Патент USA US2132088код для вставки
Oct. 4, 1938. J. E. TORBERT. JR ' 2,132,088 SPEED CHANGING MECHANISM Original Filed March 4, 1936 Ax/ 2 Sheets-Sheet l I Swumm 1 2 Join E. Ybr?efigeff. Oct. 4, 1938. ' J. E. TORBERT, JR 2,132,088 SPEED CHANGING MECHANISM Original Filed March 4, 1936 , 2 Sheets-Sheet 2 F'wzZ j JoAn Z’. Tbrberi?]: Patented Oct. 4, 1938 was? UNITED STATES PATENT OFFICE * 2,132,088 SPEED CHANGING MECHANISM John E. Torbert, Jr., National City, Calif. Original application March 4, 1936, Serial No. 67,146. Divided and this application Septem ber 10, 1936, Serial No. 100,183 3 Claims. This invention relates to an improved speed changing mechanism particularly adapted for use with electric drill tools and the like and is a division of my co-pending application for a patent 5 for a Drill, Serial No. 67,146, ?led March 1l, 1936; now Patent No. 2,106,937. One object of my invention is to‘ provide a speed changing mechanism which will permit the drill chuck of ‘an electric drill or the like to be 10 driven at either high or low speed, depending upon the work to be drilled, so that the necessity of the operator removing his hand from the handle of the device to effect speed changes at remote points will be obviated. " Another object'of the invention is to provide a device of this character which will be simple in construction, light in weight, and positive in action. A further object of the invention is to provide 15 :a speed changing mechanism wherein provision 2 O is maderfor turning off or on the motor employed (Cl. 77—7) lower portion ' provided with an opening‘ inter mediatev its length for permitting the establish ment of communicationwith the handle which is hollow throughout its interior, and in this bore there is ?tted a tubular shaft housing 4, held in place and prevented from rotating by set screws 5. Bearings 6 and ‘l are rotatably mounted in the shaft housing to support a shaft 8 which termi nates at its forward end in a head or ~nipple 9 formed with a squared shank i0 adapted to cor 10' respond to a socket formed in a like shank on a drill chuck which is adapted to be screwed on the projecting threaded end portion H of the shaft housing 4. Lock nuts l2, which are adapted to lock the housing 4 in place, are carried by the threaded portion ||. A beveled gear I 3 is ?xed to the shaft 8 forwardly of the bearing l and is adapted to mesh with a companion beveled gear I4 which is carried by a shaft l5 rotatably mounted in the handle I by hearing bars I6 ‘and ll‘which extend transversely in the handle and 2'0 for driving the drive shaft of said mechanism. Y are secured in place by screws l8. An' opening I91 A further object of the invention is to provide is formed in the‘tubular shaft housingll in order 2 UK a speed changing mechanism wherein a remov that the beveled gears |3 and I4 may have ready >. able auxiliary handle is employed for permitting meshing engagement with each other. Byv re; fern'ng to Figure 2 of the drawings, it will be’ both hands of the operator to be used when it is desired'to exert great pressure upon the work being drilled. 30 Other and incidental objects of the'invention will render themselves apparent as the descrip tion' proceeds. ' _ 'My improved speed changing mechanism is il lustrated in the accompanying drawings, wherein: 35.» ' Figure 1 is a vertical sectional view of the seen that the shaft l5, which is better known as a countershaft, is loosely received in clutch sleeves 28 and 2| which are journaled through the bear ing bars I6 and M, respectively. Disposed on the countershaft I5 and between the clutch sleeves, 30v 2E] and 2| is a clutch sleeve 22 which is-slidable longitudinally on the countershaft but is held against rotation thereon by a key 23. By shift ing the clutch sleeve 22 longitudinally upon the countershaft, it will be understood that selective 353 engagement of said'clutch sleeve 22'with either of the clutch sleeves 2B or 2| may be had and, looking in the direction indicated by the arrows. ‘ furthermore, by disposing the clutch sleeve 22, 40 Figure 3 is a transverse sectional View on the midway between the clutch sleeves 20 and 2|, 401 line‘3—3 of Figure 2. rotation of the countershait may be brought to Figure 4 is a fragmentary detail plan View a stop. Actuation of the shiftable clutch sleeve 22 is accomplished through the medium of a showing the actuating button shank and open structure; Figure 2 is a vertical sectional view of the mechanism, taken along the line 2—2 of Figure 1, ing therefor. ' p ' boss 24 having arms 25 which are engaged in a circumferentially extending groove 26 formed ‘in said shiftable clutch sleeve. The boss 24 projects from a flat plate 21 which bears‘ against the inner various views, the numeral | indicates in general , face of a detachable closure plate 28 carried by a handle of my improved speed changing mecha the handle I. In order to hold the plate 21 against the closure plate 28 I have provided 50 nism which carries at itsupper end a tubular head 2 projecting upwardly and rearwardly there resilient strips 29 which are carried by blocks from. The handle de?nes a housing for the gear 38, which blocks projectv inwardly from the ing