US651469A - Dental motor. - Google Patents

Description

Patented June [2, I900.

No. 65l,469.

' U. H. & A. F. PIEPER.

2 Sheets-Sheet I.

(No Model.)

0. H. & A. F. PlEPE-R. Patented DENTAL. MOTOR. (Application filed Mar. 1, 1900.;

2 Sheets-Sheet 2.

(No Model.)

' l i'TED STATES OSCAR H. PIEPER AND ALPHONSE PATENT O FFICE.

PIEPER, OF ROCHESTER, NElV YORK.

DENTAL MOTOR.

SPECIFICATION formingpart of Letters Iatent No. 651,469, dated d'uli 12, 1906. Application filed Mar hll 1900.: Serial No. 7,002. (No model.)

To all whom it may concern:

Be it known that we, OSCAR H. Pierce and ALPHONSE F. PIEPER,Of Rochester,New York, have invented certain new and useful Im;

provements in Dental Motors; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to [o the reference-numerals marked thereon.

Our present invention relates to motors,par-' ticularly for operating small hand-tools, such as used by dentists, which are manipulated by the operator to grind, drill, or polish and are therefore necessarily capable of universal movement to operate in the most convenient manner; and it has for its object to prof vide means whereby the motor may be sup: ported in convenient manner and all the neozo essary movements may be given the tool or handpiece and the latter held within conven: ient reach of the operator atall times.

To these ends the invention consists in certain improvements and combinations of parts,

2 5 all as will be hereinafter fully described, the novel features being pointed out in the claims at the end of this specification.

In the drawings, Figure 1 is a perspective view of a motor and connected parts; Fig. 2, a sectional view on the line a a of Fig. 1; Fig.

3, a sectional view on the line b b of Fig. 2; Fig. 4, a sectional viewonthe line 0 c of Fig. 5; Fig. 5, a sectional view on the line d d of Fig. 4; Fig. 6, a sectional view on the line e e 3 5 of Fig. 4. Y

Similar reference-numerals in the several figures indicate similar parts.

We have shown our invention as applied to a motor operated by electricity and prefer this by reason of the simplicity and facility of connection and operation, although any other suitable motor could be employed embodying a casing capable of being supported in the same manner.

In devices of this general description it is desirable to support the motor or tool-operatin g device in such relation to the dental chair that the tool or handpiece may be within convenient reach of the operator and at the same time be normally held out of his way, and we therefore attach the main holding bracket or support 1 to a stationary support 2, which maybe the wall of the room or a standard especially provided for thepurpose. This bracket orsupport 1 preferably embodies a base OI Plateprovided with two horizontallyextending arms 3, inwhich the motor-frame i is journaled to swing laterally on a vertical center. The motor may be of any suitable construction; butwe prefer to employ an electric motor, such asshown, the annular frame'4 of which constitutes a magnet composed of plates clamped between rings 17, provided with pole-pieces 15, having coils 16 thereon, and between which rotates an armature 5 on a shaft or arbor 6, journaled in a bearing-yoke 66 at one end and at the other in a bearing in a tubular extension 7, supported mediately on a casing or cover-plate 8. The motor-frame tis provided at top and bottom with blocks of non-resonant material,

the rings are metal bearing-collars 11, adapted to rotate freely in the apertures in the vertically-arranged arms 3, whereby the mo tor may turn freely on a vertical axis, while the rubber blocks relieve the support from jar and deaden the sound when the motor is in operation. One side of the motor is covered by the hemispherical plate 12, secured bya nut 13 on the armature-arbor yoke 66, a felt washer being interposed between the parts, and a larger washer or packing-ring 14:, provided between the larger end of the cover and the annular frame, prevents the entrance of dust and deadens the sound. The side of the motor-frame opposite the yoke is provided with the coverplate 8, having the tubular extension 7 formed or secured at the center thereof, said plate 8 being secured to the magnet-ring 17 by screws 18 or otherwise. A suitable felt washer 19 is arranged between the edge of the plate 8 and themaguet to exclude dust and deaden the sound. Surrounding-the armature-arbor is a bearing-sleeve or bushing 20, secured in the extension 7, which latteris slotted or cored out, the lower sides of the lower slots being inclined toward an oil-cup 23, from which oil or lubricating material is supplied to the bearing by a wick 22, extending into the oil-cup on the lower side of the such as soft-rubber blocks or packing-rings 9, secured by headed screws 10, and around extension 7,.as shown in Fig. 4. The inclined slots or recesses serve to return to the oilcup any oil escaping at the ends of the bearing.

2& indicates a split collar adjustably clamped by a screw 25 upon the outer reduced portion of the extension 7 and provided with a flange 26, between which and a collar 27 is arranged a disk 28, formed with or carrying a radius arm or bar 29. The collars 24 and 27 are prevented from movement longitudinally of the extension by a screw 30, passing through the collar 27 and entering an annular groove 31, as shown in Figs. 4am 5.

