US1853089A

US1853089A - Angle dental handpiece

Info

Publication number: US1853089A
Application number: US515286A
Authority: US
Inventors: Perry R Skinner
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-02-12
Filing date: 1931-02-12
Publication date: 1932-04-12
Anticipated expiration: 1949-04-12

Description

Aprl 12, 1932. P. R. SKINNER ANGLE DENTAL HANDPIECE Filed Feb. l2, 1931 Patented, Apr; `12; A1932 PATENT- maar nrsxmnnnron AMSTERDAM, NEW roms AirmanV :DENTAL Hannrrncn Applicatonjled February'lZ, 1981'. Serial-1X0` 515,2862

Thisfinvention relates to means for detach: ably connecting a tool to an angle dental handpiece.

In devices for kthe purpose as. commonly cause the usual fastening means is attached 10 to a non-rotatable part of the handpiece, and projectsinto a Icircumferential groovein theV rotating tool or otherwise,enga-ges theA tool, Consequently,.after any considerable use, the securing 'means' becomes Worn by'reasOn.v Of

*i5 frictional' Contact With.` the tool", thetooll is less rigidly held, and finallythe Securing means becomes inoperative. Any: loosening ofthe tool in its holder allows of= 1nore or less Wabbling of the tool and impairs its effectiveness, and frequently in practice, be-

causeof 'the Wearing out` ofi 1 the attaching means, a tool is released inthe mouth .ofva patient being oper-ated upon, and there: is vdangerof the tool lodging in; the. throat Of the patient or of being swallowed;l

The principal object of thezpresent inveliF Y tion isl to providemeans: forfdetachably Securing-a; tool in: an. angle dental handpiece, whereby When infuse/the tool isi directly Secured4 toy the parts by which thetool isI ros tated, thusk dispensingwith any intermediate device uponwhichfri'ctionis imposed. Furf ther objects are to, provide atta'chingmeans of the kind described in which a tool may be either secured or released, by easy and rapidey manipulation of the parts employed, and which is adapted. for use in connection with tools vhavingthestandard formof shank. Another object is to provide attaching means yWhich shall positively engage a. tool', When the latter is in position for use, in a manner to avoid accidental Withdrawal ofthe tool;

The invention residesin the various'genel# cally and specifically novel featuresof construction and arrangement of parts substantially as hereinafter described and claimed. One form of'embodiment of the invention is illustrated in the accompanying drawings. Figurel is a lcentral vertical sectional view 59 of theyhead 'of' an angle handpiece,` having therein thenovel meansafol'. attaching a tool, atool being: shown inattached position.

Y Figure@ isa top planvievv of a head, showing the4 cap ley-Which the attaching means is released. .f f

Figure Sis a perspectiveview of the rotat ablesleeve through which extends a cylindrical clutch by which a tool is detachably held, the sleeve having a bevel gear thereon.

y AFigurel is a; side view of the cylindrical clutchbyy-Which atoolis received and detachably held.

.Figure 5 is' a kside View. of a dental tool Y having a: shank. of the standard form.

Figurel (iis aA side view: of a mandrel of a. form; to be engaged bythe improved attaching means.

Y Figure 7 fis a viewshowing a modified form of the top of the clamping member.

In thediavvings the head of,` a dental angle handpiece isindicated by 1 and 2 indicates the usual rotatable sleeve,L ymounted in the head, and Which has,vusually integral with it, apbevel pinion. Rotation of the sleeve is effected through aL bevel gear t, suitably driven, and meshing-With the pinion 8. EX- tendingintothe sleeve is aproj ection 5, Which engages a tool receiving and engaging member? 6. when. thelatter is in position to extend *through the sleeve, to cause the tWo parts to notate in unison. f e l The tubular member 6, which in usel is located in andprojects through, the sleeve 2, is made of'resilient metal, is provided With the slot 7 `which extends from end to end ofthe member, receivingthe projection 5 from the ycollar-2, and which also is provided at one end withk one or more slits 8 `which permit of the easyvexpansion and contraction of such end. This slotted endV isin'ormally flaring in order to permit of the ready introduction of the shank 9 ofthe toollO, andy it terminates in an enlargement 'or-collar' 1l Which abuts against f Vthe lower end of the rotatablesleeve `2 to limit `the movement of thetubular member 1 upwardly through the sleeve.

The shank 9 of the standard dental tool is abruptly reduced at its operative end, forme ing a circumferential shoulder l2., In complement with this-,form of shank the extreme end of the clamping member 6 is formed with inwardly extending lips or extensions 13, which project substantially at right angles to the inner face of the member. The relative disposition ofthe respective parts is such that when a tool is introduced into the handpiece, in a position for use, the lips or extensions of the clamping member, when in engaging locations, assume positions immediately below the shoulder 12 of the tool shank,

and thus positively secure the tool in a man-kr ner to prevent withdrawal.

A dental mandrel, such as shown in Figure 6, which usually has a smooth cylindrical shank, can readily be adapted for use in connection with the described securing means by providing it with a circumferential recess 111, so located as to be entered by the lips or extensions when the mandrel is operatively introduced into a handpiece.

