US1634801A

US1634801A - Portable hand tool

Info

Publication number: US1634801A
Application number: US668628A
Authority: US
Inventors: Schneider Franklin
Original assignee: DORN ELECTRIC TOOL Co VAN
Current assignee: DORN ELECTRIC TOOL Co VAN; VAN DORN ELECTRIC TOOL Co
Priority date: 1923-10-15
Filing date: 1923-10-15
Publication date: 1927-07-05
Anticipated expiration: 1944-07-05

Description

\ 1,634,801 July 5, 1927- F. SCHNEIDER PORTABLE HAND TOOL Filed 001L215. 1923 s Sheets-Sheet l July 5, 1927.

F. SCHNEIDER PORTABLE HAND TOOL I Filed OCC. 15, 1923 3 Sheets-Sheet 2 July 1927' F. SCHNEIDER PORTABLE HAND TOOL 3 Sheets-Sheet 5 Filed Oct. 15, 1923 6H0: aw

" Patented July 5, 1927..

p 1,634,801 UNIT D s'TA' -Es PATENT OFFICE.

ERAEKLIN SCHNEIDER, or CLEVELAND, .onIo, AssIeNoE TO THE VAN onn ELEG* rn e TOOL COMPANY, 01 CLEVELAND, on o, A CORPORATION or 01110.

' PORTABLE HAND 'roon. Continuation of application lil'ed lay 9, 1923, Serial No. 637,795. This applicationiiled October 15,1923.

Serial No. 668,628.

ing and tapping holes, driving and with-1 drawing screws, setting up and taking off nuts, etc. The present application is a con tinuation of mycopending application for a portable hand tool, filed May 9, 1923, Serial No. 637,795.

The object of the present invention is to provide a portable, motor driven hand tool in which the tool spindle is connected to,

the motor by semi-positive clutch mechanism, thereby ensuring a positive drive and enabling large screws, nuts, etc. to be easily and effectively manipulated, the parts being so arranged that the clutch is respectively coupled or uncoupled prior to the making or the breaking of the circuit to the. motor.

Other objects of the invention are in part obvious and in part will appear more in detail hereinafte Referring to the drawings, which represent one suitable embodiment of my invention, Fig. 1 is a verticahlongitudinal sectional view; Fig. 2 is a detail plan view of the control for the spindle reversing mechanism; Fig. 3 is a view looking at the tool end of the device, with the cover of the front gear housing removed; Fig. 4 is a rear elevation of the control leverfor the clutch and the motor switch; Fig. 5 is a detailgvertical A sectional view of'the handle or grip portion; Figs. 6 and 7 are cross sectional views thereof on respectively the lines 66 and 7.7, Fig. 5, and illustrating the switch mechanism; and Fig. 8 is a detail elevation of the clutch.

, Referring to the drawings, my improved hand tool comprises a substantially cylindrical main frame 1 which receives the motor parts, comprising a field frame structure 2 and .an armature and brush structure 3, which are mounted ona motor shaft 4 sup ported at its rear end in a suitable ball bearlng structure 5. Said ball bearing structure is arranged in a suitable boss forming a part of an end head'6, which ishere shown as being integral with the main frame. At this point the main frame is provided with 'a downwardly extending, substantially oval shaped flange 7 to the rear surface of which is suitably secured the lower. part of the:

rear gear housing, later to be described.

Extending along what might be termed the bottom of the main frame, as vlewed' n Fig. 1, a'hollow tubular housing 8 through- .which extends a counter-or jack shaft 9, as

willlater appear. At the top, said frame is 7 provided with a longitudinally extending, hollow tubular housing 10 in which is suit spindle 11. Suitably secured to'the front endof the main frame, and engaging the tubular housings 8 and'lO, is a substantially oval reducing gearhousing 12, in the rear end head 13 of which is a suitable ball bear-.

end of the motor shaft 4. At the front end, said reducing gear housing is provided with a suitable cover 15. s

The main tool shaft or spindle 11 is slidably mounted in a bearing16 in the cover of the front gear housing 12 and in a relatively long bearing 17 in the top tubular housing 10. At its front end said spindle is provided with; a suitable tool chuck 18 of any preferred construction adaptedto hold a screw driver bit 19 Or' -a'ny other suitable tool, such'as a tap, a socket Wrench,.or'the like. Saidshaft 18. provided at its inner or rear end with a reduced portion 20, to which is secured, such as by the pin 21, a fixed collar 22. "Between said fixed collar and the shoulder 20:: of said spindle is a loose collar 23 to which is'secured a radially extending pin 24 having a suitable hand piece 25. Said pin extends through a substantially Z5 -shaped slot=formed in the tubular housing 10 and the bearing 17 therein, said slot comprising a longitudinally extending portion 26 and oppositely extending 27 and 28 at the ends thereof! The arrangement of these.- arts is such that the operator may grasp t e hand piece and move it from its position in lateral slot 28, as shown in Fig. 2, along the longi-.

