US2508402A

US2508402A - Portable drill press

Info

Publication number: US2508402A
Application number: US708218A
Authority: US
Inventors: Anton P Kjerulff
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-11-07
Filing date: 1946-11-07
Publication date: 1950-05-23
Anticipated expiration: 1967-05-23

Description

y 1950 A. P. KJERULFF 2,508,402

PORTABLE DRILL PRESS Filed Nov. 7, 1946 IN VEN TOR.

Patented May 23, 1950 UNITED STATES PATENT OFFICE 2,508,402 PORTABLE DRILL PRESS;

Anton P. Kjrulff, Lake Charles, Ila); Application November 7, 1946, Serial No. 708,218

2' Claims.

I have devised an improved tool for hand use in drilling and pressing operations which, being portable, is especially useful to mechanics, such as members of the plumbers trade, and others who frequently find it necessary to perform work, such as repairs of various kinds, at points distant from their work shop where access may be had to heavy stationary power driven machines.

My invention has for its object to provide a drilling press in which the parts are compact, yet of a size to hold work pieces such as water faucet stems and the like, comprising a frame having upper and lower spaced arms, the former carrying the tool holder and its feed screw while the latter serves as the support or bed to which the work piece is clamped.

In conjunction with a tool of the above de-- scribed characteristics my invention also comprehends a novel construction of the work piece bed and holder therefor, together with an improved mounting for the parts by which the rotatable tool is adjustable and fed with relation to the work piece.

To these and other endsv my invention comprehends further improvements and arrangements of parts all as will be fully described in the accompanying specification, the novel features thereof being set forth in the appended claims.

In the drawings: 7

Figure 1 is a side elevation of a, portable'drill press embodying my invention.

Figure 2 is a front elevation thereof.

Figure 3 is a top plan view.

Figure 4 is a bottom plan view.

Figure 5 is a bottom plan view of the tool chuck.

Figure 6 is a detail of the tool rotating handle and the adjacent end of the feed screw therefor illustrating the manner of locking said parts together for performing certain operations.

Figure 7 is a side elevation showing a modified form of work clamp, and,

Figure 8 is a top plan view of the clamping plate shown in Fig. '7.

Similar reference characters in the several figures indicate similar parts.

My description of a portable tool embodying my invention begins with the frame piece, indicated generally by I, which is U-shape to provide parallel upper and lower arms =2 and 3 which are rectangular in cross section and are stiffened against springing under pressure by a reinforcing rib 4, which is disposed centrally lo formed is a clamping screw 6 by means of which they may be drawn together, said screw being provided with an operating handle in the form of a cross bar I.

The tool carrier mounted on the frame arm 5 2 comprises in part a sleeve 8 which fits the opening 5 in said arm and being clamped therein may be adjusted relatively to the arm 3 of the framepiece. The upper half of sleeve 8 is threaded to receive a tool feeding member 9, the upper end of which projects beyond the sleeve and is provided with a head or annular enlargement I0 having a knurled edge for convenience in rotating the member 9 to advance or retract it in the sleeve 8. Member 9 is tubular and journaled therein is the drill shaft or Spindle ll having a handle l2 for rotating it, which is secured to the shaft by a cross pin 13. The shaft i prevented from longitudinal movement in the feed member by providing it with a collar l4 bearing against a friction reducing washer l5, which in turn bears against the lower end of member 9 and the placement of a similar washer l6 between the handle I2 and the top of said member. The extended lower end ofthe drill shaft is threaded as indicated at H, and carries a tool chuck, the sleeve 18 of which fits within and is guided by the lower end of the sleeve 8'. This chuck may be of the well known construction, comprising three jaws for gripping a tool, such 4 0 as a drill, indicatedby l9; upon which the jaws close by rotation of a nut 20.

From the above described assembly of parts it will be seen that the point of a tool secured in the chuck may be brought into engagement with a work piece supported on the arms 3 in the first instance by the vertical adjustment of sleeve 8 and subsequently advanced or retracted by rotation of the feed member, the cutting or drilling action of the tool resulting from its rotation by the handle II.

In instances where parts of a work-piece are to be separated by pressure, a steel pin is secured in the chuck and forward movement is applied thereto by the rotation of the feed screw. In-

around the rear side of the frame. The latter I asmuch as more power may be required than it is possible to apply by a persons fingers to the knurled head I0, I provide a simple means for looking it to the handle l2, whereby said parts may be operated conjointly as a unit. To this end the handle l2 and the head I are each provided with apertures 25, as shown in Fig. '1, which may be brought into register to receive locking pins 26, as shown in Fig. 6.

