Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS781279 A
Publication typeGrant
Publication date31 Jan 1905
Filing date15 Aug 1904
Priority date15 Aug 1904
Publication numberUS 781279 A, US 781279A, US-A-781279, US781279 A, US781279A
InventorsAlbert Froehlich
Original AssigneeAlbert Froehlich
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Means for bending pipes.
US 781279 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

v No. 781,279. PATENTED JAN.'31, 1905.



. on said lever.

UNITED ST TES" Patented January 31, 1905.



SPECIFICATION forming part of Letters Patent No. 781,279, dated J anuary31, 1905. Application filed August 15, 1904. Serial No. 220,699.

To all whom it may concern.-

Be it known that LALBERT FRoHLIoH, a resident of Newark, Essex county, inthe State of New Jersey, have invented certain new and useful Improvements in Means for Bending Pipes, of which the following is a specification.

The present invention relates to means for bending pipes in which the usual filling of the pipe to be bent with sand, balls, pitch, or other material to prevent the breaking of the pipe is dispensed with. To this end the pipe is bent around the periphery of a correspondingly-shaped former under the action of a pressure-lever, which lever, however, does not act directly on. the pipe to be bent, but by means of a pressing-piece pivotally mounted continually adjusts itself at the bending-point tangentially with relation to the former, the pipe isalways closely embraced at its bending-point by the pressing piece, so that the material cannot escape laterally and the pipe cannot break.

The invention further consists inthenovel details of improvement and combination and arrangement of parts, which will be hereinafter described and finally summarized in the appended claims.

Reference is to be had to the accompanying drawings, forming part hereof, wherein Figure 1 represents a side elevation of the device. Fig. 2 is a side elevation, but showing the bending mechanism in the act of bending a pipe. Fig. 3 is a plan view of Fig. 2 with some of the parts removed, and Fig. 4 is a cross-section taken on a line 4 40f Fig.1. Similar characters indicate corresponding parts in all the views. 1

On the base-plate 1 the former2 is rigidly secured by means of the bolt 3 and nut3. The former 2, around which the pipe 4 is to be bent, is provided with two difierent semicircular grooves or channels 5 and 6, so that pipes of different diameters can be bent. If

the groove v6 is to be used, the former 2 is turned about one hundred and eighty degrees and is then fixed again, to which end stoppins 7 7 are used, which during the operation prevent the former from being turned.

While the pressing-piece then The pipe 4, as seen, in Fig. 1, is first clamped between the upper part of the former 2 and the clamping-block 8, which, by means of the screw 9, can be forced against the pipe 4. The clamping-block 8, as seen from Fig. 4, is angularly bored out at its lower edge, so that it will fit onto every pipe. The former 2 is provided opposite the clamping block 8 with the rectilinear part 9 in order to permit the pipe 4 to be firmly clamped.

Pivotally mounted on the bolt 3 is an arm 10, having pivoted to its end, by means of the bolt 12, the pressurelever 11. The arm 10 normally bears firmly on the base-plate 1 and,

if necessary, may be fastened to the said baseplate, so'that the bolt 12 forms a fixed fulcrum for the pressure-lever l1. Pivoted to the latter by means of the pivot 13 is the pressingpiece 14, which in the illustrated structural form is entirely rectilinear, but may be also slightly curved. At its lower pressingface the pressing-piece 14 is semicylindrically bored in a similar manner as the periphery of the former 2.

In the'position shown in Fig. 1 the lower. pressing-face of the pressing-piece 14 is just in contact with the pipe 4 to be bent. If the pressure-lever 11 is now depressed into the position 15, the pressing-piece 14, which is adapted to'turn around the pivot 13, adjusts itself continually at the bending-point of the pipe, so as to occupy a position tangential with respect to the pipe and the periphery of the former. (See position 16.) The pipe therefore is always closely embraced by the former 2' and the pressing-piece 14 at the bending-point, so that at this point the material cannot escape laterally, and the breaking of the pipe at the bending-point is therefore pre-- vented. In this manner one can bend, by depressing the lever 11, the pipe 4 around a certain portion of the periphery of the former 2, so that the end'of the pipe is forced into the position 16, Fig. 1. When a further bendingof the pipe is no longer possible, the arm 10 is brought into the position illustrated in Fig. 2, the pressing-piece 14 assuming a rectilinear position again on the end of the pipe. By depressing the lever 11 the pipe is bent in a similar manner as before into the position 18, Fig. 2. In this way the pipe can be bent in several stages around the periphery of the former 2 without danger of breakage.

In bending stronger pipes the lever 11 can be depressed with correspondingly greater force by the insertion of two further levers 19 20. The lever 19 can be mounted to this end on a bolt 21 of the pressure-lever 11, whereas the lever 20 can be pivotally mounted on the central bolt 3 of the former. The lever 20 has at its end an open slot 22, which is engaged by the pin 23, secured to the end of the lever 19. If the lever is then depressed into the position 23, the pressure lever is moved downward into the position 24:, so that a considerably larger force is exerted on the pipe to be bent.

With my improved arrangement the bending of the pipe around the periphery of the former 2 can be readily effected in various stages.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. In a pipe-bending device the combination of a base, a reversible formercarried by the base, grooves within the surface of the former, the said grooves being of different sizes, a

clamping means adapted to clamp a pipe in said grooves, and a pressing-piece adapted to bend the pipe, to conform with the shape of the former, when force is applied thereto.

2. In a pipe-bending device, the combination of a base, a removable reversible former carried by the base, means for securing the former to the said base, grooves, of different sizes within the surface of the former, means for clamping a pipe in any one of the said grooves, and apressing-piece, adapted to bend the pipe, to conform to theshape of the former, when force is applied thereto.

3. In a pipe-bending device, the combination of a base, a reversible former carried by the base, the said former having a rounded edge with a Hat surface at a tangent thereto, a groove extending along the said surface and rounded edge, a clamping means adapted to clamp a pipe in the groove at the said fiat surface, and a pressing-piece adapted to bend the pipe to conform to the said rounded edge of the former, when force is applied thereto.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3447355 *13 Sep 19663 Jun 1969Bethlehem Steel CorpHook bolt bending header tool
US4825678 *4 Apr 19882 May 1989Alpha Maschinenbau AgThree-dimensional bending apparatus
Cooperative ClassificationB21D5/04