Interposed between the rotatable sleeve 2 and the cylindrical member 6 is a spring 15 the function of which is to maintain the parts in the positions shown in Figure 1 of the drawings; that is, with the member 6 drawn into the sleeve in a manner to contract the flaring end of such member. Any suitable form of spring may be used for the described purpose, and it may be disposed in various positions. As herein shown, it is in the form of a coil, one end of which bears on the upper end of the sleeve 2 and the other end against the lower face of a disk 16 suitably secured to the upper end of the member 6. The disk has a central opening receiving the member 6, and is held in place by a pin 17 passing through the upper portion of the wall of the member, and having its projecting ends bearing on the upper face of the disk. In placing the spring in position, it is put under tension by compressing it, in order that it may function normally to maintain the member 6 in a position with its lower end drawn into the sleeve, and, therefore, contracted.

When it is desired to move the flaring lower end of the member 6 downward to free it from the sleeve 2 and permit such end to expand, it is necessary to apply a small amount of force to the upper end of the member to overcome the tension of the spring 15. As a convenient means of accomplishing this movement a cap 1S having a spring arm 19 is secured to the head 1 kof the hand piece by a screw 20, extends over the upper end of the member 6, and contacts with the latter.

The cap 18 not only serves when depressed to give the required movement to the member 6, but also covers and protects from dirt the upper end of the opening in the head in which the working parts of the devices are located, and gives the head a finished appeau ance.

The rotatable sleeve and the clamping member are retained in the head 1 by a screw plug 21 having an opening therethrough for the passage of the shank of a tool.

The rotation of a tool which, in the standard form, has an indentation or liattened portion 22 at its end is effected in unison with part-s of the form hereinbefore described, by the juncture effected by the engagement of the projection 5 of the sleeve 2 with this tlattened portion when the tool is introduced. Iut, as various constructions may be used for properly causing such rotation, the invention is not limited in this regard. For instance, as shown in Figure 7, the connection between the parts may be made by forming the upper end of the member G, with an inwardly extending portion 23, of a shape to conform to the flattened portion 22 of the tool, in order that when the tool is properly seated the sleeve, clamping member and tool will be so connected as to rotate in unison.

From the foregoing description the operation of the securing means will readily be undei-stood. When it is desired to introduce, for use, a tool into the head, to be rotated by the described means, the cap 18 is depressed, causing the flaring end of the member 6 to protrude beyond the sleeve 2. In this position the end of the member expands, allowing the ready introduction of the shank of a tool. The tool is introduced in a position to cause the indentation 22 in the upper end of its shank to receive the projection 5 extending from the rotatable sleeve 2 and projecting into the member 6, insuring the positive rotation of the tool with the parts into which the shank is introduced. When the tool is thus positioned, pressure on the cap'is released and the spring acts to draw the flaring end of the member into the sleeve, in which position such end acts as a clamp to hold the tool against removal.

When the tool is released from the clamp by depressing the cap 18, the easy removal of the tool is insured, irrespective of the presence of rust on its shank due to contact with saliva' when in use or of the application to it of sterilizing fluid, for the reason that the yfreeing of the clamping end of the member 7 immediately results in its expanding and separating itself from the shank of the tool.

The securing means, which is simple and positive in its operations to hold and release a tool, presents means for securing a tool in place for use, which is free from the many objections to such means as heretofore constructed. Inasmuch as none of the means for holding the tool is subject to wear, the life of the device is practically unlimited.

I claim:

1. A dental handpiece, comprising a rotatable reciprocatory tool-receiving member, means for causing a tool to rotate with the member, the member being provided with means for clamping a tool, and a spring for member being provided with clamping means consisting vof a Vflaring compressible portion normally larger than the opening in the rotatable sleeve, a springinterposed between the sleeve and the tool-receiving member and acting to drawk the flaring ,portion into the sleeve, and means for `moving the member in a direction opposite to that induced by the spring.

4. A dental handpiece, comprising a rotatable sleeve, a reciprocatory` tool-receiving member extending through the sleeve and rotatable therewith, means for causing a tool to rotate with the member, the tool-receiving *e member being provided with clamping means consisting of a flaring compressible portion,

normally larger than the opening in the rotatable sleeve, and la spring for movingthe tool-receivingmember to operate the clamp- 111g means.

5. A dental handpiece, comprising a ro" tatable sleeve, a reciprocatory tool-receiving member extending through the sleeve and rotatable therewith, meansfor causing a tool to rotate with the member, the tool-receiving i member being provided with clamping means consisting ofy a flaring compressible portion, normally larger than the opening in the rotatable sleeve, a springiformoving -the toolreceivingmember to operate the clamping l' means, and a plate contacting with the mem ber, and adapted when pressed to move the .v member ina direction opposite to that-im-V parted by the spring, for releasing the olamp- Y ing means.

6. A dental handpiece,pcomprising a ro-v tatable sleeve, a reciprocatory tool-receiving member extending through the sleeve and rotatable therewith, means for causing a tool to rotate withthe member, the tool-receiving member beingprovided with means for engaging a tool having a circumferential groove, consisting'k of a flaring compressible portion, having inwardly extending projections, normally large-r than thev opening nin *i the rotatable sleeve, and a spring for moving the tool-receiving member to operate theengaging means. n

In testimony whereof YI aHX my signature.

Y PERRYR. SKINNER.