US2718732A

US2718732A - Snagging grinder

Info

Publication number: US2718732A
Application number: US285423A
Authority: US
Inventors: George E Comstock
Original assignee: Norton Co
Current assignee: Saint Gobain Abrasives Inc
Priority date: 1952-05-01
Filing date: 1952-05-01
Publication date: 1955-09-27
Anticipated expiration: 1972-09-27

Description

Sept 27,1955 G. E; CoMsTocK, 3RD 2,718,732

SNAGGING GRINDER Filed May l, 1952 2 Sheets-Sheet 2 INVENToR. G50/615 E.- COMSToc/frd United States Patent() SNAGGING GRINDER George E. Comstock 3rd, Holden, Mass., assignor to Norton Company, Worcester, Mass., a corporation of Massachusetts Application May 1, 1952, Serial No. 285,423

4 Claims. (Cl. 51-47) The invention relates to snagging grinders.

One object of the invention is to provide a snagging grinder which can be operated with little effort. Another object is to provide a thoroughly safe snagging grinder. Another object is to provide a snagging grinder of rugged yet simple construction and which is versatile so that it can snag small or large billets, short or elongated castings and can therefore be used for a variety of purposes in a steel plant or foundry.

Another object of the invention is to provide a snagging grinder capable of operating with higher pressures between the grinding wheel and the work piece than have hitherto been achieved in actual practice. Another object is to provide an economical grinder from the standpoint of grinding cost per unit volume of work.

Other objects will be in part obvious or in part pointed out hereinafter.

In the accompanying drawings illustrating one of many possible embodiments of the invention,

Figure 1 is a side elevation of the snagging grinder.

Figure 2 is a view partly in plan and partly in section of a so-called swing frame which is a component of the grinder,

Figure 3 is a front elevation of the grinder,

Figure 4 is a vertical sectional view of one of the control valves.

Referring now to Figures 1 and 3, a pair'of overhead I-beams and 11 each supports two sets of

trolleys

12 and 13 in the case of the I-beams 10 and 15 in the case of the I-beam 11 which collectively support a horizontal frame 16 just below the I-

beams

10 and 11. Articulated to this horizontal frame 16 on an upper horizontal rock shaft 17 is a depending frame 18 supporting at the lower end a lower horizontal rock shaft 19 secured to which are a pair of parallel plates 20 to the bottomof which are bolted two pairs of half clamps 21 and 22 (see now also Figure 2) each pair of which is also bolted together at the bottom securely to clamp a sleeve 23 to the plates 20. Rotatably mounted in the sleeve 23 is the main frame rod 24 of a swing frame grinder which includes a motor 25 and a wheel guard and mounting 26.

Referring now to Figure l rigidly secured to the horizontal frame 16 and depending from it is an arm 27. At the lower end of the arm 27 is a pivot pin 28 supporting the left hand end of a cylinder 29 having therein a piston, not shown, whose piston rod 31 is connected by a clevis 32 to a pin 33 extending between arms 34' rigidly secured to the frame 1S. Activation of the cylinder 29 serves to move the wheel guard 26 forwardly or rearwardly.

Referring now to Figures 2 and 3, an arm 36 has a hub portion 37 which is pinned by means of a pin 38 to the main frame rod 24. Connected by a pivot pin 39 to the arm 36 is a piston rod 40 connected to a piston, not shown, located in a cylinder 42 the upper end of which is articulated to a plate 44 which, like the parallel plates 20, is secured to the lower horizontal rockshaft 19. Thus the cylinder 42 can` be activated to tilt the main vframe rod 24 in either direction at the will of the operator 2,718,732 Patented Sept. 27, 1955 by simple controlling mechanism to be hereinafter described. The hub 37 holds the main frame rod 24 from movement forward relative to the sleeve 23 and a collar 45 pinned to the frame rod 24 by means of pin 46 holds the latter from moving rearwardly relative to the sleeve 23.

Referring now to Figures 1 and 2, the wheel guard mounting 26 is rigidly secured to a bracket 50 having a hub portion 51 surrounding the forward end of the main frame rod 24 and pinned to it by means of a pin 52. A ring 53 is welded to the upper portion of the wheel guard 26 and a chain 54 is connected thereto. The other end of the chain 54 is connected by a shackle 55 to a piston rod 56 having a piston, not shown, in a cylinder 57, the other end of which is articulated to the horizontal frame 16 by means of a pin 58 and angle irons 59. Activation of the cylinder 57 serves therefore to raise or lower the wheel guard and mounting 26.

