US1790754A

US1790754A - Hehdbbsoir w

Info

Publication number: US1790754A
Authority: US
Publication date: 1931-02-03
Anticipated expiration: 1948-02-03

Description

Feb. 3, 1931. H. w. KNOTT 1,190,754

BLADE SHARPENER @riginal Filed Feb. 25, 1926 Patented Feb. 3, 1931 UNITED STATES 'HENDERSON W. XN OTT, 0l' VALPARAISO, DTDIANA BLADE BHABPENEB Application illed February 23, 1886, Serial Io. 88,985. Renewed December 12, 1828.

This invention relates to the type of blade Sharpeners in which a sharpening action is effected by magnetic action and more par, ticularl pertains to a device for sharpening razor b ades ofthe character set forth in my co-pending ap lication for United States Letters Patent led April 30, 1925, Serial No. 26939.

The primary object of the present invenl tion is to provide an effective means for holding a blade to be sharpened in such relation to the poles of amagnet that the action of the latter will serve to straighten out and align the fine or microscopic teeth composing the cutting edge of the blade which have been bent out of alignment, and whereby magnetic lines of force emanating from the magnet will effect a sharpening action on the 'cutting edge of the blade.

further object is to provide a device of the above character which is especially applicable for use in holding safety razor blades of the double cutting edge type and which is so constructed that the blade may be readily and accurately positioned within the magnetic eld and easily removed therefrom.

A further object is to provide a means whereby the blade will be held under tension or pressure while being subjected to the action of a magnet so. as to effect straightening of the blade in event it be curved or Warped.

With the foregoing objects in view to-` gether with such other objects and advantages as ma subsequently appear, the invention resi es generally in the provision of a magnet having a pair of opposed magnetic poles, together with a housing or casing for the magnet tted with a demountable slide for the reception of a blade to be sharpened, and in so constructiong the housing and slide as to facilitate disposing the slide in such position in the casing as to properly place the blade thereon in close proximity but in spaced relation to the opposed magnet poles. The invention further resides in the parts and in the combination, construction and arrangement of parts hereinafter described and claimed and illustrated by way of example in the accompanying drawings, in which Fig. 1 is a plan view of the device;

Fig. 2 is a view in cross section as seen on the line 2-2 of Fig. 1;

Fig. 3 is a perspective view of the device with portions broken away to illustrate constructive details thereof;

Fig. 4 is an end view;

Fig. 5 is aA perspective of the slide as re- 00 moved;

Fig. 6 is a perspective view illustrating a modified construction of the slide.

Referring to the drawings more speciicaL ly, 10 indicatesv generally a magnet which 55 may be of any suitable construction but which essentially embodies a pair of

opposed poles

11 and 12 suitably spaced apart and of elongated form so as to extend throughout the length of the blade B interposed therebetween. The magnet is here shown as comprisin a permanent ma net of general U- shape form with the

po e members

11 and 12 Cprojecting inwardly from le members 13 an 14 connected together by a ase 15. The 75 magnet 10, however, may comprise an electro-magnet of conventional form having opposed poles arranged as here shown.

Encasing the magnet i0 is a housing 16 embodying a top wall 17, side Walls 18 and 80 19 and

end walls

20 and 21. The magnet is arranged within the housing 16 with the

poles

11 and 12 positioned adjacent the underside of the top Wall 17 and with the leg members 13 and 14 of the magnet abutting against 85 the side walls 18 and 19. After positionin the magnet in the housing, a bottom pane 22 is aixed at its margin to the marginal edges of the side and end walls thus completely encasing the magnet within the housing. The top wall 17 of the housing is formed with a longitudinally extending slot 23 which opens at one end to a slot 24 formed in the end wall 20 and extending between the end walls 2O and 21 beneath the slot 23 95 is a fixed panel having downturned side flanges a and b, which panel is spaced below and extends parallel with the top panel 17 of the housing and is located between the opposed end faces of the magnet poles 11 100 and 12 in spaced relation to the latter. The lower margin of the slot 2A inthe end wall 20jextends substantially flush with the vtop surface of the panel 25 and is formed with a pair of spaced notches c and d extending contigigus' to the outer faces of the lianges a an Formed on the side margins of theslot 23 are downwardly inclined tongues e, f, g and h, respectively and preferably formed integral therewit is a pair of spaced parallel

elongated plates

26 and 27 which extend close to t e upper face of the panel 25, and by reason of their mountin on the tongues c, f, g and h are yieldably eld against movement perpendicularly to the plate 25.

Means are provided for holding a blade to .be sharpened and for positioning the blade between the panel 25 and the

plates

26 and 27 with the cutting edges of the blades disposed contiguous to but not touching the opposed faces of the magnet poles l1 and l2. This means is here shown as comprising a brass plate 28 having downturned side flanges e' and j and an upturned end ange la; the plate 28 being adapted to be inserted endwise through the slot to a position between the panel 25 and the plates 26 and 2f? with the flanges 2, y' of the late 28 extending along the outer faces cip the marginal flanges a and I) of the panel 25, as particularly shown in Fig. 2. The side Hanges e' and j on the plate 28 co-operate with the sides of the panel 25 to afford a guide :tor the late 28 whereby the latter may be moved ongitudinall in and out of its position on the pane 25 without shifting laterally The notches' c and d on the lower margin oi the end slot 24 serve to accommodate the flanges c' and j on the plate 28. As a means for hol the razor blade on the plate 28 the latter may y be ,formed with a recessed central portion as indicated at 29 in Fig. 5 having arcuate end walls l and m conformable to end curvatures of the blade so that when the blade is seated in the recess-29 as indicated in dotted lines in Fi 5 the ends of the blade will be coniined y the arcuate walls Z and m thereby holdin the blade against lateral and longitudna movement with relation to the carrier plate. This carrier plate is such width that when the razor blade is su ported thereon the cutting edges of the bla e will project slightly beyond the marns of the plate. A. modification of the blae holding structure is illustrated in Fig. 6 in which the plate 28 isshown as formed with a pair of upwardly projecting tongues 'a and o which are adapted to be inserted through holes formed in the razor blade to hold the latter against longitudinal and lateral movement.