V The arm 3 of the frame comprises the work bed or holder and for purposes of general serviceability I' adapt it to receive a variety of work clamps for holding work pieces lying thereon or which on account of their shape may re quire them to extend through the bed. To these" ends I also bifurcate the arm 3 by providingit with a slot 21 and enlarge this opening at its outer end, as indicated at 28; to about the di ameter of the chuck sleeve l8. v I

In Fig. 4 I have shown a generally useful form of work clamp adapted to hold valve or faucet stems. It comprises two

arms

29, 30 having overlapping rear ends connected by a rule joint, the latter being formed by perforating said ends and inserting therein a'tubular bushing 3| (see Fig; .1), the extremities of. which are expanded to permanently unite the arms. .This bushing carries a bolt: 32i having a square head 33 which fits the undercut guide 34 of slot 21. A wing nut 35 on the bolt serves to tighten it and hold the clamp in the desired position of adjustment on the work bed. The outer ends of the jaws 29, 3B, carry a clampihgbolt 35 and between the latter and the rule joint I providetheinner faces of said arms with two jawportions of different diameters as indicated by 36, 31, the edges of which are serrated, as shown in Fig. 4.

When it is desired to operate: on a work-piece which requires holding it in a; horizontal posi--' tion, a clamping plate 40: such. as shown in Fig. 7,2 is employed, This'is a flat plate bent down at its rear end 4t and perforated to receive a clamp-' ing" bolt 42. The forward end of the plate is provided with a slot .43, to accommodate the tool carriediin the chuck l8, and uponits lower face, adjacent the inner end of the slot, there is provided a V shaped notch 44, which facilitates the clamping of a cylind'rical Work piece, such as indicated by 45 in Figi'i'.

It will be seen from the foregoing description and theacc'ompanying illustrations that I have provided a tool. for emergency operations, such as: repairing valves; and work of a like: nature which may he -performed by a mechanic; at, the site of the work. Its: general shape andthe come 7 pactness of the parts rendersit as an acceptable adiunct: to a mechanicswork ,I-claim:

1'. A portable hand-operated drill press comprising, a frame or a size to be conveniently grasped in a workmans hand, having upper and kit.

lower parallel arms, the upper arm being bifurcated and having an aperture for a tool operat- 7 ing mechanism and provided with a clamping screw for drawing said arms together, the lower arm having an upper face forming a bed for a working piece holder and slotted for the accommodation of a securing bolt for such holder, said slot being widened at the outer end of the arm in alinement with the aperture in the upper arm, said holder comp'risin'g a pair of arcuate jaws having overlapping rear ends'connected by .a rule joint, a clamping bolt connecting the forward ends of said jaws for holding a working piece in vertical position, a sleeve adjustably secured in said aperture of the upper arm, a tubular feed screw in the sleeve and a tool spindle journaled in the sleeve.

2 A. portable hand-operated drill press comprising a frame of a size to be conveniently grasped in a workmans hand while manipulating the drill press mechanism carried thereon by his other hand, said frame having upper and lower bifurcated arms, the upper arm having an aperture for a tool operating mechanism and provided with a clamping screw for ad justably receiving such mechanism'in said aperture, the lower arm having an enlarged opening at its outer extremity centrally alined with the afore said aperture and provided with a slot extending rearwardly therefrom, a work-piece clamp mounted on the upper face'of the lower arm,- said clamp comprising'a pair of jaw members having overlapping ends pivotally connected by a rule joint, said jaws beingfformed with arcuate inner gripping, edges, aclamping bolt connecting the forward ends of said. jawsand a bolt fitting the slot and cooperating with said clamp to permit its being adjustably secured relative to the enlargement of the arm, a sleeve adjustably secured in the aperture" of the upper arm, a tubular feed screw threaded in the sleeve having anadjusting head located above the screw, a tool spindle journaled in the screw and a crosswise handle secured?- to the outer end" of the spindle 45 beyondv said screw head.-

Aivron r. KJERULFF';

REFERENCES GIT-EU UNITED STATES PATENTS Number Name Date ,v

544,402 Crane Aug. 13, 1895 626,474 Ames June-6, 1899 766,713 Loetzer" Aug. 2,1904 1,155,891 Connor Oct. 5, 1915 1,328,111 Asche Jan. 13; 1920