US1142493A - Machine for making corner-bead blanks. - Google Patents

Description

N. E. CLARK.

MACHINE FOR MAKING CORNER BE AD BLANKS.

' APPLICATION FILED SEPT. 29, I914- Patented June 8,1915.

3 SHEETS SHEET I.

Fig--31.-

WITNESSES h N. E. CLARK. MACHINE FOR MAKING CORNER BEAD BLANKS.

APPLICATION FILED SEPT- 29, i914- -Patented June 8, 1915.

' 3 SHEE TSSHEET,2-

WITNESSES INVENTOR N. E. CLARK.

MACHINE FOR MAKING CORNER BEAD BLANKS. APPLICATION FILED SEPT. 29, I914.

- 1,142,493. Patented June 8, 1915.

j v 3 SHEETS-SHEET}- Fig- 8- v WITNESSES nonn'is ELMORE CLARK, oF'PLAmvILLE; CONNECTICUT.

MACHINE FOR MAKING CORNER-BE AD BLANKS.

Specification of Letters Patent.

Patented June 8, 1915'.

Application filed September 29, 1914. Serial No. 864,041.

To all whom it may concern:

Be ,it known that I, NoRnIs ELMORE' CLARK, a citizen of the United States of America, and residing at Plainville, in the county of Hartford and State of C-onnecti cut, haveinvented new and useful Improvements in Machines for Making Corner-.Bead

' Blanks, .&c., of which the following is a specification.

Structures known as corner beads are commonly employed at the corners of walls, arches, windowand door 0 enings and the like and they consist of the body or bead proper and the attaching arms or wings. The arms or wings which are sometimes integ'ral with the body and sometimes consist of clips secured to the rear or sides of the body serve to hold the body with its outer edge spaced away from the foundation. When in use the entire structure except the outer edge is usually embedded in the plaster or cement of the post or wall. The head not only affords a straight edge for the plaster to work to, but it constitutes a rigid protection to the exposed corner.

In the past it has been customary to make corner beads of sheet iron or steel and as this material rusts or corrodes very badly when exposed to ordinary atmospheric conditions, it is necessary to protect it in some way. The corner bead is therefor usually protected by hot or cold galvanizing or sherardizing. Owing to the many openings, channels and pockets in the structure it takes up a relatively lar'ge'amount of the zinc or spelter' in hot galvanizing which makes this process very expensive. Electroplating or cold galvanizing as it is called is also expensive and requires expensive apparatus and skilful attention and is not satisfactory. The thin metal of the bead is also liable to be eaten through or weakened by the plating solutions. Sherardizing is s also expensive when properly done and there is great danger of burning the thin metal unless great care is taken in the process. If the bead is made from previously plated stock-the plating flakes off or cracks when forming the bent edge in the. usual way, and it has to be re-coated. Paint is not permanent and is not at all approved for such constructions. None of these methods are really permanent when practised in the commercially practical way.

- I have discovered an exceedingly simple and inexpensive method of providing a much superior finish and appearance to the edge of the bead and protecting it permanently. Only the mechanism is' claimed herein.

According to my invention the main protection is alforde by means of a stripflof non-corrosive metal such as pure zinc or zinc-foil secured around the edge of the body of the bead so as to constitute the outer surfaceor exposed edge when the head is in place in the plaster. In many cases it is unnecessary to coat the arms, wings or clips which attach the bead proper to the corner post or other support as those portions are entirely embedded in the plaster when in use and the lime in the plaster acts as a preservative. A better grade but somewhat more expensive product may be made by using galvanized stock and applying the zinc strip outside of this for the edge portion. In this way the attaching arms or Wings are protected by the galvanizing and the strip gives a double protection to the most exposed portion of the bead. The steel oriron stock should be'heavy enough to furnish practically all of the necessary strength be applied smoothly and securely so that it,

will look Well and will remain secure under the usual conditions of shipment and use. I have found that this may be readily done by forming tangsat the edges of the protective strip, inserting these :tangs inslots in a strip of the flat bead stock and bendlng the ends under; The bead stock 1s then folded to form the desired shaped nose or edge with the protective strip stretched across its outer face. The folding of the stock may be accomplished in any suitable manner for instance, as set forth in my application #698,078, filed May 17th, 1912 and in my Patent #1,129, l5etdated Feb. 23, 1915. 7

As the practicability of, any method of 119 protection depends largely upon its cost, if

t have sought to carry out my improved meth- 0d by simple and reliable automatic means capable of operation at high speed and requiring little attention; The iron or steel stock is fed into a machine and perforated o r slotted at intervals. The narrow protect1ve strip is fed into the machine through the perforating punch and tangs arestamped at its edges and inserted into the perforations in the stock. As the stock and strip are drawn along the tangs are bent un der. The stock and strip are then folded or bent to provide the desired form of nose or edge and the. desired type of arms or wings,

' or clips may be attached.

