US1230993A - Grinding-machine. - Google Patents

Description

H. BUERK & A. W. HAPPEL.

GRINDING MACHINE.

APPLICATION HLED JUNE 15. I916.

1,230,993,. PatentedJune 26,1917.

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UNITED STATES PATENT OFFICE.

HAN-S BUERK AND ALBERT W. HAPPEL, OF BUFFALO, NEW YORK, ASSIGNORS TO THE COLUMBUS DIE, TOOL & MACHINE COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

' GRINDING-MACHINE.

Specification of Letters Patent.

Patented June 26, 1917.

Application filed June 15, 1916. Serial No. 103,755.

To all whom it may concern:

Be it known that we, HANS BUERK and ALBERT \V. HArrnL, citizens of the United States, residing at Buffalo, in .the county of Erie and State of New York, have invented new and useful Improvements in Grinding- Machines, of which the following is a specification.

This invention relates ,to a grinding Inagrit, &c., which is thrown off from the front or exposed Part of the grinding wheel, and also to improve the means for supporting the workpiece. in its operative position relative to the front or exposed part of the grinding wheel.

In the accompanying. drawings:

Figure 1 is a front elevation, partly in section, of a grinding machine embodying our improvements. Fig. 2 is a vertical transverse section taken on line, 2-2, Fig. 1. Fig. 3 is an end elevation of the machine viewed from the left hand end thereof. Fig. 4c is a vertical transverse section taken onthe cor-- respondingly numbered line in Fig. 1. Fig. 5 is a fragmentary vertical section, on an enlarged scale, taken on line 55, Fig. 3. Fig. .6 is a vertical section, on an enlarged scale, taken on line 6-6, Fig. 1.

Similar characters of reference indicate. corresponding parts throughout the several views.

1 represents the main frame or base of the machine which is preferably made hollow and adapted to have its interior space connected with an exhausting .deviceof any suitable character. The connection between this exhausting device and thehollow frame or base may be effected in any suitable manner, for instance by setting the open lower end of the base over a conduit or passage 2 in the floor of the building leading to the air exhausting device. Or if desired the lower part of the main frame may be provided with a rearward extension 3 having a downwardly and. rearward-1y inclined wall. 4 which contains an outlet or discharge opening 5 over which an elbow or angular pipe 6 may be secured in different positions about the axis of this opening by means of bolts 7 or otherwise. This elbow may therefore be turned at different angles for connection with an exhaust conduit leading to an exhaust device whereby a vacuum may be created within the hollow frame or base and any dust or dirt contained in the base or the parts connected therewith may be carried away from the machine.

Onthe upper part of the. frame or base the same is provided with bearings 8 in which is journaled a horizontal longitudinal arbor, spindle or shaft 9 which may be turned by any suitable means, for-instance by means of a belt passing around a tight pulley 10 secured to this shaft between its bearings. When it is not desired to operate the machine this belt may be shifted upon the loose pulley to an idle pulley 11 on this arbor adjacent to its companion tight pulley. The shifting-of the driving belt from the tight pulley to the loose pulley and vice versa may be effected by any suitable form of belt shifter. At its opposite ends the arbor is provided with grinding wheels or disks 12, 12 which may be constructed of any suitable material. The employement of two grinding wheels produces a double machine and our improvements are represented in the drawings as associated with both of these wheels but in the following description as to the details of our improvements relating to one of these wheels it is to be understood that this description applies equally to the mechanism associated with both of these wheels.

