US1773205A - Collapsible core for concrete piles - Google Patents

Description

Aug. 19, 1930. H. R. SMITH coLLAPsIBLE GORE FOR CONCRETE PILES Filed Feb. 27, 1926 2 sheets-sheet 1 A Tio/ENE YS Aug. 19, 1930. H. R. SMITH COLIIAPSIBLE CORE FOR CONCRETE PILES Filed Feb. 27. 1926 2 Sheets-Sheet 2 WNS.

INI /ENTOR A TTORNE YS IWI .wil/Agra,

A,relatively to the outer casing, thereby vcarrying the expanding collars of the shaft out of engagement with the youter casing and allow- Y ing thev latter to collapse sufficiently to be Patented Aug. 19, 1930 UNITED `STATES PATENT OFFICE HERMAN R. SMITH, OF DOUGLASTON, NEWvYORK, ASSIGNOR T0y RAYMOND CONCRETE PILE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF'NEW JERSEY COLLAPSIBLE CORE FOR CONCRETE PILES Application led February 27,1926. Serial No. k91,024.

' y' This shaftis provided with a plurality of spaced collars, in the shape of frustums of cones, which cooperate with corresponding surfaces attached to the sectional casing forming the outer surface of the core.. The outer casing is made in sections, each section being connected to the central shaft by short links, for apurpose to be described.

The central shaft is provided at its upper end with a driving head and with devices to ycontrol the collapsing of the core after the driving is finished. a

The core is expanded by raising it into vertical position and landing it on a timber, the

weight of the parts causing the cone shaped collars on the central shaft to actV upon the cooperating surfaces ofthe outer core'sections to `expand them to full diameter. The core is held in expanded position by means of locking dogs which hold the core sections up to the head. The shell is put on afterthe core is expanded, and is then driven to position.

.After completion of the driving operation the core is collapsed by mechanism in the head, actuated through a false driving head, which is in turn actuated by the hoisting effort applied to withdraw the core from the driven shell.

The initial movement of the false head serves to actuate a leversystem which forces a movement of the central shaft easily Withdrawn from the shell bythe short links connecting it tothe central shaft.

Sometimes, during the driving operatlon,

vthe contacting surfaces of the .central'shaft and outer casing become so tightlywedged Y v indersf24, each closed on top with a screw together that it is very diiiicult to draw them hammer. ,manufactura easy to keep 1n working order,

curedby threaded joint 22.

apart, and the object of the present invention Ais to provide improved means to Vbring about such movement of central shaft and outer casing relatively to each other as is necessary in order to collapse the core after driving.

In some prior designs the collapsing mechanism comprises a lever ysystem actuated by the false head when force is applied, while in other designs force is supplied bythe driving hammer or jack.

My present invention discloses an improved device, hydraulically operated, and entirely independent of hoisting tackle or driving Itis simple in design, cheap to and may be operated manually or by power.

In the drawings, Fig. 1 shows an interior view of a complete core embodying my device, with outer casing expanded.

Fig. 2 shows an interior view of a complete i Y core embodying'my device, with outer casing collapsed, and with hydraulic pump attached.

Fig. 3 is .a cross section on line 3 3 of Fig. 2.

Fig. 4 is, an interior view of a complete core showing a modified form of my device, the core being expanded ready for driving.

Fig. 5 shows the samemechanism as Fig. 4 with core collapsedand with pump attached.

Fig. 6 is a section on line 6 6 of Fig. v5.

Referring to Figs. 1, 2 Aand 3, the pile core is formed witha central member in the form of a shaft 10, either solid or hollow and provided at intervalsalong its length with collars 12 having outer surfaces in the shape of frustums of cones, and arranged to contact Iwith cooperatingr surfaces formed on members 14 rattached to the outer casing. The casing is shown as made in three sections 16 but may be of any desired number, two or more. The central shaftand outer casing sections are inter-connected by links 18 which serve, after `collapsing has been effected, to withdraw the casing with the shaft.

At its upper end shaft 10 is provided with a driving head 20, into which shaft 1Q is se- In the top of head20 are bored three cyl*-` bya lpassage 34 vand so pijpowei.

