US1548893A - Flanging machine - Google Patents

Description

Aug. 11, 1925. i 1,548,893

H. MccABE- FLANGING MACHINE Filed Feb. 25. 1921 Patented Aug.. 1l, 1925.

rares HUGH lVIcCABE, 0F LAWRENCE, MASSACHUSETTS.

FLANGING MACHINE.

Application filed February 25, `1921.

To all 'whom t may concern.'

Be it known that I, I-IUGH MCCABE, a 'citizen of the United States, residing at Lawrence, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Flanging Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

rThis invention relates to a fianging machine and more particularly7 4to a iianging machine of the type disclosed in the patent to Hugh McCabe No. 1,030,416, dated June 25, 1912.

Flanging machines of this type operate to 4form a flange on a metal plate'in successive steps. Adjacent increments of the work along an edge thereof are successively bent down until the entire flange has been bent to a position corresponding to the first step in the tlanging operation. Thereafter the flange is incrementally bent through the second step and so on until the completed flange has been formed. In the patent above referred to, the Hanging machine is provided with a bender 20 mounted upon a segmental bender carrier 190 having a segmental gear 240. A reciprocatory rack 250 capable of being swung into and out of engagement with the segmental gear 240 serves to oscillate the bender 20 through a normal angle of oscillation, approximately 40. During the first step of the Hanging operation, the bender is repeatedly oscillated through its normal angle of approximately 40o to form successive incremental bends in the flange portion of the plate, the work being fed along through the machine after each increment of the flange has been bent. Because of the resiliency of the metal, the flange after having been bent down in any step, springs back somewhat. The spring-back of the metal in this manner would operate to interfere with the feeding 0f the work through the machine during the succeeding step in the Hanging operation. Provision is made in the above mentioned patent for repositioning the rack 250 with ,relation to the segmental gear 240, so that during such successive steps of the flanging operation, the bender is returned, after each increment of the flange has been turned down, to a position clear of the portion of the lflange to be Serial No. 447,794.

bent down. The rack is repositioned in this manner between successive steps in the Hanging operation until the completed flange has been formed.

In the above mentioned patent mechanism'is disclosed for accomplishing the repositioning of the arc of oscillation of the bender to accomplish this result. This mechanism includes a dog 500 adapted to be automatically moved into the path of the collar 380 whenever the rack is disengaged between successive steps in the langing operation ofthe bender.k Duringv the return of the bender to its initial position, however, the construction of the mechanism is such as to require a hand operation of the operator t0 move the dog 500 (by means of a handle 514) to position the dog in the path of the collar 380. The dog 500 is allowed to remain in the path of the collar 380 during the first two successive steps incident t-o the return of the bender to its initial position, being removed from the path of the collar 380 during the final step, this being done by manually swinging the handle 514 to the right. It will therefore be apparent that the mechanism disclosed in the above mentioned patent, while operating automatically during the advance of the bender requires manual operation during the return of the bender to its initial position.

Theobject of the present invention is to provide a 'Hanging machine of this type with mechanism for positioning the are of oscillation of the bender to enable the work to be fed freely through the machine, not only during the advance of the bender but during the successive steps in the return of the bender to its initial position.

The invention consists in the langing machine hereinafter described and particularly defined in the claims.

The drawing illustrates theJ preferred embodiment of the invenion in side elevation.

The construction and operation of the Hanging machine in general is the same as that disclosed and fully described in the above mentioned McCabe Patent No. 1,030,- 416 to which reference may be had.

The mechanism for positioning the arc of oscillation of the bender to enable the work to be fed freely through the machine comprises a positioning device 51, mounted on the rod 390, and held from longitudinal movement on the rod 390, and held from longitudinal movement on the rod by means of two stop collars 52 and 54, a compression and torsion coil spring 55, by expansion tending yieldingly to press the positioning device 5l against the stop collar 52, and by torsion to hold the .device in an inoperative or turned down position. One end ot the positioning,` device 51 is provided with an ottset nose Gl, shown in the drawingl in its operative position. This nose is adapted to be struck by the collar 380 projecting from the side of the rack when it is inoperative position, and to pass by it when it is in turned down 0r inoperative position. Then the collar 380 strikes the end ot the positioning device 5l. it shuts ottx the air valve and stops reti-'acting movement of the rack by the means described in said patent. ln the present construction when the collar 380 strikes the nose (Si, it stops the retraeting movement of the rack at an earlier point.

rlhe clamping wedge 59 is operated by `the 'bell crank lever 80 and piston rod 99 i'rom the cylinder 100, as in said patent. Connections are provided between the wedge operating piston rod 90 and the positioning device tor turning the latter up in certain stages in the operation of the machine, and turning it .farther up and locking it up in other stages ot the operation or the man chine, and to this end the piston rod A90 is provided with a bracket 91 which is secured to the piston rod 90, and which supports one end of the lliositioning device operating rod 92. This rod 92 is further supported by a plate 93 which is fastened on the cylinder 100. The end ot the `rod 92 -is provided with a collar 9i, and a spring 95 takes against the collar at one end, and against a chain .lever G2 at the other end. The rod 92 also carries a pulley bracket 6B carrying` a chain pulled. The chai-n lever 62 pivoted on a stud 67 in the frame ot the machine en gages the spring 95 at its upper end, and near its upper end is attached a chain 60 which runs from the lever over the pulley and down to the positioning device 5l. An

