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Publication numberUS1502989 A
Publication typeGrant
Publication dateJul 29, 1924
Filing dateJun 25, 1921
Priority dateJun 25, 1921
Publication numberUS 1502989 A, US 1502989A, US-A-1502989, US1502989 A, US1502989A
InventorsHeffron Amos S
Original AssigneeHeffron Amos S
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Stiff-leg derrick
US 1502989 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

MY 2 9 g2,

A- 5. HEFFRQN STI-FF LEG QERRICK Filed June 25r ).921 5 Sheets$heet l IA VENTOR 7 Ul/m Hfs ATTORNEY.

juy 29 m2@ A. s. HEFFRQN STIFF LEG DERRCK Filed June 25 1921 5 sheets-sheet 2` i V'VENTOR.

Juny 29 www L 1159298@ A. S. HEFFRON STIFF LEG DERRICX l Filed Jun@ 25 1921 5 Sheets-Sheet 4 @mw im ricks of like character made j my invention.

Patented `italy 29, i924.



Application ined nur@ 25,1921. serial110.480,410.Y

To all 'whom t may concern.:

Be it known that I, AMos S.fHnFFr.oN,

a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State-of Pennsdvania, have invented certain new and useful Improvements in Stiff-Leg Derrioks, of which the following is a specication.

One object of my invention is to provide an improved stiff leg derrick which can be more easily and conveniently used than derpreviously to Another object of my invention is to provide a'stiti1 leg derrick in which its boom can operate at any position within a radius of .practically 360 and at the same -time the derrick willbe entirely self-supporting without the use of any guy tackle.

A further object is to so construct my improved derriokfthat it can bequiekly and easily assembled and' erected and provide a stift leg derrick which is entirely self-supporting and .free of guy tackle. Another object is to' so construct my improved derrick that it can be used more ad-V vantageously owing to the arrangement of its parts'so that it canbe bodily shifted without the necessity of loosening or changing any guy tackle and as such it can be advantageously used in the erection of buildings or other structures.

Another object is to make my improved derrick lof a durable and comparativel f simple construction and so that theparts will be firmly held in operative position but can be easily disassembled.

A still further object is to provide a mounting for the operating cables so that they vwill not interefere with `the swinging action of the boom and will not be in the road of any material which is being lifted and conveyed from one position to another; the outlet or lead of the cables from the derrick to the hoisting apparatus being located in a. convenient position most desirable for the successful operation of the derrick.

how most of the `in dotted lines how-certain tain of the elements to suit various requirements, I* Y Figure 2 is a perspective view showingv parts of my improved derrick can be assembled when the structure is lying fiat on the ground as indicated by the full lines; said figure` also illustrating of the parts can' be swung into a position prior to. the tipv p ing of the structure into an upright position, y Y H Figure 3 is a perspective view showingl the structure after having been tipped into an upright position and prior to the attaohment of the boom,

Figure t is .a top plan viewof my improved derrick showing it in an operative position with `one of the lateral stiff legs` having been detached from the front transverse sill 'and swung into a position to permit the boom to swing i'n a' path between the front and rear sills at` one side of the structure,l j

Figure 5 is aviewof the same general 80 characteras that shown in Figure 4 illustrating the otherv of the lateral stiffl vlegs having been detached from the front sill an swung into a position to permit. the boom to swing into a position betweenthe front and rearsills at the` opposite side ofi the structure, Y. Figure 6 is a fragmentary elevation show-' ing the arrangement of the front or transverse sill having extensions which can be moved to increase the length of the front l sill and also illustrating rollers moved into a position vto facilitate the movement ofthe structure, said ligure being viewed from `the* rear of the sill, K 95 Figure 7 is a view of the same' general character as shown in Figure 6 illustrating the sill in its normal 'position with the extensions having been moved into their inner positions when notdesiredfor use,

Figure 8 is an enlarged fragmentary view of one end of the .structure shown in F ig` ure Figure 9 is an enlarged fragmentary elevation of a portion of the front sill vlewedilo from the roar illustrating the cable controlling'means and the mounting for the mast,

Figure l0 is a section taken on the line 10-10 of Figure 9,

Figure 1l is an enlarged front elevation 11o Figure 12 is a side elevation of saidmast, Figure 13 is rzr rear viewioi` a portion of tragnientarysection taken Figure 14 is a on the line 14-14 of Figure'4.

