US1992311A - Coordinated electric head and column clamp - Google Patents

Description

Feb. 26, 1935. p. c. KLAUSMEYER ET AL 1,992,311

CQORDINATED ELECTRIC HEAD AND COLUMN CLAMP Filed July 18, 193 1 3 Sheets-Sheet 1 avwentou DAVID c. K LAtggggfggR 61 BY H.HENRY SUN ER P 'IANN C AUEUSTUS MSOSA 1935- D. c. KLAUSMEYER Er AL 1,992,311

COORDINATED ELECTRIQ HEAD AND COLUMN CLAMP Filed July 18. 1931 3 Sheets-Sheet 2 l )4 ;2 l7 7 J 129.5

avweutou DAVID C- KLA MEY ECEASE WWW/ 1W D. c. KLAUSMEYER ET AL 1,992,311

COORDINATED ELECTRIC HEAD AND COLUMN CLAMP Feb; 26, 1935.

Filed July 18, 1931 3 Sheets-Shed 3 fillll llllllll-J lllL -IIJ.

I Submtou DA VID C. KLAU5ME YER BY H.HENRY SUN M 4- vc casso DERMANN :xzovron AUGUSTUS M. 505A 7 M2 d y Aka k2 Patented Feb. 26, i935 PATENT oFncE COORDINATE!) ELECTRIC HEAD AND CLAMP COLUMH David C. Klausmeyer, deceased, late of.Clncinnati, Ohio, by H. Henry S cm executor,

cinnati, Ohio, and Augustus M. Sosa, Cincinnati, Ohio,

asaignors to The Cincinnati Bicki'ord Tool Company, Cincinnati, Ohio, a

' corporation of Ohio Application July 18, 1931, Serial No. 551,613

0 Claims. (Cl. "-19 This invention relates to drilling machine tools of the radial arm type, and more particularly to the clamping mechanisms thereoi that are employed to lock the translatable or, movable members of the machine organization against movement during the drilling or tooling operation.

A prime object of this invention is to provide individually and independently operated power means for clamping and unclamping the several relatively movable members, particularly the saddle and the column members of a radial drill, whereby each may be independently operated to eiiect clamping or unclamping of the respective movable member; and as a further refinement, to provide a coordinated control means carried by one of the movable members and located within convenient reach of the operator, adapted to govern the individual and simultaneous operation of the several independent clamping mechanisms.

A further object is to eliminate manually actuable clamping mechanisms and to provide power operated means that will exert a clamping force adequate for the purpose, and which will exert a force constant in value at all times thereby reducing the wear and damage to the parts caused by irregular, and often unduly excessive forces exerted .thereon by the operator when actuating the manual clamping means hereto- .fore employed. And in addition thereto, to so design the control means for th'e power operated devices as to particularly safeguard .against injury to the-clamping means and actuators, as well as to save operating time, wherein the mechanisms operate only while the control members are manually actuated, and are automatically rendered inoperative the moment the operator removes his hand from the controlling devices. 7 a

The conventional radial drilling machine combines a base member upon which is mounted a rotatable column that supportsa radially disposed vertically translatable arm member. '-A tool head or saddle, in which is journaled the conventional rotatable and translatable drill spindle, is mounted upon the arm and adapted for translation therealong. To insure accuracy while drilling, the head and column must be rigidly secured to their supporting members, and it is obviously expedient, in the interests of savingboth operating time and labor, to provide means whereby the clamping and unclamping of both the head and'column may be quickly and eflectively accomplished by power, simultaneously as. well as individually, from apoint remote from the clamping m and convenient to the operator's normal working position. -Heretofore no adequate mechanism has been devised to save time andlabor in'this manner, and to safeguard against careless or improper operation.

