US1476151A - Stropping machine - Google Patents

Description

Dec. 4 1923. I

. R. P. CUMMINGS STROPPING' MACHINE Filed Feb. '27

In rental:

IIIIIIII! "I'll" Patented Dec. 4, 1923 UNI ED sre'rss Mimi RALPH P. CUMMINGS, or soccer: ronrnann, name.-

srnorrmonncnmn Application filed February 27, 1922. Serial n 'aaavor.

To all whom it may concern:

Be it known that I, RALPH P. CUMMINGS, a citizen of the United States, residing at South Portland, in the county of Cumberland andStateof Maine, have invented new and useful Improvements in Stropping Machines, of which the following is a specification. r I

My invention relates to that class of machines into which so called safety razor blade maybe inserted and by a movement to and fro over the surface of a strop whet or sharpen same until a keen edge is produced. I

In my mechanism the-blade is so presented to the surface of the strop as to get a whet ting action partly cross-wise and partly length-wise of the cutting beveled edge. I have demonstrated that I can produce 'a keener cutting blade by this method;

By referring to the drawing accompanying this specificationthe design and principle of construction can be clearly seen. In 1, I show, in perspective, the assembled device, with the blade inserted in the holder. and outline ofstr'op in dot and dash lines;

Fig. 2 is a view, in perspective, of a part of' the blade holder, showing a bladepartly inserted in same; Fig. 3 is a plan View of the completemachine; Fig. 4 is a side view, taken from the side'on which is the rack and pinion gear, and Fig. 5 is a sectional view taken on line mw, Fig. 3.

Similar numerals refer to similar parts throughout the several views.

Pivotally mounted on a base plate 1, and turning about screw pin 2, is a flat: bar 3 with upturned ends 42, 4, in holes 5, 5, in which, rotates rod 6. On this rod 6 is riveted or otherwise secured a blade holder 7, in the bifurcated edge of which can be inserted a safety-razor blade in its own mounting, as seen at .8. The two outwardly projecting bifurcations,'or as I may term them, plates,

of which holder 7 is partly composed, are

seen at 7', and in assemblingthis holder, these plates are slightly sprung together,

thus tending to hold the blade, within itsmounting, with a slight frictional grip. The angular actionor pull on the blade when the machine is in operation drives it up firmly against the collar 9, which prevents further end movement to the blade. Beads over edges of plates 7 7 prevent the blade mount from pulling I out of the holder while the strop. I

n5 7 the machine is sliding along the surface of. v V secured to the top other 3, i

directlybeneath the blade holder 7, two side that a very supple and. resilient'contact of p the blade with the strep may be obtained,

while at the same time a dependable support p is provided for both. On the over-hanging end of bar 3 is a vertical handle or post 12, for operating the machine.

f Opposite the operating end of bar'3,'and mounted rigidly on rod .6, is a segmental gear 13, adapted to operate in-circular rack 14, cut on over-extending edge of base plate 1; While I have described this as one method of imparting rotary movement to rod 6,I do not confine myself specifically to this design, as any'praotical combination of cams "and levers which will accomplish my purpose may be substituted.

.On both ends of the. base plate 1: are

fenders 15,,extending upwardly from the fioor of the plate and having securely fixed in-each, rods" 16, which extend across. the 3 space between sides 15, '15. At 17 is shown the extreme ends of the base plate'bent upward to form friction guards. 'By reference to- Fig. 5 it will be seen that the strop'1'8 does not have a perfectly free movement 'be-.

tween rod 16 and guard 17, or ingother words there is a slight tendency'to retard the free and uninterrupted travel of the machine over the strop, the .reason for providing which feature to be hereinafter made clear. i

In Fig. 4 the position assumed by the blade, gear and other parts is such as would take place by .the movement ofthebar 3 .to

central position, or on line y g Fig. 3.-

There are also seen in Fig. 3 the two extreme positions of the movable parts of mymachine. Parts shown in. full lines would move in the direction of the arrow, shown in full lines; and contra-wise for dotted parts. The blade upon which the stropping has been completed may be detached from the 7 machine by pulling out of the holder, length- ,12 and pulls or pushes, depending on which end of the strop the machine may be located. In Fig. 3 we will assume that the machine 7 has just reached the extreme right hand end of-the strop (holder shown in full lines). It

might appear at glance that a bacle ward pull (or to the left as seen in draw ing) of the handle would force the blade into the strop. Such, however,- is not the case; what happens is this The slightfrictional resistance of the machine over the strop, where the latter passes between rod 16 and guard 17, and to which reference has heretofore been made, is suf'icient to hold the body of the machine on the strop while pulling thepostor handle 12 from the position at A to the positionat B; It is, in other words, a slip. movement, and there is no tendency whatever for the blade to become imbedded in the strop when reversing the direction of movement. The slightest action'of post 12 startsgear 13 into action with rack 14', and

' as the former is rigidly secured to shaft 6,

which is in turn secured to holder 7, the blade will start upward from the strop on the first movement of gear 13, and until it has taken an extreme opposite position'on the base plate, no movement of the machine forward can be made.

Thetension of theblade on the strop constitutes a stop to pull or push the machine backward or forward and is in. proportion tothe amount of force applied to post 12 in a turning action around pivot pin 2. As stated in the preamble, the'stropping is a combination of crosswise and length-wise whetting of the blade on the strop. The

' blade is placed at an angle with the strop and without change of this angle is drawn over the length of the strop. The other side,

on the reverse movement, is treated likewise. Then by removing the blade fromthe holder and IGlIlSQItiIlgltWlth theends reversed a cross whetting isobtained.

This accomplishes what draw and cross filing does to a piece of steelwhere the cross filing marks show up, the draw filing The action of my 1 will smooth them off. machine gives a better edge to the razor, polishes the bevel-by cross-whetting, taking out the minutest abrasions, and with the same length off-blade does not. require as wide a strop in operation. v

Having thus described mylinvention, I claim: I

A stropping machine comprising a'base member-slidably mountedon a strop and having an arcuate rack thereon, frame pivotally mounted on said base member and adapted to be swungthrougha part of the circumference of a circle, around a pivot, an oscillating member journalled in said frame, a'blade holder, adapted to hold the blade yieldin'gly, rigidly secured to said oscillating member, a pinion rigidly secured to said oscillating member and in mesh" with said rack on said base member, resilient supporting members beneath and 'in' contact with the strop, and at a spaced distance from the cutting edge of the blade, fenders on the ends of the basemember to properly guide the machine along the length of the strop, guards on the ends of the base member projecting upwardly for applying a slight frictional resistance to the progress of the machine along the surface of the strop, means for actuating the frame so as to place the blade in proper relationto the direc--- RALPH P; CUMMINGS.

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