US1811903A - Hair clipper - Google Patents

Description

Patented June 3G, 1931 Y'UNITED STATES vPATEiVr OFI-"lolaA HUBERT VAN BREE, 'or RACINE, wIsCoNsIN, AssIGNOR To RACINE UNIVERSAL MOTOR COMPANY, or RACINE, wIsCoNsIN, A CORPORATION F WISCONSIN YI-IAIRV GLITTER Application flied Api-i1 is,

This invention relates to hair clippers of the type in which an electric` motor contained in the handle of the tool serves toreciprocate a toothed cutting blade in closerelationto a-toothed stationary blade.

The object of the invention is to simplify the construction; to improve the direct driving connection between the motor shaft `and the movable blade to produce quiet opera- .Yrf tion; and to more effectively hold the movable blade in contact with the stationary blade `to effect the shearing action. Y

`With' the above and other objects in view the invention consists in the hair clipper as l? herein claimed and all equivalents.

Referring to the accompanying drawings, in which'like characters of reference indicate the same parts in different views,

Fig. 1 is a side elevation of a. hair clipper constructed in accordance with this invention Fig. 2 is a plan view of the end thereof;

Fig. 3 is a similar view with the coverpiece removed;

Fig. 4 is a central sectional view on the plane of line 4 4 of Fig. 2;

Fig. 5 is a transverse sectionalview of the stationary blade with the movable blade mounted thereon, on the line 5--5 of Fig. 1;

Fig. 6 is a bottom view of the cover-piece;

Fig. 7 is a central transverse sectional view of the movable knife blade, and Y Fig. 8 is a plan view of the movable knife blade.

In these drawings, 10 indicates the handle of the tool, which, as usual, serves as a casing for an electric moto-r, the details of which are not shown except that the end of the motor shaft is provided with an-eccen- 4:0 tric or wrist pin 11 for driving the clipper blade. The lead-in wires 12 through which the motor is supplied with electrical current from a. suitable service outlet are shown, as well as the motor switch 13 and a. suspension 15 loop 14 by means of which the tool may be supported when not in use.

At the working end of the tool handle there is a head member 15 secured to the end of the motor casing or handle by means of screws 16 so as to be removable therefrom 1929. Serial No. 356,065.

and said head member has an oblique face at an angle of approximately Oto the axis of the motor shaft. Secured to this face in the plane thereof is the stationary knife blade 17 removably held by 'screws 18 and provided with the toothed knife edge as usual. A movable knife blade 19, also with a toothed cutting edge as usual, is slidabl mounted on the stationary knife blade witfi Yfiber guide blocks 20 thereon working in the grooved way 21 of the stationary knife blade. i

The removable knife blade, as seen in Fig. 8, has a cut-away portion at its rear edge eX- tending to its center to receive the wrist-'pin 11 of the motor shaft. On either side of the Acut-away portion is mounted by means of a screw 22 a bearingspring 23, which consists of a strip of spring metal bent to form aV loop with its ends brought together and clamped' between the face of the knife blade and the head of the screw. The loops of the bearing springs 23 extend below 'their plane of attachment as well as above,A as best seen inV Fig. 5V, and their adjacent portions are straight'and parallel with each other to form yielding bearing walls of a slot, within which the wrist-pin 11 turns to produce the reciprocating movements. A The wrist-pin is -surrounded by a tight-fitting sleeve 24 of liber or the like material fitting without play between the bearing walls of the slot formed between the bearing springs 23. In fact the sleeve 24 is slightly larger in diameter than the space between the loops of bearing springs 23 so as tocause a slight 'deflection thereof to accommodate it. Thus the the movable knife blade, 'the walls of which slot are yielding and are bowed to re wrist-pin travels in a vertical slot -of ing the movable knife blade in bearing contact with the stationary knife blade to produce a shearing action between them and this without interfering with 'the movements of the knife blade. For this purpose a coverpiece 25 is secured in the angular seat provided for it in the head l5 and is removably held in place by screws 26. Its overlying front portion is close to the movable knife blade without contacting and is provided with a pair of spring-pressed balls 27 which slightly protrude from the face of the coverpiece and bear with light pressure upon the movable knife blade near the ends thereof. This insures the knife blades being held together with suflicient pressure to perform the shearing action without undue resistance to the movements.

Lubrication for the wrist-pin driving connection and for the bearing of the movable knife blade on the stationary knife bladeis afforded by an oil hole 28 in the cover-piece 25, while oil holes 29 supply lubricant to the spring-pressed balls 27, and an oil hole 30 lubricates the motor bearing. The balls 27 are housed within recesses in the cover-piece 25 and are confined by slotted apertured screw plugs in the manner common with selfclosing oil holes. The balls, while not intended to turn, are free to do so, but their yielding point contact with the movable knife blade gives the desired pressure without undue resistance to motion.

By reason of this invention the movable knife blade is firmly held in shearing contact with the stationary blade and is yieldingly coupled with the wrist-pin of the motor shaft Without play and is therefore driven without noise and with spring action, rendering it most efficient in the performance of its functions and noiseless in its operation.

What I claim as new and desire to secure by Letters Patent is:

l. 'A hair clipper comprising a handle containing a motor-driven shaft, a vwrist-pin thereon, a stationary knife blade on the handle at an angle to the shaft, a movable knife blade on the stationary knife blade, there being a cut-away portion in the movable knife blade to receive the wrist-pin, and bearing springs on the movable knife blade on either side of the cut-away portion bent to form closed spring loops parallel to each other and extending into the cut-away portion and receiving the wrist-pin between them and forming a way in which the wrist-pin slides.

2. A hair clipper comprising a motordriven shaft, a movable knife blade, a pair of bearing springs thereon comprising strips of spring metal bent to form elongated closed loops with their ends brought together and secured to the movable knife blade between the ends of the loops, said spring loops being parallel to each other and forming al yielding slot between them fitting on the wrist-pin and forming a way in which the wrist-pin slides, and a stationary knife blade co-operating with the movable knife blade.

3. A hair clipper comprising a handle containing an electric motor, a wrist-pin on the shaft of the electric motor, a head member on the handle surrounding the wrist-pin and having a face at an angle to the axis of the motor shaft, a stationary knife blade on the angular face of the head, a movable knife blade slidably mounted thereon and having a cut-away portion at its rear edge receiving the wrist-pin, bearing springs secured to the movable knife blade on either side of the cut away portion and forming parallel spring loops extending into said cut-away portion and angular to the plane of the movable knife blade to form a yielding guide slot between them receiving the wrist-pin and within which the wrist-pin slides, there being an angular seat on the head member, a cover-piece secured thereto to enclose the wrist-pin, and independent spring-pressed balls in the cover-piece bearing on the movable knife blade near the ends thereof to hold it in contact with the stationary knife blade.

In testimony whereof, I aiiiX my signature.

HUBERT VAN BREE.

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