US2190839A - Bending brake - Google Patents

Description

Feb. 20, 1940. J. JENSEN ,8

SENDING BRAKE Filed June 21, 1937 3 Sheets-Sheet 1 m (/0/7/7 (ye/732M Patented Feb. 20, 1940 UNITED STATES PATENT FFME 2,190,839 BENDING BRAKE John Jensen, Rockford, Ill., assignor to Whitney Metal Tool Company, Rockford, 111., a corporation of Illinois Application June 21, 1937, Serial No. 149,415

Claims.

ment thereof to accommodate it for various types of bending operations.

Another object is to provide a brake of the character described which is rugged in construction and effective in operation although economical to manufacture.

Novelty also resides in the improved form of pivotal mounting, connection for the platen of the brake. l

Further objects and advantages of the invention will becomeapparent as the following description proceeds and the features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this specification.

For a better understanding of the invention, reference may be had to the accompanying drawings in which Figure 1 is a perspective view of a bending brake embodying the invention.

Fig, 2 is an enlarged partial end elevation of the brake shown in Fig. 1, said parts being sectioned along the line 2-2. i

Fig. 3 is a fragmentary sectional view along the line 3-3 in Fig. 1, illustrating particularly the position of the platen with auxiliary bending fingers attached thereto.

Fig. 4 is a fragmentary detail view, in the direction of the arrows 44 in Fig. 2, of the adjustment locking means for the platen.

Fig. 5 is an enlarged detail View in section along the line 5-4 in Fig. 2, illustrating particularly the construction of the pivotal mountin arrangement for the platen. 46 Fig. 6 is an end elevation of a bending brake provided with a modified form of adjustable mounting for the platen embodying the invention.

The invention in the embodiment selected for purposes of illustration in Figs. 1 to 5, inclusive,

framework formed of generally rectangular end frames i0, and carrying a horizontal bed H thereon, a platen l2 movable toward and away from the bed to clamp a sheet of metal therebetween and a pivotally mounted apron l3 proved construction which simplifies the adjustincludes as its principal elements a supporting adapted to be swung upwardly to bend the) clamped sheet of metal about theforward edge of the platen. Movement of the platen l2 toward and away from the bed H is effected by lever mechanisms M located at opposite ends of the brake.

It will be noted that the platen I2 is provided withacontinuous forward bending edge formed by a wear plate I5 which is utilized in bending plane sheets of metal. In order to condition the brake for bending box forms and the like,

a plurality of detachable fingers l6 (Fig. 3) may be secured thereto at suitable intervals. The brakes illustrated herein embody an improved form of mountingfor the platen by means. of which it may be supported at the requisite height above the bed to accommodate the bending fingers.

.In the particular construction illustrated in Figs. 1 to 5, inclusive, the end frames Ii! are formed from portions of angle iron having a T-shaped cross section. Thus, the horizontal top member of each frame includes a vertically extending central web I! and inwardly and outwardly extending horizontal flanges 18 and I9 (Fig. 5).. The opposite ends of the bed H are supported on these end frames, the bed structure including a horizontal plate 20 (Fig. 3) with its opposite ends overlying the top flanges of the end frames and a vertical front plate 2! overlying the. upper front portions of the-end frames. The forward edge of the top bed plate 20 is reenforced bya web 2?. and a replaceable wear plate 23 is preferably positioned at the forward edge of the top bed plate 2!]. r l

