Патент USA US2132503код для вставки
'Oct’. 11, 1938° E. E. WELCH _ 2,132,503 ' MILLING AND PARALLELING MACHINE Filed Aug. 18, 1957 2 Sheets-Sheet l 24' INVENTOR. .EYY/YUETE. Wm A TTORNE Y. 0¢t.11,193s. _ EEWELCH * ' 2,132,503 MILLING AND PARALLELING MACHINE Filed Aug- 18, 1957 . ‘ 2 Sheets-Sheet 2 INVENTOR. EfU/QETJZZ ZIAZZG‘J my a. @%4w. .4 TTORNE Y. ’ Patented Oct. 11, 1938 ' ‘ 2,133,503 MILLING ANDPARALLELINGMAGHINE" '' 3' _ v ' " ‘ I A 1Asturias“;Auguste, 1537‘; Serial No. 159,676 T Y’ ' ' ' ' 1 (01.. My invention relates toal milling andlparallel ing‘m'achinel ~ ' _ vEmmet If]; WeIchJTopeka, Karis'. ' ' r ‘a ' ‘ ' The object of my inventioniiislto-p "ovid’e a1 mill‘ ing‘xand'parallelingimachine, primarily for use in the preparation of dental bridges, comprising a 90-21) ' " ' wise rotation of'the'locking wheelll‘ii,untill'it'is'in ?rmicontact with the bearing t3: provides a brake’ to set the; carriage 9'a'gainstjmovementg , The seat '19‘ is‘slideablyunounted- on the" rails It and I l. The shaft 20 is carried in they-bearings rotating bit mounted above a seat arranged for 2i and 22 on the lower side of the seat member. movement in a' plane normal to the axis of the bit. vA driving wheel 23 is af?xed at one end of the A further object of my invention is to provide a shaft and a locking wheel 24 at the other end in machine of the kind described in which the move ' threaded engagement with the shaft. The pinion 25 is?rmly affixed to the shaft 20 at its mid point 10 10 ment of the seat can be accomplished in two and engages the rack 26, set in the ?oor of the directions precisely at ninety degrees. These and other objects will. hereinafter be carriage at D. Rotation of the driving wheel 23 ' in which like characters apply to like parts in the Clock wise rotation of the locking wheel 24 will set the different views: seat against movement. more fully explained. Referring tothe drawings ' I r ' moves the seat along the guides l0 and I I. _ An arm 21 is rigidly connected to the top of the Figure 1~is an elevation of the machine showing post 2 and extends therefrom to a point approxi- J an adjustable base carrying a casting, posi ‘mately over the center of the base I. The free tioned in the seat. Figure 2 is a plan view of Figure 1 with the tool end of the arm 27 is bored at E to receive the ' sleeve 28. A cut at F allows the positioning of iii) post shown in section. Figure 3 is a fragmentary plan View showing the pinion gear 29, which is ‘mounted on the shaft 30. A slot at G extends from the cut F along the the bit mechanism and adjustments. Figure 4 is an enlarged section taken on the 'arm 21. The shaft 30 is rotatably positioned in the arm 21. The driving-wheel 3| rigidly affixed line 4-4 in Figure 2. V Figure 5 is a fragmentary view of one end of to one end of the shaft 36 serves to rotate the the carriage showing the driving and locking pinion gear 29, which engageslthe rack32 set in means. the sleeve 28 and raises or lowers the said sleeve. , Figure 6 is an enlarged plan view of the seat. Figure 7 is an enlarged view of the chuck and bit with respect to the work. " ' i The machine described has a bed plate I, upon _ which are mounted a tool post 2 and four rail posts 3, 4, 5 and 6 respectively. A guide rail 1, is supported between the posts ligand 4 and a similar 2:) Cl guide rail 8 is supported between the posts 5 and 6. The rail 8 is parallel to the rail 7. A rack 'l' is affixed to the rail 1 and similarly a rack 8’ is af?xed to the rail 8 in such a manner as to allow the teeth of the racks‘ to extend below the lower 40 surfaces of the respective rails. The carriage 9 is The locking wheel 33 is engaged on the threaded end of the shaft 34. Clockwise rotation of the locking wheel 33 will distort the arm 27 at the slot G to prevent movement of the sleeve 28. A spindle 35 is rotatably mounted in the sleeve 28. The upper extremity of the spindle has the con nection 36, to- which may beattached