employed, as will be seen hereinafter. The closure plate 28. rear end of the tubular head is closed by a As best seen in Figure 3 of the drawings, teeth 3| project from the resilient strips 29 to engage, 557 55 threaded plug _3. The bore of the head 2 has its Referring now more particularly to the draw ings, wherein like numerals of reference will be seen to designate similar parts throughout the 2,132,088 in grooves 32 formed in the plate 21 and which are adapted to guide sliding movement of said plate. Attention is directed to the fact that when mounted in the wall 46 of the handle I, where it is secured in place by a set screw 55. From the terminal socket 53 extend conductor wires 56 the teeth 3| are out of the grooves 32, as shown which lead upwardly through the handle I and in Figure 3, the resilient strips 29 will apply pressure to the plate 21 and hold it ?rmly against are attached to contacts 51, carried by a block of insulation 58, which is mounted in the inner the inner face of the closure plate 28 to prevent the escape of lubricant .with which, the hollow handle is ?lled, through an opening 33 formed in 10 said closure plate substantially medially thereof. The opening 33 extends longitudinally of the 0105-. ure plate and has lateral recesses or extensions 34 and 35, at its opposite ends, which, extensions serve as seats for the shank 36 of the actuating 15 button 31. The button 31 terminates in a stem or shank which is tightly screwed. into a socket formed in the plate and the shank of the boss 24 and, referring to Figure 4 of the drawings, it will be readily seen that by grasping the button wall of a socket 59 formed at the rear of a trigger guard 63 which trigger guardprojects . forwardly from the handle I under the head 2. In the guard there is mounted a trigger 6| which is pivoted at its upper end, as shown at 62, and carries a lug 63 for shifting the arm 64 inwardly against the action of a spring for bridging the contacts 51 when pressure is applied to the trig 15 It will thus be seen that an operator, grasping the handle i, may easily pass a ?nger through the trigger guard and, by applying pressure to the trigger, close a circuit for setting in opera tion the motor’ connected to a source of power 20 20 31 the shank 36 thereof may be shifted longi tudinally of the opening 33 in either direction for and to the contacts 51. When the trigger is re leased, the circuit will be broken by reason of the shifting the clutch sleeve 22 from a neutralrposi tion, as shown .in Figures, 1 and 2, ‘to an opera-.. fact that the spring 65 will urge the arm 64 out-v wardly out of engagement with the contacts 51. tive position, in which position it will have oper In some instances, it will be desirable to hold 25:. 25 ative engagement with the clutch sleeve 2|! or the the drill in both hands so that it may be held clutch sleeve '2 I , according to the direction in which the button 31 is moved. When the button very easily and so that more pressure may be ap ~ reaches either end'eof the opening 33, it will be plied if necessary. Therefore, in order to accoma moved laterally into either the recess 34 or the , plish this, I provide an auxiliary handle indicated 30 recess 35, according to the direction in which it in general by the numeral 66 and which includes 30' has-been shifted, and the shiftable clutch sleeve a relatively short metalbar 61 having a threaded will thus be. ?rmly held in a set position and end portion 68 adapted to be screwed into the rotary motion willv be imparted to the shaft l5 socket 59 of a yoke 19. The arms 1| and 12 of either by the clutch sleeve 26 or the clutch sleeve the yoke diverge from the socket 69 so that they . ' will have ?at contacting engagement with-the 35 2|. The clutch sleeve ZOis formed'with a cir cumferentially extending spur gear 38 which beveled side faces of a saddle'13 which is formed meshes with a companion gear 39 carried by a integral with the head 2 by thickeningthe inter-v mediate portion of said head. As best seen in . ' shaft 40. As best seen in Figure 1 of, the draw Figure 2 of the drawings, this saddle projects ings, the shaft 40 is- journaled through the hear from opposite sides of the headto form shoulders 40 40 ing bars l6 and I1 and has its rear end ter~ minating in_ a socket 4| vadapted to receive the andv the free, or lower end portions of the-arms ' shank 42 of a ?exible shaft 43 when the cable 44 ' 1| and 12 are bent to form hooks 14 which engage of said flexible shaft is screwed into a threaded under the shoulders ofthe' saddle. It will also socket 45 which is formed in the thickened lower . be seen in Figure 2,.that when the handleGB is endwall 46 of the hollow handle I. It will be screwed into the socket 69,'the innerend of said 4,5 handle will engage the upper face'of the: saddle " understood that the shaft '40 rotates at the same rate of speed as the flexible shaft 43 and, and Will exert a pull upon the arms 1| and 12 of as the clutch 2|] turns at thesame rate of speed the yoke and cause their hooked ends tobe' as the gear 39, rotary‘ motion at a ‘high speed moved into tight binding engagement with the will be transmitted to the shaft I5 and thus to shoulders of , the saddle. The handle will ‘thus 50, 50? the‘shaft 8 when the shiftable clutch sleeve is in. be ?rmly held in place on the saddle andthe »' operator may grasp the handle 66 with onehand engagement with the clutch sleeve 23. and the handle | with the other hand so‘ that The countershaft l5 will be rotated at a re the entire mechanism may be held very easily duced speedwhen the clutch sleeve 22 is in en ‘ ' ' " ' 55. 