US1792120A - Instrument holder - Google Patents

Description

O. H. PIEPER Feb. l0, 1931.

INSTRUMENT HOLDER Original Filed April 2, 1926 4 Y fr .f

Patented Fel. 10, 17931 'UNITED STATES gPA.'rliNT OFFICE om PIEPEB, 0l' ROCHESTER, NEW YORK 'INSTRUMENT HOLDER Application illedApril ,2, 1926, Serial lo. 99,286. ARenewed December 16, 1929.

tachedfto the instrument handles by ordi-` nary screw threads, and in some cases by a bayonet joint. The objections to these arrangements arer that too much time is consumed 1n turning the bases of the tools or instruments into or out`of the handle or grip ofthe holder. Another disadvantage and objection is that the instrument or tool will always have the same position relative to the electric controlling switch button, and this is not always most desirable orfconvenient in the manipulation of the holder.

The object'of'the invention is therefore to overcome all these objections by providing improved holding arrangement or joint between the instrument or tool and the grip or handle part which will permit the instrument or tool to be quickly inserted or removed and which will also permit the instrument or tool to be easily turned to the desired position relative 'to the switch button while the instrument is being used. This is accomplished by means of a split collet in the mouth of the handle, and a tapered shank or plug on the base of the instrument or tool. The structure will be more fully understood by reference to the drawings, on which,

Figure 1 is a side elevational view of a dental holder and tool;

Fig. 2 is an enlarged sectional view on plane 2--2 of Figure 1;

Fig. 3 is an enlarged side elevational view of the split collet;

Fig. 4 is an inner end view of the collet;

Fig. 5 is a side elevational view of the instrument base; and

Fig. 6 is a sectional view on plane 6 6, Figure 2.

In the structure shown the tubular handle or grip part 10 has the sleeve 1l which supports the contact button 12 which is readily slidable in the sleeve and through the slot 13 in the handle, and the longitudinal sliding motion of the tubular handle is limited by the extent of the slot 13. Within the tubular handle is circuit controlling mechanism comprising the supporting body 14' ofy insulating material and the terminal springs 15 and 16 'mounted thereon, the support being held within the tube by a screw 17 and the terminal springs connecting with'the circuit `cord 18 which extends through the plug 19"'at the end of the tubular handle.

In the from end 0f the banda, tube is in-` ible segments 22 by the slits 23.

y into the collet C. Theinner end of the shank which engages in the skirt section of the collet is preferablycylindrical and inI order-that the spring sections of the skirt may clamp the shank end the end may be of slightly larger diameter than the skirt or the skirt can be radially contracted after being slitted. The outer end of the shank is preferably tapered slightly and the outer end of the collet is tapered to correspond. The object of this is to'save making an extremely accurate t between the twoparts which would be necessary if both parts were straight. Ordinarily, the slit skirt end of the collet will exert eflicient clamping action on the shank to lock the instrument or tool against displacementduring use. The tapered surfacesV ofthe base and colletwill serve to lock the tube more rigidly and securely to the collet when desired. The instrument base may be readily vturned to seat in the collet or to be removed therefrom, or to be adjusted relative to the collet, the base being preferably knurled as indicated at 26 to aiord a better hold.

The instrument end or point 27 is inserted in the front end of the base24 and is hollow for receiving the electric heat element 28.

This element extends through an insulating bushing 29 in the base and one terminal of the element connects With the terminal tip 30 extending from the bushing 29. The other end of the heating element connects to the termi. nal sleeve 31 surrounding the terminal tip 30 and secured in the end of the base 24. lVhen the tool structureisl inserted into the handle or grip part, the terminal sleeve 31 Will en-v gage With the terminal spring 16 of the switch mechanisms within the handle, and upon depression of the button 12 the terminal spring 15 Will be brought into electrical contact with the terminal tip 8() so that the electric supply circuit Will be closed through the electric heat element and this element will then supply the necessary heat for the tool point. When thel instrument structure is inserted into the handle or grip part, the split collet Willlhold the base of the instrument tight enough Vso that "J the instrument Will not come out nor turn as a result of any pressure applied to it in the:

usual dental practice, and lby means of the knurling on the instrument basel the instru- 25 ment can bereadily turned into any position 'l desired relative to the switchrbutton 12 on the handle. No time is Wasted in applying a tool or instrument as a mere push or pullyvill serve to apply it to the handle or to remove vit 30, therefrom.

I claim as follows 1. An instrument structure of the class described comprisingv a handle part and an instrument part, said instrument part com-v prising a base having an operating tool eX- tending from the outer end thereof anda shank extendingy from the inner end thereof, and a collet threaded into the end of said handle part to form a socket forreceiving Y said shank, the inner end of said collet be ing entirely clear of the handle part wall and being split to form elastic segments for clamping said shank to thereby hold said instrument part in operativeposition. relative to the handle part.

2. In an instrument structure of the class described, the combination of a tubular body part and an instrument part, said instrument part comprising a base having an operating` tool extending from the outer end thereof and having a shank at its inner end, a collect' threaded 4into the end of said tubular han'- dle part to form a receiving socket for said shank, the inner end of said collet being entirely spaced away from the handle part Wall and being split to be radially elastic,said elastic sectionof the collet receiving the outer end of said shank to hold the instrument part in operative position relative to said handle part, the outer end of said collet being tapered and the inner endk of said shank being correspondingly tapered, said tapered sections interiitting; l

3.V In an instrument structure of the class described, the combination of a tubular handle part and an instrument part comprising a base having an operating tool at its outer end and a shank at its inner end, an electric heating element extending through said tool and base and terminals therefor at the inner end of said shank, a collet inserted in the end of said handle part andbeing spaced atits n` ner end entirely .avvayfrom the handle part Wall and being slitted longitudinally to provide clamping tongues, said shank fitting into said colletto be icla'mped by said tongues, circuit terminals Within said handle part,

land a push button controlling-the operative connection of said circuit terminals With said heating element terminals, the clamping enthe combination of a tubular handle part, aV

socket member forming part ofV and secured in the open end of'saidy handle part andv hav- ,I

ing a taperedbore, asplit skirt extending from said socket member forming .a continuation of said ytapered `bore and being clear of the handle part Wall t0v be radiallyyieldable,

and an instrument part comprising a base having a shank extending therefrom, said shank atits endbeingv cylindrical to engage in said split skirt and above said end being tapered to fit the tapered bore of said socket.

In Witness whereof, Ivhereunto subscribe f day of March, 1926.

my name this 29th OSCAR H. PIEPER.

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