US112873A - Hebron mayhew wentworth - Google Patents

Description

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'testers raient No. 112,8?3, niet March 21, 1871.

lMPROVEMENT iN MACHINES FOR GRINDING` CARRIAGE-SPRINGS.

The Schedule rererred to ln these Letters Patent and making pari: oi' the same.

To-ell persons to whom these presents may come:

Beit known that I, Hannon MAYHEWWENTWORTH, of Gardiner, of the county of Kennebec and State of Maine, have invented a new and useful Machine for Grinding Carriage-Springs and other articles oi' -like character; and I do hereby declare. the same to be fully described in the following specification and represented in the accompanying drawing, of which- Figure 1 is a top view;

Figure 2, a front elevation;

Figure 3, a side elevation; and

Figure 4, a rear elevation of the said machine.

In such drawiugv A denotes the main frame, which supports not only the adjustable carriage B of the grinding-wheel, but the adjustable feed-wheel frame H.

The carriage B, arranged, as represented, on and across the top of the frame A, is fastened thereon by means of clamp-nuts and screws, as shown ata da a, the screws'being projected upward from the frame A and through slots b,'made lengthwise on the carriage B, such admitting of the saidcarriage being moved and adjusted in position on the frame A transversely thereof'. A I

The said carriage B supports in suitable boxes, c c, the shaft d of the grinding-stone or wheel C, whose periphery has formed in it a series of channels or'F grooves which are parallel to each other and extend entirely around the stone or wheel.

The endless belt d' goingaround a pulley, e, on the shaft d, and a pulley, f, on a driving-shaft, g, serves to 'transmit rotary motion from the pulley f to the pulley e, and thereby put the grinding-wheel in revolution.

Directly over the grinding-wheel are two feedwheels, D E, xed on the lower ends of vertical shafts, F G, supported vin an upright frame, H.' The said frame is to be secured to 'themain frame A so as to beadjustable vertically relatively to it, the two being connected vby clamp-screws and nuts, shown at h h, each of the screws going through a slit, t, made in the upright frame.

The two shafts F G, at or near their upper parts, are connected by a set of spur-gears, k l, the shafiiG being applied in its bearings so as to be capable of .swingingfaway fromthe shaft' F, it being pressed toward the said shaft F by a spring, m, and provided with means' by which it may be drawn away from the said shaft F in order to move the feed=wheel E away from the'feed-wheel D. .I

Such-means consist of a yoke or link, u, a treadle, an', and a line, o, fastened to the said treadle and the yoke, and going around guides arranged as shown at bevel-gear, q, fixed upon the upper end of the shaft F, engages with a bevel-pinion, fr', xed on one end of a horizontal shaft, q, supported by the frame An endless belt, r, going around a pulley, s, and

At the rear of the frame H andthe grinding-wheel C a lever, t, is arranged and supported on a pitman, u, as represented, the outer arm of the lever being fixed t`o the lower end of a spring, c, depending from a bracket, w.

A rope, x, extends down from the said arm of the said'lever to a treadle, y, arranged as represented.

In rearof the bite of the feed-wheels, and fixed to the frame H so as to be capable of being adjusted vertically, is an abutment, z, which, with the lever t, vserves to support and steady'ta spring and bear it upon the grinding-wheel. The said lever tI term the presser. A

i This machine is to grind or reduce a carriage-spring, a leaf thereof, or a long flat bar on either of its two opposite edges, generally speaking, to round such edges. To accomplish this the Vspring o1` leaf, as the case may be, tobe dressed or reduced, is to be inserted in the bite of ,the'feed-wheels, which is to be supposed to be directly over some one of the grooves of the periphery of the grindingfwheel.

As the spring may be fed along by the wheels it will pass underneath and against the abutment and over the inner arm of the'presser-le'ver, which, by

being forced upward, will force audserve to maintain the spring in contact with thegrinding-wheel; such wheel being supposed to be in rapid revolution, will reduce the edge ofthe spring or leaf, as may be required.

When the stone mayhave become too much worn in one 4groove the snpportingcarriage B may be moved laterally on the frame A, so as to bring a fresh groove of the stone underneath the bite'of thefeedwheels. So, as the stone may become reduced in diameter, the feed-wheels may be lowered and adj usted to it by lowering their sustaining-frame.

From the above it will be seen that the operative parts for Ifeeding and supporting the spring relatively to the grinding-wheel or stone are adj nstable, so as to enable them to be brought into their proper relations with the stone as it may become worn from time to time.

I claim- 1. The combination and arrangement of the carriage B and the frame H, provided with adjustments,

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