US1352665A - Lifting-dog - Google Patents

Description

' M. F. HEALY.

' LIFTNG DOG. -APPLIcATloN FILED 1uLY19, 1919.A

PatentedSept. 14, 1920.

UNITED sTATEps PATENTv OFFICE.

` MAURICEF. HEALY, or wn'rnn'rowiv, MASSACHUSETTS.

LIFY'rING-Doe.'

Application filed .Tuly 19, 1919. v VSerial No. 312,088.L

(FILED UNDER THE Acr'r or MARGH 3,1883, 2,2 sur. L., 625.)

To all whom it may concern.'

f Be it known `that I, MAURICE F. HEALY,

y heavy bodies by inserting it. intoa cavity contact with steel or other hard substance. f

in'` the body to be lifted, said device being heldtherein by friction or otherwise ydue to teheexpansion of its 'l 'parts within the cavity. y j The construction of the vlifting .dog vhere shownis especially adapted for use in lifting lprojectiles or other heavy bodieshaving tapering or bottle-neck cavities, the outereX- tremity of which is screw threaded Vor is otherwise liable to/injury if vbrought into The object is to provideasimple, durable and inexpensive device vof the Vclass de-V scribed in which convenient,meansy are pro videdfor the insertionbfthedevice inits collapsed form into thecavity of thebody vto be lifted.

inother object is to provide yccnvenient means for callapsing the parts and removal of the device from thecavityafter the lift-y ing operation has been performed.

Another object is`to provide against any injury to the screw threads or otherdestru'ce tible surface at the entrance tothe cavity. To that end a structure is provided wherein 4 the expanding or adjustable parts coming in contact with the walls of the cavity are located entirely within the cavity and re-` mote from the entrance` thereof, thus avoiding any breakage, chipping orother damage nearthe cavity entrance. This feature is of specialimportance in lifting stone or other fragileubodies as well as projectiles having screw lthreads at the entranceto the cavity.

Apreferred embodiment of ythe improved arms 13,

device is shown in the accompanying draw ing in'which similar numerals indicate corresponding parts in all the figures.

' Figure l is an elevation of the lifting dog shown in its collapsed or non-engaging position in the end of a projectile.

Fig. 2 is a similar view with the parts expanded and in contact with the interior walls of the projectile, or in their lifting position. u v e l .Y

F 3 is atop plan view of the vsleeve and the parts mountedthereon. j V

Referring to the drawings by numerals, the device consists of thehanger or lifting rod 10 having the cone orspreader 11 mounted at itslowerend and the sleeve or'collar 12 on which;` are mounted the jaws or The vlifting rod 710 is preferably formed with anl eye head Mat its upper end or other suitable 'means for thereception of the ring 15, whichvring is adapted fory connection with the lifting cable ofga hoisting means not shown. `The lower end of the rod l0 is screw threaded at 16 to receive nut 17, which locks the cone or spreader 11 on the rod. The rod i() may be `taken yfrom stockof the proper diameter, cut into lengths, threaded at one end and flattened and punchedat the other, when it will be readyk for use; all of 'which maybe performed by unskilled labor.

The cone or spreader 11 is provided with the bore 18 and inclined outer surface 19, and said cone is threaded on rod 10 and is firmly held in place by lock nut 17. The cone is, liowever,rotatably radjustable in relation to the arms 13 which are adapted to Contact with its upper face, thus prolonging'the life ofthis part of thedevice by distributing the wear over the entireV surface of the cone.

- The cone 11 may be castreadyfor use.

u The sleeve or collar l2, is provided with a central bore'2O in which rod l() looselylits. The sleeve is preferably cylindrical-and of la diameter considerably less than the dimensions of rthe cavity into which it is to be inserted. VIn theouter face of the sleeve 12,A

are arranged a series of longitudinal dovetail grooves 21, in which preferably wooden strips 22 are inserted and'project'beyondthe surface of the sleeve to suoli an extent as to j come in contact with an outer or encircling body and prevent any contact between said outer body and the sleeve.

Near its upper edge the sleeve is provided with radial openings 23, preferably threev in number, spaced uniformly about its periphery in which rods 24C have a driving lit. 'lhe rods 2l which may be stock cut to length have dual `functions, one being to provide handles whereby the device may be inserted into or removed from the cavity in the body to be lii'ted, the other tov rest on the upper edge of the cavity and suspend the device in the desired position within the cavity.

