US911307A - Matrix-retainer. - Google Patents

Description

J. W. IVORY. V MATRIX RETAINER. AljPLIoATIoN FILED snPT.15, 190e.

@ln-venten lb a I Patented Feb. 2, 1909.

apertured at 2O for passage lof the screw. 16.

Avention in perspective. Fig. 2 represents JAMES W. IVORY, OF PHILADELPHIA, PENNSYLVANIA.

MATRIX-RETAINER.

Specification of Letters Patent.

Patented Feb. a, ieee.

Application :tiled September 15, 1908." Serial No. l153,102.

To all whom'it ,may'concerm v,

Be it known that I, JAMES W. IvonY, a subject of the King of Great Britain, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Matrix-Retainer, of which the following is va specification.

The purpose of my invention is to con?- form a matrix to the shape of a tooth.

For the purpose of illustrating my inven-v tion I havel shown in the accompanying drawing, one form thereof which is at resent preferred by me, siiicethe same has een found in practice to give satisfactory and reliable results, although it is to be under stood that the various instrumentalities of which my yinvention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instru; mentalities as herein'shown and described.

Figure 1 represents one form of my ina similar clamp to Fig.V 1 in side elevation, showing the matrix. Fio. 3 represents the same structure in longitudinal section. F 4 represents a similar structure in top plan view. Fig. 5 represents a modiiied form of my invention in side elevation. 'Similar numerals of reference indicate. corresponding parts in the figures. Referring to the drawings :4 1 designates a base bar which i-s bent laterally at one end at 2 and reversely bent atA 3 to provide a space 4, while at theother end it is provided with a lateral face' 5 preferably curved at 6 to conformto the usual shape of a tooth' and apertured at 7 and 8, these spaces being separated by a bar 9. The faces 10 and 11 as well as the bar 9 are rounded to reduce the friction of the band` or loop 12 thereon. The base bar islongitudinally slotted at 13 to provide a guide in which lthe screw 14 may travel, said screw passing through the slot into the nut 15 within which the screw 16 is ada ted topoperate. About the nut 15 I prefera ly form a easing 17 having a jaw 18 at the front end thereof and a back 19 This-caslng 17 ismost desirably rearwardly spring-pressed at 21 seas to bring its jaw 18 in contact with the end of the screwf'l and4 make it follow said screw. Ilhe jaw 18-'00- operates with a jaw 2,2, 'which may be either integral withfor separate from the lnut 15 but which is lpreferably carried rigidly thereby, to produce a vise or clamp for the ends 23 and 24 of the strap or loop 12.

It will be vevident that in the structure shown it is necessary for the clam i to be op pesite the apertures 7 and -8 and that the jaw 17 be withdrawn from the jaw 22, dif* fering in these particulars from the position shown in Fig. 3, in order that the ends 23 and 24 of the loop may be threaded there-V through.

' The screw 16 is intended for a double purpose, both to tighten the clamping jaw of the vise upon the lends 23 and 24 of the loop or band and'also to afford a means of longitudinal feed4 of this vise along the base bar 1. vThis latter function is accomplished by ine'ansof a nut 25 which is grooved at 26 and which is set within' an aperture 27 in the transverse bends 2and 3 of the base bar in such manner that the groove 26 shall in part coincide with the space between these transverse bends orplates. The sci/ew 27 passing through the bend 28 of the base plate fills up this aperture 26 at one point and prevents withdrawalof the nut longitudinally, the same being4 free to rotate and by its rotation to cause the longitudinal movement of the screw 16 with the vise and strap' in their set positions. Complete withdrawal of screw 16 from nut 15 is prevented by screw 29 fitted into groove 30, which forms a neck in said screw 16 or other suitable means, said groove freely receiving said screw 29.

`While I have chosen to illustrate the form of the vise and the arrangement of the nut `shown it will be evident that a great variety of these mi ht be made use of for obtaining part of t ie benefit of my invention andthat other forms or combinations than the bolt and operating nut might be made use of to secure common adjusting and tightening means. i. I

In the form shown in Fig. 5,1 make use of an lindependent clamping screw 31 to press the casing 3 2 against the ends 23 and 24, the casing being spring-retracted at 1 The support or guide 35 mayA bev made use of -in either of the forms. shown, in serving to hold the screw 30 and its attachments parallel and steady.

It will be evident `that the screw im- -pinges against the casing 32 to move it within the/loop to clamp or release'the ends '.23

and' 24 land that the spring 38 causes it toA les' vlongitudinally moving the head follow up thescrew upon the release 4thereof. It is evident also that there isy no necessity for use of a screw lin this form for .the purpose of tightening up the clamp, as its place is supplied by the screw 3l. The same function of the screw here provided of is present and the movement is providedby means of nut 25 and-limiting screw 28, as in the other forms.

yHaving thus described my invention, what I claim as my invention and desire to secure by Letters Patent, is:

jaws together.

'to said fixed jaw,

.1. In a matrix clamp, a base'bar, a slide movable longitudinally of said bar, a pair movable longitudia spring normally separating said jaws, slide and jaws longitudinally of said bar.

2. In a matrix clamp, a face adapted to engage with a tooth, a slide movable with respect thereto, a jaw iixed upon said slide,

Ia jaw longitudinally movable with respect means for normally supand means for forcing theporting said jaws,

3. In a matrix clamp, a base, a vise mov.- able longitudinally thereon, a bolt operating and means to move the I einser Qaid vise, a nut through which said bolt turns, and a support for said nut permitting rotation but preventing longitudinal movement thereof along the base bar.

4. In a matrix clamp, a vise, a base bar, a nut, and a screw passing through the nut to tighten thea vise and permit advance thereof along the base bar by movement of the nut.

5. In a matrix clamp, a base bar, a vise movable thereon, and common means for tightening the vise and longitudinally advancing it along the bar.

6. In a matrix clamp, a vise, a base bar, a screw engaging the vise to set the same,

means for advancing the screw andl vise longitudinally, and means for tion of said screw. f

f?. In a matrix clamp, a vise, a base bar, a screw engaging the vise to set the same, means for advancing the screw and vise longitudinally, and, means comprising a recess 1n the screw and pinl projecting therein for prreventing complete retraction of said screw om said vise.

` AJAMES W. IVORY. `Witnesses! W. S. JACKSON, JOHN A. y"Ninonneriann.

limiting retrac-

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