US2557579A - Cold pipe bender - Google Patents

Description

June 19, 1951l L. 'a'.sTRlNGFlELD 2,557,579

com PIPE BENDER Filed Nov. 8, 1948 2 Sheets-Sheet 1 MH- lw; O

Efuuuouennunun [6 000000 CIOOOOOO G/ Inventor June 19, 1951 L. T. STRINGFIELD v 2,557,579

COLD PIPE BENDER Filed Nov. 8, 1948 2 Sheets-Sheet 2 Lam, r sm'ngf/b/d IISIIIIIIHISIIIS{ISQISIISHISIISHISINISI R24 if P F/g.6`.

Inventor Patented June 19, 1951 `com) PIPE BENDER Luther T. Stringfeld, Austin, Tex., assigner of forty-nine per cent to Tate T. Stringlield, Austin, Tex.

Application November 8, 1948, Serial No. 58,963

1 Claim.

This invention relates generally to tools for bending material, and more particularly to a cold pipe bender comprising a rotatable plate, means for rotating this plate, xed upright members on the plate and a set of dies selectively adjustably mounted on said plate.

A primary object of the invention is to provide a cold pipe bender which may be used to bend various sized pipe through various angles without mutilating the pipe, that is, without over stretching, flattening or buckling any portion of the pipe. v

Another object of this invention is to provide a cold pipe bender which may be used to produce very small radius bends, even in relatively large diameter pipe. Y A

Still another object of this invention is to provide a pipe bender in which the adjustment thereof is extremely simple in order to adapt the bender for different sized work.

Still another object of this invention is toV provide an improved die which will allow the convenient placement of the work in juxtaposi-l tion with xed upright members on the plate, thereby allowing more accurate bends to be produced, the die being fashioned in two sections, the upper portion being easily removable,

And a last object to be mentioned specically is to provide a pipe bender of the class described which is relatively inexpensive and practicable to manufacture, which is extremely safe, convenient and simple to use, and which give generally eicient and durable service.

With these objects definitely in view, this invention resides in certain novel features of construction, combination and arrangement of elements and portions which will be hereinafter describedin detail in the speciiication, particularly pointed out in the appended claim, and illustrated in the accompanying drawings which form a material part of this application, and in which:

Figure 1 is a top plan view of the assembled pipe bender with a section of work therein and represented as having been bent through a right angle;

Figure 2 is a fragmentary plan view of the structure shown in Figure 1, the movable elements and the work being shown in the positions assumed when the work has been placed in the machine and before a bend has been made therein;

Figure 3 is a vertical sectional view of the supporting table, rotatable plate and driving pinion, the view being taken on the line 3 3 in Figure 1 and the die and work being' removed;

Figure 4 is a three dimensional view of a removable axis pin used for selective securement.

of the dies and apertures in said rotatable plate;

Figure 5 is a vertical sectional View, fragmentary in character as related to the rotatable plate, and adapted to illustrate the construction of one of the set of dies provided with this machine;

Figure 6 is a grouped view of the two complementary sections of one of the dies.

Similar characters of reference designate drawings as comprised of angle iron, marginal supporting members I2 which may also be of angle iron'mounted to the members IU, and a table III bolted to the supporting members I2 as illustrated at I6. The specic construction of this table support is not particularly material. in this application, the essential feature thereof l being provision of rigid support for a bearing I8 whereby a pinion shaft 2U is rotatably mounted. The table I4 will ordinarily be horizontal and the pinion shaft 20 will be vertical. A drive pinion 22 is carried on the upper end of the drive shaft 2G and disposed above the top of the table I4.

The plate 24 of circular shape is rotatably mounted by a bearing 26 and a stub shaft 28 on the upper surface of the table I4, and it will' be noted that the periphery of the plate 24 is.

provided with gear teeth 30 which are in constant mesh with the teeth of the pinion 22. Any

suitable means may be used to drive the pinion shaft 20, it being envisaged in this invention that the pinion shaft will be driven by a small electric motor (not shown) or by a hand crank. `with a complement of reduction gears (not shown) Y be clearly evident from an inspection of Figures 1 and 2. The said two lines will ordinarily be right angularly disposed. These upright members .are illustrated as havingV square heads and cylindrical attachment Shanks 34 and 35, respectively, as illustrated best in Figure 5, and the apertures in the plate 24 adapted to receive the shank portions 3G will necessarily also be cylindrical.

