US1346889A - Nut-machine - Google Patents

Description

E'. HoL'LlNGs.

ATTORNEYS.

E. HOLLINGS. 4NUT MACHINE.

APPLICATION FILED Aua.2o| |917.

3 SHEETSQSHEET 2.

1N VEN TOR;

BY-. E

A TTORNE YS.

E. HOLLINGS.

NUT MACHINE.

APPLICATION FILED AuG.2o. 1911.

1 ,346,889, Patented July 20, '1920i 3 'sHEers-SHEET 3.

IN VEN TOR.

BY A

A TTRNE Ys.

UNITED; STATES ERNEST HOLLINGS, OF CLEVELAND, OHIO.

NJIT-MACHINE,

Specification of Letters Patent.

Patented July 20,1920.

Application led August 20, 1917. Serial No. 1,857,306.v

T o all whoml z'zmag/ concern.'

Be it known that I, ERNEST HoLLINGs, a subject of the ling of England, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Nut-Machines, of which the following is a specification.

This invention relates to nut forming machines and more particularly to machines for hot forging or pressing nuts.

The object of the invention is to provide an improved machine for forming nuts from a bar by the combined action of a set of indenting, cut off, and crowning tools, and piercing punches, and in which the piercing tool is quickly withdrawn from the blank after the piercing operation and before the blank is ejected from the die to prevent the nut from freezing or shrinking upon the punch. A further'object of the invention is to improve the arrangement of the cams, levers and other mechanism for producing such movement of the tools and punches, and to also provide an operating lever for one of said ,tools which also serves as an oil res ervoir to lubricate the machine or parts thereof.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

In the drawings, which represent one form of machine embodying the invention, Figure 1 is a longitudinalv sectional elevation on the line 11, Fig. 2; Fig. 2 is a plan view; Fig. 3 is a sectional elevation on the line 3 3, Fig. 1, looking in the direction of the arrows; and Figs. 4, 5, and 6 are respectively a side elevation, plan and end view on a larger scale, of a rocker lever.

The machine shown in the drawings comprises a suitable frame 1 Vserving to support the bearings for three operating shafts 2, 3 and 4 provided with driving gears 5,6 and 7, of which gears 5 and 6 intermesh with each other and gears 6 and 7 mesh with a common driving gear 8 on the power shaft 9 havcarrying it into the die block 18, and a slide 19 slid'able upon the slide lvand carrying the punch 20. To actuate slide 16 shaft 4 is provided with an eccentric crank portion 21` Shaft 2, at the left in Fig. 1, actuates a" slide 27 carrying the crowning tool 2.8 and a slide 29 slidable upon slide 27 and carrying the piercing punch 30. Slide 27 carries two anti-friction rollers 31 which coperate with cams 32 on shaft 2 to advance said slide, and said slide is retracted either by the action of the blank entering the die or by the retreat of the piercing punch, as will appear.

Slide 29 is provided with a roller 33 cop` erating with the cam` 34 to advance said slide, and is retracted by the lobes 35, 36 on the sides of cam 34, which engage rollers 34a carried by a lever 37 fulcrumed in the frame, and whose forward end is provided with a projection 3 9'lying in advance of a shoulder 4() on the slide 29.

The lever 37 is a hollow forging or casting having a bottom 41 curved or sloping upward toward both ends and also provided with side walls 42 forming a chamber 43 which is filled with a suitable lubricant, such as a heavy oil. Cam 34 with its side lobes 35, 36 dips down into this oil reservoir at each revolution ofthe shaft and carries oil to the rotating shaft and cam parts at this end of the machine.

The slidev27 has .a depending portionv44 lying in front of a heavy bar 45 extending across the machine and backed by the pressure springs 46 which transmit the pressure to the stationary frame.

When the slide 27 is retracted or pushed back it encounters the bar 45 and then can only be moved back a 'short distance farther by compressing said springs.

In describing the operation of the machine we will assume that the slide 16 is fully re. tracted, that shaft 4 rotates in a counter clock-wise direction, Fig. 1, and that the bar of stock has just been advanced or fed one ,Step to abut or engage the Stop v.15.. One comvplete cycle of operation of the machine carries each of the shafts 2, 3 and 4 through exactly one revolution. I

During about the first 105O the indenters operate to nick the blank and withdraw, the slide' 16 in the meantime advancing toward the stock.' At about 130 to 135O the cut of tool- 17 shears the nicked blank from the bar and carries it into the die block against the end faces of the crowning tool 28 and piercing punch 30, which move back until the springs 46 have been compressed practically to the limit. This operation compresses the blank and partially produces the crown thereon.

At about 165o the cam 24 advances the punch 20 while at the same time cam 34 begins to advance the piercer 30. The two punches enter the center of the blank and thin the slug to about half the thickness of the blank until at about 1800 the nut has been full expanded into the die, pressed to shape and crowned. At this point the cross bar has reached its seat on the stationary frame sothat the cut-off tool is pressing the nut against a perfectly rigid backing. The piercer 30 is now moving forward and shears the slug out, carrying it back into the hollow cut-off tool against the retreating punch 20 to the full limit of the operation of cam 34 atfabout 1900, whereupon the piercer 30 is quickly withdrawn to get it out of the hot pierced blank and prevent said blank from shrinking, cooling or freezing upon the punch, as sometimes occurs with other machines not so arranged.

The piercer 30 is moved back or withdrawny from the blank by the cam 35 which oscillatesvthe lever' 37 Whose projection 39 pulls back the shoulder 40 of slide 29.

Cam 32 now comes into action, advancing slide 27 and causing the crowning tool to eject the formed nut from the die. Said nut can be kicked oif from the end of the crowning tool by a suitable kicker if desired, such for example as that shown and described in my prior application for nut blank forming machine filed Feb. 16, 1917 Ser. No. 149,120. Camv 36 then oscillates the lever V37 a second time and withdraws the slide 29 which is provided with a shoulder 47 cooperating with a shoulder 48 on slide 27 to produce a simultaneous retreat of slide 27. The cam 25 then advances the punch 20 to eject the slug from the cut-off tool 17, and said slug may be kicked off from the cut-oif tool by a suitable device, such for example as that shown in my prior application for nut machine filed April 6, 1917 Ser.4 No. 160,206. rThis completes the cycle of operations of the machine.

The quick withdrawal ofthe piercing punch prevents injury to the tools or machine, as there Ais no opportunity for the -blank to freeze to said tool and possibly break it off or jam the machine.V During the entire operation the cams are also revolving in a bath of oil in the chambered lever 37 and consequently are thoroughly lubricated.

Vhat I claim is 1. A nut machine, comprising a die block, reciprocating tools, a cam shaft for actuating said tools, and a lever operatively connecting said shaft and tools, said lever being arranged to serve as a reservoir for lubricant.

2. A nut machine, comprising a die block reciprocating tools, a cam shaft for actuating said tools, and a lever operatively connecting said shaft and tools, said lever'being arranged to serve as a reservoir for lubricant for said shaft.

3. A nut machine, comprising a die block,

reciprocating tools, a shaft, a lever opera-

Images