US1103783A - Drill. - Google Patents

Description

G. 0. LEOPOLD.

DRILL.

APPLIUATION HLBDBEPT. 11, 1913.

1 1 03,788. Patented Ju1y 14, 1914 Z SHEETS-EHEBT 1.

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G. O. LEOPOLD.

DRILL.

APPLICATION FILED SEPT. 11.y 1913.

Patented July 14, 1914.

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UNITED sTArEs PATENT Enron.

GEORGE o. LEOPOLD, OP PHILADELPHIA, PENNSYLVANIA, AssiGNOETo NORTH EEos iviro. oo., OP PHILADELPHIA, PENNSYLVANIA, n CORPORATION OE PENNSYLVANIA.

DRILL.

lSpecication of Letters Patent.

' Patented July 14, 1914.

To all 'whom 'it may concern Be it known that I, GEORGE O. LEoPoLD,.a citizen of the United States, residing 1n Philadelphia, Pennsylvania, have invented certain Improvements in Drills, of which the following is a specification.

The object of my invention is to provide a drill with automatic means for stopping longitudinal movement of the drill spindle when it reaches the extreme upper or lower position, and this is accomplished without interfering with the free rotation of the spindle.

In the accompanying drawings z-Figure 1, is a side view of the head of a bench drill illustrating my invention and showing the shifter in the mid-position; Fig. 2, is a front view with the shifter in the same position as in Fig. 1; Fig. 3, is a plan view; Fig. 4, is a sectional plan view on the line L -a, Fig. l; Fig. 5, is a perspective view ofthe pawl carrier; Fig. 6, is a perspective view of the pawl; Fig. 7, is a diagrammatic view showing the shifter in the feeding position and descending; Fig. S, is a view showing the pawl being shifted by coming in contact with the abutment in the lower position; and Fig. 9, is a view showing theipawl coming in contact with the abutment when in the upper position.

Referringl to the drawings, 1 is the fram of the drill in the present instance, which can be supported in any suitable manner according to the type of drill to which the invention is applied. This frame has a bearing 2 for the shaft 3 which is provided with a handle, although a pulley may be substituted for the handle when the drill is driven by power. Secured to the inner end of the shaft 3 is a bevel gear wheel 4 which meshes with a pinion 5 splined to the spindle 6. The spindle, in the present instance, has a longitudinal groove therein and a key on the pinion enters the groove so that while the spindle can move vertically in the pinion it must turn therewith.

7 is a bearing through which the spindle 6 extends. This bearing'rests upon the end of the pinion and has an extension forming an outer bearing for the shaft 3, as clearly shown in Figs. 1 and 2. In this bearing is a spring bolt 8 having a handle 9. When in the position illustrated in Fig. 2, this bolt is withdrawn clear of the groove in the spindle 6, but, when the handle 9 is shifted lfeed screw 10. The lower end of the feed screw rests upon a bearing 11 secured to the spindle, so thatv the pressure of the spindle, as the tool enters the work, is taken 'by this bearing. The upper end of the screw rests against a sliding bearing 12 which is `held to the spindle by a screw 13 and washer 14. This bearing isadapted'to slide on the :vertical guide 15 which is mounted on the lupper portion of the frame 1 and has a stop -16 to' limit the upward'movement of the sliding bearing 12.

Secured to the feed screw 10 is a ratchet wheel 17, and mounted between the end of the ratchet wheel and the bearing 12 `is a carrier 18 in 'which is mounted a spring pawl `19. j This spring pawl is free to turn in the carrier, as illustrated in Fig. 4, so as to feed either to the right or to the left. In the carrier is a notch 20 lto receive the handle 21 of the pawl so as to'hold the pawl` in either of the two positions in which v it is adjusted.

Secured to or forming part of the frame 1 is a` shifter 22. `In the present instance,

this shifter is securedto the frame by a screw 23 and has a lower projection 24 and an upper projection 25. The lower projection is in the path of the handle 21 of the pawl 19 when the pawl is descending, and

the projection 25 is in the path of the handle of the pawl when the pawl is ascending.

In order to cause thecarrier 18 to reciprocate, Iform an eccentric hole in the carrier,

`as illustrated in Fig. 4, and mount a roller 26 in a recess in the spindle 6, which forms a'cam so that, as the spindle rotates,'the carrier will be reciprocated; the carrier being pivotally mounted on a pin 27 projecting from the bearing 12.

Figs. 7, 8 and 9 are diagrams. In Fig. 7,

comes in contact with the projection 24 and is shifted to the position illustrated in Fig. 8, causing the arm to ride on the upper wall of the notch 20 and withdrawing theV pawl from engagement with the ratchet wheel 17, stopping the longitudinal movement of the spindle but not interfering with the rotation thereof. When it is wished to reverse the ratchet movement, the handle 21 is turnedto the position illustrated in Fig. 9, so that the, upper projection 25 of the shifterv 22 will be in the path of the handle 2l and, by reversing the rotation of the driving handle, the movement ,of the spindle and screw will be reversed and the ratchet feed will take place on theupward movement. When the handle 2l comes in contact with the projection 25, it is' caused to rotate` on the lower wall of t-he notch 20 and the pawl 19 will be withdrawn from the ratchet wheel. The spindle canthen berotatedwithout furthermovement of thek feedA screw. By this construction vertical movement of the spindle in s either'V direction is limitedV and there is no (Topics of this patent may be obtaincdif .j liability of the spindle, or the feed screw,

passing a, given point and jamming in the frame due to neglect ofthe operator.

,Iclaimr-f l.

1. .The combination in a drill, of a'frame;

ratchet wheel on the feed screw; a carrier; a spring pawlon the carrier for operating the ratchet wheel; anvarmon the pawl for shifting it so that it `will feed'either to the.-

e ltwo subscribing witnesses. a spindle; a feed screw von the'spindle; a? 'j right or to the left; a camon the spindle for actuating the carrier; ashifter on the frame having upper and lower projections, lone at one side andthe other yon .the opposite side of the carrier and in the path ofthe a'rm of the pawl, so that, when the feed screw reaches the limit of its downward movement,

the pawl will be automatically moved out ofl engagement with the ratchet wheel and, when the screw reaches the limit of its upward movement, the pawl will beautomatically thrown out Lof engagement with the ment with the ratchet wheel; and a shifter having an upper anda lower projection, one j on one side of the Vpawl and thev other on the opposite side thereof and in the path' of 4t-he arml when it is in either of its two eXtreme positions, so that, wheny the arm comes in Contact with one of the projections, the pawl will be thrown out of engagement with the :ratchet wheel. j l

ln testimony whereof, I haveA lsignedmy lname toqthisspeciication, in the presence of. f

n 4 Geenen oqLEoroLD. Witnesses: y Y i A RUSSELLQGRAFFINS,

XVM. A. BARR.

or five cents each,l by addressing the Commissioner of Patents Washington, D. C. i

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