US295900A - Machinery for grinding chisels or tools of various kinds - Google Patents

Description

(No Model.) 2 SheetsSheet 1.

. J. BIRKENHEAD; MACHINERY FOR GRINDING OHISELS 0R TOOLS OF VARIOUS KINDS.

No. 295,900. a Patentd Apr. 1,1884.

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MACHINERY FOR GRINDING OHISELS 0R TOOLS OF VARIOUS KINDS.

No. 295.900.. "Patented Apr. 1, 1884.

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iiwrrnn STATES PATENT @rrrce.

JOHN BIRKENHEAD, OF MANSFIELD, MASSACHUSETTS.

IMACHINERY FOR GRINDING CHISELS OR TOOLS OF VARIOUS KINDS.

SPECIFICATION forming part of lietters Patent No. 295,900, dated April 1, 1884.

Application filed September 19, 1883. (No model.)

To cbZZ whom it may concern:

Be it known thatI, JOHN BIRKENHEAD, of

Mansfield, in the county of Bristol, of'the Oommonwealth of Massachusetts, have invented a new and useful Improvement in Machinery for Grinding Chisels or Tools of Various. Kinds; and I do hereby declare the same to be de scribed in the following specification and reptical transverse and median section, of a machine embodying my invention, the nature of which is defined in the claims hereinafter presented. Fig.5 is a rear elevation, and Fig. 6 a vertical and transverse section, of

. the rest S, for supporting the tool held in his hand by a person for being ground by the wheel or grindstone. Figs. 7 and 8 are opposite side views, and Fig. 9 a transverse section on an enlarged scale of one of the gears f, g, and h, to be hereinafter described. Fig. 10 is a front view, and Fig. 11 a horizontal section, of the arm L and the reducing-cutter R thereof, to be described. V

In such drawings, A denotes a grindstone, and B a trough for holding water for such stone to run in. The stone is fixed concentrically upon a horizontal shaft, 0, duly supported in boxes D and E, extending upward from the trough. This shaft is not only to be capable of revolving, but of being moved lengthwise within such boxes. The shaft 0 goes through a tubular neck, a, that projects from one side of the trough, and enters within and serves to support a hanger, F, carrying a tubular shaft, G, arranged in it, and provided with a driving-pulley, H, as represented. Furthermore, the shaft 0 extends through a tubular shaft, b, duly sustained by the hanger, and having with the said shaft 0 a feather connection.

On the sleeve b there is fixed and arranged,

as shown, a set of spur-gears, c d e, the gear a of which has a diameter larger than that of the gear (I, which is also larger than that of the gear 6. This set of gears engages with an other set of like gears, f, g, and 11, arranged on the shaft G so as to revolve freely thereon, the gear f having a diameter less than that of the gear g, and the said gear 9 also having a diameter less than thatof the gear h.

Within the shaft G isa slide-rod, 2'. provided with a knob, 70. A stud, Z, projects from the said rod through a slot, m, made longitudinally in the shaft G. This slide-rod. and its stud are for the purpose of locking either gear of the set of gears f g h to the shaft G. This may be accomplished by moving the shaft endwise, so as to cause the stud to enter a recess, min the hub of the gear to be locked. The gears are provided with annular grooves 0, so arranged in their hubs that when the stud is within either of such grooves the shaft will turn it around therein without revolving the gear of such groove.

From the above it will be seen that when the stud Z is in the recess a of either of the gears f, g, and h, and the shaft G is in revolution, such gear will be revolved and will revolve the gear upon and in engagement with it, in consequence of which the grindstone will be put in revolution. The two sets of gears, variable in their diameters, as represented, are to enable the periphery of the grindstone to be moved at or about a like velocity, as the stone from time to time may become reduced in diameter. It is found that a revolution of the circumference of the stone beyond a certain speed cannot well be kept up without water being thrown off the stone centrifugally to an inconvenient or improper extent. Therefore, as the stone may become worn or reduced in diameter, its speed is required to be increased, in order for any part ofits periphery to be moved at the requisite speed. In case the grindstone-shaft O is not to have any longitudinal motions, the sleevebmay be dispensed with, and the gears 0, cl, and e be fastened directly upon the said shaft 0.

While the grindstone may be in use it is desirable to give to it areciprocating movement endwise of it, as well as a rotary movement on its axis, such being to prevent it from becoming grooved by a tool while the latter may be in the act of being ground by the stone. To this end I have attached to the trough B and to the shaft 0 mechanism for effecting re-, ciprocating endwise movements of the shaft. This mechanism may be thus explained. The shaft C, at or near one end of it, is, screwthreaded, as shown at p, to engage with a worm-gear, q. An arm, 1", pivoted to theshaft 0, receives at its end a stud, s, projecting IOO down from another arm, t, that is arranged directly over and spans a heart-cam, a, fixed on the top of the worm-gear q. Thearm tis pivoted to a post, a, extended upward from a bracket, '0, fixed to the trough and arranged therewith in manner as represented.

