US1783290A - Anchor for drilling mechanism - Google Patents

Description

Dec. 2, 1930. G. w. HULSHIZER 1,733,290

ANCHOR FOR DRILLING MECHANISM Filed Feb. 19, 1929 2 Sheets-Sheet 1 IN VEN TOR.

HIS ATToRNB? Dec. 2, 19304 G. w. HULSHIZER 1,733,290

ANCHOR FOR DRILLING MECHANISM Filed Feb. 19, 1929 2 Sheets-Sheet 2 INVENTOR.

aisizg er Hi5 ATTORNEY Patented Dec. 2, 1930 UNITED STATES PATENT OFFICE GEORGE w. HULSI-IIZER, or srEwAa'rsvILLE, nnwannsnmnss enon 'ro INGERSOLL- BAND CQMPANY, or JERSEY CITY, NEW JERSEY, A CORPORATION on NEW JERSEY r ANC HOR FORDRILLING- MECHANISM V Application filed February 19, 19 29. Serial No. 341,193.

of the working implement preparatory to the delivery of the blows of the hammer piston.

The rock drill may be provided with a suitablehandle against which manual pressure may be applied to. resist the tendency of the drill to followthe movement of'the rotation mechanism. Normally, under favorable conditions, a slight pressure may sufiice tohold the drillagainst rotary movement. Under Where soft strata are encountered bythe drill steel, the drill steel advances very-rapidly, so

that instead of forming a drill hole of generally cylindrical shape, t-he wings of the drill bit will rifle the material being drilled,"

When employing drillsequipped withfauto matic rotation mechanism all of the elements through which rotation is transmitted toiand.

7 including the drill steel. are of course interlocked with, each other and, sincethe thrust for rotating these elements reacts against the stationary elements of the drill, it will readily be seen that when the hole becomesrified the entire drilling mechanismtendsto rotatewith I the drill steel.

When this occurs. a heavy thrust is impartedj'to the portion against which the operator applies pressure, such as the handle, and it happens not infrequently that the handle is jarred out of the operators grasp. P The drill is then of coursefree to rotate about its axis and unless the operator has i suiiicient room, to quickly remove himself from the range o'f the'rapidly rotating-banthe will of the operator.

dle, he may sufifer serious injury.

take placein 'the drill hole the drilliiigmech anism will not rotateabolit its axis unless by Another object to enable anchoring meansto be readilyrocked out of thean'cl oring position mm a released positionarid tobe' retained inthe latter position in a simplified manner until conditions in the drill hole are The present invention -,contem'plates'the elimination of chances ofin1uryjto the operator by so anchoring or securing the drilling In the drawings illustrating the invention. and. inwh ch similar reference characters refer to similar parts,

' Figure 1 is a elevation partly in section of a stoper type rock drill having theiiivention applied thereto,

Figure .Z is a sectional enlarged elevation illustrating in deta l the manner in which the other conditions, however, and particularly anchoris secured to the feed rod and showing the anchor in engagement with an abutment, Figure 3 is a view taken through Figure 2 on. the line 33 looking in the direction, in dicated by the arrows,

Figure 4 is a view similar to Figure 2 showing: the anchor in the released position,

againsuch that the anchor may be placed in V Figure 5 is an elevation partly in section I of a modification of the invention, and

Figure, 6 s a transverse View taken trough Figure 5' on the line 6+6 looking in the direction indicated by the arrows.

, Referring to the drawings, A designates generally a rockdrill of the stopertype comprising a percussive element B and a feediiigelement G. The percussive element shown in'outline comprises a cylinder D to p the frontend of which'is secured a front" head E and to the rearward end a headblock F. A drill steel G extends iiitothe front head E wherein it'is guided and interlocked with a chuck H, only a portion of Which is shown protruding from the end of the iront head E.. r

The rock drill illustrated is intended to represent one of the'type in which automatic rotation mechanism is provided ior1i1npart ing rotary movement-to the drill steel G. The

rotation mechanism is not shown, but it is able type capable ofimparting a step step rotary movement to the drill steel preparertory to the delivery ofthe blows ofthe' hammer piston (not shown) I The admission ofpressure fiiiid-to tlie drill to be understood-that it may be of any suited by a lever J adjacent the head block F. Secured to the head block F is a handle K which may be grasped by the operator for manually rotating the drilling mechanism.

The feeding mechanism C comprises the usual cylinder L which may be secured to the head block F by any suitable means, such as bolts 0, which as illustrated, may also clamp the feeding cylinder L and the percussive cylinder D together.

lVithin the feeding cylinder L is disposed a feeding piston P carrying a feed rod Q illustrated in this instance as being of rectangular cross section. The rod Q extends through a rectangular aperture R in a head 55 forming a closure for the lowermost end of the feed cylinder L. In the projecting or lowermost end of the feed rod Q is a pointer T adapted to engage an abutment, such as a mine floor, or as illustrated, a plank U which may be disposed on the mine floor and which the pointer T may penetrate to prevent the drilling mechanism from moving out of the operative position.

From the foregoing it will readily be observed that there cannot be any relative rotation between the feeding element and the easing parts of the percussive element. In other words, even though the resistance to the rotation handle K were removed to permit the drilling mechanism to rotate with the drill steel the feed rod would also rotate with the feeding cylinder.

