US2574436A

US2574436A - Closed type burr

Info

Publication number: US2574436A
Application number: US75997A
Authority: US
Inventors: Oren B Maxim
Original assignee: Scovill Inc
Current assignee: Scovill Inc
Priority date: 1949-02-12
Filing date: 1949-02-12
Publication date: 1951-11-06
Anticipated expiration: 1968-11-06

Description

Nov. 6, 1951 o. B. MAXIM CLOSED TYPE BURR Filed Feb. 12, 1949 INVENTOR.

y m w a k B J W GY B Patented Nov. 6, 1951 UNITED STATES PATENT OFFICE chosen I I Oren B. Maxinn Waterbury, Conn assignor to Scovill Manufacturing Company, Waterbury, Conn, a corporation of Connecticut Application February 12, 19 19, Serial N 175,99?

3 Claims. 1

:Thisinvention relates to rivets and burrs such as used in attaching portions of garments to+ gether and especially for'reenforcing the jointed seams of garments of the type used in the heavy work industries or play clothing for children.

It is the general custom in the manufacture of heavy work clothing to have the pocket ends and garment joints riveted together for strengthening purposes by the use of a burr set against one surface of the garment and anchored in place by a rivet-tack pierced through the garment from the opposite side and clinched within the burr. It is also the custom in some garment constructions to have the burr positioned against the inside surface of the garment while the tack head is exposed to the outside surface of the garment; and in other garment constructions the reverse has been practiced in having the burr exposed to the outside surface of the garment while the tack head is concealed at the underside of the garment.

fieretof'ore the so-called closed-type of burrs, to which this invention relates, have been constructed with a central dome-like protuberance on the burr, such as represented by the burr disclosed in the Warner et al. Patent No. 1,179,585. This old closed-type of burr has been objectionable, in view of the fact that if such burrs were set on the inside of the garment the protuberance of theburr would at times be forced into the body of wearer of the garment much to his discomfort, whereas, on the other hand if such burrs were set on the outside of the garment, they could be more or less injurious to furniture due to the fact there was only a point contact of the burr against any surface they might contact, and furthermore such burrs would be more or less unsightly.

One object of this invention is to provide an improved closed type of burr in which there are no projections which will be injurious to the wearer or furniture. v

A further object is to produce a burr in which the upset rivet-tack is entirely concealed within the burr and wherein the anvil part of the burr that upsets the tack does not project beyond the normal outer surface of the burr.

Another object is to design a closed type of burr such that during the setting operation portions of the burr will collapse to produce a restricted chamber within the burr so as to confine and centralize the upsetting operation of the tack point and prevent it from extending only to one side in the hollow chamber within the burr.

The invention will be better understood from the detailed description which follows, when con-z sidered in conjunction with the accompanying drawing showing certain preferred embodiments of the invention, and wherein:

Fig. l is a top plan view of my rivet burr. Fig; 2 is a vertical sectional view through the burr.

Fig. 3 shows a cross sectional view of theb'u'rr anda side view of the rivet -tack pierced through several plies of fabric .just prior to the upsetting of the tack point within the burr, and

Fig. 4 is a cross sectional'view showing the burr and tack as they appear when set upo several plies of fabric. i

Referring now to the drawing in which like reference. numerals denote corresponding parts throughout the several views, the numeral Ill designates generally a closed type of burr com'-' prising a central domed top portion II and a surrounding annularbead portion I2 of hollow form joined to the domed portion H by a re-- entrant'or juncture angle 13. The b'eadiportio'n:

l2 opposite from the juncture angle .13 merges into a conical wall 14 constituting the back of the burr and having a central opening l5 sub stantially of square shape. The central domed portion' ll, bead portion [2, and conical back wall M together define an interior-hollow space of chamber l6 within whicha tack is upset as later explained; e

To assure that the tack will be centralized relative to the'burr during the "setting operation the diameter of the domed portion H is of the orderof about one-half the overall diameter of the burr itself and furthermore is formed into a spherical segmentor dome of a radius which is no greater than and preferably less than the diameter of said domed portion. This provides 1 an interior concave recess within the burr which winserve as a suitable anvil to straighten up the tack in case its shank is led into the burr on a bias in the burr setting operation and also assures that the tack point will be rolled or balled over sufficiently to firmly anchor the burr and tack to any garment support to which it is attached.

