US2704912A - Snagging grinder - Google Patents

Description

March 29, 1955 c. SODERLUND SNAGGING GRINDER 3 Sheets-Sheet 1 Filed Aug. 13, 1952 INVENTOR. EARL Sums/ L/JNI] M bimon- ATTORNEY Filed Aug. 13, 1952 C. SODERLUND SNAGGING GRINDER 3 Sheets-Sheet 3 "a I [04 7 I 54 728 /-L/ 28 65@ f 65!) INVENTOR.

ATTURN EY United States Patent SNAGGING GRINDER Carl Soderlund, Worcester, Mass., assignor to Norton Company, Worcester, Mass., a corporation of Massachusetts Application August 13, 1952, Serial No. 304,170

Claims. (Cl. 51-35) The invention relates to grinding machines, and more particularly to a snagging grinder for surfaces, billets and the like.

One object of the invention is to provide a simple and thoroughly practical snagging grinder. Another object is to provide a snagging grinder which is arranged so that it may be operated and controlled with a minimum amount of manual exertion. Another object is to provide a mounting for a swing frame grinder which may be transversed longitudinally and transversely and may be raised and tilted in a vertical plane as desired. Another object is to provide an adjustably mounted weight mechanism for supplying the desired operating pressure of the grinding wheel upon the work piece being ground. A further object is to provide a readily controllable transversing mechanism whereby the weight may be readily adjusted and positioned from the operating control station. Other objects will be in part obvious or in part pointed out hereinafter.

In the accompanying drawings in which is shown one of various possible embodiments of the mechanical features of this invention:

Figure 1 is a side elevation of the snagging grinding machine;

Figure 2 is a fragmentary plane view, on an enlarged scale, of the control handles;

Figure 3 is a front elevation of the machine;

Figure 4 is a fragmentary detailed view of the gearing in the chain hoist unit;

Figure 5 is a fragmentary vertical sectional view, on an enlarged scale, taken approximately on the line 5-5 of Figure l;

Figure 6 is a side elevation, on an enlarged scale, of the fluid actuated tractor unit; and

Figure 7 is a right hand end elevation of the unit as I shown in Figure 6.

A snagging grinder has been illustrated in the drawings comprising a longitudinally transversable frame 10 which is formed of a Welded channel beam construction comprising a rectangularly shaped base portion 11 having a pair of spaced trapezoidally- shaped frames 12 and 13 which support a transversely extending I-beam 14 which serves as a slideway for a transversely movable slide 15 which will be hereinafter described.

The frame 10 is provided with a pair of spaced rotatable shafts 16 and 17 which are journalled in suitable bearings thereon. The shafts 16 and 17 are provided with two pairs of spaced wheels 18, 18a and 19, respectively (only three of which are shown). The wheels 18 and 19 are arranged to roll upon a pair of spaced rails or guideways 21 and 22 to facilitate a longitudinal transversing movement of the frame 10. The rails or guideways 21 and 22 are fixedly mounted on a base 20.

A power operative transverse mechanism is provided on the frame 10 comprising a motor driven gear reduction unit 23 which is mounted on the base portion 11 of the frame 10. The unit 23 is provided with a driven shaft 24 having sprocket 25 which is connected by a link chain 26 with a sprocket 27 fixedly mounted on the shaft 16. The motor driven gear reduction unit is preferably driven by a reversible electric motor 28 which is con trolled by a push button reversing switch 30. The reversing switch 30 comprises a pair of push buttons 31 and 32 for controlling the direction of rotation of the motor 28 so as to control the direction of longitudinal traversing movement of the frame 10. A rheostat 33,

2,704,912 Patented Mar. 29, 1955 mounted on the frame 12, is provided to facilitate controlling the speed of the motor unit 23 thereby to control the traversing speed of the frame 10 in either direction.

The transversely movable slide 15 is preferably formed with a U-shaped cross section. The slide 15 is provided with a pair of spaced rollers 35 and 36 adjacent to the forward end of the slide 15 and a pair of rollers 37 and 38 located adjacent to the rearward end thereof. The rollers 3536 and 3738 are arranged to roll upon the opposite channel faces 39 of the I-beam 14 to facilitate a transverse movement of the slide 15.

