US2870994A - Drilling machine - Google Patents

Description

Jan. 27, 1959 K. J. KLAPKA DRILLING MACHINE 3 Sheets-Sheet 1 Filed Aug. 6, 1956 JILL! LlLJ LU.

Mu d. MAP/r4 Jan. 27, 1959 K. J. KLAPKA 2,870,994

DRILLING MACHINE Filed Aug. 6, 1956 3 Sheets-Sheet 2 .EZEZZiLZZI" l A/PL J, MAP/m Jan. 27, 1959 K. J. KLAPKA I 2,870,994

DRILLING MACHINE 3 Sheets-Sheet 5 Filed Aug. 6, 1956 ldilllnalllilllll E E z. 5

United States Patent I 2,870,994 DRILLING MACHINE Karl J. Klapka, Detroit, Mich., assignor to Wheel Trueing Tool Company, Detroit, Mich., a corporation of Delaware Application August 6, 1956, Serial No. 602,134

3 Claims. (Cl. 255-53) This invention relates to a portable drilling machine that is adapted for operation at any desired drilling angle, and which is provided with an adjustable base and support column to accommodate operation in a diversified number of locations having varying surface condi tions. I

I Specifically, this invention relates to a portable drilling machine having a drilling head swivel mounted on a telescoping support column, which may be extended or retracted as necessary to establish a rigid contact with adjacent walls, and which is also provided with an adjustable base to compensate for irregularities of the supporting surface.

An object then of the present invention is to provide an improved portable drilling machine having a fully swivelling drill head so as to be adaptable for operation at any desired drilling angle. I

Another object of the present invention is to provide a portable drilling machine with a base having a series of vertically adjustable leveling screws to permit a compensating adjustment for small variations in the surface on which the drilling machine is operated. I

Still another object of the present invention is to provide a portable drilling machine with an adjustable drill head support column, which may be rapidly extended or retracted to engage the ceiling and floor or opposite Walls of the drilling location, to thereby provide a more rigid support for the machine during the drilling operation.

A further object of the present invention is to provide a drilling machine which is adapted for operation in relatively inaccessible locations. I I

Many other objects and advantages of the present invention will become manifest to those versed in the art upon making reference to the drawings and the detailed description which follows:

On the drawings: I

Figure 1 is a fragmentary side elevational view of the present invention, with some parts broken away for clarity;

Figure 2 is a front elevational view, of the present invention with some parts broken away for clarity;

Figure 3 is an enlarged cross-sectional view, with some parts omitted for clarity, taken substantially along the line III-III of Figure 1; I

Figure 4 is an enlarged cross-sectional view of the mounting collar and pivoted drill head assembly of the present invention, with some parts omittedfor clarity, taken generally along the line IVIV of Figure 2; and

Figure 5 is a fragmentary top cross-sectional view of the adjustable collar, pivoted mounting plate, and rack and pinion gear assembly, of the present invention, taken substantially along the line V-V of Figure l.

As shown on the drawings:

of the present invention is comprised generally of an adjustable base B, a telescoping support column assembly P, a slidable motor support collar assembly A, a swivelis to be dismantled.

2,870,994 Patented Jan. 27, 1959 ling motor carriage assembly C and an electric motor assembly M.

The base B, is comprised generally of a channelled flat plate member 11 having downwardly extending flanged side portions 12. A pair of wheels or rollers 13 are mounted at one end of the base B, and a pair of feet 14 are similarly mounted at the opposite end of the base.

As shown in Figures 1 and 2, the base B is provided with aplurality of leveling screws 16 which are positioned substantially adjacent the rollers 13 and feet 14 and extend through the base B to engage the supporting surface. The leveling screws 16 are provided with an operating handle 17 and lock nut 18, and are individually adjustable to maintain the base B in a level plane, regardless of the degree of inclination or irregularities on the surface on which the machine is to be operated.

