US1197648A - Dental instrument. - Google Patents

Description

' l, H. MEYERS.

DENTAL INSTRUMENT.

APPLICATION HLED MAY 15. 1916.

Patented Sept. 12, 1916.

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@Nozwmyi xlli lV-Wmow l UNITED STATES PATENT JOHN HENRY MEYERS, OF GRAND ISLAND, NEBRASKA.

DENTAL INSTRUMENT.

Applioation filedMay 15, 1915.

To all whom z'tmay concern Be it known that I, JOH -HENRY Mar- ERs, a citizen of the United States, residing at Grand Island, in the county of Hall and State of Nebraska, have invented certain new and useful Improvements in Dental Instruments; andI do declare the following to bea full, clear, and exactdescript on of :the invention, such as will enable others skilled in the art to which it appertains .to make and use the same.

This invention relates .to' improvements in dental instruments and more particularly and arrangement of parts as will be hereinafter more particularly described and claimed.

In the accompanying drawings Figure 1 is a side elevation of an instrument constructed in accordance with this invention with the jaws in closed position; Fig. 2 is a longitudinal section thereof; Fig. 3 is a similar view taken in a plane atrightangles to Fig. 2 .on the line 33 of Fig. 2, and with-the jaws in open position; Fig.4 is

transversesection taken on the line el.4c. of

Fig. 3 Fig. 5 .is a similar view taken on.the line 5:5 of -Fi g..3;:and Fig. 6 is a detail perspective view ofone of the jaws.

In the embodiment illustrated, a handle '1 is shown having a socket Q with oppositely disposed grooves 3 therein to receive L teral retaining projections A: on a head 5,:said projections being here shown v in the form of rectangular screw heads whichare designed for securing longitudinallyextending plate springs 6 and 7 to sald head. These square heads when inserted in the grooves 3 serve to hold the head against turning relatively-t0 the handle. Thishead Specification of Letters Patent.

Patented Sept. 12,1916.

Serial 1]: 9. 97 644.

5 is shown provided with oppositely disposed openings 8 in its side walls in which said springsti and 7 are mounted, oneend being secured to the head adjacent the inner end of the opening and the .otherend extendingi forwardly into the head, said forwardly projecting end of each spring being shown reduced and the springcurved longitudinally outward :to adapt the free s he of t ear 0r b y a a ns h inner endsof toolengaging jaws .10, and 11 presently to be described.

Two parallel longitudinally extending laterally spaced arms .12 and 18 project from the frontend of the head and have anopening between them which. communicates with the interior of the .headand through .which .extends the free endsof the springsfiand 7 Pivoted between the arms and 131at .the front ends thereof are the two jaws 10 and 11 which are exactly alike in formation,

the opposed faces .of which are rectilinear throughout the greater portion of their length and are dQSlg ne d when the jaws are in closed position .tocontact. Thepivotsfi) whic on ect the j a the arms .1

and 13, extend-through said jawsat points spaced inwardly from their .rear ends,;said

read ends being of a length slightly less thanthe distancebetween the pivots 9 and the head 5 from which the arms extend so .35 to provide ample space to permit the jaws to swing laterally between saidarrns.

One of these jaws isshown in detail in Fig. .-6 andthe inner face or edge thereof is cut away from a point slightly in advance of thc'fulcrurn reoeivingopening 9 thereinto the rear terminal of the jaw. A shoulder 14 is .for nedat the front end of said cutaway portion, the front corner of which is beveled for a purpose to bedescribed. The

cut-away portion of the jaw is also'inclined inwardly toward its free rear end and against which face the outwardlybent terminal,o f oneo-f the springs is designed to engageso that whenthe jaws are assembled and 'pivotally mQunted between the arms .12 and 13 of the head 5, the inner faces of their rear terminals will be spaced some distance apart to provide for their movement toward each other on the separation of the front ends of the jaws by means to be described.

The free front ends of the jaws l0 and 11 are shown serrated or toothed on their outer faces to provide gripping means for engaging and securely holding the crown or other article with which the jaws are adapted to be engaged, it being understood that the closed ends of the aws are inserted in the crown and then forced open for holding it securely in engagement with said crown.

