US491316A

US491316A - Said dahl

Info

Publication number: US491316A
Authority: US
Publication date: 1893-02-07
Anticipated expiration: 1910-02-07

Description

(No Modei.)

J. E. LOW 3v M. DAHL.

TOOL HDLDBR. v

Patented Feb. 7, 1893.

UHF

Mmm

JU@ T linterna dTaTns FaTnNT @Trione JAMES E. IiOldT AND MAGNUS DAI-IL, OF OIIICAGO, ILLINOIS; SAID DAHL ASSIGNOR TO SAID LOV.

SEGIFICATXON forming part of Letters Patent No. 491,316, dated February 7, 1893. Application iiled September 22. 1890. Serial No. 365.794. (No modell) To onli whom it may concern:

Be it known that we, JAMES E. LOW and MAG-NUS DnHL, of Chicago, in the county of Cool; and State ot Illinois, have invented oertain new and useful Improvements in Toollrlolders or Clutches; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention has for its object to provide certain improvements in the construction of rotating tool holders such, for example, as are commonly used in connection with dental engines, though adapted for other uses.

A principal feature ci the improvement consists in the employment of a toggle as a inea-ns for giving a longitudinal movement to one of the parts ofthe clutch with respect to an other for the purpose of closing the clutch upon the shank ot the tool.

The invention consists, however, in other features ot construction also as will hereinafter fully appear from the description of the accompanying drawings.

In said drawings: Figure l is a longitudinal section of the complete tool holder taken in the plane in which the toggle works, the members of said toggle and its immediate connections being shown in side elevation. The toggle in this ligure is shown retracted, giving the gripping members ot the clutch their open position ready to receive the shank of the tool. Fig. 2 is a similar view of theparts immediately concerned with the toggle mechanism, showing the toggle extended and the clutch gripping the shank of a tool. Eig. 3 is a longitudinal section of the external and non-rotating parts of the tool holder as employed in connection with dental engines and an elevation of the interior and rotating parts, the section being taken in a plane at right angles to that ot the section shown in Figs. l and 2, or, in other words, at right angles to the plane in which the toggle works. Fig. d is a transverse section in the plane oli' the line e--e of Fig. l.

In the adaptationot' the invention to use in connection with dental engines illustrated in the foregoing iigures, the external and nonrotating parts which inclose the rotating inembers consist of a tip A, a cylindric sleeve A secured to the tip A, a cylinder A2 separated by a distance 'from the cylinder A', a tubeguard or sleeve A3 screwed to the cylinder A2, and a longitudinally sliding external sleeve A4 covering the space between the cylinders A and A2 and carrying the presser by which the interior toggle is extended. Vithin the shell composed of these members is a continuous, rotating tube B extending from the iuterior shoulder a at the outer end of the tip A to the outer end of the cylinder A2. Within said cylinder the tube bears against an annular shoulder a and thereby retains said cylinder outwardly in position.

B is a plug screwed into the inner end of the tube B and provided with an annular shoulder h which extends beyond the adjacent periphery of said tube and into bearing against the end of the shell cylinder A2. This plug thus retains the cylinder A2 inwardlyin place. At h the tube B is provided with a circumferential groove into which is iitted a ring d2, formed in seinieircular halves which are fastened to the shell cylinder A by screws o3 or otherwise, and this ring holds the parts A' and A in their proper relation to said tube For a short distance from the end of the tube B which occupies the tip A of the shell its interior is tapered or contracted, as clearly indicated in Figs. l and The tube B is provided with a longitudinal slot h2 between the proximate ends of the cylinders A and A2 of the shell, and through this slot projects inwardly the presser A5, movable in the slot by a lengthwise nuovement of the sleeve or shell A4 for the purpose of pressing inward and extending the toggle. Thus entering the slot b2, the presser must rotate with the tube B. To have, at the saine time, proper engagement with the sleeve A4 so as to be slid thereby, it is attached to a ring CL4 which is revoluble Within the slide and is held in place with respect thereto by the rings of a5 secured to and within the said slide. The mode of fastening the rings a5 to the sliding cylinder AA1 here shown is specially illustrated in section in Fig. fl wherein c di are pins thrust through both the slide and the rings. The ring a4 is shown fastened to TOO the presser A5 by a screw a7, accessible through a hole a8 in the slide.

C is a rod fitted to slide lengthwise in the tube B and extending from the slot b2 to or nearly to the mouth of the tip A. At its end adjacent to said mouth it is provided with, or constructed to form, a spring clutch which may close upon the shank of a tool T by outward movement within the tapered end portion of the tube B and may open or spread its jaws to release the tool upon the retraction of the rod. Such a spring clutch construction involves the familiar device of lengthwise slits in a tube, the jaws separated by the slits being forced toward each other to grip a tool shank as they are pushed into the contraction of a tube surrounding it and springing apart again to release the tool upon their retraction from such contracted portion of the tube. In the present instance the rod C :is not itself split at its end but is provided with a longitudinally drilled hole c which receives a second, split or slitted tube C fastened securely in the hole c and presenting a series of compressible jaws c c beyond the end of the rod C and within the tapered portion of the tube B. 3y making the jaws c of a tube separate from the rod C they may be hardened more conveniently and reliably and may be removed and replaced as occasion may require. No novelty is claimed for this feature.