Details of the 'product and the, method and machines'for manufacturing will be un- -derst'oodifroni the following specification.

and claims and the accompanying drawings. Figure 1 is a diagrammatic side view and partial section showing the steps of the process ofsecurin'g the protecting strip to the stock. Fig. 2, 1s a side view of the toolsnecessary for perforating the stock, forming and inserting the tangs and clenching them. Fig; 3, is a transverse vertical sectional view showing the tools for perforating the stock. Fig. 4, is a transverse vertical sectional view showing the tools for forming the tan'gs on the protecting strip. I

' Fig. 5,-is a transverse vertical sectional'view showingthe gages for the stock and] the means for clenching the tangs. Fig. 6, is a transverse vertical sectional view showing the finalclen'ching, of the tangs. Fig.- 7, is

a fragmentaryplan View showing parts of the punch" and die mechanism, the gages5-the tang bending plate and parts of the stock and the strip 1n the process of treatment. Fig. 8; is a bottom view of a fragment of the stockandprotecting strip showing the perforations and the tangs, one tang being bent over or clenched and the other in its position before clenching. Fig. 9, is a perspective view of a: fragment of a corner bead embodying my improvedprotecting means.

-Fig. 10, isa fragmentary perspective view of another: form of corner bead-protected according to myinvention. Fig. 11, a fragmentary sectional'view showing the tools for attaching a protecting strip in a somewhat different manner from the method of Figsll to 8 inclusive. Figs-12, 13 and 14 are fragmentary perspective views of other forms of-corner bead with a protecting strip embodying my invention. ;Fig.'

special set of tools in an'ordinary autcn'natic continuously operating reciprecating press menses a double roll feed. One pair of rolls 24 feeds .in the lengths of the base or body stockand the other pair of rolls 25 draws or feeds out the product. In the drawings the thickness of the body stock and the protecting strip and particularly the latter, is very much exaggerated on account of the dimculty of showing it'in its correct proportions.

The perforations or slots 26, 26 in the body stock are formed in pairs on opposite sides of the center line X-X and the ends 27, 27 are rounded (see Fig. 8). The tangs 28, 28 are formed 1n corresponding pairs at the edges of the protecting-strip and are tapered or inclined on their edges as at 29, 29. The spacing is such that the tangs are inserted substantially in the centers of the slots so that the inclined edges are drawn over the rounded ends of the slots when the tangs are bent over or clenched. This constitutes a somewhat yielding or loose connection between the strip and the body stock "so that when the stock is bent to form the bull nose or other shaped edge as in Figs. 9 and 10, the strip may be stretched smooth and tight over the edge without pulling out the tangs. g

The die 30 for each slot is in two parts as shown in Fig. 3 and the opening 31 is tapered to facilitate discharge of the punchings. Each punch 32 hasa large cylindrical body 33 which is slotted at 34 to provide a guide passage. for the protecting strip 20. The unches are made very short and have a relatively short'stroke' so as to operate at high speed without breaking. The punch block 35 is guided onthe posts 36,36 and pulled up by the rod 37 and forced down by the abutment 38. Themain part of the gate or'punch carrier thus-hasa longer stroke than the punches 3 2, 32. The punch block 35vis only raised sufiicientlyto clearthe punches shown-in'Fig. 3. The stock is held down, and-stripped from the punches by the plate 39 and the punchblock 35 is recessed at 40 for the stripper 39. The stock is guided by rotary gages 41 which may be laterally adjustable as indicated in Figs. 5 and 6. One of them may be pressed'bya spring 42 toward the other to allow forslight variations in width of stock. The holders 43 may have slots 44 for the clamp bolts 45 to permit lateral movement. 7

The tang die 49 is supported above the body stock which feeds through the passage 50 under-it. Each tang'opening'51 is substantially f triangular. having two cutting edges 52 and 53- and' a bending -shoulder or edge 54 and a slot 55exte'nding parallel to the shoulder and the directionfof feed of the strip lEaoh punch 56' is correspond- .ingly triangular in' c'ross section with" two cutting edges 57 andts and 'a benddownward so that the tangs 28 enter the slots 26 in the body stock. As the stock is fed forward the tangs are bent over by the inclined shoulder 63 as in 5 and clenched against the under side .of the stock as in Fig. 6. The plate 64: forced down by the spring 65serves as a presser to hold the strip against the stock andthus assist the assembling operation. The rolls 25 pull forward-the united stock and strip and may serve to give additional closing or clenching pressure to the tangs.

