US794912A - Stump or rock extractor. - Google Patents

Description

PATENTED JULY 18, 1905.

W. H. WRIGHT. STUMP 0R ROCK BXTRAGTOR.

APPLICATION FILED DEC. 16, 1904.

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UNITED STATES Patented July 18, 1905.

PATENT OEEICE.

STUMP OR ROCK EXTRACTOR.

SPECIFICATION forming part of Letters Patent No. 794,912, dated July 18, 905.

Application filed December 16, 1904:. Serial No. 237,149.

To all whom, it may concern-.-

Be it known that I, WILLIAM HARRISON WRIGHT, a citizen of the United States, residing at Laconia, in the county of Bellmap and State of New Hampshire, have invented a new and useful Stump or Rock Extractor, of which the following is a specification.

This invention relates to an improved stump and rock extractor, and has for its object the production of an inexpensive, durable, and eflicient device of this character capable of exerting a maximum lifting power'at a minimum expenditure of labor.

The invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in form, proportions, and minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention.

In the accompanying drawings, forming a part'of this specification, Figure 1 is a side elevation of a stump and rock extractor con structed in accordance with my invention. Fig. 2 is a side elevation of the operating mechanism detached. Fig. 3 is a'similar view of the opposite side of the same. Fig. 4 is a detail view of the supporting-bar. Fig. 5 is an edge view of the same. Fig. 6 is a front elevation of the handle-socket. Fig. 7 is a detail perspective view of the locking-pin detached. Fig. 8 is a detail perspective showing the manner of attaching the spring to the end of the latch.

Similar numerals of reference indicate corresponding parts in all the figures of the draw- 1ngs.

In carrying out the invention I employ a supporting-frame 5, preferably triangular in shape, as shown, and to the apex of which is secured in any suitable manner a clevis 6, from which is suspended the lifting mechanism.

The lifting mechanism consists of a supporting-bar 7, one end of which is provided with an opening for the reception of a link 8, which engages the clevis 6, the opposite end of said bar being recessed, as indicated at 9, and provided with a longitudinally-disposed guiding-slot 10, in which is slidably mounted a rack-bar 11. The rack-bar 11 is adjusted vertically to raise or lower the load by means of a lever 12, the socket 13 of which is bifurcated, as shown, and provided with alined openings 14, adapted to receive a bolt 15, said socket being pivotally supported on the bar 7 by means of oppositely-disposed depending links 16, one end of each of which is pivoted to said bar, as indicated at 17, and the opposite end thereof secured to the socket 13 by the bolt 15. The socket 13 is provided with a terminal pin 17, adapted to engage the teeth 18 on the rack-bar 11 when the lever 12 is depressed, that portion of the bar 7 opposite the recess 9 being curved or bowed, as indicated at 19, so as to permit the socket 13 to be swung laterally, and thereby disengage the pin 17 from the teeth on the rack-bar in operating the.device. As a means for looking the rack-bar preparatory to taking a new grip on the same I provide a latch or lockingpin 20, slidably mounted on the lower portion of the bar 7 and retained in position thereon by guiding-pins 21. The latch 20 is provided with an intermediate web 22, adapted to engage the teeth on the rack-bar 11 when the free end of the lever is in the elevated position, said 'web being forced into engagement with the teeth'by a preferably leafspring 23, secured to the bar 7 and engaging one end of the latch, as shown. On the oppositeside from the spring 23 is pivoted a spring-lever 24, one arm 25 of which projects toward the end of the socket 13, while the opposite arm 25 hangs down by the latch 20. When the spring-lever 24: is in the position shown by dotted lines in Fig. 2 of the drawings, it has no effect on the latch 20; but when moved into the position indicated by full lines, with the arm 25 engaging the notch 26 in the latch, the lever 12 when depressed will engage the arm 25 and throw the latch out of engagement with the teeth, thereby permitting the rack-bar to be adjusted.

Secured to the lower end of the bar 11 is a ring or link 27, to which is fastened in any suitable manner one end of a chain, rope, or other cable 28 for attachment to the stump, rock, or other article to be extracted.

In operation the rack-bar 11 is allowed to slip down as far as may be necessary to connect it with the stump or other object and the chain or cable made fast to the same. The lever 12 is now operated, so as to cause the pin 17 to engage the teeth on the rack-bar and raise said bar. As the rack-bar is raised each tooth pushes the latch laterally, and when the teeth pass the web 22 spring 23 forces said latch back into engagement with the teeth, so as to hold said bar in the position to which it is raised, while the lever 12 is operated to engage a tooth lower down on the bar. When the rack-bar is lowered to take a new hold, the spring-lever 24 is arranged so-that the arm 25 will bear against the end of the latch, and when said lever is depressed theend of the socket Will engage the springarm 25, causing the arm 25 to engage the end of the latch and move the same laterally, thereby permitting the rack-bar to drop to the position required.

Having thus described the invention, what is claimed is l. The combination with a supporting-bar havingone end thereof curved or bowed, of a rack-bar slidably mounted on the supportingbar, an operating-lever pivotally mounted on said bar and having its bifurcated end portion spanning the curved or bowed portion thereof, a'pin carried by the lever and adapted to engage the teeth on the rack-bar for adjustingthe latter, and a spring-pressed latch for lockingsaid rack-bar in adjusted position.

2. The combination with a supporting-bar provided with a terminal recess and having a longitudinally-disposed guiding-slot commu nicatingtherewith one of the side walls of said recess being curved or bowed laterally, of a rack-bar slidably mounted in said guiding-slot, an operating-lever pivotally mounted on the supporting-bar and having its bifurcated end spanning the curved or bowed portionthereof, a pair of links, one end of each of which is pivoted to said supporting-bar, a pin or bolt forming a pivotal connection between the opposite ends of said links and the operating-lever, a sliding latch mounted on the supporting-bar and adapted to engage the rack-bar, a spring secured to the supportingbar and engaging one end of the latch, and a spring-lever pivoted to said supporting-bar for engagement with the opposite end of said latch and the operating-lever, respectively.

3. The combination with a supporting-bar provided with a terminal recess and having a longitudinally-disposed guiding-slot communicating therewith, one of the side Walls of said recess being curved or bowed laterally, of a rack-bar slidably mounted in said guiding-slot, an operating-lever pivotally mounted on the supporting-bar and having its bifurcated end spanning the curved or bowed portion thereof, a pair of links, one end of each of which is pivoted to the supporting-bar, a pin or bolt forming a pivotal connection between the opposite ends of said links and the operatingelever, a transverse shoulder formed on the end of the supporting-bar, laterally-projecting pins spaced from said shoulders, a latch slidably mounted between the shoulder and the projecting pins and adapted to engage the rack-bar, a spring secured to the supportingbar and engaging one end of the latch, and a spring-lever pivoted to said supporting-bar for engagement with the opposite end of said latch and theoperating-lever, respectively.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence'of two witnesses.

WILLIAM HARRISON WRIGHT.

Witnesses:

GEO. P. MUNSEY, O; J. GEORGE.

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