife edges with one wetting. The aforesaid organization of a water-t rough and reciprocating grinding wheel, in order to avoid splashing, is shown in the machine disclosed in my application for Letters Patent, Serial No. 374,943, hereinbefore referred to. Butin the present oase I combine such organization with different pivotal and oscillatory devices as hereinbefore set forth, and I also introduce new means for retaining the grinding Wheel, A, above the water-level in the trough, F, when the wheel is in its lateral positions and ready for grinding. To effect this end, a post or support, d is secured to the base, D', and is of just such a height that when the hood, c, of the wheel arm, C, rests on the top of the support, d', the wheel, A, will be lifted out of the water in the trough, F, andwill be at the proper height to begin grinding. In order to permit the wheel to drop into the water, a hole, c3, is made in the middle of the hood, c, so that when the wheel is at its middle position, over the center of the trough, F, the hole, c3, will come in line with the top of the support, d', and permit the arm, C, to drop down over said support, d.

For rotating the wheel, A,I employ a train of gears as seen in Fig. 2, which mesh with a pinion, g, on the shaft, B. The first gear, g', in the train, is formed integral with a bevel gear, g2, which is mounted on a line 'with the hinge, d', and engaging with this bevel gear, g2, is a bevel gear, g3, at right an gies to the aforesaid train of gears, and mounted on a stud, d2,'which projects from the base, D, at right angles to the shaft, B. The gear g3, is rotated by a crank arm, G, and by reason of the gear, g2, being pivoted in line with the hinge, d, the said gear g2 will mesh with .the gear, g3, during all the reciprocations of the wheel-arm, C. For producing the reciprocation of the arm, C, a handle, H, is firmly secured to the front end of the wheel-arm, C, by means of the lug, h and a bolt and nut, as seen in the drawings, orin any other suitable manner, and a person can readily turn the crank, G, with one hand while he reciprocates the wheel-arm, C, by the handle, H, with the other hand. The extent to which the wheelarm, C, can be elevated by means of the handle, H, is limited by the stop, h', on the said Wheel-arm, C, and a corresponding stop, h2, on the wheel frame, D, as seen in Fig. 6, and the handle, H, is also used by the operator to oscillate the grinding wheel, A, laterally, as hereinbefore described.

For holding the knife sections durn g grinding I use two knife clamps, J, J, which stand substantially vertical and each of which is firmly fixed on, or made integral with a knifeclamp frame, K. This clamp frame, K, is a skeletonized casting, and is made with lugs, k, projecting downward and hinged at, Z, by means of a horizontal rod, L, and ears, m, m, which are 'conveniently cast on the water trough, F. The'rod, L, is parallel with the wheel shaft B, so that the knife clamp can reciprocate toward and from the wheel, A. The knife clamps, J, J, are each formed like a goose neck to receive a knife section, M, and have set screws, j, which are set up against the knife section, Mto hold the same in the clamps, J, J. The knife-clamp frame K, has a ange, lo', extending from end to end of the frame parallel to the hinge rod, L, and also has brackets, 7a2 102, one at each lower corner of the knife clamp frame K, as seen in the drawings, for supporting the knife back. Thus, by means of said ange, 7c', and brackets, k2, k2, the knife back is guided While being slid along on the clamp frame and is supported at the proper height above the waterlevel in the trough, F.4

In organizing the machine the seat, k2, as well as the ange, le', is carefully adjusted to the wheel-arm, C, hinge, d, base, D, and part, D so that when the wheel A, is raised to the bottom of the V-notch between two knife sections, the wheel, A, will be lifted out of the water in the trough, F, as hereinbefore set forth.

For reciprocating the knife-clamp, J, a thumb-lever N, is pivoted on the handle, H, and the free end of said thumb-lever, N, is attached to one end of a flexible connection, O, which may be an ordinary strong cord, and the flexible connection, O, is guided around a sheave, 0, which rotates on a stud that is fixed to the wheel-arm, C. The other end of the flexible connection, O, is secured to the knife clamp H, J, or frame K, in any suitable manner, as by means of an eye in one of the knife clamps, as seen in Fig. l. The said sheave, o, is placed on the wheel-arm, C, exactly in line with the pivot, E, or very near to the line of said pivot, as is well shown in Fig. l. When so situated the length of the liexible connection, O, between the thumb-lever, N, and the knife-clamp, J, remains practically constant notwithstanding the oscillations of the wheel-arm, C, and the operator can control the reciprocations of the knife clamps, J, J, in all positions of the said wheel-arm, C. The knife-clamp is thrown away from the grinding-wheel, A, when the pressure 0n the thumblever N, is relaxed, by means of a small spring, p, coiled on a pin, q, which is fixed on the end of the trough, F. The spring, p, presses against an arm, r, which is fixed .to the knife-clamp frame K, and is perforated with a slot which passes over the pin, q.