At its opposite or inner end the rod C is attached to a toggle composed of the arms C2 C3 jointed to each other and one of them, C2, jointed to the extremity of the rod C. The other arm C3 is, at its outer end, jointed to a stationary part C4, here shown in the form of a disk secured by a screw c2 to a plug C5 which is screw-threaded into the open end of the tube B. This construction gi'ves adjustability of position to the stationary part C4, and by such adj ustability of said part the rod C may be slid forward in the tube B to a greater or less extent, as desired, ora delinite throw may be given thereto by a certain determinable movement of the toggle presser. The toggle C2 C3 is arranged with its arm C2 opposite the slot Z22 of the tube B and has its movement in the plane of said slot, and when the toggle is bent or retracted, as by a spring c3, said toggle will be deilected toward or into said slot b2, as shown in Fig. 1. The presser A5 is arranged to bear on the outersurface of said toggle arm C2so that by moving theslideAl which carries said presser in a direction away from the tip of the instrument said presser will slide upon said outer surface of the arm C2 and straighten the toggle, thereby causing the rod C to move outwardly within the tube B and the clutch to clamp the tool shank, as shown in Fig. 2. The movement of the slide and its presser is desirably such that the presser will be carried at its point of bearing on the toggle a little past the central joint of the latter, as indicated in Fig. 2, so that the tendency of the toggle to flex will contribute to the retention of vthe presser in its proper place when the toggle is extended. XVe prefer to give to the surface of the toggle arm upon which the presser bears the longitudinally and inwardly curved or concave contour illustrated in Figs. 1 and 2, so that the movement of the clutch rod C will be accomplished in a relatively short movement of the slide A4 and its presser A5. Ve also prefer to provide the presser A5 with an anti-friction roller a9 to render the movement of the slide more easy and to prevent wear. Manifestly an inward projection like A5 upon the sliding ring to which it is attached is only needful to the avoidance of too great protrusion. of the toggle, when retracted, through the slot of the tube B, and when the toggle is allowed to protrude sufficiently said projection may be omitted and the ring itself will become the presser.

rlhe rotation of the tube B is accomplished by the application of force to the plug B for which purpose said plug is shown provided with a shank b3 to which the power is applied through any suitable means. In the case of a dental engine suoli means will commonly be a rotating, iiexible shaft or other well known device for the purpose, but in other adaptations of the invention, as for example, to a watchmakers lathe, the shank b3 may be provided with a pulley to receive a driven belt or cord. The tube rotates the plug C'd which, through the screw c2, rotates the stationary member C1 of the toggle clutch mechanism and the parts connected therewith. If desired, the rod C,instead of being rotated through the toggle, may be splined or in any other familiar way made to revolve with the tube B While allowing longitudinal movement thereof.

In adapting the invention to other uses than that of a dental engine various modifications in formal features of construction will of course be made and they may obviously be made without departure from said invention.

In another application Serial blo/107,425, filed by us October 1, 1891, we have illustrated and described a toggle as being positively actuated in both directions, such construction being therein specifically claimed subject to the generic claim herein contained. WVe make no specific claim, therefore, to such mechanism in this application.

XVe claim as our invention:

l. In a clutch or tool holder having relatively stationary and longitudinally movable parts for the contraction and expansion of the clutch, the combination with the longitudinally movable member, of a toggle for imparting longitudinal motion thereto and means for actuating said toggle.

2. In combination with the relatively stationary and longitudinally movable members of a clutch device, a toggle arranged to give the longitudinal movement to one of said members, and a sliding sleeve or ring for extending the toggle.

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3. The combination with the tube B provided with e slot, ot e olutoh rod C, a. toggle applied to said rod, and s ring surrounding the tube B arranged to press on the toggle for the extension of tile latter.

4. The combination Twith n tube provided with it slot and interiorly tapered et its end, ot e rod fitted to said tube and carrying spring Gluten jews Within the tapered end ot' the tube, e toggle arranged opposite tbe slot and working in tile plone thereof, one of the arms ot' seid toggle being attached to the rod and the other to e stationery part, L sliding ring einbreeing tbe tube l5 and provided with a presser having bearing upon the toggle through the slot.

5. The combination with the slotted tube B, sliding rod G carrying olnteh jews, toggle arms C2 G3, the adj nstsble part C connected with the toggle, and e sliding ring for extend ing the toggle.

6. The combination of a non-rotating shell composed ot parts of which the parts A and A2 ere seperated by e speoe, and at surrounding sleeve covering seid space and adapted to slide on the adje-cent members of the shell, of :t rotating tube B provided with e slot opposite tile space in the shell and suitably shouldered to tite shell for the retention of the parts et the letter in their pieces on said tube, e rod C Carrying spring j eWs, a toggle attached to seid rod and to n stationery member, a, ring surrounding the tube B and provided with et presser bearing upon the toggle, and ineens 'for retaining seid ring in pince with respect to the surrounding sleeve while revoluble with respect thereto, substantially es described.

7. The combination of the shell composed of tbe members A A A2 A3 and sliding member A4 of the revoluble tube B properly shouldered with the seperated portions of the shell for their retention in place thereon, the rod C carrying the spring clutch jews of the clutch proper, tbe adj ustable part C", the toggle members C2 C3 connected with the parts C and O4, e spring arranged to flex seid toggle, n. ring a4 revoluble Within the sleeve Afl and provided with e presser bearing upon the toggle, and retaining shoulders on the interior ot' the slide A4.

In testimony that We claim the foregoing es our invention We affix our signatures in presenoe of two Witnesses.

JAMES E. LOV. MAGNUS DAHL.

`Witnessesz C. CLARENCE POOLE, GEORGE W. HIGGINS, Jr.