US902008A - Drill. - Google Patents

Description

F. E. SNYDER.

DRILL.

APPLICATION FILED P33. 7, 1908.

Patented 0011.27, 1908. I

8 SHEETS-SHEET 1.

INVENTOk 5,

Altomy F. E. SNYDER.

DRILL.

APPLIOA'IIOH FILED FEB-"l, 1908.

Patented 001;. 27, 1908.

3 SHEETS-SHEET 2.

F, Bi SNYDER.

DRILL.

APPLIOATIOIPILED FEBJ, 1908.

Patented Oct. 27,1908.

4s SHEETS-SHEET a.

INVENTOR v Allarney PATENT OFFICE.

- UNITED sTATEs FRANK EDWARD SNYDER, OF MASSILLON, OHIO. I

DRILL.

hereby declare the following to be a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. i

This invention relates to improvements in drills, and more particularly to such as' are etc.

adapted for use in drilling coal, rock, metal,

Many hand drills nowin use comprise a threaded feed-bar or rod to which the drill and its chuck are rigidly secured, so that in use, by rotating th1s feed-rod, the drill is forced into the coal with a speedcommensw rate with the size of the thread on said bar, varyin from eight to twelve threads'per inch, depen in upon the hardness of the material bemg dril ed. Such a device requires a comparatively fine thread, as in drilling, hard spots in coal, such as sulfur, stone, etc., are

often encountered and through which the drill could not be forced were the feed-rod provided with a coarse thread. The fine thread (V shaped in cross section) on the feed-rod causes considerable friction and soon wears out, frequently necessitating the recutting of the threads both on the feederod and in the thread box through which it passes.

With a drill as heretofore constructed, on the lines above mentioned, it isoften necessary when strikin a hard spot in the coal, to remove the drill as it cannot be forced in further until the hard substance has been broken with a bit or lon chisel and hammer, because the drill cannot e turned without feeding or turning the feed-rod.

The object of my present invention is to obviate the defects of drills as heretofore conbecome dull so as to cause too much pres-.

sure agaist the feed-rod or in .due strars. or. the device, the actuati: g means for the feedrod will be caused to rotate backwardly and said feed-rod to remain stationary; but fol- Specification of Letters Patent. Application filed February 7, 1908. Serial No. 414,116.

Patented Oct. 27, 1908.

I low up and feed again as the drill bit (which continues to rotate), cuts its way clear.

A further object is to construct a drill In such manner that the feed-rod can be rotated without rotating the drill bit and thus enable the bit to be withdrawn in case of clogging and at the same time clean the holel'of chips which may have caused such clogging.

A further object is to construct the inachine in such manner that the feed-rod and:

drill bit can be rotated simultaneously at dif-' ferent speeds or at the same speed.

, A further object is to provide a drlll in which the drill rod is rotatable in the feedrod, which shall be capable of being manipus 'lated in a manner to provide for all contin gencies which may arise during the rocess of drilling; and which shall be simp e in construction, and easy to operate.

'With these objects in view the invention consists in certain novel features of constructionand combinations of arts as hereinafter set forth and pointed out 111 the claims.

" In the accompanyingdrawin s, Figure 1 is a side elevation of a drill embodying my improvements. Fig. 2 is a view in end eleva-. tion and partly in section. .Fig. 3 is a plan View. Fig. 4 is an enlarged sectional view illustrating the gearing between the drill rod and feed-bar. Fig. 5 is a detail view of the actuating mechanism. Fig. 6 is a view of the ear housing. Fig. 7 is a view illustrating t e manner of connecting the arts of the actuating mechanismto cause t e feed-bar and drill rod to rotate together at the same speed, and Fig. 8 is a view of an attachment to be used for operating the feed-bar independently of the drill-rod.

1 re resents a standard or supporting post, to the% I oted and provided at its ends with pointed feet 3 to engage. the floor of a mine. The standard 1 comprises two members 56, theupper member 5 telescoping into the tubular member 6 and held at any desired vertical adjustment by means of a pin 7 passing through holes in the member 6 and any oneof a series of holes 8 in the member 5. The upper member 5 of the standard is made with a threaded socket to receive a screw 9, the upper .end of which terminates in a pointed pin 10 to engage the roof of the mine. The screw 9 can be turned to clamp ower end of which a cross-bar 2 1s plvthe standard in position, by means of an arm or lever 11. In order to prevent the pin 7 from becoming lost it is attached to the standard by means of a chain 12.

