US1178036A - Grinding-machine. - Google Patents

Description

c. M. 'STRETCHER.

GRINDING MACHINE. APPLICATION FlLED AUG-23,1915.

Patented Apr. 4, 1916.

Emma I Oarl Stretcher,

CARL M. STBETCHER, OF

SPRINGFIELD, OHIO, ASSIGNOR OF ONE-HALF TO CHARLES H.

STEPHAN, OF SPRINGFIELD, OHIO.

GRINDING-MACHINE.

To all whom it may concern:

Be it known that I, CARL M. Srnnronnn, a citizen of the United States, residing at Springfield, in the county of Clark and State of and useful Improvements in Grinding-Machines, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to grinding machines and more particularly to an electrically driven center grinder for lathes and the like.

The object of the invention is to provide a compact self-contained electrical grinder which can be readily placed in position to grind the center of a lathe, or other part which is to be ground, and adjusted to bring the grinding wheel in proper relation to the part to be ground.

A further object of the invention is to provide a grinding machine of this kind in which the grinding wheel can be manipulated independently of the motor parts to cause it to travel over the work; and further, to provide a grinding machine of this kind which will be simple in its construction and operation and inexpensive to produce.

The accompanying drawing is a plan view, partly in section, of a grinding machine embodying my invention, showing the same applied to a lathe.

In this drawing I have illustrated one embodiment of the invention and have shown the same as mounted on the tool post of an ordinary lathe and arranged to grind the center of that lathe. It will be understood, however, that this is chosen for the purpose of illustration only and that the invention can be embodied in various forms and used for various purposes.

As here shown, the invention comprises a motor which consists of a frame or casing 1. having at its ends bearings 2 and 3 in which is journaled an armature shaft 4. Carried by this armature shaft and rotating therewith is a grinding wheel 5. In order that this grinding wheel may be caused. to travel over the work as the grinding is accomplished it is mounted for longitudinal movement relatively to the motor shaft and independently thereof, whereby it is possible to mount the motor in a fixed position and manipulate only the grinding Specification of Letters Patent.

Application filed August as, 1915. Serial No. 46,821.

Ohio, have invented certain new Patented Apr 1916.

wheel during the grinding: "operation. In the present arrangement the armature shaft is made hollow and the grinding wheel shaft, which is shown at. 6, is mounted in this hollow armature shaft for longitudinal sliding movement but is held against rotary movement relatively thereto. This may be accomplished in different ways but I have here shown the shaft 6 as having a longi tudinal groove 7 to receive a key or spline 8 carried by the armature shaft 4. Preferably, the groove is formed in that end of the shaft 6 opposite the grinding wheel 5 and extends to the end of the shaft. By this arrangement the grinding wheel and its shaft can be removed from the motor without interfering with the armature shaft and the key 8 can be placed near one end of the armature shaft where it is readily accessible. Suitable means are"'provided for imparting axial movement to the grinding wheel and in that form of the device here shown I have secured to the shaft 6 a collar 9 having a flange 10 which projects between the'arms of a yoke 11 formed on one end of an operating lever 12, the opposite end of which constitutes a handle, as shown at 13. This lever 12 is mounted between its ends on a bracket 1 1 which is preferably mounted on the motor frame or casing 1, as in this manner the device can be retained in its completely assembled condition while it is being moved from one position to another and the operating handle will be maintained always in proper relation to the shaft 6. The yoke 11 is preferably provided with two contact points 15 arranged on opposite sides of the flange 10 and tapered to permit the yoke to extend at different angles to the plane of the flange 10, thereby enabling the contact points of the yoke to be arranged close to the flange so that there will be little or no,

wheel may be regulated. Further, by placing the collar close to the adjacent endof the armature shaft thegrincling wheel and its shaft are held against axial movement and the wheel will rotate in a fiigedplane.