Inclosing the rear part of each of the grinding wheels is a hood which comprises a fixed curved wall 13 extending circumferentially around the rear, top and bottom parts of the periphery of the grinding wheel, a fixed inner wall 14 formed preferably in one piece with the curved peripheral wall and arranged along the inner side of the grinding wheel, and a movable outer wall 15 arranged along the outer side of the grinding wheel and movably connected with the peripheral wall. The inner fixed wall is provided with an opening or notch 16 through which the adjacent part of the rotatable arbor passes and the same is rigidly mounted on the adjacent part of the main frame by means of bolts 17, as shown in Fig. l or by any other suitable means. The movable outer wall of the hood is preferably pivoted at its rear edge to the rear part of the peripheral wall by means of a hinge 18 which has its pintle arranged substantially upright, as shown in Fig. 3. By this means the outer wall ofv the hood may be swung outwardly so as to clear the space adjacent to the outer end of the arbor and permit a grinding wheel to be applied to the arbor and also removed therefrom with ease and convenience. The outer movable wall of the head has its front part detachably connected with the fixed parts of the hood by a catch which permits of readily connecting and disconnecting the same. Th preferred form of catch for this purpose which is shown in Figs. 1, 3 and 6 comprises a vertically sliding locking bolt 19 guided in a vertical guideway 20 formed on the upper part of the movable hood wall and adapted to engage its upper operative end with a locking recess or opening 21 in the upper part of the peripheral wall of the hood, a spring 22 arranged within the lower part of the guideway 20 and bearing at its lower end against the bottom of this guideway and at its upper end against th lower end of the locking bolt, a stop or shoulder 23 ar ranged on the locking bolt and engaging with a stop 24 on the movable wall for limiting the upward movement'ofthelocking bolt under the action of its spring 22 and a horizontal releasing shank or shaft 60 journaled lengthwise in a suitable bearing on the movable hood wall and provided within a pocket 25 of this wall with a laterally projecting pin 26 engaging with a shoulder 27 on the locking bolt and also provided outside of the movable hood wall with a handle 28 for operating this shank. Upon turning the shank 60 in the proper direction by means of its handle the locking bolt may be withdrawn from the locking recess and the movable wall of the hood may be swung outwardly. Fastening of the front part of the movable hood wall to the peripheral wall thereof is effected by simply moving the outer wall toward the peripheral wall whereby the locking bolt automatically snaps into the locking recess, this being effected by making the upper operative endof the looking boltinclined for this purpose, as shown by dotted lines in Figs. 1 and 6 similar to an ordinary door catch.

29 represents a spark shield which is adapted to'extend across the gap between the upper front part of the grinding wheel and the front end of the peripheral wall of the hoodfor the purpose of preventing the sparks which fly off the grinding wheel from hitting the operator. In its preferred. formthis spark shield is constructed of curved form the radius of which is consid erably less than the radius of the hood and the center or axis of this spark shield being also arranged eccentric to and at a point above the axis of the grinding wheel and hood. At its opposite curved edges this spark shield slides in correspondingly curved guide grooves 30 formed on the opposing sides of two flanges 31, 31 which project upwardly from the front end of the peripheral hood wall, thes guide grooves being so arranged that the spark shield may be moved circumferentially therein and permit the front or lower end of the spark shield to be extended across the front end of the peripheral hood wall and toward the perriphery of th grinding wheel so as to project across the gap between the periphery of this wheel and the peripheral wall of the hood, as shown by full lines in Figs. 3 and 4. As the periphery of the grinding wheel wears away the spark shield is gradually moved towardthe grinding wheel in the same measure and thereby always protects the operator from the sparks which would otherwise fly forward from the wheel. The spark shield may beheld in its adjusted position by various means but the device shown in the drawings is satisfactory and as there shown the same consists of a clamping screw 32 arranged in the threaded opening in the rear part of the spark shield and engaging with a curved rib '33 on the exterior of the upper front part of the peripheral wall of the hood, as shown in Figs. 1, 3 and 4. The backward movement of the spark shield is preferably limited by means of an upwardly projecting stop or shoulder 34 arranged on the peripheral hood wall in the path of the rear end of the spark shield, as shown in Fig. 4.

