US1949750A - Derrick structure and method for raising a derrick mast - Google Patents

Description

:March 6, 1934.-

G. R. LUNT El AL DERRICK STRUCTURE AND METHOD FOR RAISING DERRICK MAST Filed Jan. 11, 1932 2 Sheets-Sheet l @EEELCZJ HQBQO R U ET AL L94fi$ DERRICK STRUfiTURE AND METHOD FOR RAISING A DERRICK MAST Filed Jan. 11, 1932 2 Sheets-Sheet Patented Mar. 6, 1934 DERRICK STRUCTURE AND IVIETHOD FOR RAISING A DERRICK MAST Gordon R. Lunt and Cedric Fegtly, Des Moines, Iowa, assignors to Pittsburgh Des Moines Steel Company, Des Moines, Iowa, a corporation Application January 11, 1932, Serial No. 586,062

9 Claims.

Our invention relates to a derrick structure and to a method for raising the mast thereof.

It is the purpose of our invention to provide a derrick structure, particularly adapted for quickly, inexpensively and easily raising the mast thereof, after it has been assembled in a horizontal position adjacent the location where it is to be erected.

Another purpose is to provide a simple method whereby a derrick mast. may be quickly and easily raised in a short time with a minimum of labor.

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 claims, and illustrated in the accompanying drawings, in which:

Figure l is a diagrammatic side elevation of a derrick structure showing it in one position during the starting stages of the derrick mast rais ing operation which is carried on according to our method.

Figure 2 is a sectional view on the line 2-2 of Figure 1 showing a position retaining means.

Figure 3 is a diagrammatic side elevation showing further stages in the derrick mast raising operation.

Figure 4 is a side elevation'of the derrick in erected position.

Figure 5 is a rear elevation of the lower end of the derrick mast showing cribbing and jacks supporting the mast.

Figure 6 is a plan view of the same on the line 66 of Figure 5.

Figure '7 is a side elevation of Figure 5; and

Figure 8 'is a similar side elevation showing a slightly difierent method for finally setting the derrick mast in position.

' On the accompanying drawings, we have used the reference character A to indicate a derrick mast and the reference character B to indicate a derrick boom. The mast and boom are of any suitable kind, preferably fabricated of steel.

The mast A has at its lower end a mast base 10 adapted to fitiin a derrick base 12 when the derrickis in erected position. Bed pieces 13 or any suitable foundation are usually provided for the derrick base 12. The derrick base itself usually has brackets 15 supporting cable sheaves 17 under which the various cables for operating the derrick extend. This is all part of the derrick construction and does not need to be further described.

The boom B is comprised of boom sections or members 14, 16 and 18. The boom member 14 is pivoted by means of a pin 20 to gusset plates 22 which are secured to the lower end of the mast A.

.In the practice of our method, the ordinary derrick construction thus far described is modifled as will now be described. Gusset plates 24 are secured to the lower end of the mast A and extend (relative to the axis of the mast) in an opposite direction from the gusset plates 22. The gusset plates 24 are provided with openings 26 to receive a pivot or cross shaft 28 which may be an extra heavy pipe or the like. Cribbing 30, 32, 34, 36 and 38 as well as jacks 40, trunnions 42, blocks 44 and shims 46 are used in conjunction with the pivot shaft 28, in conection with the practice of our method.

Also in the practiceof our method a hoist or winch 48 is used having cable drums 50 and 52 for cables 54 and 56, respectively.

The cable 54 is connected with the boom member 14 and the cable 56 extends through pulley blocks 58 and 60. The pulley block 58 is connected with a cable 62, while the pulley block 60 is connected with a dead man or anchor 64. A cable 55 is provided for limiting the boom member 14 and the mast A to a predetermined angular position with relation to each other.

The cable 62 is preferably doubled-that is, it has one end secured to the mast A, as for instance to an ear 66 thereon, with the intermediate part of the cable extending to the pulley block 58 and then back again and with its other end secured to the mast A. The intermediate part of the cable 62 extends over the upper end of the boom member 14, as shown in Figure 1 by full lines, it merely contacting with the upper end thereof, A short metal bar 68 may be secured to each side ofthe boom member 14 to prevent the cable 62 from sliding sidewise ofi the end of the boom member.

Guy cables 70, '72 and '14 for the mast A are provided in the ordinary manner, these being connected with a spider 76 at the upper end of the mast and being adapted for connection with dead men '78, 80 and 82, respectively. The guy cables 70 extend sidewise from the mast, the guy cable 72 extends rearwardly therefrom and the guy cable '74 extends forwardly therefrom.

