US655259A

US655259A - Pipe-bending mechanism.

Info

Publication number: US655259A
Application number: US71881699A
Authority: US
Inventors: James Acton Miller
Original assignee: Individual
Current assignee: Individual
Priority date: 1899-05-31
Filing date: 1899-05-31
Publication date: 1900-08-07
Anticipated expiration: 1917-08-07

Description

Patented Aug. 7,1900.

.L A. MILLER. PIPE BENDING MEcHANlsM. #Application md may a1, 1899.) (No Modal.)

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Pit-TENT OFFICE.

'JAMES ACTON MILLER, OF NEW HAVEN, CONNECTICUT.

PIPE-BENDING Ml-:CHANlslvL JsrEcIEICATION forming peut of Letters Patent No. 655,259,01ated August 7, i19oo.

- Atplicttion'le May 31,1899. serial No. 718,816. (Erminia.)`

To all whom it may concern.-

Be it known that I, JAMES AcToN MILLER, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut,have invented certain new and useful Imprpvements in Pipe-Bending Mechanism,of which the following is a specification.

My invention relates to pipe-bending ma- 'chinery, and has for its object to provide improved mechanism for the rapid coiling ot' pipe, and particularly shortpipe elbows and returns or bends near the threads and of less than an entire convolution or coil.

The invention consists in the novel gripping device for seizing the threaded end of the pipe, the frictionless removable resistingbearing, andin the arrangement and combination and construction of parts, as hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification, Figure 1 is a rear elevation of my improved bending-machine, and Fig. 2 is a front elevation of the same. Fig. 3 is a plan view with the bending-former shown in centrali section on the horizontal line a; of Fig. 2, the gripping device and the resisting-bearin g released, and the pipe shown as placed ready for being secured to the bending-former. l the pipe gripped in place and the parts in position for the operation of bending. Fig. 5 is a vertical sectionalzview of the resistingbearing, taken fon'the line ir/,y of Fig. 4; and Fig. 6 is an endview of the same. Fig. 7 is a plan View of the machine withthe bendingformer and gripping de vice shown in horizon-2 tal section on the line o: oc of Fig. 2 and with` the gripping device in clamped position. Fig. 8 is a vertical section through the grippingstirrup on the line of Fig. 7.

Referring to the drawings, A designates the frame or table of the machine, having the upright power-shaft'B suitably journaled in the table. u Such shaft will usually be geared to derive the requisite power for bending large pipe, but the driving mechanism forms no part of thein'vention and need not here be shown, it being understood that the shaft may be rotat-ed by any suitable means or power.

. Upon the upper end of the power-shaft is secured a bending wheel or former D, having its periphery grooved to conform to the size groove of the bending-wheel, as shown.

Fig; 4 isja "plan view showing and'sha'pe of the 'pipe which it is adapted to bend. Said former does not comprise an entire wheel, as a portion of the circle is cut away on one side, as shown inr Figs. l, 3, 4,

Vand 7, and a steel part E is secured thereto,

having the threaded jaw e tangential to the jaw is threaded to it or receive the semicircumference of the ordinary threaded portion of the pipe, being practicrallyone-half part of asplit nut, and a corresponding jaw f,

forming the other half of the split nut, is secured in a stirrup F, which is hinged to the bending-former, the respective limbs of the stirrup passing upon the upper and lower sides of the wheel;` Said jaws or half-nuts are slightly counterbored, as shown at 7 7 in Fig. 7, to receive the smooth portion of the pipe above the thread suiiiciently to prevent the Vconcentration of the bending strain at the base of the thread, and consequent breaking of the pipe at that place. The fixed jaw may have a plain groove, ,as the strain -is least on that'part.