For thepurpose of carrying away the dust, dirt and grit from the hood a connection is made between the interior of the hood and the interior of the hollow base or frame so that the hood communicates with th suction device through the medium of the hollow base. This connection is preferably effected by means of a tubular inclined neck 35 extending from the lower part of the fixed walls of the hood downwardly and inwardly to an opening 36 in the adjacent end wall of the hollow frame, as shown in Figs. 1, 3 and 4. By means of this connection any dust, dirt or grit entering the hood is withdrawn from the same by the suction device through the neck 35 into the hollow frame and then carried out from the latter and discharged to any suitable place- In order to catch the sparks, grit, etc., which are thrown downwardly from the exposed front part of the grinding wheel while a workpiece is held against the same means are provided for catching thisjgrit, dust, etc., and causing the same to be carried away by the suction device which is connected with the hollow base and the hood of the machine. In its preferred form the means which catch the grit and dust from the front of the grinding wheel. comprise a scoop or pan 37 which is arranged below the exposed a front part of the grinding wheel and provided on its inner side with a horizontal tubular neck 38 which is mounted to turn in a vertical plane transversely of the machine in a bearing 39 formed on the adjacent end wall of the hollow base. This neck 38 places the catch pan or scoop in communication with the interior of the hollow base so that any material which is discharged into this pan or scoop is sucked out of the same through its neck and into the hollow from whence it is carried off by the suction device connected with thelatter. The scoop or pan is adjusted in accordance with the size of the grinding wheel and also the character of the grinding wheel and also the size or character of the workpiece which is being operated upon. This is preferably effected by securing the scoop to its-neck and turning the latter in the bearing 39 on main frame in a vertical plane transversely of the machine so that the scoop can be moved forwardly and baokwardly relatively to the grinding wheel. After the scoop has been adjusted to the desired position the same is held in place by means of a clamping screw 40 arranged in a threaded opening in the bearing 39 .and engaging with a peripheral groove 41 in the neck of the scoop, as shown in Figs. 1 and 2. This clamping screw and groove 41 permit of this rotary adjustment of the scoop but prevent the neck 38 from being withdrawn from its bearing.

In order to afford access to the lower part of the scoop or pan and the outlet neck of the same which communicates with the hollow base for the purpose of conveniently cleaning out any accumulations in the bottom of the pan and its neck, a cleaning opening 42 is provided on the outer lower part of the pan opposite to the outlet neck 38, as shown in Fig. which opening is normally closed by a gate,'door or-lid 43 which is pivotally connected at its lower end with the lower partof the scoop by a hinge 4A. In its closed position this cleaning out door is arranged in an inclined position and somewhat inwardly beyond a vertical line drawn through the axis of its hinge so that the same remains in its closed position by gravity. The suction device which exhausts the air from the pan also operates to hold the cleaning out door in its closed position when the machine is in use. 7

Means are provided for supporting the workpiece while the same engages the front or operative part of the grinding wheel, these means being movable either into or out of their operativeposition so that the grinding wheel may be used either for grinding such articles without a support or the grinding wheel may be used while the article which is being operated upon is supported. As best shown in Figs. 1, e, 4 and 5- this workpiece supporting mechanism in its preferred form is constructed as follows:

45 represents a horizontally swinging bracket or supporting arm which is pivoted at its rear end by means of an'upright hinge 46' on the adjacent end wall of the main frame so that the bracket swings in a horizontal plane, the axis of the hinge at being preferably inclined rearwardly slightly, as

shown in Figs. 3 and 4, so that the bracket will tend to remain in its rearward inoperative' position by gravity. On its upper front part, this bracket has secured thereto the lower section or stand 47 of a tool rest which lower section is capable of horizontal or ra dial adjustment on the bracket toward and from the aXis of the latter. This adjustment is preferably effected by engaging the lower side of the lower tool rest section with a guideway 48 in the upper side of the bracket and these parts are held in position after adjustment by means of a clamping screw or bolt 4E9'projecting from the underside of the lower tool rest section through a longitudinal slot 50 in the outer end of the bracket, and a screw nut 51 applied to the lower end of the clamping bolt 49 and bearing against the underside of the bracket, as shown in Figs. 1 and 4:- On the upper part of the lower tool rest section is arranged the upper section or'head 52 of the tool rest which latter is capable of vertical adjustment on the lower section by means of a clamping bolt 58 projecting forwardly from the lower tool rest section through a vertical slot 54 in the lower part of the upper tool rest section and a screw nut 55 arranged on the front end of the clamping bolt 53 and bearing against the front side of the upper tool rest section. By moving the lower tool rest section horizontally inwardly or outwa'rdly on the bracket and moving the upper tool rest section vertically on the lower tool rest section, the top of the upper tool rest section may be adapted to the size of the grinding wheel and also the character of the work which is to be ground on the wheel.

