US1040576A - Dental engine. - Google Patents

Description

0. H. & A. F. PIEPER.

DENTAL ENGINE.

APPLICATION FILED MAILZ, 1910.

1,040,576. Patented 001;. s, 1912.

2 sums-81mm 1.

ym; 1 aqwsnm 0. H. & A. F. PIEPER.

DENTAL ENGINE.

APPLICATION TILED MAR. z, 1910.

1,040,576. Patented Oct. 8, 1912.

2 SHEETSSHEET 2.

ZM/ 35 w UNI D" STATES PATENT OFFICE.

OSCAR H. tPIEP-ER AND ALPHONSE F. PIEPER, 0F RQCHESTER, NEW YORK,

DENTAL ENGINE.

Speciflcation of Letters Patent.

Application filed March 2, 1910. Serial No- 546,768.

To all whomz'tm'a concern:

Be itv known t at we, OSQAR H. Pmren and ALPHONSE F. PJEPER, both of the city of Rochester, county of Monroe, and State of New York, have invented certain new and useful Improvements in Dental Engines; 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 the referencenumerals markedthereon.-

The present invention relates to dental engines and it has for an objectto provide av construction in which the motor. is so arranged that. it acts as a counterbalance for the supporting arm, while at the same time fitsweight. is so disposed that it does not interfere with the turning of the supporting arni about a vertical axis. a

f Another object of the invention is to provide .an -i mproved-supporting arm formed ofielescopingmembers so constructed that binding. action between the members, interfering with-their free operation, is obviated.

To' these and other ends the invention con.- sists in certain improvements and combinations of parts all as will be hereinafter more fully/described, the novel features being pointedout in the claims at the end of the specification.

In' the drawings: Figure 1 1s a side view of. .the en 'ne with the supporting arm thereof ralsed to its uppermost position; Fig. 2 is a detail top view of the engine with the supporting arm partially broken away; Fig. 3 is. an'enlarged side view of the engine with parts in vertical section, apart of the supporting arm being removed Fig. .t-is'a detail View of the supporting arm in proximity to the joint between its members;

Fig. 5 is asection on the line aa of Figg i;

Fig. 6 is a section on the line bb of 4; Fig. 7 is a section on the line 0-0 of Fig. 4; Figs. 8 and,9 are vertical sections of the buffer employed for retarding the motor or counterbalance near the latterart of its :movement; Fi 8 being a sectlon-on the line al--d of Fig. 9, and Fig.9 being a sec taching member or bracket 1- aving; upper other and lower arms 2 on which turns aframe 3, removable bearings 4 for this purpose being provided on the arms 2 to cotiperate with bearing recesses in the frame 3 so that the latter may swingabout the vertical axis. The frame 3 is provided with a pair of parallel arms 5 between which is pivoted fat 6 on a horizontal axis the supporting arm ior member of the engine. The supporting larm in this instance comprises apivot memlber 7 formed of a single castin lvided at one side with. a shoul er 8 .from fwhich projects integral pins or projections 39. These pins or projections are detachably engaged by the inner end of the inner member of the supporting arm, the latter pref- {erably comprlsing two tubular rods 10 fitted {over the rojections 9 and connected at their ginner en s b a member or plate 11 which has two hol ow bosses 12 secured thereto {and to the tubular rods 10. The plate 11 rests against the shoulder 8 and is held ,in such a position by any suitable means. In the present instance a thumb screw 13 passes through the plate 11 and engages screw threads on the walls of the opening 14 in the pivot member 7.

The outer ends of the tubular rods 10 are preferably connected by a member 15 in the'form of a yoke provided with a guide having tapering wal s 17 and its axis extending in a line between the rods 10 to receive the outer member 16 of the supporting arm. Fitted within this opening and about ,the member or rod 16 is a sleeve 18 split at 19 and having its inner ends tapered to.

packing ring 21 into engagement with the tubular rod 16. The inner diameter of the sleeve 18 is much larger than the external diameter of the tubular rod 16 so that the latter lies in spaced relation to the inner walls of the sleeve and the nickle lating or olished surface of thetubu lar rod is not a ected by the telesco ing movement. Arranged to engage the en of thetubular rod 16, there is provideda member 22 hav-- Patented Oct. 8, 1912..

and proing an exteriorly threaded boss 23 fitting the rod 16. This member may carry two guides 24 through which the rods 10 travel, and the guides 24 are provided with pockets 25 to receive packing which prevents the abrasion of the surface of the tubes 10, jam nuts or bushings 26 holding the packing in position.

