US1023049A - Machine for making lock-joined angular metal tubing. - Google Patents

Description

J..STANDER. MACHINE FOR MAKING LOOK JOINED ANGULAR METAL TUBING.

APPLICATION FILED APR. 12, 1911.

Patented Apr. 9, 1912.

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MACHINE FOR MAKING LOOK JOINED ANGULAR METAL TUBING.

' APPLICATION FILED APR. 12, 1911.

Patented Apr. 9, 1912 2 SHEETS-SHEET 2.

JACOB STANDER, OF BROOKLYN, NEW YORK.

MACHINE FOR MAKING LOCK-JOINED ANGULAR METAL TUBING.

Specification of Letters Patent.

Patented Apr. 9,1912.

Application filed April 12, 1911. Serial No. 620,559.

To all whom it may concern:

Be it known that I, JACOB STANDER, a citizen of the Empire of Austria-Hungary, and a resident of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Machines for MakingLock-Joined Angular Metal Tubing, of which the following is a specification.

This invention has reference to improvements in a machine for making lock-joined angular metal tubing to be used in orna mental bedsteads which are usually made of brass and iron.

It is the special purpose of this invention to produce a machine for making angular tubing which is of simple construction and although rather wide may be operated by one workman. Means are provided in the machine which render it .adapted for the production of rectangular tubing of square and oblong cross section as well as tubing having other angles. Metallic tubing to be used in the manufacture of bedsteads must be smooth on the outside without any projection 011 the lock-joint. The present machine produces such tubing in a quick reliable and inexpensive manner and care has been taken to produce a strong and compact machine all as will be fully described hereinafter with reference to the accompanying drawings in which:

Figure 1 represents in front elevation a machine for making lock-joined angular metallic tubing which embodies in desirable form the present improvements. Fig. 2 shows this machine in top plan view. Fig. 3 is an end elevation of same. Fig. 4 is a detail section on an enlarged scale on line 4-4 of Fig. 1. Figs. 5, 6, 7 and 8 show metal sheeting prepared for making angular tubing and Fig. 9 illustrates the metal sheeting during various stages of making the tubing. Fig.'10 is an enlarged detail View of the die-mechanism shown in Fig. 4.

Similar characters of reference denote like parts in all the figures. In thedrawing in Fig. 1 a represents upright and parallel substantial frames connected in the upper part 'by a stationary table plate or platen Z2 having strengthening end ribs 0 which are connected tothe side frames a by bolts 0?. A shaft 6 is mounted in the upper portion of the side frames a. This shaft has two c'amportions e one on each outer portion near the side frames a of which cams one is shown in Fig. 4.

Around each cam 6 there is a bearing f leaving sufficient play for the operation of V the cams. These bearings are part of a horizontal substantially fiat topped clamp plate f which thus is suspended thereon and is moved up and down when the shaft 6 is turned a quarter of a revolution by a hand operated lever g secured to said shaft 6. The plate is guided by two studs 7 integral thereon and passing into corresponding circular borings in the table plate I) as shown in Fig. 4. On the front of the plate f there is secured in any suitable manner a plate It forming the tool for clamping the metal sheeting. This plate is preferably of steel. The stationary plate 6 which may be of cast iron may also have along its front edge an extra plate 2' of hardened material, such as steel. Pivoted to the side frames a there is a strong die-carrying plate j which plate 71 is held in place by a plate Z bolted to the plate 7'. A plurality of angle irons m are secured to the plate Z which angle irons carry each an adjustable gage or guide a for determining the distance to which the metal sheeting is to be inserted into the machine. Each guide has a rear projection n against which the metal sheeting rests during the operation of the machine.

In order to ease the work of the operator the weight of certain parts of the machine is counterbalanced. This mechanism comprises essentially two pivots j of the plate j which extend beyond the side frames a and carry each an arm j extending downwardly parallel tothe plate j. The lower portion of each arm y? carries a pin j to which a chain 0 is secured. The chain 0 passes over a loose roller 79 on the shaft 6 and a counterweight g is carried by the second end of the chain 0. The plate j is provided with two hand levers j by means of which it may be levers can not be reached by one workingman at the same time. Therefore the counterweights are provided which in the normal position of the plate j tend to draw the plate j upwardly and rearwardly, see Fig. 3. lVhen the plate j is lifted the chain 0 passes around the roller 79 and the .arm 7' swings to the left in Fig. 3 while the chain passes beyond the center of the pivot j whereby the counterweight balances the weight of the plate j. A scale of openings 1" in one of the side frames is purposed for receiving a pin r to limit the movement of the arms j whereby various tubes with various angles may be produced having for instance angles of 30, 45, 60 and 90 degrees.