The body stock with the attached protecting strip is then bent or formed to provide the desired shaped edge or nose. The form shown in Fig. 9 is what is known as a bull nose body. The attaching arms or fingers 70, are formed by cutting and bending out' parts of the sides and the arms are united by side wires 71, 71.

In the form shown in Fig. 10 the sides arev bent laterally to form attaching arms or wings 72, 72 with perforations 7 3' for the plaster. I

Fig. 11 illustrates a difi'erent form of mechanism for" attaching the protecting strip 75 to a. previously formed bull nose bead 76. The strip is supported on a die 77 having a channel 78. The bead is moved downward and forces the strip 75 into the channel 78 thus bending the strip into the dotted position, The side formers 79, 79'

are then moved inward so as to bend the edges of the strip against the sides of the bead. The formers may be provided with points 80 at intervals for punching parts of the strip into the sides of the bead and thus making their union'more secure.

Fig. 12 illustrates such a bead with the protecting strip 75 indented at 81 into the body of the bead 76." This form is shown as having attaching arms 82 of wire.

Fig. 13 shows a bead 85 of T-form wit] the protecting strip 86 having its edges 87 folded around the sides of the bead. This form is particularly adapted to be supported by separate arms or clips such as 88.

In the form shown in Fig. 14 the head has a broad nose 90 and the protecting strip 91 has its edges 92 bent beneath the sides of the nose. In these two latter forms the edges may be more securely attached by Welding or the like.

ln all forms of the device as shown and dcscribccLit will be noted that the edges of the protecting strip are in position to be completely covered by the plaster when tangs.

in use on a corner 94 as shown in Fig. 15 thus-preventingthe strip from being disengaged. This also shows how the entire structure except the protected outer edge or nose is completely enveloped when erected. Products such as shown in Figs. 9, 10 and 14 are particularly desirable when made of previously plated or galvanized stock and provided with the protecting strip before bending. This strip in fact actually to a large extent prevents the plating from scaling or cracking when bending the stock into the bead form so that the bead is better qualified to withstand corrosion even after the strip is removed. The protecting strip affords a much better finish than the ordinary galvanizing and constitutes a perfect protection against corrosion under the conditions of ordinary use.

What I claim is 1. In a machine for making corner bead blanks, a support for a sheet metal body strip, edge-engaging and smoothing rolls at the sides thereofhaving grooves with inclined walls affording converging edge-engaging surfaces substantially in the plane of the edges of the strip for smoothing the edges without bending the strip, means for directing a relatively 7 narrow protecting strip midway between the edges of the body strip and means for joining the edges of said protecting strip to portions of'the body strip on opposite sides of. the center line thereof between the edges of the body strip.

2. In a machinefor-making metallic corner beads, guides for the stock, punches for forming small perforations in the stock, means for supplying a thin protecting strip, cutters for forming tangs at the edges of the strip, means for inserting the tangs in the perforations, and means for bending the 3. In a machine for making metallic corner beads, guides for the stock punches for forming small perforations in the stock, means for su plying a thin protecting strip, cutters for the strip and means for deflecting the strip toward the stock.

4. In a machine formaking corner bead blanks, means for formingopenings in a strip of body stock at intervals along its length on opposite sides of its center line, -means for supplying a relatively thin and narrow protecting strip, means for inserting portions of the oppositeedges of said protecting strip into the openings in said body stock on opposite sides of the center line and meansfor clenching said portions.

5. In a corner bead machine, means for inserting the tangs of a protecting strip in the holes of the stock, stationary inclined shoulders and means for drawing the stock and strip along so as to force said tangs against said-shoulders.

orming tangs at the edges of a corner bead machine, punch and die embers for perforating metal stock,

means for guiding a thin strip above said punch member, punch and die cuttersfor forming tangs in said strip, and means for directing said strip toward said stock to insert said tangs in the perforations.

