US2238641A - Vibratory motor - Google Patents

Description

,1. A. HANLEY VIBRATORY MOTOR Filed got. 1,

April 15, 1941.

L" ATTORNEY INVENTOR A BY uauunnunaunuuouuuuu \auauunuuuuuuununuuu w Patented Apr. 15, 1941 2,238,641 vmaa'romz MOTOR John A. Hanley, Noroton, Conn., assignor to Gillette Safety Razor Company, Boston, Mass., a

corporation of Delaware Application October 1,1940, Serial No. 359,269.

4 Claims. (Cl. 172-126) This invention relates to small vibratory motors of the types adapted for operating dry shaving implements or similar devices.

In general the objects of my invention are to I provide a motor of extremely compact construction, occupying a minimum amount of space for the power developed and having provision for various adjustments which facilitate the manufacturing and assembling operations, permit regulation of the armature gap and adjustment of the path and amplitude of the driving element. Such adjustments are of particular importance when the motor is employed to actuate a dry shaver where it is important to have the ,shearing teeth register at a definite point in the cycle of the implement or where the amplitude of re.- ciprocation of the movablecutter must be regulated to a nicety in order to secure the desired timing of the shearing action.

These and other features of the invention will be best understood and appreciatedv from the apertures in the plate I I. Accordingly, when the screws I4 and I5 are loosened, the apertures surrounding them afford clearance permitting a substantial adjusting movement of the plate in all directions.

The adjustment of the base plate II in the casing is regulated and controlled by a transverse slot l6 located near the lower 'edge of the following description of a preferred embodiment thereof, selected for purposes of illustration and shown in the accompanying drawing, in which:

Fig. 1 is a plan view of the motor shown with the covering-half of its casing removed;

cular socket, similarly provided for it in the body of the casing Hi. It will be understood that when the screws I4 and I5 are loosened transverse adjustment of the upper end of the plate may be effected about the axis of the stud IT byturning the stud I9 in the longitudinal slot l8. Similarly lengthwise adjustment of the plate ll may be effected by turning the stud I! and in this adjustment the slot l8 provides suflicient Fig. 2 is a viewin longitudinal section on the I line 22 of Fig. 1;

Fig. 3 is a view in longitudinal section on the line 33 of Fig. 7; and

Figs. 4 to '7 are diagrammatic views showing the motor parts in various positions of adjustment.

The motor is herein shown in its application in its bottom providing fiat lands at-each end and these serve as a seat for a non-metallic base plate II. The base plate has a rectangular body portion provided with a rectangular notch l2 in its left-hand edge, as'shown in Figs. 4-7, and merges in its upper portion intoan oblique extension IS. The plate is adjustably held in place within the casing section In by two screws I4 and I5 located in the major axis of the plate and having large heads which cover clearance clearance for longitudinal movement of the plate with respect to the stud I9.

The motor includes in its structure an electromagnet having a laminated field core 20 which, as herein shown, may be riveted or otherwise fastened to the base plate II. The field core is substantially E-shaped, having transverse arms at both ends and an intermediate arm upon which is wound the coil 2|. The armature 22 is mounted at one end for rocking movement upon the edge the field core .to maintain the armature against displacement in any direction. The free end of the armature is separated from the upper branch I of the field core by a bias gap which it is apparent may be less in width than the stroke of the armature. The field core 20 andthe armature 22 are each provided with a downwardly extending ear which is located below the fulcrum point of the armature. These ears are engaged by a C-shaped spring 2! which thustends at all times to swing the upper end of the armature outwardly, or toward the left as hereinlshown, andaway'from the upper arm of the field core to open the biased gap between the two.

. armature and core.

extended upwardly beyond the body of the armature to provide secure anchorage for a forked connector member or coupling 25 which may be moulded of Bakelite or other insulating material. One arm of the forked member 25 is disposed substantially in line with the major axis of the electro-magnet and carries the upwardly'extending operating arm 26 by which the vibratory movement of 'the motor is transmitted to the driven member of the dry shaver. This is shown diagrammatically in Figs. 4-7as a toothed cutter bar 21 and this cutter bar is arranged to co-operate with the shearing teeth 28 of the stationary member of the cutter head.

The outer arm of the forked member 25 is extended to embrace an eccentric assembly comprising a screw 30 threaded into the oblique arm l3 of the base plate and surrounded by an eccentric sleeve3l which in turn is enclosed in a rubber sleeve 32. The latter limits and silently cushions the stroke of the armature 22. The optimum adjustment of the armature stroke is that in which the biased gap is substantially closed but without actual impact between the Closing of the gap is desirable because magnetic loss is thereby reduced cluding the eccentric assembly upon the screw 30. On the other hand the adjustment eflfected by the eccentric 3| is in respect to the armature I alone and is carried out independently of the to the minimum in the motor and yet actual 6 and 7 with a corresponding intermediate opening of the gap. v

The transverse adjustment of the motor together with its operating arm 26 and the cutter 21 is suggested in Figs. 6 and 7 where the eccentric stud I9 is shown in two positions at 180 apart with respect to each other and the cutter 21 is shown in the corresponding relation to the stationary shearing teeth 28. The longitudinal adjustment of the motor and its operating arm 26 is suggested in Figs. 4 and fiwhere the eccentric stud H is shown in two positions 180 apart and the variation in the relationship of the operating arm 26 to the cutter is correspondingly indicated.

It will be understood from the foregoing description that the base plate ID has provision for two separate adjustments that may be efi'ected singly or simultaneously and that these adjustments arein respect to the complete motor, in-

adjusted position of the motor as a whole.

Certain features, herein disclosed in order to facilitate a complete understanding of the invention, are not herein claimed since they are also disclosed in the motor of my prior application, Ser. No. 316,498, filed January 31, 1940, and are claimed in that application. Herein I claim as new and desire to secure by Letters Patent:

1. A motor for dry shavers or the like, comprising a casing, a base plate adjustably secured thereto, separate eccentric connections between said plate and easing whereby the plate may be shifted in directions at an angle to each other in the casing, a laminated field core secured to the plate, a movable armature mounted thereon and having a bias gap with respect to the field core, and means carried by said plate for adjustably limiting the path of movement of said armature and the opening of said gap.

2. A motor for dry shavers or the like, comprising a casing, an elongated base plate adjustably secured thereto and having awlongitudinal slot and atransverse slot thereinQa stud in each of said slots having an eccentric body portion ro-- tatably seated in the casing, a field core fast to said base plate, and a vibratory armature mounted thereon and carrying the driven element of the motor.

3. A motor for dry shavers or the like, comprising a casing, an elongated base plate mounted therein and having an obliquely disposed arm at one ehd, an E-shaped field core fast to said plate, a vibratory armature mounted at one end on the lower arm of the field core, carrying at its other end a forked connector member and making a bias gap with the upper arm of the core, and an eccentric stud projecting from theobliquely disposed arm f the base plate into the embrace of said forked member in position adjustably to regulate the openingof said bias gap.

4. A motor for dry shavers or the like comprising a base plate, an electro-magnet having a core secured to said plate, a vibratory armature mounted at one end on said core and separated therefrom at the other by a. bias gap, a forked member carried by the armature, and an eccentric stud adjustably mounted in the base plate and having a yielding portion disposed between the arms of said forked member to regulate and cushion the stroke of the armature.

JOHN A. HANLEY.

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