US633588A - Pneumatic stay-bolt clipper. - Google Patents

Description

No. 883,588. Patented' sept. 28, |899. A. HELwlG.

PNEUMATIC STAY BOLT GLIPPER.

(Application led Nov. 8, 1898.)

{No Model.)

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NTTED STATES PATENT OFFICE.

ANNA I-IELWIG, OF STL PAUL, MINNESOTA.

PNEUMATIC STAY-BOLT CLIPPER.

SPECIFICATION forming part of Letters Patent No. 633,588, dated September 26, 1899.

Application led November 8, 1898.

To @ZZ whom t may concern:

13e it known that I, ANNA HELWIG, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvementsin Bolt and Rivet Cutters; and I do declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the iigures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in bolt and rivet cutters; and the main object of my invention is to provide a light, compact, and handy bolt and rivet clipper which may be handled and used with ease and rapidity and which may be operated by the pressure of air, steam, or any other gas or fluid. This and other objects I attain by the novel construction and arrangement of parts illustrated in the accompanying drawings, in which- Figure 1 is a side view of the complete machine in question. Fig. 2 is a top view of Fig. 1, shown asin position for cutting off the surplus ends of stay-bolts in a piece of a steamboiler. Fig. 3 is an enlarged rear end view of the operating-cylinder. Fig. 4 is a longitudinal central section through the cylinder on a vertical line in Fig. 2 or a horizontal line in Fig. Fig. 5 is a front end view of the cylinder, or rather its front cover, showing how the working yoke is secured thereto. Fig. 6 is a side view of the piston and piston-rod and the interior of the front portion of the machine, one of the frame-plates being removed. In this figure, also, some modifications in the construction are shown. Fig. 7 is a detail view of an eye-stud for guiding a certain gage. Fig. 8 is a detail top view of the gage guided and retained by the stud in Fig. 7. Fig. D is a sectional top view on the line ci a. in Fig. G. Figs. 10 and 11 are sectional details of a portion of the rear part of the cylinder and the air, steam, gas, or other fluid admission and exhaust valve, illustrating the operation more fully.

Referring to the various parts in the drawings by reference-numerals, 1 1 are the cheekplates serving as the frame of the machine.

Serial No. 695,811.1.l (No model.)

These are secured together by the two bolts 2, upon which are pivotally mounted between the plates the jaw-levers 3, provided with cutting edges or knives Ll. Upon the bolts 5, which also help to secure the plates 1 1 together, are fulcrumed a pair of power-increasing levers 6 G, of which the front ends engage the rear ends 7 of the jaw-levers, while the long rear ends, which in Fig. 1 will be seen to curve outward toward their ends, form the operating.- levers. To or between the rear edges or lips S of the cheek-plates is secured the end of the piston-rod 9 of the piston 10, upon which moves back and forth the doubleacting cylinder 11, Which, upon the diametrical lug 12 of its front head 16 or otherwise secured to it, carries the yoke 13, which by its antifriction-rollers 14 closes and by its pins' 15 spreads the levers 6 as the cylinder moves backward or forward, respectively. From the. rear cylinder-head 17 to the outer ends of the yoke extend the rods 18, which brace the yoke, so that it may be made very light and also serve, together with the bolts 19, to keep the heads on theV cylinder, which may, however, also have the heads screwthreaded into or, as in Fig. 4, upon its ends.

This construction enables the cylinder to be in a shell 20, formed upon the head 17, and

secured in the shell by a screw-cap 21, and with four pipes 27, 26, 25, and 28, leading into the shell at equidistant points, as shown in Figs. 3 and 11. The pipe 27 leads to the forward end of the cylinder through the head 12,while the opposite pipe 2G leads to the other end of the cylinder through the head 17 ,while the pipes 25 andf2S lead olf at right angles to the pipes 27 and 26, the pipe 25 being the airintake pipe and the pipe 2S being the exhaustpipe from the cylinder. The plug 22 is formed with two elongated cavities 23 24 on opposite sides, as shown in Fig. 10, adapted to alternately connect the pipes 27 and 25 or pipes 2S and 26, or vice versa, as the case may bethat is to say, if the plug 22 be turned as IOO shown in Fig. ll the compressed air will tlow through the passage and pipe 27 into the forward end or" the cylinder, and the air on the opposite side of the cylinder will exhaust through the pipe 26, passage 24, and pipe 28. Then if the plug 22 be turned one-fourth a revolution the air entering by the pipe 25 will flow through the passage 23 and pipe 26 to the rear end of the cylinder and exhaust through the pipe 27, passage 24, and pipe 28 from the front end of the cylinder.

