US2674098A - Portable power-driven tool for drilling and like operations - Google Patents

Description

J. L. TAYLOR E POWER-DRIVEN TOOL F NG AND LIKE OPERATIO PORTABL DRILLI April 6, 1954 Filed March 12, 1949 2 Sheets-Sheet l m. n k. Ta. 1 or- (A-r-ro mayw April 6, 1954 J. TAYLOR 2,674,098

P ABLE POWER-DRIVEN TOOL FOR LLING AND LIKE OPERATIONS Filed March 12, 1949 2 Sheets-Sheet 2 Patented Apr. 6, 1954 ITZED fS'TlTAT-ES PATENT OFFICE! PORTABLE POWER-DRIVEN TOOL FOR "DRILLING AND LIKE OPERATIONS John L. "Taylor, La Habra Heights, cent, :as-

:signor to IKe'ller Tool Company, Grand Haven, Mioh.,--a:corporation of Michigan Application"March 12, 1949, Serial No. 811050 S CIaims. I1 The' inventionpertains toa pressure fiuid operated tool of the "type in which a rotary spindle is reciprocated toward and "from the work to perform drilling, tapping or allied machining operations, and has more special reference "to small-compact tools of the type adapted for detachabl'e connection'with a jig 'plateor the like associated =withthe work, and also is capable of use in an arrangement wherein a plurality of tools are-stationarily supported in closely spaced relation 'for the'performance of drilling, tapping or like operations on a single workpiece.

I More specifically stated, 'the invention pertains to a' tool of the "type embodying 'a power-driven spindleamotor fordriving thesame and means for feeding the spindle toward the "work and retracting it "therefrom; and "the primary object is toprovide 'a tool of this character in which the driving'motor for the spindle is advantageously arranged with respect to a reciprocatingactuatcr so as 'to'reduce the transverse dimensions of the tool and at the same time permit of easy and convenient control of both the motor and the actuator by'a simple valve device.

'A further object is to provide a tool of the character set forth which is operated by air under pressure both for driving and reciprocating the tooli'spindle.

Another object is to provide a simple valve means for controlling both "the "motor and the feed mechanism.

The objects of "the invention .thus generally stated, together with other -objects and ancillary advantages, are attained'by the construction and arrangement set forth "by way of illustration in the accompanying drawings, wherein:

Figure 1 is a .fragmentaryelevational view of the 'tool with parts :broken away and shown "in section.

Fig. 2 is a fragmentary :se'ction'al view on a somewhat enlarged scale taken transversely in the plane of line 2- 2 of .Fig. 1.

Fig. dis a fragmentary longitudinal'sectional view taken in 'the-planeof line '33'of Fig. 1.

Fig. 4 is a transverse sectionalview taken in J Fig. 6 is a fragmentary horizontal section 5;

taken transversely in the plane of lineB- B of Fig. 4, but showing schematically the valving arrangement 5 for controlling the :supply of pres sure fluid to th'e'drive'motoriand' reed mechanism.

s-Fig; 71s a transverse sectional view taken in 2 "the plane of line 1- ofFig. 3*but' on a 'larger scale.

In general, the improved tool comprisesan "elongated'body herein in the 'form o'f'a cylinder *1 ll having a rotary air 'mo'tor "H guidedfor reciprocation in the "forwardopen-end of the cylinder and having its motor-connected to a tool spindle 12. "Within the cylinder:immediately behind' the motor "and rigidly secured thereto is a pneumatic actuator comprising reciprocating "plunger -1 3 having axially spaced pistons M and F5 on :a piston rod l6. In the present embodiment the pist'ons are disposed 'o'n*opposite sides of'a sta- Itionary abutment l 'l the form of a partition the cylinder centrally ap'ertured for the zpassage of the :piston \rod and coacting withthe 'cylinder and *piston's to define advancing and retracting (herein front and rear) piston chambers l8 and I9. To control the supply andexihaust of air to and from the front and rear qoiston chambers and a-lsoto the motor, a :simple two'position valvev2ll is employed (Fig.4). As shown the valve 1 is mounted on the cylinder 11) substantiallyi'inthe transverse lplaneic'fithe abutment l '1, "the motor being supplied with pressure iiuid during the forward or advancing stroke iof the actuator through the provision of zone or more passages '2 I .in the front piston establishing communication between the .iafor-ward piston chamber and the motor. a

Air under pressure -is advantageously utilized both Tfor actuating the motor 5'! I and the' recipro- 'cating plunger 1 3. Preferably, I employ 'a motor ofthe rotary vane 'type comprising in the instant embodiment :a cylindrical casing or housing '22 enclosing a rotor cylinder 12a with an inlet *port 23 registering' with the passage 22 l in the piston. Within the cylinder 221; isa rotor 24 isuitably connected with the :tool spindle 1-2, the latter being equipped as shown ."with a chuck 25 *for supportingadrillcr the like. I

The rotor cylinder fzahas front and T831 end plates 2'6.and' 2'1, the latter :having the inlet'port 23 therein. Exhaust airffrom the rotor :cylin'der escapes 'from the housing 22 through passages 23a. To secure the motor rigidly to "the actuator plunger, the piston M has a portioniscrew threaded into the :ihOllSii'ig -as fsh'owndn '2.

