Патент USA US2404866код для вставки
July 30, 1946. ‘J. E. SHEUMAN FLOATING FPO-CL HOLDER Filed Oct. 5. 1944 [5/8 /67 PF‘ : .fg.,z. ' 2,404,866 Patented July 30, 1946 2,404,866 UNITED‘ STATES PATENT ‘OFFICE 2,404,866 FLOATING TOOLHOLDER James E. Sheuman, Waynesboro, Pa. Application October 3, 1944, Serial No. 557,009 5 Claims. 1 This invention relates to tool holders, and more particularly to ?oating tool holders for use with turret lathes, screw threading ma chines, drill presses, boring mills and the like, (Cl. 279-16) 2 misalignment and the ?at disc likewise compen sates for parallel misalignment. Further objects and advantages of my inven tion will be apparent from the following speci?ca tion taken in conjunction with the accompanying automatic or otherwise, in which it is desired to have the cutting tool follow the work and com drawing, wherein: pensate for a spindle out of alignment due to Figure 1 is a longitudinal section illustrating wear of bearings or errors in the tool shanks, and one application of the invention; regardless of whether the tool is used in Vertical, Fig. 2, a. longitudinal section illustrating a fur~ horizontal, or other positions, in order that ac 10 ther application of the invention; curate cutting operations may be accomplished by the tools. The invention is an improvement over the con structions disclosed in my prior patents, No. Fig. 3, a perspective of the driving pin; Fig. 4, an end elevation of said pin; and Fig. 5, a side elevation of a conical'disc or washer used in the structure of Fig. 1. 1,244,648, granted October 30, 1917, and No. 15 Referring to the drawing, the ?oating tool 1,450,822, granted April 3, 1923. holder may be the straight shank type, as shown in In the ?rst of these patents the pin through Fig. 1, or of the shouldered type, as shown in which one member is driven from the other en Fig. 2. The straight shank type of holder mini gages only one of the diametrically opposed walls mizes over-hang of the tools, it allows unob of the bushing due to the shifting of the shank 20 structed penetration of a turret, and is especially eccentrically of the bushing or driving member, effective on machines where forward movement of and this produces undue wear. In the latter the carriage is constant in all positions of a patent while the structure is improved, neverthe turret. The absence of shoulders allows closer less due to the fact that the driving pin is angular grouping of the spindles on multiple spindle ma at the point of contact there is not the broad, 25 chines, while a shouldered shank holder is solid, driving engagement desired. Also, there adapted for heavier work. are other features which the present invention As shown in Fig. 1, an outer bushing or driving seeks to improve. member l0 has ?tted loosely therein an inner It is an object of the invention to provide two shank or driven member I l , there being a limited types of ?oating tool holders which permit the 30 play or relative movement between the two parts wide use of standard tools, one type having a in order that the tool carried by the driven straight shank holder without shoulders, and member Il may be centered during the cutting the other type having a shouldered holder for operation when it is in contact with the work. heavier work. ‘ In order to provide for the end thrust between A further object of the invention is to provide 35 the driving and driven members, as well as to a ?oating tool holder which will allow sufficient reduce friction to allow the driven member to move relative to the driving member for the movement to compensate for inequalities, or de ?ciencies of alignment as well as one of simple, centering effect, a ball bearing I2 is provided durable, eilicient and more satisfactory in con~ between the ends of the driving and driven mem struction. . Another object of the invention is to provide in a ?oating tool holder a drive between the shank and the bushing which consists of a. driv 40 bers, a ?at washer l3 being disposed against the bottom of the socket in the outer driving mem her so that the ball bearing rolls against it. On the opposite side of the ball bearing is a washer M having a conical face on one side in engage ing pin with eccentric end portions which are 45 ment with the bearing and a ?at face on its relatively broad for solid contact with the open other side whic his engaged by the ?at end of ings with which the eccentric portions of the pin the inner shank or driven member I l. Thus the engage in the bushing, the pin having a rotating axial pressure or thrust between the driving instead of a sliding action, and also contacting member and the driven member will be taken up the driving member the width of the wall instead 5,0 by the parts just described. of having a mere angular contact therewith. In order to provide the necessary connection A further object of the invention is to provide between the driving and the driven members, so a ?oating tool holder with friction minimized in that the driven member will be caused to rotate which the rolling or swivelling action of the con with the driving member, the transverse opening ical disc over the balls compensates for angular . 55 . I5 is provided in the driven member and a cor 2,404,866 3 It will be ‘obvious to those skilled in the art that various changes may be made in the in vention without departing from the spirit and driving pin I‘! with eccentric end portions 13, scope thereof and therefore the invention is not providing an improved driving connection be limited by that which is shown in the drawing tween the driving and driven members and af and described in the speci?cation but only as fording a broad, solid, contact between the pin indicated in the appended claims. and the openings [6 in the bushing. The pin is What is claimed is: adapted to rotate instead of slide as in my previ l. A too1 holder comprising a bushing, a tool ous constructions, and also, there is contact be tween thepin and the bushing or driving mem 10 carrying member having a shank ?tting loosely responding pair of openings It in the driving member. In these openings there is disposed a therein, said bushing and tool carrying member having registering transverse apertures, a pin ber the thickness of the wall instead of a mere angular or line contact. having