US2574435A - Burr - Google Patents

Description

o. B. MAXIM ET Al. 2,574,435

BURR

Filed Feb. 12, 1949 Nom 6, @Si

Iig. 5

INVENToRs. Oren B Maxlm Roger MPeaboxiy Patented Nov. 6, 1951 UNITED STA-.TES PAPNT @iICE BURR- Oreii' B. Maxim andA Roger M. Peabody, Waterbury,Conn., assignors to Scovill Manufacturing Company, Waterbury, Conn., a corporationv of Connecticut Application February 12, istasr'iai Nb. isms* (c1. sssv) Y 6 Claims.

1 This invention relates to rivets and burrs of the open-type such as used inv attachingv portions of garments together and especially for' reinforcing the jointed seams of garments of thev Another object of this invention is to provide a burr with an inwardly set base wall having the maximum of iiat expanse so that the rivet tack point in the setting operation will contact the base wall perpendicularly in any position and pierce axially therethrough without danger of biasing the rivet tackv shank.

With this and other objects in view, the invention consists in certain novel features of construction hereinafter more particularly explained.

lin' the drawing: i

Fig. 1` isl a bottom plan View of the rivet burr.

Fig. 2 is a vertical sectional view through the burr.

Fig. 3 is an elevation of a form of rivet tack that is used in connection with the burr.

Fig. 4 shows a cross sectional View of the burr and a side view of the tack pierced through several plies of fabric just prior to the piercing of the burr.

Fig. 5 is a cross sectional view'showing the burr and tack as they appear set upon the several plies' of fabric, and

Fig. 6` is a view similar to Fig. 4 but showing the inherent fault of the prior burrs whichv my invention overcomes.

With the heretofore known open-type of burrs, there has beenconsiderable diiculty experienced in controlling the axial alignment of the rivet tack and the burr during the setting operations. The reason for this was that the construction of the old burrs was such that they would have a tendency to bias the tack shank during the setting operation with the result that the head of the tack as well as the burr itself would not lie ush or parallel to the surface of the garment joint, and frequently the relative position of the burr and tack head would be considerably off from a 2 common center relative to each other. Also, the fact that the pointed ends of the conven-Y tional tack shanks are never in line with the center axis of the tacks was another factor that! was the cause of defective burr setting with the old type of burrs. The new burr here disclosed isV designed purposelyA to eliminate such faults and still make use of the conventionaltyp'e of' tack? for theourr riveting operation.

Referring now to the drawing in which like reference numerals denote like parts throughoutthe several views, the numeral Hi designatesI generally'an-'open-type burr comprisinga iiat an# nular'fflan'ge l i and a cylindrical barrel l2 formedupwardly from the center of said iiange. end of the barrel opposite from the flange is pro# vided with a. closed iiat base end` I3 that is seti inwardly from the outer end lli of the barrel and joined to it by an inturned supporting. wall I5 and in contiguous relationship with the inner surface of the barrel i2.

As pointed out in the objects of the invention, the purposeof this burr is to attach several plies of materialk together such as might occur at a juncture seam or at the corner of a pocket construction on an overall garment. Thisv is accomplished with the use of the above described burr I in cooperation with a rivet tack i6 which` may be made of a suitable soft material to per mit an easyy balling over or upsetting operation of the shank coincident with the burr setting operation.

The rivet tack I6 is of ther usual form of tack` having a head I1, and a tapered' shankl i8 which is sheared off on opposite sides as at it tofprovicle a sharp pointed end Ztl. As pointed out above, all conventional forms of tacks are never made so that their pointedl ends are in direct align-- ment with the center axis of the shank. Thus in spite of the fact that a conventional tack 3tmight be axially aligned with the apex 3i of a conical base 32 of an old type of burr 53 such as shown in Fig. 6, it was impossibleY to have the pointed end 3e of the tack 3! always strike the apex 31 with the result that the tack shank would be frequently biased in the setting operation and The I assure that the tack I6 will always pierce through the closed base end I3 of the burr IU in a perpendicular manner, this is accomplished in the present construction by making the base end I3 fiat and over as large an area as would be permissible under normal manufacturing practices. To produce sufficient strength in the supporting wall I5 for the flat base I3 of acharacter to prevent the base end I3 from tearing out during the burr setting operation, the upper surface of the base I3 is joined to the inner surface of the wall I5 by a relatively large fillet as at I5a.