In accordance with the present invention additional means, other than the handle K,

are provided for insuring against unauthor- 1 ized rotation of the drilling mechanism. To

this end the feed rod Q is provided near its lowermost end with a transverse slot V which opens in this instance in opposite sides of the feed rod, thus leaving walls N and X on opposite sides of the slot V. Apertures Y and Z are formed in the walls W and X respectively for the reception of a pivot pin I) which extends through the slot V and in this instance has a threaded end 0 carrying a nut (Z for drawing the pivot pin Z) firmly into the apertures Y and Z.

The pivot pin 6 in most respects resembles a bolt and has fiat opposed surfaces 6 and f which preferably extend along the entire unthreaded portion of the pivot pin. On one end of the pivot pin 6 are inclined portions 9 to engage correspondingly inclined notches 7L adjacent to and merging into the aperture Y and having flat sides as has also the aperture Y to-engage the flat surfaces 6 and f of the pin Z) for preventing rotation of the pivot pin relatively to the rod Q. inclined with respect to the longitudinal axis of the feed rod Q so that the flat surfaces 0 and f will therefore also assume an inclined The notches h are anchor j in the form of a hook having a pointer 7c adapted to be driven into the plank U. The opposite end of the anchor extends into the slot V and is provided with an aperture 0 for the reception of the pivot pin 7). The aperture 0 is shown as being of cylindrical form and a slot 7) is formed in the anchor j adjacent the aperture 0 into which it opens at one side. Preferably the slot p is only of slightly greater width than the spacing of the flat surfaces 6 and f of the pivot pin 6.

In the form of the anchor j illustrated, said anchor has converging portions 9 and 1", the aperture 0 and the slot p being formed in the portion g. At the outer end of the portion 7 is a downwardly projecting portion or hook s which carries the pointed end 70. The portion 1 is preferably so arranged with respect to the portions Q and s that when the anchor y is in substantially the operative position, said portion 1" will assume a position approaching the horizontal and it is against this portion that hammer blows may be struck for driving the end into the plank U.

In practice, when drilling rock of substantially uniform hardness, the anchor will oc cupy the position shown in Figures 1 and 2, that is, the pointed end 70 will be in engagement with the abutment, such as the plank U. When the anchor is thus positioned the rock drill will be adequately held against any form of rotary movement and it will be unnecessaryfor the operator to hold it against rotation. He may therefore give his entire attention to the controlling devices, such as drills of this type are provided with for controlling the percussive and feeding elements. .When'the, drill steel tends to stick in the drill hole the pressure fluid supply to the percussive element may be cut off and the anchor may be rocked to the position illustrated in Figure 4: and moved endwise so that the slot 7) will engage the flat surfaces (2 and f of the pivot pin. In this way the anchor j will be retained in the released position.

1 "With the anchor 7' in the released position, the operator may then grasp the handle K and after the percussive element is again set in operation may oscillate the entire drilling mechanism by hand, thus assuring a cylindrical hole in the soft material. After the drill steel G again encounters material in which the rotation mechanism will suffice to assure a cylindrical hole,,the anchor may again be driven into the plank U and normal drilling may then be resumed.

In the modificationillustrated in Figures 5 and 6 a pairof members if and u are disposed on opposite sides of the feed rod Q, and. are clamped together by pivot pins I) extend ing through lugs 41 and w on opposite ends of the members 25 and a respectively. The lugs '4; and w are so spaced with respect to each other as to form slots 00 therebetween for the reception of anchors j, two being shown in this modification. Preferably the feed rod Q is slightly reduced as at 3 to form shoulders 2 which will engage the sides of the members t and u to assure the correct posi- 5 tion of said members on the feed rod. The

pivot pin 5 and the anchors j may be in all respects like those shown in the preferred modification so thatwhenever it is desired to rotate the rock drill by hand the. anchors j may be readily moved into and held in the released position by the pivot pins 7).

I claim: 1. In a rock drill, the combination of a percussive element and a feeding element, said feeding element comprising a cylinder and a piston, a polygonal bore in the cylinder, a rod on the piston slidable in the bore and in engagement therewith to prevent rotation of the piston with respect to the cylinder, a slot in the feed rod, a pivot afl'ixed to the feed rod and extending transversely through the feed rod and the slot and having a flat surface, and an anchor rotatable about the pivot and adapted to engagean abutment for pre- 7 venting rotation of the rock drill, said anchor being adapted to interlock with the pivot for holding the anchor in the released position.

2. In a rock drill, the combination of a 30 percussive element and a feeding element, said feeding element comprising a cylinder and a piston, a polygonal bore in the cylinder, a rod on the piston slidable in the bore and in engagement therewith to prevent rotation of the piston with respect to the cylinder, a slot in the feed rod, a fixed pivot extending transversely through the feed rod and the slot and having opposed flat'surfaces, an anchor having an aperture through which the pivot w extends and to enable said anchor to be oscillated about the pivot, said anchor having a pointer for engagement with an abutment for preventing rotation of the rock drill, and a slot merging into the aperture to engage the flat surfaces for retaining the anchor in a released position.- I

In testimony whereof I have signed this specification. V

VGEORGE W. HULSHIZER.

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