From the lower acevof the sleeve 12, depending ears 25 extend, and pivotally mounted on said ears are opposed arms or jaws 13.

'lhe sleeve which may be cast ready for use, as above statedv is rotatable on rod 10 and thusV prevents localization of wear on said rod, in its bore or on the outer surface oli the strips carried by the sleeve.

rl"he arlns are somewhat wider than the ears 25 and are solid throughout with the exception of the upper bii'urcated end, which provides wings or projections 26 lying on opposite sides of the ears 25 and to which the arms are pivotally secured by bolts 27 passing through openings in the ears 25 and wings 26. i

By mounting the arms in the manner de scribed, the normal position of said arms when suspended on their vpivots 27, is hanging directly down therefrom or in a vertical position. ris shown in Fig. 1, said arms when callapsed are well within the outer dimensions of the sleeve and will freely enter any opening into which the sleeve will pass.

'lhe lower endsl ol' the arms 13 which may be cast readylor use are tapered on tour surfaces. 'llhe inclined or taliiered si c is adaped lorcontact with the suiiace i9 or the cone to facilitate the spreading or the arms. llhe outer tapered surface 29 is provided to increase the contacting surlaces between the arms and the walls of the cavity, and, therefore, the friction between 'the parts and the lii'ting capacity of the device. rEhe rounded or tapered Vedges ot the arms as shown at l0 are to prevent scoring the internal face of the cavity and to pevent a surface lor contact with the walls f* `:he cavity that would not be as liable to fracture as the sharp point presented if said edges were not rounded. The tapers 30 above described also present a more uniform contact or bite between the arms and the different size cavities in which the device is intended for use.

Referring to Fig. 2 wherein the parts are shownin the lifting position, it is seen that the portion of the arm below the dotted the solid portion of the arms 13 'and the cone which is thereby caused to grip the rod 10 and partly relieve the screw threads and diminish the vtendency to pull the rod ont 0f the cone by stripping the threads.

The operation will be clear by reference to the parts shown in Fig 1 of the drawings, wherein the device is supported by the' rods 24 resting'at the mouth oi' the cavity.

By grasping the handle or rods 24, the device is suspended in a collapsed position and may be inserted into or withdrawn from the cavity. Aiter the device has been inserted into the cavity as in Fig. 1, and lifted by the ring 15 'or rod 10, the arms 13 will be spread by cone 11 as in Fig. 2 and the projectile lifted. By lifting the device by the handles 2l or sleeve 12, the arms will be withdrawn or allowed to drop linto a vertical position below the bolts and the devicemay be readily removed from the cavity.

Having described vmy invention, what I claim as new and desire to secure by Letters Patent, is

1. A. lewis, including a lifting rod, a spreader on the lower end of the rod,l an elongated sleeve loosely mounted on the rod and slidable longitudinally thereof, means carried by the sleeve for suspendingthe same in the mouth ot a cavity, and armsconnected lto the lower end of the sleeveand actuated by the spreader to engage the wallsof 'the cavity.

2. A lewis having a lifting rod, a cone shaped spreader threaded on the lower end ol the rod and rigidly locked thereon, a sleeve loosely mounted on the `rod and means for contact with the walls of the cavity supported on the sleeve.

3. A lewis having a lifting rod,` a spreader, a sleeve having a padded surface loosely mounted on the rod and arms for Contact with the walls of a cavity supported on the sleeve. 1

4. A lewis having a lifting rod, a spreader, a sleeve loosely mounted on the rod having grooves in its outer face for the reception of protecting strips and means for-contact with the walls of a cavity supported on the sleeve.

i 5. A lewis having a lifting rod,'a s reader, a sleeve loosely mounted on the rodI means for suspending the sleeve in a cavity and arms for contaet with the Walls of the eavity, supported on the sleeve.

6. A lewis having a lifting rod, ra spreader,v`

a sleeve loosely mounted on the rod, lugs de-V pending from the sleeve and arms for contact with the walls of a cavity supported by said lugs.

8.y A lewis having a lifting rod, a spreader, a sleeve loosely mounted on the rod, lugs de'- pending from the sleeve and arms for contact with the walls of a cavity pivotally connected to the lugs.

9. A lewis having a lifting rod, a spreader, a sleeve'loosely mounted on the rod, lugs depending irom the sleeve and arms having tapered lower ends for Contact with the Walls of a cavity pivotally suspended from the lugs. A

MAURICE F. HEALY.

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