55 gagement with the clutch sleeve 2 I, as the clutch when in use. sleeve 2| ‘carries, at its rear‘ end, a beveled pinion When the auxiliary handle is not needed, it' is ' > 41 which meshes with a companion beveled only necessary to rotate the metal bar 61 thereof pinion 43 carrie'd'by a Worm gear 49, the Worm in a direction to loosen it, so that the'hooked ends 1 I gear being rotatably mounted and having the 14 will be freed from binding engagementwith 60 stem ‘55 thereof journaled in a block‘ 5| which the saddle. The yoke may be shifted longitudi 60: projects rearwardly or downwardly from the bear nally of the saddle out of engagement therewith ' ing bar l1 integral therewith. The marginal so that the auxiliary handle may be laid aside teeth of the worm gear 49 are disposed in mesh until again needed. ing engagement with'threads of the worm 52 It is thought that a reading of the foregoing“ 65 which is carried on and ?xed to rotate with the description will disclose that I have provided a 65 shaft 40. It will thus. be seen that a drill may be simple yet highly efficient speed changing mech-i " operated either at high speed or at low speed, anism. according to the type of materialin which an Having thus described the invention, what I" opening is to be drilled. ‘It will further be under— claim is: " " ' 1. In a speed changing mechanism, a’ handle 70 70 1 stood that the actuating button 31 may be quickly shifted for controlling the speed or completely de?ning a housing, a head carried by the ‘handle stopping rotation without the necessity of the and having a bore, a tubular'shaft housing in the ~ operator removing his hand from the handle I of bore, a shaft in the housing, a countershaft in' the tool. -‘ A ‘terminal socket 53, to receive the the handle, means rotatably mounting the coun-7 ‘ prongs of an electric connecting plug 54, is tershaft in said handle, clutchsleeves rotatably" ger. _ < 3 2,132,088 mounted on said countershaft, a movable clutch sleeve slidable on the countershaft and ?xed to rotate therewith, means carried by the handle for shifting the movable clutch sleeve, a drive shaft carried by the 'handle, a ?exible shaft operatively connected with the drive shaft, a worm carried by the drive shaft near its lower end, a gear carried by the shaft at its upper end, a gear carried by one of the clutch sleeves and 10 adapted to engage said ?rst mentioned gear, means rotatably connecting the worm with the other of said clutch sleeves, and means for im parting rotation from the countershaft to the ?rst mentioned shaft, said movable clutch sleeve 15 being adapted for connecting the countershaft to one of said clutch sleeves for relatively slow ro tative movement or to the other of said clutch sleeves for relatively fast rotative movement. 2. In a speed changing mechanism, a handle 20 de?ning a housing, a head carried thereby and having a saddle, an auxiliary handle associated with the head and having a relatively short bar terminating in a threaded end portion, and a yoke having arms straddling the saddle and ter 25 minating in hooks adapted to engage the saddle, said short bar being adapted to be screwed into de?ning a housing, a head formed thereon and having a bore, a shaft housing carried by the bore, a shaft rotatable in the bore, bearings journaling the shaft in the bore, a countershaft carried by the handle, beveled gears for trans Cl mitting rotation from the countershaft to said ?rst mentioned shaft, clutch sleeves rotatably mounted on the countershaft and having gears thereon, a movable clutch sleeve slidable longi tudinally on the countershaft and ?xed to rotate therewith, means carried by the handle for shift ing the movable clutch sleeve, a drive shaft, a ?exible shaft exteriorly of the handle and oper atively connected with the drive shaft, a gear carried by the drive shaft and adapted to mesh with a gear of one of the clutch sleeves for transmitting high speed rotation to said clutch member, a worm carried by said drive shaft for transmitting low speed rotation to the other ' of said clutch sleeves, and bearing bars carried 20 within the handle for mounting said shafts and sleeves, said movable clutch sleeve in one posi tion being adapted to transmit relatively’ slow rotative movement to the ?rst mentioned shaft and in another position to transmit relatively 25 high speed rotative movement to said ?rst men the yoke for tightening the hooks against the tioned shaft and said movable clutch sleeve being saddle and retaining the auxiliary handle on the head and said bar being rotatable for releasing shiftable to an intermediate position for retain 30 the auxiliary handle from the head. ing the countershaft in a non-rotating position. ~ 3. In a speed changing mechanism, a handle 30 JOHN E. TORBERT, JR.