US2511700A - Method of grinding flat coil spring bands and a work holder therefor - Google Patents

Description

June 13, 1950 H. J. DUESTER 2,511,700

METHOD OF GRINDING FLAT COIL SPRING BANDS AND A WORK HOLDER THEREFOR Filed Aug. 30, 1948 4 Sheets-Sheet l flan fiat 4.

gwuwwtov Ha: I .0055 TEE ATTOR N EY June 13, 1950 H. J. DUESTER 2,511,700

' METHOD OF GRINDING FLAT COIL SPRING BANDS AND A WORK HOLDER THEREFOR Filed Aug. 30, 1948 4 Sheets-Sheet 2 mmvrozz. flew; .7. 0055 75K June 13, 1950 H. J. DUESTER 2,511,700

METHOD OF GRINDING FLAT 0011. SPRING BANDS AND A WORK HOLDER THEREFOR 4 Sheets-Sheet 3 Filed Aug. 30, 1948 INVENTOR.

flaw: .7. flaw-r512 Y June 13, 1950 H. J. DUESTER 2,511,700

RINDING F MET D OF G LAT COIL SPRING B S AND A WORK HOLDER THEREFOR Filed Aug. 30, 1.948 4 Sheets-Sheet 4 mmvroR.

4: I DOA-675B BY fiat /2, 7 W

Patented June 13, 1950 -METHOD-OF GRINDING FLA'I' G011?SPRING BANDS-ANDAKWORK HOLDER THEREFORE} to Hans hn estenQ ia o,- lle s imo ic l imselt Q andJohnMajor, Chicago; Ill. Application August 30, 19t8,"Serial:N o. 46,736:

wands. (c1. 51:42.17.) f

My invention relates: to. a n w: and im rcv sl method of grinding-mat coil: sprin bands an re workzholder therefor-r rinvention relates; more, particul r e a the method of grinding .flatcoil; spring handset. he typeused. for ornamental purpq i fi such as ,3 tensibiezbands for. watchybrae l s or im la a ticles, choker necklaces or bracelets Extensible wristwatch bandsaand hra eletsn this typehave come into. popular ruse-v nr'l he t few years, the; same haringradt n a a over th r ypes of bracelets. particullr c due 1505 their ease of attachment, orremoyal andpartiallysdue to decorative features which can be embodied therein.

The method which I-have devised and the work holder which I have provided therefor are adapted to be used in providing decorative grooves of various types in bands of this ,description, the grooves serving to enhance the ap pearance of the extensible spring bands.

The principal object of the present invention is to provide a new and improved methodof grinding decorative grooves in coiled spring bands of the type described.

A further object of the invention-is to provide a new and improved work holder or fixture for holding flat bands of this type during the grindingoperation thereon.

A further object of the invention .is to provide an improved work holder or fixture of the type described which is capable of holding one or more coils of the extensible band in a lowered position, depressed below the surface of others sethat alternate coils of the band may be ground, thereby creating varied decorative surfaceconfigurations in the complete band.

A further object of the invention'is to provide a work holder or fixture of the type described by which such decorative grinding can be rapidly and efiiciently done in a minimum of time and with such accuracy that volume production of decorative bands can be accomplished.

Other objects and advantages will be more apparent from the following description wherein reference is had to the accompanying drawings, upon which 7 Fig. 1 is an enlarged fragmentary view of a portion of a flat coiled spring band showing a plurality oi parallel grooves in alternate coilsQof h and;

Fig. 2 is a cross-sectional view taken on the line 22.,of Fig. 1 showing the grinding of vthe grooves in one of the coils;

3 a. sim a tres ctiona v ewaken s p me e indin a ls; mer ed a men r -plan .vi w 1E=-9e r n d ee dee mtive h sp teand; l eate F s 5 :i a c es r ecticna a nr nwthe i e 1-5 of} i t aw n the a ner n? w ich e oov r n-e -emuedr 1 -v 6 a i lar: s tion sw aken Onrthr r 15-1 11 s e lnes hemamer i whi h t na v smcv sa e roue F a is rlanr iq qi he x reeo week mild r. i .=-Wh the xien i mil spr ne aes 9 be el -i r r nd ng r is re nerative ofrthe inin arh h. .=h;; mn ,e

F -r 45. ide e erat qna ie 2 e. we k helq r r fixer- "Fig.1 9 15 18. cross-sectional viewthereof .take onrthe ueee-e at F s- 8;:

Fie.- 10. is; an. enlarged. fra mentary sectional view; showing a: portion or the. mechanism shown in Fig. 9;

Fig;.11 is artragmentarp plan view thereof y and Figrlzis: a similar fragmentary plan view showing avmodified; construction wherein several par.-

-surfaces ;of tlfiec'oils [2, 14 eta, have surface 0 on a, full sizeband,;which--isordinarilyotan grooves 18, the {grooves being staggered r so that inch'wide} the pl'a'cementor-the grooves as shown in the enlarged -grooves -Figs.- 1 to 3 inclusive, give the appeararice of a-chain design.

