US 2417423 A
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INVIN'I'OR' lJimi-:p11 C'. Lang `Patented Mar. 18, 1947 DOUBLE ENDED STAPLE Joseph C. Lang, Pittsburgh, Pa., assignor to Bocjl Corporation, Pittsburgh, Pa., a corporation of Delaware Application September 29, 1943, Serial No. 504,256
6 Claims. 1
This invention pertains to the art of stapling and is for an improved staple construction and for a method of making same. Y
Conventional staples normally have a bridge portion with deep Vending substantially parallel legs. According to the present invention, there is provided a staple having a bridge portion with two pairs of legs, one extending upwardly from the bridge, and one extending downwardlyv from the bridge. These staples are designed for use in ilelds where conventional staples are entirely inadequate. For example, in thebuildin'g industry it is frequently desirable tounite sheets of wall board or plaster board to studding by fasteners which are completely concealed. A staple made in accordance with the present invention can be used for this purpose. It is first driven into the studding in such manner that one pair of legs enters the studding, while the other pair of legs projects perpendicularly from the face of the studding. When a sheet of plaster board is forced against the studding, the upstanding legs enter the plaster board. Both pairs of legs are preferably so constructed that when they penetrate the material into which they are driven, they will diverge or spread, to increase the holding power of the staple.
While I have mentioned that the staple of the present invention is adapted for use in the building eld, this is only typical of one use, and it will be understood that the, staple may be used elsewhere where it is desired to connect two pieces together with a fastener ofthe staple type, and particularly to have a completely concealed staple.
According to the present invention, it is further contemplated that the staple will preferably be cut from sheet metal, Conventional methods of forming cut lsheet metal staples would result, in the present instance, in a considerable waste of into one of twoparts to be joined, and with the other of the two parts to be joined brought into position for stapling;
Figure 3 is a view similar to Figure 2 showing the staples completely driven into both parts;
Figure 4 is a plan view and shows the manner in which the staples of Figure 1 may be nested to save space in packing, or for use in a magazine type f driver; f l
Figure5 is a View similar 'to Figure 1, illustrating the manner of developing a single staple;
' Figure 6 shows the method of slitting a strip of metal to produce the staples of Figure 5;
Figure -7 is a view similar to Figure 6 showing the steps in the development of a staple such as l that illustrated in Figure 8;
Figure 8 is a perspective view of the modified V staple; and,
metal. My invention contemplates a method of forming the staples from a narrow strip of metal in succession, without substantial loss of any material. This is effected by slitting and expanding the metal from which the staple is'formed and constitutes improvement on my copending application, Serial No. 498,627 led August 14, 1943.
. My invention may be more fully understood by reference to the accompanying drawings, in
Figure 1 is a perspective view of a single staple embodying my invention;
Figure 2 is a more or yless schematic View illustrating the manner of using the staple of Figure 1,` with the staples being shown completely driven 5.6
Figure 9 is a View similar to Figure 7 showing a further step in the development of the staple shown in Figure 8. l`
Referring first to Figure 1, the staple, which is preferably blanked from sheet metal, has a primary set of legs designated 2, and a secondary set of legs designated 3, these legs extending in opposite directions from a bridge portion 4. The primary legs 2 are preferably'closer together than the legs 3 so that, at the outside of the staple, there is formed a bevelled shoulder 5. The overall width of the pair of legs 2 is preferably such that they will nest or t between the two legs 3 of a correspondinglyl formed staple. The primary legs 2 have outwardly bevelled or chiseled pointed ends 2c, such that when these ends are entered into material into which the staple is driven, thev material tends to spread thezlegs apart. Likewise, the legs are similarly shapedat 3a so that when they penetrate the material, they will tend to spread apart. a
By forming the legs at one end of the staple closer together than the legs at the other end, the staples may be blanked from av narrow ribbon or strip of metal as shown in Figure 4, with very little waste lof material. Practically the only material which iswasted is that which is punched out in forming the bevelled surfaces 2a on the legs f 2. Also, because of this manner of forming the- 4end of the-staple may first be driven. For simplicity in the design of the driver, however, it is be driven as shown in Figure 2 so that the legs 2 are rst driven into the material designated A. In this operation the top of'the cross head or bridge 4 which is at, may be engaged by a staple driver of any known or preferred construction, suitably modified to There is a shoulder at 8 on staple, the legs 6 being offset inwardly from the provide clearance for the legs 3. When the staple y is driven, the bevelled ends tend to cause the legs to spread apart as clearly shown in Figure 2.
There is another advantage in driving the small end of the staple first. This arises from the fact that in many instances'one end of the staple will be driven in relatively firm material. such as the wood studding of a building. In Figure 2, A designates such studding. The other end of the staple in many cases, will be driven into softer material. such as composition board or wall board. In Figures 2 and 3. B designates a panel of such composition material.
Within certain limits,.the holding power of the staple is increased by increasing the spread between the legs. For example, if the two legs coincided, the `staple would have no more holding power than a nail of corresponding section. Consequently.'as the spread between the legs increases, the holding power of the staple alsov increases up to a certain point. Consequently, because the legs of the staple can exert less holding power in the composition board B than they will in the solid wood A, it is desired to have those legs 3 which are widely spacedenter the softer material,4 and to have the more closely spaced legs 2 which have less holding power in the stronger material.
In using these staples, large numbers of them are driven into the stud A and into adjacent studs in a, building operation. Then the'panel B is forced against the studding. This causes the legs 3 of the staples to penetrate the panel B and in penetrating the panel they also tend to spread apart. The length 'of the legs 3 is calcu' lated to be insufficient to completely penetrate -the panel B. However, in instances where holding power, without respect to appearance is to be taken into consideration. it is `feasible to have the legs 3 longer and have them completely penetrate panel B. and be clinched over on the outer surface of the panel B.
