US970A - Improvement in xself-sharpening p plows - Google Patents

Description

JL W. POST.

Plow.

Patented Oct. 8, 1838. V

UNITED STATES PATENT OFFICE.

JOHN W. POST, OF BALTIMORE, MABYLAND.

IMPROVEMENT IN `SELF-SHARPEN|NG PLOWS.

Specificaton forning part of Letters Patent No. 970, dated October 8, 1838.

To all whom it may concern: V Be it known that I, JOHN WV. POST, of Baltimore, Maryland, have nvented a new and useful Improvement on Plows; and I do hereby declare that the following' is a full and exact description.

It has generall y been supposed that the plow has already assumed every possible forn that can add to the value of this indispensible implement, but it is also admitted that any imbeing alike on both sides. a a a represent a fiat surfaee. From (t to b b b represent a regular taper, leaving a rounded ridge from a to each point,0r the ridge may form an angle,as represented at a, Fig. 2, or a a, Fig. 3. The center, at c, Fig. 1, is a countersink, with' a hole in the middle, having slots extending toward each point ot' the share, as will be nore particularly dcscrihed hereinafter.

Fig. 3 represents the position of the share as attached to the nold board and landside.

Fig. 4 represents an inner section ot' the landsidewith the share-edgelodged in a groove, the groove passing* obliquely through, so as to let the shareedge appear on thcouter surface of the landside, as at (1, Fig. 3. d d, Fig. 5, also show the groove in the Iandside.

f, Fig.3,is the bolt-head eountersunk on the upper side of the mold-board. The bolt passes through the center of the share, has ascrew on the end, and a nnt holds the share in place.

I have now described the share as simply secured to the mold-board and landside; but by means of the branched hole or slots, as seen at Figs. 4 or 6, the edge of the share (when the edge that requires to be placed next to the i Fig. 7 represents a full-size countersink in the share. The dotted center, as at a. is the end of the screw under the share. The circle b is a washer. c c is the nut, and d d d are the slots extending outward from the center, as at d d d, Fig. 6. It will be perceived that by means of the slots the position of the sharein relation to the bolt, landside, and moldboard may be altrred. e e is a block of wood or metal, which may be fitted into the slot, and will be kept in place by the wasler and prevent the share from reacting from the bolt in any direction required. The block Will be longer or shorter to suit the position of the share.

Fig. S rcpresents the share as having one edge and two points, the sides a ar being blunt or square. Fig. 9 has the end b cut'- off. Figs. 10 and 11 represent the position of the share in the landside, the back end of the share a, next to the landside,coning flush through and not diag'onally, or mostly inside, as the threeedged share does in Figs. 3 and 4. This form of the share has a slot-hole, as seen at Figs. S and 9, to bring it flush with the landside when the side t-o be presented next to the landside is worn otf. From its susceptihility of being turned over and havingtwo points,it becomes a self-sharpener. 'The form with three edges is susceptible of a nuch greater number of changes.

Thepeculiar manner of uniting or combining the share with the mold-board and landside, and the niannerof regulating thepositio 'of the shareby means of the slot or slots in the share, all as represcnted in the different figures in the drawings.

JOHN W; POST; Witnesses:

OBED HUSSEY,

RroHD. B. GH NOWETH, Jr.

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