A split sleeve 13 is adjustably secured to the standard 1 and is provided with a yoke 14 made integral therewith. The arms of the yoke 14 are provided with bearings 15 for trunnions 16' projecting laterally from a housing 17 and these trunnions can be placed in position on the bearings 15 in the arms of the yoke through openings 18 in the tops of said arms. members hinged together and each member is provided internally with threads to mesh with the threads of a tubular'feed-rod or bar 19'. The members of the two-part housing 17 are normally locked together by means of a bolt 20 pivoted to one member of the hous ing, passing between lugs 21 on the other member of said housing and provided with a thumb nut 22 to engage said lugs.

The rear end of the feed-rod or bar 19 is madewith a smooth portion upon which a gear-housing 23 is loosely hung. This housing comprises two members bolted together and provided with depending projections which cooperate to form an arm24. This arm may constitute a handle for a purpose hereinafter explained and it also serves to receive the socketed upper end of a pin 25 secured thereto by means of a thumb-screw 26, and to the oin 25a weight 27 is removably attached by means of a thumb screw 28,said weight serving to maintain the gearing housing 23 and the gearing therein,

in proper position during the operation of the machine and at the same time permitting said housing and gearing to move forwardly during the feeding of the drill.

A gear-wheel 29 is secured to the smooth ortion of the feed-rod or bar within the ousing 23 and a smaller gear-wheel 30 is secured to the drill-rod 31 which passes through and projects a short distance rearwardly be yond thefeed-rod or bar 19. A short shaft 32 is mounted in the housing 23, parallel with the feed-bar and drill-rod, and to this short shalt two gears 3334 are secured. The gear 33 is approximately the same size as the ge ar 30 and meshes therewith, while the gear 32 is smaller and meshes with the gear 29. Theseveral gears are protected by means of a gear-case 35 secured to the h0us ing 23.

A chuck 36 is secured to the forward end of the drill-rod 31 for the reception of abit 37. To the rear end of the drill-rod which projects beyond the rear end of the feed-bar and gearing an operating handle or lever 38 is at tached. This lever comprises two members adjustable longitudinally with relation to each other and secured at any desired adjustment by means of a threaded pin 39 and thumb-nut 40. The free end of this adjust- The housing 17 comprises two able operating lever is provided with a suit-- able hand grip 4 1. It 1s apparent that if it be desired to operate the machine by means of a motor, the latter may be connected by means of a flexible shaft or otherwise with the rear end of the drill rodand the hand lever above described dispensed with.

From the construction and arrangement of parts above described it will. be seen that when the operating'lever is manipulated, motion will be transmitted directly to the drill-rod for rotating the same and that simultaneously the feed-bar will be rotated through the medium of the gears at a slower rate of speed. During this operation the gear-housing will be maintained )endulous on the feed-rod by the action of t 1e weight 27, but, as is a parent, may travel forwardly with the eed-rod during the operation of the machine. If, during the drilling operation the drill-bit should become stuck 'on account of the clogging of chips in the hole beingbored, the gear-housing can be revolved so as to transmit through the gearing a backward rotation of the feed-rod without rotating the drill-rod, and thus the bit may be withdrawn from the hole and the chippingswhich caused the clogging removed at the same time. To facilitate such operation of the gear-housing, the weight 27 may be removed and the arm 24 used as a handle,- or if desired a hand-wheel 42 may be attached to the gear-housing and to facilitate such attachment the hand-wheel 42 is provided with a socketed block 43 which is removably attached to the arm 24.

If, durin the normal operation of the machine, the drill bit should engage a very hard spot in the material or become dull so as to cause too much pressure on the feed-bar or undue strain on the machine, the gear-housing will revolve backwardly andicause the feed-bar to remain stationary, but as soon as the hard spot shall have been penetrated by the bit, the feed-bar will resume its function,

the resistance which had caused the gearadjusting the weight 27 downwardly on the pin 25 to give the necessary pressure .or strength of feed.

Assuming that the feed-bar 19has four threads per inch and that the gears are such that the feed-bar revolves once while the drill-rod makes two revolutions (the gearhousing remaining stationary), the machine will feed one inch in ei ht turns of the operating lever 38. ShouTd the operator not wish to use the weight 27 he can remove it and by holding the arm 01' handle 24 the device will feed one inch in eight turns of the hold the gear-housin crank or lever 38, and if at any time there is too much strain on the device or its operation is too hard, the crank or lever 38 can be released occasionally by the operator and the housing 23 thus allowed to revolve bacl wardly and stop the feed until the dril-l-bit has cut its way and the excessive pressure,

thereby removed. The operator may then manner above explained when the machine lating the feed, becomes ineffectual.

is disposed in a position which is horizontal or approximately so. When however, it is necessary to dispose the drill in a position approximating the vertical, the automatic action of the weight 27 in controlling or regpn such case it will benecessary for the operator to hold the gear-housing 23 in proper position and this may be readily accomplished bymeans of the arm or handle 24 or by means of the hand-wheel 42 attached to saidgear-housing in the manner hereinbefore explained. By holding the handle 24 or the and-wheel 42, the device must feed at whatever speed it is geared, but by releasing said handle or handwheel so as to allow the gearhousing 23 to revolve backwardly as the pressure becomes too. strong or the operating lever turns too hard, the device can be controlled perfectly and the pressure or feed increased or diminished, as occasion may require.