Referring to Figure 1, pivotally connected to the rear end of the frame rod 24 by means of a pin 61 is a large plate 62 to which is bolted the motor 25 which has a double pulley 64 which by means of a pair of belts 65 drives, as better shown in Figure 2, a pair of pulleys 66 clamped to a grinding wheel 67, the pulleys 66 and the grinding wheel 67 being rotatably mounted on a shaft 68 which is supported by the massive sides of the wheel guard and mounting 26 and is held from removal therefrom by means of a wedge pin 69. Referring to Figures l and 2, a pin 70 extends through the main frame rod 24 and pivotally mounted thereon is a block 71 through which extends a screw shaft 72 which can be turned by a handle 73. The end of the screw shaft 72 is turned to a small diameter fitting the hole through the block 71 and the resultant shoulder takes the thrust of the shaft 72 against the block 71 when the screw shaft 72 is turned to tighten the belts 65. The screw shaft 72 is held in the block 71 by means of a washer and cotter pin 74. The screw shaft 72 passes through a swivelnut 76 which is connected to the plate 62. It will now be seen that by turning of the screw shaft 72 the plate 62- can be tipped relative to the main frame rod 24 to any desired angle, within limits, to tighten or loosen the belts 65 as desired.

For moving the horizontal frame 16 suspended from its trolleys which are movable on the I-

beams

10 and 11, I provide a cylinder 78 having a piston, not shown, connected by a piston rod 79 to a pivot pin 80 in a bracket 81 secured to the under side of the I-beam 10, as shown in Figure 3. The other end of the cylinder 78 is articulated to the frame 16 by means of a pin 82 extending through a bracket 83 whichV is welded to the framey 16. Activation of the cylinder 78 therefore serves to move the frame 16 along the I-

beams

10 and 11.

Referring now to Figure 3, the cylinder 78 is controlled by a hand lever 91, the cylinder 29 (Figure l) is controlled by a hand lever 92, the cylinder 57 is controlled by ice a hand lever 93 and the cylinder 42 is controlled by a hand lever 94. Each of these levers controls a valve, the valves are all alike and a cross section of one is shown in Figure 4. Each valve lever has a short portion 95 extending at right angles to the upstanding part of the valve lever, and the outer end of the short portion 95 is connected by a link 96 to a ange 97 projecting from a cap 98 of a valve casing 99. A valve piston 100 with three lands is movable in a bore in each casing 99 which the lands snugly t. Each valve casing 99 has a pressure channel and a pair of exhaust channels 106. Four valve casings 99 are aligned and bolted together with bolts 110. Each valve casing 99 has a pair of channels 111 and 112 for sending oil to and receiving oil from the cylinder which the particular valve controls.

Referring now to Figure 1, I provide a tank 11S which contains a supply of oil which is the hydraulic uid to ac-tuate the cylinders. On the cover of the tank 115 is a motor 116 whose motor shaft 117 is coupled to the pump shaft 118 of a pump 119.

The output side of the pump 119 is connected to piping 12) which is connected to all of the pressure channels 105 by being connected to one thereof since they are cross connected to each other by a cross channel 121 which extends through each valve casing 99 and between them, suitable gaskets being provided to prevent leakage at the junctions and the outer ends of the cross channel being blocked by covers 122, Figure 3. Piping 123 connects a cross channel 124 to the tank 115 and the cross channel 124 likewise extends through each valve casing 99 and between them connecting all of the exhaust channels 106 together, and the same gaskets and .the covers 122 prevent leakage. Thus whenever a hand lever such as the hand lever 91 is moved to the right, Figure 4, the channel 111 is connected to exhaust and the channel 112 is connected to pressure. Connected to the piping 120 is a pressure gauge 125 which can be connected to register the pressure or shut oi by means of a hand valve 126. The suction side of the pump 119 is connected by piping 127 to the tank 115 and of course the piping 127 terminates at a low point in the tank 115 so that the system will still operate with only a low level of oil in the tank. One of the covers 122 has a relief valve, not shown, built therein which, on any increase of pressure to overload, will shunt the iluid from the cross channel 121 to the cross channel 124.

In Figure 3 the valve casings 99 are identified as 99a, 99b, 99C and 99d, the valve pistons 160 thereof being respectively operated by the

respective hand levers

91, 92, 93 and 94. The channel 111 of the casing 99a 'is connected to piping 131, the channel 112 of the casing 99a is connected to piping 132, the `channel 111 of the casing 99b is connected to piping 133 and the channel 112 of the casing 99h is connected to piping 134. The channel 111 of the casing 99C is connected to piping 135, the channel 112 of the casing 99e is connected to piping 136, the channel 111 of the casing 99d is connected to piping 137 and the channel 112 of the casing 99d is connected to piping 138.