At the outer end of the member 16 is provided a pendant arm 27 carrying a handpiece connecting-arm 28 which has at its outer end the hand-piece 29. The latter is driven by an endless cable 30 which passes from a pulley on the shaft of the motor 31, (supported in a manner to be hereinafter described) over pulleys 32 supported in rear of the turning axis 6 on arms '33 lying on the outside of the frame arms 5; one strand of the cable passing directly to one of the pulleys 34 at the outer end of the supporting arm, thence to one of. the pulleys 35 to the tool pulley 36; the other strand passing about a pulley 37 on the inner member 10, thence about a pulley 38 on the inner end of rod 16 and then successively to the. pulley 34, the pulley 35 and the pulley 36, this arrangement permitting the telescoping of the supporting arm while maintaining the driven cable taut. The pulley 37 is pref erabl supported on one side of the bracket 39 W ich surrounds the rods 10 and 16 and I is held to the rods 10 by a clamping screw40,

. end the frame 3, on which-the motor is sup a retaining device 41 being provided on the bracket 39 to prevent the cable leaving the pulley. The pulley 38 is supported on one side of the rod supporting member 22,-the' cable being retained on the latter by a guard 42 pivoted at 43 and yieldingly held in either of two positions by a spring pressed ball 44 entering notches in the guard 42.

The motor for driving the "hand piece is preferably movable vertically and to this ported, is of yoke formation, its arms being provided on their opposed faces with guideways 45 receiving guide projections 46 which, in this instance, are resilientlysupported in soft rubber cups 47 from themotor, the resilient cups acting as insulators and preventingt-he vibrations of the motor being transmitted to the frame 3.

In. order that the. motor may counter balance the supporting arm connectionbetween the latter and said motor is provided. Preferably this connection is in the'formof a sector-shaped or segmental rack 48 formed integral with the pivot member 7 and meshing with a straight rack 49 which is resiliently connected to the motor 31 byasoft rubber thimble 50, also serving as an insulator betweenthese parts, he the supportin'g arm approach s a" vertical pos tion,

I h w in Fig.1, it exerts a constantly do creasing resistance to the action of the n un terbalalnce'oiifmotor, and after it has-passed t eatre lid on the swinging frame 3 between the arms I 5 of the latter. The abutment 51 normally lies in engagement with the stop 55 being held thereagainst by a spring which, in this instance, is in the form of a true spiral 56 arranged within the drum 54 and having 7' one end secured at 57 to the drum and the other end secured to the sleeve 58. The latter is rotatable in. the side walls of the drum and is supported upon a pin or bolt 59 which connects the arms 5 of the frame 3. The bolt 59 is preferably provided with a longitudinal slot receiving a pin 60 in the sleeve '58 to hold the latter-against rotation, the bolt in turn being held against rotation by a pin 61 secured to the frame 3 and received also within the slot. It is apparent thatathe bolt 59 may be withdrawn out of engagement with the pin 51 and rota to'turn the sleeve 59 in, order that the tension'of the Es'prin 56 may be varied the pin 61 serving :to ho d the bolt in its 2M? position.

g The operation of the'engine be apparent to those familiar with these machines,

but it may be stated generally that the new :ing of the supporting arm' edects, throu h the racks. 48 and 49,.the elevation of t e motor 31 which soacts on the arm to coun:

terbalance the latter. .Qf' coursewhen the supporting arm is lowered the hand piece,

through the arms 27- and 28, ma assume any position, the turning of'the ame- 3' also assisting in .thepositloni-ng. en the su jpo'r'tlng arm isagain moved upwardly, t e

abutment 52, toward the latter part of the downward movement of the motor, engages the abutment 51 onthe retarding device. or; mg

suddenly to an upright osition; itl'being,

apparent that the lighter ecomes the ede'ct' .bufier, thus preventing the bei-n 'moved of the arm the greater becomes the "cushion;

efiect of .the buffer so that the'counter- [-ba ancing efiect is still maintained. From the foregoing it will be seen" that there has been rovided a supporting arm 1n which the frictional contact between the two telescoping members has beenreduced' to a minimum so that the chances ofbinding have also been reduced. The motor isso po-:

its

lsitioned that the machine does'not-require agreatdeal of space ,forinstallationand the 1 weight of the .motor is so disposed that "it docs not'materlally afiect the turningpfthe turn on the frame about a horizontal axis, a

hand piece carried by the supporting arm, a counter-balance mounted in said frame, means carried by the counter-balance having positiveengagement with the supporting arm, and means for guiding the counterbalance vertically in the frame.

