US527064A

US527064A - And danbury

Info

Publication number: US527064A
Authority: US
Publication date: 1894-10-09
Anticipated expiration: 1911-10-09

Description

(No Model.) M. C. JOHN SON.

DRIVING QLUTCH- No. 527,064. I Patented 0011.9.1894.

UNITED STATES MOSES C. JOHNSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE T. 85 B.-

PATENT QFFICE.

TOOL COMPANY, OF PORTLAND, MAINE, AND DANBURY, CONNECTICUT.

DRIVING-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 527,064, dated October 9,1894.

Application filed January 20, 1894. Serial No- 497|4=93. (No model-l To all whom it may concern:

Be it known that I, MOSES C. JOHNSON, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Driving-Clutches, of which the following is a specification.

The invention relates to the class of clutches that are adapted to be connected with the live spindle of a lathe or the equivalent part of a similar machine for centering and holding the blank to be operated upon, and the object is to provide a simple'and cheap device of this class havingpositive centering and clutching means that will quickly grasp and firmly hold the blank so that it will be correctly rotated with the spindle, whereby the work can be easily and quickly placed in and removed from position in the machine, or replaced in the same position after removal, as often as desired.

Referring to the accompanying drawings: Figure 1 is a side view of one form of clutch. Fig. 2 is a view of the face of the same. Fig. 3 is a central section, illustrating its use in connection with the end of a drill. Fig. 4 is a side view of a modified form of the clutch. Fig. 5 is a face view of this latter form. Fig. 6 is a central section of the same, showing the shank of a drill engaged by the clutch. Fig. 7 is a detail view of the driving finger; and Fig. 8 is a view of the end of the drill shank shown in Fig. 3.

The body of the clutch is usually turned to shape from steel, with a shank, 1, adapted to engage the driving spindle of a lathe or similar machine, and a head, 2, that has the centering and clutching parts. This clutch is more particularly adapted and intended for use in connection with the turning of drill blanks and when it is to be used for clutching the squared end of such a blank the head is preferably provided with a male centering part, which consists of a small projecting cone, 3, that is adapted to fit into the female centering socket, 4., or indentation made in the end of the shank, 5, as shown in view 3.

In a socket or chamber, 6, in the face of the head on one side of the center is placed a grasping plunger or finger, 7 that is normally thrust outward by means of a spring, 8; a

small pin, 9, working in a slot being provided to prevent the complete removal of the finger from its chamber. The front side of the outer or projecting end of this finger is provided with a flat surface, while the back edge is usually rounded oi, as shown in Fig. 7, and in the end of the blank to be operated upon, as far from the axis as the finger of theclutch head is from the centering cone, a recess, 10, is milled with one flat wall for the engagement of the fiat face of the finger.

When the clutch is placed in engagement with the live spindle of a machine anda blank provided with a centering indentation and finger recess, as shown in Figs. 3 and 8, is forced up against the face of the clutch, the centering parts fit together while the finger is forced back against the spring in its chamber by the end of the blank until the clutch rotates, or the blank is rotated, and the finger comes around to its recess and then springs forward into it so as to catch against or grasp the flat wall of the recess and drive the blank forward with it.

If the clutch is to be used with a blank having a tapering end, as is the case with small twist drills, the head instead of being provided with a projecting cone, has a conical female recess, 11, into which extends the tapering end, 12, of the blank to be clutched, as shown in Fig. 6; and when the device is to be used for rotating blanks of small diamlater, of course, the head may be reduced, as

shown in Fig. 4, and the clutching finger located near the axis. By means of this construction, a blank or piece to be turned can be quickly made to engage the clutch by fitting the conical centering parts together and then turning either the clutch or the blank until the finger springs outward and grasps the walls of its recess in the end of the blank.

The clutch is cheaply formed with either a male or a female conical part for centering the blank and the grasping finger very securely engages its recess, so as to firmly revolve the blank, which can be as quickly removed as placed in position to be operated upon. This construction also permits a blank once centered to be removed and inspected or subjected to other operations and then quickly returned to the grasp of the clutch without any careful manipulation to obtain and insure the original centers, so that it can be further turned on the same centers, if desired.

I claim as my invention- As a new article of manufacture, a tool having a shank and a head with a fixed conical center on the axis of the tool, said head being smaller in diameter than the part it is to engage when in use, and a spring plunger pro- 1 o jecting from the face of the head on one side of the axis of the tool for engaging a bearing on the end of the part to be rotated, substantially as specified.

MOSES O. JOHNSON.

Witnesses:

EDMUND TWEEDY, CHARLES H. WILCOX, J r.