To facilitate the piercing of the tack point 2U through the base end I3 and also have the base end I3 as flat as possible throughout the entire expanse, the wall of this base is also reduced in thickness so that it will be somewhat less than the normal material thickness of the burr. This is accomplished by suitable punches striking the opposite surfaces of the base end I3 in the manner of a planishing operation and with a sufficient blow to drift or extrude the material of said base end outwardly and form up a surrounding rib 2i of the excessive stock, it being understood that the upper punch will be formed to provide for the fillet I5a.

In the setting of the burr fastener upon a garment seam, such as represented by the several pieces of fabric 22, the burr I0 and tack I6 may be machine fed to the opposite sides of the fabric plies 22 with the barrel end I4 of the burr I0 initially disposed against one Surface of the plies 22 as shown in Fig. 4. The tack I6 will rst pierce through the plies 22 and then the pointed end 20 of the tack will impinge and pierce through the base end I3 and pass up into the barrel I2 of the burr I0, where, by the use of suitable tools, the tack shank I8 will be hailed over and clinched within the confines of the barrel I2 and at the saine time the barrel I2 will force its way into the fabric plies 22 so that only the burr flange I0 and tack head IIS will remain exposed on the outside of the fabric plies 22. The rib 2l, as provided in the planishing operation stated above, after the setting operation retains itself in the form of a shoulder within the burr such as to prevent the balled end of the tack shank from easily pulling out from the set burr, this shoulder being clearly shown in Fig. 5 as at 23.

In addition to the feature that the burr is designed so as to preclude a biased setting of the rivet tack relative to the garment, it also has the same advantages set forth in the rivet and burr construction as claimed for the Fenton patent referred to above in preventing the threads or fibres of the material to which they are applied from being drawn up through the hole in the burr base coincident with the burr setting operation.

It is, of course, obvious that minor changes in details of construction may be made for the disclosed rivet and burr without departing from the scope of the present invention as set forth in the appended claims.

We claim:

1. In a rivet burr construction for attaching a plurality of ply members together, a burr comprising a flange and a barrel extending from said 4 flange, said barrel having a closed end in the form of a flat base set inwardly from that end of the barrel opposite from the ange, and a rivet tack having a pointed end, said burr adapted to have its edge portion adjacent its base end set against the ply members, and said tack shank being driven through said ply members and through said flat base in a perpendicular manner at any point that the pointed end of said tack may contact said base, the shank of said tack being balled over or upset within the connes of said barrel to firmly clinch the tack and burr together through the ply members.

2. A burr construction as defined by claim 1 wherein substantially the entire expanse of said flat base is reduced in thickness relative to the normal stock Ithickness of said burr to facilitate the piercing of the tack shank therethrough.

3. A burr construction as defined by claim 1 wherein the fiat base is reduced in thickness relative to the normal stock thickness of said burr and forming an annular rib about the inner surface of said base that serves as a shoulder to prevent the upset tack shank from easily pulling out from said burr.

4. A burr` construction as defined by claim 1 wherein the flat base is set inwardly relative to the end of said barrel by an inturned peripherial wall contiguous with the wall of said barrel.

5. A burr comprising a ange and a cylindrical barrel extending from said flange, said barrel havingl a closed fiat base end set inwardly from that end of said barrel opposite from the flange by a surrounding support wall, the material thickness of said base being less than the normal thickness of said burr, and a reinforcing rib surrounding said fiat base opposite from its supporting wall.

6. A burr comprising a flange and a cylindrical barrel extending from said flange, said barrel having a fiat closed end opposite from the flange, substantially the full expanse of said closed end being set inwardly from the end of said barrel by a supporting wall lying inside and contiguous with the inner surface of said barrel and providing a projecting annular rim of double wall thickness, the material thickness of said base being less than the normal material thickness of said burr and of a character to permit a tack point to readily penetrate therethrough.

OREN B. MAXIM. ROG-ER M. PEABODY.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 175,191 Stephens Mar. 2l, 1876 663,520 Shipman Dec. 11, 1900 1,324,089 White Dec. 9, 1919 1,760,835 Carr May 27, 1930 1,783,113 Fenton Nov. 25, 1930 2,058,311 Hayden Oct. 20, 1936 2,133,220 White Oct. 11, 1938

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