US2867737A

US2867737A - Tuning means for vibrator motor

Info

Publication number: US2867737A
Application number: US596691A
Authority: US
Inventors: Bylund Eric
Original assignee: Schick Inc
Current assignee: Schick Inc
Priority date: 1956-07-09
Filing date: 1956-07-09
Publication date: 1959-01-06
Anticipated expiration: 1976-01-06

Description

Jan. 6, 1959 E. BYLUND 2,867,737

TUNING MEANS FOR vxRAfroR MOTOR Filed' July 9, 195e NVENTOR 'R'lc Y1. UND

NEYS

United tas 2,867,737 TUNING MEANS FOR VIBRATOR MOTOR Eric Bylund, Lancaster, Pa., assignor to Schick Incorporated, Lancaster, Pa., a corporation of Delaware Application July 9, 1956, Serial No. 596,691 4 Claims. (Cl. S10-19) This invention relates to small magnetic vibrators of the kind sometimes used for actuating electric Shavers.

Such motors are usually attached by hold down screws to a suitable base which, commonly, is one half of a plastic molded case which carries the shearing head of the shaver, the head consisting of a stationary cutter and a movable cutter which is reciprocated by the armature of the vibrator motor.

The proper tuning of such a vibrator motor for most effective operation can be reliably accomplished only when the motor is under load, that is, coupled to and driving the inner cutter, which means that it needs to be tuned after the motor unit and shaver case have been substantially assembled.

The present invention has for its object the provision of simple, reliable means whereby such tuning can be readily accomplished.

Generally speaking, the invention is, in a vibrator` structure of the kind including a base, a magnetic vibrator unit attached thereto and including an armature, a leaf spring supported at one end on the said unit and having its other end connected with the armature and establishing its at-rest position in relation tothe poles` of the unit, the improvement which comprises means for clamping a part of the spring remote from its said other end to the base independently ot the attachment of the unit to the base and in different positions of adjustment to vary the setting of the spring and armature in relation to the unit.

The invention will be readily understood from the following description of the accompanying drawings of which:

Fig. l is a front elevation of a vibrator unit and base incorporating the preferred form ot the invention;

Fig. 2 is a broken out view of a portion of Fig. l showing the parts in a different position of adjustment;

Fig. 3 is a section on the line 3 3 of Fig. l; and

Fig. 4 is a perspective view of an adjustment tool.

The vibrator unit 1 shown for purposes of illustration includes an armature 2, poles 3, 4 (Fig. 2), coil 5 and armature spring 6. One end of the latter is connected to the armature and its other end is supported on the motor unit. In this form such support is afforded by a yieldable bracket 10 which forms an extension of a plate 11 riveted to the eld structure. The armature has an extension 12 carrying a head 13 which is engaged with the inner cutter 14 of shearing head 15. The details of the latter are of no consequence so far as the present invention is concerned, it being understood that when the coil is energized (either by alternating current or by direct current through a suitable make-and-break device) the armature oscillates and reciprocates the inner cutter through extension 12 and head 13.

In the illustrated construction the base 16 to which the vibrator unit is shown secured by hold down screws .20 is not the usual shaver case but is a rigid cradle strucy iture which, per se, forms no part of the present invention.

2,867,737 Patented Jan. 6, 1959 ice As will be understood, however, the invention is indifferent to whether the base is such a cradle or a conventional shaver case section.

According to the invention, as previously stated, means are provided for clamping a part of the armature spring, remote from the end attached to the armature, to the base in various positions of adjustment. Such means are arranged to ilex the bracket 10.

Specically, the bracket is provided with a laterally extending tab 21 overlying a portion of the base and having a slot 22 which is located to expose a pilot hole 23 in the base. The tab 21 is provided with a second slot 24 adapted to pass a clamping screw 25 which, when tightened, holds the tab securely against movement relatively to the base.

To adjust or time the vibrator screw 25 is loosened. A suitable tool having an eccentric pin 27 to enter the pilot hole and a cylindrical body 28 to it the smaller dimension of slot 22 is inserted in the slot and, of course, rotation of the body of the tool forces the tab to right or left. When the desired setting is arrived at the screw 25 is tightened and the adjusting tool removed. An extreme position of such adjustment is shown in Fig. 2 for purposes of illustration.

The following is claimed:

l. In a vibrator structure the combination of a base, a magnetic vibrator unit attached thereto and including an armature, a leaf spring supported at one end on the said unit and having its other end connected with the armature and establishing its at-rest position in relation to the poles of the unit, and means for clamping a part of the spring remote from its said other end to the base independently of the attachment of the unit to the base and in diierent positions of adjustment to vary the setting of the spring and armature in relation to the unit.

2. In a vibrator structure of the kind including a base, a magnetic vibrator unit attached thereto and including an armature, a leaf spring connected at one end with the armature and at its other end mounted on a yieldable bracket secured to the unit, the improvement which comprises means for ilexing said yieldable bracket to vary the setting of the spring and armature and means for locking the bracket to the base independently of the attachment of the unit to the base.

3. In a vibrator structure of the kind including a base, a magnetic vibrator unit attached thereto and including an armature, a leaf spring connected at one end with the armature and at its other end mounted on a yieldable bracket secured to the unit, the improvement which comprises a laterally extending tab attached to said bracket and overlying a portion of the said base, means for adjusting the position of the tab and hence the bracket and spring and means for clamping the tab to the said portion of the base.

4. In a vibrator structure of the kind including a base, a magnetic vibrator unit attached thereto and including an armature, a leaf spring connected at one end with the armature and at its other end mounted on a yieldable bracket secured to the unit, the improvement which comprises a laterally extending tab attached to said bracket and overlying a portion of the said base, said portion of the base having a pilot hole and said tab having a slot exposing the pilot hole, said hole and slot adapted to receive an adjustment tool for adjusting the position of the tab and hence the bracket and spring, and the tab having a second slot for the passage of a clamping screw for locking the tab to the base in its adjusted position.

References Cited in the le of this patent UNITED STATES PATENTS 1,589,027 Wahl June 15, 1926