US2261793A - Metal working machine - Google Patents

Description

R. w. BRooMHAM METAL WORKING MACHINE Nov. 4, 1941.

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www5. Y ATTORN 5 Nov. 4, 1941. R. w. BRoo'MHAM METAL WORKING MACHINE Filed June 2e, 1939 3 sheetssheet 2 INVENTOR. BY chard-.Qlroomham ATTORN .5.

Nov. 4, 1941. R, W, BQOMHAM .y 2,261,793

METAL WORKING MACHINE Filed June 26, '1939 :s sheets-sheet s' u a? C\ 2 /9/71793Zg//2 n 2/ 2525 INVENTOR.

Patented Nov. 4., 1941 METAL WORKING MACHINE Richard W. Broomham, Detroit, Mich., assigno-r to Motor Products Corporation, Detroit, Mich., a corporation of New York Application June 26, 1939, Serial No. 281,247

12 Claims.

This invention relates generally to metal working machines and refers more particularly to improvements in apparatus for bending a strip of stock to a predetermined longitudinal contour.

It is one of the principal objects of this invention to provide a bending machine of the general type set forth with means for fashioning openings in the strip of stock at preselected points during the interval the strip is bent to the desired longitudinal contour and to accomplish this result Without interfering or delaying the bending operation. As a consequence, handling of the strip of stock is reduced to the minimum and the time interval required to completely fashion the strip, as well as the cost of manufacture of the strip, is correspondingly reduced.

Another advantageous feature of the present invention resides in the relatively simple apparatus provided for accomplishing both the bending of the strip and the formation of openings through the strip. This apparatus, as well as the` foregoing and other objects, will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings, wherein:

Figure 1 is a plan view of the bending machine constructed in accordance with this invention;

Figure 2 is a side elevational View of the machine shown in Figure l with certain parts broken away for the sake of clearness;

Figure 3 is an enlarged fragmentary sectional view taken substantially on the plane indicated by the line 3 3 of Figure 1;

Figure 4 is a plan view of a portion of the machine shown in Figure 3;

Figure 5 is an elevational view of a garnish molding frame capable of being fashioned by the machine forming the subject matter of this in-` vention;

Figure 6 is a cross sectional view taken substantially on the plane indicatedby the line 6 6 of Figure 5.

For the purpose of illustration, I have shown a machine particularly adapted to fashion closed garnish molding frames of the type commonly used as finishing strips for the Window openings of motor vehicle bodies. However, it Will be understood, as this description proceeds, that my improved machine is not limited to forming stock to any particular shape where it is desired to fashion a longitudinally contoured strip with openings through portions thereof.

It is customary to vsecure garnish molding frames to the body structure surrounding the Window openings by fastener elements having shank portions extending through openings formed in the garnish molding frame at preselected points. As briefly outlined above, the present invention concerns itself with fashioning the openings in the garnish molding frame during the interval the latter is bent to the predetermined longitudinal contour. In the present instance, the openings through the garnish molding frame are fashioned by suitable punching fixtures and, in the interest of simplicity, I have shown these fixtures as embodied in the bending machine of the type illustrated in the Axel Edwin Henricson copending application Serial No. 174,716, filed November 15, 1937 (Patent 2,217,053, granted Oct. 8, 1940), although, of course, it will be understood that the punching fixture is not restricted for use in combination with this specific machine.

While the above identified application embodies a specific description of the bending machine se.-

lected herein for the purpose of illustrating the present invention, nevertheless, a brief descripf tion of this machine is given herein. In general, a strip of metal prefashioned to the desired cross sectional contour is cut to the length required to form a garnish molding A of the size and cross sectional area shown in Figures 5 and 6. One end of the straight strip of metal is then assembled with a bending shoe B before the latter is installed in the machine. Upon reference to Figure 3 of the drawings, it will be noted that the cross sectional contour of the shoe corregarnish molding frame A and supported opposite,v

the shoe B on a carriage G. In Figure 2 of the drawings, the perimeter of the templet frameV F is shown as having a continuous recess L therein, and this recess is illustrated as having a cross sectional area which corresponds accurately to the cross sectional contour` of the strip to be fashioned. In other words, the recess L in the perimeter of the templet frame F cooperates l with the shoe B to form a cavity having across the walls of the strip will be effectively supported and main-tained to their original shape during the bending operation.

The form or templet frame F is movable relative to the shoe B throughout a continuous path of travel determined bythe outline of the garnish molding frame A, and the free end of the strip of stock adjacent the shoe is secured to the templet frame by means of a clamp M so as to move as a unit with the templet frame. The air cylinder E functions to yieldably maintain the shoe B into clamping engagement with the stock throughout movement of the templet frame, and this clamping engagement is maintained irrespective of the irregular shape of the templet frame.