Referring to the drawings, derrick includes a `front transversely extending sill 15 which is made continuous from one end to the other and' includes two channels 16 and 17 which are spaced apart from front to rear. Top and bottomplates 18 and 19 are secured to the tops and bottoms ofthe channels 16 and 17 so as to enclose thespace 20 between the channels with the exception that opposite ends for a purpose hereinafter described. Two attachment or tishplates 18 and 19'a are secured respectively to the top and bottom of the front sill '15 and have portions which project forwardly and rear- -wardly of the front and rear sides of said sill; said attachment plates being preferably located centrally between the opposite ends of the sill 15. clearly shown in detail 13 and also illustrated in its assembled position in Figures 9 and 10, includes two upright standards 22 in the form ot channels which are spaced apart to provide an inner chamber 23. A filler sleeve 24 is secured by bolts between the standards 22 adjacent their rearends; jectingpivot nipple 24a which extends downwardly through tachment plate 18a and top plate 18respectively as clearly shown in Figure 10; said sleeve having its lower surface 27 bearing on the top surface of the plate 18?. A filler plate 28 is secured to the top of the sill 15 above the attachment plate 18a and has a hole 29 providing a lateral bearing torthe lside of the sleeve immediately above thesurface 29.

The iiller sleeve 24 has an annular` groove 30 in whichextend the inner edge portions of locking `plate-s 31; said locking plates` Aafter their inner portions have been inserted within the groove 30 at positions opposed to each other; being secured to the top sill above the iiller plate 28 by' bolts 32. Thus the filler sleeve' is free to rotate but is'locked 'against vertical movement to the sill 15.

I The nipple 24 extends into the space 20 formed within the sill 15 and the inner -pas- 'sage 33 ot said iller sleeve 24 communicates with the space 2O for a purpose hereinafter described. The filler sleeve 24 has a pair of earsI 34 which project' outwardly and form a pivotal connection tor the lower end of the boom 35; said boom being pivotally connected to said ears bya bolt or rod 36.

The upper end of the mast 21 has .a terminal block 37 secured between the channels 22; said terminal block terminating in a ny imprdved the space 2O is open at its` A mast 21, which isin Figures 11, 12 and said `filler sleeve having "a" pro-4 holes 25 and 26 in the attends the sleeve 38 of the mast 21.

sleeve 38 which projects above'the tops of the standards 22. The sleeve 38l has a portion 381L of reduced shoulder 39. A' head 40 is secured to the portion 38a of the sleeve 38"and abuts the shoulder 39. This head has ears 41 which are spaced apart and a pivot bolt 42 extends through the ears 41 and forms a bearing tor twov grooved pulley wheels 43 and 44 which are preferably made of dierent diameters,

as clearly.

shown in Figures 1l, 12 and 13.

diameter providing a,

T ne terminal block 37 and its sleeve portion 38 have an axial passage 45 which communi-l cates with the chamber23 between the han nels 22.-

rPhe rear channel 17 ot the front sill 15,

as shown in Figures 9 and 10, has an aperture 46. Directly in line with this aperture 46 and to the rear of the channel :17 are mounted two pairs of grooved pulley wheels 47 and 48; said pulley wheels being rotatably mounted on pivot pins 49 having rotatable bearings in brackets 50 and 51; the pivot pins 49 having heads in engagementl withthe upper bracket 50 so can be readily removed if desired. A bracket 52 within the space 2O of the sill 15 supports two pulley wheels 53 and 54. The pulleiv wheels 47 and 48 are adapted to r0- tate. in horizontal planes and the pulley wheels 53 and 54 rotate in vertical planes. The pulley wheel 53 is preferably made of smaller diameter than the pulley wheel 54 so that portions of the peripheral surfaces' The front sill l5 at positions adjacent its ends and opposite both sides of the mast 21 has pairs of brackets 55 and 56 secured thereto; the brackets of each pair being spaced apart from front to rear. A lateral stiff leg 57 has its lower end detachably se cured between the pair of brackets 56 by a bolt 58; said bolt extending through the brackets 56 and through a hole in thelower end of the still leg 57. rPhe upper end of the leg 57 .has an angular portion 59 provided with a hole through which ex- A second lateral stitiI leg 60 has its lower end secured between the brackets 55 by a bolt 61; said bolt passing through holes in the brackets and through a'hole in the bottom of the leg 60. The leg 60 at its Vupper end has an angularportion 62 which nected to the projecting portions of the at tachment plates 18a and 19a; said pivotal connection being through the medium of a removable pin or bolt -64 which passes through the attachment plates and through the end of the sill 63. Thus the'rear sill under certain conditions can swing on the bolt 64 as a pivot in the plane of the front sill.

