US933299A - Rotary eraser. - Google Patents

Description

W. R. GARDNR.

ROTARY ERASYER. APPLICATION FILED 00T.5, 1908.

Patented Sept. 7, 1909.

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:errants PATENT onirica.

Ywnmntiam R. l GARDNER? or Los ANGELES, oALr-roRmA.'

.ROTARY simsen.

To dll whomit may concern: f I

Be it known that I, `W1LLIM R. GARDNER,

a citizen ofthe United States, vresiding at "Los ngeles, in the county of Los Angeles and State of California, have invented a new and useful Rotary Eraser, of which they lfollowing' is a specification.

This invention relates to orotary erasers, and the object of the invention is to produce .a rotary movement of the eraser whereby the operation of erasing maybe performed -more expeditiously than heretofore.

A further object is to restrict the erasing operation'of the -exact area to be erased, thereby making it possible to erase a single letter of a word without erasing other let-y ters of the word, and to increase the erasing `qualities of the eraser.

A further object. is to provide a stable or nonslipping support'for Contactin with the the area to e erased,

the process of erasing, the support preventing the instrument from s iftinoi which otherwisemight occur owing to the rapid rotation and pressure of the eraseragainst the paper.

The accompanying drawings illustrate the invention, and referring thereto Figure 1.'

is a side elevation of the device. liig. 2 is a longitudinal section through the device. Fig. 3 is a cross section on line ac3-ap, Fi 2. Fi 4 is across section on line actm4, Fig. .2.

he device comprises an outer barrel v1 and an inner barrel 2 which is slidable in theouterbarrel, thedower portion of the barrel .2 being lslightly reduced in diameter, 'as

shown Yin Fig. 2, to avoid friction when the two-'barrels are .telescoped The lower end of the inner :barrel-12l 1s -formed with vfour segmental Afeet 3, the edges of which are Iadapted to be pressed against the paper surrounding thearea to-be erased and form a 45 nonslipping support for the instrument dur'- ing the process of. erasing.

Screwedto the upper end of the barrel 1 isa cap v-4 to which isy secured a fork 5, the

'tines 6 of which extend down through the main barrel y1 and through two notches 7 formed in the head 8 ofthe barrel 2, the head 8 having a central .perforation with which the notches 7 communicate. A shaft 9 is arranged with its upper end rotatably mounted in the perforated head 8, while the lower end of shaft 9 is grooved at 10 andv .rpeoiotion d! ALetters "Patent,

Applioationled october 5,1908. Serial No.,456,349.

flvatentell Sept. 7,1909.

' journaled in a plate l1 slidable within the ,barrel 2. A chuck or eraser holder 12 is carried on the lower end of the shaft 9, and

the eraser 13 is supported by the holder 12.

flhe shaft 9 has a spiral roove 14 which is engaged by two inward y pro'ectinfr lugs 15 formed on the lower ends o the fork 5. A coil com ression spring 16 is located in the barrel 1 between t e cap 4r and head 8, while a-coil tension sprin 17 is located in the barrel 2, the upper en of spring 17 being secured to the iead 8 andthe lower end being secured to the plate 11. It will be oliserved that the tendency of the sprin 17 is to withdraw or lift the shaft 9. ig. 2 shows the minimum contraction of sprin 1.17, the shaft 9 and eraser 13 being retracte to the farthest point they occupy normally,

at which time the eraser 13 lies housed withinthe lower end of the barrel 2.

In operation the legs 3 of the instrument are placedover the space to be erased, then by pressing down the barrel 1 the lugs 15of thefork 5 ride down the spirally ooved shaft 9 and thus cause the shaft an eraser to rotate. lThis downward movement of lugs 15 in the groove 14 exerts a' downward.

pressure on the shaft 9 in addition to the rotary pressure thereon., and this downward pressure is suiliclent to overcome the spring 17 and force the shaft 14 downward until the eraser 13 makes contact with the paper and the rotation of the eraser performs the The s ring 17 prevents the eraser 13 from being orced a ainst the paper with too great a pressure an thus obviates tearing of the paper or undue abrasion thereof. One of the most important reasons foi' the employment of the spring 17 is this: The 1e s 3, in order to prevent the barrel 2 from `s ipping, must remain in contact with the paper during the erasing operation, and this contact is secured by the downward pressure of the upper spring 16 which is compressed when the barrel l is moved down. It is obvious that while the legs 3 are thus stationary on the paper it becomes necessary forthe eraser 13 to be capable of a longitudinal movement, even though slight, with respect to the surface of the a er, because the eraser is constructed usua ly of yielding material and it will necessarily be pressed fagainstthe paper with varying degrees of pressure. Thus to provideifor this move- -ment of the eraser, the shaft 9 is permitted a longitudinal movement within the barrel 2 A J Q from the "oint shown 1n Fig. 2 to a point at which't e tip of the eraser 1s substantially flush with the ends of the legs 3, and to retract the eraser and shaft 9 the spring 17 is employed. Thus durlng the downward movement of barrel 1 sprin 16 is contracted,

