Патент USA US2411305код для вставки
7 Nov. 19, 1946. E. w. TAYLOR ET AL FOLDABLE A-FRAME FOR EXQAVATING MACHINES Filed Aug‘. 25, 1944 2,411,305 2 Sheets-Sheet l 4F )1 O £32 MW?“ gm\Q#7 6 “M a” Z. nz NOV. 19, 1946. E_ w, TAYLQR ET AL 2,411,305 FOLDABLE A-FRAME FOR EXCAVATING MACHINES Filed Aug. 25, 1944 2 Sheets-Sheet 2 Pei‘e21 406 68/7. Patented Nov. 19, 1946 2,411,305 UNITED STATES PATENT OFFICE-e FOLDABLE A-FRAME. FOR EXCAVATING ‘ MACHINES Ernest W. Taylor and Peter Nielsen, Bay City, Mich, assignors to Industrial Brownhoist Cor poration, Bay City, Mich. Application August 25, 1944., Serial No. 551,174 ‘ ‘ (01. 212-59) 3 Claims. i . , This invention relates to foldable A-frames for excavating machines or other machines equipped with booms. _ ,Excavating machines; and particularly cranes of the shovel, clamshell, and dragline type are readily mobile, so that they can be moved from 2 ing machine, the solid lines showing the A frame raised, the broken lines showing the upper section in folded position; Fig. 2 is an enlarged side, elevational View of the A-frarne, the broken lines illustrating the upper section in folded position; one job to another; and there is used as a part Fig. 3 is a rear, elevational view; of the. structure, a so-oalled A-frame, certain Fig. 4 is a fragmentary, side, elevational view portions of which project above the machine illustrating the cable protecting means; structure over which certain of the operating 10 Fig. 5 is also an enlarged, fragmentary, side, cables of the machine are trailed and by means elevational view showing the upper end of the of which the elevation of the boom and operation foldable section; of other parts of the machine is accomplished. Fig. 6 is a top plan view thereof; and In the transportation of machines of this char Fig. 7 is a fragmentary, side, elevational view acter from one location to another, it is necessary 15 illustrating the detachable securing means. that they pass under overhead structures such Referring now to the drawings, the numeral as highway bridges, grade crossings, wires, and ‘the like; and in certain instances the overhead clearances on the job itself are limited. It is it indicates the base of a crane which is carried by suitable crawlers or traction devices I l, the base having mounted thereon a suitable platform therefore desirable that the A-frame structure 20 ii on which the mechanical equipment of the be designed so as to be as low as possible in order excavation mechanism (not shown) is mounted, that the machine may pass underneath low this machinery being housed in a, cab structure bridges, over-passes, or other obstructions. How l3 as usual. ever, an Aeframe that is low enough for such A boom 14 is pivotally mounted for swinging overhead clearances runs up the compressive 25 movement about the pivot point l5, and sheaves loading of the boom very materially, increasing l6 are journaled on a pin I‘! provided on the its weight and decreasing the live load handling outer end of the boom. A hoist ‘drum I8 is capacity of the crane. An appreciably higher A mounted on the platform 12 of the crane, and a frame reduces the loading on the boom, allowing hoist rope l9 is wound thereon, thence leading a reduction in the weight, thus increasing the over the sheave l5, and thence to a, fall block 255 available lifting capacity of the crane for live as usual so that any desired hoisting operation loads. Therefore, it is a prime object of the in can be accomplished. vention to provide an A-frame construction An A-‘frame Wis mounted on the platform 12 which can be adjusted to a 'low height when and is made up of compression struts or bars 22, overhead conditions require that, and to a higher t the lower ends of said struts being connected ‘clearance for handling maximum loads when to the crane platform ‘at 23, the ‘upper ends ‘being overhead conditions permit. formed with suitable openings ‘(not shown) to . Another object is to provide a foldable A accommodate a horizontally disposed shaft 24, 1 frame, the upper section of which is readily fold and while ‘the A-‘fram’e comprises ‘two sides which able upon the roof of the crane cab structure, 40 are identically similar, we shall, for the purpose and which can be quickly and easily raised, by of this description, describe but one side only. power, and without strain or snapping of the Stays 525 are “connected to the platform 12 at the various cables, etc., when‘the machine is spotted point 216 with the upper ends connected to the and ready for operation. shaft 24, and a cable protecting member 21 ‘is A further object is to design an A-frame of 45 mounted on said shaft, the face of said mem simple, practical, and substantial construction, ber being crowned as shown and for a purpose which can be easily manufactured and assembled, to be hereinafter described. and which can be easily raised or folded, and in Compression bars 28 form a part of the upper a minimum length of time. foldable portion of the A-frame and are con In order to provide a more precise understand 50 nected to the shaft 24, the upper end being bi ing of the nature and objects of the invention, furcated as at 29 and a horizontally disposed one speci?c embodiment will be described in con nection with the accompanying drawings in which: Fig. 1 is a side elevational View of an excavat shaft 30 is mounted on the upper end as usual. Tension members 3| are connected to the plat form I2 at the point 32, the upper ends being 55 connected by a shaft 33 to which the lower ends 2,411,305 3 4 to a sheave cage 43 in which the sheaves 44 are sion members