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Publication numberUS3034660 A
Publication typeGrant
Publication dateMay 15, 1962
Filing dateApr 3, 1959
Priority dateApr 3, 1959
Publication numberUS 3034660 A, US 3034660A, US-A-3034660, US3034660 A, US3034660A
InventorsCarl Rau, Rau Edward A
Original AssigneeCarl Rau, Rau Edward A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Trailer mounted folding derrick with telescoping boom
US 3034660 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

May 15, 1962 E. A. RAU ET AL 3,034,660

TRAILER MOUNTED FOLDING DERRICK WITH TELESCOPING BOOM Filed April 5, 1959 2 Sheets-Sheet l INVENTORS Edward H- RGO By Carl fi'au May 15, 1962 E. A. RAU ETAL 3,034,660

I TRAILER MOUNTED FOLDING DERRICK WITH TELESCOPING BOOM Filed April 5, 1959 2 Sheets-Sheet 2 INVENTORS Edward 17- Raw I BY Carl Raw HTTZRNEY United States. Patent 3,034,660 TRAILER MOUNTED FOLDING DERRICK WITH TELESCOPING BOOM Edward A. Rau and Carl Rau, Hudson, S. Dak. Filed Apr. 3, 1959, Ser. No. 804,038 1 Claim. (Cl. 212-46) Our invention relates to a trailer mounted folding derrick with telescoping boom.

An object of our invention is to provide a derrick which can be folded for transporting purposes, and which can then be elevated to its full length, with the derrick also including a telescoping boom which can be extended fully thereby effecting a greater offset and heighth to the boom and derrick.

A further object of our invention is to provide a derrick of this type which can be folded or elevated very easily.

A further object of our invention is to provide a special locking arrangement for locking the derrick in its raised position.

A further object of our invention is to provide winch control means which are easily accessible to the operator.

A further object of our invention is to provide an arrangement for pulling water pipes or pumps and for loading and unloading farm machinery, etc.

With these and other objects in view, our invention consists in the construction, arrangement, and combination of the various parts of our device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in our claim, and illustrated in the accompanying drawings, in which:

FIGURE 1 is a side elevation of the raised derrick,

FIGURE 2 is an enlarged view taken along the lines 2--2 of FIGURE 1,

FIGURE 3 is an enlarged sectional view taken along the lines 3-3 of FIGURE 5,

FIGURE 4 is an enlarged sectional view taken along the lines 44 of FIGURE 3, and

FIGURE 5 is a rear view, with parts removed.

Our invention contemplates the provision of a portable derrick which includes certain features for telescoping and extending the derrick, together with other features.

We have used the character to designate a base framework which can be pivotally secured at 11 to a tractor drawbar 12, the character 13 indicating a pair of .side Wheels for transporting the arrangement, the wheels being journalled on the shaft 14 which is attached to the beam 15 (see FIGURE 5). We have further used the character 16 to indicate bracing members which are secured at 17 to the inclined members 18 which are attached to the base 10, the character 19 indicating further vertical supports or members which are also attached to the base 10, and attached across the members 18 and 19 are the longitudinally positioned braces 20, the character 21 indicating a further brace, the character 22 indicating bracing rods. It will be understood that there are a pair of members 18 and a pair of members 19 to provide the substantially square in section arrangement, and hinged at 23 to the members 19 are the further angularly positioned members 24 which are attached to the braces 25, which braces are attached to the further pair of members 26, the character 27 indicating a pair of lower braces, the character 28 indicating further bracing bars. Attached to the top of the members 24 and 26 is the top piece 29 which is adapted to slidably receive at 30 the lengthened boom 31 to which are attached the end flanges 32 between which is journalled the pulley 33 over which passes the cable 34 which is attached to a stop member 35.

Attached to the lower end of the boom 31 is the pulley 36 over which passes a cable 37 which is secured at 38,


this cable passing over a further pulley 39 which is secured at 39a, the cable 37 thence passing downwardly and being wound upon a winch 40 which is secured to the bracket 41 (see FIGURE 2) and attached to the winch 40 is a ratchet 42 which engages a pawl 43, which pawl is secured at 44 to the bracket 41, the winch being operated by means of the shaft 45 which is attached to to the handle 46. Attached at 47 to one of the members 24 is an arm 48 to which is attached at 49 the spring 50 which is secured at 51,to the member 19.

The character 52 designates a further winch similar to the winch 40 and having a similar ratchet and other arrangements, and wound upon this winch is a further cable 53 which passes over a pulley 54 which is attached to the member 18, the cable thence passing over a further pulley 55 which is attached to the brace member '27, the cable 53 thence being secured at 56 to the member 20.

The cable 34 after passing over the pulley 33 passes over a further pulley 57 which is secured adjacently to the member 20, the cable 34 thence being wound upon the reel 58 which is driven by means of a suitable gas engine 59.