-tudinal slot 26 to the front lateral slot 27'.

This permits a longitudinal shifting and holding of the shaft in either of two positions, this movement accomplishing a reversal in the direction of rotation of the main shaft 11,through mechanism to be later described, and thereby ermitting the use'of the tool in driving and withdrawing screws, setting up and taking off nuts, as well as operating a tap in its well known manner of operation.

Suitably secured to the rear of the main frame, including the downwardly 'extendin flange 7 thereof, is a rear'gear or clutc 6Q ably supported the rear end of the main tool mg structure 14 for supporting the front v lateral portions housing 29. @aid housing is provided with a rearwardly and upwardly extending handle or grip portion 30, and a forwardly and downwardly extending hollow arm portion 31 opening into the front of said housing, both ortions being preferably formed integral with said housing.

Mounted upon the motor shaft 4 and within the chamber 32 formed between the end head 6 of the main frame and the clutch housing 29 is the main driving pinion 33, which meshes with a gear 34 provided with a tubular hub 35 suitably supported in the main frame in alignment with the jack shaft housing 8. Preferably, a thrust hearing structure 36 is arranged between the front side of gear 34 and the end head 6 of the main frame to absorb the thrust on this side of the gear.

tluitably mounted in the lower end portion of the clutch housing 29 in axial alignment with the hub of gear 34 is a suitable bearing 37 adapted to support the rear end portion of the counter or jack shaft 9. Said shaft extends through the hub portion of gear 34, through the jack shaft housing 8 and is supported at its front end in a bearing 38 in the front end of the jack shaft housing and in a. bearing 39 in the cover 15 of the front reducing gear housing 12. Said shaft extends beyond this cover and is provided with a utility chuck structure 40 of any desirable or preferred construction.

Said jack shaft is slidable in its bearings and is provided near its rear end and within the clutch housing 29 with an annular clutch member 41, the hub portion of which is pinned or otherwise rigidly secured to said shaft. Said clutch member is provided with an annular series of saw teeth 42 adapted to mesh with a corresponding series of teeth 43 on the adjacent side of gear 34, the clutch teeth being preferably of such character that the tendency is to disengage under load, so that the clutch members must be held in coupled relation by axial pressure. Suitably secured to clutch member 41 is one or more spring tongues 45 adapted to yieldingly press against the rear face of gear 34 and thereby tend to move the jack shaft 9 with the clutch member 41 to the rear, or to the right as viewed in Fig. 1, so as to ensure the uncoupling of the clutch. Such rearward movement of the jack shaft is limited by the engagement of the clutch member 41 and the bearing 37. It is therefore obvious that when the jack shaft 9 is moved forwardly. or to the left as viewed in Fig. 1, the teeth 42 will mesh with the teeth 43 of gear 34 and cause the drive of the jack shaft. By the provision of a. semi-positive clutch, such as the dental clutch shown, .the tool spindle is positively driven so that the manipulation of large screws, nuts, etc, is easily and effectively accomplished,

neato 1 fit its front end and within the reducing gear housing 12 the jack shaft is provided with a wide faced pinion 46 adapted to mesh at all times with a'gear 47, which with pinion 48, are mounted upon a shaft 49 supported in the end head 13 and the cover 15 of the reducing gear housing 12. Pinion 48 meshes with a gear 50 mounted upon a shaft 51 supported in the same parts as shaft 49.

Gear 50 meshes with a hack pinion 52, which with a somewhat larger pinion 53, are mounted upon a shaft 54, supported in the same manner as

shafts

49 and 51. Mounted upon the main shaft or spindle 11 is a gear 55 which meshes with gear 50 when the main tool shaft is in its rear position, as in Fig. 1.. l ve will assume that when the parts are in this position the tool 19 is rotated in the proper direction to driving a screw, a tap, or set up a nut upon a screw or stud. In other words. this is the direct drive from the motor. When the main tool shaft is in its forward position, with the pin 24 in lat.- eral slot 27, gear 55 meshes with the pinion 53, and the direction of rotation of the main tool shaft and the tool 19 thereof is reversed It will thus be seen that the power of the motor may be transmitted through the clutch and gearing just described to drive the main tool shaft or spindle at a reduced speed at great power for use in various lines of work, as will be readily understood. It will also be seen that the reversal in the direction of rotation of the main tool spindle is readily accomplished by longitudinal forward move ment through the slot and pin structure shown in detail in Fig. 8.

It is also clear from the foregoing that the utility shaft chuck 40 may be utilized for drilling or other purposes where the first reduction in gearing from the pinion 33 and gear 34 is sufficient, and that the application of the power to the jack shaft 9 is controlled through the clutch. This utility chuck may be very aptly used for drillingholes for screws which are afterwards set up by a screw driver bit carried by the main tool shaft.

