US1135799A - Derrick. - Google Patents

Description

D. F. HOGAN.

DERRICK.

APPLICATION FILED MAR. I6. I9I4.

Patented Apr. 1", 1915.

THE MORRIS PETERS C0., F'HomLITHo WASHINGTON, D. c.

UNFFF@ @VFA :DEER/K.

Specification of Letters Patent.

Patented Apr. 13, 19115.

Application fued March 1e, 1914.. serial No. 824,989.

` To all ywhom t may concern Be it known that l, DENIS F. HOGAN, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful llmprovements in Derricks; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an improved derrick, and to such ends, generally stated, the invention consists of the novel devices and combination of devices hereinafter described and defined in the claims. I

The improved derrick hereinafter described, while capable of a more general use, is, nevertheless, especially adapted for use as a portable derrick to be carried, for eX- ample, on a supporting car or truck.

ln the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a view partly in side elevation and partly in vertical section showing the improved derrick; Fig. 2 is a front elevation showing upper portions of the derrick, other portions being broken away; and Fig. 3 is a detail-in section on the line m3 x3 on Fig. 2.

As a traveling support for the derrick, 1 preferably employ a sort of a truck, the body of which is in the form of a box-like shell 1, provided with truck wheels 2 adapted to run upon rails 3. The box or body 1 is filled with concrete 4; into lwhich the casing or relatively Xed outer portion of a derrick mast is embedded in a manner which will be presently described. The car body 1 is shown as provided with an operators platform 5 secured to one side thereof, and is also shown as provided with brackets 6 to which arms 7 are adapted to be rigidly but detachably secured by bolts 8, or other suitable means. The arms 7 may be applied to either or both sides of the car'and engaged with the ground or an object placed on the ground, to increase the stability of the car. 11i this improved derrick, the mast is supported entirely from its lower end, and it is made up of a relatively fixed tubular casing and a relatively movable or rotary mast telescoped thereinto. rThe mast casing is preferably made up of a heavy metal tube or pipe 9 that is reinforced by a larger or shorter metal tube or pipe 10 that surrounds the lower end portion thereof. rEhe lower end portions of the casing tubes or pipes 9 and 10 are extended downward within the car box 1, are embedded in the concrete 4L and are telescoped onto the hub of a metallic bearing step 11 that rests on the bottom of 'the said box. Metallic reinforcing rings 12 and an annular bearing 13 surround the outer pipe 10 and are embedded in the concrete 4 with the upper hub portion of the said bearing 13, projecting slightly above the concrete. The numeral 14- indicates tie bolts which connect the upper ring 12 to the annular bearing 13 and the numeral 15 indicates similar tie bolts that connect the lower ring 12 to the flange of the bearing step 11. ln this way, the casing of the mast is very firmly anchored in the concrete, and

the said casing is made strong at a point where it projects above the concrete and where it is subject to the greatest bending strain. Also, the great weight of the concrete l gives such stability to the car that it will support the derrick when it is being used to lift heavy loads.

The stem of the mast is shown as made up of a pipe 16 and a pair of laterally spaced upright metal bars 17 rigidly secured to the upper end thereof. The pipe 16 is telescoped down through the casing pipe 9 and its lower end rests upon the step bearing 11. lts upper end is preferably made approximately square at 16n (see Fig. 3) and the bars 17, which are preferably channels, are engaged with this squared portion and riveted or bolted rigidly thereto. Guide sheaves 18 and 19 are journaled on bolts 18a and 19a, respectively, passed through the bars 17; and a third guide sheave 20 is anchored to the upper ends of the said bars 17 by means of a link 21.

rlhe boom 22, at its lower end, is pivoted to heavy bearing ring 23 that is journaled on the pipe 10 and rests upon the annular bearing 13. rlhe said bearing ring 23 is connected by a plurality of tie bars 24:, to an upper bearing ring 25, that is secured to the upper end of the pipe 16 of the mast stem, and, as shown, rests upon an annular bearing cap 26 secured on the upper end of the pipe 9. ln this way, the upper and lower bearing rings 23 and 25 are caused to rota together, and with the rotatable stem of the mast, and the boom is, therefore, of

course, carried by or caused to oscillate with the stem of the mast.

A cable guiding sheave 27 isjournaled to the boom 22 below its free end, and two cable guiding sheaves 28 and 29 are connected to the outer end of thesaid mast,

` respectively, by sheave supporting links 28a and 29a. Mounted on one or more of the tie bars 24 that are at the back of the mast, are two independently driven or operated windlass drums 8O and 3l, to which, respectively, operating cables 32 and 33 are attached. The cable 32 controls the raising and lowering movements of the boom, and it is run from the drum 30 over the guide sheaves 1S, 29 and 20, and is attached to the link 29a. The cable 33 serves to raise and lower theload, and it is passed over the Vsheaves 19, 27 and 28 and under the sheave of the hook-equipped tackle block 34, and its vouter end is attached to the said tackle block.

This improved derrick as is evident, is free to rotate completely around from one position to another and to work at either side or end ror the carrying truck or supporting car. The derrick is therefore especially adapted for use' where a portable derrick is required, either for lifting loads at diiigerentpoints, or for lifting and carrying loads from one place to another.

What I claim is:

1.7In a derrick, the combination with a lrelatively fixed mast casing and aY mast rotatably mounted therein and projecting above the same, of lower and upper bearing rings, the former being pivotally mounted on 'said mast casing and the latter being secured to said mast, connections between the said upper and lower bearing rings for causing the same to rotate therewith and with the mast stem, a boom pivotally connected to said lower bearing ring at its lower end, Vcable guides on said boom and mast stem, and cables and operating devices for lifting the load and for raising and lowering said boom.

2. The combination with a relatively fixed mast casing and a mast rotatably mounted therein, said mast having a biurcated upper end portion and cable guiding sheaves journaled therein, of a lower bearing ring rotatably mounted on said mast casing and connected to rotate with said mast, a boom pivotally connected to said lower bearing ring at its lower end, cable operating drums and support therefor connected for rotary movements with said mast and lower bearing ring, and operating cables extending from said drums over the guide sheaves on the upper end of said mast and connected to the said boom, the one cable serving to raise and lower` the boom and the other to raise and lower the load from the boom.

3. The combination with a body of concrete, oi a step bearing embedded in the lower portion thereof and an annular bearing set into the upper portion thereof, a mast casing Vembedded in said concrete and extending from said step bearing through said annular bearing, a mast rotatably mounted in said casing with its lowei` end resting on said step bearing, a lower bearing ring rotatably mounted on said casing and resting on said annular bearing, a boom pivot-ally connected at its lower end to said lower bearing ring, connections for causing said lower bearing ring to rotate with said mast, and cables and cable operating drums and guides, one ot' said cables serving to raise and lower said boom and the other to raise and lower the load from said boom.

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

DENIS F. HOGAN.

Witnesses:

BERNIER G. wWHEELER, HARRY D. KILGORE.

Copies of thisl pat'eiitmayv be obtained for ve cents each, by addressing the Commissioner of Patents,

f Washington, D. C.

Images