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Publication numberUS3194413 A
Publication typeGrant
Publication dateJul 13, 1965
Filing dateOct 8, 1962
Priority dateOct 8, 1962
Publication numberUS 3194413 A, US 3194413A, US-A-3194413, US3194413 A, US3194413A
InventorsLouis J Landry
Original AssigneeLouis J Landry
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Extendable boom
US 3194413 A
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Description  (OCR text may contain errors)

L. J. LANDRY EXTENDABLE BOOM July 13, 1965 '3 Sheets-Sheet 1 Filed me, 1962 Louis J Landry INVENTOR- L. J. LANDRY EXTENDABLE BOOM July 13', 1965 s Sheets-Sheet 2 Filed 001'.- 8. 1962 m& m& N9

wk vm 3 N Eh Louis J Landry INVENTOR.

July 1 3, 1965 J. LANDRY I EXTENDABLE BOOM Filed Oct. 8.1962

Fig. 3

3 Sheets-Sheet 3 Louis J Landry mmvrm United States Patent 3,194,413 EXTENDABLE BOOM Louis J. Landry, 210 Darbonne St., Sulphur, La. Filed Oct. 8, 1962, Ser. No. 229,081 7 Claims. (Cl. 212-55) This invention relates to a novel and useful extendable crane boom and more specifically to a crane boom including inner and outer sections mounted together for longitudinal extension and retraction. In addition, the crane boom of the instant invention is designed specifically as a replacement for a rigid boom on substantially any type of crane presently in use. The extendable boom of the instant invention includes pennant lines which are reeved in a manner enabling the extendable boom to be used on any type of crane having a gantry assembly. Still further, the extendable boom of the instant invention is provided with Winch beams for raising and lowering the free end of the boom and for extending and retracting the extendable sections of the boom. In this manner, any suitable source of power may be utilized.

In addition to the above, the extendable boom of the instant invention has its inner and outer extendable sections constructed in a manner whereby the inner upper section is guidingly mounted for longitudinal reciprocal movement and against lateral movement relative to the outer lower section in at least three different directions. Still further, the extendable boom also includes means for guidingly supporting the upper inner section thereof against rotational movement about its longitudinal axis relative to the outer lower boom section.

The main object of this invention is to provide an extendable boom which may be readily utilized as a replacement for the rigid boom on substantially any type of crane utilizing a gantry assembly.

A further object of this invention is to provide an extendable boom in accordance with the immediately pre ceding object having electric motor means drivingly connected to winch means mounted thereon for raising and lowering the free end of the boom and for extending and retracting'the upper inner section of the boom.

Another object of this invention is to provide an extendable boom with the telescoped sections thereof constructed in a manner whereby the upper inner section of the boom is guidingly supported from the lower section thereof for longitudinal reciprocal movement and against lateral movement in at least three directions relative to the outer lower section of the boom.

Yet another object of this invention, in accordance with the immediately preceding object, is to provide an extendable boom whose upper inner section is supported from the outer lower section for longitudinal extension and retraction and against rotational movement relative to the lower outer boom section.

A final object of this invention to be specifically enumerated herein is to provide an extendable boom in accordance with the preceding objects which will conform to conventional forms of manufacture, be of simple construction and easy to operate so as to provide a device which will be economically feasible, long-lasting and relatively trouble-free in operation.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a side elevational view of a crane having the extendable boom of the instant invention mounted thereon;

FIGURE 2 is a fragmentary top plan View of the em- 3,l4,4l3 Patented .luly 13, I965 bodiment illustrated in FIGURE 1 on somewhat of an enlarged scale;

FIGURE 3 is a fragmentary enlarged sectional view taken substantially upon the plane indicated by section line 3-3 of FIGURE 2;

FIGURE 4 is an enlarged transverse sectional view taken substantially upon the plane indicated by section line 4-4 of FIGURE 3, with only a single lift line pulley shown;

FIGURE 5 is a transverse sectional view taken substantially upon the plane indicated by section line 5-5 of FIGURE 2 and on somewhat of an enlarged scale;

FIGURE 6 is an enlarged fragmentary sectional view taken substantially upon the plane indicated by section line t6 of FIGURE 3;

FIGURE 7 is a fragmentary perspective view of the supporting cables for the extendable boom showing the manner in which the pennant lines may be reeved over the gantry assembly of a crane and the manner in which the winch means carried by the extendable boom may be utilized to raise and lower the free end of the boom and also to extend and retract the extendable upper inner section of the boom; and

FIGURE 8 is a fragmentary enlarged perspective view of the upper end of the extendable upper inner section of the boom shown with the head end thereof removed.

