US874175A - Lever mechanism. - Google Patents

Description

No. 874,175. PATBNTED DEG. 17, 1907.

7 F. A'. PALK. LEVER MEGHANISM. APPLIOATION FILED 'nu 23, 1907 m q." 5 wwf-z Mofa MWI/@01g 4 mi Vio FRANK A. FALK, or sTAoYvILLE, 'iowa i y LEVER MECHANISM.

Specification of Letters Patent.

Patented Dec. 1'? 1907..

Application shanty 2s. 1907. serai No.' 375,217.

To all whom it may concern: Be it known that I, FRANK A. FALK, residing lat Staoyville, in the county of Mitchell and State of Iowa, have invented certain new and useful Improvements in Lever Mechanisms, of which the following is 4a specification, reference being vhad to .the accompanying drawings.

My invention relates to improvements in lever mechanisms and particularly to lever mechanisms in which the position of the lever is controlled by the engagement of pawls between the teeth of a rack; and an object of my invention is to provide a lever mechanism of the class just described in which the position of the lever may be adjusted with" great nicety. A

' Another object of my invention is to rovide a lever mechanism of this class W ich will be simple in construction, cheap in manufacture andeflicient in operation.

In the drawings illustrating the principlev of my invention and the best mode now known to me of applying that principle, Figure l is an elevation showing one of the pawls engaged; Fig. 2'is a similar view showing both of the pawls disengaged; and Fig. 3

lis a section on the line AMA of Fig. 1.

In the base of the support o; is fulcrumed the lever b to which riveted or otherwise suitably secured a casin c, in which are slidably mounted the paw s d, the lower ends e of which rub together, while the lupper ends f are separated and are formed with the holes g. Between the upper ends g is interposed a toothed segment 't formed with an ear 'i to which is pivotally secured the latch .link-rod j and one end oi' theV coil-springv k,

the other end of which is secured to a bossm formed upon the lower part of the casing c. The upper portion of the su port #a a curved rackbar Vthiler it lias not been shown in the' drawing, .it will beunderstood that the upper end of the link-rod j is-pivot-4 ally secured to an ordinary thumb-latch by" which the iinlerod j maybe raised against the tension of the coil-spring f.

The parts being in the position shown Fig. 1', and it being desired' tamove the leverl a distance equivalent to onehalf the intervalA between two adjacent teeth o of the rack n, the .link-rod y' is pulled upwardly against the tension of the coil-spring lr thereby rotat1ng the toothed segment 71. to the left in the iigures. The teeth p f the left-hand side of the segment play the holes g of the left-hand pawl; and since this pawl rests upon the top of one of the teeth o, it remains stationary. The toothed -segment h acts as a lever, the ulcrum of which is the 'u per end of the lefthand awl; and the teet on the right-hand half o the toothed segment, by their enga e-` ment in the holes in the upper end of t e right-hand p'awl, raisethat pawl from between the teeth o ofthe rack n. The lever b may nowbe shifted in either direction.

-When the lower end of one of the pawls passes 'from the top of the tooth o', the coil- -spring 7c will immediately force that pawl into the notch between the teeth o, it being understood that the operator releases the link-rod y' so that it may be pulled down.

The casing and its contained. pawls, toothedsegment and spring may be made separately and in dilierent sizes and attached to the ordinary lever now in use upon farm machinery throughout i Athe country', from which it will appear that my new mechanism has a wide'iield of usefulness.

I claim 1. In a lever mechanism ofthe class described, the combination'with a lever and a rack for holding said lever in position, 'of a .pair of cooperating slidable pawls carried by said` lever, the lower ends of said pawls being adapted to rub against .each other and to engage alternatelysaid rack and the `upper' ends. of said pawls being separated; a device interposed between said upper ends and in engagement therewith; yielding meansv one end of which is secured to said device and the other end of which is secured to said lever; and means for `moving said device to raise one of said pawlsagainst the tension of said' yielding means;

2; In a lever mcchanlsm oi the class described, the combination with a lever and a rack for holding said lever in position, of` a pair ofcoperating ,slidable pawls carried by j saidv lever,`the lower ends of said pawls being adapted to engage alternately said`rack; a toothed device interposed between and-1n meshV with the upper endsof said pawls;

described the combination of a casing; a hand in the presence of the two undersigned Deir of cooperating pawls, the lower ends of which are adapted to rub together and the May, 1907. upper ends of which are separated.; end a de` 5 vice Jfor moving said pawls, said device being v interposed between said upper ends and in v Witnesses: e engagement therewith. H. C. ANDERsoN,

In witness whereof I have hereunto set my KATIE WELTER.

FRANK A. FALK.

witnesses at said Stacyvilie this 20th day of 10*l

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