US1904657A - Mining drill - Google Patents

Description

April 18, 1933. L, FELLAY 1,904,657

MINING DRILL Filed Feb. 12. 1932 Jawa c/// Patentecl Apr. 18, 1933 UNITED STATES PATENT orriclar- LUIS J. FELLAY, OF PEORIA, ILLINOIS, ASSIGNOR TO DOOLEY BROTHER-S, OF PEORIA,

\ ILLINOIS, A CORPORATION OF ILLINOIS MINING DRILL Application filed February 12, 1932. Serial No. 592,472.

My invention relates more particularly to electrically driven mining drills of the type shown in the application of Edward J. Dooley, Serial No. 281,04L9, filed May 28, 19 28.

One object of my invention is the provision of driving Connections whereby the thread bar may be continually rotated in one direction, and while being so rotated may be fed forward to drill, the forward feed stopped to finish the bottom of a hole, or fed backward to remove the drill from the hole.

;An other object of my invention is the prorision. of a simple yet effective controlling dovicc for the various feeds of the thread bar.

Other objects of my invention will appear and be described in the Specification.

The norelty of my invention will be hereinafter more fully set forth and specifically pointed out. in' the claim.

In the accompanying drawing:

Fig. 1 is a Central sectional elevation of that portion of a mining drill embodying my invention.

Fig. 2 is a detail of a portion of the control device.

Fig. 3 is a detail of the clutch for holding the thread bar nut against rotation.

Fig. 4 is an end View of the sleeve which rotates the thread bar.

The same numerais of reference are used to indicate identical parts in the various figures.

As showing one form of device embodying my invention, though without limiting myself to the details of construction shown and to be herein described, but availing myself of all changes and modifications which may be made within the Scope of the appended claim, reference is made to the accompanying drawing and to Fig. 1 of the drawing of the application above.

By referring to Fig. 1 of the drawing of application Serial No. 281 ,O49, it will be seen that the complete drill comprises a post on which a slide is mounted, the slide comprising in part a turn table upon which the drilling mechanism itself is mounted and for convenience, in the present application, I will number the parts thereof to correspond with similar parts shown in the above mentioned 50 application.

The drilling mechanism itself comprises a main frame 4, Only a portion of which is, shown in the present application, the electric motor 5 being represented in the present case by its forward or driving end The gear housing is shown at 7 and through this as well as the main frame 4, the thread bar 8 extends; the latter Carrying any suitable drill upon its end toward the left of Fig. 1 of the present drawing.

The armature shaft of the motor carries a gear, not shown, which, through an intermediate reduction gear, (not shown), drives the gear 9 carried on the shaftlO, the latter Carrying the main driving pinion 11. The shaft 10 is splined as at 12 and carries the dental clutch 13 'which is adapted to engage the corresponding clutch j aws on the face of the gear 14 which is carried by the clutch drum 15, the latter being mounted free to turnon the quill 16. The shaft 10 is preferably mounted on anti-friction bea rings17 and18 and is provided with a washer 19 lying against the ends of the splines 12 and overlapping the hub of the drum 15 to prevent endwise movement thereof on the quill 16.

The pinion 11 meshes with and drives -a gear 20 fixed upon the driving sleeve 21, the latter bein interiorly provided with a pair of feather Teys 22 which engage corresponding key-ways longitudinally formed in the thread bar 8 so that as the sleeve 21 is rotated, the thread bar 8 is correspondingly rotated, though it is free to slide longitudinally through the 'sleeve in either direction. p

The sleeve 21 is mounted in anti-frict-ion bearing28, within the housing 7 andbearing 24 carried in bearing carrier 25, the thrust, bearing 26 being provided to reduce the friction during the time the drill is being fed to its work.

The bearing Carrier 25 also carres a quill 27 which forms a pilot bearing for the pinion 28 which meshes with the gear 14, and is carriedby sleeve 29, the latter having its bearing in the housing 7 and projecting through the latter and Carrying the nut 30 which engages the threads of the thread bar 8.

