USRE1475E - Diamond-protector - Google Patents

Description

UNITED STATES PATENT OFFICE.

JOI-IN DIOKINSON, OF BROOKLYN, NEV YORK.

DIAMOND- PROTECTOR.

Specification forming part of Leiters Patent No. 33,187, dated September 3, 1861 5 Reissue No. 1,475, dated May 19, 1863.

To all whom it may concern.:

Be it known that I, Jol-IN Dickinson, of Brooklyn, Kings county, State of N ew York, have invented certain new and useful Improvements in Diamond-Protectors forDressing Millstones; and I do hereby declare the following to be a full description ot the same.

The nature of my invention consists, first, in the method of constructing the stem in which the diamond is set, and combining it with a stockl or diamond stem-holder for the purpose of protecting the setting of the diamond when being drawn across the face of the niillstone 5 second, in the method of mak` ing the pressure of the diamond ontheface of the millstone self-adjustable by means of a tension-sprin g acting upon the diamond-stem, in combination with the protector-stock 5 third, in the method of gaging and controlling the depth of the cut ofthe diamond in the face of the stone by means of a gage, in combination with aprotector-stock for the purpose of supporting it upon the edge or edges (as the case may be) of a single or double guideway rule; fourth, in the combination of a diamond-holder protector-stock having a gage attached thereto for regulating the set of the diamond with reference to the depth of the cut in the face of the stone to bemade, with a double-Way guide-rule as a means of supporting and giving steadiness of motion to the diamond when being drawn across the face of the millstone and at the same time enabling the operator to make the parallel cuts in the face of the stone more perfectly and evenly than eould'be doneif the diamondstock was not supported at opposite sides in the guideway.

But to describe my invention more particularly I will refer to the accompaning drawings, forming a part of this specification, the same letters of reference Wherever' they occur referring to like parts.

Figure 1 is a plan view of the protector, in combination with a double guideway parallel rule. Fig. 2 is a right-hand side view of the protector. Fig. 3 is a left-hand side view of the protector. Fig. 4 is a transverse-cut section of the double guideway parallel rule, showing an end elevation ot the protector through the line x2 x2, Fig. 1. Fig. 5 is avertical-cut section of the protector through the linear fr, Fig. l..

Letter A is a diamond stem-holder or protector-stock, having a square or othershaped openin g vertically through it. In this opening is arranged a metal stem, B, having in its lower end a diamond. To prevent the diamond from projecting too far below the face oi' the protector-stock, so as to be liable to fall into any cavities in the face of the stone and thus endanger the setting, if not destroy it as wellas the diamond, a ledge, G, is formed on the stem B, which, resting upon a corresponding ledge, I), in the sides of the opening through which it operates, prevents the diamond from coming in contact with any object below a given and Xed point, and thus protects it against the numerous accidents it- Would be subjected Ato in drawing rapidly across the face of a millstoneif not thus limted in coming in contact with the stone.

For the purpose of giving to the diamond an elastic and at the same time constant pressure, I attach, by means of ascrew,E, a spring, F, to the top of the stock A, so as to cause the opposite end of the spring to rest upon the head of an adjustable set-screw, G, in the head of the stem B. By this means, and according to the set of the adjustable screw G, a greater orlless tension can be gi'ven to the spring to force the point oi' the diamond into the face of the stone to give it the requisite grinding-surface. It will be obvious that this precise mode of applying the spring to give to the diamond a self-adjustable pressure upon the stone may be varied, by giving t0 the spring a spiralform,and adjusting it upon the stem B, so as to produce the like effect obtained by the use of the spring F, herein described; but as such variation is onlyin mode of application, and not in principle or eiect produced, I deem themone and the same invention, and so intend to use one or both modes of applying a spring to the stem B as circumstances may suggest.

Letters H are gages attached to the sides of the protector-stock by set-screws I. These gages are made adjustable, and their object is to control the set of the protector in the guide-rule J, and at the same time support it in a firm and steady manner on the rule when being drawn across its length to cut the stone.

Where a single straight-edge rule is used, the two gages H and H on the opposite sides of the protector are not absolutely necessary for the working of the instrument, as the inner gage H may answer to support the instrument on a single straight-edge rule; but I do not deem a single straight-edge rule suf. iicient to give the required steadiness of motion to the diamond to draw lines parallel to each other on a scale of some twenty to thirty lines to the inch-the range usually adopted by millers in dressing millstones with the diamond. I therefore prefer the double guide- Way rule and the two adjustable gages attached to the protector or diamond-holder as being the only safe way of making perfect parallel lines for the dressing of the face of .the millstone.

Having now described my invention, I will proceed to set forth what I claim and desire to secure Letters Patent- 1. The stem B, having a ledge or stop c in equi valent device, for supporting the diam ondholder on a single or double straightedge rule, With the diamond-holder, substantially as hereinbefore set forth.

4. The combination of a double straightedge guidevrule,with the gages H and dia-p mond-protector stock, substantially as hereinbefore described, and for the purposes set forth.

JOHN DIGKINSON.

lVlitnesses: v

B. W. EroHoLTZ, CHARLES L. BARRITT.

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