' the Work may be tion, What I claim The device may be mounted in any suitable manner and when the device is designed for the grinding of lathe centersI prefer to mount it in the tool post of a lathe. In the present drawing the device is shown so mounted with the grinding wheel arranged in position to grind the center. 16 of a lathe, which latter is of a well known construction. The motor frame or casing l is provided with an arm 17 which is rigidly secured thereto and is adapted to extend through and be secured in a tool post 18 of the usual construction. By adjusting the arm 17' in the tool post the grinding mechanism may be moved toward O-r away from the tool post and by adjusting the tool post in the usual .manner, either about its vertical axis or along the supporting frame, the position of the grinding mechanism may be further adjusted with respect to the work.

The operation of the device will bereadily understood from the foregoing description and it will be apparent that the device is self contained and may be quickly and easily moved as a whole from one point to another and that it can be placed in position upon a lathe frame or other suitable support by the mere insertion of the supporting arm into the tool post; and that the various adjustments necessary to bring the grinding wheel into proper relation to quickly and easily accomplished by the ordinary tool post adjustments. It will be further apparent that the construction is such that the device as a whole can be built at a very low cost and that the up-keep will be very low.

While I have shownand described one embodiment of my invention it will be understood that this has been chosen for the purposes of illustration only and that I do not desire to be limited to the details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

Having thus fully described my invenas new and desire to secure by Letters Patent, is

1. In a motor, a casing having bearings a grinding wheel shaft rotatably journaled and longitudinally movable in said 'bearings, a grinding wheel mounted on one end of said shaft, a flanged collar mounted on the other end of said shaft, said grinding wheel and flanged collar in connection with said casing acting as stops to limit the longitudinal movement of said shaft, and means in engagement with said flanged collar to move said shaftlongitudinally.

2. In a motor, a'casing having bearings, a grinding wheel shaft rotatably journaled and longitudinally movable in said bearings, a grinding wheel mounted on one end of said shaft, a flanged collar mounted on the opposite end of said shaft, said collar said bracket, said lever having a forked end in engagement with said flanged collar, whereby the'shaft is adjusted longitudinally. 4. In a motor, a casing having bearings, a shaft rotatably mounted in said bearings and movable longitudinally thereof, a grinding wheel mounted on said shaft, means comprising a lever pivoted to said casing for actuating the shaft to impart longitudinal movement thereto, said means also comprising means to limit the longitudinal movement of said shaft. -5. In a deviceof the character described, a motor comprising a hollow armature shaft,

a shaft mounted in said armature shaft for longitudinal movement and held against rotary movement relatively to said armaturev shaft, a grinding wheel carried by said last-mentioned shaft, means for actuating said last-mentioned. shaft to impart axial movement to said grinding wheel relatively to said armature shaft, and adjustable means mounted onv said second shaft to limit the longitudinal movement of said grinding wheel shaft.

In a motor, a casing having bearings,

a shaft rotatably mounted in said bearings and movable longitudinally thereof, a grinding wheel mounted on said shaft, means adjustably mounted on said limit the longitudinal movement thereof, and means in engagement with said adjustable means to impart longitudinal movement to said shaft.

7. In a device of the character described, a motorcomprising a frame having bearings, a hollow armature shaft journaled in said bearings, a grinding wheel shaft mounted in said hollow armature shaft for longitudinal movement relatively thereto and ings, a hollow armature shaft journaled in said bearings, a grinding wheel shaft mounted in said hollow armature shaft for longitudinal movement relatively thereto and held against rotary movement relatively shaft to thereto, a grinding wheel carried by said grinding wheel shaft, an actuating device mounted on said motor frame to impart longitudinal movement to said grinding wheel shaft, and an adjustable connection between said actuating device and said grinding wheel shaft.

9. in a device of the character described, a motor comprising aframe having bearings, a hollow armature shaft journaled in said bearings, a grinding wheel shaft mounted in said hollow armature shaft for longitudinal movement relatively thereto and held against rotary movement relatively thereto, a grinding wheel carried by said grinding wheel shaft, a bracket mounted on said motor frame; a lever pivotally mounted on said bracket and having a yoke at one end thereof, and a flanged collar mounted on said CARL M. STRETGHER.

Witnesses M. RAY \VEIKART, C. H. STEPHAN.

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