During the raising operation for' the mast, block and tackle take-up devices 84 are preferably interposed between the dead men 78 and the guy cables 70; y

In connection with our raising method we further provide a position retaining cable 86 having its ends connected with the pivot shaft 28 and its intermediate portion with a dead man 88. Turn buckles or otherItake-up devices are interposed in the length of the cable 86 for adjustment purposes.

Description of method for raising the derrick mast Having described a ,derrick structure with modifications which adapt it for our method, we

will now describe the method itself step by step. (1) The bed pieces 13 are accurately located and leveled and the derrick base 12 is supported thereon in final desired position.

(2) Dead men or anchors '78, 80, 82 and 88 are all located, with the dead man 88 directly .under the position from which the mast is to be raised. If soil conditions require it, two dead men 88 may be used instead of the single one. When two are used, they are located on opposite sides of the mast about four or five feet apart.

(3) The mast A is assembled on the ground as near as possible to the position from which it is to be raised.

(4) With the pivot shaft 28 in place, the base of the mast A is jackedip or otherwise raised until the shaft 28 is in the proper relative position to the derrick base 12.

(5) The cribbing 30, 32, 34, 36 and 38 together with the shims 46 are then placed in po 'sition and the blocks 44 nailed on the cribbing 38 to positively position the shaft 28 nally of the cribbing 38.

Thereafter the jacks are removed and the mast is leveled to the horizontal position shown in Figure 1 by raising the upper end of the mast and by the use of cribbing 92.

(6) The position retaining cable 86 is then placed in position for holding the shaft 28 against displacement, the turn buckles 90 being tightened to draw the cable 86 substantially taut.

('7) The guy cables '70, '72 and '74 are then secured to the spider '76 and to the dead men '78 and 80.

(8) The boom member 14 is then pinned in position, it resting horizontally on the mast A as shown by dotted lines in Figure 1.

(9) The cable 62 is then assembled in the dotted line position of Figure 1, the cables 54, 55 and 56 also being assembled in their dotted line position. The bars 68 are secured in position on the upper end of the boom member 14.

(10) The cable 54 is then wound in to raise the boom member 14 from its horizontal dotted position to its vertical full line position of Figure 1. The cable 55 is of the proper length to limit the angle between the boom member and the mast to substantially a right angle.

(11) The cable 56 is then wound on the drum 52 to first tighten the cable 62 and then start swinging the mast and the boom about the pivot shaft 28, as for instance to the solid line position of Figure 3, the drum 50 during the raising operation being manipulated to keep the slack out of the cable 54. 1

Soon a ter the position of Figure 3 is reached the cable 62 will cease contacting with the outer end of the boom member 14 and pull directly on the mast A as shown by dotted lines in Figure 3. This arrangement provides for proper leverage of the raising cable 56 on the mast A, both while it is in its horizontal position and while it is adjacent its vertical position. During the raising operation, the block and tackle devices 84 longitudi- I aremanually manipulated to keep the side guy cables 70 taut to prevent any side toppling of the mast A. a

' (12) When the mast finally assumes its vertical position as shown in Figure 4, the jacks 40 are positioned on the cribbing 33 and support the trunnions 42 under the pivot shaft 28. The jacks may then be manipulated for raising the shaft off the cribbing 38, whereafter the shims 46 successively may be removed as the jacks are lowered for lowering the mast base 10 into the derrick base 12.

In some instances, especially on light derricks, the jacks 40 and trunnions 42 may be dispensed with as shown in Figure 8, the cribbing 38 being arranged low enough to allow the mast base 10 to roll into seating engagement with the derrick base 12 during the final portion of the raising of the derrick mast which raises the shaft 28'from the cribbing 38 as illustrated. Thereafter the shims and cribbing may be removed without the necessity of having to use jacks for releasing the cribbing and lowering. the derrick mast.

The process of lowering the mast is just the reverse of the raising process.

From the foregoing description it will be seen, that we have provided a method for raising a derrick mast which involves far less work and fewer operations and thus facilitates the raising of the derrick mast. One section of the boom is effectively used during the raising operation for providing the proper leverage to raise the mast from its horizontal position. Our method entirely eliminates the erection of a small temporary mast to be used for then erecting the larger permanent mast. The method just mentioned is the one now in common use.