Referring now more specifically to the drawings, the numeral 10 generally designates a conventional type of crane. The crane It) includes a platform or base generally referred to by the reference numeral 12 which is supported by means of a crawler tread assembly generally referred to by the reference numeral 14. A cab and prime mover housing generally referred to by the reference numeral 16 is supported from the main frame of base 12 and it may be seen that a gantry assembly generally referred to by the reference numeral 18 is supported from the upper portion of the cab and prime mover housing 16.

The mounting frame or base 12 includes a pair of mounting flanges 20 to which the lower end of the extendable boom 22 is pivotally secured by means of an axle pin 24. The extendable boom 22 includes a pyramidal butt section generally referred to by the reference numeral 26, a main section generally referred to by the reference number 28 and a generally pyramidal head section generally referred to by the reference numeral 30.

With attention now directed more specifically to FIG- URES 2, 3, 8 of the drawings it may be seen that the butt section 26 includes an electric motor 32 which is drivingly connected to a gear reduction assembly 34 having an output shaft 36. The output shaft 36 is drivingly connected to a main winding drum assembly 38 including first and second halves 40 and 42 separated by a divider flange 44. In addition, a pair of auxiliary winding drums 46 and 43 are supported from the butt section 26 and are rotated from the main winding drum 38 through a pair of clutch and brake assemblies 50 and 52 respectively. The clutch and brake assemblies 50 and 52 may be of conventional design similar to those now in use on existing cranes. It will be noted that the main winding drum 38 is approximately twice as great in circumference as the auxiliary winding drums 46 and 48.

The main section 28 of the boom 22 comprises an upper inner section generally referred to by the reference numeral 54 and an outer lower section generally referred to by the reference numeral 56. The outer lower section 56 includes four generally parallel and longitudinally extending angle members 58 which form the four corner longitudinal edges 69 of the outer lower section 56. Corresponding ends of the four angle members 58 are interconnected by means of four transversely extend brace members 62. In addit each P of adlacent together for relative movement between extended and retracted positions, a gantry assembly supported from said frame and elevated above the lower end of said lower section, a first cable supporting said boom and having one end operatively connected to reversible winding means carried by said lower section and the other end connected to said upper section, means reeving said first cable between said winding means, said gantry, and the upper end of said upper section, a second lift cable having one end operatively connected to said winding means and the other end connected to the lower end of said upper section, means reeving said second cable between said winding means, the upper end of said lower section, and the lower end of said upper section, said winding means including means for inversely winding and unwinding said first and second cables at rates enabling the angle of said boom to be maintained substantially constant during extension and retraction of said boom, said reversible winding means being spaced toward the upper end of said boom from its axis of rotation relative to said frame, and said gantry being spaced above said axis a distance greater than the distance between said axis and said winding means.

2. The combination of claim 1 wherein said winding means includes means for also winding and unwinding one of said cables independently of the other of said cables.

3. The combination of claim 1 wherein said outer section includes diagonal braces forming each of the sides thereof secured between the outer surfaces of the adjacent flanges of adjacent angle members.

4. The combination of claim 1 wherein said inner section includes diagonal braces forming each of the sides thereof secured between the inner surfaces of the adjacent flanges of adjacent angle members.