The means for opening the jaws is shown in the form of a rod 15 having a milled operating head 16 at one end and a wedgeshaped member 17 at its other end. This wedge-shaped member is here shown in the form of a cone and is designed to extend between the jaws 10 and 11 for forcing the free ends thereof into open position. This rod 15 is of a length sufiicient to extend through the handle 1 and through the hollow head 5 and to project between the rear ends of the jaws pivoted in the arms 12 and 13 of said head. A portion of this rod 15 is threaded for engagement with a threaded extension 5 formed on the rear end of the head 5 and when the parts are in assembled operative position, as shown in Fig. 3, the

cone-shaped wedge member 17 will be disposed between the opposed faces of the rear ends of the jaws 10 and 11 with the point of said member extending between the inclined or beveled corners of the shoulder 14; so that when said rod is moved forwardly, its end will be forced between the jaws in advance of their pivots and thereby force the front ends of said jaws open against the tension of the springs 6 and 7 which are engaged with their rear ends as will be clearly seen from Fig. 3. When it is desired to disengage the tool from a crown, the rod is moved rearwardly by turning the same in the opposite direction, thereby disengaging the wedge-like end 17 thereof from the jaws which will immediately close under the action of the springs 6 and 7.

A ferrule 18 is shown arranged around the head in advance of thehandle 1 to assist in connecting these parts and to protect the head against the entrance of dust or grit therein.

From the above description, it will be obvious that a neat and compact tool is formed, the parts of which may be readily assembled or disassembled for repairing or other purposes and that to engage or disengage the tool from the object which it is designed to hold, all that is necessary is to turn the milled head 16 in one direction or the other for opening or closing the jaws.

By forming the beveled opposed corners or faces of the jaws in advance of their fulcrums or pivotal points and employing in connection therewith the cone-shaped opening member 17, these jaws may be gradually opened to bring their biting ends into engagement with a crown so that while it will be reliably held, all danger of injuring it or changing its configuration, will be avoided.

I claim as my invention:

1. A. device of the class described com prising a pair of pivotally mounted jaws, resilient means engaging said jaws on one side of their pivot for moving them into closed position, and a jaw opening member operable between them on the side of the pivot opposite to the side with which the closing means is engaged, whereby the jaws are forced apart against the tension of their closing means.

2. A device of the classdescribed comprising a head, a pair of jaws pivotally mounted therein intermediate of their ends, resilient means for holding said jaws in closed position, and a wedge-shaped member movable longitudinally between the jaws from the rear end thereof for engagement with their opposed faces in advance of their pivotal connection for opening the jaws against the tension of their resilient closing means.

3. A device of the class described comprising a head, a pair of jaws pivotally mounted therein intermediate of their ends, resilient means for holding said jaws in closed position, and a wedge-shaped member movable longitudinally between the jaws from the rear end thereof for engagement with their opposed faces in advance of their pivotal connection for opening the jaws against the tension of their resilient closing means, the

opposed faces of said jaws in adyance of their pivotal connection converging forwardly to receive said wedge-shaped opening member and by means of which the jaws may be gradually opened on the forward movement of said member.

1. A device of the class described comprising a hollow head having forwardly extending laterally spaced parallel arms at its front end and an internally threaded extension at its rear end, jaws pivotally mounted intermediately of their ends between said arms, springs carried by said head and mounted between the rear ends of said arms for forcing them apart and their front ends into closed position, and a rod having threaded engagement with the extension at the rear end of said head and provided with a wedge-like member for insertion between said jaws in advance of their pivotal connection whereby their front ends are forcibly separated against the tension of their springs.

5. In a device of the class described, a handle having a bore extending longitudinally therethrough and enlarged at its front end to form a socket, said socket having opopening member movable longitudinally in positely disposed grooves in its side walls, said handle and head, and actuating means a hollow head havlng a tubular extension at for said member. its rear end for insertion in said socket, piv- In testimony whereof I have hereunto set 5 oted jaws carried by said head, springs normy hand in presence of two subscribing Wit- 15 mally closing said jaws, attaching screws for nesses.

said springs having angular heads for en- JOHN HENRY MEYERS. gagement with the grooves of said handle Witnesses: socket whereby said head is held against BENJAMIN J. CUNNINGHAM,

l0 turning relatively to said handle, a jaw MABELL F. WINANS.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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