' 7. In a corner bead machine, punch and die members for perforating metal stock,

1 means for guiding a thin strip above said punch member, punch and die cutters for forming tangs in said strip, and means for directing said strip toward said stock to insert said tangs in the perforations, and

means for bending said tangs.

8. In a corner bead machine, a bed having die openings and die cutters, a reciprocating head having punches for registering with :said openings to form perforations in the ,'220 stock and punch cutters co-acting with said die cutters te form tangs in a protecting gs'trip, said bed having guide passages for said stock and said head having a guide passage for the protecting strip.

" .s 9. In a corner bead machine, a bed having 'di'e openings and die cutters, a reciprocating head. having punches for registering with said openings to. form perforationsin the stock and punch cutters co-acting with said 80 die' cutters to form tangs in a protecting fstrip, said bed having guide passages for said stock andsaid head having a guide passage-for the protecting strip and means for securing said tangs in said perforations.

10. lln a corner bead machine a guide for aperforated stock, a cutter die above said guide, a punch cutter reciprocable above said die for forming in co-action therewith downwardly projecting tangs. in a strip,

I 0 means for. directing said strip toward said stock and inserting said tangs in the perforations in said stock and means for bending -said tangs for interlocking said strip and stock.

11. In a machine for making corner bead blanks, .means for feeding body stock, punch and-dig'members for forming openings in .;,said stock on opposite sides of the center line thereof at intervals along its length,

5 means. for guiding a relatively thin and narrow protecting strip, means for inserting ;portions of said strip through said openings zen-opposite sides of the-center and means for clenching the portions so inserted. V

12. In a machine for making corner bead blanks, punch and die members for forming the stoc 'forated stoc beneath said die for a punch and a slot extending from one edge of said opening in the direction of feed and a punch. for cotiperating with said die and cutting and bending a tang into said opening. I

14. Mechanism comprisinga .die havinga bending shoulder, two cutting edges extending transversely to said shoulder, an opening bounded by said shoulder and said edges and a .slot extending from said bending shoulder, a punch having, cutting edges and 'a bending shoulder for cooperating with said die edges and shoulder for cutting a tang and bending it down into said opening and means for feeding stock so that said tang will pass from said opening through said slot.

- 15. Mechanism comprising a die having two openings and two parallel slots, one extending from one edge of each opening, punches for forming and bending tangs into said openings and means for feeding stock in a direction parallel to said slots.

16. Mechanism comprising a die having parallel shoulders and slots continuing therefrom in the. direction of feed and cutting edges extending transverse to said shoulders and punches having shoulders and cutting edges cooperating with said die shoulders and edges for cutting and bending tan 1%? Mechanism comprising .a die plate having two openings of substantially triangular cross section with parallel slots extending therefrom, punches of substantially triangular section coacting with said die openings to force tangs thereinto, said slots permitting the feed of the tangs. without lifting.

18. Mechanism comprising a die plate with a die opening having a slot extending therefrom parallel to the direction of feed of the stock, a punch for forcing a tang into said opening and a stripper holding the stock against said die plate so that the tang will travel in the slot.

19. Mechanism comprising a die plate having a tang opening and a slot extending therefrom, a punch for forcing a tang into said opening, means for holding the stock down against-the die plate and means beneath the stock for bending the tang as the stock is fed along. 1

20. Mechanism comprising a die plate having a tang opening dud a slot extending therefrom, a punch for forcing a tang into said opening, means forholding the stock down ag inst the die plate, means beneath .for bending the tang as the stock and means for feeding per-' plate for reis fed alon ceivingfisaid tangs,

, echanism comprising punch and die members for perforating a strip of metal,

lateral gages for the strip, and punch and die members for forming tangs on a second strip, said perforating die forming a movable guide for said second strip. 7 22. Mechanism comprising a support for perforated stock, a bending shoulder beneath the stock, guides for directinga strip having tangs toward saidstock and inserting the tangs invthe perforations, means for holding the strip and stock together and means for drawing the stock and strip forward and thereby bending said tangs over said shoulder.

23. In a machine for making corner bead blanks, means for guiding a strip vof body stock, means for guiding a strip of re1a-'15-' tively thin and narrow protecting material in line with the center of said body stock, means'for securing portions of the edges of said protecting strip at intervals to said body strip along opposite sides of the center 20 p line thereof between the edges and leaving the-edges of the body stock free and means for feeding out the product.

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