2 indicates a belt-pulley on the end of the armature-shaft, from which power is communicated by a belt 33 to the tool 45.

The disk 28,wh-ich is, in elfect, a part of the radius-arm, turns on a center concentric with the driving-shaft of the motor andis provided with a pin 34, to which is connected one end of a volute spring 35, the other end of the latter being connected to the collar'24i by entering a recess therein, whereby the spring will tend to raise the radius-arm 29 and hold itagainst the uppermost of a pair of stop-pins 36 on the plate 8, although the arm may be moved downwardly against the tension of the spring when desired. The spring serves to slightly more than counterbalance the radiusarm and connected parts, so'as to permit free movement with very slight exertion, :but to return the arm to upper position when the tool is released.

57 indicates a bracket hinged at 38 to the upper end of the radius-arm 29 and provided with belt-pulleys39, over which the belt 33 passes, said pulleys being loose upon an arbor 40,asshown in Fig. 2, and 37 is an arm or rod connected to the bracket, so as to turn axially therein. At the lower end of the arm 37 is provided a loose guide-pulley 41 and also a pivoted handpiece 42, having a guide-pulley and a tool-shaft 43, to one end of which 'latter a driving-pulley 44 is connected and at the other end a tool 45, as shown. The par-. ticularstructure of the arm 37, the-handpiece, and the connected parts form no part ofour present invention, the construction shown being similar to a universally-movable handtool now on the market, and these parts may be *of any suitable or desired construction, it being sufficient that thedriving-belt extending'from the pulley 32 to the pulley 42L on the tool-shaft in the handpiece be kept reasonably taut, the tool effectively driven, and a universal adjustment permitted the handpiece. When the hand piece is not in use, the

arnr37 is engaged by a hook 46on an arm a7,

ad'gjustably secured to the radius-M11129, as

shown in Fig. 1, out of the way of the operator, but within convenient reach.

The current for operating the motor may be supplied through suitable flexible conductors 50, entering the frame through the coveri plate 8, as shown in Fig. 1, or any other power could be employed in any other manner that would notprevent the free movements neces sary.

The motors, constructed and supportedas described, being centrally pivoted occupy but little room, are permitted a free movement on a vertical axis, and the radius-arm 29 and connected parts, while normally supported and held against the stop 36 by the spring, (which latter serves to slightly more than counterbalance the weight of the parts,) can be moved by the manipulation of the handpiece into any position to accomplish the work desired in the most convenient manner, the latter being permitted a universal movement, as will be understood.

We claim as our inventiona 1. The combination with the supportingbracket, the motor-frame pivoted at topand bottom to the bracket to swing in a horizontal plane, and having the tubularextension and the shaft operating in the extension, of the radius-arm movable around the extension, and-the spring connected tothe extension and arm for elevating the latter.

2. The combination with the motor-casing having the tubular extension at the side,and the rotary shaft operating in the extension, of the radius-arm movable around the extension, and the spring connected to the extension and arm for elevating the latter.

3. The combination with the 1notor-casing having the tubularextensionat the side, and the rotary shaft operating therein, of the sleeve adjustably secured upon the'extension, theradius-arm pivoted upon thesleeve, and the spring connected to thesleeveand arm for supporting the latter.

4:. The combination with the motor-casing section provided withthe tubular extension and the stops, and the rotaryshaft operating in the extension, of the sleeve on the extension, the radius-arm thereon operating 'between the stops, and the spring connected to the sleeve and arm for holding the latter in engagement with the upper stop.

5. The combination with a support, the=an= nular motor-frame having the pivots at top and bottom journaledin thesupport, and the tubular extension at the side, of the rotary shaft operating in the extension having the belt-pulley, the radius-arm turning on the-extension, and the spring for raising said arm.

6. The combination with the supportingbracket having the perforated arms, of the motor arranged to turn between said arms having the oppositely-arranged flanged blocks of non-resonant material secured thereto and the flanged bearing collars fitting around the blocks arranged to turn i'nthe perforations in the bracket-arms.

7. The combinationwith the supportingbracket 'having the horizontal arms provided 'with vertical perforati0ns,of the=motor-frame arranged between said arms and provided with the flanged blocksof non-resonant maporting it, the arm connected to the free end of the radius arm, a handpiece connected thereto, a rotary shaft in the handpiece, a belt extending from themotor-pulley and to the r 5 handpiece, and guide-pulleys for the belt.

OSCAR H. PIEPER. ALPHONSE F. PIEPER.

F. F. CHURCH,

Witnesses:

G. WILLARD RICH.

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