US1875709A

US1875709A - Manufacture of rivets

Info

Publication number: US1875709A
Application number: US397795A
Authority: US
Inventors: Marion M Cunningham
Original assignee: Bendix Brake Co
Current assignee: Bendix Brake Co
Priority date: 1929-10-07
Filing date: 1929-10-07
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06

Description

Filed Oct. 7. 1929 I INVENTOR 4 MARION M. CUNNlNGHAM BY J;

A ORNEY Patented Sept. 6, 19 32 UNITED STATES PATENT OFFICE- MARION M. CUNNINGHAM, OF SOUTH BEND, INDIANA, AssI oNon T0 BENDIX BRAKE COMPANY, OF SOUTH BEND, IND ANA, A CORPORATION OF ILLINOIS MANUrAcIUnE ou RIVETS I Application-filed October 7, 1929. Serial No. 397,795.

This invention relates to the manufacture of rivets and is illustrated as embodied in the apparatus for forming a novel type of rivet adapted for use in securing the friction lining to the brake shoe of an automobile brake.

The invention is particularly designed to produce, in an expeditious manner, a very simple form of rivet shaped at one of its ends to accommodate a plug member. In one preferred embodiment of my novel process relatively thick tubular stock is fed vertically through a rotatable guide member, the stock being protruded through openings in a rotatable indexed die or support plate toward a rotating shaping tool in axial alignment with the stock and preferably but not necessarily moving toward the same and adapted to spread the outer end of the stock to form a cup-shaped recess in the end of the rivet. The stock is then severed to complete the rivet and subsequently filled with the aforementioned insert to complete the rivet assembly.

According to another feature of my invention, a molded type of brake friction material is provided with openings of predetermined bore to receive the rivets effected by my aforementioned novel process, and which rivets are extended through openings in a brake shoe rim and subsequently upset on the inner face thereof to firmly secure the lining to the shoe.

Other features of my invention, including novel steps in forming the product, details of construction and combinations of parts will various dies and their relative position in one step of the forming operation.

As disclosed in Figure 3 of the drawing, one

form of, apparatus for efiecting my novel rivet includes an" indexed rotatable lo-wer die mem ber 10 provided with a plurality of annularly spaced two-diametered recesses 12, the first of these "openings has in axial alignment therewith a rotatable tubular guide member 14 adapted to receive relatively thick copper, brass or other copper alloyed stock from which the rivetsv may be fabricated. The tubular stock is fed downwardly through the rotating guide 14 protruding through the smaller bore of the recesses 12 and at the same time a lower forming or spinning tool 16 rotating in opposite direction to the direction of rotation of the guide member 14 is movedupwardly in axial alignment with the stock, said tool being provided with'a cylindrical pro jection 18 which telescopes within the endof the stock.

Fillets

20 and 22 of the tool and die'plate serve to shape the end of thestock into the cup shape structure disclosed in Figure 4, the movement ofthe stock and shaping tool being synchronizedto be stopped when the end of the projection 18 reachesthe bottom of the die plate. The forming tool is then withdrawn and the rivet cut to length by a laterally movable cutting tool 24 as disclosed in Figures 3 and 4. 1 v A The die plate 10 is then rotated to position the rivet beneath a ram member 26 (Figure 3) cupped inits end and loaded with a graphite, lead or other suitable. cylindrical friction filler orplugr member 28. The ram 26 is then moved upwardly, forcing the-filler orplug into the cupped recess formed in the end of the rivet whereupon the ram is withdrawn. The die plate is then rotated to position indicated in Figure 8; and the rivetis then'knocked out ofjtheopening into a hopper (not shown) by suitable mechanism 30.

According to a second phase of my invention, the rivets so formed may be adaptedto secure the friction lining of a. brake shoe to the rim ,"fac'e thereof and my rivet finds par: ticular utility in securing the molded-type of friction lining in place. VVith thistype V of lining it is quite necessary that the secur ing means, such as the rivets, snugly lit the openings in the lining. The molded lining, preformed in manufacture, is accordingly drilled and counterbored to provide openings corresponding in diameter to the two diameters of my novel rivet. The lining is then placed upon the rim face 82 of the brake shoe 34: disclosed in Figure 1 and the rivets formed by my novel process inserted within substantially coaxial openings in the lining and rim face.

, Theends of the rivets may then be upset upon the inner face of the rim, as clearly disclosed in Figures 1 and 2, the upsetting of the rivets serving to force the shank portion of the same passing through the body of the lining and rim into close contact'with the walls of the openings therein. I also suggest that the lining be recessed to a depth so 'that the surface of the plugs 28 in the rivet are flush with the surface of the lining-all as indicated in Figure 1. A very secure attachment of the molded lining to the steel rim face is thus'effected, inasmuch as the cup-shaped portion of the rivet and its shank portion closely nest within the openings in the friction lining, the remainder of the shank portion being securely affixed to the body of the rim with the upsetting. The tight fit of the rivets in the lining and rim precludes relative movement of these parts and the ultimate result is that this type of lining is very securely attached to the face of a brake shoe.

While one illustrative embodiment has been described in detail, it is not my intention to limit the scope'of the invention to that particular embodiment or otherwise than by the terms of the appended claims. Part of the subj ec't-matter herein disclosed is covered by my divisional application No. 599,290, filed March 16, 1932.

I claim:

1. That method of forming rivets which comprises feeding and rotating tubular stock against an axially moving shaping tool to tating in opposite direction to the direction of rotation of the stock to provide a cup at one end of the stock to form a rivet head,

4. That method of forming rivets comprising axially feeding rotating tubular stock and moving toward the same, said tool having a part telescoping-within the bore of the stock and otherwise constructed to effect a cup shape to one end of the stock and subsequently severing said stock below said cup and filling said cup with a plug to complete the rivet.

In testimony whereof, I have hereunto signed my name.

MARION M. CUNNINGHAM.

severing the headed portion of the stock, and

of rotation of the stock'to provide a cup at one end of the stock to form a rivet head and subsequently cutting said stock to provide a short shank portion for the rivet.

3. That method of forming rivets which comprises feeding and rotating stock into engagement with a rotating spinning tool rotating in opposite direction to the direction of rotation of the stock and telescoping within the stock to form a cup at one end of the stock to form a rivet head of larger diameter than the bore of the stock, and severing from the stock the end portion so formed with a cup-shaped head. i i