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Title: |
1895 Article-H. B. Brown Co., Merriman Bolt Cutter |
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Source: |
Modern Mechanism 1895 pg 71 |
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Insert Date: |
6/7/2011 8:51:26 AM |
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The Merriman Bolt-Cutter, or Threading Machine, is shown in Figs. 1 and 2. The vital portion of the machine is the head or chuck, which consists of four principal parts, as shown in Fig. 2. 1. The die-box, which is made of steel and contains the four die-slots, in which the dies are accurately fitted and firmly held. 2. The ring, which surrounds the die-box and receives the thrust or bearing of the dies when in operation. 3. The flange, which slides longitudinally upon the spindle, or shaft, in the rear of the ring, to which it is attached by two screws that pass through the two long slots into holes in the rear of the ring (not shown in the cut). 4. The cap, which is secured to the die-box by four screws that pass through the four holes in its face. In the rear of the die-slots are the four small levers, or " dogs," that serve to lift the dies from the bolt when the thread has been cut. As the flange and ring are fastened together by the slot-screws, when these parts are drawn back by means of the lever (see cut of the machine), the rear ends of the "dogs " are depressed, and the front ends, engaging under the projection or "nib" of the dies, lift the dies and release the bolt. When the ring is brought forward it strikes the inclines on the dies, which are then forced down in their slots and are again ready for service. Inside the ring are three sets, or series, of hardened steel eccentrics, on the outer one of which the dies have their thrust, or bearing, when in working position. By loosening the two slot-screws the ring may be rotated independently upon the die-box, a distance governed by the length of the die-slots, thus causing the eccentrics to operate upon the dies for their adjustment to such a degree as may be desired. By this means the dies may be made to cut the bolt to the size needful to make a tight or loose fit in the nut. The Merriman die is made of a plain piece of steel, milled or planed so as to leave a short " nib" or projection, under which the "dog" engages and lifts the die from its work. These dies can be recut several times for their original size of bolt; and after that capability has been exhausted, they can be recut for use on larger sizes of bolts that do not require so long dies. In operating the machine the thread is cut with four dies, which are fixed in the head upon a hollow shaft, and revolve around the bolt, which is held stationary in a vise operated by a right and left screw on the shaft of the small hand-wheel. The dies cut the thread by passing over the bolt but once. When the thread has been cut as far as desired, the dies are opened by moving the lever, and the bolt is withdrawn, while the machine still continues in motion. |
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1895 H. B. Brown Co., Merriman Bolt Cutter
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