Патент USA US2286176код для вставки
June 9, 1942. 2,286,1 76 E. D. BOISSELIIER MOTOR ASSEMBLY Filed Oct. 25, 1958 § Patentecl June 9, 1942 2,286,176 UNITED STATES "PATENT OFFICE 2,286,176 MOTOR ASSEMBLY Earl D. Boisselier, Glen Ellyn, 111., assignor, by mesne assignments, to Earl Products Company, Chicago, 111., a corporation of Illinois Application October 25, 1938, Serial No. 236,953 2 Claims. (Cl. 172-126) This invention relates to motor assemblies for provided with openings C’ which permit of air use in connection with engraving apparatus, and circulation within the handle or casing A, and more particularly to a motor assembly for use with a central bottom opening I for receiving with a so-called tapping tool especially adapted the reduced end portion 2 of a stud 3. for making stippled designs in light sheet metal The said reduced portion of the stud may be or similar surfaces. One of the objects of the invention is to pro riveted or peened or otherwise turned over the edges of the metal of the cap surrounding the vide a construction which includes a novel mo opening I to rigidly fasten the stud 3 to the cap. tor assembly possessing special features of con In that connection, it will also be observed that struction which lend themselves to standard 10 the reduced portion 2 of the stud passes through manufacturing practices, and thereby make it a suitable opening in the transverse web portion possible to provide a relatively inexpensive, sub 4 of a frame which includes the upstanding arms stantial, and highly efficient unit. 5—5. Thus, when the reduced portion 2 of the A further object of the invention is to provide stud 3 is passed through the transverse member a construction in which the novel motor assem of the frame and the opening I of the cap, and bly may be readily combined with a handle which riveted or peened as indicated at 2a; the stud, the not only constitutes a housing for the motor, frame, and the cap will all be rigidly locked to but at the same time affords convenient means gether as one piece. for gripping and manipulating the tool. The-stud 3 is provided with a central opening With the above and other objects in view which ' will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and ar rangements of parts hereinafter more fully de scribed, illustrated and claimed. A preferred and practical embodiment of the invention is shown in the accompanying draw ing, in which: Figure 1 is a side elevation of the improved motor assembly. Figure 2 is an enlarged vertical section of the improved motor assembly. or bore 3a which serves as a guide for the shank. of a tool such as a tapping point or pin P. Thev upper portion of the opening or bore 3a in the: stud is enlarged as indicated at 312 to provide a. chamber or socket for a coil spring 6 which sur rounds the upper portion of the pin P adjacent. a solenoid type armature member ‘I. Since the. spring 6 is con?ned between the bottom of the: socket in the stud and the underside of the sole-4 noid type armature, it will be apparent that the said armature 1 as well as the pin P will nor mally be urged upwardly in the bore of the stud. Acoil 8 surrounds the stud and armature, the said coil being positioned between the arms 5—5 of the frame. As will be apparent from Figure Figure 3 is a detail sectional view of the top portion of the motor assembly taken at right angles to Figure 2. 35 2, the upper portions of the arms 5-5 are ex Figure 4 is a top plan view of the motor assem truded inwardly as indicated at 9 to engage the bly shown in Figures 2 and 3. top of a coil 8 and hold it in position. In as Figure 5 is a diagrammatic view illustrating sembling, the inherent resiliency of the arms the ‘electric circuit employed. 5—5 permits them to be spread apart su?iciently Figure 6 is a detail perspective view of the im 4-0 to permit the coil 8 to be moved over the arma proved motor assembly. ture ‘I and the stud 3. When the coil is in place Similar reference characters designate corre the arms 5—5 may be drawn together, thus sponding parts throughout the several ?gures of bringing the extruded portions 9 into overlying the drawing. and holding engagement with the upper end of According to the embodiment of the invention 45 the coil. shown in the drawing, the same includes in its With further reference to the upper portions organization a hollow handle A made of wood of the arms 5—5, it may be pointed out that the or other insulating material, and the tapping same are provided with suitable slots [0 for re unit B. This unit has rigid therewith a cap or ceiving a transverse insulation piece II. This cup portion C which is preferably of stamped 50 insulation piece is provided with a central open metal, and closes the lower end of the handle. ing [2 to clear the armature pin or insulation That is to say, this cap or cup member C‘ is in element I3 carried by the upper end of the tended to receive the reduced end portion A’ armature 1. This insulation bridge piece consti of the handle or casing A as shown by dotted tutes an abutment or stop for the armature 1, lines in Figure 2. Moreover, said cup is also 55 thus limiting the upward movement of the arma 2,286,178 2 ture under the force of the spring 6, and pre venting the armature pin from unduly punishing sembly comprising a solenoid coil, a tool actu ating armature reciprocable in said