US1453751A

US1453751A - Razor-stropping machine

Info

Publication number: US1453751A
Application number: US435179A
Authority: US
Inventors: Ernest D Clark
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-01-05
Filing date: 1921-01-05
Publication date: 1923-05-01
Anticipated expiration: 1940-05-01

Description

May l, 1923. 1,453,75l

E. D. CLARK RAZOR STROPPING MACHINE Filed dan. 5, 1921 Patente-d May l, 1923.

ERNEST D. CLARK, or wonfonsirasn; MSSAGHUSETTS. .i

RAZOB-STROPPINGfiirAoEIivEl -4 AppncationmeaJanuary 5,-ie2if segiaifiiqiasgws. f

To all whom 'it-my'fcoaoefm; y

@Beit known thatL ERNEST D. CLARK,- a citizen: of the United States, residing at l/Vorcester, Ain the county 'ofWorcester-v and 5 Commonwealth of-Massachusetts, have invvented-l a 'new and 'useful Improvement in lRazor-Stropping aMachines, of which -1 the following,1together with the accompanying drawings, is a specification.'

Myinvention relates tov yrazor stropping machines of the type in whichl a blade holder is moved withrrespect to afstrop,l in order to 'sharpentlie edge ofa blade carriedbythe holder. i 15 Razorstrapping'A machines ofthis type vhave heretoforebeen constructed for moving the bladetransversely*across the face of the str-op, at the'asame time that the blade is moved'lon'gitudinally#along the strop. These movements have @been obtained v simultaneously V- 'by f 'various fmechanisms actuated by the` relati`v`e movement between the machine andrthestrop; "and such 'machines' havebeen successful liii-obtaining aE diagonal moveffm'ntof the fbla'de: with respect tothe strop "in imitation 'of ithe stroke employed when sharpening a blade hand. K.

f" Such @prior machines', howeverg'have been ffo'peto 'the' defect that'lthey"faily to imitate the [complete moveiiient'i whiclif'is imparted to abladewh'en'it is desi-redv tof'sharpen both 'sides thereof. -l It-is "fw-ell.:knownfthatj when yitis desired *tosharpen arazor,"or any `'other cutting blade,` 'that one edge isV first drawn "diagonallyHacrossithe strop f'orstone 'and then at the end of this strokelthefblade fis firsts'hift'edacros's the strop and then turned over 'before'theoth'er cutting-edge is` drawn diagonally across the strep; butinthe same *direction in which the blade'was first drawn.

- This cyclefof movementk iis always 'repeated z*in order to'insure' `Jchat/'the flow 'ofpmet'al which occurs' along 'the cutting 'edge wil-ll* al-v ways be iii-one fdirectionl Thus,fin`sharpen Ving a knifefthis';flowj'of metal is always in Vthedirection ofth'epoint y vInall'prior razor*stroppingfmachines, the

" movements .have been such that' the metaly is 'first drawn' in -"one"y direction on one side lof ythe, blade 'and then'in the lopposite direction on the-'i other'Y side "off the Vbla'degthus departing from the usual methodo-fstropping,.and

necessarilyfailing to obtainy the b'e'st results; "This" is dueto the 'fact 'that inprior' machines '`the'blade' zalways follows thesarnef diagonal path;l across the strop,i l y rections. y ...l i. Y ,1 l 1 i Bymy' invention propose tapfpwidyja a novel form1 'ofjrazor 'stropp'ing machinefyin whiclr the blade -isiiirst drawn diafggolially ,"lcrosl'slthe L solthatfthe metal: is drawn g in algiveny direction;andthemupon.reversving the blade it isffsof s'hifted ,with respctflo .the stropthat themetal isst'illvdrawn inthe same direction f vupon` the'y returna` diagonal lmovement rof theY blade with respect the i@ strop. 11n this way it possible to'obtainy a complete cycle of -movemenuclosely Y approxiinatingfthatlwhichpoccurs when a bladeffis 'sharpened 'by hand. Theseandother l advanstageousr features -Vof invention -wjill herein- .f

`after. more fully appeanfreference being@- had to Sarthe aecomp anying Vjdrawings-fin which# 'Egure leise a View fn-ndalfvatiwvi lmach-ine embodying.- myinvention'A the lend `plate being removed. 'i l 'Figure 2 is va'flongitlidinalY sectional walongithe -line 2-.f2, Eig. `l.l K

'view v niguna-isa yi'ewsimiiar to Eiga; Owl.

ing'fthefposition *ofthe parts-occupiedjwhen .the machine is;movedifingthempposite direc-L35.

' tionl froml that "shown 4in Fig. V1.v g j l Figure L)fist a longitudinal VAsectional. View 'along-the 1in@ 44=- 3 Fiese.

`Figures 5 to 85inclusive;are'diagranimatic views showing nthe f'movementsf --of ffthe; blade fr "holder @as fthe m'acl'iineA is-'moved--backfand forthwith relation tothefst'op. f

v'r Similar reference.' letters freferf lto "similar "parts in "the diiierent figures. t

@referring t@ riga-1; anagagithaiathihe ,comprises a frame lV withimV which are -jour,-

I isplrovided'at' itsends with openings? 5 `:for f receiving the-:strop k6 l' whichtpasses".v over the rollers 2 and 4 and,underl the roller, .='f\'1?he l holder' shaft 1'1"' isfjournallednmthe frafxii. 1A

immediately aboveand parallelft'lthe worm shaft Sgam@ isH connected teeth-@shaft of the roller 4 by fmeans of A"cran-lis VA"lQlfl-lffjoinedby a linkl. 'A'iblade" liolderi-l'ffis slidably keyed von the shaft 11 and is provided with a radially extending pin 16 that is adapted to engage in threads 17 provided on the left hand portion of theY worm shaft 8, as shown in Fig. 2. The blade holder 15 may be of any suitable form to receive aA blade 18.