"The grooves arernade in the top surfaces oj e xier ie' @0 o wrlvolutipns. by r n in whe Gm nted e a ie a dr in a manner thatfiswell-lmownin the art.

In. h m nq ln zsrin ice w i I abor t q .es r he;al i pfii s roev 15 are r Place iat sshereate se ls it" it, etc, t e wards: thus z.q.. te heme hs d do n dur iathis rindin qneratlq i: I ar di ieree $e t r$ which will 1) ese n tly be pl ed th .0

against the-forward wall. ,of the post.v

it are ground in the top surfaces of the convolutions l2, l4, etc.

In Figs. 4 to 6 I have shown how the same method of grinding may be utilized where variations in the design or pattern are sought. For example, in the spring band 20 shown in Fig. 4 and consisting of the convolutions 2|, 22, 23, 24, etc., each of the convolutions 2|, 23, etc. has a comparatively wide fiat groove 25'ground therein by the grinding wheel G, the alternate convolutions 22, 24, etc. being held down during this grinding operation and the tconvolutions 22, 24,

etc. having the elongatedugroove 2'! ground I therein by the grinding wheel in ,a diflerent setting when the alternate convolutions 2|. 23,,etc.

are being held down.

From the above description of two diiferent throughout their'leng'th. I mount a pair of suspension and eliminating -jaws '38" and 40 on the top of the guide blocks 34 and 36 respectively, the same being fixedly held in position by suitable holder on the arbor in the position shown in Figs. '7 and 9 and the operating lever 60 has been swung to the right (Fig. 7), the wedge lifter 48 will be moved forward and the separate convolutions of the band will take the position shown in Fig. 9 and enlarged in Fig. 10. Referring to Fig. 10, it will be noticed that the depressed convolutions l2 are wedged between the top surface of the lining arbor I0 and the suspension and eliminating jaws 38 and 40.

' The jaws, as best shown in Fig. 11, have alternate slots 82 and teeth 84, the unlowered coils or convolutions reposing in the slots 82 and the lowered convolutions l2, l4, etc. being jammed by the teeth 84 downwardly against the top of the lining arbor 10. In this condition the bottom portions of the coils or convolutions rest at screw members 42." I providea wedge 44'posi- I tioned for up and down movement in the space between the guide blocks, the wedge being generally rectangular in shape, bu'thaving a top surface tapered from'the center outwardly to both edges at approximately 5. Means for raising or lowering the wedge block may comprise the lifter member 48 which is also guided between the blocks 34 and 36 and has the tapered surface 50 which bears against the lowered tapered surface 52 of the wedge block.

Any lateral movement-of the wedge blockbetween the guide'blocks 34 and 36 is prevented in the back end of the fixture by'the end post member 54 which extends across the face of the ends of the guide blocks and 36- and at the front end of the fixture by a fastener block58 which is fastened to the front endiof block 34 and has a finger portion 58 extending across the end of the wedge block 44 at its frontend.

Means for moving the wedge lifter 48 back and forth may comprise thepivoted lever 60 having a head 62 mounted-for rotation on a pin. fastened to the base-30." The head 82;mayhave an elongated slot 66 adapted to receive an uprigh pin 68 on the end of the wedge lifter 48. I y

To fixedly secure-an extensible chainbandB in position in the work holderso that alternate convolutions or coils may beraised for grinding and others depressed, I place the band on a lining arbor 10 shown in perspective in Fig. 'I-A. The liner 10 is a comparativelylong paralleledged strap having a fiat upper surface 'l2.and a lower surface 14, which surface tapers upwardly from the center tobothedges at. approximately 2 The end ofthelining'arborhas seemicircular groove 16 which, when thearbor .vvitha band mounted thereon is extended into the work holder, engages the..stop ,pin 18 mountedrupon the end post member 54;,thefband' itself abutting when a band has been insertedinto th'e work an angle so that alternate convolutions rest against the tapered top of the wedge block 44 and the tapered lower side of the lining arbor 10. Thus it can be seen that alternate convolutions of the coiled spring band are held depressed below the depth at which grinding of the decorative grooves is desired, the grinding wheels G mounted upon a suitable driven shaft which may now be moved back and forth across the top of the entire band, thus making the desired grooves in the top surfaces of alternate convolutions.

After the operation has been completed, the

operating lever may be moved clockwise to release the wedge block, the lining arbor may be withdrawn with the band and the next band inserted for the same operation.