The opposite end of the rear sill has a pair of brackets 65 secured thereto between which is secured the lowercnd. of a rear stiff leg or brace 66; the connection between the leg 66 and the brackets 65 being through the medium of abolt 67 which extends through hols in the brackets 65 and through a hole in the lower end of the leg 66. The upper end of the leg 66 has an angular ex- 'tension 68 provided with a hole through Whichthe sleever 38 of the mast extends; said extension 68 overlapping the extension 62 of the 'stiff leg60; the length ofthe exten-- sion 68 being such as to permiteither of the lateral stift' legs 57 and 60 te swing thereunder when their'lower ends are detached from the 4front sill by., removing the vbolts 58 or 61. Figure 1 showsin dotted lines as indicated at 'm either one of the lateral stiff legs having been detached from the front sill and swung into a position` under the extension 68 so that the lower end of the lateral stiff leg will be positioned directly above'the top surface of the rearsill 63.

The operating cables 69 and 70 lead to the derrick between one side of the rear sill- 63A and the front sill 15 Ypreferably1 at a 'slant-as, showiin Figures 4 and 5. The .cable 69 passes between the wheels47 and then through the aperture 46 into the space 20 of thefront sill and then under the wheel '53 and upwardly'through the"p'assage'33 ofthe. nipple 24,- and sleeve 24, through the chamber r23betv'veenthe 'standards 22, then through the passage 45 of the block 37 and sleeve 38., thenoverithe wh^el 43, then over a guide pulley 71 in the outer end of the boom 35, after which it passes around the wheels of pulley blocks 72 and 73v and is attached to the ear 74 on the pulley blockV 72;*said pulley blQck 72 having a hoisting device, such as lthe hook 75, mounted `thereonni'The cable 70 passes between the wheels 48 then through the aperture 46xinto the space 2 0`of the-front. sill 15, thenaround the wheel 54, upwardly through the passage 83 of the nipple 24a and sleeve 24, then upf wardly through the chamber 23 and passage 45 around Vthe wheel 44, then over a pulley block 7e which is unipa t0' the boom, than CII the ,space 26 in the front sill 15 and can be withdrawn to provide a front sill of an increased length and bearing surface as shown in Figure 6. vThse auxiliary extensions adjacent their outer ends havemembers 8O slidable vertically therein vwithin, guideways 81. The members at their lower ends support rollers 82 which can be.. moved downwardly into engagement with a floor or supporting structure to facilitate the moving of the derrick fromv one-place to another. Pins 83 .'can be inserted through holes in the extension 79 and in the members 8 0 so as to hold the rollers in their extended positions as shown 'in Figure 6 or in their retractedpositions asshown in Figure 7; it merely being necessary to remove the pins 83 from one of the holes in the extension and re-insert the pin in another one of said holes; the holes in the extension respectively registering with the .hole v in the member 8O when the member is either in its project-ed position or its retracted position.

In the operation of the derrick, the boom maybe swung into any position. in front of the sill 15 and if it is necessary that the boom shouldv swing at a greater radius, such for example asbetweenthe front and rear sills at either side Iof the rear sill,l it is only necessary to remove the pi vot rod or bolt 58 or 61 of the lateral stilfleg adjacent the side in-which it is desired to swing the boom, and to m'ove said stiff leg into a posia position between the front'sill and the rear sill on one side of the structure.

it is desired to attach thestif legA 60 to the K front sill and to release the lateral stiil' leg 57 and swing the latt^r into a position under the extension 68 of the leg 66, then the` boom, as shown ,in Figure' 5, can be swung yinto any position between the front sill and `the opposite side of the leg 66. It will be noted that this actioircan take place without vthe use of any guy tackle and furthermore that there is always one` of the 'lateral stili" le in its connected position with the front sill therefore the derrick is selfsupporting even when the boom swings into a position between the front and rear sills. It will be further noted that this arrangement permits the boom to swing within a radius of substantially 360o so as to increase the field of action on a derrick of this type.

By providing the attachment plates so as to have portions projecting forwardly and rearwardly of the front ,sill if'- it is desired the rear sill 63 can be attached at the opposite side as shown in dotted lines at 63a in' Figure l.