The abutment 5H :iS he1eiIl shownias formed integral with the cylinder, and the cylinder 10 is milled transverselythereof to provide an ex I secured to the cylinder and "having mounted therein a push rod 32 to which is connected a slide valve 33. The valve block is seated in the groove 30 and has a flat inner fact mating with the bottom of the groove 30, the block being made hollow so as to coact with the valve seat to form a valve chamber 34 with opposed end walls 35 and 3B apertured for the passage of the rod 32 so that the opposite ends of the rod project from the casing for convenient manipulation.

Air under pressure is supplied to the valve chamber 34 through a supply passage 3?, so that when the tool is in operation the chamber is constantly under pressure. Air is delivered alternately to the front and rear piston chambers l8 and 19 according to the position of the valve member 33, the latter being shiftable manually by the push rod into either of two positions shown in broken lines in Fig. 6 and respectively designated VI and V2.

As shown, the valve member is in the form of a recessed disk connected with the push rod by a cross pin 38 and yieldably urged by a spring 39 against the valve seat. In the advance position VI of the valve, it uncovers a forward delivery port 40 connected by a passage 4| to the forward piston chamber. At the same time it connects a rear delivery port 42 to an exhaust port 43, the former leading to the rear piston chamber through a passage 43a, and the latter to the atmosphere through a passage 44. In its "retract" position V2, on the other hand, the valve member uncovers the rear delivery port 42 and connects the forward delivery port 40 with the exhaust port 43. Thus, depending upon the position of the valve member, air under pressure is delivered from the valve chamber either to the front or rear piston chamber, while air in the other piston chamber is permitted to exhaust to the atmosphere.

It will be seen that by the construction and arrangement set forth, the supply and exhaust of air from the respective piston chambers is accomplished through the use of ports and passages of short length, with no external connections save that required for supplying air to the valve chamber. At the same time, delivery of air to the motor is accomplished in a very simple manner through passages in the front piston receiving a supply of air from the front piston chamber and therefore only during the advancing movement of the plunger.

Rearwardly of the piston l5,'the cylinder is provided with a transverse partition 45 forming the forward wall of an oil chamber 46 having a piston 4'! therein so as to form a dashpot for controlling the advancing or feeding movement of the plunger l3 in the manner disclosed in my copending application Serial No. 749,567 (now Patent No. 2,488,992) and forming per se no part of the present invention. The rear wall of the chamber 46 is formed by another partition 48 in the cylinder, both partitions 45 and 48 being centrally apertured for the passage of the piston rod 16 which carries the piston 41. The space between the partition 45 and the rear piston l communicates with the atmosphere through a port 49.

The forward open end of the: cylinder in surrounds the drill chuck 25, and its extreme forward end carries a bushing 50. The latter constitutes adrill guide and serves in some instances as a part of a detachable connection (not shown) between the tool and a suitable .iig plate, serving to support the tool firmly at right angles to the work.

' size of the motor.

In view of the arrangement of the spindle drive motor and actuator in axial alinement, with the motor casing rigidly secured to the actuator plunger and the tool cylinder stationarily supported, means is provided for holding the motor casing against rotation relative to the cylinder. In the present embodiment the plunger l3 projects axially rearward from the dashpot chamber 48 and has rigidly secured thereto a rod 5i shaped for sliding but nonrotative engagement with the cyl'nder through the medium of a rearward extension thereof. In the present instance, the rod 5! is formed with flat sides 52 for passage through a slot 53 in an abutment 54, the latter being formed on an annular member 55 rigidly secured to the cylinder.

The rod 5| and abutment 54 are additionally utilized in limiting the forward feeding movement of the actuator plunger. For this purpose, the rod is screwthreaded and equipped with a pair of nuts 56, the foremost one of which engages with the abutment 54 to limit the extent of travel of the plunger.