respectively, the links being pivot ally connected at their inner end portions, with -The herein described construction and ar of the links 34, which form a part of the upper rangement admits of considerable modi?cation foldable part of the A-frame, are also connected, without departing from the invention; we the upper ends of the links 34 being connected therefore do not wish to be limited to the pre to the horizontally disposed shaft 35, and links v cise arrangement shown and described, which is 36 are also connected to the shaft 35 at a point for the purpose of illustration only, as the scope intermediate their length, the lower ends being of protection is to be taken solely from the ap bifurcated as at 3],‘ and openings 38 are pro pended claims, interpreted as broadly as is con vided in the lower end of the links 36 in register sistant with the prior art. with a similar opening 39 provided in the links What we claim is: 34, bolts 40 serving to rigidly secure the said links 10 1. In a crane of the class described, in com 34 and 36 together as a-rigid structure when the bination, a crane body, a boom pivoted thereto A-frame is in raised position. for raising and lowering movement, hoist means The shaft 30 together with the links 28, 34 and for raising and lowering said boom, an A-frame 36 complete the foldable upper section of the 15 structure mounted on the body and cooperating A-frame. with said hoist means and comprising a station- 7 Attached to the shaft 36 are the links 40a, to ary, low arch section and an upper high arch which the back stay 4| is connected, sheaves 42 section, tension members on the body, links pivot being journaled on said links and form a part ally connecting said upper section and the ten of the assembly. The back stay 4| is connected mounted, similar sheaves 45 being mounted in one end of one link overlapping the other, quickly the sheave cage 46 and the boom hoist line 41 is removable means for securing the free overlap trained over the various sheaves 44 and 45, ping end of the one link to the companion link thence being wound on the hoist drum 48 as usual. A boom line 43 is connected to the cage 25 to provide a rigid structure, said means permit ting folding of the high arch section when re 46 with the opposite end anchored to the outer moved, and manually operable means connected end of the boom, and it will be obvious that rota to said links and to the crane body to prevent a tion of the winding drum 48 will raise or lower snapping action when the high arch section is the boom accordingly. When it is desired to collapse the A-frame for raised. ' ’ 2. A machine as de?ned in claim 1 in which travel from one location to another, the end of a crown-shaped cable protecting member spans the upper end of the low arch section of the A the boom is ?rst lowered to the ground or onto a support (not shown), to slack the boom hoist line 41, the bolts 40 are then removed, permitting frame. ' ' ‘ ' ' 3. In a crane of the class described, in com the links 34 and 36 to jackknife‘on the shaft 35 and the links 28, 34, and 36 to swing on the shafts 24,30 and 33, so that the parts assume position bination, a crane body, a'boom movably mounted thereon,‘ an A-frame mounted on the body and comprising upper and lower sections,‘ tension as clearly indicated in broken lines of Figs. 1 and members on the body, the upper A-frame sec 2 of the drawings, the back stay cable 4| resting on the crowned face of the member‘Z'l, and the 40 tion being pivotally mounted on the lower sec tion, hoisting instrumentalities on the crane for top of the A-frame will then be substantially raising and/or lowering the boom, and including ‘ flush with the top of the cab structure l3 and a back stay, means permitting the upper section will readily clear all highway bridges, overpasses, of the A-frame to swing to folded position, said and similar obstacles, a block and tackle assem means including pivotally connected foldable 'bly 5|! being connected to the shaft 35 and to links connecting the upper section and the ten lugs 5| provided on the rear end of the cab, and sion members respectively, one end of one link a handle 52 being provided for tightening or loos being bifurcated to accommodate the end .sec ening as desired, this block and tackle arrange tion of the companion link, quickly removable ment being of conventional design at present on means spaced a predetermined distance from the the market. 7 pivotal connection of the‘ linksfor locking them When the A-frame is folded as indicated in against pivotal movement and‘ form a rigid struc broken lines in Figs. 1 and 2, and it’ is desired ture, a crowned member on the lower section of‘ to raise it preparatory to hoisting operations, the the A-frame and over which the back stay leads operator actuates the boom hoist drum '48 in the when the upper section 'is in folded position, and usual manner, thus winding in the cable 41, and an adjustable block and tackle means connected placing strain on the hoisting cable which ?rst to the links of the upper section of the A-frame swings the link members 28, 34 and 36 upwardly, and to the crane body to prevent snapping of 7. automatically swinging them to position indi the A’-frarne members‘when said frame is swung cated in solid lines, the bolts 4|] are then inserted; the block and tackle assembly 5|) is removed, and the machine is now ready for work, the raising, is 'quick, easy and. smooth, there is no jerking or undue strains, and no rearrangement of heavy assembly is required by the operator. > ' so to raised position. ‘ ‘ ERNEST w. TAYLOR, PETER NIELSEN.