US2376676A - Extractor tool - Google Patents

Description

May 22, 1945. c. FERGUSON EXTRACTOR TOOL Filed July 15, 1942 www Mwg Patented May 22, 1945 2,376,676 EXTRACTon 'rooL v Charles Ferguson, Edinburgh 9, Scotland y Application July 15, 1942, Serial No. 451,084

' In Great Britain March 17, 1942 2 Claims. (Cl. 251-30) This `invention relates to a new or improved tool for extracting the base end Aof an article from a base or foundationin which it is fixed, the improved tool being primarilydesigned for ticle during the process of extraction tends to rotate the clamping jaws, in the directionin which the grip of the jaws on the article is increased.

In order to-restrict or limit fracture of the base extracting the stumps of metal or other posts, 5 or foundation during the extraction process, parstandards or vertical bars of demolished fences ticularly when extracting fence stumps from the or railings from the coping of the wall or other coping of a wall or other foundation in which foundation in which the stumps remainY fixed the stumps are xed, itis preferred to provide a after the fence or railing has been demolished. bolster or seating block between the clamp-ing Although the improved extracting tool has lbeen member and the coping of the wall or other founprimarily designed for extracting fence stumps, dation, this bolster being preferably a metal it will be apparent from the appended descripblock centrally apertured to fit over the fence tion and drawing that the improved tool can be post or like article, and the lower face of the utilised for extracting bolts or other articles from bolster being provided with a projecting rim surk the base or foundation in which they are secured. 1c rounding the lower end of the central aperture According to the present invention the imthrough the bolster and this rim being preferably proved extracting tool comprises a clamping sharpened or' knife-edged in order that this pro- Vmember having means for gripping the article to jecting rim will force itself into the coping of be removed at a point above the base or foundathe wall or other foundation under the reaction tion in which the article is xed, and one or more pressure which occurs during the extraction of manually operable elements carried vby the the fence postor like article. The vtop surface of clamping member and adapted to bear against the bolster is preferably flat and forms a supthe said base or foundation or against a bolster port for the clamping member which may also or seating block which may be interposed between be in the form of a metal block having a central the clamping member and the base or founda- 2c aperture through it to enable the clamping memtion in which the article is xed, the said eleber to be fitted over the fence post until the ments, when operated, being adapted to raise the clamping member rests on the bolster. clamping member by the reaction of the said ele- The accompanying Vdrawing illustrates the prements against the base or foundation on which ferred manner of carrying out the invention, Fig. they directly or indirectly bear. 1 being a side view, Fig. 2 an end view, and Fig. 3

The clamping member is preferably a metal a plan View of the extracting tool in its preor other block centrally apertured to t over the ferred form. Fig. Il is a vertical sectional view article to be removed and provided with one or on the line 4 4 of Fig. 3, showing a fence stump more adjustable clamping jaws for gripping the in position. article, and with one or more manually operable The tool illustrated comprises a clamping bleek cams or ceceni-,ries fu1erumed on the clamping 5 having a vertical central aperture 6 to enable member and adapted to bear with theveam surit to be fitted over the fence post 'I or other arfaces or peripheries of the eccentrics upon the ticle having its base end 8 xed in the coping of base or foundation or upon the interposed bola wall or other foundation 9. The block 5 is recster. The manually operable cam or eccentric 40 tanglllar and has SlOS l0 in WO Opposite SideS or each of such cams or eccentrics conveniently to leCeiVe toothed or serrated Clamping jaws Il has a handle attached thereto for rotating the Which are eCCeIllrCelly pivoted on transverse cam or eccentric with its cam surface in contact pivot pins I2 secured in the block 5. Attached to with the base or foundation `or in contact with ,and projecting from each serrated jaw Il is a the interposed bolster in order to raise the clamphandle i3 and it will be observed that the haning member and extract the base end of the ardles I3 are in alignment and extend in Opposite ticle therefrom. The clamping jaws preferdirections when the jaws Il are clear of the fence ably comprise a pair of eccentrically mounted D051?- BY turning the handles i3 about the centoothed or serrated cams or discs fulcrumed in tres of the pivot pins l2, the jaws Il may be the clamping block at opposite sides of the aper- Caused to grip the fence posi?. F01 raising the ture therein, each serrated eccentric jaw being clamping block 5 a pair of manually-operable attached to one end of a. handle whereby the jaw cams or eccentrios I4 is provided, these cams or may be turned in the clamping member to grip eccentrics being pivotally mounted on the outside the ertde- 'I'he eccentric mounting of the of the block 5 at the two sides not occupied by clamping jaws is such that the pull on the ar- 5l the jaws II. Each eccentric I4 is mounted on a pin I5, the two pins I being coaxially arranged in the block 5. Each eccentric I4 is also attached to one end of an operating handle I6 and as shown on the drawing, the arrangement may be such that each operating handle I6 is horizontal (or nearly so) when the vertical distance between the fulcrum pin I5 and the lower periphery of the eccentric I4 attains its minimum and 'maximum respectively, so that, by swinging the handle I6 through 180 degrees or thereabouts, the eccentric I4 will raise the block 5 above the bolster II by an amount equal to the eccentric throw. The handles I6 preferably normally extend in opposite directions as shown, so that by turning one handle in the clockwise direction and simultaneously turning the other handle in the anti-clockwise direction, both eccentrics I4 vwill be rotated in the required direction to raise the block 5 with the fence post l clampedthere- It-will be apparent that the block 5 and the peripheries of the eccentrics I4 may bear directly' upon the top of the foundation 9, but in order to restrict fracture of the foundation 9, it is-preferred to interpose a bolster IIwhich has a central aperture I8. A centering washer I9 is fitted in the upper part of the aperture Ill'y the washer I9 being apertured to ilt over the fence post 1. Recessed into the lower partof the bolster II is a hardened ring 20 having a circular projecting knife-edge 2| which is forced into the top of the foundation 9 by the downward pressure on the bolster I'I when thehandles I6' are operated to raise the block 5.

Inorder to enable the positions of theA handles I6' with respect to the eccentrics I4" to be adjusted to suit Ivarying conditions of working, particularly in conned places where it is not possible for the handles to extend out in opposite directions in a horizontal position, the. handles I6 are detachably and adjustably secured to the eccentrics I4. As shown, each eccentric has a central projecting pin 22 adapted to t a corresponding hole in the attened end portion I6a of the handle I6, which is provided with a laterally projecting stud 23 which can be entered in any one of a number of holes 24 in the eccentric I4. When the hole in the end portion of the handle I6 has been engaged with the central pin 22 and the stud 23 has been engaged in one of the holes 24, the handle IIi` can be secured in that position by a screw 25 driven into one of a series of screw holes 26 in the eccentric I5.

I claim:

1. An extracting tool comprising a block having a vertical central aperture therethrough and transverse slots in two opposite sides, a pair of serrated' clamping jaws eccentrically pivoted in said slots, a handle attached to each of said jaws, a pair of cam discs eccentrically pivoted on pivot pins on the outside of said block at the two sidesnot occupied by saidl jaws, a handle attached to eachv of said cam discs for rotating it about its pivot, means detachably securing each cam disc to its handle, and'means for varying the angular setting of each'cam disc with respect to' its handle.

2. An extracting tool comprising a block having a vertical central'aperture therethrough and transverse slots in opposite sides, a pair nof serrated clamping jaws eccentrically pivoted in saidl slots, a handle attached to each of said jaws, a

pair of 6am discs pivoted on'aligned pivot pins onl the outside of said block at thetwo sides not occupied by said jaws, saidA pins having their axes parallel to the pivotal axes of said jaws, a

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