US828945A

US828945A - Portable electric drilling-machine.

Info

Publication number: US828945A
Application number: US29578706A
Authority: US
Inventors: John Maclean
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-01-12
Filing date: 1906-01-12
Publication date: 1906-08-21
Anticipated expiration: 1923-08-21

Description

PATENTED AUG[ 21, 1906.

J. MAGLEAN. PORTABLE ELECTRIC DRILLING MACHINE.

APPLICATION FILED JAN.12.1906.

5 SHEETS-SHEET 1.

-PATENTED AUG. 21, 1906.

J. MAGLEAN. PORTABLE ELECTRIC DRILLING MACHINE.

APPLICATION FILED JAN.12. 1906.

5 SHEETS-SHEET 2.

N0. 828,945. PATENTED AUG. 21. 1906.

J. MAOLEAN. PORTABLE ELECTRIC DRILLING MACHINE APPLICATION FILED JAILIZ. 1906.

5 SHEETS-SHEET 8.

PATENTED AUG. 21, 1 906. J. MACLEAN. PORTABLE ELECTRIC DRILLING MACHINE.

APPLICATION FILED JAN.12.1906.

5 SHEETS-SHEET 4.

APPLICATION FILED JAN. 12. 1906.-

6 SHEETS-SHEET 5,

; Fig. 8 is UNITED snares PATENT $pecification of Letters Patent.

Patented Aug. 21, 1906.

Application filed January 12,1906. Serial No. 295,787.

To all whom it may concern.-

Be it known that 1, JOHN MACLEA consulting engineer, a subject of the King of Great Britain, residing at 50 Wellwood road, Goodmayes, Ilford, Essex, England, have invented certain new and useful Improvements in Portable Electric Drilling Machines, of which the following is a specification.

This invention relates to portable electric drilling-machines and it has for its object to provide a powerful electric drill which shall yet be of a comparatively light Weight.

p In order that the invention may be clearly understood, I have hereunto appended five explanatory sheets of drawings, whereon- Fi ure 1 is a part elevation and a part longitudinal section of the drill. Fig. 2 is a plan thereof. Fig. 3 is a cross-section on the line X K, Fig. 1. Fig. 4 is a section on the line Y Y. Fig. 5 is a longitudinal section of the armature. Fig. 6 is a view of one end, and Fig. 7 a View of the other end, of the armature. a view of the drill end of machine. Fig. 9 is a view of the feedv end of machine. Fig. 10 is an end view of the hand-feed. Figs. 11, 12, and 13 are views of brush-gear.

On the drawings the same reference characters wherever repeated indicate the same parts.

In this machine the motor is of special construction, whereby great power with little weight is obtained. The armature of the motor, which is external to the field-magnets round which it revolves, consists, as shown at Figs. 5, 6, and 7, of a thin hollow cylinder, preferably made up of stampings slotted on their inner periphery to receive the armaturecoils. These stampings, which are marked a, are held in place by two end rings 1) c, of aluminium, bolted together by bolts d. The end ring I) is united to an end-plate ring e by four or other suitable number of arms f, so that the distance between the rings is suflicient to accommodate the ends of the armature-coils. This end-plate ring is fitted to an end late g, of aluminium, which contains the ba l-bearing it of that end of the armature. The cup ha of this ball-bearing is extended and provided with teeth constituting asteel pinion i, by means of which the motor is geared, as hereinafter explained. The other end rin c of the armature is connected similarly h arms 7' to a ring-7c, which accommodates the commutator Z, which is of the ordinary type. This commutator is of a construction which on a pin 19, in

allows of great lightness and strength and ease with which the armature connections can be made. It consists, preferably, ofa number of hard-drawn copper bars or blocks m, arranged in a ring and suitably insulated by mica or other insulating material from one another and from the end rings, m m. These end rings bind the whole of the bars and are secured together by the screw-pins n, the outer periphery of the commutator forming the brush-surface. The bars are dovetailed at bothends, and the end rings being machined to suit this section thereby hold the bars rigidly in place.

The armature end ring 76, into which the commutator fits and is secured, is united to a central ball-bearing boss p by arms p. The field-magnet stampings g are built up central fixed shaft 1, on which are fixed the several ball-bearing cones and brackets which are required in the complete machine.

The motor is preferably geared in two stages which are or may be identical in their arrangement. The armature end-plate pinion c', before mentioned, gears with a rawhide pinion 8, carried on a pin 8 in a coned. bracket 15, fixed to the central shaft. This rawhide pinion 8 further gears with an internallytoothed ring it, carried on an end plate e, which runs on. ball-bearings w on the aforesaid coned'bracket, the whole forming a neat, compact, and light reduction-gear. The end plate 0, containing the internal toothed ring a, is fitted to a skeleton cylinder or frame as, (of which the ring a may form a part) which just "11s clear around the motorarmature and ias a ball-bearing end plate a at the end remote from the gear. For small'drillingmachines thisreduction-gear set is sufiicient; but

for machines as generally used aisecond gear set is provided. In this case the end plate 2) has the cup 1; of its ball-bearing so formed as ona.

to serve as a steel pinion o similarly to the armature ball-cup before described, and this pinion gears with aiawhide pinion i, carried a coned bracket t, fixed to the shaft 1'. The pins 8 and i carrying the pinions 8. and 'i, are screwed into their respective brackets in such a manner that the rotation of the pinions tends to tighten the pinsin the brackets and not slacken them. The pinion i gears with an internally-toothed ring a, secured to an end plate v screwed on the shoi t cuppedspindle y, into which the drill (not shown) may be fitted. The end plate 0 is secured i a cylinder :0 which incloscs the l1,12,and13.

