US2287317A - Blade-sharpening and honing device - Google Patents

Description

June 23, 1942. s. P. McD QNNELL 2,287,317

BLAD E-SHARPENING AND HON ING DEVICE Filed June 25, 1941 2 Sheets-Sheet 1 Inventor Attorney June 23, 1942.

S P. M DONNELL BLADE-SHARPENING- AND HONING DEVICE I Filed Jun 25; 1941 2 Sheets-Sheet 2 Inventof -3te;akefz7iajz7zdl.

Attomey Patented June 23, 1942 UNITED STATES PATNT QFFICE BLADE-SHARPENING AND HONING DEVICE Stephen P. McDonnell, St. Cloud, Minn. Application 'June 25, 1941, Serial No. 399,712

3 Claims.

This invention relates to devices for sharpening and honing blades, and more particularly to such devices as are particularly designed for sharpening and honing safety razor blades 01 both the single and double-edge types.

The invention together with its objects and advantages will be best understood from a study of the following description taken in connection with the accompanying drawings wherein:

Figure 1 is a top plan view of a blade honing and stropping device embodying the features of the present invention.

Figure 2 is a longitudinal sectional view through the device taken substantially on the line 22 of Figure 1.

Figure 3 is a fragmentary side elevational view of the device taken adjacent one end of the latter.

Figure 4 is a transverse sectional view taken substantially on the line 4-4 of Figure l, and

Figure 5 is a plan view of a blade holder embodying the features of the present invention.

Referring more in detail to the drawings, it Will be seen that the device embodies a frame of metal or other suitable material having the opposed sides 11 supporting therebetween an elongated substantially hollow honing block 9 the opposite end portions of which terminate short of the ends of the side members 1 and are rounded as at It).

The member 9 may be formed of any suitable abrasive material and is secured at its opposite longitudinal edges to the sides I in any suitable manner.

When the device is used for stropping, a strop 6 is secured about the honing block or member 9 as shown, the strop 6 being provided with suitable buckle means 611 for securing it in position on the honing block or'body member 9.

Above the top surface of the honing block or body member 9, the sides 1 are provided with longitudinal slots 8 that in length slightly exceed the length of the honing block 9 as shown in Figure 2.

Also in accordance with the present invention there is provided a blade holder, indicated generally by the reference numeral H.

The blade holder II is provided with a bifurcated frame member l2 having ends 13 provided with openings through which extends a rod I4. The rod M has rounded ends accommodated in the slots 8 and on one of said rounded ends is a ratchet wheel 4 while on the opposite end of the rod is a double-armed lever l5.

Intermediate the ends thereof, the rod l4 has extending therefrom blade-accommodating and retaining studs l6, and between the studs I6 is provided with a threaded socket to accommodate a retaining bolt I! that coacts with a retaining bar 19 that bridges the space between the studs l6 for holding a razor blade l8 in fixed position on the bar Hi to rotate therewith.

Acting on the rod 14 for rotating the same in a direction to yieldably, and under pressure, urge an edge of the blade l8 into engagement with the honing member 9, or strop 5, as the case may be, there are provided coil springs 2!; each coil spring having one end thereof suitably secured to the rod M and an opposite end thereof suitably engaged with the extremity I3 of the frame member l2.

Further the blade holderembodies a handle 23 provided for manual reciprocation of the blade holder.

For rotating the rod l4 and blade 19 associated therewith, a quarter of a turn, as the blade holder approaches one end of the device, and the edge of the blade being sharpened clears the hone 9, whereby to effect a sharpening of the opposite edge of the blade, there is pivoted to one of the side members I of the frame, at one end of the frame a trip bar 21. This bar 2'! is pivoted to said side member I as at 28 and is normally supported in a horizontal position through the medium of a stop pin 29 projecting from said side member 1 in the path of the free end of the bar 21 as shown in Figure 3.

Adjacent said free end the bar 21 is provided with a lug 39 that is normally in the path of the double-armed head l5. It will thus be seen that as the blade holder with the blade mounted therein clears the rounded end of the hone 9 at the left-hand end of the device as viewed in Figure 1, an arm of the head I5 will engage the lug 30 causing the rod I4 to rotate a quarter of a turn for bringing the opposite edge of the blade in position to engage the surface of the honing member 9, or the strop 6, as the case may be, with the springs 2| then acting to yieldably retain said edge of the blade in engagement with the sharpening surface as the blade holder is then moved lengthwise of the device towards the right in Figure 2.