The stirrup is hinged to the bending-former by a pivot, having a central journal 44 fitting the bearing in the bending-former, and is provided at its ends with journals 55, eccentric to the central bearing, which are received in the bearings in the ends of the upper and lower limbs of the stirrup. A lever 66 is secured to the upper end of the pivot above the stirrup, and by means of Vthis construction the jaw f may be powerfully clamped upon the pipe by a quarter-,turn of said lever,wlienV the stirrup and its jaware swung around from the released position (shown in Fig. 3) to the clamping position, (shown in Fig. 4,) the lever in such clamping action being turned to bring the eccentric journal 44 on a dead-center, with the 'strain on the journals 55.

To prevent the pipe from swinging with the bending-former in operation, a resistance bearing or block H is provided, movably fitted between the ribs or guide-flanges h ou the frame as close as possible to the jaw c. `Said guides extend at a right angle to theV pipe, and the resistance -bearing is adapted to slide inthe groove or way thus formed toward or away from the pipe. The position of the resistance-block in operation is in j uxtaposition to the pipe, as shown in Fig. 4'; but for The the purpose of releasing the pipe or placingr it in the machinei-t is requisite that-the' bearing be moved back to the position in Fig; 3.'

This movement may be accomplished, preferabl y, by a parallel motion comprising a-pair of toggle-joints, with links h2 h3, coupled, re-

spectively, to-ears'z' on the `bearing and ears j on a bracket k on the frame, the opposite ends of each pair of links being connected together to form toggle-joints, and .the pair of joints being coupled by a link 88 to insure parallel movement of the joints. A handle or lever m is attached"- to l'one of the togglethe bearing without yielding in the wellknown action of toggle-joints. The resistance-bearin g may comprise a block H',grooved on the side adjacent the pipe to receive ther same, but is preferably provided with a semi-v` circular lshell 37 which is perforated, asf' shown in Fig. 5, to receive antifriction-ballsj n, projecting slightly-interiorly to the inner., face of the shell and bearing against the in The pipe as` ternal surface ofthe block H.

the operation of the bending-former.

In operation with the resistance-bearing..

drawn back and the gripping device released,

e', and the gripping device, with the jaw or half-nut f", then swung around upon it, las

shown in Fig. 4, which securely fastens the end inthe jaw-e', and the gripping device then being tightened by the eccentric action j and lever 66 the pipewill be held rigidlyV clamped tothe bending-former.

ance-bearing-then being thrustup to the may readily be disengaged from the machine by releasing .the gripping device and resistance-bearing,.as` hereinbefore described.

maybe similarly conducted into suitable" cavities 72 inthe AblockH and. discharged The resistupon the pipe through suitable orifices 73 as the vlatter' is .drawn .thronghtheresistance- `bearing for'the purpose of supercially chill- 7o ing the exterior surface of the pipe and in- Vsuri-ng greater compression of the particles of metal at the internal side of the bend, thus 'preventing to apconsiderablef degree the reduction of the original thickness of the pipe 75 whereA bent by stretching or extension of the outer side of the pipe as it passes around the bending-former.

To lighten the resistance-block, flanges u are cast upon the lower side thereof to be re- 8o ceivedbetween the guide-flanges Vh' on the table, it being unnecessary that all said space between the flangesb'e filled withmetal; A shoulder lOis provided on fthe shaft to support the bending-former, and a nut 12 atthe 85 upper end of Athe shaft Vsecures the bendingformer in place, but permits readyremoval thereof for chan-ging for different sizesof pipe. The resistance-bearing may also readily be changed if .the 'bracket -Zc isbolted or other- 9o nation of a bending-former, a lixed jawor l .'.half-nut Vsecured thereto axiallyl tan gential4 to it is drawn through the groove thus bears j against the balls, reducing the friction and facilitating theprocess of pipe-bending in the curve of ,the .bending-former, and. amov- 'able jaw or half-nut hinged orfpivoted .tothe bending-former and comprising with thetxed jaw a split nutfor receiving.andclampinga vroo threaded pipe, substantially as and for the i purpose specified. asfshown in Fig.'3, the pipe may be placed' with its threaded end 9 inthe jaw or half-nut 2. uIn pipe-bending mechanism the combination ot' a y bending-former, a fixed Yjaw or half-nntsecureld thereto axially Ytangential to 1 o 5 the curve of the'bending-former xand a movable jaw or half-nuthinged .or pivoted to the .bending-former by-an eccentric and comprising withthe fixed jaw a split nut for receiving and clampinga threadedpipe substantiallyas I 1o and for the purposespecifled.

