US1326916A - Sheet-metal-elbow-forming machine - Google Patents

Description

A. DIECKMANN.

SHEET METAL ELBOW FORMING MACHINE.

APPLICATION FILED JUNE 2,1915- Patented Jan. 6; 1920.

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A. DIECKMANN.

SHEET METAL ELBOW FORMING MACHINE.

APPLICATION FILED JUNE 2, I915.

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SHEET METAL ELBOW FORMING MACHINE.

APPLICATION FILED JUNE 2, 1915.

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ADOLF DIECKMAINN,

PATENT orrioa OF CINCINNATI,

OHIO.

SI-IEET-1VIETA.L-ELBOW'-FORMING MACHINE.

Application filed June 2,

To all whom it may concern Be it known that I, ADoLr DIECKMANN, a citizen of the United States, residing at Cin cinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Sheet- Metal Elbow- Forming Machines, of which the following is a specification.

My invention relates to improved mechanism to produce sheet metal elbows of various types or patterns. One of its objects is to provide improved mechanism to first corrugate or shape the elbow as to its cross sectional pattern and then to crimp or fold it to produce the elbow curve. Another object is to provide improved mechanism to carry out these operations conjointly and in harmony and expeditiously and with a minimum injury and strain upon the sheet metal of the elbow. My invention also comprises certain details of form, combination and arrangement all of which will be fully set forth in the description of the accompanying drawings in which:

Figure 1 is a view partly in section with portions broken away, section being on line 2 z of Fig. 6.

Fig. 2 is a diagram illustrating the cross sectional pattern of one type of elbow to be produced.

Fig. 3 is a similar diagram illustrating another type of elbow.

Fig. 4: is a vertical section on line 00 m of Fig. 1.

Fig. 5 is a detail of the elbow feeding mechanism detached.

Fig. 6 is a front end elevation of Fig. 1. Fig. 7 is a diagram illustrating a modification of Fig. 6.

Fig. 8 is a similar diagram illustrating another modification.

The accompanying drawings illustrate the preferred embodiments of my invention, in which A represents the frame of the machine on which is mounted a mandrel B. The sheet metal D from which the elbow is to be formed in the shape of a cylinder or tube preferably having an open seam at one side is slipped from the forward end over the mandrel until it engages or abuts at one end against a feeding sleeve which is fed step by step forward upon the mandrel. A locked seam may be employed in the elbow blank. As illustrated the feeding sleeve comprises a split sleeve or collar 2 which has a recess 8 to receive the end of the tube Specification of Letters Patent.

Patented Jan. 6, 1920.

1915. Serial No. 31,769.

D and a tapered shank 4 to seat in a tapered recess in the collar 5. The collar 5 has two rearwardly projecting arms 6 which pass through guides at the rear of the frame A on opposite sides of the mandrel and have teeth 7 upon one face to be engaged by the feeding pawls 8 and also by the locking pawls 9 which locking pawls are pivoted stationarily relative to frame A. The feeding pawls 8 are pivoted to the arms 10 of a reciprocating bar 11 which is reciprocated by means of a cam roller 12 engaging a cam groove in cam 14 carried by the main driving shaft E. The collar 5 also carries an arm F having a cam face F which engages rollers 15 connected to a clutch lever 16 which moves a clutch member 17 on the main shaft E to clutch and unclutch the cam 18 thereto.

A stationary ring H carried by or formed integral with the frame A serves as a sup port or bearing for a ring 19 which carries a series of rollers 20 and is movable backward and forward through a partial revolutionby means of a crank pin 24 a bar 21, cam rollers 22 and a cam 25 on the shaft E. A series of jaws K are pivotally attached at 26 to the ring H and their free tapered ends 27 are engaged by rollers 20 as the ring 19 moves in one direction to force said jaws toward the mandrel so as to clamp the tube D between said jaws and the mandrel, and also to cause the tube to assume the corrugated or other cross sectional pattern of the elite rior of the mandrel. As the ring 19 moves in the opposite direction the jaws K are released a-nd retracted by engagement of the studs 28 carried by the ring 19 with inclined faces 29 of the jaws, thereby enabling the tube to be fed forward before the jaws K again engage and clamp the tube to the mandrel. The jaws K may be retracted by springs if desired.