While I have described the staple used in an operation where there is a wood stud and a, composition panel to be connected, this is purely by way of illustration, -and it, will be obvious that the invention is applicable to various other securing operations where wood is fastened to wood, or where panel boards are connected as elsewhere.
Instead of cutting the staples as shown in Figure l, the method of cutting illustrated in Figures,
5` and 6 maybe used. 'In this case, thel legs 2 are separated. only by a slitandthe bridge of the staple between the legs3 is pointed instead of fiat as shown in Figure driving pressure to the point 4 vof the bridge of the staple in Figure 5 tends, when the staple is entering hard material. to spreadl the legs 2 apart, and this also tends to further expand the distance betweenthe legs 3. Figure 6 shows how these staples may bel blanked from a narrow strip, how they may be nested for the purposes herein above mentioned. 1 v r A somewhat more effective: way of making-the staples.;isjillustratedjin Figuresl 1 ,f8 and 9. Referring first to Figure 8, the staple has two pairs of legs, the legs of one pair being designated 6, and the legs of the other pair being designated 1. These legs have bevelled or chiseled ends as l. The application of and described in connection with Figure 1, and the pair 6 .is separated less widely than the pair 1. each outer edgeof the legs 1 a distance equal to the cross section of the width of the legs 1. This isffor the purpose eX- plained in connection with Figures 1 and-4 of bl'anking the staples from a,A continuous strip with a minimum waste of material, and for allowing the staples to be nested in packaging and in use.- However, the staples have a bridge portion 9 which is bowed in such manner that it presents a convex surface between the legs 1 anda concave surface between the legs 6, This form of staple is produced as shown in Figures 7 and 9 by forming a straight slit l0 at regular intervals along the center line of the strip of the metal Il. At one end the slit` is forked to provide two divergent arms l2, andextending longitudinally of the strip toward the next slit is a short slit I3 forming a continuation of the'slit I2. When the strip has been slit in this manner, it is then progressively spread in a lateral direction, as more fully explained in my copending application', Serial No. 498,627 led August 14, 1943, above referred to, by forcingfprogressively larger punches into vthe slits l0 and I2. Eventually each slit is expanded into a Y-shaped opening shown in Figure 9, the Y-shaped opening being designated I4.. The staples are then severed on the dotted lines shown in Figure 9 to produce individual staples shown in Figure 8. Thus by starting with the narrow strip of material, the resulting staple has a width substantially greater thanv the width of the original strip. This is a desirable condition because a wide staple is cut and formed from narrow strip metal without any waste of material. Because the holding .power ofthe legs l,v being spaced from each other, is greater than the hold- `ing power of the corresponding legs 2 of the staple `shown in Figure `shown in Figure 8 is to be preferred in many operations where considerable holding power is A required. which result from is provided in the 551 form of a double ended staple and that this staple is adapted for use in many operations where staples could .not heretofore provides a fastener-for use in a, manner which is unique. i
While I have illustrated and described certain preferred embodiments of my invention and the method of producing the staples, it will be understood that this is by way of illustration, and that various changes and modifications may be madewithin the contemplation of my invention` following claims, and
and under the scope of the instead of being cut from'sheet metal the staple may be formed from wire stock.
I claim: 1. A staple having two legs and a bridge portion and ,having a second'pair of legs extending from the br'llge portion the first pair, the bridge portion of the staple being arched in one direction, both pairs of legs and the bridge being in a common plane.
2. A staple having two legs and 1, the form of staplev tion recite in the l be use'cl.v In fact, itV
in a direction opposite' a. bridge porof the other, both sets tion'and having a second pair of legs extending from the bridge portion in a direction opposite the rst pair, the bridge portion being arched 3. A double ended stapleV having two setsv 0i' points, the points of one set extending in a direction opposite the points of another and a common bridge portion connecting the points on one side of the stapley with the points on the other, said bridge portion being arched whereby the application oi' driving force to the bridge tends to separate one set of legs.
4..A double ended staple having two sets of legs, one set extending in a direction opposite the other, the staple having a common bridge portion between the legs of one side and the legs of legs having outwardly divergent chisel-like terminal portions, one set of legs being spaced more widely apart than the other set qf legs and having beveled shoulders attheir inner ends against which the points of a similar staple may set when the staples are nested.
5. A staple having a vbridge portion with a pair oi' legs extending in opposite directions from each side of the bridge portion, the legs and bridge being in a plane, the axes o! the legs of one pair said A6 being closer together of the other pair, the each pair being open.
6. A staple having a bridge portion with a pair of legs extending in opposite directions from each side of the bridge portion, the legs and bridge being in a plane, the axes of the legs of one pair being closer together than the axes of the legs of. the other pair, the space between the legs of each pair being open, andat least onepair of legs having outwarly divergent chisel-like ter= minal portions.
JOSEPH C. LANG.
REFERENCES CITED The following references are of record lin the ille of this patent: 'l
UNITED STATES PATENTS Number Name Date 1,995,173 Ehle et a1. Mar, 19, 19.35 1,036,229 Harreld 1; Aug. 20, 1912 673,216 Morehouse Apr. 30, 1901 1,138,211 Graham May 4, 1915 FOREIGN PATENTS Number Country Date 284,898 yBritish Feb. 9, 1928 14,716 British Oct. 29, 1887 han the axes o! the legs space between the legs of