cured to it an eccentric e, on the side of which works the roller 0 fitted to 5 the levere This lever is keyed or otherwise secured to a shaft of, givingan oscillating motion thereto;

This oscillating motion is transmitted by an pawl e, which gears in aratchet wheel e,- secured to the nut F. As this nut has only circular movement, therotation. given to it by the ratchet feeds the drill for-ward by means of the screw E,

To enable the drill to be fed-forward by hand, a handle-H, which is made one with a collar it, fitted to the boss of frame end plate B, is also provided with a pawl '11,- which ears in the teeth of the ratchet-Wheel, sepurded to the nut F, and thus gives a hand The framework of the machine consists of two aluminium end plates A B,- united' by three steel rods or tubes C, C, and C The end late B of the framework carries the switc D, which controlsthe-electric current. The shaft r of the central field-magnet is fitted rigidly in this end plate. The end plate A of the framework has a'central hardened-steel collar G, fitting over the spindle 4 .which rotates within it. This collar forms a bearin The bruslngear G is clearly shown in Fl s.

It consists of a rocker, of suitable light material, having two arms land 2 at right angles. Secured to and insulated from these arms are the brush-holders 3 and 4c. The brushes 5 are of carbon andare rectangular in shape, being held on the commutator by the levers 6, the pressure being regulated by the springs 7. The rocker is fixed in any desired position to the shaft r by the pin'8.

The corner drilling arrangement is shown in Figs. 1 and 2. It will be seen that the end plate A is extended to a boss A, into which are fitted two rods or tubes C- O which run parallel with and are just clear of the ma chine and unite the one side of the two end plates A B. The other side of the end plates are united by the single rod or tube C, which as will be seen, is so formed as to serve as a handle by means of which the machine may be carried and held. The spindle or socket y in this case has a pinion y, which gears with an intermediate pinion y, which latter drives a pinion y on a spindle or shaft y, running in ball-bearings in the boss A, said shaft y having connected therewith many suitable manner a socket 11 Motion is transmitted from the spindle or socket y to the drill by the gear y y y. In this case the feed may e arranged as shown- 5. e., in line rotating assets with the drill-by transferring the whole of the feedcar from the center to the side borin spindle.

I he construction of the drill can of course be altered or varied in its details of construction according to the work it is to perform.

Having now fully described my invention,

*what I'claim, and desire to secure by Letters Patent, is

1. A portable electric drill comprising, in

frame; a magneton the shaft, an armature arranged externally of the ma et, a commu-tat-or and an inclosing cylin er or frame- Work, said cylinder or framework being driven by gear from the armature and be ing adapted to rotate the'drill.

2. A portable electric drill comprising, in combination, a frame, a fixed shaft in the frame, a switch, feeding mechanism, a magnet on the shaft, an armature arranged externally of the magnet, a commutator, "a skeleton frame driven by gearing from the armature, an inclosing cylinder or framework driven from the skeleton. frame aforesaid, said inclosing cylinder or framework having a socket in which the drill is fitted, the several working parts running in ball-bearings.

3. A portable electric drill comprising, in combination, a frame, a fixed shaft in the frame, a magnet on the shaft, an armature arranged externally of the magnet, a commutator, an inclosing cylinder or framework, gear for driving the cylinder from the armaturc, means connected with the cylinder for the drill, means for feeding the drill forwar automatically and also forfeeding it by hand.

4. A portable electric-drill comprising, in combination, a frame, a fixed shaft in the frame, a switch, feeding mechanism, a magnet on the shaft, an armature arranged onternally of'the magnet, a commutator, a

skeleton frame running upon ball-bearings on the shaft, internal teeth on this frame, a gear-wheel gearing with the teeth and with a pinion carried on a sleeve running in ballhearings on the shaft, said sleeve being connected to the armature, and means connected with the skeleton frame for rotating the drill.

5. A portable electric drill comprising, in combination, a frame, a fixed shaft in the 1 frame, a switch, feeding mechanism, a magnet on the shaft, an armature arranged externally of the magnet, a commutator, a skeleton frame having internal teeth thereon, a gear-wheel gearing with said teeth on the one hand and with a pinion connected with the armature on the other hand, a bracket for supportin the gear-wheel an inclosin cylinder fitte on the shaft at one end and connected with a socket adapted to receive the drill at the other end, internal teeth on the inclosing cylinder, a gear-wheel, a inion running in bal bearings and connects with combination, a frame, a fixed shaft in the other lever e atwhose opposite end-is fitteda 1 a skeleton frame, and a bracket for support-- ing the gear-Wheel.

6. A portable electric drill comprising, in combination, a frame, a fixed shaftin the frame, a magnet on the shaft, an armature arranged externally of the mutator, an inclosing' cylinder, gear connected with the armature for rotating the cylinder, a socket connected with the cylinder,'a bracket on the frame, ashort shaft with a second socket therein carriedby the bracket, teeth on this socket, external teeth on the socket of the inclosin cylinder and an intermediate. inion adapte to engage with said teeth an with the teeth of the second socket.

7. A portable electric drill comprising, in combination, a frame, a fixed shaft in the frame, a magnet on the shaft, an armature magnet, a com arranged externally of the magnet, a commutator, an inclosing cy der driven b gear from the armature, a socket connecte with the cylinder, on the frame, end thereof carriedby the bracket, teeth on both sockets, an intermediate pinion, a screw for feeding the drill, ratchet mechanism for operatin the screw, a second bracket with screw-ho e therein which is in linewith the second socket and which is adapted to receive afeed-screw. T

Intestimony whereof I afiix my signature in presence of two Witnesses.

JOHN

Witnesses:

' J. SHAND SIVEWEIGHT,

-WILLIAM W. S1vE wE1eHT teeth on the socket, a bracket a shaft having a socket at one:

as I

MACLEAN.