As pointed out in the objects of the invention, the purpose of this burr is to attach several plies of material together such as might occur at a juncture'seam or at the corner of a pocket construction of an overall garment. This is accomplished with the use of the above described burr ill in cooperation with a rivet-tack ll of conventional construction made of a suitable soft 3 material to permit an easy balling over or upsetting operation of the tack shank coincident with the burr setting operation.

The rivet-tack is the usual form of tack having a head l8 and a tapered shank I! which is sheared off on opposite sides as at 20 to provide a sharp pointed end 2|. The tack head [8 may be covered with a shell cap 22 closed thereabout so as to improve the appearance of the tack head when set upon a garment construction and in an exposed position.

In setting the burr upon a garment seam, such as represented by the several pieces of fabric 23, the burr l and tack [1 may be machine fed to the opposite sides of the fabric plies 23 with the smaller end of the conical back wall I of the burr l0 initially disposed against one surface of plies 23 as shown in Fig. 3. The tack point 2| will be properly alinedwith the opening in the conical back I4 and then the tack will be forced inwardly toward the burr l0 causing the tack shank 19 to pierce through the fabric 23 and balled over within the hollow chamber i6 as at 24 in Fig. 4. The domed portion ll serves as an anvil in the upsetting of the tack point 2| and in the setting operation will be backed up by a conforming die operating in any conventional form of setting machine not shown.

It is to be noted in Fig. 4, that by reason of the burr setting operation, where there are several plies of fabric, the angular position of the burr back I4 is changed by being set inwardly closer to the domed portion II. By thus changing the angular position of the back 14, it becomes apparent that the initial space between juncture angle l3 and the adjacent interior surface of the back wall is closed up which incidentally reduces the area defined between the domed portion H and back wall i4 and serves to prevent the tack point from biasing off to one side within the hollow chamber l6. Also by reducing the area'within the chamber a portion of the tack shank outside of the burr will be upset and bulged out as at 25. Thus there are provided two bulged

portions

24 and 25 to the tack shank IS on opposite sides of the burr opening l5. The opening [5 into the burr is shown as square. shape because this occurs in a natural manner by reason of forming the back wall l4 inwardly into a conical shape. The square hole l5 afiords a relatively secure anchorage between the burr and the tack on any garment seam construction to which it may be applied. Also, if

desired, the burr opening i5 may be made round in shape by the use of suitable-tools in the process of forming the burr back inwardly into conical shape. A round hole would serve as a better means to guide the tack shank centrally relative', to the burr during the setting operation.

Another favorable point for this improved burr, by reason of the conical back l4 having a central opening I5, is that the conical back ll adjacent the opening 15 provides for a relatively sharp leading edge that can more easily pierce or force its way into the fabric plies during the setting operation so as to embed the burr as much as possible into the fabric material and have only a small amount of the burr project above said material.

It is to be noted from the drawings the high point of the domed section II is positioned slightly below a plane passing across the top surface of the bead portion [2. It is also within the purview of this invention to construct a burr with the high point of the domed portion common with a plane passed across the top surface of the bead portion.

While there has been described and upon the drawing shown one embodiment of the invention, it is to be understood that the invention is not limited thereto but may comprehend other constructions and arrangements within the spirit of the invention and the scope of what is claimed.

I claim:

1. A burr of unitary construction comprising a central top anvil portion of outwardly domed shape, an integral surrounding hollow bead joined to said anvil portion by a reentrant angle, and an inwardly tapering back portion of frusto-conical shape extending from the outer edge of said bead, said domed anvil portion being substantially one-half the circumferential diameter of said bead and formed as a spherical segment of a radius no greater than its diameter so as to provide an interior concave recess capable of upsetting and balling over the pointed end of a tack, said back portion having a central opening in line with said anvil portion and providing a relatively sharp leading edge for said back portion.

- '2. A burr as defined by claim 1 wherein the apex of said domed anvil portion is disposed on a plane no higher than the high point of said bead.

3. A burr as defined by claim '1 wherein the apex of said domed anvil portion is disposed slightly below a plane common with the high point of said bead.

OREN B. MAXIM.

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

UNITED STATES PATENTS Number Name Date 446,139 Richardson Feb. 10, 1891 452,045 Jackson May 12, 1-891 663,520 Shipman Dec. 11, 1900 968,551 Goss Aug. 30, 1910 1,142,376 Stanley June 8, 1915 1,179,585 Warner et al Apr. 18, 1916 1,783,113 Fenton Nov. 25, 1930 FOREIGN PATENTS Number Country Date 593,524 Germany Feb. 28, 1934