The valve 22 is adapted to be operated by pins or arms 29, attached to the rearwardlyextended valve-stem 3l, and the throw is limited by a stop-pin 32. IVhen the pins 29 are thrown as shown in Fig. 3, the passages 23 and 24 will be in the reversed position from that shown in Fig. ll, and if the pins 29 be reversed in position then it will be readily understood the valve will be reversed.

The valve-stem 3l serves the double purpose of a means for rotating the valve and also as a handle by which to guide the machine.

33 is a clevis by which the machine may bel suspended from a counterbalanced rope to assist in raising` and lowering it about steamboilers and other iron structures on which it is to operate. This clevis maybe secured in any suitable way and to any suitable point of the machine; but in the present instance it is shown as pivoted on the bolt 34, by which the piston-rod is secured to the plates and which is extended so that its outer end forms a handle 35 and its inner end forms a gage 36, adapted to touch against the plate of the structure worked upon, as shown at 37, and thus cause the edges of the cutters to come to their transverse position upon the bolts to be cut just as soon as they are thrown up to the plate of the structure. The quick guiding of the cutting edges to the proper point and position upon the bolt to be cut is further facilitated by the sliding gage or guide 38, which is guided between the adjacent roundings 39 of the jaw-levers and the plates l l and has its rear and round portion encircled by a coil-spring 40 and retained in the eye-stud 4l by the pin 42. The spring 40, butting against the eye-stud, holds the slide normally forward with the pin 42 against the stud 4l and the front end 43 against the side of the bolt 44 to be cut, and which is thereby held about centrally to the knives, as shown in Figs. l and 6.

The piston-rod may have shoulders, like 45, butting against the rear end of the cheekplates l, to help the pin 36 take the pushing pressure on the piston-rod, or the additional pin 46 may be inserted, as shown in the moditication Fig. 6, where the piston-rod is thus made rigid with the plates l and serves thereby as a guide for the cylinder directly and for the operating-levers indirectly through the yoke 13. In the modification shown in Fig.

6 the intermeshing cogs 47 are dispensed with and dependence placed on the coaction of the the gage 38, only that they are regulated and retained not by a pin, but by nuts placed, like 5l, upon the stem 52, which projects through the back side of the lever.

In operation the gages 48 touch against the face of the boiler-plate or other structure operated upon, and thus hold theknives the proper distance from the plate, and the gage or guide 38 guides the knives into their central position relatively to the bolt, and the guide 36 insures the transverse position of the knives across the bolt, so that the machine can in an instant be placed in correct position on the bolt. Usually, after the machine is suspended by a rope or chain, the operator, with one hand on the handhold 35 and with the other hand on the handle formed by the valve-stem 3l, places the machine on the bolt and turns the stem 3l, so that the compressed air or other similar agent enters the rear end of the cylinder and forcing it and the yoke rearwardly operates the levers and cuts the bolt fast or slowly, according as the stop-levers 29 are regulated relatively to the stop, giving the air a larger or smaller inlet to the cylinder. The valve-plug is then turned in the reverse direction, so that the air exhausts from the rear and enters the front end of the cylinder, which moves the latter forward, thereby spreading the levers 6 and the knives 4 into readiness for operation on the next bolt. The yielding spring 40 allows the guide 38 to slide backward when pressed upon by the spreading of the bolt as the knives cut through it. In like manner the springs 49 on the gages 48 yield, so as to prevent the knives from breaking when they are slightly drawn toward the work or plate by their greater bevel or grinding on the outer than the inner side.

53 are holes in the levers 6 for the reception of the stops 54 to arrest the rearward motion of the yoke when the edges of the knives are sutliciently close together to sever anything between them. As the knives get worn and shortened by grinding the stops are moved rearward.

It is obvious that the form and location of the valve and its connection with the cylinder, as well as the shape of the yoke and braces on it, may be much varied without diverging from the spirit of this invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. A bolt or rivet cutter comprising two plates for its frame having pivoted between said plates a pair of jaw-levers and a pair of power-increasing operating-levers engaging the jaw-levers; a piston-rod having one end secured to said plat-es and its other end pro- IOS IIO

vided with a piston, a cylinder sliding upon said piston and piston-rod and carrying a yoke which engages the operating-levers so as to spread and close them, and a valve arrangement for conducting compressed air or similar agent into and from either end of the cylinder, substantially as shown and described.

