US1975359A - Crane - Google Patents

Description

Oct. 2, 1934. T. N. GARsoN 1,975,359

- CRANE Filed-Jan. 25. 1932 2 sheets-sheet 1 MM fl, www.

INVENTOR BY-vr/ ATTORNEY Oct. 2, 1934. T, N GARSON 1,975,359

CRANE Filed Jan. 25. 1952 2 Sheets-Sheet 2 m @M 7% M INVENT ATTORNEY Patented Cot. 2, 1934 .f1 i 1 untreuer-Ares 'PATENT ortica CRANE Thorvald N. G'arson, New Brighton, Staten f Island, N. Y.

'Application Jennery 25, 1932, serial Ne. 588,645 2 Claims. (c1. 212-59) This invention .has been developed with spethem a shaft 15 upon which is mounted a drum cificv reference `to its application. to portable 16 carrying a ratchet wheel 17. Ratchet wheel cranes of the type particularly ,adaptedV for 17 isengaged by pawl 18 operated by a pullmounting upon a movable structure, as, for eX- rope 19.

51 ample, a tractor. It is capable of application tov Aiilxed to arm 91cm by securing plate 20 and 60 stationary cranes as well as to portable cranes. encircling shaft 15, is a coil spring 21, the op- One object of the invention is'to provide an posite end of the spring being connected by. auxiliary mast in addition to the primary mast plate 22 with drum 16. Wound upon drum 16 for the purpose of raising the boom and the load is a latching rope 23.

'i101 simultaneously with ease. vIn other words, the lAfter leaving the upper end of mast 7 and 65. invention relates particularly tomeans for so passingover pulley 14, hoist rope 5 is led over distributing the stresses imposed by the load a `pulley 24 carried at theV upper end of an upon the boom, its fulcrum and the hoisting rope, auxiliary mast 25 which is pivoted to a bracket so that heavier loads may .beraised by the boom arm 26 projecting forwardly of the mast 7.

115;v than would be possible withthe low primary mast On the auxiliary mast below pulley 24 is a 70 construction. pulley 27 which receives latching rope 23, the Another object is to provide means for retain rope being led over pulley 27 and thence over ing the boom in its raised position. a pulley 28 carried by a boom 29, the latter beingy The invention consists furtherin various depivotally supported at 30 to bracket 26 of the 20; tails ofA construction and combinations of elemast. 75 ments more `particularly explained in connec- After being led over pulley 28, latching rope 23 tion with the accompanying drawings, which ilisk led back to the mast and isv secured to thelatter' lustrate the embodiments thereof. asshown more particularly in Fig. 3.` 'lifhehoist The invention will be described with reference rope 5 is led over a sheave 31 at the end of the 25:;0 Jhe aCCOmIJal'll/ihg draWirlgS, in which boom and is connected to any suitable means 8()x Fig. 1 is a side elevation of an embodiment of such as the hook 32 for engaging the load. the invention. It will be noted from the above description Fig 2 iS a from? elevation, partly broken away, that the mast 7 provides a low mast for the crane of the auxiliary mast. and normally the latching rope and hoist rope 30.; Fig. 3 iS ah enlarged Side eleVaifOIl 0f the may be directly led from the mast to the sheaves 85 turret at its upper end showing the sheave over 28, 31, at the end of the boom 29. When, how- Which the hOiSt line iS led and alSVO ShOWiner Ithe ever, it is desired to raise heavier loads and the i laiehirlg mear1S boom simultaneously, the hoist and latching ropes Fig. 4 is a rear elevation of the structure shown are led as shown in Fig. 1, and the auxiliary mast .354 in Fig. 3. 25 Will be maintained in elevated position, as by 9 0 Referring i0 Fig 1 0f the drawings, I have means of securing the mast to a forwardly proshown at 1 a traCtOr Which may be Of any jecting arm 7x of the mast 7. For example, a suitable construction. Driven by chain 2 from bolt may be passed through a suitable aperture a power Connection is a Sprocket Wheel 3 00nin the auxiuary mast 25 and then passed through :4,0- nected by suitable shaft and carrying connecaperture a in arm 7x, The auxiliary mast in- 95y i 'tiOIlS With a drum i WhiCh Operates the hOiSi creases the angle b of the hoist rope 5 relatively rOiJe 5- The hOiSi? rope DaSSeS upWar-iy through to the fulcrum of the main boom 29. a hollow Standard, ihdieated ai? 6, Whieh IOtai- In the movement of the tractor with the crane ably SllPpOriS a masi? '7, the masi?, 0f Course, device mounted thereon, should low clearance be s45 being hollow and receiving the rope near its neeessery, auxiliary mast 25 may be lowered to a 1go 'I upper end aS ShOWIl irl Figs 3 and 4- position on top of the boom 29. 'W