Incident to the construction of my improved drill, I am enabled to use a very coarse thread on the feed-bar and control the speed of feed by varying the size of gears 3234,' which makes the device quite durable and easy to operate. As the feed-bar and drill-rod can be operated independentl I am enabled to control the feed to suit al kinds of work with the same machine. When turning the operatin crank or lever the drill rod turns also whet er the feed-rod is rotated or not, and thus there is little chance for the drill-bit to become'clogged in the hole being drilled, as by stoppin the feed and continuing to turn the drill-r0 the I bit will clear itself.

Should it be .desired to use the machine inany substance which is soft enough to permit the full feed of the feed-bar to be transmitted to the drillod,-this may be accomplished by removing the weight 27 from the housing and attaching to the arm 24 a fork 44 which is made to embrace the operating crank or lever 38. By now operating the crank or lever 38 the feed-bar and the drillrod will be caused to rotate together at the same speed and thus the full feed of which 23 by means of the the feed-bar is capable is transmitted to the drill-rod.

Having fully described my invention what I claim as new and desire to secure by Letters- Patent, is,- 7

1. In a drill, the combination with a threaded housing and a tubular threaded feed-bar passing through the same, of a drill rod ext-ending through the tubular feed-bar, gears on the feed-bar and drill-rod, a gear-housing loosely mounted on and supported by the feed-bar, and gears sup orted by said housing and in constant mesi with the gears on the teed-bar and drill-rod.

2. In a drill, the combination with a threaded housing and a tubular threaded feed-bar passing through the same, of a drill-rod passing through the feed-bar, a

pendulous device mounted on the feed-bar,

gears carried by said endulous device and gears secured respectively to the feed-bar and drill-rod and meshing with the gears carried by the pendulous device. I

3. In a drill, the combination with a threaded housing and a tubular threaded feed-bar passing through the same, of a drill rod passing throu h the feed-bar, a gearhousing mounted oosely on the feed-bar, connected gears carried by said housing, gears on the feed-bar and drill-rod and meshing with said connected gears, and a weight adjustably attached to the lower end of said gear-housing.

4. In a drill, the combination with a threaded housing and a tubular-threaded feed-bar passing through the same, of a drillrod passing through the feed-bar, a gearhousing mounted loosely on the feed-bar and capable of rotation thereon, connected gears carried by said gearhousing, gears secured respectively to the feed-bar and drill-rod and meshing with said connected gears, and operating means attached to the drill-rod.

5. In afdrill, the combination with a threaded housing and a tubular threaded feed-bar passing throu h the same, of a drillrod passing through t e feed-bar, a pendulous device mounted loosely on the feed-bar,

connected gears carried by said pendulous device, gears secured respective y to the feed-bar and drill-rod and meshing with said connected gears and detachable means for permitting the feed-bar and drill rod to be rotated simultaneously at the same speed.

, 6. In a drill, the combination with a threaded housing and a tubular threaded feed-bar passing through the same, of a pendulous device mounted loosely on the eed-bar, connected gears carried by said pendulous device, a. drill-rod passin through the tubular feed-bar, gears secure. respectively to the feed-bar and drill-rod and meshing with said connected gears, an operating lever secured to the drill-rod and detachable means for connecting said pendulous' device with the operating lever to cause rotation of the feed-bar and drill-rod simultaneously at the same speed.

7. In a drill, the combination with a threaded housing and a tubular threaded feed-bar passing through the same, of a drillrod passing through the feed-bar, operating means secured to said drill-rod, a gear secured to the drill-rod, a gear secured to the feed-bar, a pendulous device mounted loosely on the feed-bar, connected gears carried by said pendulous device, and means for weighting the lower end of said pendulous device.

8, In a drill, the combination with a threaded housing and a tubular threaded feed-bar passing through the same, of a drillrod rotatable in said feed-bar and passing through the same, an operating lever secured to the drill-rod and comprising a plurality of members. adjustable longitudinally with relation to each other, gears secured respectively to the feed bar and drill-rod, a pendulous device mounted loosely on the feed-bar, connected gears carried by said pendulous device and meshing with the gears on the feed-bar and drill-rod, a weight, and means for adjustably attaching said weight to the pendulous device.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

FRANK EDWARD SNYDER.

Witnesses JOHN C. LOWE, JOHN O. GARRETT.

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