US669642A - Feed mechanism for stone-sawing machines. - Google Patents

Description

No. 669,642. Patented mar. 12,, neon.

- s. n. HUNTER.

FEED MECHANISM FOR STONE SAWlNG MACHINES.

(Application filed Dec. 14, 1899.: (No Model.

1 Sheets-Shoal l.

No. 669,642'. Patented Mar. 12 19m.

6. n. HUNTER. run mEcHA'msM run smna SAWING MACHINES. (Application filed Dec. 14, 1899.) (No hjodel.) 2 Sheets-Sheet 2.

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GEORGE D. HUNTER, OF BLOOMINGTON, INDIANA.

FEED MECHANISM FOR STONE-SAWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 669,642, dated March 12, 1901.

Application filed December 14, 1899. Serial No 740,307. (No model.)

To of whom it may concern:

Be it known that I, GEORGE D. HUNTER, a citizen of the United States,residing at Bloomington, in the county of Monroe and State of Indiana,haveinvented certain new and useful Improvements in Feed Mechanism for Stone- Sawing Machines; and Ido 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.

This invention relates to an improvement in feed mechanism for gang stone-sawing machines, and is embodied in the construction and arrangement of. parts hereinafter described, and defined in the claims.

The invention relates more particularly to that class of machines wherein ratchet-andpawl mechanism is employed to feed sawgangs down to the work gradually and by means actuated by the power driving mechanism. Heretofore it has been customary to connect the pawl-actuating means directly with the ratchet-wheels and train of gearing by a rigid connection, and it has been found that in the event of a stoppage of the movement of the feeding-screws, which often happens from various causes, that the continued movement of the pawl-actuating means results in the breaking of some of the mechanism, usually the teeth on the ratchet-wheels or cogs on the gear-wheel and in some cases the pawls. My invention is designed to overcome these objections; and it consists in providing a yielding connection to the actuating parts of the feeding mechanism, whereby a continued actuation of the pawl-actuating instrumentality can be had or permitted without injury to the machine.

In the accompanying drawings I have shown an embodiment of the invention, but desire it understood that various changes can be made without departing from the nature and principle of the invention.

In the drawings, Figure 1 is a side elevation of that portion of a stone-sawing machine which is commonly termed the feed. Fig. 2 is an enlarged view of my device. Fig. 3 is an enlarged detail view of the paWLandratchet mechanism and its associated parts, and Fig. 4 is a slight modification thereof.

As the invention relates wholly to the feeding mechanism it is not thought necessary to show any part or portion of the machine, as the construction is well known.

In the drawings, A represents a supporting beam or upright forming part of the machine. On this beam or upright are mounted the feed-screws B, the upper ends of which carry a miter-gear b; meshing with the corresponding gear on the horizontal shaft b, carrying other gear-wheels for connections to the feedscrew B, also spin-wheel on to mesh with pinion-gear for feeding the saw-gangs down. Other gears are arranged for raising or lowering the saw-gangs; but as this has nothing to do with my invention a description is unnecessary. The pinion-gear y by preference is made solid with the ratchet-wheel 4 and these two wheels as one are mounted on the ratchet-wheel lever y" to be thrown in or out of gear when desired by the lever F. All the above-described features are well known in the art.

Mounted on the ratchet-shaft is a lever G, carrying a pawl g, which engages with the ratchet-wheel. This lever has an elongated slot g therein, through which a suitable pin or bolt g passes and may be secured at any desired point. The pin g projects loosely through an opening in the bracket j, cast or secured to a sleeve or box H, which latter is formed with a longitudinal opening, through which the actuating-bar J passes. The bar J is connected at one end with the actuating mechanism, which is usually a crank dri y e n by suitable gearing and has a regulaF backward and forward movement. This construc-' tion is not shown, but is well known in the art. The rod J is formed with a shoulder j, and the shoulder extends for a considerable distance beyond the sleeve or casting H. On the projecting part of the rod J is sleeved a coil-spring E one end abutting against the nut b He end of the rod, while a the opposite end abuts against the end, of the sleeve or casting H, the tension of the spring being varied by the nut. In operation the actuatingbar J is drawn back, carrying the sleeve H firmly against the end of the spring, the tension of the latter being such that the lever G will move before the spring is wholly compressed. The movement of the lever actuates the feeding mechanism and reversing the movement of the actuating-rod resets the lever and pawl for the subsequent feed. Should the feeding train or screw be blocked in its movement, which is often the case, and the actuating-rod J continued in its movement, the full movement of the latter will be permitted by the continued compression of the spring K, the tension of the latter being less than the resistance to the feed, so that the spring will thereby prevent the breaking of any of the parts.

In Fig. 4 I have shown the construction wherein the reverse movement is employedthat is, the actuating-rod J acts to push the pawl-actuating lever rather than pull it, a spring being arranged on the opposite side.

The special means can be altered and the same can be applied in various ways and in various connections without departing from the invention.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is i 1. In a stone-sawing machine, the com bination with the feeding mechanism, of a swinging lever G for actuating the same, a reciproeating rod J for operating the lever, means for adjustably connecting the lever G and rod J together to permita slidingmovement of the latter, and a spring interposed between said connecting means and an abutment on the rod J, substantially as described.

2. In a stone-sawing machine, the combination with the feeding mechanism for the saws, of a ratchet-and-pawl mechanism for actuating the feed, a reciprocating rod for actuating the pawl, and a yielding connection between the rod and the pawl, substantially as described.

3. In a stone-sawing machine, the combination with the feeding mechanism for the saws, comprising a pawl and ratchet, of a reciproeating rod, a spring on the rod and a sliding connection between the rod and pawl against which the spring abuts, substantially as described.

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

GEORGE D. HUNTER.

Witnesses:

J. W. OHARRoW, O. O. PORTER.

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