The piping 131 is connected by a iiexible hose 131C: to the piston rod end of the cylinder 78, and the piping 132 is connected by a flexible hose 132a to the other end of the cylinder 78. The operator is assumed to stand in front of the

handles

91, 92, 93 and 94. Consequently when the operator draws the handle l91 towards him fluid under pressure is directed through the channel 111,

into the piping 131 and through the hose 1.31ct to the left hand side of the cylinder 78 thus moving the horizontal frame 16 to the left, Figure 3. Conversely pushing the handle 91 away from him results in moving the horizontal frame 16 tothe right.

The piping 133 is connected to `a flexible hose 133a which is connected to piping 133b secured to the frame 16 which is connected to a flexible hose 133e which is connected to the left hand end (Figure l) of the cylinder 29. The piping 134 is connected by a flexible hose 134a to piping 134k secured to the frame 16 which is connected by a flexible hose 134C to the right hand end (Figure l) of the cylinder 29. Consequently when the operator draws the hand lever 92 towards him, fluid under pressure is directed through the channel 111 through the piping 133a and the other connections mentioned to the left hand end of the cylinder 29 which results in moving the depend-ing frame 18 rearwardly of the whole machine, that is to the right in Figure l, and pushing the handle 92 'away from him results in the opposite action.

The piping 135 is connected to a iiexible hose 135:1 which is .connected to piping 135 secured to the frame 16 which is connected by a flexible hose 135C to the upper end of the cylinder 57. The piping 136 is connected by a exible hose 136e: to piping 136b secured to the frame 16 which is connected to a flexible hose 136C which is connected to the lower end of the cylinder 57. Consequently when the operator draws the hand lever 93 towards him uid under pressure is directed through channel 111 and piping 135 and the connections mentioned to the upper end of the cylinder 57 which moves the piston rod 56 downwardly and rst lowers the grinding wheel 67 and ultimately allows it to press against the billet or other work piece being ground with a force due to one or more weights 151 removably placed on handle bars 152 projecting forward from the wheel guard 26. Conversely when the operator pushes the hand lever 93 from him, fluid is admitted to the lower end of cylinder 57 which raises the piston rod 56 and causes the chain 54 to lift the wheel guard 26 and the grinding wheel 67 from the billet 150.

The piping 137 is connected 4to a exible hose 137a which is connected to piping 137b secured to the frame 16 which is connected to a exible hose 137e which is connected -to piping 137d secured to the depending frame 18 which is connected to a llexible hose 137e which is connected to the upper end of the cylinder 42. The piping 138 -is connected by a exible hose 138a to piping 13`8b secured to the frame 16 which is connected to a exible hose 138C which is connected to piping 138d secured to the frame 18 which is connected to a flexible hose 138e which is connected to the lower end of the cylinder 42. Consequently when the operator draws the hand lever 94 towards him iluid under pressure is directed to the channel 111 and through piping 137 and the connections mentioned to the upper end of the cylinder 42 and this action causes clockwise displacement of the rod 24 as viewed from the front of the machine; conversely movement of the hand lever 94 away from the operator causes counter-clockwise displacement of the rod 24.

Thus the hand lever 91 controls the movement of the frame 16 along the overhead I-

beams

10 and 11; the hand lever 92 controls movement of the grinding wheel toward the front and toward the rear of the machine; the hand lever 93 controls elevation and lowering of the grinding wheel, and the hand lever 94 controls the tilt of the grinding wheel.

The work piece 150 which may be a billet or otherwise is shown as held between

vise parts

153 and 154 attached to a massive table or support 155 but with this matter -my invention has really nothing to do.

The valve pistons 100 are normally maintained in neutral position by means of a device well known for such purposes consisting of a pair of washers and 161 with an interposed spring 162, the assembly being held on a reduced end portion of the piston 100 by a nut 163 and the washer 160 therefore contacting a shoulder of the piston 100. The washer 160 cannot rise above the position shown in Figure 4 on account of a shoulder in the casing 99 while the washer 161 cannot descend below the position shown in Figure 4 by reason of a shoulder in a cap 165.