By having the arrangement of pulleys and the construction of mast as above described, the operating cables can be led to the derricl. and passed in such manner through the chamber 23, passages 38 and 45 and over the pulley vheels so that there are no projecting cables and at the same time the mast can swing with the action of the boom without fouling or becoming entangled, as

`is obvious from the constructionshown.

, The construction is such as shown in Figures 2 and 3 as to facilitate the assembly and erection of the derrick. The parts as shown in lFigure 2 can be attached while the structure is flat upon the ground and the rear sill-and stiff leg 66 can afterwards be swung into an upright position and then the whole device can be tipped into the position shown in Figure 3, after .which the boom can be quickly attached, together with the cables and if desired 'the cables can be inserted while the structure is Hat upon the ground and before it is tipped.

While I have described my invention asA taking a particular form, it will be understood that the various parts of my invention may be changed without departing from the spirit thereof, and hence I donot limit myself to the precise construction set forth, but consider that I am at liberty to make such changes and alterations as fairl' come within the scope of the appended c aims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is l1. A derrick including a transversely extending front sill; a rearsill pivotally connected to the front sill; a mast in pivotal connection with the front sill; a boom'pivotally connected to said mast; a stiff leg pivotally connected to said mast and connected to said rear sill and arranged to swing therewith; attaching means for pivotingsaid rear sill forward of said front sill; and lateral stiff legs pivotally secured with respect to the mast and detachably secured to the front sill at opposite sides of the mast whereby either of said stiff legs can be detached from the front sill and moved into I v A.position to permit the boom to swing to the rear of the front sill, and the rear sill to be swung and mounted forward of the front sill; substantially as described.

2. A 'derrick having a transversely extending supporting sill with a mast thereon; lateral legs slanting from said mast to said sill; an auxiliary extension slidably mounted on each end of said supporting sill; and supporting members adjustably connected to said extensions and having rollers thereon to facilitate moving said derrick; substantially as described.

3. A derrick having a transversely extending sill; a mast pivotally mounted thereon; a pairfof lateral stiff legs pivotally secured to said mast and detachably secured to said sill; auxiliary extensions slidably mounted in said sill and being expandable beyond said legs; and adjustable supporting means mounted beneath said extensions to facilitate moving the derriclr, substantially as described.

4. A derrick including a transversely eX- tending front sill; a rear sill connected to the front sill; attaching means for mounting said rear sill forward of the front sill; a mast pivotally mounted on said fro-nt sill; a boom swingably mounted on said mast: a rear leg connected to said mast and rear sill; and lateral stiff legs vpivotally secured with. respect to the mast and detachably secured to the front sill at opposite sides of the mast, the pivotal connections of the stiff legs to the mast being so constructed that either one of said stiff legs may be detached from the vfront sill and moved in a position beneath the rear leg and permit the boom to swing rearward to said y rear leg, substantially as described.

5. A derrick including a transversely eX- tending front sill; a mast mounted on said sill; a rear sill in pivotal connection with said front sill `and adapted to swing in the plane of said front sill; attaching means for pivoting said rear sill forward of said frontsill; a stiff leg pivotally connected to the upper portion of said mast and to the outer portion of said rear sill and arranged to swing with said rear sill; and asecond stiif leg pivotally mounted on said mast and arranged to permit swinging of the first leg over the second leg, for pivoting said rear sill on said attaching means forward of said front sill; substantially as described.

6. A derrick including a front sill; a mast pivotally mounted on said sill; means for supporting said mast; vertical pulley wheels disposed beneath said mast; a pair of pulley wheels including a large and small pulley wheel mountediadjacent and transverse' to said vertical wheels and arranged oppositely disposed pulley wheels arranged beneath said first pair of pulley wheels;

substantially as dscribed.

and cables connectedlto said boom, oneef In vtestimony whereofv Ivhave signed my saidi cables extending between one pair of name to this specification in the presenceof pulle wheels and over one vertical' pulley whee and another of said cables extending V AMOS S. HEFFRON.- between the other pair ofssaid pulley wheels` Witnesses:

and over the other vertical pulley wheel, ELIZABETH GABER,

' E. Po'rrs.

two subscribing witnesses.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5797504 *Jun 16, 1997Aug 25, 1998Mangum; BurneyPortable hoisting system
DE1258570B *Jan 28, 1965Jan 11, 1968Allmaenna Svenska Elek Ska A BHebekran fuer schwere Lasten
U.S. Classification212/175, 212/294
International ClassificationB66C23/60, B66C23/00
Cooperative ClassificationB66C23/60
European ClassificationB66C23/60