Brackets designated generally by the numeral 2 1 are positioned at the opposite ends of the brake and form a part of the supporting structure for the platen 12. These brackets are illustrated in the form of castings having forwardly ex tending angularly disposed arms 25 and 26 (Fig. 2) the upper. arm 25 being fashioned with an inwardly projecting flange 21 which overlies the off and the set screws 29 adjusted for the desired shifting of the brackets 24. The bolts 28 are then tightened again to hold the brackets in their adjusted positions. ing of the slackened bolts 28, which takes place The resultant shiftduring the adjustment shifting of the brackets for supporting the pivot pins in such manner as to facilitate the adjustment of the pivot points as well as to insure free movement of the platen irrespective of endwise tilting; thereof. This at"- rangement includes in general the utilization of bifurcated supporting yokes 32 defining'upward ly' extending openended guideways 33.. The squared ends of the pivot. pins 36 are arranged for free verticalsliding. movement in these guideways. Consequentlyin View of-the double guideway'suppor t at each end and free sliding movement of the pivots, there will be no binding in the pivotal connection-even though. the platen. I2 may be tilted; slightly in. the course of its operation. The bracket yokes 32 are in turn mounted in laterally projecting U-shaped yokes 34 formed onthe outer Sides of the end brackets.- 24 and. a pair ofscrews 35 (Fig; 2): serveto. adjustthe-posit-ion of the yokes. 32; transversely of the. bed so that the forward edge oi thev platen may be broughtinto exact registry with. theforward edge ofthe bed. Bolts 35. passing throughslots in the. bottoms of. the yokes 34. serve to hold the brackets 32 in their adjusted position. Furthermore. vertical adjustment of. the pivot. pins in may be had. by adjusting, screws 31 threaded in their outerends andbearing against the bottoms of; the, guideways. 33. It will thus be seen that the position of the pivotal. axis for the platen i2 may be. adjustedbcth horizontally. and vertically withgreat nicetyr In addition, an. arrangement has been provided for adjusting the height of the platen. 12 above the bed! i. As was previously noted, this adjustment is particularly usefulwhen' auxiliary bending fingers such as. the fingers it are attached to the platen forbox bending operation. This arrangement includes in general an adjustable pin and slot connection between the ends of the platen and. the links 39. Two parallel" slots 38 (Fig. 2) are formed in each of the links 30, these slots beinginclined with respect to the bottom of. the platen. Laterally projecting pins 39 arranged at the forward and rear ends of the bottom of the platen are inserted in the slots 38. For si'mplicity'and ruggedness of construction, these pins are. preferably welded in position at the lower. corners of the triangular box-like platen structure (Fig. 3). It will thus be seen that, as thepinsts are slid alongthe slots 38', the platen I'Z will be moved not only upwardly but also rearwardly. I The platen is locked in its-adjusted position. on the brackets 30 by means of nuts 40 threadedon the pins 39 andbearing against lock Washers 4i havingitransverse projections 42 (Fig. 4) on their inner faces-which interfit with complementary recesses 43 formed in the guideways rear end portions 45 adapted to fit within a complementary undercut groove 46 in the bottom of the platen. A clamping plate 41 detachably connected to the fingers overlies the front. face of the wear plate 15 and holds the fingers firmly in position.

In the operation of the brake, the platen I2 is manipulated by the linkage mechanisms I4 which include counterweighted upwardly extending opcrating levers 48 (Fig. 2) pivoted on the end brackets 24 at 42L The lower ends of the operating arms 48 are U-shaped and receive the lower ends of linksfiii which are pivoted thereto at'5l, pivots 49 and 5! being eccentrically disposed, thereby constituting a toggle linkage. The upper ends of the links 50.. are pivotally connected. at 52 to the. forward ends of the. links 30. It will be noted that the links 59 are composed of alined pins. threaded in a central sleeve 5|] which serves to adjust their effective. length. As the operating levers 43 are swung in a clockwise direction (as viewed in Fig. 2) the platen I2 is also movedin a-clockwise direction about its pivots 3i. Counterclockwise or forward movement of the arms A8 is limited. by adjustable stop screws 48 (Fig. 2) threaded in suitable bosses on the brackets 2.4 and contacting the lower ends of the linkage arms 48.

, The apron l3, hingedly connected to the bed and operable to bend the sheet of metal secured between the bed and platen, consists in general of a normally depending leaf 53 supported with its upper rear edge substantially coincident with the upper front edge of the bed wear plate 23. At each end of the leaf 53 is bolted a hinge strap 5'4 enlarged andforked at its upperend'to receive a stud 55 projecting from the bracket 24. The strap 54' is attached to the-stud by a pin project'- ing through the stud and forked end of the strap.