It should be noted that additional weights may be added to the base B to compensate for the increased weight of heavier drill motors, as will be explained more fully later.

The support column assembly P is detachably mounted on the base B, in a column support collar member 19, which is provided with screws 20 to rigidly clamp the column assembly P in a vertical position, or permit adjustable movement of the column about its longitudinal axis to any desired position.

Thus, the support column assembly P, motor carriage assembly 0 and electric motor assembly M, may be readily demounted from the base B, by loosening the screws 20 and sliding the retained end of the post assembly P out of the column support collar member 19.

As best shown in Figures 1 and 4, the support column assembly P is comprised generally ofan outer tubular shaft member 21 and an inner tubular shaft member 22. The inner tubular shaft member 22 may be slidably ele vated or lowered within the tubular member 21 to any desired height, ranging from the telescoped height of the two shaft members to the extended height of the two members, when the inner shaft member 22 is at its fully raised position.

The inner tubular shaft member 22 is provided with a plurality of circumferential grooves or undercuts 23 at intermittent points along its outer periphery, which receive a lock ring or collar 24 (Figure 1), to thereby provide a rapid rough height adjustment for the telescoping support column assembly P. I I

I The fine height adjustment of the support column assembly P, is obtained by a screw 26, which is threaded into the end of the inner tubular shaft member 22. The screw 26 is connected to a swivel plate 27, and means are provided to extend or retract the screw 26 and plate 27 from the tubular shaft 22, as for example by diametrically boring the screw shaft 26 and inserting a suitablelever or handle 25.

The plate 27 is of sufficient size and surface area to distribute the thrust load of the extended post assembly P and thus prevent indentation or damage to the supporting surface.

A small base plate (not shown), similar to the base, plate 27, maybe substituted for the base B, in some operations Where space conditions are limited.

Thus it will be appreciated that the telescoping support column assembly P may be rapidly adjusted to any desired height by loosening the locking collar 24, extending the inner tubular shaft member 22 to, the approximate height of the overhead surface, inserting the ring 24 in the most 1 proximate groove 23, and then making the final adjust- As best shown in Figures 1 and 2, the drilling machine ment to the supporting surface by manipulating the fine adjustment screw 26. The reverse procedure is followed when the drilling operation is completed, or the machine As best shown in Figure 5, the slidable collar assembly A is comprised of a sleeve member 28, which is formed with a split portion 29, integral transverse pivot retaining flange portions 31 and 32, respectively, and diametrical carriage locking flanges 33 and 34, respectively.

Suitable fasteners 36 are provided across the split portion'29 of-the sleeve member 28, to lock the collar assembly A at any desired position along the telescoping support column assembly P, when the sleeve 28 tightens on the post P.

The sleeve member 28 is centrally diametrically bored as at 37 (Figure to form a journal surface 38 for a stub shaft projection 39 of a pivot plate 40.

As shown in Figures 3, 4 and 5, the pivot plate 40 is of a generally disc-shaped configuration having a circumferential beveled edge 41 tapering generally toward the motor carriage assembly C. The stub shaft 39 projects axially out of an inner face 42 on the plate 40, and a generally rectangular boss 43 projects axially out of an outer face 44 on the plate 48, the stub shaft 39 and boss 43 being in substantially coaxial alignment.

The rectangular boss 43 is transversely bored and threaded as at 46 (Figs. 3 and 4) to receive a plurality of suitable fasteners 47.

A generally square face plate 48 receives a tapered bore 49, which is substantially complementary to the annular tapered edge 41 on the pivot plate 40, such that when the pivot plate 40 is positioned in adjacent assembled relationship with the face plate 48, the respective plates will substantially lie in the same plane.

As better shown in Figures 3 and 5, the face plate 48 is symmetrically bored and threaded as at 50 (Figure 3), to receive a plurality of locking fasteners 51 (Figure 5) which project through the flanged portions 31 and 32 to axially engage the respective plates 40 and 48 along their beveled contacting surfaces, 41 and 49, respectively.