A suitable power operated mechanism is provided for traversing the slide 15 transversely relative to the frame 10 in either direction as desired. This mechanism may comprise a motor driven fluid operated tractor unit 40, such as for example that known as the Calabar fluid tractor, which is manufactured by the Calabar Corporation of Southgate, California. The unit 40 comprises a frame having two pairs of spaced wheels 41, 42 and 42a (only three of which have been illustrated) which are rotatably supported on the frame of the unit 40. The rollers 41, 4242a ride Within the opposed channelled surfaces of the I-beam 14 and serve as a roller support for the unit 40. The unit 40 comprises an electric motor 43 which is connected by a rotary fluid coupling 44 with a shaft 45. The shaft 45 is provided with a sprocket 46 which is connected by a link chain 47 with a sprocket 48. The sprocket 48 is mounted on the right hand end of a rotatable shaft 49. A worm 50 is formed integral the shaft 49 and meshes with a worm gear 51 mounted on a rotatable shaft 52. The shaft 52 supports a driven wheel 53 having a peripheral surface in frictional driving engagement with the lower plane surface 54 of the I-beam 14. The electric motor 43 is preferably a reversible motor which may be readily controlled by a push button reversing switch 55. The reversing switch 55 comprises a pair of push buttons 56 and 57.

The tractor unit 40 is connected to the slide 15 by means of a link 60 (Fig. 1). The link 60 is pivotally connected by a stud 61 to the tractor unit 40. The other end of the link 60 is connected by a stud 62 with the slide 15. It will be readily apparent from the foregoing disclosure that actuation of the push button 56 serves to start the motor 43 to cause a forward movement of the tractor unit 40 and the slide 15, that is, in a direction toward the left (Fig. 1). Similarly actuation of the push button 57 causes a reverse rotation of the motor 43 to cause a rearward movement of the tractor unit 40 and the slide 15.

The slide 15 supports a carrier 65 which is made up of a pair of channel irons 65a and 65b welded together (Flg. 5) to form a boxlike structure, fl1e ends of which are enclosed by a pair of end plates or caps 65c and 65d (Fig. l). The carrier 65 is supported by a manually operable chain hoist 66 having a manually operable actuating chain 67. The hoist is provided with a hook 68 which is fastened to an eye 69 depending from the slide 15. The lower end of the hoist 66 is provided with a hook 70 which engages an eye 71 fastened to the upper surface of the carrier 65 so as to form a pivotal flexible connection between the slide 15 and the carrier 65. The forward end of the carrier 65 is supported by a power actuated electric hoist 72, such as for example a Yale Midget King electric hoist manufactured by the Yale and Towne Manufacturing Company of Philadelphia, Pennsylvania. The hoist 72 is provided with a hook 73 which engages an eye 74 depending from the forward end of the slide 15. The lower end of the hoist is provided with a book 75 which engages an eye 76 fixedly supported on the forward end of the carrier 65. The hoist 72 is provided with a manually operable control handle 77 which is arranged to actuate a rock shaft 78 which in turn actuates a start and stop switch (not shown) and a motor brake to be hereinafter described. The hoist 72 contains an electric motor 79 (Figs. 1 and 3) having a motor shaft 80 (Fig. 4) which is provided with a gear 81. The gear 81 meshes With a gear 82 carried by a rotatable shaft 83. The shaft 83 is provided with a gear 84 which meshes with a gear 85 mounted on a rotatable shaft 86. The shaft 86 is provided with a driving sprocket 87 for actuating a roller type link chain 88 the lower end of which supports the hook 75.

In order to control the rapid stopping and starting of the hoist, a suitable motor brake is provided comprising a brake drum 89 fixedly mounted on the motor shaft 80. A pair of pivotally mounted brake shoes 90 and 91 are arranged diagrammatically on opposite sides of the drum 89. The brake shoes 90 and 91 are pivotally supported on studs 92 and 93 respectively. A pair of spaced compression springs 94 and 95 carried by a rod 96 serve normally to maintain the brake shoes in braking engagement with the drum 89. The inner end of the rock shaft 78 is provided with a portion of rectangular cross section 97 which is positioned between the heads of a pair of adjusting screws 98 and 99 carried by the brake shoes 90 and 91. It will be readily apparent from the foregoing disclosure that when the control handle 77 is rocked in either direction to start operation of the hoist 72, the rocking movement of the rock shaft 78 rocks the portions 97 so as to spread adjusting screws 98 and 99 and thereby to rock the brake shoes 90 and 91 respectively out of engagement with the brake drum 89 to start the actuation of the hoist 72. Similarly when the handle 77 is rocked to stop the actuation of the hoist 72, the returning of the portion 97 of the rock shaft 78 into the portion illustrated in Figure 4 serves to release the compression of the springs 94 and 95 thereby moving the brake shoes 90 and 91 respectively into braking engagement with the drum 89 rapidly to stop the motion of the hoist 72.