From the above it will be seen that when the shaft 0 is in revolution its screw will revolve the worm-gear, which in turn will revolve the heart-cam. This cam in each revolution will impart reciprocating move ments to the arm 16, and as a consequence to the shaft 0 and the grindstone, in a manner to cause the grindstone to be moved endwise first in one and next in the opposite direction. The shaft 0 has a groove, 10, made in and around it transversely to receive a screw, so, screwed into the upper part of the trough, as shown in Fig. 4. On setting the screw down into the groove and removing the forked arm tfrom the heart-cam, there will be no endwise motion of the grindstone while it may be revolving.

The next part of the tool-grinding machine to be described is the mechanism for supporting the tool and adjusting it in inclination to the stone.

K in Figs. 1., 2, and 3 exhibits a baseplate that spans a lip, y, and is to be suitably fastened thereto by a screw, z, the lip being extended from the trough at one end thereof. Projecting upward from the said base-plate, and pivoted thereto, is an arm, L, which at its upper end is jointed to a plate, M. There are pivoted to the plate M and the base-plate K two screw-nuts, a, to engage with screws 12, extending, as shown, from a hand-wheel, c. The plate M has in its upper part a concavity, cl, (in form like the segment'of a sphere,) it being to receive an adjustable seat, 6, which is convex on its under surface, to fit. or nearly fit such concavity, the said seat being flat on its upper surface. This seat is arranged between two screws, f, fixed to and extended upward from the plate M. These screws go very loosely through holes in a clamp, N, extending over and across the seat,

there being on the screws and over the clamp two hand-nuts, O O. A tool or chisel, to be supported and ground, is to be placed between the clamp and the movable seat 6, and

' on the latter the seat 0 and the clamp being movable, so as to admit of the tool being inclined laterally and vertically, or in variousother respects, as occasion may require, to adjust it, as may be desirable, to the stone. While the grindstone may be in revolution, the screws-b are to be revolved by manual power applied to their hand-wheel c, in which case such screws, by their action with the two nuts'a, will move the plate M toward the stone, so as to cause the latter to continue to grind or reduce the chisel at its end, as may be required.

To the arm L there is applied a cutter, R,

for reducing or repairing the grindstone at its periphery, such cutter consist-ing of a sharp screw-thread, g, of steel, going around a cylinder, h, from end to end thereof, as shown in Figs. 10 and 11. This cutter is pivoted at its ends to the ears 2', projecting from the arm. By turning the arm L sufficiently backward and sliding the ,base-plate K toward the stone the cutter can be forced up to the periphery of such stone. On the grindstone being put in revolution the cutter will be revolved by it, and will remove any glazing, or cut down and reduce the periphery of the stone to that of a correct cylinder.

In advance of the grindstone there is fixed a rest, S, for supporting a tool to be ground, when held in the hand of a person. This rest, formed as shown in Figs. 5 and 6, spans the trough B at its upper part, and is held in place thereon by a set-screw, 7c. The said rest has an obtuse angular or tapering lower edge, as shown at m, the vertex of which is at the middle of the rest. Furthermore, the rest is paneled or recessed in each of its opposite sides, as shown at Z, such being to cause the water that may run down upon the rest while a tool on it may be in the act of being ground to run toward and be discharged from the middle of the rest rather than laterally from the rest without going back into the trough. i

Having thus described my invention, I claim- 1. The combination, substantially as described, for effecting reciprocating lateral movements of the grindstone, such combination consisting of the screw-threaded shaft 0, worm-gear q, arms r and t, and the heart cam u, arranged and adapted essentially as set forth.

2. The combination of the sleeve!) with the grindstone and its shaft, the two sets of gears, each set consisting of several wheels of different diameters, as set forth, the drivingshaft, the locking devices t l, and the mechanism, substantially as described, for effecting reciprocating lateral movements of the grindstone, such mechanism consisting of the screw-thread of the shaft 0, the wormgear q, arms a" and t, and the heart-cam a, all being arranged and adapted essentially asrepresented.

3. The adjustable tool-supporter, substan tially as described c0nsisting of the plate M, provided with the concavity d, and the screws f f, and the adjustable convex seat 6, and the clamp N, and hand-nuts O 0, all being arranged and adaptedessentially as explained, and such plate M being supported and having means of moving it, as specified, relatively to the grindstone.

JOHN BIRKENHEAD.

\Vitnesses:

R. H. EDDY,

E. B.- PRATT.

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