US410112A - Machine foe bending metal baks - Google Patents

Machine foe bending metal baks Download PDF

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US410112A
US410112A US410112DA US410112A US 410112 A US410112 A US 410112A US 410112D A US410112D A US 410112DA US 410112 A US410112 A US 410112A
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block
bar
machine
bending
bending metal
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/06—Removing local distortions

Definitions

  • JMQJGW BY CAM ATTORNEY JMQJGW BY CAM ATTORNEY.
  • WITNESSES .N
  • This invention relates to a machine for bending metal bars, and in the present instance is shown as adapted to make stirrups or timber-hangers such as are usedin the construction of houses and for other purposes.
  • Fig.2 is a cross-section on the line 2 2. Figs.
  • FIG. 3 and 4 are views of the metal bar before thestirrup .is formed.
  • Fig. 5 is a view of a finished stirrup.
  • Fig. 6 is a cross-section of part 3 of the machine on the line 6 6.
  • Fig. 7 is a view of the eccentric-shaft.
  • Fig. 8 is a view of the slide-jaw.
  • Fig. 9 is a side view of the machine.
  • Figs. 10 and 11 are views of the center-bending device.
  • the main iron block A is mounted and centrally pivoted on a base B.
  • a pivot-shaft O connects the block and base, and the arrangement is such that the said main block may tiltdown on either side, thereby elevating one side or the other, as may bedesired.
  • the two opposite sides a of the block are beveled or inclined from the top facet, and each beveled side is provided with one or more crossledges a, cast integral with the block.
  • the cross'ledge is in line with the grip device hereinafter described and serves as a side support for the metal bar while its end is being bent.
  • This main block is provided in its top face I) with one or more grooved slideways d, and each slideway has a movable grip-j awE, which is confined by the side plates 1).
  • the endf of each grooved slideway forms one side of a clamp or grip, of which the end f of the slidejaw E forms the other.
  • a clamp or grip of this kind is at both ends of the slide-jaw.
  • the main block in the present instance has three slide-jawsE, each of a different length from the other. These clamps or grips are to receive the end 9 of the metal bar that is to be bent.
  • Thebar has a twist t, which is imparted to it previous to its receiving any treatment by the machine.
  • the end 9 of the bar is to enter one of the grips ff, as shown in Fig. 2, and is then bent to form the angle j, and again bent down to form the second angle j.
  • This latter angle is formed by bending the bar over the edge 7' of the main block, at which time the crossledge 0 serves as a side supportfor thehanger part c of the bar
  • the edge of the said hanger part c of the bar rests upon the beveled or inclined side a of the block, and thereby the hanger part of the bar has imparted to it-ja corresponding inclination from the hook part.
  • Each slide-jaw E is moved endwise by a square-headed eccentric-shaft F.
  • the lower end is of each eccentric-shaft fits and turns in a bearing Z in the block A, and the upper part end.
  • the slide-jaw E has a rectangular hole loosely occupies this recess and is movable laterally or crosswise of the jaw, but not lengthwise.
  • the eccentric part m of the shaft F occupies a round hole in the -movable block 0.
  • a washer-plate p rests on and covers the block 0 and recess n and keeps iron-scale from entering the recess.
  • crank-arm G is applied to the square head. A quarterturn is sufficient.
  • a weight 0 on the end of the crank-arm G serves to hold it from moving when in the down position. (Shown in Fig. 9.)
  • a hook g which projects -above the top face.
  • the metal bar I as it appears m of said shaft is eccentric with the said lower or recess 02, (see Figs. 6 and 8,) and a block 0- bar, (not shown,) while the other end is held by an attendant.
  • a straight bar with one end under the said hook q will thus serve to confine the heated bar close to the top face I) while the second angle j is beingbent.
  • the two ends of the barI are bent separately, one at a time, the center bends s 3 being made last.
  • the bar has two central bends or angles 3, which are formed by the device shown in Figs. 10 and 11.
  • the plate L has a seat 2%, for the former s, which is secured thereto by bolts u, and thereby the former maybe readily removed to admit another of different size.
  • arigid arm N secured by bolts 0, and each has a gage device P and a set-screw o, whereby the gage is adjustable longitudinally on the arm.
  • the gage P serves as a stop against which the hook part j j at one end of the stirrup abuts, and said stop or gage determines where the bends or angles 3 of the bar will come.
  • Two pivot-holes w are at each side of the plate, and two bending levers Q are employed. Each has a pin 10, which fits in either one or the other of said pivot-holes.
  • the movement of the bending-levers (only one is shown in the drawings) is indicated in Fig. 11 by a curved broken lin e.
  • a presser-clamp R is movable toward and away from the end of the former s by a screw 00, which turns in a fixed nut and hearing y, secured to the plate L.
  • a crank arm or wrench (not shown) must be applied to the square end cc of the screw, in order to turn it.
  • the operation of the center-bender is as follows:
  • the bar I, with both ends bent to form the end hooks, is placed crosswise of the plate L at the end of the former s, so that the gage device P will determine its proper position.
  • the screw x is then turned to bring the presser-clamp R tight against the center of the bar I and hold it fast against the end of the former s.
  • 111 a machine for bending metal bars, the combination of a block A, provided with a grooved slideway and having on its side a cross-ledge c, a gripjaw movable in said slideway, and an eccentric to move said gripjaw.
  • a block A provided with a grooved slideway having stop ends f, which are solid or integral with the block and form one side of a grip
  • a jaw movable in said slideway and constituting the other side of the grip an eccentric whose shaft has a hearing in said block and moves the sliding gripjaw, a crank-arm to turn the eccentric-shaft, and a weight 1" to hold the shaft in position, as set forth.
  • a block A provided with a grooved slideway and having at the corner a hook (1, which projects above the top, and having on its side a cross-ledge c, a grip-jaw movable in said slideway, and an eccentric to move'said grip-jaw.
  • a block A provided with a slide-jaw, each end of which forms one side of a grip, a base, and a pivot connecting the block and base.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Description