It is desirable to connect the carrier 65 with the slide so that it will move longitudinally with the slide 15. This is preferably accomplished by providing downwardly extending angle iron brackets 100 and 101 which are fixedly mounted on opposite sides of the slide 15. The lower ends of the brackets 100 and 101 are provided with cylindrically shaped bosses 102 and 103 respectively which set within parallel flanged surfaces 104 and 105 which are fixedly mounted on the carrier 65. It will be readily apparent from the foregoing disclosure that the bosses 102 and 103 between flanged surfaces 104 and 105 forms a trunnioned support for the carrier so that the carrier 65 is free to move vertically or to be tilted in a vertical plane relative to the slide 15 and is arranged to move transversely with the slide 15.

A swing frame grinder 110 is provided with a forwarding bracket 111 which is supported by a hook 112 depending from the carrier 65. The bracket 111 is clamped onto a rotatable sleeve carried by the swing frame grinder 110. An electric motor 114 is supported on the right wheel spindle 117 mounted at the left hand end of the v (Fig. 1.) It is preferable to swing frame grinder 110. provide an additional support for the swing frame so that it may be moved transversely by movement of the slide 15 or longitudinally by movement of the frame 10. The left hand end of the swing frame grinder 110 is connected by a stud 118 with a bracket 119, depending from the left hand end of the carrier 65. If it is desired to actuate the swing frame grinder 110 manually, the stud 118 may be removed and the swing frame may be manually actuated by the handle bars 120. In this condition the swing frame grinder 110 may be swung in any direction, that is, in a vertical plane or a horizontal plane or the swing frame may be rocked about its longitudinal axis as desired.

In order to obtain one of the main objects of the invention, it is desirable to provide an adjustable mechanism whereby the grinding pressure of the grinding wheel 116 on the work piece may be varied if desired. As illustrated in the drawings a rectangularly shaped weight 125 is provided within a central aperture 126 formed within the carrier 65. The weight 125 is provided with two pair of spaced rollers 127 and 128 which roll upon a guide surface 129 formed within the channel irons 65a and 65b of the carrier 65.

It is desirable to provide a suitable mechanism for readily adjusting the position of the weight longitudinally relative to the carrier 65 so that the grinding pressure may be readily varied as desired. In the preferred construction, a rotatable feed screw 130 is rotatably supported at its right hand end by the end cap 65d of the carrier 65. The feed screw 130 is screw threaded into the weight 125. A motor driven gear reducer unit 131 is mounted on the upper surface at the right hand end of the carrier 65. The unit 131 is provided with a driven shaft 132 having a sprocket 133 which is connected by means of a link chain 134 with a sprocket 135 mounted on the right hand end of the feed screw 130 (Fig. 1). The motor driven reducer unit is preferably driven by a reversible motor so that the direction of the rotation of the said screw may be readily changed as desired. A push button control switch 136 is mounted on the forward end of the carrier 65 within easy reach from the control station. By manipulation of the switch 136, the weight 125 may be readily transversed longitudinally within the carrier 65 to obtain the desired grinding pressure.

A work piece 140, such as, a billet or other similar object to be ground is mounted on a work supporting platen 141. By imparting a longitudinal or a transverse movement to the grinding wheel 116, the upper surface of the billet may be readily ground as required.

The operation of the improved snagging grinder will be readily apparent from the foregoing disclosure. A work piece, such as the billet 140 is mounted on the work supporting platen 141. The hoists 66 and 72 are then actuated to position the carrier 65 in a substantially horizontal position with the grinding wheel 116 in engagement with the upper surface of the work to be ground. In this position of the parts, the hoist 72 is actuated by the control handle 77 to slack-off on the forward end of the carrier 65 so that the combined weight of the forward portion of the carrier 65 and the adjustable weight 125 serves to provide the desired grinding pressure between the grinding wheel 116 and the work piece 140. In this position of the parts, the frame 10 may be transversed longitudinally in either direction by actuation of the push buttons 31 and 32. Actuation of the push button 31 causes the frame 10 to move toward the right (Fig. 3) and actuation of the push button 32 serves to cause the frame 10 to move in a direction toward the left. Actuation of the push buttons 56 and 57 produces a transverse movement of the slide 15 together with the carrier 65 and the grinding wheel 116. Actuation of the push button 56 causes a forward movement of the slide 15, that is, toward the left (Fig. 1). Actuation of the push button 57 causes a rearward movement of the slide 15, that is, toward the right (Fig. 1). It will be readily apparent from the foregoing disclosure that by manipulation of the push buttons 31-32 and 5657, the grinding wheel 116 may be traversed longitudinally in either direction and moved transversely in either direction so that the entire upper face of the billet may be ground. If more or less grinding pressure is desired, the push button switch 136 may be actuated to shift the weight 125 longitudinally relative to the carrier 65. If it is desired to grind a small area on the work piece, such as, removing a pit or a seam in a small portion thereon, the wheel 116 may be given a short longitudinal traverse movement by actuation of the push buttons above described or the stud 118 may be removed and by manipulation of the handle bars 120 the swing frame grinder 110 may be actuated manually to produce the desired grinding action.