coil, mount ing means for said coil comprising a pair of arms the contacts, later referred to. Moreover, it will be observed that the upper means on said arms to secure the coil between said extremities of the arms 5-—5 are bent inwardly as indicated at I4 and provided with relatively narrow tongues l5 which in turn provide shoul coil, said coil being effective, when energized, to arms, spring means tending constantly to urge said armature in one direction relative to said move said armature in the opposite direction rel ative to said coil, an insulating disc held by extremities of the tongues I5 are twisted so as to pull the entire ?bre plate or disc l6 against the 10 said arms in ?xed relationship to said coil and limiting movement of said armature by said shoulders formed at the base of the tongues I5. spring means, an insulating strip held .by said ders for supporting a top insulation disc 16. The The insulation disc I6 carries a pair of spring contacts i8 and I9. The contact 18 is connected with the coil 8 by the lead l8a shown in Figure arms in ?xed relationship to said coil, a switch controlling supply of current to said coil, said switch comprising a pair of contacts carried by 3a and the contact 19 is connected with the line 15 said insulating strip, a yieldable mounting for wire 20. The coil 8 has its other terminal con at least one of said contacts tending constantly nected with the line-wire 2| as will be seen to urge it away from the other contact, and from Figures 3 and 5. means whereby said armature, when urged As shown in Figure 2, the points of the con against said stop means by said spring means, 20 tacts l8 and 19 will be normally held in en holds said yieldably mounted contact engaged gaged relation by the pressure exerted through With the other contact thereby completing the the insulation element I3 carried by the solenoid coil circuit, and releases said yieldably mounted or armature l which is urged upwardly by the contact to permit it to separate from the other spring 6. Thus, when the line wires 20' and 2| contact when the coil is energized and the arma are plugged into a service outlet, the circuit 25 ture thereby is moved against said spring means. will be completed through the coil 8v and thus 2. A tool operating reciprocating motor as pull the armature 1 toward the center of the sembly comprising a stud having an interior bore coil. When the armature is thus pulled down and a spring receiving socket, and also reduced wardly, the insulation element l3'will be moved in external diameter at one end, a frame in away from the contacts I8 and I9 and the latter 30 cluding a pair of arms connected by a transverse will spring apart or separate as shown in Figure portion having an opening, a cup also having an 5 thus breaking the circuit. As soon as the opening, the openings of the transverse portion circuit is broken the spring 6 will again exert its influence to move the armature 1 upwardly of the frame and‘ the cup registering and ?t ting over the reduced end of the stud, a rivet and in turn press the points of the spring con 35 portion formed at the extremity of the reduced tacts i8 and I9 together as shown by the dotted end of the stud to lock the cup and frame to the lines in Figure 5, and also by full lines in Fig stud, a coil ?tted over the stud and embraced by ure 2. said arms, inwardly directed portions on the The above described electrical operation is arms for engaging one end of the coil to hold it repeated as long as the tool is connected in cir 40 in the arms, an armature in the coil and having a cuit with a source of alternating current supply. tool portion extending through said bore of the The result of the electrical action is to produce stud, a spring in the socket of the stud tending a rapid vibration of the tapping point P so that ' when the tip of the point is held close to a sur face to be stippled, said surface will be impressed l with a plurality of indentations of greater or constantly to urge the armature in one direction relative to said coil, a switch mounted on said arms and controlling supply of current to said coil, said switch comprising a pair of contacts less depth, according to the distance that the operator holds the tip of the point from the sur carried by a support mounted on said arms, a yieldable mounting for at least one of said con— face to be stippled. ‘ From the foregoing, it will be apparent that 50 tacts tending constantly to urge it away from the other contact, and means whereby said ar the, present invention provides an engraving tool mature, when urged against said stop means by with a novel tapping unit which may be easily said spring means, holds said yieldably mounted fabricated and assembled, and which may be contact engaged with the other contact, thereby completely wired so that the line wires may be completing the coil circuit, and releases said 55 pulled through the hollow handle A and the yieldably mounted contact to permit it to sep cap or cup C of the unit will thereby be pulled arate from the other contact when the coil is into engagement with the reduced end portion energized and the armature thereby is moved A’ of the handle to complete the assembly of the against said spring means. device and properly encase or house the tapping unit. I claim: 1. A tool operating reciprocating motor as 60 EARL D. BOISSELIER.