To overcome these disadvantages, this invention provides electrically operated clamping mechanisms and control means including'selfopening switch members adapted to control the circuits nmning to the head and column clamping motors in such a manner that the operator may independently make or break the circuits to the several motors, or he may operate the several clamping means simultaneously thereby insuring that all the members be rigidly clamped prior to the starting of the tooling operation. I

The head clamping mechanism is carried upon the saddle, and includes a reversible electric motor, the shaft of-which has a threaded connection with a slidable clamping bar that isconstructed in a manner permitting a portion thereof to be drawn into engagement with one of the guideways of the radial arm thereby to impinge the head member to the'arn'a' The column clamping mechanism is likewise operated by a reversible electric motor, and the circuit therefor is also opened and closed by a control member located on the saddle, while a tertiary controlling switch coordinating the circuits of both clamp motors enables both clamps to be operated simultaneously. This last mentioned control switch is likewise mounted upon the translatable head member within convenient reach of the operator, thus there,is provided a plurality of'controls for selectively or collectively operating the various clamping mechanisms from the normal working position.

Each of the clamping motors isof the'type designed to withstand the passage of current for several minutes after becomingjstalled so that even though the control switch "on r for a limited time, no damage will be done to the mechanism. However, a further safety feature is in the provision for automatically breaking the electric circuit the instant the operator removes his hand from the control. This automatic feature is of special advantage'not only as a time-saver in eliminating a second movement otherwise n to-stop the motor, but also to exact the operator's'attentlon whenever the motor is working, the better to insure against improper operation.

Other objects and advantages will be i part To enable others skilled in the art so fully to apprehend the underlying features hereof that they may embody the same in the various ways contemplated by this invention, drawings depicting a preferred typical construction have been annexed as a part of this disclosure and, in such drawings, like characters of reference denote corresponding parts throughout all the views, of which:-

Figure 1 is a side elevation of a radial drill embodying the present invention. Fig. 2 is an enlarged elevation of the head clamping mechanism, partly in section, taken along the line 2--2 of Fig. 1. Fig. 3 in a fragmentary side view of the lower portion of the column, showing parts of the column clamping mechanism. Fig. 4 is a section along the line 44 of Fig. 3. Fig. 5 is a sectional plan view, along the line 5-5 of Fig. 1. Fig. 6 is a diagrammatic view of the coordinated electrical circuits and control switches therefor.

Referring to the drawings, Fig. 1 depicts a radial drilling machine embodying the present invention, combining a base 1,- supporting an upright post 2 upon which is rotatably mounted a sleeve 3. A radial arm 4 is translatably mounted upon the sieeve and is provided with suitable guideways 5 and 6 adapted to carry a translatable saddle 7 which in turn carries a vertically adjustable and rotatable tool spindle 8. Power for rotating the tool spindle is taken from an electric motor 9 carried by a projecting portion 10 of the radial arm, and is transmitted through suitable gearing and shafting, indicated generally as a, to the tool head '7 and the spindle feed and speed change gears journaled therein. Power is also taken from the arm shaft for raising and lowering the arm and also to translate the head in reverse directions along the arm. A manually operable hand wheel b is also provided for adjusting the head manually. However, inasmuch as these mechanisms are conventional devices and are well known, detailed description and illustration thereof has been thought unnecessary.

Referring to Fig. 2, the principal head clamping member comprises a bar 13, slidably mounted within the tool head housing 14, and provided with a notched or reduced portion 13 adapted to receive a downwardly extendingvportion 15 of the lower guideway 5. The clamping is eifected by drawing the bar forward until a wall 16 of the bar is brought into engagement with the rear face of the guideway 5. Further movement of the bar forward draws the rear face of the head tightly against the front face of the guide and thus clamps the head to the arm.

The actuating medium for the draw-bolt 13 comprises a reversible motor 1'7 secured to the drill head 7, the armature shaft 18 of which. has keyed thereto an internally threaded sleeve member 19. To permit free rotary movement of the sleeve member relative to the housing or head 7, two roller bearings 20 and 21 are provided, one on either side of a centrally disposed flange 23 formed on the sleeve. A suitable lock nut 22, threaded into the recess 22, presses against the outer hearing 20 and holds all of the parts securely in place. Cooperating with the threaded sleeve member is the threadedforward end of the notched bar 13, and as the motor 1'? is operated in a forward direction, the bar is drawn firmly in engagement with the guideway 5 and the head becomes clamped to the arm. It will be noted, that clamping is effected at thatv area that has a tendency to pull away from the arm during tooling operation and by locating the clamping means in that vicinity, onlyone'clamping member need beemployed to produce an effected and accurate locking mechanism. When the motor is operated in the reverse direction, the draw-bolt caused to recede, thus freeing the head from the lower guide and permitting easy adjustment of the head either by II'IBJIIJBJ. means orpower means.

the breaking point of any portion of the clamping mechanism that the motor is intended to operate.