Billets have previously been ground mostly by hand operated swing frame grinders. Such a grinder consists of the main frame rod 24, the motor 25, the wheel guard 26, the double pulley 64, the pair of belts 65, the pair of pulleys 66 together with associated parts, the entire unit being upheld by a chain attached to the frame rod 24 about at the center of gravity of the assembly before weights 151 are added. By means of handle bars like the handle bars 152 the operator moves the swing frame grinder over the work piece pulling it forward and pushing it back to cause the grinding wheel 67 to contact whatever portion of the work piece he desires, he places as many weights 151 and of such mass `as he desires to produce the grinding pressure and he swings the entire frame to obtain the traverse between grinding wheel and work piece lengthwise of the billet 150 while he must lift the whole assembly from time to time and is further required to tilt it by lifting up one handle bar and pressing down the other in 0rder to cause the corner of the wheel to dig deep into the work piece. All this is very hard work. In accordance with the present invention all of the relative motions between grinding wheel and work piece can be achieved but none of them require any exertion on the part of the operator. Operating the hand levers 91, 92, 93 and 94 is something like running anrautomobile; a little practice soon produces versatility and a great deal of experience will get the operator so familiar with the controls that he can watch the work piece and not the levers and his hands will respond to his desire to send the grinding wheel wherever it is needed. Thus the snagging grinder of this invention can be used quickly to snag billets or clean castings and at the least possible effort on the part of the operator. Furthermore a great number of weights 151 can be put onto the handle bars 152 totaling a mass of many hundreds of pounds without in any way fatiguing the operator. Billet cleaning can be done much more quickly if the pressure between wheel and work piece can be made very high.

It will thus be seen that there has been provided by this invention a snagging grinder in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

I claim:

1. A Vsnagging grinder comprising an overhead frame, guiding means guiding said overhead frame for horizontal movement, a depending frame articulated to said overhead frame on a first horizontal axis, a connection articulated to said depending frame on a second horizontal axis well below said rst horizontal axis, an elongated frame piece supported by said connection and extending in a direction perpendicular to a plane passing through said second horizontal axis, a grinding wheel shaft mounted on said elongated frame piece remote from said connection said shaft having an axis perpendicular to said direction, power means connecting said overhead frame to said depending frame adapted to move said depending frame relative to said overhead frame in either direction and to hold said depending frame at any position to which it is moved, power means for moving said overhead frame along said guiding means, power means for raising said grinding wheel shaft, means articulating said elongated frame piece to said connection on an axis coinciding with said direction, and power means for angularly moving said elongated frame piece on its axis of articulation.

2. A snagging grinder comprising an overhead frame, guiding means guiding said overhead frame for horizontal movement, a depending frame articulated to said overhead frame on a first horizontal axis, a connection articulated to said depending frame on a second horizontal axis well below said rst horizontal axis, an elongated frame piece supported by said connection and extending in a direction perpendicular to a plane passing through said second horizontal axis, a grinding wheel shaft mounted on said elongated frame piece remote from said connection said shaft having an axis perpendicular to said direction, power means connecting said overhead frame to said depending frame adapted to move said depending frame relative to said overhead frame in either direction and to hold said depending frame at any position to which it is moved, power means for raising said grinding wheel shaft, means articulating said elongated frame piece to said connection on an axis coinciding with said direction, and power means for angularly moving said elongated frame piece on its axis of articulation.

3. A snagging grinder comprising an overhead frame, guiding means guiding said overhead frame for horizontal movement, a depending frame articulated to said overhead frame on a rst horizontal axis, a connection articulated to said depending frame on a second horizontal axis well below said first horizontal axis, an elongated frame piece supported by said connection and extending in a direction perpendicular to a plane passing through said second horizontal axis, a grinding wheel shaft mounted on said elongated frame piece remote from said connection said shaft having an axis perpendicular to said direction, power means connecting said overhead frame to said depending frame adapted to move said depending frame relative to said overhead frame in either direction and to hold said depending frame at any position to which it is moved, means articulating said elongated frame piece to said connection on an axis coinciding with said direction, and power means for angularly moving said elongated frame piece on its axis of articulation.

4. A snagging grinder comprising an overhead frame, guiding means guiding said overhead frame for horizontal movement, a depending frame articulated to said overhead frame on a first horizontal axis, a connection articulated to said depending frame on a second horizontal axis well below said first horizontal axis, an elongated frame piece supported by said connection and extending in a direction perpendicular to a plane passing through said second horizontal axis, a grinding wheel shaft mounted on said elongated frame piece remote from said connection said shaft having an axis perpendicular to said direction, power means connecting said overhead frame to said depending frame adapted to move said depending frame relative to said overhead frame in either direction and to hold said depending frame at any position to which it is moved, power means for moving said overhead frame along said guiding means, means articulating said elongated frame piece to said connection on an axis coinciding with said direction, and power means for angularly moving said elongated frame piece on its axis of articulation.

References Cited inthe file of this patent UNITED STATES PATENTS 1,166,640 Shaw Jan. 4, 1916 1,958,534 Dunbar May 15, 1934 2,308,842 Wilson Jan. 19, 1943 2,308,843 Wilson Jan. 19, 1943 2,403,341 Carlson July 2, 1946 2,442,042 Hamilton May 25, 1948 2,569,291 Davis Sept. 25, 1951