an intermediate portion and one or more The driving pin I1 is provided with a slot IQ eccentric end portions which portions are adapted for the reception of a set screw disposed at right angles to the driving pin for limiting its axial .15 to have arelatively large surface engagement with or endwise movement. said registering apertures, said pin being adapted Thus with the structure described and ‘illus trated in Fig. 1, angular misalignment is accom to rotate and maintain a driving connection be conical disc l4 over the'balls, allowing the shank ing a curved surface to the bearing, said curved tween said bushing and said tool carrying mem ber, a thrust bearing between said bushing and modated. The arrangement of parts simpli?es the proper alignment of the tool carried by the 20 tool carrying member, a Washer on each side of said bearing, one of said washers presenting a shank ll. Angular misalignment is accommo flat surface to the bearing and the other present dated by the rolling or swivelling action of the and ?at surfaces permitting rolling and swivelling to tilt easily. Likewise, parallel misalignment or lateral movement of the shank is easily ac 25 action of the tool carrying member in said bush ing, the eccentric portions of said pin and the commodated by the ball bearing moving on the walls de?ning the openings in the bushing pro adjacent surface of the disc l3. The washer it viding relative large contact between the pin and has ?at sides. A positive drive is maintained the bushing. between the shank and the bushing by the driv 2. A tool holder‘comprising a bushing, a tool ing pin and its eccentric relatively broad flat end 30 portions, the pin rotating to maintain such posi carrying member having a shank ?tting loosely tive connection. The construction shown in Fig. 1 is a straight in said bushing to allow the tool to swivel or move laterally to align with work, said bushing and tool carrying member having registering transverse construction shown in Fig. 2 is a shoulder type 35 apertures, a driving pin located in said apertures shankholder for tapered shank tools, while the and having one or more eccentric end portions , offset with respect to each other for engagement Referring to Fig. 2, an outer bushing or driv with the corresponding surfaces of said register ing member l0’ has loosely ?tted therein an inner ing apertures, a thrust bearing between said bush shank or driven member I l’. The relative move ment or play between the outer bushing or driven 40 ing and tool carrying member serving to mount said tool carrying member in said bushing, and member and the inner shank permits the tool surfaces in association with said bushing and said carried by the inner shank to center or align holder for tapered shank tools. tool carrying member presented to said bearing to allow the tool carrying member to freely swivel with the work during the cutting operation while it is in contact with the work. The drive be tween the outer bushingand the inner shank is identical to that of the structure of Fig. 1, the and move laterally for alignment of the tool with work. ' 3. In combination with a bushing of a shank mounted for movement in said bushing so that a tool held by the shank may follow the move with an enlargedhead 20 and the inner shank 50 ment of work, an annular bearing for receiving the end thrust of said shank in said bushing, and is provided with an enlarged head 2|. The en said shank presenting a curved surface to said larged head 20 is adapted to receive an assembly outer bushing having aligned apertures 46’ to accommodate the eccentric portions l5 of the driving pin ll. The outer bushing It’ is provided bearing to facilitate swiveling of the shank, said for performing the functions of the assembly be bushing and shank having registering transverse tween the end of the shank and the bushing in Fig. 1 such assembly comprising a ?at washer 55 apertures with relatively large surface areas, a driving pin located in said apertures and having l3’ and a conical washer 22. Thus the bearings relatively large surface areas for engagement with and the flat conical washers of the constructions said apertures, one or more of the end portions of of both Figs. 1 and 2 compensate for angular and said driving pin being disposed eccentrically of parallel misalignment. Angular misalignment is corrected by the action of the conical disc rolling 60 the intermediate portion thereof. 4. In combination a bushing, a tool holder hav or swivelling over the ball bearings, thus keeping ing a shank loosely mounted in said bushing to the shank or socket parallel to the ?at or front allow a tool to align with the work, said bushing face of the disc or washer at all times. Paralleled and shank having transverse apertures, a driving misalignment is corrected by lateral movement of the shank which readily'follows on account 65 pin located in said apertures and having a por tion offset from another portion of said pin, a of the bearing rolling over the ?at face of the friction reducing roller thrust bearing between ?at washer l3’. At the same time the driving said bushing and said tool holder, and surfaces pin will rotate and maintain the driving connec in association with said bushing-and too1 carrying tion. The washer 24 is fastened to the shank or driven member H’ for the purpose of holding 70 member presented to said bearing to .allow the tool carrying member to freely move for ,align the tool in place when withdrawing the tool ment of the tool with the work, said surfaces from the work. being ?at at one side and arched at the other From the foregoing it will be readily under side of the bearing. , _ stood that a, simple yet improved construction is provided. 75 5. In combination a bushing, a tool holder hav 2,404, 866 5 ing a shank loosely mounted in said bushing to allow a tool held by said holder to align with the work, said bushing and shank having transverse apertures, a driving pin located in said apertures ing and said tool holder, and surfaces in associ ation with said bushing and tool carrying member presented to said bearing to allow the tool carry ing member to freely move for alignment of the and having a portion offset from another portion tool with the work. 6 of said pin, a thrust bearing between said bush JAMES E. SHEUMAN.