Патент USA US2137658код для вставки
Nov. 22, 1938. E. F. TERRY v 2,‘ 7,658 DRILLING TOOL Filed Oct. 9, 1937‘ “UhRMW M“+2w 1_-. . 5206.a4“WW 0WW1“ Em... . WIM. a/< / \2 2 9n1will‘9439a29d \\w F m mW Patented Nov. 22, 1938 2,137,658 r UNITED STATES PATENT OFFICE 2,137,658 DRILLING _ TOOL Edward F. Terry, Phillipsburg, N. J., assignor to Ingersoll-Band Company, Jersey ,City,IN. J., a corporation of New Jersey Application October 9, 1937, Serial No. 168,193 1 Claim’. (Cl. 255-64) This invention relates to drilling tools, and more particularly to drilling tools of which the cutting bit is formed as a separate member and stem 28 adjacent the juncture of the stem and the shank 2!. The front end of the reduced por attachable to the shank serving to transmit the 5 glows of the percussive element to the cutting it. tion 33 serves a similar function for a pilot 35 on 5 > the forward extremity of the stem 28, and inter One object of the invention is to assure an mediate the pilots 34 and.35 are threads 36 to ample supply of cleansing ?uid directly to the cooperate with threads 31 in the reduced portion 33 of the bore 21 for securing the drill bit to, the source of cuttings. Another object is to assure the utilization of shank 2i. the full force of pressure of ‘the cleansing ?uid for dislodgingand removing cuttings from the bottom of the hole being drilled. 10 ‘ , jacent the stem 28 to provide a wide path through which the force of the blows may travel to the 15 Other objects will be in part obvious and in_ skirt 22 and thus to the cutting wings 23. , part pointed out hereinafter. ' ' s In the drawing accompanying this speci?ca tion, ' > Figure 1 is an end view of a ~cutting tool con structed in accordance ‘with the practice of 'the invention, and ' ‘Figure 2 is an elevation, partly in. section, of the drilling tool. Referring more particularly to the drawing, 20 25 designates a drill bit and 2| a shank through which the blows of a percussive element, such as a rock drill of the hammer type (not shown), are 30 - As a preferred form of construction, the rear ward end of the skirt 22 constitutes a seating surface 38 for a shoulder 39 on the shank 2| ad A furtheryobject is to simplify and cheapen'the 15 construction of devices‘ of this character. ‘20 portion 32 and a reduced portion 33 of which the former serves as a bearing for a pilot 34 on the transmitted to the cutting bit for actuating it. In the,form of the invention illustrated the cutting bit comprises a body portion or skirt 22 carrying ‘a plurality of cutting wings 23 at'its front end. Any suitable number of cutting wings 23, may be provided, four being shown in the pres 35 ent instance and arranged in cruciform fashion. Each cutting wing is provided with the usual crushing surfaces 24 which converge tov de?ne The shank 2| is hollow, having a passage 40 for conveying cleansing ?uid, as for example water or compressed air, or both, to a hole being drilled. The passage III also extends through the stem 28 '20 so that the cleansing ?uid is projected directly against the point at ‘which the cuttings are formed and without passing through channels other than that defined by the shank. , - In practice the present invention has been found to possess certain advantages that are 25 highly desirable in devices of this character.- By extending the stem 28 entirely through the drill bit, rather than form a water passage in the drill bit, the same volume of cleansing ?uid and 30 under the same pressure may be supplied to the work irrespective of whether a tight or loose joint exists between the drill bit and the shank. As a consequence an uninterrupted stream of undiminished force may be constantly‘ directed 35 against the work, thus eliminating the chances of the cuttings plugging up the outlet opening of radial cutting edges 25. The cutting wings 23 ex-v the passage. Moreover, by utilizing the portions tend beyond the periphery of the skirt 22, and the of the stem lying forwardly and rearwardly of 40 portions thus projecting are reenforced by'but tresses 26 extending longitudinally of the skirt 22. , In accordance with the practice of the inven tion, the skirt 22 is provided with a bore 21 ex 45 tending from end to end of the skirt to accommo date a stem 28 carried by the shank 2|. The stem 28 extends entirely through the bore 21 and its front surface 29 is of convex shape and coin-~ cides with partly circular surfaces 30 on the skirt 22 and forming the bottoms of grooves 3| which de?ne the side surfaces of the portions of the cutting wings lying vin the plane of the skirt and 55 the threads as pilots the bit will be restrained 40 from tilting with respect to the stem in the event that the bit becomes partly unthreaded and in‘ that way the threads will be protected against damage due to friction between the bit and the shank.. v , ‘ Preferably, the bore 21 consists ‘or an enlarged _ ' 45 ' A drilling tool, comprising a hollow body por tion, cutting wings on the body portion, a shank . extending through theibody portion, interlocking ' threads on ‘the shank and the body portion, pilot 50 portions on the shank forwardly and ‘rearwardly of the threads to engage the body portion, convex surfaces between the cutting wings, and a convex serve as outlets for the cuttings and the cleansing agent conveying the cuttings from'the bottom of — surface the hole being drilled. , vI claim: on the shank coinciding with the said convex surfaces. 66 nnwsnn r. TERRY.