From the foregoing description, it will be observed that the practical feature of the invention resides in the employment of a substantially fiat topped clamp plate movable toward the fiat platen and provided at one edge portion with a downwardly projecting clamping rib :0, in rear of which rib the under side of said clamp plate is cut away at g to provide a clearance space to receive the previously bent parts of the blank, in combination with a die plate hinged at the front edge of the bed plate, said die plate having in its upper outer face a longitudinal groove that receives one of the first bent edges when the third bend is being made adjacent that edge.

The operation of the machine is substantially as follows: First, a piece of metal sheeting 8 cut to proper size is inserted into the machine so that its front edge is in line with the front edge of the plate is. Now the hand lever g of the shaft 0 is turned down by the operator whereby the plate f is lowered and the tool plate It thereon presses the metal sheeting .9 down upon the steel plate 2'. The hand levers 7' are then moved upward thereby turning the plate j with all the parts connected thereto until the upper surface of the plate is presses the front portion of the metal sheeting .9 against the upper surface of the narrow front portion of the plate h producing thereby one short acute angular bend on the metal sheeting shown in Fig. 6 and marked 1. The lever g is now swung backward into its normal position shown in Fig. 3 whereby the plates f and h are raised. The sheet 8 may then be withdrawn and inserted again with its opposite end to bend said end portion in the opposite way, shown in Fig. 7 and designated 2. In like manner the sheet 8 is again withdrawn and inserted again but so that the bent portion first inserted stands upward and to make room for said bent portion the plates f and h are cut out as shown in Fig. 4. The other bend is now in the front and rests in the groove 76 of the plate above referred to. The pin 7 which is inserted in one of the openings 1" determines now the angles of the tubes to be made. By

operating now the levers j* the plate j is again swung upward until the arm j rests against the pin 1. Thereby the short bend is made as shown in Fig. 8 and marked 8. The sheet 8 is now placed against the shoulder 11 of the guide n which of course was properly set for the required size of the tube. Upon the operation of the lever g and the levers j one large bend is made for one side of the tubing, as shown in Fig. 9 and marked t. The lever g is then returned and the sheet 8 moved against the shoulder 12 of the guide 12, and the second side turned marked 5 in Fig. 9. This is repeated to bend the third side whereby the tube is completed. During these operations the first bent side slides along the top surface of the plate f keeping the interlocking end portions somewhat apart. Owing to the elasticity of metal sheeting these interlocking parts may be easily joined as soon as the tube is taken out of the machine. The locked short bends l and 2 are then finished in a separate machine.

It will thus be observed that the distinctive feature of this machine resides in its capability of producing, in a single blank of sheet metal, all of the corner bends, as well as the edge bends for the lock joint, of an angular metal tube which is particularly designed for use in the manufacture of metal bedsteads. That is to say, this machine produces, at opposite side edges of the metal blank, the initial edge bends to form the lock joint or seam of the tube, then the returned bend in one side edge for the lock joint or seam, and then the several corner bends in succession to develop the tube form of the article, after which the bends for the lock joint are closed by a separate machine to make the seam and thereby complete the tube.

I claim as my invention:

1. In a metal tube-forming machine, the combination of a flat platen, a clamp plate movable toward the platen and provided at one edge portion with a projecting clamping rib for binding engagement with the metal blank, a die plate having a hinged support at the front edge of the platen, said die plate presenting a flat top surface, normally flush with the platen of the machine, and having at its upper outer face a longitudinal groove that receives one of the first bent edges when the third or return bend is being made in the blank adjacent such edge.

2. In a metal tube forming machine, the combination of a fiat platen, a clamp plate movable toward the platen and provided at one edge portion with a downwardly projecting clamping rib, in the rear of which rib the said clamping plate has its underside cut away to provide a clearance space to receive the previously bent parts of the blank,a die plate having a hinged support at the front edge of the platen, said die plate presenting a flat top surface, normally flush with the platen of the machine and having in its upper outer face a longitudinal angular groove that receives one of the first bent edges when the third or return bend is being made in the blank adjacent such edge, the clamp plate being further provided With a substantially fiat top to permit the blank to overlie the same during the making of the 10 third and next succeeding bends, asset forth. Signed at New York, N. Y., this 11th day of April, 1911.

JACOB STANDER.

WVitnesses CORINNE MYERS, VERA- PAULSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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