The handle or grip portion 30 of the clutch housing 29 is provided in its lower end portion at the rear thereof with a longitudinally extending slot 56. Arranged in said slot and pivot-ally mounted in the lower end thereof on a pin 57 is a suitable control lever 58 extending upwardly to substantially the top of the handle, as clearly indicated in Fig. 1. Near its lower end and above the pivot pin 57, said control lever is provided with a shoulder 59 for engagement with a ball 60 mounted in the rear end of the jack shaft 9. Said control lever is normally moved outwardly or to the right, as viewed in Fig. 1, by a suitable spring 61 arranged within the slot 56 and secured at its lower end to the grip or handle portion 30, movescrews 66".

1 ment ofsaid control lever being limited by a pin 62 mounted in the handle portion and extending through a slot 63 in the control lever. It will thus be seen that the clutch is normally uncoupled.

Secured within an inwardly extending recess or chamber 64 in the upper, rear portion of the grip. or handle portion is the motor switch.v The inner, side and bottom.walls of said chamber are lined with suitable insulating strips 65, while the front of said chamber is closed by an arc-shaped cover plate 66, secured to the grip or handle portion by any suitable means, such as the Suitably secured to the inner surface of said cover plate, as by the screws 67, is a bracket 68 having inwardly extending arm portions 69 inclined at their outer ends toward but spaced from each other, as clearly shown in Fig. 1. Said frame and said cover plate are each provided substantially midway of its ends with a slot or opening, said slots being in registering relation. Extending through said slots is a suitable bell crank lever suitable means the means here shown being a pin 70 extending through said lever and engaging in suitable slots or openings in the bracket 68. Pivotally mounted to the inner arm 71 of said lever is an oscillating contact member 72 having at its free end a contact 73 adapted to bridge the two stationary contacts 74, 75 when said contact member is oscillated to one extreme position. Said stationary contacts 74, 7 5 are suitably secured to the side walls of the chamber and are respectively provided with binding posts 76, 77 to which are connected the wires 78 as clearly shown in Figs. 1 and 5. These wires are in one side of the circuit to the motor or, in,other words, this switch is inserted in one of the leads coming in through the supply cable 7 9 which 29, as shown in Fig. 4. Any suitable and desirable wiring diagram may employed and it is obvious how the parts and the ar- I rangement thereof may be utilized in carrying out any preferred diagram. The top of said chamber is. open to the passage within the hollow arm portion 31 of the clutch housing 29, the wires.v 78 extending through said passage to the motor, as clearly shown in Fig. 1. Said oscillating contact member 72 is provided near its free end with an opening 79 through which extends a coil spring 80 having its ends suitably secured to the bracket 68. This spring causes, the contact member to oscillate with" a snap movement, as will bereadily understood, oscillation of said contact member being limited by the. inwardly extending inclined arms of the bracket 68 against which arms it is adapted to rest. The outer arm 81 of the bell crank lever pivoted in frame 68 engages in a recess 82 in the free end portion of control lever 58, by which it is actuated, a spring 83 wound around the pivotal axis of the bell crank lever and engaging the bracket 68 normally forcing arm 81 outwardly, the position shown in Fig. 1. The oscillating contactmember is therefore normally held in the position shown in Fig. 1, in which position the switch is open.

From the foregoing it will be'seen that I have provided a portable hand tool in which the tool is positively driven, so that large screws, nuts, etc. may be easily and effectively manipulated; and in which the clutch. switch and control lever are so arranged that the clutch is respectively coupled or uncoupled prior to the making or the breaking of the .motor circuit. The motor is therefore running idly when the circuit is broken which materially increases the lifeof the switch mechanism and the motor commutator because dangerous and injurious arcing is avoided. Y

Having described my'invention, I claim:

1. In a motor hand tool, a motor, a tool spindle, driving connections between said motor and said tool spindle and including a clutch having interlocking parts, a: controller for said motor, and hand operated means for operating said clutch and said controller, said means being so arranged as to couple the clutch prior to the actuation of the controller to start the motor.

2. In a motor hand tool, a motor, a 'tool spindle, driving connections between said motor and said tool spindle and including,

a clutch having interlocking parts, a controller for said. motor, and operating means for said clutch and sa'id controller, said operating means being so constructed andarranged that said controller is actuated to start or stop the motor only after said clutch has been respectively coupled or uncoupled.

3. In a motor hand tool, a motor, a tool spindle, driving connections between said motor and said tool spindle and including ,a clutch having interlocking parts, an enclosing casing for said motor, spindle and driving connections adapted to be supported by the hands of the tool operator, said carsing being provided with a hand gripping portion,,and operating means for said clutch and said controller arranged within the hand gripping portion of said casing, said operatmg means being so constructed and arranged that said controller is actuated to start or 'stop the motor only after said clutch has been respectively coupled or uncoupled.

In testimony whereof I hereby afiix my signature,

FRANKLIN SCHNEIDER.