US1748363A

US1748363A - Metal plating

Info

Publication number: US1748363A
Application number: US39979A
Authority: US
Inventors: Jr Charles L Peirce
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-05-27
Filing date: 1925-06-27
Publication date: 1930-02-25
Anticipated expiration: 1947-02-25

Description

Feb. 2 5, 1930. c. L. PEIRCE, JR

METAL FLATING Original Filed May 27. 1922 2 Sheets-Sheet wlrlvsssss 4. wwzaw Feb. 25, 1930.

WITNESSES c; L. PEIRCE, JR

METAL PLATING Original Filed May 27. 1922 g /fiw W Wm,

2 Sheets -Sheet 2 INVE/VTOK Patented 7 Feb. 25, 1930 v CHARLES Lg PE IBCE, JR OE PITTSBURGH, PENNSYLVANIA METALT'PLATING Original application filed 'May 27,1922,

This invention relates to a new and improved apparatus for metal coating for such g articles as bolts, rods, screws, changers,

brackets, etc., and-1s fl-CllVlSlOIl of my pre 5 viously filed applicationSerial No.

. 564,273, filed May 27,1922.

' An object of the invention is to produce a a number of separate articles may be simulnew and improved apparatus for metalcoating which maybe employed in connection with galvanlzing and) s milar processes where it is important to minimize the ex penseofthe metalcoatingoperation. l

A further object is to'produce an improved 1 apparatus formetal coating so constructed '15 andarranged as to insure a complete and uniform-coating on each coated article and which, at the same time, avoids waste ofthe coating material. gAfurther object is 'to'produce anapparatus formetal coatingfwhich is simple and cheap tomanufacture and assemble, rugged in construction andrapid in operation. I

These and other objects are attained by means of this invention, one embodiment of which is illustrated in the drawings accompanying and forming a part hereof,in-which Figure'l is a diagrammatic view illustrating anapparatusfconstructed ln accordancewith i I rack. The separate articles are preferably one forin ofthis invention. 1

' Fig. Q isan enlarged view of a support rack 'shofwnin connection with associated appa ratus.

'85 Fig. 4 is a side elevation'of the rack shown is a plan view of the rack shown in in connection with means for simultaneously raising it off arotating element'and decreas- -1ng its speed of rotation.

Articles to be galvanized are ordinarily f submerged'in a bath of molten galvanizing metal jand are allowed to remain-"in the bath unti l 'the coating metal adheres theretojby alloyingv with the 'surface metal thereof.

. The article is then removed from the bath and someeifort is made to dislodge excess coating metal. therefrom; I After the excess 1'50 ployed for galvanizing and removing excess Serial No. 564,273. Divided and this application filed June 27, 1925. Serial No. 39,979.

coating material from the coated articles, but so far'as I know, none of the machines now in use is entirely satisfactory, since they do not give uniform results in connection with relatively large articles such as screws, bolts, hooks, hangers, brackets and the like.

One of the features of my invention is that taneously coated and then simultaneously subjected to centrifugal action in such a way that the excess metal on all parts of each article is subjected to substantially the same dislodging force with the result that each article is coated with a thin and uniform covering of the coating metal. Another feature of my invention is that the articles are almost immediately accelerated to the desired rotational speedafter they are removed from the bath of molten metal and consequently are quickly subjected to sufficient centrifugal force to' dislodge the excess coating'material before it has cooled sufficiently to resist the dislodging force. I v

In carrying out my invention, I.empl0y a frameor rack 6 which is provided with separate means, such as apertures or a recess for holding each article to be coated in a fixedposition with relation to the axis of the so'mounted on the frame that their major axes extend substantially-parallel to the axis of theframe.

The frame, with the articles in place on it, is then immersed in a bath of molten metal shown diagrammatically at 5 in Fig. 1'. After the articles have remained in the bath a sufficient period to insure proper coating,- the rack, with the articles in place on'it, is removed'fromthe bath and is moved into clutching engagement with a continuously rotating spindle in such a way that it is almost instantaneously accelerated to the speed oftherotating spindle and is causedto rotate about its axis at a speed suificient to dislodge the excess coating material from each article on" the rack. While thea-rti'cles are subjected to this whirling action of the spindle, they are retained in fixed relation to the axis of rotation of the rack and are so located on the rack that the dislodging force occasioned by the rotationis substanment, a uniform coating of all the articles is CH bu revolve with the spindle.

this, the cone performs to-some extentgthe obtained and the coating on each article is substantially uniform over the-entire article,

As shown in the drawings, the rack '63 for the articles to be coated consists of two spaced plates 7, each provided 'withja number of article-receiving apertures 8 arranged syminetricallyaround the axis of the rack; The. plates are located one abovethe other and eachaapertu-re-ti in the upper plate is aligned with a similar aperture in the lower plate. 1 he plates aresecured to and are spaced by a hanger?) which'is bent to form a loop-10 adapted to be'engaged by a supporting hook 13. The hook 13'is preferably a ball-bearing swivel hook, assh-own, or is otherwise so constructed that the rack may turn' freely while supported by it. Any suitable means may be employed for lifting :and movingthe' rack but, as illustrated in Fig.1, I employ trolley 14 operating on a track 15 and a tackle l'fi secured to the trolley for raising and lowering the rack.- 1

The articles to be ocated are located in the recessesaround the axis of the-rack as shown iii-Figs. :1,'2-.and 4. The rack is then engaged by the hook 13 and is moved to position over abathof molten metal. The tackle 16 and the trolley 14 may be-employedinso moving the rack and the tackle may be employed in lowering therack into the bath of metal.

