US404670A - Grindstone and mechanism for the same - Google Patents

Description

(No Model.)

. H. A. AXTELL. GRINDSTONE AND MEOHANISM FOR THE SAME. No. 404,670. Patented June 4, 1889.

1 Flu I x 1 N l l v N P V m: N

o e I 1 UNITED STATES PATENT OFFICE.

HENRY A. AXTELL, OF MONTAGUE, MASSACHUSETTS.

GRl-NDSTONE AND MECHANISM FOR THE SAME.

SPECIFICATION forming part of Letters Patent No. 404,670, dated June 4, 1889.

Application filed'tl'uly 27, 1888- Serial No. 281,159. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. AXTELL, a citizen of the United States, residing at Montague, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Grindstones and Operating Mechanism for the Same; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention is an improvement in machin cry for operatin g grindstones, and has for its object to give the usual rotary motion to a grindstone and at the same time to impart a reciprocating lateral movement to the same,

so that a very narrow surface of stone onlyis required to grind an article its entire length while said article is held in a fixed position.

The rotary movement is imparted to the grindstone through a pulley-wheel or crank connected by ordinary means to the source of power. The lateral reciprocating movement is given to the stone during its rotary motion, as hereinafter shown and described, in either of two ways. First, a pulley is connected by a belt or other similar means to the pulley of the driving-shaft of a motor, and in connection with said pulley is a grooved head-block provided with a face grooved in dovetail form as ways for a sliding block pivoted to the shaft which carries the grindstone, through a pitman provided with a yoke pivoted to a collar which embraces the end of the grindstone drivingshaft. A bolt passing through the sliding block of the head-block and fitting into the groove of the base of the said head-block serves, when siutably adjusted, to regulate the leverage and throw to the reciprocating grindstone-shaft.

In the alternate arrangement for reciprocatin g the grindstone I dispense with the headblock and use a simple slotted lever pivoted at the base of the frame of the grindstone and connected to the engine driving-shaft or some intermediate shaft by means of a crank and pitman, the latter being, asin the first instance, connected to the grindstone-shaft by a yoke. In my drawings, illustrating my invention, Figure 1 is a plan view showing the grindstone and the apparatus for bringing about the simultaneous reciprocating and rotary motions fixed suitable journal-boxes, as B,ffor the grindstone-shaft.

C is the grindstone, which in my arrangement may be very narrow, fixed or keyed to a driving-shaft E- On one end of this shaft is a pulley D,which is connected bya belt to the motor, and upon the opposite end of said shaft is provided an annular groove, about which is fitted loosely an annular ring or collar c.

Extending from the box A is a bar A, from the outer end of which drops a leg A This leg and bar serves as a support to a journal bearing A which incloses the journal of a shaft H. The shaft H is provided on one end with a pulley d, and fixed to the opposite end of said shaft is the head-block I, provided with a rectangular groove 6 and a dovetail groove f, connected by a slot f. These slots and grooves run longitudinally with the body of said block and form ways for a sliding block K, of dovetail form, and the bolt K with a flat head k. The bolt K may be fixed to any point in its slot and groove by means of a nut h, which clamps the head-block and sliding block firmly together. Pivoted to the sliding block K is a pitman F, provided with ayoke a, which embraces the annular collar 0, and is thereto pivoted by the screws 1).

Motion is imparted to the shafts E and H, from the motor employed, in any suitable wellknown manner simultaneously, and while the grindstone is being rotated about its axis from the pulley D it receives its reciprocating movem cut through pulley d, shaft H, blocks I and K, and pitman F, the latter of which is allowed free play, being pivoted in its connections to the sliding block K and the shaft-collar c.

In order to exhibit the alternate arrangement in which I dispense with the head-block, I provide an arm N, fixed to the bottom of the box A, and to the end of this arm I pivot a lever 0, provided with a slot 1). The headblock on the shaft H and the sliding block being dispensed with, a crank Q, connected or pivoted to the shaft II, is pivoted to the pitman F. This is only another Way of converting rotary into reciprocating motion, and is only mentioned to illustrate that, although the head-block arrangement is preferred, other well-known means may be employed to reciprocate the grindstone during its rotation.

The advantages of the double-acting grindstone are obvious, and hardly need be meutioned.

The body and arms of the person holding the article being ground may be fixed and Without movement while the grindstone is moving, so that the article, with reference to the surface of the stone, may be absolutely without movement, it desirable, thus insuring more even and perfect Wor c. Less labor and skill is required of the grinder, as he is not required to be constantly in motion in adj usting his article being ground and his own body to keep the surface of the article to normal bearing on the stone.

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

The combination,with a rotary shaft and a pulley fixed thereon, the grooved head-block fixed to said shaft, and the block. K, adjustably secured to said head block by a bolt, the head of Which fits in the groove of the said block, of a shaft arranged at right angles to the head-block shaft, provided with a pulley, a grindstone, and a loose collar, substantially as described, and the pitmau, as described, pivoted to the said loose collar, and the block K, as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY A. AX'IELL.

\Vitnesses:

RICHARD N. OAKMAN, J12, llA'r'rirz E. SMITH.

Images