US2077331A

US2077331A - Shaving device

Info

Publication number: US2077331A
Application number: US86225A
Authority: US
Inventors: Knopp Rudolph
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-06-20
Filing date: 1936-06-20
Publication date: 1937-04-13
Anticipated expiration: 1954-04-13

Description

April 13, 1937. R, KNQPP 2,077,331

SHA'VING DEVICE Filed June 20. 1936 2 Sheets-Sheet 1 ATTORNEY April 13, 1937. R KNOPP 2,077,331

SHAVING DEVICE Filed June 20, 1936 2 Sheets-Sheet 2 INVENTOR BY RudolpilKno vp ATTORNEY Patented Apr. 13, 1937 UNITED STATES SHAVING DEVICE Rudolph Knopp, Brooklyn, N. Y., asllgnor to Raymond Knapp. New York, N. Y.

Application June 20, 1936, Serial No. 86,225

3 Claims.

This invention relates to improvements in shaving devices.

An object of the invention is to provide a device of the above character comprising self-aligning blade members.

Another object is to provide a device of the above character in which free egress for hair shavings may be assured.

A further object is to provide an improved unitary outer blade member.

Another object is to provide improved means to reciprocate and maintain the movable blade member in contact with the stationary member.

A further object is to provide a device of the above character which may be simply and cheaply manufactured.

Another object is to provide a device of the above character having cutting elements angularly disposed to the handle or body whereby manipulation of the device is facilitated.

Other objects and advantages of the invention will become apparent during the course of the following description in connection with the accompanying drawings, in which:

Figure 1 is a front view, partly in section, of a preferred form of the device;

Figure 2 is a side elevation of the same;

Figure 3 is an enlarged vertical cross section showing the blade structures, actuating means and related parts;

Figure 4 is an enlarged fragmental view, partly in section, on the lines 44, Figure 3;

Figure 5 is an enlarged fragmental plan view 01' the outer blade member or plate;

Figure 6 is a detail front view of the same;

Figure 7 is a fragmental cross sectional View of the same illustrating the method of construction;

Figure 8 shows an alternative form of the device, partly in section, viewed from the cover side;

Figure 9 is a side elevation of the same;

Figure 10 is an enlarged sectional detail view of the upper or operating portion of the same; and

5 Figure 11 is an enlarged sectional view taken on the lines |l-l I, Figure 10.

Referring to Figures 1, 2, 3 and 4, the numeral HI indicates a hollow body to which is detachably secured a closure plate II. The body and cover,

5 preferably made of insulating material, are shaped to provide a convenient hand grip.

A shearing plate member comprising a frame 12 holding a plurality of cross bars i3, is detachably secured to the upper end of the body III by means of counter-sunk screws ll threaded into frame l2. The lugs II are sunk into the body It to present a flush surface, and the screws II have relatively wide slots l6 adapted to be engaged by a coin such as a ten cent piece to permit convenient removal of the screws when it is desired to detach the frame l2 from the body Ill.

The cross bars I3 are formed of triangular wire bent into the shape of an inverted U, and having straight vertical legs I]. The lower ends ll of the legs H are embedded in the material of the frame I Z and may be bent slightly outward to insure rigid and permanent location therein. The bars are formed with an apex of the triangular section outward, and the inner faces are ground to give accurate flat surfaces, this grinding being preferably done on the wire previous to the formation of the U-shaped bars. The bars are placed in a die-mold adapted to hold them accurately in position and the frame I! is die-cast about their lower ends I8. 20

After removal from the die the top surfaces of all the bars except the outer bars l9 and 2B are ground down flat until the desired thickness of blade or plate is left, the remaining sections being in the shape of thin trapezoids having acute bottom shearing angles corresponding to the original base angles of the triangular wire section. As the fiat upper surfaces thus produced terminate at the remaining unground corner bends of 30 the wires at a level slightly above the line of the inner corners, as shown in Figures 5 and 7, the surfaces merge at a slightly obtuse angle and without any outstanding lateral lips or projections. This construction prevents scratching the users skin as the device is moved over it. The outwardly facing apex surfaces of the legs I! act in the manner of a comb to guide the hairs into the openings between the bars and thus into position for shearing as hereinafter set forth. The outer bars I9 and 20 are left ungroundon their upper surfaces, acting as rigid side guards protecting the thin shear plate bars from injury and distortion and also preventing injury to the user's skin from lateral contact with the shearing parts.

A lever 22, Figures 1, 3 and 4. is mounted on a pivot 23 secured in the body Ill. The lower arm of the lever 22 terminates in a fork 24 which spans an eccentric 25 on the shaft 26 of a motor 21 of any suitable type, such as an electric motor adapted to receive current through a flexible cord 28. It is obvious that a suitable spring motor may be used if desired. When the shaft 26 revolv'es, the eccentric 25 acts through the fork 24 to oscillate the li -er 2!.

The upper end of the lever 22 has secured therein a shouldered screw 29 on which is rotatably mounted a rectangular block 30.

The block 30 slidably engages a vertical slot 3| in a yoke member 32 having vertical arms 33 and 34 extending upwardly through slots 35 and 36 in the top of the body Ill. The upper ends of arms 33 and 34 engage

notches

31 and 38 in the downwardly extending web 33 of a movable cutter or shearing member 40. The member 40 has a series of upper shearing blades 4| having ground top surfaces engaging the ground bottom surfaces of the stationary bars or blades l3. A torsion spring 42, disposed around the screw 29, has ends 43 and 44 hooked under the lower edges of the yoke member 32. The spring 42 thus urges the member 32 upward and the latter in turn presses the cutter member 40 upward, holding its blades 4| firmly in flat contact with the stationary blades or bars When the device is in operation the oscillation of the lever 22 reciprocates the yoke member 32, the block 3|! sliding in the slot 3| to compensate for the changing angularity of the lever.