55, core and movingslaft 10 nVtcv e fear-'afs eusnigfseeaiiiifzewf plug.26. Within each cylinder 24 is a plunger 28 provided with a downwardly projecting stem `3() which asses through a drilled hole in the bottom oi) its cylinder and rests on the 5 top of one ofthe sections 16 of the outer cas- `o'znd in head' 20, justbelow its upper surface, is the ring sha ed passage 32, connested tombe upper end-gef each cylinder 24 havingnn inlet passage 36.

To the threaded outeretld of `lgmssage-Bi is4 attached a hose 38 from force pump 40 which for convenience is mtnliedwin''reservoir42.v 1A, lever handle 44 is shown for operating the Vis desired to removewthe core, hooks48 are 4o` Asktsteins 30 of plungers 28 are restingion the "tolsjocsings 16v the reaction of the oil pressnrebetsbveenA caps 26 raises edd andV s Taft `relfively to the` other daingjtfliereby withi'drawin 'conewedges 12 un om ensgemeiiiwan-iiiem ers 14; thus a1- casing 16 tbicoilase sucientl to gf, 7 .f easy winidmwiifr in sie piie s en. lib nesting-naine is attached to head 2o, to-whclzi'shaft 10 isittaehed at 22. Links S0 y 18 connect the various sections of the casing os'siiafineiiibeib arm is provided with a nose 7() in contact with the wedge-shaped point 72 on the lower end of stem 74 extending downwardly from plunger7 6 in cylinder 78. The top of c 1inder 78 is closed by plug 80. Plunger 6 is normally held at the top of cylinderv 78 by spring 82 surrounding stern 74.

Fig. 4 shows the core in expanded positien, 4ready for driving,-with headV 20 and casing sections v16 in Contact `at 46 and inembers 14 expanded by wedges 12. Plunger 76 is'atthe upper end or' cylinder 78, and the nose of the toggle is on or near the vertical center-line of 'head 20.

After the driving operation is finished and it is desired to Withdraw the core, oil is forced between plunger 76`and cap- 80 by ump 40, forcing pluri r 76 downward an V,driving the wedge 72 etwe'en the nose ends 70`o`f'the toggl'es, thus straightening the V`:5nd causing them to lift head ,20 relatively to casing 16, thereby causing' the collapse of the latter as described above.

Toggle Alevers 60 and 62`are' relieved-of any tension strain while the core is raised with .hoisting tackle', because pins 66 attire lower ends of toggle links`62 are fitted into slots 84, thus permitting the lifting strain to be carriedby links 1 I claim:

1. In av collapsible core for pile shells', in combination, an inner member, an ontermember movable relativelyto said'inne'r member and comprising a plurality of sections, and an hydraulic device arranged'to thrust against each of said outer sections and'react'against said inner member to cause movement ofsaid section relatively to said inner menrber.

2. .The'invention set fcrrth in claim-r in which `rnean's" is provided to support said hydraulic device on said inner' member.

3. In a collapsible core for pile sheils, in combination, an inner member having a head portion, an'outer member comprising a pinrahty of sections, and afp'lurality ofliyd'raulc devicesl support'led'byr Vsaid' head portion, each of said Hydraulic devices being operable to cause an upward push on said head portion anda downward push on one of saidonter sections. f v

4. Ina collapsible core' for pile shells, in combination, an inner member, am outer nienibe'rfconi rising sectibns mumble relatively tosadp inner member, a lever system operatively connecting eaeli of saidy sections to; sind' inner memkier,y and ani Hyd'r'aue device supported by said innen' member', said lever systems being' ope'rdbie' by hydrain'ic device to cause relsnve mcvemene-ef sind weer ieseively ai sind inner member;` fori illiel purpose dbseilbd i 5i En a cenapeiblederef 'fer in en, an inner member, 'unf omer @mener maximising4 swims; nomine rele- -ftvl'yto' @indiener member, w. eolv'liver iso system operatively connecting each of said sections to said inner member, and a hya draulic device, said toggle lever systems being simultaneously operable by said hydraulic device to Cause an upward push on said inner member and a downward push on each of said outer sections.

In testimony whereof I hereto aix my signature.

HERMAN R. SMITH.

Images