The carriage G, supporting the templet frame F, is in the form of a frame corresponding in shape to the shape of the templet frame and is secured to the underside of the latter to provide a unitary construction. In the present instance, the carriage is operated to move the templet frame throughout the path of travel aforesaid thereof by means of an endless chain I-I secured to the perimeter ofthe carriage frame G and meshing with a driven sprocket wheel I. The sprocket wheel I is driven at a reduced speed by means of the power unit O and the chain H is held in intermeshing relationship with the sprocket by means of a roller J In Figure 3 of the drawings, the sprocket wheel I is shown as positioned directly beneath the shoe B arid the roller J is supported on the machine frame opposite the sprocket wheel and shoe B, with the result that the reaction of the force applied by the shoe B against the templet frame F is taken by therolle'r J. It will also be observed from Figure 3 that the roller J engages in a continuous channel K formed in the inner surface of the carriage f'ra'me G and is adjusted relative to the latter by means of the screw P. It follows from the ab'ove'that rotation of the sprocket I by the power mechanism O effects a movement of the templet fra'in'e Fand the strip of stock A throughout a 'continuous path of travel relative to the shoe B to form the strip of stock A to theY contour 'of the garnish molding vframe shown in Figure 5.

It has previously been stated that the pres'- ent invention contemplates forming openings I in the garnish molding frame A during the ihterval the strip of stock is bent to form 'th'e frame. In detail, a plurality of punching iiXtures I2, corresponding in number to the number of openings it is desired to form in the garnish molding frame, are secured to the templet frame F in spaced relation to each other. The number and particular spacing of 'the punching iitures I2, of course, depends upon the number of v'openings I0 and the spacing of these openings desired in the Agarnish molding irai'ne. However, each of the several punching fixtures is prefe'rablyidentical in construction and, therefore, only'one will be described in 'detail herein. As shown in Figure 3, each oi the punching iixtures is provided with a body portion I3 having a substantially nat vertical face 'I4 adapted to abut the inner vertical surface of the templet frame F and hav-V ing a portion projecting above the top surface'of the templet frame F. Projecting :forwardly 'from the upper end of the body YI 3 in overlapping 'rel`a`' tionship with the top surface of the templet'frame F 'is "a, cam guide VI5 0secured to the body le *and having 'a recess I6 cooperating with the 'adjacent portion of the V`top surface of the templet frame F to form a guide for -a cam I1. VUpon reference to Figure 4, it will be noted that the outer end of the cam II projects beyond the adjacent end of the guide and is tapered to provide a cam face I8 for engagement with a projection I9 on the slide D to effect inward movement ofthe cam II transversely of the templet frame F.

The inner end of the cam II is tapered in a downward direction and is engaged by the spherical upper end portion 2I of a vertically eX- tending rockarm 22. The spherical en-d portion 2I of the rockarm is held into engagement with the tapered inner end 20 of the cam by means of a spring pressed plunger 23 supported for sliding movement in a bore 24 formed in the body portion I3. The axis of the bore 24 is inclined in an upward direction and the inner end of the plunger 23 is provided with a spherically shaped recess adapted to receive the adjacent portion of the spherical end 2| of the rockarm 22.

As indicated above, the plunger 23 is urged into engagement with the spherical upper end 2I of the rockarm 22 b'y means of a spring 25 surrounding a reduced portion 26 of the plunger within the bore 24 and having the opposite ends respectively engaging the inner end of the enlarged portion of the plunger 23 and a shoulder 27 provided on the body portion I3. The extent of movement of the plunger 23 in an outward direction by the spring is limited by means of an adjustable stop 28 threaded on the inner end of the reduced portion 26 of the plunger and adapted to abut the adjacent face of the body I3. The adjustable Stop 28 not only limits the extent of movement of the plunger 23 under the action of the spring J25 but, in addition, serves to secure the plunger 23 assembled relation with the bOdy I3. In this ClCiOl, it Will be noted that the cam II is prevented from displacement with reference to the recess I6 by means of a pin 29 depending from the upper wall of the guide 'and projecting into an elongated slot 30 formed in the top surface of the cam.

The rockarm 22 is shown in Figure 3 as ex- ,tending downwardly into 'a vertical bore 3I Vwith an enlargement 32 intermediate the `ends formed in the templet frame F and is provided approxir'nating the 'diameter of the bore and shaped to cooperate with the adjacent surface of the bore to permitro'cking movement of the arm. The lower end of the arm 22 engages within arecess 33 formed in the 'upper side of a punch 34 which, in turn, is slidably mounted in a bore 35 formed in the templet frame F. The bore 35 extends through the templet frame F with the outer end intersecting the ba'se of the contoured recess L formed in the perimeter of the templet frarne F and the axis of the bore is inclined so that the punch 34 moves substantially perpendicular to the surface of the strip A occupying the recess L opposite 'the outer end of the bore 35. The outer end of the punch 3l is reduced 'and is adapted to form the opening I0 in the portion of the strip A supported by the shoe B.