The specific construction of the cylinder in may be varied as desired. As shown, the cylinder comprises a main section 5! having the partition member '11 integral therewith. The section 51 carries at its forward end a nose piece 58 which, in turn, carries the bushing 50, the sides of the nose piece 58 being suitably apertured as at 5% to permit of access to the drill chuck 25. Rearwardly of the main section 51 is an intermediate section 60 carrying the partitions and 48 of the dashpot piston chamber 46; and mounted on the rear end of this intermediate section is the annular member for coaction with the torque rod 51. Finally, the member 55 has mounted thereon a tubular tail piece 6| open at its rear end but serving to enclose the torque rod and its stop nuts.

Similarlythe plunger l3 may for convenience be of sectional construction. Thus it comprises, in the present instance, a forward portion 62 having the forward piston M integral therewith and the rear piston l5 screw threaded thereon; an intermediate section 63 screw threaded into the forward section-and carrying the piston 41; and the rod 5! screw threaded into the section 63.

It will be seen that the construction and arrangement set forth provides a portabletool which may be mounted in fixed relation to the Work and which is especially adapted to be supported'by a rigid nose portion in detachable relation to a jig plate or other support. The provision of a rotary spindle driving air motor guided for movement in the tool body by means of an axially alined pneumatic actuator minimizes the transverse dimensions of the tool so that a plu raiity of tools may be mounted side by sideiin closely spaced relation. Use of air under pres sure both for driving the tool spindle and for feeding purposes is especially advantageous in that adequate power from a remote source is rendered available notwithstanding the small By reason of the axial alinement of the motor and actuator the feeding thrust is applied most effectually to the cutting tool.

Of especial importance is the fact that while the tool is essentially of the portable type, when mounted in fixed relation to the work it provides its own support and guide for thetool spindle, the latter being carried by the motor which, in turn.

is guided by the stationary body of the tool.:

Thus t e reaction forces incident to the opera atlcn :of thetoolare borne byitheijig plate or-other support 'forzthe ztool, thereby relieving the operzatorrfromithe fatigue which accompanies the use :Of r-conventional portable tools, while insuring iproperpositioningof the tool relative to the work. Finally, the -.constructionprovides for control of the operation by means of a-simple two position valve, aswell :as for theeasy and convenient adjustment of :means for ilimiting the length of :stroke.

This application is a continuation in part of my prior application, Serial No. 602,592 filed June 30, 1945, now Patent No. 2,541,306, and of my prior application ;Se1'ialjNo."7 l9,5'6Z, filed May 21, 1949, now Patent No. 2,488,992.

. .I claim as .my invention:

1. An air-operated tool comprising inicombinaan elongated cylinder open at its forward .end, a rotary air motor 'havingacylindrical casing slidableaxially of ilie'cy'linder and a rotor ,insaidcasing with a tool spindle projecting forwardly into said open end of the cylinder, said casing having an air inlet opening in its rear end, a plunger in said cylinder comprising a piston rod having two axially spaced pistons, the forward one of said pistons being secured to the -,motor@ casing, a partition, member in said cylinder centrally apertured for the passage of said rod and defining with the two pistons forward and rear piston chambers, the forward one of said pistons being apertured for the passage of air from the forward piston chamber to the motor through its said air inlet opening, and means including a valve device mounted on the cylinder substantially in the plane of said partition and controlling the admission and exhaust of air under pressure to and from said piston chambers alternately, said cylinder having a rearward extension and said plunger having apart projecting rearwardly into said extension of the cylinder and having a slidable but non-rotatable connection therewith so as to hold the plunger and thereby the motor casing against rotation during the reciprocation thereof.

2. An air-operated tool comprising in combination an elongated cylinder open at its forward end, a rotary air motor having a cylindrical casing slidable axially of the cylinder and a rotor in said casing with a tool spindle projecting forwardly into said open end of the cylinder, said casing having an air inlet opening in its rear end, a plunger in said cylinder comprising a piston rod having two axially spaced pistons, the forward one of said pistons being rigid with the motor casing, a partition member in said cylinder centrally apertured for the passage of said rod and defining with the two pistons forward and rear piston chambers, the forward one of said pistons being apertured for the passage of air from the forward piston chamber to the motor throughjits said air inlet opening, and valve means controlling the admission and exhaust of air under pressure to and from said piston chambers alter nately, the cylinder and plunger having a non-rotatable sliding connection therebetween to hold the plunger against rotation, and further having interengaging stop means for limiting theforward movement of the plunger.

