US970921A

US970921A - Lever-harrow.

Info

Publication number: US970921A
Application number: US53428509A
Authority: US
Inventors: Henry Hecht
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-12-21
Filing date: 1909-12-21
Publication date: 1910-09-20
Anticipated expiration: 1927-09-20

Description

H. HECHT.

LEVER HAnnow.

APPLIUATION FILED DBO. 21,1909. 970,921 Patented Sept. 20,1910.

2 SHEETS-SHEET 1.

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H. HEGHT.

LEVER HARROW. APPLIoATIoN FILED :1110.21.1900.

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HENRY I-IECI-IT,`OF JACKSON, MINNESOTA.

LEVER-HARROW.

Specification of Letters Patent.

Patented Sept. 20, 1910.

Application led December 21, 1909. Serial No. 534,285.

. Harrows, of which the following is a speciication.

This invention relates to spiked tooth harrows of that class which are generally known as lever harrows and which are equipped with means whereby the spikecarrying bars may be oscillated upon their axes to present the teeth in a tilted position t various inclinations to the surface of the A prime object of the present invention is to construct a harrow of the character described, wherein the oscillatory spikecarrying bar shall be capable of rocking movement independent of the adjusting movement, such rocking movement being resisted by the action of suitable springs, thus enabling the tooth-carrying bars to yield to such obstructions as may be encountered without danger of breakage and to be immediately restored to active position.

A further object of the invention is to provide a device of the character described of simple and improved construction in which the tension of the springs resisting the rockin movement of the tooth-carrying bars may e adjusted in a simple and convenient manner.

Still further objects of the invention are to simplify and improve the general construction and operation of a device of the character outlined above.

With these and other ends in view which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly pointed out in the claim.

In the accompanying drawings has been illustrated a simple and preferred form of the invention, it being, however, understood that no limitation is necessarily made to the recise structural details therein exhibited, but that changes, alterations and modifications within the scope of the invention may be resorted to when desired.

In the drawings,-Figure 1 is a top plan view of a harrow constructed in accordance with the invention. Fig. 2 is a longitudinal sectional view taken on the lane indicated by the line 2-2 in Fig. 1. T ig. 3 is a rear elevation. Fig. 4 is a sectional detail view enlarged, taken through a portion of one of the tooth-carrying bars and the lower part of the adjusting lever and related parts. Fig. 5 is a sectional detail view of a portion of one of the tooth-carrying bars, showing one of the teeth. Fig. G is a sectional detail view taken on the plane indicated by the line (3 6 in Fig. 4.

Corresponding parts in the several figures are denoted by like characters of reference.

The frame of the improved harrow is composed of side members 7 connected adjacent to their front ends by a cross bar 8 to which draft may be applied in any suitable, convenient and well known manner. The side members 7 afford bearings for the oscillatory tooth-carrying bars 9, which in the example illustrated in the drawings have been shown as consisting of tubular bars provided at intervals with slots or apertures in which teeth or spikes 10 are mounted and secured by means of fastening nuts l1. The side members 7 of the frame are additionally connected by means of suitable brace members 12, as will be best seen in Fig. 1 of the drawings.

Each of the tooth-carrying bars is equipped with a lever arm 15 having a hub 16, whereby it is mounted upon the bar, said hub being provided with a slot 17 for the accommodation of a pin or bolt 18 extending transversely through the tooth-carrying bar 9 upon which the hub is mounted, one end of the slot 17 constituting a shoulder 19 upon which the upper end of the pin or bolt 18 abuts to obstruct the oscillation of the toothcarrying bar in one direction. Oscillation of the toothecarrying bar in the opposite direction is resisted by the action of a spring 2O coiled upon the bar 9, one end of said spring being connected with the hub 16 by means of a lug or stud 21, while the opposite end of said coiled spring is securely connected with one end of a collar 22 loosely supportedu on i the bar 9 and having at one end a ratc iet face 23 engaging a pin or plug 24 that extends diametricatlly through the tooth-carrying bar 9. The collar 22 is provided with a erably the rearmost one, is provided with an upward extension forming a handle 26, and

the several arms 15 are connected by a longitudinally disposed link 27 having a rack segment 28 adapted to be engaged by a springactuated stop member 29 carried by the extension handle 26 of the lever arm 1,5. From the foregoing description, taken in ,q 'connection with the drawings hereto anlo yneXed, the operation and advantages of this invention will be readily understood by those skilledin the art to which it appert-ains. It obvious that lwhen the stop 29 is in en- .gagement with the rack segment 2S, the @parts are securely locked together to preve-ntloscillation of the tooth-carrying bars 1, @under'ordinary circumstances, and it is fur p' fthe'r obvious that by properly manipulating y the handle member 26, the tooth-carrying f ybars `may be oscillated to present the teeth "vertically or at various inclinations with i 'reference to the surface of the ground. This 'isldueto the fact that a connection is esftablished between the lever arms 15 and the y' "25 too'tlrcarrying bars 9 by the springs 20, the

tension ofr which is exerted to oscillate the rock bars in one direction until the upper endsof the pins or bolts 18 are supported `upon the shoulders 19 of the hubs 16 of the lever arms. When the device is in use,

however, if any obstruction should be encountered by any of the teeth, the bar carrying such tooth will be rocked against the tension o-f the spring, thus permitting the tooth to pass over the obstruction, after which the tooth-carrying bar will be restored evdzi to normal position by the tension of the spring.

The improved harrow is particularly useful not only in fields which vcontain numerous obstructions in the form of stones, stalks or the like, but it is found extremely useful in harrowing fields unencumbered with straw, corn stalks or the like, since such obstructions will be passed without being raked into large piles which then require to be discharged from or disengaged from the machine when a harrow of ordinary construction is used. It is obvious that the tension of the springs 20 may be very readily adjusted to suit varying circumstances. p

Having thus described the invention, what is claimed as new, is

A harrow frame, a tooth-carrying rock bar supported therein, a lever arm having a slotted hub engaging the rock bar, a stop member extending through the rock bar and abutting at its upper end upon the shoulder at one end of the slot in the hub, a collar supported loosely upon the rock bar, a spring coiled upon the bar and connected at its ends with the collar and with the hub of the lever arm, and means for securing the collar in various positions with relation to the rock bar to regulate the tension of the spring.

In testimony whereof I atlix my signature in vpresence of two witnesses.`

HENRY HE CHT.

fitnesses ASHER O. NASLEY, 7. L. HUNTER.