When the tool rest is in use the bracket is swung forwardly so that the tool rest stands in front of the peripheral part of the grinding wheel, as shown by full lines in Figs. 1, 3 and 4, but when the tool rest is not required for use the same is swung baokwardly out of the way into the position shown by dotted lines in Fig. 3. To permit of thus moving the tool rest into and out of its operative position a clamping device is providedfor detachably connecting the bracket with the adjacent part of the mainframe. In its preferred form this .spindle 57 journaled horizontally in a bearing 58'on the bracket and provided at one end with an external screw thread 59 engaging with an internal screw thread in the tubular stop 56 while its opposite end is provided with a handle 61 which bears against the outer side of the bracket ,while the latter is in its operative position, thereby securely holding the bracket and the parts mounted thereon in the proper position to permit of reliably supporting the workpiece on the tool rest while the grinding wheel is operated on the same. When the tool rest is not required for use the spindle 57 is turned backwardly sufficiently to completely disengage its inner externally screw threaded end from the internal screw thread of the stop boss, thereby permitting the bracket and the parts associated therewith to be swung rearwardly adjacent to the rear part of the hood where it is out of the way when not required for use. At this time the fastening spindle is prevented from becoming disconnected from the bracket by reason of the handle 61 arranged on one side of the bracket and a shoulder .62 arranged on this spindle on the opposite .59 of the spindle to be fully unscrewed from the stop boss 56 before swinging the bracket rearwardly into its inoperative position. The threaded end 59 is arrangedin the recess 7 0 when the tool rest is not in use thereby preventing this thread from becoming covered with grit and dirt at this time and retaining the same always in good condition for promptly and easily connecting the bracket in its operative position with the frame. I

This grinding machine as a whole is very compact in construction the several parts are easily adjusted and not liable to get out of order and permit of securing the maximum output of the machine under sanitary conditions inasmuch as all the dirt and grit is effectually carried away from the machine the instant they are generated and the workman is also protected from flying sparks, thereby promoting the health and comfort of the operator.

l/Ve claim as our invention:

1. A grinding machine comprising a rotatable arbor, a grinding Wheel mounted on said arbor, and a hood inclosing said wheel and having a fixed curved Wall extending around the periphery of the Wheel, a fixed side wall arranged on one side of the wheel and having an opening through which said arbor passes, a movable side wall arranged on the opposite side of said wheel and pivotally connected at its rear edge with said curved wall and a catch which detachably connects the front part of said movable wall with the front part of said curved wall comprising a guideway arranged on said movable wall, a locking bolt slidable in said guideway and adapted to engage its outer end with a locking recess in said curved wall and provided with a shoulder, a spring mounted on said movable wall and engaging with the inner end of said locking bolt for holding the same in engagement with said locking recess, and a rockingshank journaled on said movable Wall and provided with a handle and witha laterally projecting pin engaging with the shoulder of said locking bolt.

2. A grinding machine comprising a rotatable grinding wheel, a hood inclosing the rear part of the sides and periphery of said wheel and means for closing the gap between theupper part of the periphery of the wheel and the upper part of said hood comprising a curved guideway composed of two guide grooves arranged on the upper part of said hood and facing each other, a curved shield slidable at its opposite longitudinal edges in said guide .grooves and means for holding said shield in place consisting of a set screw arranged on said shield and engaging said hood.

3. A grinding machine comprising a hollow base or frame adapted to be connected with an exhausting device, a grinding wheel rotatably mounted on said base, a hood in closing the rear part of said wheel, a scoop or pan arranged below the front part of said wheel and having a horizontal tubular neck which is rotatable in an opening in said base and connects the interior of the scoop and base.

4-. A grinding machine comprising a hollow base or frame adapted to be connected with an exhausting device, a grinding wheel rotatably mounted on said base, a hood inclosing the rear part of said wheel, a scoop or pan arranged below the'front part of said wheel and provided on one side of its lower part with a tubular neck which communicates with the interior of said base and provided on the opposite side of its lower part with a cleaning opening, and a door movably mounted on said scoop or pan and adapted to close said cleaning opening.

HANS BUERK. ALBERT W. HAPPEL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 1). G.

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