US1142637A - Grab for transporters, excavators, and the like. - Google Patents

Description

F. SOCHOR.

GRAB FOR TRANSPORTERS, EXCAVATORS, AND THE.LIKE. APPLICATION man n lLY 22. 1911.

1,142,637. Patented-June 8, I1915.

3 SHEETS-SHEET l.

F. socHoII.

GRAB FOR TRANSPOHTERS, EXCAVATORS, AND THE/LIKE.

APPLICATION FILED IuLY22,1911.

l 3 SHEETS-s115111 2.

F. SOCHOR. GRAB FOR TRANSPORTERS, ExcAvAToR-s, AND THE LIKE.

APPLlCATlON FILED IULY 22,1911.

Patented June 8, 1915.

3 SHEETS-SHEET 3- m Re 5 Q E 0 Ww n #y 6 FRIEDRICH SOCHOR, 0F VIENNA, AUSTRIA-HUNGARY.

GRAB FOR TRANSPORTERS, EXCAVATORS, AND THE LIKE.

Specieation of Letters Patent.`

Patented J une 8, 1915.

Applieaticm filed July 22, 1911. Serial No. 639,913.

T0 aZZ lwhom, it may concern Be it known that I, FRIEDRICH SooHoR, a subject of the Emperor of Austria-Hungary, residing at Vienna, Empire of Austria-Hungary, have invented certain new and useful .Improvements in Grabs for Transporters, Excavators, and the like; and I do hereby declare the followingtobea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to grabs with variable gearing speciallysuitable for the handling of material in large pieces. The draw-4 backs 'of such grabs as previously constructed reside in their great height necessary to obtain a suiciently large opening, great weight owing to the considerable power required to close the jaws of the grab, and the consequence is that the crane is compelled to 4 at the ends of the supporting bar to attachment points on the arms, for the purpose of effecting a large opening `of the bucket halves vwhich latter separate owing to their own weight, their additional opening being effected only to a smallextent by the pull of the said ropes.

' The invention is illustrated by way of example in the accompanying drawings, in whichzy Figure 1 is an elevation, Fig. 2 a plan, Fig. 3 an end elevation, and Fig. 4 a side elevation of the grab in opened position, Fig. l 5'is .a side elevation, F-ig. 6 a plan of a 50 modiication.

In the drawings a denotes along horizontal supporting. bar at the ends of which are pivoted arms b b and b1 b1 for thetw bucket halves c and c1,A rigidly attached vto theV said arms. The arms are pivoted to the bar a on pins d d and d1 d1. The devices for the closing and opening of the bucket halves are separate.

The opening device comprises cranks h Zz, and connecting rods f f and f1 f1 arranged with a view to the rigid cooperation of the bucket halves, and driving ropes Ze Z2 attached outside to the arms or to the cranks It h. The operation of the mechanism is the lsame whether the opening ropes 7c are attially horizontal lines whereby the pins e c are caused to move to the left and right re.

spectively so that the bucket halves are opened. In the latter case, that is to say,

when the opening ropes are attached to the arms b b, b b', say to the pins or bolts e e', then on pulling the opening ropes these pins or bolts e e move in the same direction Ias in the former case, whereby the bucket halves are opened and through the medium of the connecting rods f and f the cranks are turned around the axis Z in the same direction as in the former case. Consequently it makes no difference at all whether the iopenl ing ropes la are attachedto the cranks or directly to the arms b b, b b. These cranks maybe as in the present case loosely mounted on a shaft Z journaled inthe supporting bar a. When the ropes lc c are attached to the cranks, these are formed as shown. in dotted lines in Fig. 1 and the ropes are attached'to pins i i while the connecting rods f f and f1 f1 are jointed at one end to pins gg and g1 g1 0n the cranks and at the other end to pins e e and e1 e1 on the bucketarms. In the other case however,the pins Z i are omitted and the ropes are attaced to any suitable point on the arms b b and b1 b1, such as to bolts e and e1 whence they pass over .rollers -w w journaled in the end of the supporting bar a. Byl means of the connecting rods which are positively connected to the cranks mounted on the supporting bar a the position of the two bucket arms with respect to the bar a and to each other is exactly and positively determinedso that a tilting or displacement of the supporting bar a owing to the resistance encountered by the edges c and 'v1 in the material to be transported, is impossible and any position elo other than the symmetrical posltion of the bucket halves with respect to the center line cannot occur.