s, s, are guides on the knife clamp frame K, to indicate where a knife should be fixed in the clamp so as tobe properly ground with the edges of aknife section at the normal level. The V-notches between the knife sections are placed exactly opposite these guides, s, s, as seen in Fig. 4. It will be observed that the grinding wheel A, if swung to the right, will be in position to grind the lefthand edge of a certain knife section. If swung to the left, it will be in position to grind the right hand edge of the next `Section but one on the left of the section first ground, passing by the intermediate section.

I claiml. In mower knife grinding machines, a device for grinding knives of different bevels on the same machine, consisting of a knife clamp and its frame, a grinding Wheel journaled in an arm which is swiveled with respect to the knife clamp frame by a pivot that is perpendicular to the axis of the grinding wheel, and is distant from the grinding face of' the wheel a greater distance than the diameter of the grinding wheel, and stops on the base for limiting the lateral swing of the arm, so placed that the chord of the arc through which the grinding face of the Wheel IOO IIO

swings is greater than the breadth of aknife section measured parallel to the knife-clamp frame, as described.

2. In a mower knife grinding machine, a knife clamp and its frame, a grinding wheel and its frame, and the said frames swiveled with respect to each other by a pivot, which is positioned at the intersection of the perpendiculars respectively drawn from the line of a beveled edge of one knife section and from the line of the opposite beveled edge of the next knife section but one, and from points on said lines which are each distant outwardly from the ends of said beveled edges a distance equal to one-half the width of the face of the grinding Wheel, as and for the purpose described.

3. In a mower knife grinding machine, a water trough, a grinding wheel horizontally journaled in an arm which is hinged parallel to the axis of the grinding Wheel on a wheel frame that is swiveled over the rear end of the water trough by a pivot which is horizontally distant behind the grinding face of the wheel, a distance greater than the diameter of the grinding wheel, a knife clamp having horizontal brackets to support a knife back, and the brackets located on the knife clamp, so that the height of the bottom of the V-notch between two knife-sections above the water-level of the trough is greater than half the diameter of the grinding wheel, as described.

4. The combination in a mower knife grinding machine, of a knife clamp adapted to hold a knife blade in asubstantially vertical plane, a grinding Wheel, horizontally journaled in a wheel arm which is hinged parallel to the axis of the grinding Wheel on a wheel frame swiveled on a stationary part of the machine bya pivot which is distant horizontally behind the knife clamp a greater distance than the diameter of the grinding wheel, a hand lever fixed on the front end of the aforesaid wheel arm for the purpose of oscillating said wheel arm laterally, and also of reciprocating said wheel arm vertically, and a stop on the Wheel arm and a corresponding stop on the Wheel frame for limiting the vertical movement of the wheel arm, as described.

5. In a mower knife grinding machine, means for holding a knife section on the face of the grinding wheel, consisting of a lever pivoted on a handle attached to the grinding wheel arm, and the free end of the lever connected with one end of a iexible connection which is guided arounda sheave journaled on the wheel arm, and has its other end attached to the knife-clam p, as described.

6. In a mower knife grinding machine, means for reciprocating a hinged knife-clamp to and from a grinding wheel, which means consist of a lever pivoted on the hand lever attached to the wheel arm, and the free end of the lever connected with one end of a flexible connection which is guided around a sheave journaled on the wheel arm, substan tially over the center of the lateral oscillation of said arm, and has its other end connected withy the knife clamp, and a spring interposed between the knife clamp and a stationary part of the machine and actuating the knife clamp in a direction opposite to the pull of the fiexible connection, as described.

7. In a mower knife grinding machine, a wheel armV supporting a grinding wheel and hinged parallel to the axis of the grinding wheel, on a wheel frame which is swiveled on a stationary part of the machine, by a pivot which is perpendicular to the axis of the grinding wheel, a projection on said wheel frame oscillating in a recess in the stationary part, which recess is in form an arc of a circle, and shoulders on said stationary part which engage the projection on the Wheel frame at its extreme lateral positions, as described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 8th day of October,

RUFUS DUTTON. Witnesses:

IRVING E. SMITH, BERNARD J. IsECKE.