US831354A - Pivot-joint. - Google Patents

Description

PATENTED SEPT. 18, 1906.

C. D. KING.

PIVOT JOINT. APPLICATION FILED DEO. 4. 1905.

CHARLES D. KING, OF BROOKLYN, NEW YORK.

PIVOT-JOINT.

Specification of Letters Patent.

unir 'am ra. en sep.18,19oe.

Application tiled December 4, 1905. Serial No. 290.104.

To all, whom, it may concern.-

Be it known that I, CHARLES D. KING, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Pivot-Joints, of which the following is a specification.

This invention relates to pivot-joints 5 and its object is to provide joints of this class which can be more readily adjusted than those heretofore made, which will be less liable to breakage, and which will need a minimum of repairing.

The invention is applicable to a number of articles, but is shown applied to mathematical instruments, such as Compasses or dividers; but I do not limit myself to this application of the invention. Pivot-joints as commonly made for such instruments consist of a forked handle containing` a pair of screwpivots impinging in depressions in the upper ends of the compass-legs, and the pivots are kept from turning by small set-'screws bearing on the threads of the pivot-screws or by lock-nuts. It is obvious that the set-screws will often ruin the `threads of the pivots, and also they are often broken off and ruin the instruments. The lock-nuts when used are unsatisfactory and imperfect in their action, frequently working loose, and requiring adjustment at inconvenient times.

My invention differs from others of the class named from the fact that the pivots and their adjusting means are made as separate members, and by that separation it is possible to positively lock the pivots against rotative movement relative to their supports when the instrument is opened and closed, and thus to make it impossible to turn the adjusting-screws the smallest fraction of a turn by such action. This makes the adjustment very lasting and obviates the need of locking the adjusting screws or screw, (where only one is used,) so that readjustment is made by a slight turning. of these screws.

Referring to the drawings, Figure l is an enlarged side elevation, partly in section, on the center line of a compass or divider embodying my invention. Fig. 2 is a front elevation of the same. Figs. 3 and 4 are respectively side elevation and transverse section of the pivots drawn to a still larger scale. elevation and longitudinal section of the adjusting-screws.

Figs. 5 and 6 are respectively front.

The instrument here illustrated has the usual divider-legs a a', formed with diskshaped upper ends b b and a forked supporting member c, having a handle c and proj ections c2 c3 to support the pivots d and adjusting-screws c and -Referring to Figs.' 3 and 4, the pivots are seen to be formed with conical pivoting-surfaces d, which bear in conical depressions a2, formed in the ends of the divider-legs. They also have square-ended lugs or elongations d2, adapted to lock against the upper inside face c4 of the pivot-supporting member c, and they have holes d, which fit the pin or elongation of the screw e..

The adjusting-screws e and f are short headless screws of ne pitch, having the usual slots for turning them. The screw c has an elongation @Q smaller in diameter than the threaded portion, which fits the holes d3 in the pivots and also passes freely through holes a3 in the divider-legs a a and enters the hole f in the screwf when the various parts are assembled. The hole f extends nearly through the screw f, so that a small clearance is left between the end of the pin c and the end of the hole when both are in place in the instrument, thus allowing for such adjustment as becomes necessary through wear on the pivots.

To assemble the various parts of the instrument, the legs (L a are placed together, while the pivots d d are placed in the depressions az, the fork c is slipped over them, and the screws e and f are placed in their respective holes in the fork c, the pin c serving to bring the pivots in line with each other and with the other screwf, after which the screws are given their final adjustment to bring the pivots against the divider-legs with sufficient pressure to secure easy and accurate worki ng of the instrument. j Adjustment is made afterward as the pivoting-surfaces wear off by turning one or other of the screws a very slight amount, and they remain positively in j such adjustment, as there is nothing to give unintentional turning of the adj usting-screws. For turning the screws a screw-driver is preferred; but they may also be adapted for wrenches of suitable construction.

If desired, the adjusting-screwf may be omitted from the instrument, and in such a modification it would be necessary to have the pin e i'it an unthreaded hole in the proj ection c3 to bring the pivots into proper alinement.

IOO

IIC

Various other modifications, may be devised within the scope of my invention, and I do not limit myself to one particular form.

I claim as my inventionl. A pivot-joint for relatively movable members, comprising a suitable support, pivoting means within said support having integral locking means, juncture portions on the relatively movable members also disposed within said support and pivotcd by said pivoting means, means for holding the pivoting means and the said juncture portions to the support, and means for adjusting said pivoting means and said juncture portions in position.

2. A pivot-joint 'for relatively movable members, comprising a suitable support, a pivot having integral means for locking it against rotative movement, juncture portions of relatively movable members connectable therewith, and means for holding said juncture portions and pivot to the support and adjusting them in proper position.

3. A pivot-joint Jfor relatively movable members, comprising a vforked support, pivotal portions of relatively movable members projecting into the fork thereof, self-locking` pivots on opposite sides of' said pivotal portions witliin said fork, and means Jfor holding and adjusting said pivotal portions and said pivots `in their respective positions in the support.

4. A pivot compass joint comprising a yoke, self-locking pivots carried therein, pivotal portions of compass-legs pivoted by said pivots, and means for alining and holding the pivots and pivotal portions of the legs to the yoke and usting them in position.

5. A pivot compass-joint comprising a forked support, pivots carried therein having lugs locking with said support to prevent rotation of the pivots, pivotal portions of compass-legs pivoted by said pivots, screws for adjusting said pivots, and a central member for alining the pivots and the pivotal portions of the legs with the support.

Signed at New York, in the county of New York and State of New York, this 24th day of November, A. D. 1905.

CHARLES D. KING.

l/Vitnesses:

ADoLPi-r F. DrNsE, EDGAR A. FnLLows.

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