In the operation of the invention, the razor blade to be sharpened is positioned on the carrier plate 28 and the latter is inserted lengthwise through the slot 24 so as to position the blade withboth its cutting edges extending throughout the length thereof close to but not touching the-

magnet poles

11 and 12. In thus positioning the carrier plate 28 on the panel 25 the

plates

26 and 27 on the ton es e, f, g and h will be sprung upwardly so t at the tongues .will be placed under tension whereby the

plates

26 and 27 will bev ength of time to accomplish the desired result. .'lo remove the blade, the blade-carrying plate 28 is withdrawn from the magnet housingand the blade removed therefrom. The end flange it on the blade carrier serves to facilitate grasping the latter in eecting its withdrawal from the slot 24.-

ile l have shown and described a speciic embodiment ci my invention, ll do not limit myself to the exact details ci construction or arrangement sho, but may employ vauch cha come within the meaning and scope ofl the appended claims.

l claim l l. In a magnetic blade Sharpener, a magnet having opposed poles, a fixed panel extending between the poles oi the magnet, and a blade-carrying plate slidably enga cable with said panel for positioning a bla e carried thereon betweenthe poles of the ma et.

2. A magnetic blade Sharpener comprising a magnet having opposed poles, a housing enclosing said magnet, a fixed panel carried by said housing extending between the poles of the magnet, a demountable blade-carrying plate having side anges, said plate being slidable longitudinally of said panel, means for holding a blade on said plate against longitudinal and transverse movement relative thereto, and means 'carried by said housing for exerting a pressure on a blade carried by said plate.

3. A magnetic blade Sharpener comprising a magnet having opposed poles, a housing encasing said magnet havin an end slot opening on a plane extending etween the magnet poles, a xed panel leading from said slot and extending between the magnet poles, a plate. slidable longitudinally through saidslot, means cooperating between said plate and panel for guiding the plate on longitudinal movement thereof on the panel, means for supporting a blade en said plate, and means es and modications asA clearly blade carriedy for exerting a pressure on a ythe late.

4. The method o k'eenness to blades, cons istingof introduc the blade longitudinally into a magnetic fie d of force, maintainin the blade flat under pressure substantial y parallel to a plane` that bisects the m'ajor intensity ofthe magnetic field and is substantially parallel to the magnetic lines of force thereof, and withdrawing the blade longitudinally from the field of force.

5. The method of restorin keenness to blades, consisting of introducln the blade into a magnetic field of force an withdrawing the blade `from the field of force, and maintaining the blade at under pressure while in said field of force and during its on the housing withdrawal and e'ecting such withdrawal is substantially .of force thereof.

substantially parallel 'to a plane that bisects the major intensity of the magnetic ield and parallel to the magnetic lines 6.. In a magnetic blade shar I ner, a magnet ing a magnet having opposed poles, a housing encasmg said magnet havin an end slot opening on a plane extendin tween the magnet poles, a fixed panel le g from said slot an'd extending between the magnet poles,

a plate slidable longitudinally throu h said ting edge disposed contiguous to but spaced in relation thereto.

. In testimony whereof, I have aflixed my signature.

HENDERSON W. KNOTT.

ha spaced poles, means or introducing a bla e etween said poles on a plane that bisects the' axis of major intensity of the magnetic field and is substantially parallel to the lines of force thereof and for removing said blade on asimilar plane, and means for holding said blade fiat under pressure while in saidmagnetic field.

7. In a-magnetic blade Sharpener, a magnet havin spaced poles, means for lintroducing a bla e between said poles, and for removin the blade on a vplane that bisects the axis o major intensity of the ma etic field and is substantially arallel to t e lines of force thereof, means or mainta' a blade fiat under pressure while between said poles, and means for holdin the blade wit the edges thereof in paral el spaced relation to said oles while dlsposed therebetween.

' 8. In a magnetic blade shar ener, 'a magnet, means for introducing a bl el into the mag-- netic field of said magnet and for removing said blade from said field longitudinally on i a plane that is substantially. parallel tothe lines offforce of said magnetic field, and

means` for exerting pressure on said'blade while in said magnetic field.`

9. In a magnetic blade sharpener, a magnet, means for introducing and removing a blade longitudinally under ressure into and out of the magnetic field. o said ma et in such a manner that the blade shall at times be onla plane substantially parallel with the lines of force of said magnetic field. `10. In a device of the class described, the

i combinationA of a hollow casing, a magnet havin spaced poles disposed within the casing, a lade holder adapted for insertion into the casing, land means operative to frictionally retain said holder between the poles of y the magnet when inserted in the casmg.

11. A magnetic blade Sharpener compris-