arm depending from the stud 6T beloviT the lower end of the chain, lever 62, is adapted to be engaged by a. lug 24d on the segment 240 when the segment occupies its `position of extreme throw, as shown in the drawing. lilith the segment in this position the chain lever 62 occupies the yposition shown, and the releasing of the clamping wedge 50 operates to move the pulley bracket 63 to the left, so as :thereby to exert a pull upon the chain GO sutlicient to turn the 'positioning device to its operative po-sition and a little beyond, so as to permit the latch .pin 5G to engage `the recess 58 in the positioning device 5l,

thus latching and holding :the positioningl device in its operative position. lVhen the segment occupies intermediate positions it will be observed `that the lug 244 not being in engagement with the depending arm 65, the

chain leverl (32 occupies a position inclined to the left, and therefore an added length of chain is provided, so that in the positions ot the segment where the rack is disengaged therefrom, or, in other words, in the disengaging positions ot the segment, the chain vonly litts the positioning` device into operative position without turning it tar enough to cause the latch pin 5G to engage the recess 5S so as thereby to hold it in its operative position. lheretore, in the use of the machine, attcr the successive increments ot one bend ot the flange have been pert'orn'ied and the segment has been brought to its first disengaging position with the recess 310 in position to be en gaged by the dog SOO, the hand lever 29() will be turned to throw the dog into engagement with the recess, and .at the saine time to drop the rack out oi engagement with the segment. This will turn the positioning device 5l into operative position (but not itar enough to latch it in such operative position). Then the rack will be run back until the collar 380 thereon strikes the nose G1 ol: the positioning device, and through it pushes on the rod 390 so as to thereby stop the retracting movement of the rack, as described in said patent. During this operation the chain may be said to be in its lengthcned position because thel chain lever 62 is tipped to the lett. The lever 290 will now be swung' to the lett in the position shown in full lines, thereby re-engaging the rack, and the second step o't bending,r vis carried on as betere by successive increments until the second step ot bending` is completed, whereupon the recess 870 of the bentler segment will be engaged by the dog 300, the rack will be dropped to disengagement .troni the segment, the positioning device will be lifted to operative position. and the rack will be run back as before. rllhe third step ot the bending operation will now be performed, progressing by successive incremental bendings in which the segment advanccs to the position shown in full lines, the lug 244- will have struck the tail o't1 the chain lever 62 and exerted a pull upon the chain `which will litt the positioning device 5l to a certain extent, but upon each retracting stroke of the bender segment the positioning` device 5l will turn back to inoperative position because the clamping wedge 50 will not be released until the last increment ofthe bend being given the Harige is completed, and then, before retracting the bender, the clamping wedge 50 will be released and this will turn the positioning device up to its operative position and lock it in such position. The rack will now be run back while it is still engaged with the segment until the collar 380 strikes the nose 6l of the'positioning device .51, whereupon the rack will be disengaged, run forward, and re-engaged, the positioning device standing fast the while. The rack will now be re-engaged and run back, bringing the recess 310 opposite the dog 300 (the positioning device standing fast in operative position) until the collar 380 strikes the nose 6l oi the positioning' device. The rack will then be disengaged, run forward, and re-engaged and retracted, and during its retracting movement, or at Ithe end of its retracting movement, the operative will disengage the positioning' device from the-latch pin 56 by pushing on the handle 59 to comp-ress the spring .55, and then the rack may be run back the remainder of the distance to its initial position. Upon the release of the positioning ydevice b-y the use of the handle, which may be operated by the hand or by the foot, the torsion of the spring will turn the positioning device to inoperative position.

It will thus be seen that the machine operates automatically to regulate the position of the bender face, so as to permitthe feeding of the work to the machine during the successive steps o bending the flange down, whereupon the releasing of the clamping wedge at the end of the flange bending operation raises the positioning device into locked operative position where it remains during the resetting actuation of the machine to bring the bender segment back to within a small angle of its initial position, whereas, in the machine of said patent the positioning device was required to be operated by a separate operation of the hand at the end of the langing operation to throw the pawl 500 into operative position. In the present machine the corresponding member, namely the positioning device, is thrown into operative position at the end of the :Flange bending operation by the operation of releasing the clamping wedge. It will be observed that there are two men required to operate the machine, the one being a helper to present the work to the machine, and the other the operator proper, who works the controls for the machine. The latter stands with the right hand on the valve 280 for controlling the oscillations of the bender and with the left hand on the valve 110 for controlling the clamping wedge 50. The present construction enables the operator to throw the positioning device into locked operative position by the wedge valve instead of reaching down and turning it up by an inconvenient hand operation.

Having thus described the invention, what is claimed is l. A flanging machine of the step langing type having, in combination, an oscillating bender, bender actuating means, a work clamp, clamp actuating means, a clamp controller for controlling the movements of clamp actuating means to clamp the work, a positioning device for positioning the arc of oscillation of the bender, and means connected with the clamp actuating means for operating the positioning device.

2. A, Hanging machine of the step flanging type having, in combination, an oscillating bender, bender actuating means, a work clamp, clamp actuating means, a positioning device for positioning the are of oscillation oi" the bender, and means connected with the clamp actuating means for operating the positioning device.

8. A flanging machine of the step Hangingtype having, in combination, a bender, bender actuating means, a work clamp, clamp actuating means, a positioning device for the bender, and means connected with the work clamp and bender actuating means for operating the positioning device.

4E. A flanging machine having, in combination, a bender, bender actuating means, a work clamp, clamp actuating means, a positioning device for the bender, and means controlled by the position of the bender for operating the positioning device.

HUGH MCCABE.

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