US1746011A - Bending tool - Google Patents

Description

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' Patented Feb. 4, 1 930 r r 1 UNITED STATES RUDOLPH c. P BATscHEmorrotnnqonro- Application filed December 5,'j,11 e2 s,erin 141L 34.

. Fig. 3 is a sectionon the line IIIIII,

Fig. 1; Fig. 4V is a section 'on the line IV'IV,

Fig. 2; and

Fig. 5 is a modification of the device. I

The tool comprises a head having aconvex arcuate face 14 of the desired curve, and an open groove or channel in said face constituting a seat for the work andterminatingat one end in a closed loop or terminus 3, the

' '7 [base of which is expanded'at itsouteryend to provide a clearance at 4. The depth. of the groove or channel is equal to the diameter of the work to be bent so that its arcuate edges may be flush with the euter side of the work.

Tubular conduit 1 is placed on support as cement floor 2, after the operator has thrust the conduit 1 through seat terminus 3 of the tool to the desiredpoint of clearance for the stock beyond the bend and with the stock extending from the seat 3 with clearance& on f i when the stock is of considerable length or the side remote from the support 2.

The seat 3has' taper portion 5 to opening 6 of channel form having concave root? and side flanges 8 of a proportion to be just flush with the stock 1. This channel seat or groove isof arc form extending from the terminal seat 3"and having at its remote terminal a ledge 9 as a footrest. Intermediate the extent of this tool, externally threaded boss 10 is in position for mounting thereon internally threaded element 11 thereby to extend radially medially the extent of. this are shaped seat of the bender. g In operation, after thrusting the stock 1 through the seat 3, as permitted by clearance A, the bevel portion. 5 is in position against the support 2 and the operator'with one foot 1 12 to hold the stock against the support 2-as 5 remote from the tool, will press his other foot is nicely re-formed into an arc of the radius 13 on the ledge 9 as 'away fromthe support} and inFig..1,'swing the handle llcounterclockwise as assisted by the pressure of foot 7 13 on the ledge 9 in riding-the stock 1 along into'the channel 7, 8, on-the pair of outer 5 edges 14: of thechannel as a rolling fulcrum. v; i

The dimension of this channel is suchth'at with the stock flush therewith and offthe transverse dimension-of the stock 1, the stock of this tool, which in practice say for Z conduit may be a a? radius of extent. This means that the tool may be definitely used for a desired contour and dimension of arc, either greater or less angular extent than the tool itself, for the tool thus may operatefor the 90 bend in the full swing and in less than the full swing in less degree, while a full. shifting may be had in make up to return bends or circles as desired. 7 v It is important, that the outer side of the stock be flush "with the outer faces of the flanges forming the rolling fulcrum, because if the stock projects radially beyond the flanges the thrust downward on the fulcrum 75 would tend to flatten the stock, while if the flanges project beyond the outer face of the stock, the stock will not be held to the inner bending surface of the seat so that improper deformation may follow. 7

In Fig. 5 lateralway 15 is provided so that has terminal fittings thereon, the tool may be placed in position with the stock laterally of the stock intermediate its length and thereafter used as hereinbefore set forth.

, What is claimed and it is desired to secure by United States Letters Patent is: e 1. For the bending of stock, a tool having a" seat of a form to be approached with the stock as lineally protruding therefrom, there to be held against a support, said tool having a ledge terminal :of said seat to be held'fo'r positionin'g the tool against the same support as :the stock, said tool from a remote terminal of said seat to the ledge terminal having a channel with its side walls providing a rolling fulcrum flush with the stock, andan operating handle for rocking the tool on said, ful crumin holding the tool against said support for rocking the stock along in the seat and V thereby bending the stock.

2. A portable hand operated conduit bending tool having a loop or terminus for engaging a supported side of the conduit, and a channel former or seat therefrom open'to- Ward said support, said channel former sides being approximately fiushwith the conduit, and an operating handle for rocking the tool on said sides as a rolling fulcrum.

3. A portable hand operated bending tool comprising a channel are seat with its side extending radially sufficiently to provide a rolling fulcrum coincident with the outer sur face of the curve to be bent, and an operating handle protruding radially from said seat. In witness whereof I affix my signature.

RUDOLPH o; PARATSCHEK.

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