Mounted upon the upper end of the mast, Assuming the auxiliary mast to be in the posieither integrally therewith, 0r boli/ed aS a Sepation shown in Fig. 1 with the hoist rope 5 led rate member, is a bracket 8, having Space-d arms over pulley 24 and thence over pulley 14 and .59; 9, 9x and 9mm, arm 9 having a bearing boss 10, through the mast to the hoist drum 4, and a 105 arm 9x having a bearing boss 11 and arm 9x3: latching rope to be led over pulley 27 and wound 'i having a bearing boss 12. The bearing bosses l0, upon drum 16, actuation of the hoist drum 4 will 11, receive between them, a shaft 13 carrying a elevate the load carried by hook 32. When it is pulley 14 over which hoist rope 5 is led. desired to swing the load inwardly toward the `55 The bearing bosses 10m, 12, support between tractor. the aforesaid movement of the hoist rope 17.110

may be continued until contact block 32x above hook 32 engages member 29a: of the boom 29 and raises the boom to such position that the load is suspended above the position to which it is to be lowered. To this end the hoist rope 5 is utilized both to hoist and lower the load and to control the elevated position of the boom. During such upward movement of boom 29, spring 21 will act upon latching drum. 16 to rotate the same counter-clockwise while pawl 18 will ride over the teeth of the ratchet wheel 17. When the hoist drum is reversed to lower the load, pawl 18 willy hold ratchet wheel 17 and drum 16 in position so that drum 16 will hold boom 29 in elevated position. Pawl 18 is normallyl held in engagement with ratchet 17 by a spring 18x. If, at any time it is desired to lower the boom 29, Contact block 32x is held in engagement with member' 29:13 ofv the boom 29, until pawl 18 is operatedr to release the ratchet wheel.

Spring 2L may be so related to the boom 29' that when the boom is in its maximum upward position, the spring will have the minimum effectv upon the drum 16 to move the same counterclockwise, and therefore when the boom is lowered, latchingi rope 23 will rotate drum 16, in clockwise rotation,` to wind the spring with constantly increasing tortional effect. Inasmuch as spring 21 is disposed exterior of the drum in case of breakage, a new spring may be placed in position without disturbing the drum since shaft 15 may be moved endwise in a direction toward the drum, the old spring slipped ofi the left-hand end of the shaft (Fig. 4) and a new spring readily placed in position.

It will be noted that one end of latching rope 23 is anchored to the mast 7 through the medium' of an apertured lug 7m, Fig. 3. The mast 7 is, as

, describedabove, supported by the standard 6, only ttoL eog

base with a sprocket wheel 33 and a sprocket wheel 34 on a shaft 35, which may be connected by any suitable means with the source of power for rotation of the mast at will, this forming no part of the present invention. When the crane is so designed that the member 7 is stationary it will, of course, constitute the primary mast, because the member 6 will be rendered unnecessary.

Having described my invention, what I claim and desire to secure by Letters Patent, is as follows:-

1. In a crane, a primary mast, a boom pivotally mounted relatively to the primary mast, a hoist rope, a drum and operating means therefor, a guide pulley carried at the upper end of the primary mast and receiving the hoist rope, an auxiliary mast rising substantially above the primary mast having a pivotal connection to the latter, a guide pulley carried at the end of the auxiliary mast andi receiving the hoist rope and means for holding the auxiliary mast inA xed5 position, said means'ibeing applied to the primary' mast whereby the hoist rope is guided by the auxiliary mast pulley in allpositions of? the boom.-

2. In a crane, a primary mast, a boom pivotally mounted relatively to the primary mast, a hoist rope, a drum and operating means' therefor,V a guide pulley carried1 at the upper end of! the primary mast andi receiving the hoist rope, an auxiliary mast risingV substantially above the primary mast, a guide pulleyV carried at the endl of the auxiliary mast andl receiving the hoist rope, means for holding the auxiliary mast in fixed position whereby the hoist rope i-sgui'ded? by the auxiliary mast pulley in all positions of' the boom, a latching rope pulley carried at the upper end of theprimary mast, a latching ropepulley carried near the-upper end of the auxiliary mast anda latching ropev connected tothe boom', and led' over said latching rope pulleys.

'rHoRvALD N. GARsoN.

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