'Operation Assuming that a strip of stock-hasbeen clamped to the templet frame F and that the latter 'is in motion relative tothe shoe AIE5 to eect the bending operation, it will Abe noted that as one 'of Ythe relative tothe shoe causes the cain I1 to move 4'in an inward direction to effect va corresponding with the strip and forms the opening l therein,

It may be pointed out at this time that the projection I9 on the slide D is located in substantially the same plane as the fulcrum 40 on the slide 'for the shoe B so that the reaction of the punching operation istaken directly by the fulcrum 40 and there is no danger of displacing the shoe. Inasmuch as the shoe is stationary relative to the templet frame F, it will be noted that the shoe is provided with an elongated slot 4l in the. surface thereof so as to permit unobstructed travel ofthe templet frame during the time interval required for the punch to return to its initial inoperative position subsequent to the punching operation. As shown in Figure 3, the spring acts to immediately return the punch to its inoperative position as soon as the cam face IB has been advanced beyond the projection From the foregoing, it will be noted that the punch fixtures are operated successively by the projection I9 on the slide D to form the openings I0 in the garnish molding frame and since the strip A to be bent, as well as the punching fixtures, are movable relative to the shoe B as a unit with the templet frame F, it follows that 'the punching operations are eiected at the same time that the strip is bent without delaying or interrupting the bending operation.

What I claim as my invention is:

1. In a machine for bending a strip of stock to form a closed frame of predetermined longitudinal contour, a templet frame having a continuous marginal edge corresponding in shape to the longitudinal contour, means for securingl one end portion of a strip of stock to the marginal edge portion of the templet frame, a bending member supported opposite the templet frame and normally urged into engagement with the strip of stock to clamp the latter against the marginal edge of the templet frame, means for moving the templet frame relative to the bending member f throughout a path of travel determined to form the strip of stock to the contour of the marginal edge of the templet frame, a punching iixture carried by the templet frame and having a punch movable transversely of the frame toward and away from the stock, and means responsive to movement of the templet frame to position the punching xture opposite the bending member to move said punch in a direction toward the strip of stock and punch the portion of the strip located between the bending member and templet frame.

2. In a machine for bending a strip of stock to form a closed frame of predetermined longitudinal contour, a templet frame having a continuous marginal edge corresponding in shape to the longitudinal contour, means for securing one end portion of a strip of stock to the marginal edge portion of the templet frame, a bending member supported opposite the templet frame and normally urged into engagement with the strip of stock to clamp the latter against the marginal edge of the templet frame, means for moving the templet frame relative to the bending member throughout a path of travel determined to form the strip of stock to the contour of the marginal edge of the templet frame, a plurality of. punching fixtures secured to the templet frame in spaced relation to each other and each fixture having a punch movable transversely of the templet frame toward and away from' the strip of stock, and means responsive to movement of the templet frame to successively position the punching iixtures opposite the bending memberto move the punches in directions toward the strip of stock and punch the portion of the strip located between the templet frame and bending member.

3. In a'bending machine, a form having a contoured face for engagement with a strip of stock to be bent, a punch slidably supported on the form for movement transversely of the contoured face to fashion an opening in the strip of stock, an arm rockably supported on the form with one end engaging the punch', yieldabile means acting upon the opposite end of the arm normally urging the punch in a direction away from the contoured face of the form, and a cam member engageable with said arm to rock the latter against the action of the yieldable means in a direction to move the punch into engagement with the strip of stock on the contoured face of the form.

4'. In a bending machine, a pair of members cooperating with each other to grip a strip of stock therebetween, one of the members having a contoured face and movable relative to the other of the members, means for clamping the strip of stock to the contoured face of the Inovable member whereby the strip moves with the movable member and is bent to the contour of the face by the cooperation of the other member with said movable member, a punch carried by the movable member for sliding movement transversely of the contoured face to form an opening through the strip of stock, a rockarm carried by the movable member with one end operatively connected to the punch, yieldable means engaging one side of the opposite end of the rockarm normally urging the latter in a, direction to Withdraw the punch` from the contoured face of the movable member, a slidably mounted cam member engagingthe opposite side of the last named end of the rockarm, and means responsive to movement of the movable member to position the punch opposite the other of said members to actuate the cam and effect rocking movement of the rockarm against the action of the yieldable means to force the punch in a direction toward said other member into engagement with the portion of the strip of stock between saidmembers.

