US742995A - Derrick. - Google Patents

Description

No. 742,995. 'PATENTED NOV. 3, 1903.

s. JACOBS,

DERRICK.

APPLICATION FILED JAN. 28. 1903.

N0 MODEL.

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UNITED STATES Patented November 3, 1903;

PATENT OFFICE.

WILLIAMS. JAc'oBs, or MALDEN, MASSACHUSETTS, ASSIGNOR on ONE-HALF TO WILLIAM E. WATERMAN, OF MALDEN, MASSACHUSETTS DERRICK.

SPECIFICATION forming part of Letters Patent No. 742,995, dated November 3, 1903. Application filed January 28. 1903. Serial No. 140,848. (No model.)

To all whom it may concern:

Be it knownthat 1, WILLIAM s. JACOBS, (if

which I will now proceed to describe and claim.

Of the accompanying drawings, forming at part of this specification, Figure 1 represents a side elevation of a derrick embodying my invention applied to the rear end of a cartbody. Fig. 2 represents a rear elevation of the same, showing the weight in an elevated position. Fig. 3 represents a side elevation showing the derrick engaged with a stone boat or drag. Fig.4 represents a side elevation of the derrick detached. Fig. 5 represents a section on line 5 5 of Fig. 4.

The same reference characters indicate the same parts in all the figures.

My improved derrick comprises an arm n corresponding to the boom of a derrick, an elongated strut b, pivotally connected with the outer or swinging end of the arm, and an operating-lever 0, also pivotally connected with the outer orswinging end of the arm.

The inner end of the arm is adapted to be fulcru med on a suitable support, such as cartbodyd or a stone-boat or drag d. The strut b is so connected with the arm that it is free to swing downwardly, but is locked to the arm against independent upward motion, the arrangement being such that when the arm a is swung upwardly the strut b will swing downwardly and bear on the ground, the strut being locked to the arm after each downward movement, so that the strut supports the arm at any height to which it may be raised. The operating-lever o is also connected with the arm in such manner that it can swing downward independently,but is locked to the arm against independent upward movement. Consequently when the lever is swung downwardly it engages the arm at the end of its downward movement, so that when swung upwardly it is locked to the arm and the arm moves upwardly therewith. It will be seen,

therefore, that when a body 6, which is to be 5 lifted and transferred to the support d or d or to any other desired support, is suspended from the outer end of the arm a, the arm, with said body, may be swung upwardlystep by step by oscillating the lever a, each upward movement of the lever raising the arm and weight, the strut retaining the arm and supporting it at any height to which it may be raised.

The arm a ispreferably substantially U- shaped, and therefore has end portions 2 2, connected by a central portion 3, the latter constituting the outer end of the arm. The inner ends of the side portions 2 2 are adapted to be fulcrumed on the support d or d, and

they may be pivoted to said support or may rest loosely thereon. I have here shown said end portions as branched or forked to form on each two feet 4 4, either of which may rest upon the support d. The central por- 7 tion 3 may be provided with one or more hooks 5, from which the body to be moved may be suspended.

The preferred means for connecting the strut b and operating-lever c with the arm pawls is such that the strut b and lever care locked to the accompanying pawls and to the arm a against movement in an upward direction, said strut and lever being free to swing downward independently.

It will be seen that the described apparatus constitutes a simple and convenient portable derrick, particularly adapted for use in connection with wagons, although capable of use in any relation in which a weight is to be lifted and transferred. As indicated by full and dot- 10o ted lines in Fig. 1, the weight is raised from the ground by the described apparatus until The strut b 85 the arm areachesa vertical position the weight being then elevated above the support on which it is to be deposited. After this the .weight may be readily landed on the support ond, when the arm a reaches avertical position all the branches bear on the support, so that thearm is self-sustaining and will not tip either forward or backward until pushed or forced by the operator.

The parts a and 0 may be considered as conjointly forming a lever of the second class, provided between the fulcrum end and the power-receiving end with a pivoted trailing dog (the strut b) and also provided with adjustable connections (the ratchet g and pawl 19) between the said lever and dog, said connections enabling the dog to retain the lever at various elevations. The said parts a and 0 may be also considered as a jointed 'or sectional lever of the second class, the

outer section of which (the part c) has an adjustable connection with the inner section (the part a) to enable the outer section to assume operative positions at various angles with the inner sections.

The arm'a, including the central portion 3 and side portions 2 2, is preferably made from a rod or bar of iron or steel, which is rectangular in cross-section, as shown in Fig. 5.

In Fig. 4 the central line extending along the parts 2 2 and 3 indicates one of the angles of the bar. 'In Fig. 2 said central line is omitted, owing to the reduced scale on which Fig. 2 is drawn. Fig. 2 shows each of the parts 2 2 integral with the part 3, while Fig. 4 shows one of the parts 2 integral with the part 3, the other part 2 being made in a separate piece and secured to the part 3 by a set-screw.

I claim 1. A derrick comprising an arm adapted to be fulcrumed at one end on a vehicle or other support, an elongated strut mounted to swing on the swinging end of the arm, connections between the strut and arm whereby the strut is locked to the arm against independent movement in one direction while free to swing in the opposite direction, an operating-lever pivotally mounted on said swinging end, and connections between the lever and arm whereby the lever is locked to the arm against in dependent movement in one direction while free to swing independently in the opposite direction.

2. A derrick comprising asubstantially U- shaped arm the end portions of which are adapted to be f ulcrumed on a vehicle or other support, ratchets affixed to the central portion of said arm, a strut pivotally connected to the said central portion and having a pawl engaging one of the ratchets, and an operating-lever also pivotally connected with the said central portion and having a pawl engaging the other ratchet.

3. A derrick comprising a U-shaped arm, the end portions of which are forked, the branches of the forked ends being adapted to bear either in pairs or simultaneously on a support, an elongated strut mounted to swing on the central portion of the arm, connections between the strut and arm whereby the strut is locked to the arm against independent movement in one direction while free to swing in the opposite direction, an operating-lever pivotally mounted on said swinging end, and connections between the lever and arm, whereby the lever is locked to the arm against independent movement in one direction while free to swing independently in the opposite direction.

4. A derrick comprising a lever of the second class, provided between the fulcrum end and the power-receiving end with a pivoted trailing dog or strut, and connections between said lever and dog having provisions for supporting the lever at various elevations.

5. A derrick comprising a lever of the second class, having an inner fulcrum-section and an outer power-receiving section jointed to the inner section, connections between said sections having provisions for enabling the outer section to engage the inner section at various angles with the latter, and means for supporting the inner section of the lever at various heights.

In testimony whereof I have affixed my signature in presence of two witnesses.

WILLIAM S. JACOBS. Witnesses:

WILLIAM E. WATERMAN, G. F. BROWN.

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