The character 60 indicates a transverse rod to which is attached a pair of bars 61 (see FIGURES 3, 4 and 5) which bars have the extending portions 62 which are adapted to engage over the transverse bar 63 when in the locking position, the bar 63 being attached across the members 26. The transverse rod 60 is attached to a lever 64 to which is attached at 65 the downwardly hanging cable 66 which is adapted to operate the locking arrangement, the character 67 (see FIGURE 4) indicating a torsion spring which normally keeps the bars 61 in closed position until locked by the mechanism to be described.

The character 68 indicates a lengthened bar or lever which is pivotally attached at 69 to the piece 70 which is attached to one of the members 20, this lever 68 including the extending portion 71 which is adapted to lock over one of the bars 61 when the derrick is to be locked in its erected position, and attached at 72 to the bar 68 is the spring 73 which is attached at 74 to the further member 20 (see FIGURE 4).

Attached at 75 to the end of the bar 68 is the cable 76 which passes over the pulley 77 which is attached to the support 78 which is attached to the member 20, the cable 76 passing downwardly to provide control from the ground. The derrick is operated in the following manner.

For transporting the derrick, the locking bars 61 are first released by pulling downwardly on the cable 76 which pulls the lever 68 to the left as viewed in FIGURE 4, which releases the portion 71 from one of the bars 61, whereby the upper portion of the derrick comprising the members 24, 26, etc. will be released, the springs 50 meanwhile providing a counter-balancing effect to additionally support the upper member, and next the winch 52 is rotated which through the agency of the cable 53 passing over the pulleys 54 and 55 will allow the upper derrick portion to gradually gravitate, since it is overbalanced, to the dotted position shown in FIGURE 1, whereupon the derrick can be held in this position by means of the rods 79 which can be secured to the member 19 and to the derrick upper portion. In this position the derrick can be moved from place to place by means of the tractor or other vehicle. In the converse manner and by reversing the winch 52 the derrick can be raised to its upper position and re-locked in such upper position by means of the lever 68, bars 61, etc. If it is desired to extend the boom 31 upwardly to increase the offset and effective length of the derrick, the winch 40 is rotated which through the agency of the cable 37 passing over the pulleys 39 and 36 will then force the boom 31 upwardly and outwardly, the ratchet on the winch secur- 3 ing the same in any desired position, and in this way the boom can be extended angularly upwardly.

For releasing the boom to its collapsed inner position, the Winch can be reversed until the stop member 35 abuts against the pulley 33 and the end of the boom which will cause the entire boom to be pulled downwardly and inwardly.

The reel 58 which operates the cable 34 is used for pulling pipe or raising equipment, etc., the lower end of the cable 34 including any desired attaching means.

It will thus be noted from the foregoing description that our device provides the advantages mentioned in the objects of our invention with further advantages being readily apparent.

Some changes may be made in the construction and arrangement of the parts of our invention without departing from the real spirit and purpose of our invention, and it is our intention to cover by our claim any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

We claim as our invention:

A trailer mounted derrick comprising a lower derrick portion, an upper derrick portion hinged to said lower portion, said upper portion being angularly offset with respect to said lower portion, said upper derrick portion including a telescoping lengthened boom slidably engaged therewith and upwardly extensible with respect thereto,

a rotatable winch, a cable wound upon said winch attached to said lower portion, a pulley mounted at the lower end of said boom, an upper pulley attached to said upper derrick portion, said cable passing over said pulleys and being secured to said upper portion, means for permitting said upper derrick portion to gravitate normally downwardly including a further releasable winch secured to said lower portion, a cable attached between said further winch and said upper derrick portion, a spring counter-balance secured to said lower derrick portion and said upper derrick portion, means for locking said upper derrick portion to said lower derrick portion including a pair of arms pivoted to said lower portion, said arms having inwardly extending ends, said upper portion including a transverse bar over which said ends engage, means for locking said arms, including a lever pivoted to said lower portion, said lever including a portion at right angles thereto for engaging one of said arms.

References Cited in the file of this patent UNITED STATES PATENTS 1,380,591 Quet June 7, 1921 2,025,284 Huot Dec. 24, 1935 2,885,799 Le Tourneau May 12, 1959 FOREIGN PATENTS 1,022,778 Germany Jan. 16, 1958

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1380591 *Mar 25, 1919Jun 7, 1921Francois QuetPortable lifting apparatus
US2025284 *Dec 28, 1934Dec 24, 1935Huot Leo EdmondHoisting crane
US2885799 *Apr 4, 1956May 12, 1959Letourneau Robert GTree felling machine
DE1022778B *Nov 29, 1954Jan 16, 1958Krupp Ardelt GmbhAuf einem Schlepper aufgesattelter Schwerlast-Autokran
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3161299 *Mar 21, 1963Dec 15, 1964Potain & Cie Ets FFolding tower crane
US4024957 *Jul 25, 1975May 24, 1977Northwest Engineering CompanyCrane with foldable boom
US5480041 *Jun 27, 1994Jan 2, 1996Turner; Eugene M.Trailer-mounted crane
US5829605 *Jul 8, 1997Nov 3, 1998Poitras; Hermel G.Mobile crane towable by a pickup truck
U.S. Classification212/299
International ClassificationB66C23/00, B66C23/34
Cooperative ClassificationB66C23/344
European ClassificationB66C23/34D