(No Model.) 3 Sheets-Sheet 1.,
T. P. KRUG.
MACHINE FOR BENDING METAL BARS.
' I Patented Aug. 27 1889.
1 Eli,
WITNESSES: INVENTOR:
ATTORNEY.
(No Model.) 3 Sheets-Sheet 2.
T. F. KRUG. MACHINE FOR BENDING METAL BARS.
No. 410,112. Patented Aug. 27 1889.
WITNESSES INVENTOR:
tam 5 71 Wmw My ATTORNEY.
' (No Model.) 3 Sheets-Sheet 3.
T. P. KRUG. MAGHINE FOR BENDING METAL BARS.
No. 410,112. r .v Pate%1ted'Aug.Z7 1 889.
INVENTOR:
JMQJGW BY CAM ATTORNEY.
WITNESSES: .N
N PETERS. Pmmmm m. Washington. 0. c.
UNITED STATES THEODORE F. KRUG, OF BALTIMORE,
MARYLAND, ASSIGNOR TO G. KRUG &
SON, OF SAME PLACE.
MACHINE FOR BENDING METAL BARS.
SPECIFICATION forming part of Letters Patent No. 41Q,112, dated August 27, 1889.
Serial No. 305,851. (No model.)
To ctZZ whom it may concern.-
Be it known that I, THEODORE F. KBUG, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Machines for Forming Metal Timber-Hang ers, of which the following is a specifiation.
This invention relates to a machine for bending metal bars, and in the present instance is shown as adapted to make stirrups or timber-hangers such as are usedin the construction of houses and for other purposes.
The invention is illustrated in the accompanying drawings, in which- Figurelisatop view of part of the machine. Fig.2 is a cross-section on the line 2 2. Figs.
3 and 4 are views of the metal bar before thestirrup .is formed. Fig. 5 is a view of a finished stirrup. Fig. 6 is a cross-section of part 3 of the machine on the line 6 6. Fig. 7 is a view of the eccentric-shaft. Fig. 8 is a view of the slide-jaw. Fig. 9 is a side view of the machine. Figs. 10 and 11 are views of the center-bending device. p
The main iron block A is mounted and centrally pivoted on a base B. A pivot-shaft O connects the block and base, and the arrangement is such that the said main block may tiltdown on either side, thereby elevating one side or the other, as may bedesired. The two opposite sides a of the block are beveled or inclined from the top facet, and each beveled side is provided with one or more crossledges a, cast integral with the block. The cross'ledge is in line with the grip device hereinafter described and serves as a side support for the metal bar while its end is being bent. This main block is provided in its top face I) with one or more grooved slideways d, and each slideway has a movable grip-j awE, which is confined by the side plates 1). The endf of each grooved slideway forms one side of a clamp or grip, of which the end f of the slidejaw E forms the other. A clamp or grip of this kind is at both ends of the slide-jaw. As shown in Figs. 1 and 6, the main block in the present instance has three slide-jawsE, each of a different length from the other. These clamps or grips are to receive the end 9 of the metal bar that is to be bent. An
opening or hole It is made through the main before bending, is shown in Fig. 3. Thebar has a twist t, which is imparted to it previous to its receiving any treatment by the machine. The end 9 of the bar is to enter one of the grips ff, as shown in Fig. 2, and is then bent to form the angle j, and again bent down to form the second angle j. This latter angle is formed by bending the bar over the edge 7' of the main block, at which time the crossledge 0 serves as a side supportfor thehanger part c of the bar The edge of the said hanger part c of the bar rests upon the beveled or inclined side a of the block, and thereby the hanger part of the bar has imparted to it-ja corresponding inclination from the hook part. Each slide-jaw E is moved endwise by a square-headed eccentric-shaft F. The lower end is of each eccentric-shaft fits and turns in a bearing Z in the block A, and the upper part end. The slide-jaw E has a rectangular hole loosely occupies this recess and is movable laterally or crosswise of the jaw, but not lengthwise. The eccentric part m of the shaft F occupies a round hole in the -movable block 0.
Itwill be seen that by partly turning the eccentric-shaft the slide-j aw E will be moved endwise in the grooved slideway d, andthereby the grip ff will be closed and opened. It is intended that each end of the slide-jaw E will serve as a gripper.
A washer-plate p rests on and covers the block 0 and recess n and keeps iron-scale from entering the recess.
To turn'the eccentric-shaft F, a crank-arm G is applied to the square head. A quarterturn is sufficient. When the crank-arm is moved from the position shown in Fig. 1 to the down position shown in Fig. 9, which latter is the operative or gripping position, a weight 0 on the end of the crank-arm Gserves to hold it from moving when in the down position. (Shown in Fig. 9.)