Some changes in our means for supporting the pivot shaft on the derrick mast and changes in the steps of the method for raising the mast may be made without departing from the real spirit and purpose of our invention, and it is our intention to cover by our claims, any modified forms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

We claim as our inven'ion:

1. In a structure of the kind described, a mast, a lower boom section pivoted to the lower end thereof, an upper boom section being subsequently attachable to said lower boom section to form an extension thereof whereby the two form a boom of substantial length, means for fixing the mast and lower boom section in predetermined angular relation to each other, a cross shaft associated with the lower end of the mast, means for supporting the cross shaft and a cable connected with the mast and engaging the end of the boom member whereby pull on the cable moves the boom member and the mast around the axis of the cross shaft for raising the mast and the cable can leave the end of the boom member during the latter part of the raising movement.

2; In a structure of the kind described, a mast, a lower boom section pivoted to the lower end thereof, an upper boom section being subsequentouter end of said lower boom section, means for eaarso pivotally mounting the lower end of said mast, said raising cable contacting only with said outer end of said lower boom section-whereby pulling on said raising cable will swing said section and said mast around the pivotal mounting for said mast and in so doing, will leave said outer end of said lower boom section.

3. The method of erecting a derrick comprising pivoting a lower boom section to the lower end of a mast, supporting the lower end of the mast by means of a cross shaft with the mast lying substantially horizontal, raising the lower boom section, fixing the mast and the lower boom section in predetermined angular relation to each other and pulling a cable associated with the lower boom section from a position spaced from the lower boom section in a direction opposite the mast to rock the boom member and the mast on a common pivot for raising the same.

4. The method of raising a derrick comprising pivoting a lower boom section to the lower end of a derrick mast, fixing a cable to the mast and to the lower boom section at points spaced from the pivot of the lower boom section' to the mast, raising the lower boom section until said cable is taut, imparting pivotal movement to the lower boom section and the mast for raising the mast to vertical position and attaching an upper boom sectionto said lower boom section as a continuation thereof. 5. The method of raising a derrick comprising pivoting the lower boom section to the lower end of a derrick mast, fixing a cable to the mast and to the lower boom section away from the pivot of the lower boom section to the mast to limit their relative movement to 'a predetermined angular relationship, providing a common pivot for the lower boom section and the mast, imparting movement to the lower boom section and the mast to rock them around said common pivot for raising the mast to vertical position, attaching an upper boom section to said lower boom section whereby the lower and upper boom sections constitute a derrick boom and raising said derrick boom to operating position.

6. The method of raising a derrick comprising pivoting a lower boom member to the lower end of a derrick boom mast, fixing a cable to the mast and to the lower boom section spaced from the pivot of one to the other to limit their relative movement to a predetermined angular relation, providing a common pivot for the lower boom section and the mast, fixing a second cable to said mast intermediate its ends, extending the 1 second cable over the outer end of the lower boom section and pulling on said second cable to rock said lower boom section and said mast around said commonpivot and tocause said second cable to leave said lower boom sectionfor vthe purpose of raising the mast.

7. The method of raising a derrick from hori= zontal position comprising pivoting a lower boom section to the lower end of a mast, connecting a position retaining cable with the lower end of the mast, raising the lower boom section, limiting the angular relationof. the lower boom section to the mast and pulling a cable associated by contact with the outer end of the boom member and by connection with the mast, from a position spaced from the lower boom section in a direction opposite the mast for swinging the lower boom section and the mast around a common pivot and thereby raising the mast to vertical position, lowering the lower boom section to horizontal position, fastening an extension on the lower boom section and raising the lower a boom section and its extension to serve as a derrick boom.

8. In a structure of the kind described, a mast, a lower boom section pivoted to the lower end thereof on one side of the lengthwise axis of the mast, an upper boom section being subsequently attachable to the outer end of said lower boom section, a pivotal support for the lower end of said mast on the other side of said axis, a cable fixed to the mast and to the lower boom section at points spaced from the first mentioned pivot for limiting the angular movement lower boom section and the mast, means including a cable contacting only with the outer end .of the lower boom section and disengageable therefrom during the raising of the mast, whereby the lower boom section and the mast may be rocked about the second mentioned pivot for raising the mast and a scatter the lower end of the mast to engage in upon its assumption of such raised position. i i

9. In a structure of the kind described, a mast, a lower boom section pivoted to the lower end of said mast on one side of the lengthwise axis thereof, an upper boom section being subsequently attachable to the outer end of said lower boom section, a pivotal support for the lower end of said -cable on the other side of said axis, means for fixing the position of said pivotal support to retain it in a. desired position during raising of said mast, a cable fixed to the mast and to the lower boom section at points spaced from said first mentioned pivot for limiting its angular movement apart from said lower boom section and said mast, means including a cable engageable with and disengageable from the outer end of said lower boom section for rocking the boom member and the member about the second mentioned pivot'for raising the mast and a seat for assumption of such'raised position.

GORDON R. LUNT. CEDRIC FEG'ILY.

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