a drive, preferably the chuck of a dental drill. A chuck 31 is positioned at the lower end of the spindle and arranged to hold a bit 38. Figure 7 illustrates the use of a side cutting or milling bit 38 as applied to the inlay at H. The use of the machine herein described is 4 O primarily that of making precision cuts in the slideably mounted on the rails 1 and 8 as shown at A and B. The guide rails Ill and I! are sup form of slots or grooves in dental gold inlays, ported in the endsv of the carriage and are paral three-quarter gold crowns, full gold crowns, and the like which have been previously ?tted to the lel to each other. The rails l0 and II are posi teeth in the mouth of a patient, and transferred 8. The plane of the rails l0 and II is parallel to ' to a metal die or cast of the jaw constructed from I an impression of said jaw. These inlays are that of the rails '! and 8. The shaft I2, trun nioned in the bearings l3 and I4 at each end of intended for attachments to abutment teeth to ~ tioned in a direction 90 degrees to the rails 1 and support precision removable dental bridges. The proper operation of removable bridges depends on the precision of the cuts made in the abutment ' A pinion gear I‘! is mounted on the shaft [2 and "inlays. These cuts must be perpendicular to the the carriage 9 has a driving wheel at one end and adjacent thereto a locking wheel l6 which en gages the threaded portion of the shaft l2 at C‘. engages the rack 8'. A similar gear l8 engages» the rack ‘I’. Rotation of the driving wheel i5 55 moves the carriage on the rails l and 8. A clock same plane and in many cases one vcut may re-. quire another cut at exactly 90 degrees from the ?rst, This machine provides the movements 2 2,132,503 necessary to prepare the required work in that the seat must remain continuously in the same plane and at times move in two de?nite directions at 90 degrees. The arrangement illustrated and de scribed provides the means of movement with the conservation of height. The seat is designed preferably to accommodate an adjustable base as illustrated, however I do not con?ne myself to such a base speci?cally. 10 ‘ In operation, the base is placed in the seat with the work turned to the most convenient position. The set screws 39 are rotated to clamp the said base. The work is then positioned under the bit 38 by rotation of the Wheels l5 and 23. The bit 15 is raised or lowered by the wheel 3| and then clamped in position by the locking wheel 33. If the direction of the out is along the rails l0 and II, the locking wheel [6 is rotated to clamp the, carriage and the work is fed against the bit by 20 rotation of the wheel 23. If the direction of the cut is along the rails ‘I and 8, the seat is clamped by the rotation of the wheel 24 and the work is fed against the bit by the rotation of the wheel Hi. The machine herein described provides a de? nite guide for the machining and milling required in the preparation of removable dental bridges and such modi?cations may be employed as lie within the scope of the appended claim and what I claim as new and desire to secure by Letters Patent is; A milling and parallelingmachine comprising a carriage, a base and a seat, the said carriage slide ably positioned on guides‘, the said guides sus- ' pended above the base on posts, the said seat 10 slideably positioned on a second set of guides, the said second set of guides positioned on the car riage at right angles to and’ below the ?rst set of guides, racks affixed to the ?rstfset of guides, pinions rotatably mounted on the carriage and in 15 engagement with the rack on the ?rst set of guides, a second rack positioned on the carriage and a pinion rotatably mounted on the seat and in engagement with the said second rack, wheels as means to drive the said pinions and other 20 wheels as means‘to lock the said pinions, a bit rotatably mounted on the base and vertically adjusted to the seat. ' EMMET E. WELCH. '