3. A portable power driven tool comprising an elongated body adapted to be mounted in fixed relation to a workpiece, an air motor, a tool spindle driven by the motor and adapted for connection with a cutting tool, said body having a chamber in its forward portion in which the motor is guided axially relative to the body for movement toward-andd'rom thezworkrarpneumatic actuator for. reciprocating the. motor includinga plunger :with piston .means thereon connectedwith the motor,.-said body having advancing; and retracting.piston-chambers disposed rearwardly'of the motor chamberin axial'alinement therewith, means controlling the .supply of -air under pressure to said .pistonchambers 'selectively andato said motor; including a two .position valve effective sin/each position to control the admission of airito one pistonchamber andi the exhaust Jof air (from the other :pistonchamber, and adjustable stop means :for limiting the extent of advancing movement of the motor :tby saidactuator.

A portable :power driven :tool comprising a body in the form of an elongated cylinder "having a coaxially disposed chamber .'-adjac'ent...the forward end thereof, an air motor comprising a casing guided for axial reciprocation in said chamber, a tool spindle connected with said motor and projecting forwardly for connection witha cutting tool, a pneumatic actuator icrire ciprocatingthe :motor including a-plunger with piston means thereon,said:body-having advancing and retracting piston chambers inaxial alinement with the motor chamber, :and said :motor casing having a supply port in constant communication with the advancing piston chamber, means for controlling the supply of air under pressure to said piston chambers selectively including a two position valve elfective in each position to control the admission of air to one piston chamber and the exhaust of air from the other piston chamber, and means including relatively adjustable interengaging stops for limiting the extent of advancing movement of the motor relative to the body.

5. A portable power driven tool comprising an elongated body adapted to be mounted in fixed relation to a workpiece, a rotary air motor, a tool spindle driven by the motor, said body having a chamber in which the motor is guided axially relative to the body for movement toward and from the workpiece, a pneumatic actuator for reciprocating the motor including a plunger with piston means thereon, said body having advancing and retracting piston chambers disposed in axial alinement with the motor chamber, and means controlling the supply of air under pressure to said piston chambers selectively and to said motor, said plunger having a rearward extension and relatively adjustable interengaging stops on the body and plunger extension for limiting the extent of advancing movement of the plunger.

A portable power driven tool comprising an elongated tubular body, a rotary air motor in the forwardend portion of the body having a casing guided by the body for movement axially thereof, and a rotor in said casing having a forwardly projecting tool spindle, said air motor being substantially greater in length than in diameter, a pneumatic actuator in the body disposed entirely rearward of the motor and comprising a plunger connected at its forward end to the motor casing and having piston means thereon, said body having advancing and retracting piston chambers in axial alinement with the motor, and valve means for controlling the admission and exhaust of air under pressure to and from the respective piston chambers to effect reciprocation of the motor.

7. A portable power driven tool comprising an elongated tubular body, a rotary air motor in the forward end portion of the body having a cylindrical casing guided by the body for movement axially thereof, anda rotor in said casing having a forwardly projecting tool spindle, said air motor being substantially greater in length than in diameter, a pneumatic actuator in the body disposed entirely rearward of the motor and comprising a plunger connected at its forward end to the motor casing and having piston means thereon, said body having advancing and retracting iston chambers in axial alinement with the motor, and a single two-position valve for controlling the admission and exhaust of air under pressure to and from the respective piston chambers to effect reciprocation of the motor, said motor casing having an air inlet communicating with the advancing piston chamber, whereby air is supplied to the motor coincident to the advance of said plunger.

8-. A portable power driven tool comprising an elongated tubular body, a rotary air motor havinga forwardly projecting tool spindle, a cylindrical casing enclosing said motor, said casing being guided by the body for axial movement in the forward portion thereof, said body having a centrally apertured partition therein rearwardly of the motor, a plunger comprising a piston rod slidable through said partition and having two axially spaced pistons on opposite sides of the partition, the forward one of said pistons comprising a disk on the piston rod removably secured to the rear end of the cylindrical motor casing so as to form a rear Wall therefor, said partition defining with said pistons forward and rear piston chambers, the forward piston being apertured for the passage of air from the forward piston chamber to the motor, and valve means controlling the admission and exhaust of air under pressure to and from said piston chambers alternately.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 484,224 McConnell Oct. 11, 1892 1,200,826 Forman Oct. 10, 1 16 1,628,621 Taylor May 10, 1927 2,103,252 Gartin Dec. 28, 1937 2,141,697 Russell Dec. 27, 1938 2,406,482 Tucker Aug. 27, 1946 2,488,992 Taylor Nov. 22, 1949 2,541,306 Taylor Feb. 13, 1951 FOREIGN PATENTS Number Country Date 2,499 Great Britain May 2 1882

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