In front of the ring H are a series of crimp forming blades 30 which are supported relative to the frame A either pivotally or by means of sliding engagement, clepending upon the pattern of elbow to be formed. The edges of these blades are practically the counterpart of the cross sectional pattern of the tube, and said blades are moved to and from the tube to produce an indentation 31 annularly, and eccentric to, and nearly encircling the tube by forcing the metal inwardly over the edges of said blades. These indentations are deepest in the throat of the elbow or inside of the curve, and serve to take up the surplus metal in forming the curve.

As illustrated in Fig. 6 the two upper blades are pivoted at 32 to a plate 32 attached to ring H" while the two lower blades slide in guides, .33. carried by the upper blades. The lower blades are pivoted at 34 to angle levers 35 which are pivoted at 36 to ring H and their free ends are connected by links 37 to a sliding spring retracted plate 38 mounted on frame A and reciprocated by cam 18 on shaft E. Links 39 also connect the upper blades 30 to the levers 35. Movement of plate 38 downwardly swings the upper blades inwardly and moves the lower blades both inwardly and upwardly, to approximately the position indicated in dotted line Figs. 7 and 8.

Asillustrated in Figs. 7 and 8 four blades 30 are mounted in guides on the frame A toslide substantially radially to and from the tube, being actuated by means of suitable cam actuated levers, not shown, and which would vary according to the elbow pattern employed.

Mounted within the mandrel B is a plunger L which has a limited movement endwise relative to the mandrel. The plunger L is connected by a rod 40 having an enlarged head and a cross-pin 42 with an inclined slot in a bar l-t which travels in guides 455' on frame A and is actuated by a cam 46 on shaft. E. The forward end of the plunger when in its forward position is slightly inside the blades 30, Plunger L also carries an auxiliary plunger L which is connected thereto by a ball and socket joint 47 which permits a limited movement of plunger 11 relative to plunger L. TheplungerL in its forward position is outside of the blades 30 so that the crimp 31 is formed between the crimping blades 30. After each crimp 31.

is formed the head or plunger is retracted and the auxiliary plunger L lays the inwardly projecting crimp over flat upon the inner face of the tube or elbow by being drawn through or over the crimp. The tube is then fed forward and also the plungers ready to form another crimp. The clutch 17 is again dlsconnected for the last two or three forward steps of the elbow feed.

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tion without departing from the principle of my invention. 1

Having described my invention what I claim is:

1. A sheet metal elbow forming machine comprising a mandrel having on its eX- terior a non-cylindrical pattern, a frame encircling the free end of said mandrel, an exteriorly supported and inwardly movable crimp former located close to the free end of said mandrel, a series of segmental jaws the counterpart of the pattern of said mandrel mounted upon said frame and movable to and from said mandrel to shape and clamp an elbow blank upon said mandrel during the formation of a crimp, a main plunger having its exteriorof the same pattern as that of the mandrel, located inside of the elbow blank and between the crimp former and the free end of the mandrel and movable endwise to and from the free end of the mandrel, and an auxiliary plunger of the pattern of the mandrel jointedl-y connected to said main plunger and movable therewith to a position outside of said crimp former.

2. A sheet metal elbow forming machine comprising a mandrel a frame encircling the free end of said mandrel, an eXteriorly supported and inwardly movable crimp former located close to the free end of said mandrel. a series of segmental jaws pivotally mounted upon said encircling frame with their free ends movable to and from said mandrel to clamp an elbow blank upon said mandrel during the formation of a crimp, an annu lar shaped member rotatably mounted upon said encircling frame and provided with members to engage cam faces on said jaws to move said jaws to and from said mandrel, a main plunger located between said crimp former and the free end of said mandrel and movable endwise to and from said mandrel, and an auxiliary plun er jointedly con nected to and movable with said main plunger and located outside of said crimp former.