It will thus be seen that there has been provided by this invention a grinding machine in which the various objects hereinabove set forth have many thoroughly practical advantages. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiments 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 snagging grinder comprising a longitudinally movable carriage, power operated means on said carriage to traverse said carriage longitudinally in either direction, a transversely movable slide on said carriage, slidably mounted power operated means operatively connected to said slide and arranged to traverse said slide transversely in either direction relative to the carriage, a carrier adjustably and flexibly supported on said slide, a motor driven rotatable grinding wheel on said carriage, an adjustably mounted Weight on said carrier, means including a nut and screw mechanism on the carrier for adjusting the position of the weight relative to the carrier, and means including a power operated means on said carrier operatively connected to rotate said screw so as to actuate said nut and screw mechanism to facilitate varying the pressure of the grinding wheel relative to the work piece being ground.

2. A snagging grinder comprising a base, a longitudinally movable carriage on said base, spaced guideways on said base to support said carriage, power operated means on said carriage operatively connected to traverse said carriage longitudinally in either direction, a transversely movable slide on said carriage, guideways on said carriage for supporting said slide, slidably mounted power operated means operatively connected to said slide and arranged to traverse said slide transversely in either direction, a carrier flexibly supported by said slide, a trunnioned support on said slide for said carrier which is arranged to facilitate a vertical and a tilting adjustment of the carrier relative to the slide, a motor driven rotatable grinding wheel on said carrier, and spaced independent adjustable connections between the opposite ends of said slide and said carrier whereby the carrier may be adjusted vertically and may be tilted in a vertical plane to facilitate a surface grinding on a stationary work piece.

3. A snagging grinder comprising a longitudinally movable carriage, a power operated means on said carriage operatively connected to traverse said carriage longitudinally, a transversing movable slide on said carriage, power operated means on said slide operatively connected to traverse said slide transversely relative to said carriage, a carrier movably and flexibly supported by said slide, a trunnion support on said slide for said carrier which is arranged to facilitate a vertical and a tilting adjustment of the said carrier, a swing frame grinder including a motor driven rotatable grinding wheel supported on said carrier, and independent adjustable connections between the opposite ends of the said slide and said carrier whereby the carrier may be adjusted vertically and tilted in a vertical plane.

4. A snagging grinder, as claimed in claim 3, in combination with the parts and features therein specified of an adjustably mounted weight on said carrier, and means including a nut and screw mechanism operatively connecting the weight with the carrier to facilitate adjusting the position of the weight relative to the carrier so as to vary the grinding pressure of the grinding wheel upon the work piece being ground.

5. A snagging grinder, as claimed in claim 3, in combination with the parts and features therein specified of an adjustably mounted weight on said carrier, means including a nut and screw mechanism interposed between the carrier and the weight for adjusting the position of said weight relative to .the carrier, and means including a power operated mechanism on said carrier operatively connected to actuate said nut and screw mechanism to facilitate adjusting the position of the weight relative to the carrier so as to vary the grinding pressure of the grinding wheel upon the work piece being ground.

References Cited in the file of this patent UNITED STATES PATENTS 1,166,640 Shaw Jan. 4, 1916 1,413,928 Mummert Apr. 25, 1922 1,553,601 Easton Sept. 15, 1925 1,800,307 Marschke Apr. 14, 1931 2,073,400 Cumming Mar. 9, 1937 2,308,842 Wilson Jan. 19, 1943 2,618,912 Cushman Nov. 25, 1952 FOREIGN PATENTS 610,728 Germany Mar. 18, 1935

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