'- After the articles to be coated have been subjected to the bath, the rack is again lifted sothat the articles clear the surface of the bath and the rack is moved by means of the trolleyandthe supportingtackle to position above a continually rotating spindle 1'7. As shownrin Fig. 1; the spindle is located a convenient position between the'bath '5 and a tank 18 adapted to contain o water. The

spindlestands vertically and is provided, at

itsupperend with a cone 19'. which isrigid-ly secured theretoandlis adapted to engage the 7 rank.- .For this purpose the two plates ofgthe rac-kare provided with axially aligned'aper 'tures of such relative diameters that their edges will simultaneously engage the cone 1 9 as therack is [moved downwardly over it.

The engagement 'of the cone 19iwith the die 17 and [consequently causes the rack to In'addit-ion -to function of "oneelement of a friction'clutch, whereas the contacting edgesof the rack-perform the gfunction of theIco-operatin'g elementfof sucha clutchwith the result that o the rack is quickly accelerated to the ?speed of thespindle. The rotation of the rack and [the articles-carried it disledges{theexeess nmjetal from the articles In order to pret en-it this ,hot -meta-lbeing thrown about,

I employ. a safety shield 21 which may be lowered from a point above so that it surrounds the rack while it is being rotated on the spindle. As shown,the shield may be supported by means of ropes and pulleys from the trolley 15.

In the apparatus illustrated; the spindle is driven by a motor 22 through the agency of beveledgears 23. The spindle is mounted A in a stationary form 24 and" is preferably -prov-ided with a weighted wheel such as a fly wheel 25 for the purpose ofabsorbing the shock when the rack (is mounted on or' removedfrom the cone 19. As shown in Fig.

1, the frame is provided with a stationary table 26, on which theiprotectii' escreen may rest during the whirling'o'f the rack. i

stationary pivot and is bifurcated atone end for the purpose of straddling-the cone:

The forks ofthe bifurcated end are .pivotally secured to a ring'QS which :is adapted to be i moved upwardly by the lever so that its upper edge engages andl'ifts the rack 6 from the cone. :It will be apparent thattheengagement :of the ring with'the rack'willim-' part a braking action'to the rackjand will thereforeltend. to stop the rotating motion ofthe rack as soon as the rack moves out of engagement with the cone. 7

- Afterthe excess metal has been {removed fromthe coated articles carried by the rack the rack with ,the articles in place on it is dropped into the bath. 18 of the cooling water. The book '13 and itsassociated su porting device may be j employed in moving the rack from the spindle 17 and into the bath 18. i Where the brake -28 islnotemployed 'the'support and the articlesare plunged into a bath o-f'cooling'liquid for the purpose of checking c'lesj 7 While I have described-and illustrated but the rotation and cooling the farti one embodiment of my invention, it will be 7 apparent that various changes, additions,

omissions and substitutions may be made in Ii the apparatus illustrated without departing .Nhat I claim as my'inveirtionisz from the spirit andscape-0f the invention 7 a set forth bythe appended claims. rack-operatively couples the rack to-the spin $1. In an apparatus for 'coa ting artieles, a

rotary s'pindleohavi-ng circular engaging faces, frame for securely holding a plu; wrality-o-f articles t ojbe coated and adapted to 'be rotated by -said spindle,'fan overhead structure including a'swivel tori-holding said frame movingit from a coating-bathint-o engagement with said c rcular faces 0f said spindle so as tosubjeet the coated arltij cles to centrifugahforce for 'riislo'dging ex cess coating material 5anl-a-shield adapted to surround said fra-me and supported for' 20 ing a conical clutch face, a frame for securely holding articles to be coated and havvertical'movement from said overhead structure. V

2 In an apparatus for coating articles, a rotary spindle, a frame for securely holding t plurality of articles to be coated and 7 adapted tobe rotated byengagement with said spindle, and means for raising said frame'away from said spindle and stopping "the rotation of said frame.

3. In an apparatus for coating articles, a

rotary spindle, a frame for securely holding a plurality of. articles to be coated and adapted to be rotated by engagement With j said spindle, a ring movably mounted adj a- :ent sai d spindle and means for moving said rmg into engagement with sa1d frame so as to lift thesame away from said spindle and v 7 stop the rotation of said frame.

4. In an apparatus for coating articles, a "otary spindle, having a tapered end forming perforations adapted to receive and fric- 1 tionally engage the conical face of said spindle.

In testimony whereof, I have hereunto subscribed my name this 26th day of June,

CHARLES L. PEIRCE, JR.