5. In combination, a mounting frame, an upstanding boom pivotally secured at its lower end to said frame for movement about a horizontal axis, said boom including upper inner and lower outer sections mounted together for relative movement between extended and retracted positions, a gantry assembly supported from said frame and elevated above the lower end of said lower section, a first cable supporting said boom and having one end operatively connected to reversible winding means carried by said lower section and the other end connected to said upper section, means reeving said first cable between said winding means, said gantry, and the upper end of said upper section, a second lift cable having one end operatively connected to said winding means and the other end connected to the lower end of said upper section, means reeving said second cable between said winding means, the upper end of said lower section, and the lower end of said upper section, said winding means including means for inversely winding and unwinding said first and second cables at rates enabling the angle of said boom to be maintained generally constant during extension and retraction of said boom, said reversible winding means being spaced toward the upper end of said boom from its axis of rotation relative to said frame, and said gantry being spaced above said axis a distance greater than the distance between said axis and said winding means, said inner and outer end sections each being generally polygonal in cross section and including a plurality of longitudinally extending and generally parallel angle members opening diagonally inwardly extending along each corner edge thereof, each of said angle members including a pair of angularly disposed longitudinally extending flanges generally paralleling the adjacent sides of the corresponding boom section, each of said angle members including a plurality of flanged rollers spaced longitudinally thereof each journalled for rotation about an axis extending transversely thereof and disposed in a plane generally paralleling the plane in which one of the flanges thereof is disposed, each of said rollers being disposed on the side of said one flange adjacent the corresponding flange of the other section and disposed in rolling contact with the side of said corresponding flange and with the inner side of its flange engaging the free longitudinal edge of said corresponding flange.

6. The combination of claim 5, said winding means including means for also winding and unwinding one of said cables independently of the other of said cables.

7. .In combination, a mounting frame, an upstanding boom pivotally secured at its lower end to said frame for movement about a horizontal axis, said boom including upper inner and lower outer sections mounted together for relative movement between extended and protracted positions, means connected between said boom and said frame for pivoting said boom about said axis and for extending said upper section relative to said lower section, said inner and outer sections each being generally polygonal in cross section and including a plurality of longitudinally extending and generally parallel angled members opening diagonally inwardly extending along each corner edge thereof, each of said angle members including a pair of angularly disposed longitudinally extending flanges generally paralleling the adjacent sides of the corresponding boom section, each of said angle members including a plurality of flanged rollers spaced longitudi nally thereof each journalled for rotation about an axis extending tranversely thereof and disposed in a plane generally paralleling the plane in which one of the flanges thereof is disposed, each of said rollers being disposed on the side of said one flange adjacent the corresponding flange of the other section and disposed in rolling contact with the side of said corresponding flange and with the inner side of its flange engaging the free longitudinal edge of said corresponding flange.

References Cited by the Examiner UNITED STATES PATENTS 2,545,047 3 51 Russell 2 12--5 5 2,819,803 1/58 Obenchain 2l255 3,029,954 4/62 Grant 212--55 3,073,457 1/63 Thomas 242-144 SAMUEL F. COLEMAN, Primary Examiner.

KARL J, ALBRECHT, ERNEST A. FALLER,

Examiners.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2545047 *Jul 12, 1947Mar 13, 1951Insley Mfg CorpAdjustable boom for cranes or the like
US2819803 *Oct 12, 1954Jan 14, 1958Leo B ObenchainBoom for cranes
US3029954 *Feb 24, 1959Apr 17, 1962William H GrantAdjustable boom crane
US3073457 *Mar 10, 1960Jan 15, 1963Thomas LouisAutomatically folding boom for cranes
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3308967 *Oct 6, 1965Mar 14, 1967Barkley Byron FExtensible boom crane
US3732988 *Oct 12, 1970May 15, 1973Case Co J IJib assembly for telescoping crane boom
US4352434 *May 1, 1980Oct 5, 1982Fmc CorporationPendant supported hydraulic extensible boom
US4392573 *Aug 18, 1980Jul 12, 1983Coles Cranes LimitedTie rope compensation arrangement
US4489838 *Aug 17, 1981Dec 25, 1984Fmc CorporationLow droop multi-part pendant supported boom
US4492312 *Jun 30, 1982Jan 8, 1985Fmc CorporationExternal pendant pay-out system with anti-droop control
US4544071 *Oct 29, 1984Oct 1, 1985Fmc CorporationFor maintaining working angle of a pendant supported extensible boom
DE2212249A1 *Mar 14, 1972Sep 28, 1972Potain SaKran mit teleskopierbarem und anhebbarem Ausleger
WO1984000152A1 *Jun 30, 1983Jan 19, 1984Fmc CorpPendant control system for pendant supported boom
WO1984000153A1 *Jun 30, 1983Jan 19, 1984Fmc CorpFloating sheave type pendant pay-out system for pendant supported boom
Classifications
U.S. Classification212/264
International ClassificationB66C23/687, B66C23/697, B66C23/72
Cooperative ClassificationB66C2700/0392, B66C23/72
European ClassificationB66C23/72