The respective locking flange portions 31 and 32 are bored as at 52 and 53 respectively, to receive the shaft portions of the fasteners 51.

It will thus be appreciated that the amount of frictional contact between the pivot plate 40 and face plate 48 along the tapering engaging surfaces 41 and 49, and the conse quent degree of pivotal freedom of the pivot plate 40, may be varied by loosening or tightening the fasteners 51.

When the face plate 48 is in a relatively loose frictional contact with the pivot plate 40, the pivot plate 40 may be rotated to any desired angular position, relative to the face plate 48 and sleeve member 28, and rigidly retained in this position by tightening the fasteners 51 to cause a locking frictional contact between the respective tapered faces 41 and 49.

The pivot plate 40 may thus be rotated through a full 360 arc and locked in any desired position along the arc, depending upon the particular drilling angle.

Referring now more particularly to Figures 4 and 5, the swivelling motor carriage assembly C is comprised generally of a U-shaped channel member 54, having a base portion 56 and side portions 57 and 58, respectively. The internal faces of the side portions 57 and 58 are longitudinally recessed as at 59 and 60 to slidably receive a similar pair of side portions 61 and 62 respectively of a channelled guide member 63. A rack 64 is centrally positioned between the sides 61 and 62 of the channel member 63, and is secured to the guide member 63 by a plurality of spaced fasteners 65.

As best shown in Figure 4, the channelled guide mem ber 63 and rack 64 are rigidly secured to the pivot plate 40 by the fasteners 47, thus preventing any relative rotation between the guide member 63 and pivot plate 40. A pair of lock bolts 30 are provided in carriage C, to adjust the sliding friction of the carriage on the channel member 63.

The side faces 57 and 58 of the channel member 54 are transversely bored as at 66 to receive and journal a spindle cured to the spindle shaft 67 by a set screw 69 and is positioned in toothed engagement with the rack 64. Suitable spindle retainers 70, as for example a washer and snap ring, are provided on the spindle shaft 67, adjacent the outer side faces 57 and 58 of "the channel member 54 to axially position the spindle 67 in the channel member 54.

An operating handle 71 is provided at one end of the spindle shaft 67, to permit the application of torque to the spindle shaft 67 and spur gear'68, and thereby raise or lower the carriage assembly 54 along the channelled guide member 63, as desired.

Suitable end stops 72 are provided at the extremities of the guide member 63, to prevent the carriage assembly C from being completely moved off of the guide member 63 and out of engagement with the rack 64. i

Thus it will be appreciated that the slidable collar assembly A and rack 64 on the guide member 63, permit a wide latitude of adjustment of the motor carriage assembly C, by a selective adjustment of each of these particular components.

It will also be appreciated that, as the rack 63 will pivot with the motor carriage assembly C when the locking fasteners Slate loosened, the motor assembly M may be advanced or returned along the guide member 63, regardless of the angular position of the electric motor assembly M and motor carriage assembly C.

This feature is particularly advantageous in that the electric motor assembly M may be readily raised or lowered into its operating position by loosening the screws 36 and sliding the collar assembly A to the desired position on the support column P. The motor assembly M may then be rotated to the proper drilling angle and then moved along the rack by manipulation of the operating handle 71 to advance the drill through the work.

Referring now more particularly to Figures 1 and 2, the motor assembly M is comprised generally of a standardelectric or air motor 73, of sufficient size and rating for the particular operating requirements to be encountered, and is provided with a mounting bracket 74, which is integrally formed in the casing of the motor 73. Suit able fasteners 76 secure the motor 73 to the outside face portion of the carriage 54, and a pair of keys 77a and 77!) iii a corresponding pair of spaced relationship keyways 75a and 75b, respectively prevent any relative rotation between the motor assembly 73 and carriage assembly C.