The closing mechanism consists of pulleys p s s1 and t t1 mounted in brackets fu, u at,

tached to the arms t b and b1 b1, from which 'pulleys ropes 1' 1" pass over two drums o o. These latter and the two closing drums n fn,-

which also acts to prevent the grabfromV sinking too deeply inv the material. |llhe grab is thus protected from excessive overloading and the shield distributes the material picked up by pushing against the outer ends of the bucket halves.

rllhe supporting bar a is made so long that when the grab is closed the pivots d and Z1 lie nearly above the outer ends of the bucket halves so that the whole Width is utilized and, moreover, owing to the position of the bucket halves on the arms 'to which they are rigidly connected and the suspension of the latter at'the ends of the long support a, the surfaces of the bucket halves even when the grab is widest open are notv directed vertically against the material but lassume a favorable position for shoveling up the ma terial. With the improved construction the result is that the opening takes place at irst owing to Vthe weight of the bucket halves since they when the closing ropes are slack swing by themselves about the pivots d and d1 into the position of equilibrium. lln the second place the opening of the bucket halves is very large with even a small angle of rotation as in consequence of the far-out position lof the pivots Zand d1 the arms b and b1 are very long so that the edges lv and o1 of the grab describe a long arc with even a small `angle of rotation. By simultaneously pulling the opening ropes la lc, the toggle lever 'effect of the crank it It and the connecting rods f f and f f. or the direct pull of the opening ropes la on the arms b b and b b', is exerted to the greatest extent, exactly at the last instant when the y bucket halves have swung past the position of equilibrium and their weight again opposes their opening. lWhen the grab is to be closed the opening ropes 7c la are released and the closing ropes p p pulled.

ln the modification shown in Figs. 5 and 6, two cranks are used which are compelled to turn simultaneously through the same angle in' opposite directions by toothed seg# v porting amaca? ments la and h fast on the shafts lm of the said cranks and gearing into each other. rlthe connecting rods f f connect the crank pins g and g to the arms b b of the bucket halves c 0 at e e and rods el pivotally connect the crank pins g g to the opening ropes k ic. For opening the grab the rope is slackened, the grab opens by gravity owing to the fact that its rods are pivoted to the outer ends of the long horizontal supporting bar until the pins g, g have passed beyond their lowermost or dead center position, whereupon by pulling the opening ropes c k further movement of the cranks and connecting rods ff is caused.

lln all of vthe cases above described the crank pins g g' moverelatively to the supbar a and in a direction substantially parallel to the longitudinal aXis of such bar.

The technical advantages of the hereinbefore described improved grab may be briefly summarized as follows: (a) Small overall height owing to the attachment of all the members to an upper horizontal support. (b) lEXceptionally easy and reliable opening owing to the location-far out of the pivoting points of the bucket halves and the powerful pull or toggle lever edect at the end ot the opening motion. (c) Unusually wide opening due to the long bucket arms permitted by position of the pivoting points. (d) Favorable operation of the closing forces by utilizing the changing height of the-pulleys` during the closing motion and the said outer ends of such bar and having rigidly secured to their outer ends bucket halves, cranks, revolubly mounted on the said bar adjacent its center, connecting rods,

connecting such cranks with the said arms and engaging the latter intermediate the ends thereof, and means for separating the bucket halves including ropes connected to said cranks and other ropes extending down- .wardly around the said bar pulleys and 4connected to the' arms intermediate the ends of the latter..

lin testimony whereof, ll affix my signature, in presence of two witnesses.

FRlllEDRllCll-l SCHR. Witnesses z ARTHUR BAUMANN, AUGUST lFUGGEn.

Images