and spring 17 is ex ande as the plate 11 slides down in barre 2, and as soon as pressure of the linger is removed from barrel 1, the spring 16 forces the barrel 1 upward and at the same time spring 17 pulls up the shaft 9, bringing the parts into lnormal. position shown in Fig. 2.

What I claim is 1. An outer barrel, an inner barrel slidable therein, a Vspirally grooved shaft with' its upper end rotatably a'nd slidably mounted in the end of the innerf barrel, a. plate slidable in the inner barrel in which plate thelower end of the shaft is ]ournaled, 'a

holder for van eraser on the lower end of said lshaft, a fork connected at its upper end to the outer barrel and extendin through the head of the inner barrel,'sai Afork havin lugs which engage the spirally groove shaft, a coil vcompression spring in the. outer barrel, and a coil tension springwithin the inner barrel, one end of the latter spring being* attached to thehead of the inner barrel and the other end attached to said slidable plate. Y'

2. An outer barrel, an inner barrel slidable therein, a spirally-'grooved shaft with its upper end rotatably and slidably mount ed in the end ofthe .inner barrel, a plate slidable in the inner barrel in'which plate the lower end of the'shaft is journaled, a holder for an eraseron the lower end of said shaft, a fork connected at its upper end ,to the' outer barrel and extendm through the head of the inner barrel, said fork having `lugs which engage` the spirally 'grooved shaft, a. coil compresslon spring 1n the outer barrel, and a coil tension s ring within the inner barrel, one end of the atter spring being attached to the head of the'in- `ner barrel and the other end attached to said slida'bley plate, the lower end of the inner barrel projecting/below the eraserv holder.

' '3.- A pair of telescopic barrels, a spirally grooved shaft rotatably mounted in one bark,rel and having a limited lon itudinal move-l ment therein, means carrie b the other barrel for engaging the spira ly grooved shaft to impart rotation thereto when the barrels are telescoped, a holder carried on vthe lower end of said shaft, a coil compression s ring for extendin said'barrels, and

a coi tension s ring or vretracting said shaft and control ing ltslongitudinal move- 1 fment.`-

4Q'A'pair `of' telescopic barrels, a ca .screwed Ito the outer barrel, a fork secure to the cap, the head of the inner barrel being perforated and having two notches at the perforation through which the tlnes of sald fork project, a spirally grooved shaft extending through the perforated head of the inner barrel and engaged by the tines of said fork for the rotation of the shaft, a

slidable plate in the inner barrel in which the lower end of the shaft is rotatablyI mounted, an eraser holder on the lower end extending through the perforated head of vthe inner barrel and engaged by the tines of said fork, for the rotation of the shaft, a slidable plate inthe inner barrel in whlch the lower end of the shaft is rotatably mounted, a compression spring between said cap and the head of the inner barrel, a tension spring connected at one end to said plate and at the other end to the head of the 4to the lower end of said shaft below said late, said inner tube having feet which pro- ]ect below said holder. 6;- A rotary eraser 'comprising a pair of telescopic members, the lower end of the -lower memberjbeing adapted to be pressed against the pa er and forming 'a non-sli pmg support orthe instrument, a spiral y groovedl shaft .within said members mounted to rotate and. capable of longitudinal movement `therein, an eraser carried on. the lower end of said shaft, and means engagin the grooved shaft and operating by the te escopical movement of the two members to operate the eraser.

` 7. A rotary eraser comprising a tube, the lower end of which is adapted to be ressed against the fpa er and forma non-s ipping support for t e instrument, a splrally groovedg'shaft within said tubev mounted to rotate and capable of lon 'tudinal move- .ment therein, an eraser on t e lower end of said shaftyand means slidable relativel vto said tube' and engaging the grooveds aft foroperating the same;

In testimony whereof, I have hereunto set mty hand at Los Angeles, Cal., this 21st day o September 1908.

- WILLIAM R. GARDNER.

cIn presence 01?--v vl G. T. HACKLEY,

- FRNK L. A. GRAHAM;

linner barrel, and an eraser holder secured

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