Referring to Figs. 1 and 6, a control switch 24,

preferably of the spring push-button type, is provided for controlling the operation of the clamping motor 17, push- buttons 25 and 26 respectively being wired as to open and close the several circuits. To effect clamping of the head to the arm, the operator presses'the forward button 25; and so long as the button is depressed, the head clamping motor is connected with the power lines 55 and 56. Overloading or a burning out "of the motor is guarded against, however, firstly, because the motor is initially constructed to withstand a stalling of several minutes duration without damage, and secondly, switches are spring pressed and the moment the operator releases the switch the circuit to the motor is again disconnected.

- The clamping or unclamping of the members is effected almost instantaneously the moment the contact is made, the motor turning/only a few revolutions, and under ordinary operating conditions the control button is pressed for relatively short intervals of time. However, if for any reason the operator holds the circuit closed, he must keep the button depressed for a considerably longer period and inasmuch as three or four minutes is a relatively long interval of time for an operator to hold a push-button switch closed it will' usually be found that the longevity of the motor exceeds the patience of the operator and the switch will be released long before any overheating or damaging effects to the motor occurs. Thus is avoided possible injury to the mechanism by reason of the operator neglecting to turn off the power after the clamping operation is completed.

In like manner, to unclamp the mechanism the reversing button 26 is depressed and the motor rotates the sleeve 19 in the opposite direction until the shoulder 29, formed on the screw shaft 13, engages the extreme end of the cavity 22 formed in the drill head. The stop 29 thus suspends further unwinding of the clamp screw and the motor again comes to rest when the members are fully unclamped.

In setting up the machine for new work-pieces it is customary to swing the arm and head angularly about the post 2 in order to provide ample room over the work platform or base for the placing of new' work-pieces. After the work is securely fastened thereon the arm is again swung into position and the head translated therealong until the drill point is directly over the required since the control the sleeve member 3 is enlarged as at 31 and slotted axially and circumierentially as at 32 providing two wing portions 33 and 34 adaptedto be flexed tightly into engagement with the periphery of the central post 2. To accomplish the flexing movement a draw-bolt 35 is provided, the

forward end oi. which issplined to receive an' axially adjustable, externally threaded sleeve member 35 upon which is mounted a manually actuable nut 36. A look nut 40, threaded to the end portion 01' the draw-bolt, holds the sleeve 35- in a preselected axial position so that a given movement, of the draw-bolt eflects clamping of the sleeve to the post, the opposite end of the draw-bolt being secured to the other wing portion 33 of the sleeve in a manner presently to'be described A lever 39,integral with the nut '36 provides the means for manually shifting the draw-bolt to effect clamping or unclamping of the column sleeve whenever desired. Additional bolts 41*, mounted in bores in the flanges 38 and threaded into the flange 37, prevent too great expansion of the bell shaped portion 31 and carry the greater portion of the load when the clamping mechanism is released.

This invention proposes means for efl'ecting axial movement of the draw-bolt by power controllable from the operator's work station and for this purpose the opposite end-of the draw-bolt 35 is provided with a ring member 42 which encircles a cam or eccentric portion 43 of an oscillatable shaft 44 journaled in bearings formed in the sleeve 31'. The power to rotate the shaft 44 to clamp and unclamp the column, is provided by a reversible motor 45 mounted upon the column cap 46, (see Fig. 5) and which is adapted to rotate a vertical shaft 47 suitably coupled to the cam shaft 44.

