US1008345A - Automatic grab. - Google Patents

Description

G. LAUDI.

AUTOMATIG GRAB.

APPLICATION FILED OUT. 15, 19170.

1,0Q8,345, Patented Nov. 14, 1911.

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mural) STATES om LAUDI. or nosssLnoar-enaifliiannno,

atrrom'no GRAB."

To all whom it may concern:

Be it known that I, CARL LAUDI, a citizen of Germany, residing at 407 Grafenberger Allee, Dusseldorf-Grafenberg, have inventetl certain new and useful Improvements in an Automatic Grab, of which the following is a specification.

The present invention relates to that kind of automatic grab in which for the purpose of obtainin a considerable and graduallv lit increasing c osin r force, the grab jaws which are pivoted to tie lower cross bar or axle of the tackle are closed by means of a togglelcver mechanism. In contradistinction to the known devices of this kind the toggle lever joint of the improved grab according to the resent invention is acted upon by the upper lilock and the em it ing cord or rope, while the free on... 0 0th arms of the toggle-lever mechanism are connected to triangular arrangements of levers which are pivoted to the outer ends of the jaws of the grab and turn on a common axis.

A constructional form of the improved grab is shown in the accompanying drawings by way of example, Figure 1 being an elevation representing the grab in its closed position, while Fig. 2 is a similar representation of the grab in its open position.

The two jaws of the grab are ivoted at a to the lower cross bar or axle o the tackle. livoted to the jaws at b, b are lever triangles f, g, It, which are adapted to turn about a common axis 0. The triangles are connected at cl, (1 to the toggle lever mechauism (1,0 which is acted upon at its joint i by the upper block of the tackle or an equivalent part and the emptying cord or rope 3.

The automatic opening of the jaws has hitherto been accomplished by the weight of the lower cross bar and part of the weightof the jaws, additional weight being in many cases placed on the cross bar for etfectin the opening. An automatic grab shoul however not only open automatically, but the pull exerted by the cord or rope upon the winding drum of the hoisting apparatus should be sufiicient to rotate the drum so as to obviate the necessity of driving the hoisting up )aratus backward b motive ower. In the improved grab formin the subject of the present invention the w ole weight of the rab with the exception of the upper block of the tackle comes into play durm the opening, the whole grab being suspende EM me Specification of Letters Iaton t. Pat nted Nov". 14:, 1911. Application filed October 15, 1910. Serial No. [587,23 6.

g t! from the emptying cord qr ropbjl at i and a particularly strong pulling force 1s exerted on the toggle leversduri g the" lllltlakperiod of the opening move ent'bfthifrab.

to the jaws by means of the lever triangles f, g, h. turning upon their axis a and are also transmitted to the lifting rope or cord 4 and consequently to the drum of the hoisting rotated backward and a saving of motive power and labor is obtained.

In order to obtain the greatest etliciency and the most advantageous filling proportion of the rab the followin should be ful lled: A considers )le width of the jaws, a comparatively small weight of the grab proper, a large closing power, an advantageous osition of the aws, and a lar e opening oree.

t Wlll be seen that there are two lifting cords 4 and two em tyin cords 3. The lifting cords serve w ien t e grab is in its open position for closing the same, and serve a oted to the lower cross bar of a tackle and actuated by a to 'gle lever mechanism for the purpose of o tainin a gradually increasing closing force, t e combination of a to g e of t e tackle operatively connected to the joint of the toggle leveir mechanism, an emptying cord also connected to the said toggle lever joint, and t v0 lever triangles nected at their outer ends to the ends of the toggle levers and pivoted to the jaws of the gra 2. In automatic grabs having jaws piv- These large pulling forces-are! transmitted apparatus. The drum is thus automatically conditions so after closing the grab for lifting the is to be opened this is etlected by put- 5 Of course this means that dur- 1. In automatic grabs having jaws pivlever mechimisni, an upper block adapted to turn on a com non axis and con 10b oted to the lower block of a tackle, the com- 1 in 1e lower block, an uvers pivoted to the up ing cord fixed to the u mediate parts pivoted toggle levers and the connected to each othei,

perfglecli, toggle lesignature in presence of two witnesses. per cc an emptyn per bIpcl, and inter- CARL to" the ends of the Witnesses: jaws and pivotally H. Sonnoxm,

Loms VANDOBY.

Washington, D. 0.

m5 piveted to In tes tiimcny whereof I have M's'ixed m Copies of this pefiem: 174 Bbteincfi for five cents each, by addressing the commissioner oi Eastern:

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