As best shown in Fig. 3, the hinge axis of the apron coincides with the front corner of the bed wear'pl'ate 2-3" so that the upper edge of the leaf 53, which aifects the bending, will remain the same'distance from the corner of the wear plate 23 as the apron is swung about its axis. Swinging movement is imparted to the apron by depending" bars or manual operating handles 56 (Fig. 1) and suitable 'counterweights 51 carried byupwardly projecting arms 58 are preferably providedtherein;

In perfonningi some bending. operations it is desirable that the apronb'e swung only a part of the Way toward the platen l2? so as to bend the sheet at some predetermined" angle. In order to facilitate this type of bending, rods 59' (Fig. 2) are pivoted to the lower ends of the apron straps 5'5; these rods being freely slidable in apertured rotatable pins'tfi on the brackets 2'4. Adjustable stops 6! threaded on the rods 59 contact the pins Giito limit upward movement of the apron at any'sel'ected point.

l'nthe operation of the bending brake described above, theinitial'adjustment of the upper apron edge with respect to the bed i's'had by adjusting the set screws it to shift the end brackets 24' either transversely Or vertically after having slacked ofi the bolts 28. When the set screws 29 have been set for the desired clearance between the bracket 24" and the end frame, the bracket is-secured firmly in such position by the bolts 28.

Similarly, the initial adjustment of the bending edge of theplaten with respect to the forward edge of the bed is effected by changing the points of pivotal mounting of the platen through the medium of adjusting screws 35 and 31. platen I2 is then raised by the operating levers 48 and a sheet of metal clamped between the platen andbed, whereupon the apron is swung upplaten may. again be adjusted by the screws 35 and 31. The bending operations are then performed in the usual manner.

The bending brake illustrated in Fig. 6 is, in general, similar in constructionfto that heretofore described but is somewhat lighter in con- .struction and is particularly adapted for use with lighter gauge sheets of metal. This brake ineludes and members Ill formed of angle iron and supporting the opposite ends of a bed plate I! having a generally L-shaped cross section with a wear plate 23 inset in its forward edge. A platen If identicalin construction with the platen l2, described above, is supported for swinging movement toward and away from the bed and links 38* pivoted at their rear ends in. brackets 52. A suitable toggle linkage it substantially identical with that described above, is utilized for moving platen intoiand out of clampingposition. An apron not shown) is hinged on the forward ends of the brackets H by pins 53 and may be swung toward away from the platen to bend a clamped sheet of metal inthe usual manner.

The br shown 6 differs from that iilustrat in Figs. 1 to 5, inclusive, principally in that simplified adjustable connection has been provided for securing the platen w to its associated supporting links 36 In this construction, parallel inclined slots 64 are formed in the links (it The upper ends of these slots are undercuter recessed, as indicated at .55, so thatlatorally projecting 39 secured to the ends of a platen and inserted inthe slots 64 will drop into the when moved to the upper ends of the slots. Consequently, ordinary washers 6B and nuts 61 threaded on the pins 39 may be utilized to clamp the platen 62? either in its lowered position shown infull lines in Fig. 6 or in its raised position shown in dot-dash lines. When in the raised position indicated, auxiliary bending fingers maybe attached to the platen in the same manner as described above.

Although certain particular embodiments of the invention have been shown and described in some detail for purposes of illustration, there is no intention to thereby limit the invention to suohpreferred embodiments but, on the other the appended claims are intended to cover all modifications within the spirit and scope o l the invention. i I claim as my invention:

l 1. ,A bending brake comprising, in combination,

a supporting framework, a bed carried by said framework, a platen arranged above said bed for swinging movement toward and away from the same, said platen presenting a continuous bendingedge for the bending of plain sheets, auxiliarybending fingers adapted to be detachably a selected height above said bed and displaced a.

corresponding distance rearwardly thereof, whereby said platen may be. readily positioned with either said continuous bending edge or said auxiliary fingers in operative relation with said bed.

2. A bending brake comprising, in combination, a supporting framework, a bed carried by said framework, a platen arranged above said bed for swinging movement toward and away from. the same, links pivotally mounted on said framework, adjacent the opposite ends of said platen, each of said links having a slot therein inclined with respect to the plane of the lower side of said platen, means supporting said links with the slotted portionsthereof above said bed,

. and means including projections on said platen insertedlin said slots for adjustably supporting said platen on said links at a selected height above said bed. l

3. A bending brake comprising, in combination, a supporting framework, a bed carried by said framework, a platen disposed above said bed for swinging movement toward and away from the same, said platen being of box-like construction and generally triangular incross section, links pivotally mounted on said framework adjacent the opposite ends of said platen, each of said links having a pair of parallel slots formed therein inclined with respect to the plane of the lower side of said platen, means supporting said links with the slotted portions thereof above said bed, andmeans including laterally projecting pins secured in the lower corners of each triangularend of said platen and inserted in said slots foradjustably supporting said platen on said links at a selected height above said bed.