The arms 33 and 34 in turn reciprocate the cutter 40, the blades 4| being drawn back and forth across the stationary blades or bars l3, thus shearing the hair guided between the bars as the device is drawn over the user's skin.

From the foregoing it is evident that the shear member or cutter 4|) is reciprocated by a straight line motion of the yoke 33, and that the cutter is pressed firmly into contact with the stationary shear plate by the same members, that is the arms 33 and 34, which serve to drive it, pressure being applied to two widely separated points of the member 4|). The upper ends of the arms 33 and 34 are thicker than the web 39, and are made slightly concave as shown in Figure 3 and by dotted lines in Figure 4. The upward pressure of the arms through these concave surfaces tends to keep the cutter centered in the inside of the U-shaped station- 45 ary blade assembly, eliminating the necessity for guide rails and assuring even application of pressure throughout the lateral extent of the blades 4|. Due to the above provisions, the surfaces of the movable and stationary cutters are evenly pressed together throughout their entire contact areas, making possible the best possible shearing action and retaining the accurate sharpness of the shearing edges, while the number of parts is reduced to a minimum.

The lugs l5 are of such length as to provide a relatively wide opening 45 for the free egress of sheared hair between the frame l2 and the top of body III.

By removing the screws I4 the frame l2 with its shear bars l3 may be drawn upward and removed from the body ll), thus also allowing removal of the cutter member 4|). When these parts are removed the yoke member 32 is pressed upward flat against the upper inside surface of the body l0. By this means the arms 33 and 34 are held firmly at the same height, facilitating the replacement of the member 40 thereon. To further facilitate replacement the openings of

notches

31 and 38 may be flared as shown in Figure 4.

In the form of the device shown in Figures 8, 9, 10 and 11, a member 46 forming an extension of the body 41 is secured thereto by means of a screw 48 bearing on a tongue 49 formed on 15 the member 46, the tongue being seated in a transverse groove 50 in the main body 41. The shear plate frame I2 is angularly secured to the extension member 46 as shown in Figures 9 and 10, by means of the screws |4 through the lugs |5 in the manner previously described. The angularity of the frame l2 with respect to the body 41 facilitates application of the device to the user's face while holding the body 41 naturally and comfortably in the hand.

The cutter member 5| in this form of the device is constructed in the same manner as previously described except that its web 52 is provided with two outer notches or

indentations

53 and 54 and a central driving notch 55. Pins 56, Figure 11, loosely guided in a retaining plate 51 secured to the extension 43, are pressed into the

indentations

53 and 54 by means of springs 58 hearing against flanges 53 formed on the pins, the springs and rear ends of the pins being disposed in holes or sockets 60 in the extension 46. By this means the cutter member 5| is resiliently pressed upward against the stationary shear blades l3 by pressure applied at two widely separated points, maintaining the surfaces of the shearing elements accurately and evenly in contact, the pins 56 oscillating in the plate 51 as the cutter is reciprocated.

The lever 6|, Figures 8 and 10, pivoted to the body 41 by means of the pivot-screw 23, is adapted to be oscillated by means of the eccentric 25 engaging the forked lower portion 62 of the lever in the manner previously described. The upper arm 63 of the lever 6| is curved as shown in Figure 10 to extend through a curved slot 64 in the body extension 46, and terminates in engagement with the central notch 55 in the web 52. When the lever BI is oscillated its extension 63 reciprocates the cutter member 5| to perform the shearing action previously de scribed, the sheared ends of hair being allowed free egress through the opening 45.

It will be seen that the operation of the device is substantially the same as that described in connection with Figures 1 to '1, the two point application of resilient pressure in this case being accomplished by means of the pins 56 in order to permit the disposal of the shearing elements at a convenient angle.

While the invention has been described in preferred embodiment, it is not limited to the precise structures illustrated, as various modifications may be made without departing from the scope of the appended claims.

What is claimed is:

1. In a device of the character described, in combination, a body, a shear plate frame having downwardly extending lugs embracing said body and detachably secured thereto, a plurality of substantially U-shaped bars spanning said frame and comprising straight transverse portions and legs perpendicular thereto and terminally embedded in said frame, said legs being of substantially triangular cross section with outwardly directed apex edges and said transverse portions being of thin trapezoidal section having outer flat faces joining said apex edges at an obtuse angle, a shearing cutter in said frame, a lever in said body, a yoke mounted on said lever and having arms extending outward through said body and engaging said cutter, means to oscillate said lever whereby said cutter maybe reciprocated, and resilient means to urge said cutter against said transverse portions.

2. In a. device of the character described, in combination, a body, a shear plate secured thereto, a cutter cooperative with said shear plate, a

3. A device as claimed in claim 2 including a pin on said lever and a block rotatably mounted on said pin, said yoke having a longitudinal slot slidably engaging said block, and wherein said resilient means comprises a torsion spring retained on said pin and engaging said yoke.

RUDOLPH KNOPP.

CERTIFICATE OF CORRECTION.

Patent No. 2,077,351. April 13, 1937.

RUDOLPH KNOPP It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 1 second column, line 1 strike out the words "frame 12. The lugs 15 are sunk into the body and insert instead the body and engaging lugs 15 formed on the frame 12. The lugs 15 are sunk into the body; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 1st day of June, A. D. 1937.

Henry Van Arsdale (Seal) Acting Commissioner of Patents to, a cutter cooperative with said shear plate, a

RUDOLPH KNOPP.

CERTIFICATE OF CORRECTION.

Patent No. 2,077,351. April 13, 1937.

Signed and sealed this 1st day of June, A. D. 1937.

Henry Van Arsdale (Seal) Acting Commissioner of Patents