5. In a bending machine, a pair of members cooperating with each other to grip a strip of stock therebetween, one of the members having a contoured face and movable relative to the other of the members, means for clamping the strip of stock to the contoured face of the movable member whereby said strip moves with the movable member and is bent to the contour of said face by the cooperation of the other member with said movable member, a punch carried by the movable member at one side of the stock and movable relative to the latter member toward and away from the stock, and means fixed against movement with said movable member on the opposite side of the stock and responsive to movement of the punch past the same to effect a movement of the punch toward the stoc to punch the latter.

6. In a machine for bending a strip of stock to form a substantially closed frame having a predetermined longitudinal contour, a carriage in the form of a closed frame having inner and outer surfaces corresponding to said predetermined longitudinal contour, a continuous chain extending around one of the surfaces aforesaid of the carriage frame and secured to the carriage, a sprocket engageable with the chain, means for rotating the sprocket to effect movement of the carriage frame throughout a path of travel determined by the contour of the chain, a templet frame having an outer surface corresponding in shape to the longitudinal contour aforesaid and movable b-y the carriage frame throughout a corresponding path of travel, means positioned opposite the templet frame and cooperating with the latter to bend a strip of stock around the surface of the templet frame, a punch carried by the templet frame and movable relative thereto toward and away from the stock, and means for operating the punch during 'the bending operation to punch the stock.

7. In a bending machine, -a pair of :members cooperating with each other to ygrip a strip of stock therebetween, one of the members having a contoured surface and movable relative 'to the other of said members, means "for clamping 'the strip of stock to the contoured surface of Athe movable member whereby the strip moves with 3 the movable member and is bent to the contour of said face by the cooperation of the other member with said movable member, a plurality of punches carried by the movable member at spaced points for movement transversely of the contoured face of the movable member toward and away from the strip of stock, and means for successively moving the punches in directions toward the strip of stock during the bending operation to punch said stock.

8. In a machine for bending a strip of stock to form a frame of predetermined longitudinal contour, a marginal edge portion corresponding in shape to the longitudinal contour, a bending member supported opposite 'the contoured surface of the form and cooperating with the latter to grip a strip of stock therebetween, means for relatively rotating the form and bending member throughout a path of travel determined to form the strip of stock to the contour of the marginal edge of the form, a punch movable relative to the form and member transversely of the strip of stock, and means operable during the bending operation and responsive to relative rotation of the form and bending member to move the punch toward the strip of stock to punch the latter. l

9. In a vbending machine, a form supported for rotative movement and having a contoured surface, means 'for clamping a strip of stock to the contoured surface of said form whereby said strip moves 'with the movable member, a Abending member cooperating with the 'form to bend the strip Aof stock to the contour of the surface aforesaid of the form, a punch carried by the form fat one side of the strip of stock and movable relative to the form into and out of engagement with the stock, means for moving the punch in :a direction toward the strip of stock to punch lthe latter as said punch is moved by the 'fo'rm past the bending member, said bending member having a slot therein for receiving the free end of the punch 'and said slot being elongated in ythe direction of movement of the punch bythe form to permit punching the stock during the bending operation.

l0. In a bending machne,` a pair of members cooperating With each other 'to clamp a 'strip of stock therebetween, one of the members having a 'contoured face and movable relative to the other of said members, means for clamping the strip of stock to 'the contoured face of the movable member whereby said strip moves with the movable member and is bent to the contour 'of the `face by :thecooperation of the other member with said movable member, a punch carried `by the movable member and supported at one side of the stock for movement relative to the movable member into engagement with the stock, and means for moving said punch relative to 'the movable member during th bending operation to punch Athe strip of stock.

l1. vIn a bending machine, a form supported for movement and lraving a contoured face, means for Vclamping a strip of stock Vto ybe bent against the contoured face of the form, a bending member xed against movement with the form and cooperating vwith the contoured face of said form `to bend the strip of stock to the contour of lsaid face,' a plurality of punches mounted on `the form in spaced relation to each other for movement relative to said form into and out of engagement with the stock, and means for successively operating said punches as 'the latt'erare moved Aby the form to positions opposite the bending member to punch the stock located between the form and bending member. l2. In a'bending machine, a pair of relatively movable members cooperating with each other to clamp a strip oi stock vtherebetween and one of said members having a contoured face, means for relatively moving the members to "bend the strip of stock t'o the contour of said face, a punch carried by one -of the members and movable relative thereto transversely of the strip of stock, and means-operating during the bending operation for moving said punch into and out of engagement with the stock to punch the latter.

RICHARD W. BROOM-IAM.

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