'3. In pipe-bending mechanism the .combination of ,a bending-former a fixed jaw .or half-.nut secured thereto axially tangential to the curve `of thebendingformera stirrup 115 spanning the bending-former and .hinged or .pivoted thereto, ay jaw orfhalf-nutcarried by the stirrup` and comprising with the fixed` j aw a split nut for receivinga threaded pipe, and

A clamping means for forcing the same together, 12o I-n the action of this machine the use of a substantially asand forthe purpose specified.

4.k In v pipe-bendingmechanism the combination of a-bendingfformer, ,ariixed `jaw or half-nut secured thereto axially tangential to 1 2 5 the curve of the bending-former a'stirrup carrying a jaw or half-.nut and received upon or spanning the bending-former pivot-ally connected thereto and eccentric yclamping lmeans for compressing the movable jaw Vupon Athe 13o 5. In pipe-bending mechanism the colnbination of a bending-for1ner, clamping mechanism for securing a pipe .to the former, a resistance-bearing fitting the pipe on the side of the strain and antifriction rolls or balls arranged in said bearing in a series around the periphery of the pipe-groove to sustain the thrust of the pipe against the bearings substantially as and for the purpose specified.

6. In pipe-bending mechanism the combination of a bending-former', clamping mechanism for securing a pipe to the bendingformer, a movable resistance-bearing fitting the pipe on the side of the strain, friction rolls or balls arranged in said bearing in a series around the periphery of the pipe-groove to sustain the thrust of the pipe thereon and mechanism for throwing the bearing into Working position against the pipe or releasing it therefrom, substantially as and for the purpose specified.

7. In pipe-bending mechanism the combination of a bending-former, clamping-mechanism for securing the pipe to the bendingformer, a movable resistance-bearing fitting the pipe on the side of the strain, friction rolls or balls arranged in said bearing to sustain the thrust of the pipe thereon, and a togglejoint acting between the bearing andan abutment on the frame and adapted for throwing the bearing in working. position against the pipe or releasing it therefrom substantially as and for the purpose specified.

8. In pipe-bending mechanism the combination with a resistance-bearing of a pipe having an outlet within the pipe-receiving cavity of the bearing and adapted for connection with a cooling-liquid supply for chilling the surface of the pipe preparatory to bending substantially as and for the purpose specifled.

9. In pipe-bending mechanism the combination of a bending-former, threaded clamping mechanism for securing a pipe tothe former, and a resistance-bearing provided with a groove or way fitting and adapted to receive the longitudinal semisection of the pipe and sustain the thrust thereof substantially as and for the purpose specified.

lO. In pipe-bending mechanism the combination of a bending-former, a fixed jaw or half-nut secured thereto axially tangential to the curve of the bending-former, and a movable jaw or half-nut hinged or pivoted to the bending-former and comprising with the fixed jaw a split nut for receiving and clamping a threaded pipe, said jaws being provided with orifices within their threaded grooves or ways adapted to be connected with a cooling-liquid supply and to discharge the same upon the heated threaded portions 'of the pipe, substantially as and for the purpose specied.

11. In pipe-bending mechanism the combination of a bending-former provided with a pipe-receiving groove or seat, a threaded halfnut for engaging and clamping the threaded end of a pipe in said groove or seat, and clamping means for operating and holding the halfnut in position on the former, substantially as and for the purpose specified.

JAMES AGTON MILLER. Witnesses:

LINUS BARNES, GEORGE L. BARNES.