2. In a dental engine, the combination with a frame mounted to turn about a vertical axis, of a supporting arm mounted to turn about a horizontal axis on the frame, a

hand piece on the arm, a counterbalance mounted in the frame, means guiding the counter-balance vertically on the frame, a sector shaped rack on the arm concentric with the axis, of the latter,

- rack on the counterbalance meshing with the sector-shaped rack.

3. In a dental engine, the combination with a frame mounted to turn about a vertical axis and provided with vertical guideways, of a supportin arm mounted to turn about a horizontal axis on the frame, a hand piece on'the arm, a motor for driving the hand piece, guide projections resiliently carried by the motor and 0 crating in the ver tical guideways of the rame, driving connection between the motor and the hand piece, and means operativel connecting the motor and the arm where y the latter is counterbalanced by the former.

i. In a dental engine, the combination with a frame mounted to turn about a vertical axis, of a supporting arm mounted to swing about a horizontal axis onthe frame,

a hand piece supported b the arm, a mo-' tor vertically movable on t e frame for driving the hand piece, a sector-shapedv rack on the arm concentric with the axis of turning of the latter, a straight rack resiliently connected to the motor, and a driving connection leading from the motor and connected to the hand piece. 1

5. In a dental engine, the combination with a yoked frame having guideways on its arms and mounted to turnabout a vertical axis, of an arm mounted to swing onthe frame about a horizontal axis, a hand iece supported by the arm, a motor for the hand piece mounted in said frame, guide projections resiliently carr ed by opposite sides of the motor and cooperating with the 'uideways on the frame so that the motor is alined with the axis of turning of the frame, a sector-shaped rack on the arm, a

straight rack on the motor resiliently conand a straight therefor, of a leading from the motor to the hand piece,

"member driving nected to the latter, and a driving connec tion leading from the motor and connected to the hand piece. a

6. In a dental engine, the combination with a frame, of a supporting arm mounted to turn about a horizontal axis on the frame, a hand piece carried by the supporting arm, a motor slidably mounted upon the frame and having a connection with the supporting arm whereby to counter-balance the same, and driving connections between the motor and the hand piece.

7. In a dental engine, the combination with a hand piece and a supporting a'rm therefor, of a motor, means for guiding the motor vertically, counter-balancing connections between the motor and the supporting arm, a driving cable leading from the motor and connected to the hand piece, and a pair of pulleys located in the rear of the turning axis of the arm and having the driving cable passing thereover toward'and from the hand piece.

8. In a dental engine, the combination with a supporting arm mounted to turn about a horizontal axis, of a hand piece carried by the arm, a motor for driving the hand piece mounted in the frame for vertical movement and having connection with the supporting arm whereby to counter-balance the latter, an elastic buffer for retarding the movement of the latter, and a driving connection leading from the motor to the hand piece.

9. In a dental engine, the combination with a hand piece and a supporting arm therefor, of a motor, a driving connection leading from the motor to the hand piece, the supporting arm embodying a pivoted member having projections extendingtherefrom, a member formed of tubes fitting the projections, a plate connecting the tubes, and means for securing the plate to the pivoted member.

10. In a dental engine, the combination with. a hand piece and a supporting arm motor, a driving connection the supporting arm embodying a pivoted having projections extending therefrom and a shoulder at the base of the proections, of a member comprising two tubes fitted to the (projections, a plate connecting the tubes an abutting the shoulder, and a screw for holding. the plate against the shoulder; r j i 11. In a dental engine, the combination with a hand piece and a supporting arm therefor, of a motor, a driving connection leading from the motor to the hand piece,

the supporting arm embodying an inner member including a pair of rods, a connecting device at the'outer ends of the rods, an outer member arranged for movement in the connecting device and having guiding means i eee ete end e, pecking ring held by the split eieeve end eomphessed upon the test mentioned memhei' hy the tapered Wells.

13.. In it dentei engine the comhinetien with e frame monnmd to tune ehent e V1T- mentioned member and entieei axis of e supporting me mounted to turn on the theme about t horizontal exis e. hand pieee carried by the supporting am, it counterhaience mounted 1n the frame, means operatively connecting the counterbalance with the supporting arm eomprising-e curved toothed surface on ene of the parts in engagement with e correspondingly toothed plane surface on the other part, and V meens for guiding the counter-balance ver- I tieeiiy in the frame.

@SCAR H. PIEPER. ALPHQNSE F. PIEPER.

Witnesses:

Rneenm B. Gent-"me LUCY A, VAN Count,

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