As the blade holder moves to the right in Figure 2, the blade thereon will clear the right-hand end of the hone 9, and to rotate the rod I4 and associated blade a full half-turn to present an edge of the blade, at the opposite side of the blade, for contact with the sharpening surface, there is pivoted on the opposite frame member l at the right hand end of the device, and as indicated at 24, a rack bar 25 that is normally supported in horizontal position through the medium of a stop pin 26.

Obviously the rack wheel 4 will coast with the rack bar 25 for rotating the rod l4 its required one-half turn.

In Figure 2 the parts are shown with the blade holder 23 being moved towards the right-hand end of Figure 2.

From the foregoing it will be seen that in sharpening or honing the blade, the device is so operated that first one edge of the blade at one side of the blade is sharpened, and then on the return stroke the opposite edge of the blade on the same side is sharpened. When the sharpening of the edges on the corresponding sides has been completed the blade-holding rod I 4 is rotated a half-turn so that by repeating the operation first one edge and then the opposite edge of the blade, on the second side thereof, is sharpened or honed as the case may be, depending upon whether the honing block 9 or the strop 6 is used.

The above description of operation has, of course, been in connection with the stropping or honing of double-edged. blades. Substantially the same operation is performed in sharpening or honing a single-edged blade with the exception that under such circumstances, the function of the ratchet wheel 4 is omitted and, of course, a suitable type of holder will be provided for and used in the sharpening of a single-edged blade.

Accordingly, while I have herein illustrated and described what is considered by me to be the preferred embodiment of the invention, I am well aware that the details of construction herein illustrated may be altered as the use of the device in practical fields may require, and that such alterations should come within the scope of what is claimed.

Having thus described the invention what is claimed as new is:

1. In a blade honing and stropping device, a frame embodying a pair of opposed parallel side members, a, sharpening element supported between said side members, a blade holder movable longitudinally of said frame and embodying a rotatable blade-carrying rod having ends thereof engaging in slots provided longitudinally of said sides of the frame, a double-ended head on one end of said rod, a trip bar on the frame in the path of the head for effecting a quarter of a, turn of said rod, a gear on the other end of said rod,

and a rack bar on the other of the sides of said frame at the end thereof opposite to the firstnamed end of the frame and disposed in the path of the gear for effecting a one-half revolution of said rod.

2. In a blade honing and stropping device, a frame embodying a pair of opposed parallel side members, a sharpening element supported between said side members, a, blade holder movable longitudinally of said frame and embodying a rotatable blade-carrying rod having ends thereof engaging in slots provided longitudinally of said sides of the frame, a double-ended head on one end of said rod, a trip bar on the frame in the path of the head for effecting a quarter of a turn of said rod, a gear on the other end of said rod, and a rack bar on the other of the sides of said frame at the end thereof opposite to the firstnamed end of the frame and disposed in the path of the gear for effecting a one-half revolution of said rod; said abrasive body having its respective opposite ends terminating short of the ends of said sides of the frame and being rounded to facilitate turning movement of the bladecarrying rod.

3. In a blade stropping and honing device, a frame embodying a pair of opposed spaced parallel side members, an elongated abrasive member supported between the sides of said frame and at its respective opposite ends being rounded and terminating short of the ends of said side members of the frame, a strop trained about said abrasive body and secured at its ends at the underside of said abrasive body, said sides having slots elongated longitudinally thereof, a blade holder movable longitudinally of the frame and embodying a, blade-carrying rod having its respective opposite ends engaging said slots, a double-armed head on one end of said rod, a trip bar pivotally mounted on one of said side members adjacent one end of the frame and cooperable with said double-armed head for effecting a quarter of a turn of the blade-carrying rod as the blade holder and blade associated therewith clears one end of the abrasive body, a rack wheel on the opposite end of said blade-carrying rod, and a rack bar pivoted on the other of said side members of the frame at the end of the frame opposite to the first-named end thereof and coacting with said rack wheel for effecting a half-revolution of said blade-carrying rod when the blade holder and associated blade clears the corresponding end of said abrasive body.

STEPHEN P. MICDONNELL.

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