" From the above and foregoin description it will be apparent to those skilled in the art that I have provided a comparatively simple yet efiicient and accurate method of grinding decorative grooves of the type described as well as a highly efficient and accurate mechanism for carrying out the method. By the use of this method and process, bands of this type can be accurately and quickly ground without injuring the -tensile strength of the material of which the bands are constructed or disfiguring or in any way interfering with the function of the same as they would function if the grinding operation had not taken place.

From the foregoing description itwill be obvious that by a variance in the construction of the suspension and eliminating jaws different designs may be produced with the same method and by the use of the same mechanism. For example, the teeth and spaces may be so defined that two or three coils together will be depressed, permitting alternate groups of more than one coil to be grooved with the same design, and then the grooved convolutions may be depressed to permit a different design in the unground convolutions. I

While I have illustrated and described a specific embodiment of the invention and one other use for the same, it will be apparent to those skilled in 'the' art thatchanges and modifications may be made in the exact details shown and I do not wish to be limited in any particular; rather what I desire to secure and protect by Letters Patent of the United States is:

1. The method of decorating flat extensible spring coils which comprises inserting a rigid filler strip into the coil partially to fill and rigidify the coil, applying upward pressure to the assembled coil and filler. strip from below the assembly while simultaneously firmly resisting such pressure from aboveevery other convolution of the coil along the edges of the coil so that only the intermediate alternate convolutions are raised above said first mentioned convolutions by the upward pressure and then cutting patterns in the raised exposed fiat faces of the intermediate alternate convolutions, and then removing the filler strip.

2. The method of decorating flat extensible spring coils which comprises inserting a rigid filler strip into the coil partially to fill and rigidify the coil, applying upward pressure to the assembled coil and filler strip from below the assembly while simultaneously firmly resisting such pressure from above one or more spaced convolutions of the coil along the edges of the coil so that only the intermediate alternate convolutions between the aforementioned one or more convolutions are raised above said first mentioned spaced convolutions by the upward pressure and then cutting patterns in the raised exposed flat faces of the intermediate alternate convolutions, and then removing the filler strip.

3. A work holder for flat coiled springs comprising a base, spaced parallel walled guide blocks mounted on said base, a pair of similarly shaped horizontally disposed jaw members fixedly mounted on said guide blocks, each of said jaw members having a row of spaced diagonally directed teeth on one side wall, the jaw members so arranged on said guide blocks that the rows of teeth are opposed and directed at an angle toward each other and a tapered channel is formed between said jaw members, a wedge having parallel side walls mounted between said guide blocks, a wedge lifter slidably mounted below said wedge, said wedge lifter adapted when moved in a lateral direction to raise said wedge toward said rows of spaced teeth, a fiat coiled spring positioned on said wedge, an elongated arbor telescopically mounted therein, said coiled spring adapted to be placed on said wedge to present alternate coils of said band to the opposed rows of teeth to hold them against movement while adjacent coils are raised for grinding by movement of said wedge lifter.

4. A work holder for flat coiled springs comprising a base, spaced parallel walled guide blocks mounted on said base, a pair of similarly shaped horizontally disposed jaw members fixedly mounted on said guide blocks, each of said jaw members having a row of spaced diagonally directed teeth on one side wall, the jaw members so arranged on said guide blocks that the rows of teeth are opposed and directed at an angle toward each other and a tapered channel is formed between said jaw members, a wedge having parallel side walls mounted between said guide blocks, a wedge lifter slidably mounted below said wedge, said wedge lifter adapted when moved in a lateral direction to raise said wedge toward said rows of spaced teeth, a fiat coiled spring positioned on said wedge, an elongated arbor telescopically mounted therein, said coiled spring adapted to be placed on said wedge to present alternate coils of said band to the opposed rows of teeth to hold them against movement while adjacent coils are raised for grinding by movement of said wedge lifter, said wedge having a medial peak in its upper surface and said arbor being generally rectangular in cross-section and having a medial peak in its bottom surface whereby the bottom legs of alternate coils of the band are rigidly clamped between the tapered surfaces of the top of said wedge and the bottom of said arbor to present alternate coils of said spring raised above the rest of the coils.

HANS J. DUESTER.

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

UNITED STATES PATENTS Number Name Date 638,835 Coran Dec. 12, 1899 1,335,247 Lask Mar. 30, 1920 1,779,053 Stoner Oct. 21, 1930 1,847,577 Thompson Mar. 1, 1932 1,904,274 Crowley Apr. 18, 1933 1,935,147 Drexler Nov. 14, 1933 1,952,415 Brownlee Mar. 27, 1934 1,953,370 Starkey Apr. 3, 1934 1,954,970 Wilson Apr. 17, 1934 2,019,398 Desagnat Oct. 29, 1935 2,221,885 Smithe et al. Nov. 19, 1940 2,244,223 Smithe et a1. June 3, 1941 2,424,924 Chernow July 29, 1947 2,434,383 Benjamin Jan. 13, 1948

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