A two direction thrust bearing 31 :is provided for the nut 30, thrust'in the -feeding 100 direction being taken by the collar of the nut 30 in contact With the thrust bearing 31 on one side, While the other side of this bearing rests against the housing 7 thrust in the opposite direction being taken through the bushing 32 Which bears at one end against a collar on the sleeve 29, its other end coming in contact With the bea-ring 31, the other side of Which rests against the shoulder 33 in the nose piece 34 carried by the housing 7.

A clutch band 35 is mounted Within the drum and is held central therein, When released, by ribs 36 Which come in contact With a portion of the mounting for the bearing 18. The band 35 is brought into contact With the drum 15 by the eXpander 37, the latter being provided With mutilated gear 38 Which is engaged by a corresponding mutilated gear 39 carried by the Operating shaft 40, the latter being provided With any suitable hand lever 41 vvhereby the shaft may be rocked as required.

The mutilated gear 39 is partly formed as a cam 42 (see Fig. 2) and a shifter rod 43 bears against this cam, being held in contact thereWith by the compression spring 44 Which is provided With a screvv plug 45 to form' an abutment. The shifter rod 43 carries a fork 46 Which engages the dental clutch 13, and by means of Which the latter is moved when the shifter rod 43 is moved. i

The operation of the device is as follows, assuming that the shaft 10 is being constantly rotated and that it is desired to' feed the thread bar to the left Which is the direction of its motion during the drilling operation. By moving the handle of the lever 41 to the left,the mutilated gears 38 and 39 are brought into engagement to rotate the expander 37 and so engage the band 35 With the drum 15 and hold the gear 14 against rotation. This of course stops any rotation of the sleeve 29 and the nut 30 and the thread of the thread bar, While the latter rotates Within the nut 30, advances the thread' bar to the left.

When it is desired to stop the feed of the thread bar, the lever 41 is moved to the neutral position, releasing the band35 and per- 56 mitting the drum 15, and its gear 14 to be rotated by the gear 28 as the thread bar 8 rotates the nut 30, under Which conditions the nut 30 and the thread bar turn in the same direction at the same rate.

When it is desired to feed the thread bar to the right, the handle of the lever 41 is moved to the right thereby moving the cam 42 from under the end of the shifter rod 43 and permitting the spring 44 to cause the engagement of the dental clutch 13 With the jaWs on the gear 14 and so drive this gear in the same direction and at the same speed as the shaft 10.' It is to be observed that the gear 14 is of, considerably larger diameter than the driving pinion 11 so that its surface speed is greater than that of the pinion 11 bar 8, the result being that the nut 30 Over runs the threads of the thread bar and moves it to the right.

The result of this arrangement is that the .drill itself s WithdraWn from the hole being drilled While it is rotating in the same direction as it rotated during the drilling operation thereby clearing out the chips from the hole end leaving the latter in condition to receive the charge of blasting poWder or other material Which the hole Was drilled to receive.

The nut 30 may be a simple device such as shown or it may be composed of a .two-part holder Carrying' interiorly threaded liners such as are ordinarily used on mining drills and are known to the trade.

Having thus fully described my invention, I claim: 4

In a mining drill, the combination of a housing, a threaded tool operatively arranged in said housing for longitudinal movement in one direction through the housing and for reractible movement in the opposite direction through said housing, a driving means,

a train of gearing including clutch means adapted to be actuated by said driving means for imparting rotative and reciprocal movement to said tool, a controllable means for such Clutch means, said controllable means including a manually movable member, movable into selective positions Whereby the clutch maybe alternatively actuated to impart reciprocal movement to said tool When such member is in one position, in another position to'retain the tool neutral and rotative and in another position to impart to the tool reciprocal movement in the opposite direction.

LOUIS J. FELLAY.

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