A swivel retaining nut :78 is provided to retain a swivelled cooling assembly 79 to the motor 73. A suitable liquid coolant, as for example water, is supplied to the swivelled cooling assembly 79 (from a source not shown) through a hose 80, to thereafter flow through the swivel assembly onto and around a cutting tool T (Figure l). A shutofi valve 81 is provided to regulate the flow of coolant to the swivel assembly as desired.

Electrical energy is supplied to the motor assembly M, through a conduit 82, and a switch 83 is provided to activate the motor 73.

It should be understood that various electric motors having dilferent ratings and outputs may be substituted for the motor 73, shown in Figures 1 and 2, depending upon the contemplated working requirements, and that any desired coolant having particularly advantageous cooling or lubricating properties might be used to cool a particular cutting tool, thereby to increase the cutting efiiciency of the tool and extend its operating life.

While I have illustrated only one specific embodiment of myinvention, it should be understood that many other modifications and variations may be effected without dcparting from the scope of the novel concepts herein disclosed.

I claim as my invention:

l.In a portable drilling machine, a base, a-support column mounted on said base and adapted to be clamped into engagement with a ceiling to retain said base in a stationary position on the floor, a support collar slidably mounted on said column for adjustable movement therealong and having a split portion, fastening means bringing said split portion together and clamping said collar in position on said column, a drill support platehaving a stub shaft projecting therefrom and rotatably mounted on said collar to accommodate adjustable movement of said drill support plate about a horizontal axis, a drill carriage mounted on said plate, a drill carried by said carriage, said support plate having a beveled periphery beveled inwardly toward the outer side thereof, a stationary plate mounted on said collar and extending about said support plate and having a beveled surface engageable with the beveled periphery of said drill support plate, and means clamping said stationary plate to said support collar and increasing the frictional contact between the beveled surface of said support plate and said stationary plate and retaining said support plate and drill carried thereby in a selected position of adjustment about said shaft,

2. In a drilling machine, a base adapted to rest on the floor, a support column mounted on said base adapted to have clamping engagement with the ceiling and hold said base stationary on the floor and supported in fixed relation with respect thereto for drilling, a drill carriage having a drill thereon, means for mounting said drill carriage on said column for adjustable movement therealong and for rotatable adjustment with respect thereto about an axis extending transversely of the axis of said column comprising a support collar mounted on said column for adjustable movement therealong, means for clamping said collar in position on said column, a support plate having a vertically extending face mounted on said column for free rotation with respect thereto about a horizontal axis, a clamping plate retaining said support plate to said collar, means clamping said clamping plate to said collar and exerting frictional resistance to rota extending outwardly from said support plate, a rack extending along said guide track between the flanges thereof, said drill carriage being of a generally channellike form in cross-section and having slidable engagement with the flanges of said guide track and having gibs extending inwardly along the base of said guide track, and means feeding said carriage along said guide track comprising a pinion meshing with said rack and means rotatably mounted on said carriage for rotatably moving said pinion.

3. In a drillingmachine, a stationary support, a sup-J port plate rotatably mounted on said support for rotation about a horizontal axis and having a plane outer face, means retaining said support plate in a selected position of adjustment on said support, a channelled guide track secured to said plane outer. face of said support plate and having parallel flanges extending outwardly of saidsupport plate, a rack mounted on said channelled, guide trackbetween the flanges thereof and extending therealong, a drill carriage guided for movement along said channelled guide track, said drill carriage being of a generally channel-like form in cross-section and having slidable engagement with the outer faces of the flanges of said guide track and having gibs extending inwardly along the inner face of said guide track, a pinion meshing with said rack, a shaft extending across said drill carriage and having said pinion mounted thereon and rotatably mounted in said drill carriage, and means for rotatably moving said shaft and thereby feeding said drill carriage along said guide track. i

References Cited in the file of this patent UNITED STATES PATENTS Germany July 22, 1943

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