4. A bending brake comprising, in combination, a supporting framework, a bed carried by said framework, a platen disposed above said bed and arranged for swinging movement toward and away from the same, links pivotally mounted on said framework adjacent the opposite ends of said platen, each of said links having a slot therein inclined with respect to the plane of the lower side of said platen, means supporting said links with the slotted portions thereof above said bed, projections on oppositeends of said platen inserted in said slots and adapted .to support said platen closely adjacent said bed when disposed in the lower endsof said slots, and means including lock washers on said projections having teeth thereon adapted to coact with complementary recesses adjacent the upper ends of said slots for detachably maintaining said platen in an elevated position with respect to said bed.

in inclined with respect to the plane ofthelower side of said platen, means supporting; said links with the slotted portions thereof above said bed, and projections on opposite ends ofsaid platen inserted in said slots and adapted. to support said platen closely adjacent said bed when dis posed in the lower ends of said slots, said slots havingdownwardly curved upper end portions adapted to engage said pins to maintain said platen in elevated position with respect to said bed.

6. A bending brake comprising, in combination, a supporting framework, a bed carried by said framework, a platen disposed above said bed and adaptedv to cooperate therewith to clamp a sheet of metal therebetween', bifurcated open ended upwardly facing yokes on said framework adjacent the ends of said platen, pivot pins disposed' in said yokes, and means for journaling said platen on. the intermediate portions of said pins between the sides of said bifurcated yokes. 7. In a bending brake the combination of a bed, a platen located abovexsaid bed, means ineluding a continuous bending edge disposed along the forward portion of said platen for conditioning the same to bend plain sheets, means including a plurality of removable fingers fashioned to I extend downwardly and forwardly from said platen when secured thereto for conditioning said platenfor the bending of boxiorms, means supporting said platen for swinging movement toward and away from said bed, said last named -means including slotted plates disposed at 0-pbring either said continuous bending ed'geor said fingers exactly into the position desired, and a cooperating bending apron swingably mounted on said bed.

8. A bending brake comprising, in combination, a bed and platen adapted to clamp a sheet of metal therebetween, means formingv a continuous bending edge. on said platen for. the bending of plain sheets, fingers adapted to be carried by said platen to providea discontinuous bending edge for the bending of boxes, a platen supporting member, means pivotally' supporting said member for swinging movement or. said platen toward and away from said-bed'for the. clamping of a metalsheet' therebetween,,and means forming an adjustable connection between said member-and said platen independent of said pivotal means for adjusting the position of, said platen above said bed both horizontally and vertically to accommodate saidv fingers.

9; A bending brakecomprising, in combination, a bed and-platen adapted to clamp a sheet of metal therebetween, means forming a continuous bending edge on saidplaten for the bend.- ing of plain sheets, fingers adapted to be carried by said platen to provide a discontinuous bending edge for the bending of boxes, a pivot located adjacent the rear of. the bed, an arm projecting a substantial. distance generally forwardly from 10. A bending; brake comprising, in. combination, a bed and platen adapted to clamp a sheet ofmetal therebetween, means forming a continuous bending edge on said platen for the bending of plain sheets, fingers adapted to be carried by said platen to-providea discontinuous bending edge for the bending of boxes, a pivot located adjacent ,therear; of the bed, an arm projecting a substantial distance generally forwardly from said pivotand swirl-gable about the same toward and away from. said bed, means forming a vertically adjustable connection between said arm and.- platenv and. at av point displaced a substantial distance forwardly from said pivot toward the iront of; the bedv for alternatively supporting said platen either in a position to aline said continuous bending. edge in operative relation with said bed or alternatively at a substantial distance above said bedv and with said fingers in operative relation with said bed, and meansfor adjusting said pivot toward and away from the front of the bed to accomplish an accurate alinement between the bed and the fingers or continuous bending edge.

JOHN JENSEN.

p CERTIFICATE or CORRECTION. Patent No. 2,190,859. 7 February 20, l9LLO.

' JOHN JENSEN.

It is hereby certified that error appears in the printed specification of the above numbered patent. requiring correction as follows: Page 1, second column, line h 9, strike out the words "positions of the" and insert the, same before "brackets" in line 50; page 2, second column, line J 8, for "affects" read effects; line 55, for "therein" read thereon; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 16th day of April, A. D. l9h0.

Leslie Frazer (Seal) Acting Commissioner of Patents.

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