At each corner of the main block A is a hook g, which projects -above the top face.
block below each grip and affords escape for the scale that drops from the heated end of the said metal bar. The metal bar I, as it appears m of said shaft is eccentric with the said lower or recess 02, (see Figs. 6 and 8,) and a block 0- bar, (not shown,) while the other end is held by an attendant. A straight bar with one end under the said hook q will thus serve to confine the heated bar close to the top face I) while the second angle j is beingbent. The two ends of the barI are bent separately, one at a time, the center bends s 3 being made last. When the two angles jj are bent on one end of the metal bar I, it is necessary to operate at one side of the main block, and it is more convenient to tilt the block so as to raise one side, and the operating side must be the high side, as shown in Fig. 9. When bending the two angles jj on the other end of the metal bar, it is necessary to tilt the block the opposite way, so as to bring the other side up. It is thus intended to employ the two opposite beveled sides of the block.
This necessity for working on two sides of the block arises from the fact that the twistt' at one end of the barI is in a different direction from the twist at the other end.
The bar has two central bends or angles 3, which are formed by the device shown in Figs. 10 and 11. The plate L has a seat 2%, for the former s, which is secured thereto by bolts u, and thereby the former maybe readily removed to admit another of different size. At each side of the plate is arigid arm N, secured by bolts 0, and each has a gage device P and a set-screw o, whereby the gage is adjustable longitudinally on the arm. The gage P serves as a stop against which the hook part j j at one end of the stirrup abuts, and said stop or gage determines where the bends or angles 3 of the bar will come. Two pivot-holes w are at each side of the plate, and two bending levers Q are employed. Each has a pin 10, which fits in either one or the other of said pivot-holes. The movement of the bending-levers (only one is shown in the drawings) is indicated in Fig. 11 by a curved broken lin e.
A presser-clamp R is movable toward and away from the end of the former s by a screw 00, which turns in a fixed nut and hearing y, secured to the plate L. A crank arm or wrench (not shown) must be applied to the square end cc of the screw, in order to turn it.
The operation of the center-bender is as follows: The bar I, with both ends bent to form the end hooks, is placed crosswise of the plate L at the end of the former s, so that the gage device P will determine its proper position. The screw x is then turned to bring the presser-clamp R tight against the center of the bar I and hold it fast against the end of the former s. The two ends of block loosely occupying said hole or recess,
and a shaft fitted to turn in the main block and having an eccentric end which turns in the said loose block.
2. 111 a machine for bending metal bars, the combination of a block A, provided with a grooved slideway and having on its side a cross-ledge c, a gripjaw movable in said slideway, and an eccentric to move said gripjaw.
3. In a machine for bending metal bars, the combination of a block A, provided with a grooved slideway having stop ends f, which are solid or integral with the block and form one side of a grip, a jaw movable in said slideway and constituting the other side of the grip, an eccentric whose shaft has a hearing in said block and moves the sliding gripjaw, a crank-arm to turn the eccentric-shaft, and a weight 1" to hold the shaft in position, as set forth.
4. In a machine forbending metal bars, the combination of a block A, provided with a grooved slideway and having at the corner a hook (1, which projects above the top, and having on its side a cross-ledge c, a grip-jaw movable in said slideway, and an eccentric to move'said grip-jaw.
5. In a machine for bending metal bars, the combination of a block A, provided with a slide-jaw, each end of which forms one side of a grip, a base, and a pivot connecting the block and base.
6. In a machine for bending metal bars, the combination of a block A, provided with two opposite beveled-or inclined sides, and a slidejaw, each end of which forms one side of a grip.
In testimony whereof I affix my signature in the presence of two witnesses.
THEODORE F. KRUG.
Witnesses:
JNo. T. MADDoX, JOHN E. MORRIS.
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