The plate 24 is also provided with diametrically and chordally disposed lines of apertures 38 to receive a shank 48 of a removable axis pin 42 which is provided with a square head 44. The square head 44 is used for the selective support of dies indicated generally by the numeral 56. It should be here noted that the apertures in the plate which are adapted to receive the shank portions 38 of the upright members 32 may be of the same diameter as the apertures to receive the Shanks 49, so that the upright members and the axis pins 42 are interchangeably and selectively securable in a very wide plurality of combinations to provide for variation in the effective or operational spacing therebetween, so that different sizes of work, represented by the pipe 48 may be accommodated and bent by the machine..

The set of dies 416 of various sizes is provided with this machine, and each die is constructed according to the principles illustrated in the drawings. Each die is comprised with a square bore 56 disposed centrally thereof to receive the head 41% of the removable axis pin 42. Each of the sections 58 and 52 is peripherally recessed as at 56, and when the die is assembled the recessed portions 56 are adjacent to each other and thus provide a. peripheral groove to receive the work 48. Studs 58 are used to removably secure the sections 50 and 52 together, these studs being inserted through apertures 50 in section 52 and screwed into apertures 62 in the section 59. It will be realized that the die is divided into two sections in order to facilitate insertion of the work 88 thereinto, while the work is in juxtaposition with the squared head portions 39 of the upright members 32.

The operation of this invention will be clearly understood from the foregoing description of the mechanical details thereof, taken in connection with the above recitation of the objects sought to be achieved by this invention.. In recapitulation, the upright members 32 will be disposed of the plate 24 in such manner as that illustrated in Figures 1 and 2, it being understood that all of the upright members illustrated in these figures need not be simultaneously positioned upon the plate. The Figures 1 and 2 should clarify the feature of this invention relating to the adaptability of the pipe bender for making a considerable variety of different radiused bends in instances where more than one suchV die is provided with the machine. Obviously, one end (not shown) of the work is held against movement while the plate 24 is r0- tated by the pinion 22 and the power means used with the machine. In using the machine, the` operator may so arrange the work that this work is not necessarily stretched, flattened or otherwise deformed other than in the production of the regular bend, and in the light of the foregoing description it will be evident that all of the objects cited above are fully achieved by this invention.

Many minor variations may be made in the exact construction and the proportionment of the various elements of this invention all within the spirit and scope thereof. Accordingly limitation of the scope of this invention should be determined only in accordance with the proper interpretation of the subjoined claim.

Having described the invention, what is claimed as new is:

In a cold pipe bender, a rotatable plate having a circular periphery with teeth thereon, a gear provided with teeth enmeshed with the teeth on said plate and adapted to impart rotation to said plate, means supporting said plate and said gear for rotation, said plate being provided with rows of apertures arranged both diametrically and chordally of said plate, upright members arranged in rows and mounted in selected apertures on one side of said plate, each of said members having at least one flat side to constitute a supporting surface for a work piece, a lower die section and an upper dies section, means mounting said die sections on said side of said plate eccentrically of said plate, said die sections being peripherally recessed on adjacent sides to provide a work receiving groove to accommodate a lateral surface of the work opposite from the lateral surface which is adapted to contact the fiat sides of said members, and means releasably fastening said upper die section to said lower die section so that said upper die section may be removed from the lower die section to provide an entrance for the Work.

LUTHER T. STRINGFIELD.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 397,712 Fowler Feb. 12, 1889 790,600 Stambaugh May 23, 1905 1,042,112 Hartman Oct. 22, 1912 1,299,583 Lacourse Apr. 18, 1919 1,324,940 Theberath Dec. 16, 1919 1,610,201 Cavagnaro Dec. 7, 1926 1,795,188 Wagenbach Mar. 3, 1931 1,849,181 Francis Mar, 15, 1932 2,055,955 Wagenbach Sept. 29, 1936 2,444,719 Bath July 6, 1948 FOREIGN PATENTS Number Country Date 768 Great Britain Jan. 18, 1888 126,512 Great Britain May 15, 1919

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