When the frame 1 is moved upon the strop 6 in the direction indicated by the arrow in Fig. 1, the roller 4 is rotated in a clockwise direction, and the shaft 11 is rotated in the same direction to cause the blade 18 to engage the strop 6. This samemovement of the frame 1 also causes the roller 3 to be rotated and thereby drive the worm shaft 8 in the direction indicated by the arrow, through the

gears

9 and 10. As the pin 16 is in engagement with the thread 17 on the' shaft 8, the blade holder 15 will be moved from left to right, as indicated, as the frame 1 is moved upon the strop 6 in a direction away from the user. As the blade holder 115 is moved transversely it compresses a spring 19 surrounding the shaft 11, for a purpose to be hereinafter described. The movement of the blade holder 15 as the frame 1 lis .moved the full length of its stroke away from the user is indicated diagrammatically in Fig. 5, the spring 19 being shown as fully compressed at the vend of this stroke. v f

The frame 1 having reached the end of its stroke away from the user, the handle is then pulled in the opposite direction as indicated in Fig. 3. When this movement begins, the roller 4 is turned in a counterclockwise direction, as indicated, which causes the shaft 11 to be turned in the same direction to lift the blade 18 from the right hand portion ofthe strop 6, and to turn it over into engagement with the strop 6 on the opposite side of the shaft 11. As the blade holder 15 is turned over, the pin 16 is moved out of engagement with the threads 17 so thatv the compressed spring` 19 is free to shift the blade holder 15 back to its original position, as indicated by the arrow in Fig.l 6.

This shifting movement occurs almost instantaneously and before the blade holder 15 has been completely lturned fover by .the operation of the

cranks

12 and 13 and the llink 14. As the blade holder 15 returns to its original position, a pin 2O located'diametrically opposite to the pin 16 at the other end of the holder engages threads 21, provided at the right hand end of the shaft 8.

vThe threads 21 are ofv opposite pitch with respect` to the threads 17 which were previously engaged by the pin 16. The position of the blade holder 15 at the end of the shifting movement is shown diagrammati- `cally inl Fig. 7.

As the frame 1 is pulled in the direction of the user, as indicated by the arrow in Fig. 3, the blade 18 is held in engagement with the left hand portion of the strop by the tendency for the shaft 11 to be turned by the roller 4,1and at the same time, the shaft 8 is rotated in the opposite direction from that in which it was rotated before, as indicated by the arrow in Fig. 4. This rotation of the shaft 8 causes the blade holder 15 to again be shifted from left to rightas the frame 1 is pulled toward the user. rI` his is due to the fact that the threads 21 have a pitch opposite to the threads 17 and consequently the reversal of rotation of the shaft 8 causes shifting movement of the blade holder 15 in the same direction as before. The path of movement of the blade holder 15 as the frame 1 is moved from one end of its stroke toward the user, to the other, is indicated diagrammatically in Fig. 7, the spring 19 being shown as compressed at the end of this stroke. viously the blade holder 15 will again be shifted from right to left by the spring 1b as soon as the frame 1 is started on its return stroke away from the user.

From the foregoing, it is obvious that the' diagrammatically in Figs. 5 to 8, inclusive,

from which it appears that the blade is always moved diagonally across the strop 6 from left to right, as indicated by dotted -lines in the diagrams. Consequently the metal is always kdrawn in the same direction as rst one sideof the blade and then the other is presented to the strop, by the operation of the shifting device. It is obvious that the above described cycle of movements closely approximates the movement imparted to a blade that is being stropped by hand, and inview of the fact that the movement of the blade in my machine is always uniform, it is believed that even better results can be obtained by the use of my machine than 'by'r hand stropping, l

While `I am aware that various machines have heretofore been employed fo-r obtaining a diagonal movement of the blade across the strop, it is believed that my improved machine is the first to duplicate the actual movements of hand stropping, whereby the metal along the Cutting edge of the blade is always drawn in the same direction. While I have shown a specific arrangement of instrumentalities for. obtaining the above de-` for imparting transverse movement to said blade holder always iny the same direction across the strop as said holder is moved back and forth in engagement with the strop, whereby resulting diagonal movements of said holder on the strop are in different paths.

2. In a razor stropping machine, the combination with a strop, and a blade holder longitudinally movable thereon, of means for imparting transverse movement to said blade holder as it is moved back and forth on the strop, and further means for shifting the blade holder at the end of each longitudinal movement in a given direction across the strop, whereby resulting diagonal movements of said holder across the strop are always in the same direction.

.8. In a razor stropping machine, the combination with a strop and a blade holder longitudinally movable thereon, of means for imparting transverse movement to said blade holder as it is moved back and forth on the strop, and further means for simultaneously shifting said holder from one side of said strap to the other and turning over said blade holder at the end'of each longitudinal movement across the strop.

4. In a razor stropping machine, the combination with a strop, a blade holder movl.

able on said strop, and a rotatable shaft lprovided with threads of opposite Pitch for kimparting transverse movement t0 said strop as the latter is moved longitudinally thereon, of means for shifting the blade holder bodily across the strop and turning itrover at the end `of each longitudinal movement thereon to bring said projections into engagement with firstv the right hand and then the left hand threads on said shaft.

ERNEST D. CLARK.