g The rotor shaft 48 of the motor 45 actuates a. worm gear shaft 49 journaled within hearings in a bracket 50 secured to the cap and which transmits motion to the vertical shaft 47 through the worm 51 and gear segment 52. Suitabl'eabutments 53 and 54 are provided integral with the bracket housing 46 to limit the rotation of the gear segment and thereby prevent the shaft 47 from rotating too far in either direction after the column is completely clamped or unclamped. The motor 45, being reversible and similar in construction to the head clamp motor '17 previously described, is controlled fromthe operators normal working position in a manner similar to that described for the head clamping motor. a A description will now be given of the coordinated electric circuits to control the, passage of current to the head and column clamping motors to effect individual and/or simultaneous operation thereof. 1

In the diagrammatic Fig. 6, the mechanism indicated generally as A represents the circuit for operating the head clamping members,'while the mechanism 13 indicates the column clamping circuit. It will be understood that the several mechanisms therein shown are intended to represent conventional electrical instruments and detailed description of the instruments per sehas been thought unnecessary. The current is obtained through the power or lead-in lines55 and 56 and directed to the motors by means of the five pole switch elements 57, 58,59 and 60. The latter are actuated by solenoids 61, 62, 63 and 64 respectively, to connect the circuits, and by conventional resilient means such as springs (not shown) to break them. The solenoids 61 and 62 controlling the head clamping motor switches are connected to the power lines 55 and 56 and become energized upon the manual selective actuation or, the spring push-buttons 25 or 26: while similar buttons and 66 of the control switch 6'7 are provided for energizing the solenoids 63 and 64 or the column clamping mechanism.

When push-button 25 is depressed, two circuits .61, and the other, the motor circuit which is closed or completed by the solenoid actuated flve pole switch 57 located in the head clamping motor control box 90, and the motor is caused to be operated. As soon as the push-button 25 is released the circuit t the solenoid is broken and the latter becomes de -energized, after which the switch 57 snaps over to its open position and the rotation of the motor ceases. In a similar manner, the pressing of the push-button 26 causes the reversing switch solenoid 62 to become energized thereby to close the switch 58 and cause the motor 17 and clamping mechanism associated therewith to operate in the reverse direction.

The column clamping motor is controlled in the same manner, the pressing of push-button 65 eflects a forward or clamping movement of the motor 45, and pressing of the button 66 effects the reverse or unclamping movement of the motor. The current to the various switches and motors is conducted through the column and then by way of flexible cables 72 to the movable members in a well known manner.

By way of further refinement, this invention proposes means for actuating both of the above explained motors simultaneously in either direction thereby to clamp or unclamp the head and the column at one and the same time. This improvement contemplates the use of an additional push-button control switch 70, each of the buttons 68*and 69 oi. which, when depressed, closes four circuits, two in the head clamping mechanism and two in the column clamping mechanisn'i; the button 68 controlling the forward or clamping movement of the motors 17 and 45, and button 69 controlling'the reverse or unclambing movements of the motors, as shown in the clamping button of the coordinated control switch 70 and the'head and column become immediately clamped in their adjusted positions. In thi'sway the operator is assured that all of the parts are clamped and thus the possibility of one of the movable members remaining unclamped the tooling operation with consequent bodily injury'or damage to the tools or workpieces is avoided.

Without further analysis, the foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge,

readily adapt it for various utilizations by retain- (ill ing one or more of the features that, from the standpoint of the prior art, fairly constitute essential characteristics of either the generic or specific aspects ofthis invention and, therefore, such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claims:-

Having thus revealed this invention, there is claimed as new and desired to secure the following combinations and elements, or equivalents thereof, by Letters Patent of United States:-

1. A drilling machine combining a horizontally disposed arm member; guideways including an upper and lower guideway formed upon said am member; a tool-head member adjustably mounted upon said guideways; clamp mechanism for clamping said head to said arm comprising a draw-bolt carried by one of said members adjacent said lower guideway and the lower left portion of said head member adapted when actuated to clamp the lower left portion of the head member firmly to said lower guideway, and means for actuating said draw-bolt comprising a rotatable, but non-translatable nut element, an electric motor for actuating said nut selectively in reverse directions thereby to effect clamping or, unclampingaction, and self-opening push-button switch means carried by said head member for controlling the action of said motor.