3. A machine for forming sheet metal elbows comprising a mandrel to support the elbow blank, clamping jaws overhanging the end of said mandrel to clamp the elbow blank to the mandrel, mechanism to successively form inwardly projecting eccentric crimps in h lb w bla k outs de of said jaws, and a plunger reciprocating endwise within the elbow blank and movable into the overhanging portion of the clamping jaws.

4. A machine for forming sheet metal elbows comprising a supporting mandrel having a cylindrical section and a noncylindrical section, clamping jaws opposite said non-cylindrical mandrel section and overhanging the end of said mandrel to form longitudinal corrugations in the cylindrical elbow blank, means at the overhanging end of said jaws operating from the exterior to successively press inwardly, projecting eccentric crimps at intervals in the elbow blank, and a plunger reciprocating endwise within the elbow blank and movable into'the overhanging portion of the clamping aws.

5. A sheet metal elbow forming machine comprising a base, a hollow stationary mandrel carried thereby and having at its exterior a non-cylindrical pattern desired in the elbow, means to feed an elbow blank longitudinally of said mandrel step by step, a series of segmental jaws assembled about the free end of said mandrel to compress the elbow blank to the exterior pattern of said mandrel, an annular shaped frame car ried by said base and encircling the free end of said mandrel upon which said jaws are pivotally mounted, means carried by said loop shaped frame to periodically open and close said jaws, a plurality of crimp forming blades located forward of the free end of the mandrel and movable periodically toward and from the elbow blank to form inwardly projecting eccentric orimps in theelbow blank, a main plunger guided by and movable within said hollow mandrel and of an external pattern to correspond with the external pattern of the mandrel, an auxiliary plunger having an external pattern to correspond with that of the main plunger and jointedly connected with said main plunger, means to periodically reciprocate said plungers endwise relative to said mandrel, and a main driving shaft to actuate said movable members in synchronism.

6. A sheet metal elbow forming machine comprising a base, a'hollow mandrel mountedupon said base and having exteriorly a rear cylmdrlcal portion and a forward non-cylindrical portion of the pattern desired in the elbow, means to feed an elbow blank longitudinally of said mandrel step by step, a series of segmental aws assembled about the free end of said mandrel to compress the elbow blank to the external pattern of said mandrel means to periodically open and close said jaws, a plurality of crimp forming blades located forward of the free end of the mandrel and movable periodically toward and from the elbow blank to form inwardly projecting eccentric crimps in the elbow blank, a main plunger guided by and movable relative to said hollow mandrel and of an external pattern to correspond with the external pattern of the free end of the mandrel, an auxiliary plunger of like pattern jointedly connected to said main plunger and movable therewith, means to periodically reciprocate said plungers endwise relative to said mandrel, and a main driving shaft to actuate said movable members in synchronism.'

7. A sheet metal elbow forming machine comprising a mandrel having at its exterior a non-cylindrical pattern desired in the elbow, a series of segmental jaws arranged. about the free end of said mandrel to compress the elbow blank to the external pattern of said mandrel, means to periodically open and close said jaws, a plurality of crimp forming blades located forward of the free end of the mandrel and movable periodically toward and from the elbow blank to form inwardly projecting eccentric crimps in the elbow blank, a main plunger guided by and movable relative to said mandrel having at its exterior a pattern similar to that of said mandrel, an auxiliary plunger exteriorly of the pattern of the mandrel and jointedly connected to and movable with said main plunger, means to periodically reciprocate said plungers, endwise relative to said mandrel, and a main driving shaft to actuate said movable mem bers in synchronism.

In testimony whereof I have aflixed my signature in presence to two witnesses.

AD OLF DIE CKMANN Witnesses:

C. W. MILES, W. THORNTON Boennr.

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