2. A bolt or rivet clipper comprising two plates for its frame having pivoted between said plates a pair of jaw-levers and a pair of power-increasing operating-levers engaging the jaw-levers; a piston-rod having one end secured to said plates and its other end provided with a piston, a cylinder sliding upon said piston and piston-rod and carrying ayoke which engages the operating-levers so as to spread and close them, and a valve arrangement for conducting compressed air or similar agent into and from either end of the cylinder, said yoke carrying antifriction-rollers to lessen the friction of its contact with the levers.

3. A bolt or rivet cutter comprising two plates for its frame having pivoted between said plates a pair of jaw-levers and a pair of power-increasing operating-levers engaging the jaw-levers; a piston-rod having one end secured to said plates and its other end provided with a piston, a cylinder sliding upon said piston and piston-rod and carrying a yoke which engages the operating-levers, so as to spread and close them, and a valve arrangement for conducting compressed air or similar agent into and from either end of the cylinder, said yoke carrying antifriction-rollers to lessen the friction of its contact with the levers, and said operating-levers being curved outward toward their free end, substantially as shown and described.

et. A bolt or rivet cutter comprising two plates for its frame having pivoted between said plates a pair ot' jaw-levers and a pair of power-increasing operating-levers engaging the jaw-levers; a piston-rod having one end secured to said plates and its other end provided with a piston, a cylinder sliding upon said piston and piston -rod and carrying a yoke which engages the operating-levers so as to spread and close them, and a valve arrangement for conducting compressed air or similar agent into and from either end of the cylinder, said operating-levers having adjustable stops to limit the motion of the yoke, substantially as shown and described.

5. A bolt or rivet cutter comprising two plates for its frame having pivoted between said plates a pair of jaw-levers and a pair of power-increasing operating-levers engaging the jaw-levers; a piston-rod having one end secured to said plates and its other end provided with a piston, a cylinder sliding upon said piston and piston-rod and carrying a yoke which engages the operating-levers so as to spread and close them, and a valve arrangement for conducting compressed air or l similar agent into and from either end of the cylinder, said yoke being secured at one end i of the cylinder or its head and having braces from near its outer ends to the head at the other end of the cylinder, substantially as shown and described.

6. In a bolt and rivet clipper the combination with a pair of cutting-jaws having their cutting edges standing at a bevel with the side of the machine, of a guide projecting from the side of the machine and adapted to touch the plate of the structure operated upon when the cutters are near the plat-e and stand parallel toits face, substantially as and for the purpose set forth.

'7. A boltor rivet clipper having a guide touching one side of the bolt to be cut when the knives of the cutter are in central position to the bolt, substantially as set forth.

8. In ay bolt or rivet cutter of the class described, the combination of yielding gages 48, and 38, adapted to guide the cutting edges of the machine both in longitudinal and transverse direction upon the bolt to be cut, substantially as shown and described.

9. In a bolt or rivet cutter of the class described, the combination of yielding gages 48 and 3S, adapted to guide the cutting edges of the machine, both in longitudinal and transverse direction upon the bolt to be cut, and a rigid guide adapted to touch the work and hold the cutting edges across the bolt, substantially as shown and described.

lO. A bolt and rivet clipper of the class described, the same having a yielding guide or gage touching the side of the bolt or rivet to be ont when the knives are about central to the bolt, so as to prevent cutting at the corners or ends of the cutting edges, substantially as set forth.

ll. A bolt or rivet cutter having a longitudinally-moving cylinder adjacent to its operating-levers and a yoke or arms extending from the cylinder and operating the levers, a piston in the cylinder and a piston-rod extending therefrom and secured with its outer end to the framework of the machine, and means for admitting steam or compressed air or fluid to the cylinder, substantially as and for the purpose set forth.

l2. In a bolt or rivet cutter of the class described, the combination with the cylinder ll, having the yoke 13, operating the levers of the machine, of the centrally-arranged rotary valve 20, at the end of the cylinder, communicatingwith both ends thereof, and having an inlet and exhaust pipe, the stem 3l, extending from the plug of the valve, the two levers 29, adj ustably secured on the stem and the stop 32 limiting the motion of the said levers, substantially as and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

ANNA HELVVIG.

XVitnesses:

MoN. SEYMOUR, A. M. GARLSEN.

IOO

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