2. A radial drill combining an upright support; a sleeve member movable thereon; a radial arm carried by said sleeve; a tool head slidable on said arm; power actuated clamping means electively operable to secure said sleeve firmly to said support, said means including an electric motor, and a control circuit therefor having an electro-magnetic switch therein; power operated clamping means, electively operable to secure said tool head firmly to said arm, including an electric motor supported upon said slidable head and a control circuit therefor having an electro-magnetic switch therein; push button switch means coordinating the circuits of said motors and adapted, when actuated, to effect simultaneous actuation of both of said clamp motors in a predetermined direction until they become stalled or until said push button means is released; and independent and selectively operable means for rendering each of said motors effective independently of the other, thereby to effect operation of its related clamping means independently of the other.

3. A radial drill combining anupright support; a sleeve member movable thereon, a radial arm carried by said sleeve; a tool head slidable on said arm; power operated clamping means for rigidly securing said sleeve against movement relative to said support including a reversible electric motor and a control circuit therefor having self-opening reversing switch means therein; power operated clamping means for rigidly securing said tool head against movement on said arm; a reversible electric motor and a control circuit therefor having self-opening reversing switch means therein; independently operable power devices for actuating the reversing switch means in the control circuits of each of said clamp motors; manually operable means for rendering any one of said power devices operative at will thereby to start operation of its related motor and clamp means; and separate means for rendering one of said power devices effective in each of said control circuits thereby simultaneously to operate the clamping means for said tool head and said sleeve until said clamp motors become rocasn stalled or until said separate means is released. '4. In a radial drill having an upright support; a column member rotatably mounted thereon; a

radial arm carried by said column and a tool head adjustable along said arm, the combination of electively operable power operated means for clamping said column to said support comprising a reversible electric motor and column clamping mechanism adapted to be actuated by said motor; a controlling circuit for said motor including a solenoid operated polarity changing switch means adapted to effect movement of said motor electively in a clamping or unclamping direction and self-opening push button switch means selectively operable to control the operation of said polarity changing switch means and thereby the actuation of said column clamping mechanism; clamping means for clamping said head to said arm; a second electric motor carried by said head for actuating said head clamping means; a second control circuit for said second motor including a solenoid operated polarity changing switch and self-opening push button switch means therefor selectively operable to actuate said last mentioned polarity switch to a position effecting clamping or unclamping action of said head clamping mechanism, all of said push button switch means being so located as to be operable by an operator from his position adjacent the drill head in any position of the said head along the radial arm;

and means, including an additional set of push button switch means, coordinating the control circuits of both of said clamp motors and adapted when actuated to effect simultaneous operation of both motors electively in a forward or reverse direction to thereby actuate said head and column clamping mechanisms simultaneously.

5. In a radial drill having a support; a. column member rotatably mounted thereon; a radial arm carried by said column and a tool head adjustable on said arm, the combination of power operated means for clamping said column to said support comprising a reversible electric motor and column clamping mechanism located adjacent the lower end of said column and adapted to be actuated by said motor; a control circuit for said motor, including a solenoid operated reversing switch means adapted to effect movement of said motor electively in a clamping or unclamping direction and a set of self-opening push button switch means selectively operable to control the operation of said reversing switch means and thereby the actuation of said column clamping mechanism; clamping means for clamping said head to said arm; a second electric motor carried by said head for actuating said head clamping means; a control circuit for said second motor including a second solenoid operated reversing switch and a second set of self-opening push button switch means selectively operable to actuate said second reversing switch to a position effecting clamping or unclamping action of said head clamping mechanism,and a third set of push q button switch means having connections with both of said control circuits andadapted when actuated to effect operation of a reversing switch of each motor whereupon both motors and their means in each of said circuits adapted for selective and independent operation to effect clamping or unclamping action of the motor driven clamping devices, each of said switches being adapted, when closed, to complete the circuit to its associated motor and when opened to break a the circuit to its associated motor; and manually operable self-opening switch means connecting both of said control circuits in parallel and adapt- 10 ed when closed to complete'the circuits to both of said motors simultaneously and when'opened to break the circuits to said motors thereby electively to eflect simultaneous clamping or unclamping action of both of said clamping devices.

H. HENRY SUNDERMANN,

Executor of the Last Will and Testament of David C. Klausmeuer, peceascd.

aooos'rus M. 808A.

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