Патент USA US2124757код для вставки
July’ 26, 1938. w_ VAUGHAN‘ 2,124,757 PISTON RING GROOVE CLEANER Filed June 1, 1956 fswém INVENTOR. W'ILLIAM‘ VAUGHAN F76- _ 6 - BY Caz/own m ATTORNEYS Patented July 26, 1938 2,124,757 UNITED STATES PATENT OFFI€E 2,124,757 PISTON RING GROOVE CLEANER William Vaughan, Lapeer, Mich., assignor of one half to Aircraft Specialties, Inc., Lapeer, Mich., a corporation of Delaware Application June 1, 1936, Serial No. 82,964 3 Claims. The present invention relates to piston ring groove tools and has particular reference to that type of tool which is adapted to be used for both removing incrustations of carbon and deepening Cl the normal depth of the grooves. An important object of the invention is to provide a device of the foregoing type which is of simple and durable construction and which can be manufactured very inexpensively on a 10 large commercial scale by modern mass produc tion methods. Another object of equal importance is to pro vide a device of the foregoing type having a rel atively low maintenance cost. The invention contemplates certain features of construction, combinations and arrangements of elements novel to this art whereby certain im portant and well-de?ned advantages are ob tained. Among said advantages may be men tioned the following: The device is readily adjustable to operate on pistons of widely varying diameters. The device is readily adjustable to clean or deepen grooves of different widths. The cutter element is pressed against the groove with uniform working pressure, thus pro viding a non-gouging and non-chattering action such as is essential in order to obtain a smooth and clean surface. 7 and inoperative positions relative to- the piston to be operated upon, the parts in their inoper ative position being indicated by dot and dash lines; Figure 2 is a plan view corresponding to Fig ure 1; Figure 3 is a cross-section taken on line 3—3 of Figure 1; Figure 4 is a cross-section taken on line 4-4 of Figure 1; of Figure 1; Figure 6 is a View in perspective of the spring for urging the tool holder toward the forward end of the device; Figure 7 is a view in perspective of the cutter element and the screw for pivotally mounting it upon the tool holder; and Figure 8 is a view in perspective of the locking means for the cutter element. a thin bar I of substantially rectangular cross section. The forward end 2 of the bar is bent back upon itself as shown to provide means for engaging pistons of different diameters at two spaced points. The main portion of the bar is straight to provide a guide for the slidable mem ber 3 as well as a convenient handle 4 for the sideways is totally eliminated, thus entirely ob tangular cross-section and serves a purpose to be hereinafter pointed out. The portion 1 is U shaped in cross-section and as will be hereinafter pointed out serves as a mounting for the tool holder. The slidable member 3 may advanta geously be made out of a single blank, the rivets 8 serving to hold the formed blank together. Means may be provided to lock the slidable member against movement at any desired point along the main portion of the bar I. The means The number of exposed or protruding cutter teeth is reduced to a minimum. ' The cutter element is readily removable for resharpening or replacement. The tendency of the operative cutting tooth to drop into the oil holes is entirely eliminated. Other objects and advantages will appear as the description proceeds. The inventive concept underlying the inven tion is adapted to be embodied in various physi 50 cal forms, one of which is illustrated in the ac companying drawing. Referring briefly to the drawing, Figure 1 is an elevation of the illustrative em bodiment of the invention, showing the cutter 55 element and its associated parts in both operative 20 Referring now to the drawing in greater de tail, it will be noted that the device comprises device. grooves or cutting the bottom of the grooves at an angle. 10 Figure 5 is a cross-section taken on line 5-—5 Proper cutter pressure is readily and automati cally obtained, regardless of the diameter of the piston upon which the device is being used. Additional cutter pressure may be very easily obtained. The tendency of the cutter element to swing viating the danger of damaging the side of the 40 (01. 82-4) 30 The slidable member 3 consists of a lower por tion 5 which is of hollow rectangular cross-sec tion to‘ serve as a guide-way to enable the mem ber to slide along the bar I, and the two upper portions 6 and l. The portion 6 is of hollow rec may consist of a slot 9 in one side of the slidable member and a screw II] which is threadably con nected to the side of the bar I through the slot 9. The screw has the milled head I I, the screw thread l2 and the enlarged shank 13. When I the screw is tightened, the annular shoulder be tween the shank l3 and the threads l2 presses against the edges of the slot 9 and clamps the slidable member against movement. The tool holder is designated as I4 and is piv 55 2,124,757 2 otally mounted by means of the pivot pin I5 at the forward end of the U-shaped portion 1 of the slidable element 3. The tool holder comprises the two spaced walls I6 and I1 and the connecting wall l8, and is normally urged about its pivotal point toward the forward end of the tool by means of the spring IS. The holder may advantageously be made out of a single blank of suitable material. The spring I9 which is shown separately in Fig 10 ure 6 is formed of a thin strip of resilient metal and has the slightly arched main portion 20 and the bent back portion 2|. The bent back portion diameters. The cutter element 24 is turned about its pivot to present the required sized cutter tooth toward the piston and the cutter element is locked in position. The slidable element is moved toward the piston until the operative tooth is received within the groove to be operated upon. Then the slidable element is locked in position by means of the screw H]. To operate the device it is merely necessary to turn the piston against the cutter or to rotate the device around the piston. The 10 construction of the device is such that the cutter element is pressed against the groove with uni form working pressure, proper cutter pressure be ing automatically obtained regardless of the di ameter of the piston. Additional cutting pressure 15 may be readily supplied if considered necessary terminates in the small upwardly facing recess 22. As shown in Figure l the spring I9 is disposed 15 with its main portion 20 lyingv on the floor of the two portions 6 and 1 of the slidable member 3, the bent back portion 2| being bent about the ' or desirable by exerting a slight pressure upon pivot pin l5 and the recess 22 engaging the bot— the connecting wall I8 of the tool holder with tom of the connecting wall l8 of the tool holder. the thumb of the hand used to hold the device. It is thought to be clear that the manner in 20 It will be noted that the two upper portions 6 and ‘I of the slidable member serve asta housing for which the cutter element is mounted entirely eliminates any tendency of the cutter element to the spring_ ' Rotatively mounted on the upper end of the swing sideways. Hence, the danger of damaging tool holder about a horizontal axis by means of the side of the grooves or cutting the bottoms of the screw 23 is the cutter element 24'. These two the grooves at an angle is entirely eliminated. It elements are shown separately in Figure 7. The is also to be noted that the operative cutter tooth passes readily over the oil holes instead of drop cutter element has a hub 25 which may advan tageously be of cylindrical form, and‘ is provided ping into them as in prior devices. The foregoing embodies the essential and dis with a plurality of. cutter teeth 26, 2'1, 28 and 29 tinctive thought of my invention, but it will, of ~ 30 of different thicknesses to adapt the tool for use with grooves of different. thicknesses. As clearly course, be understood that the same may be com shown in Figure 1 any one of the cutter teeth bined with other features without affecting the may be brought into operative. relationship to the peculiar results obtained and that various changes piston P which is disposed at the bent end 2' of and modi?cations may be resorted to as to details the bar I. The piston engaging portions of the without departing from the spirit and scope of my invention. bar enter into the groove to be cleaned and coop I claim: erate with the operative cutter tooth- to clamp 1. A piston ring groove cleaner and deepener the piston in position. After the desired tooth is brought into operative positionv the cutter element comprising a straight bar bent back upon itself may be locked against‘ movement by tightening at one end to provide means for engaging pistons 40 the screw 23. ' ' of widely varying diameters at two spaced points, itive locking means for the cutter element. The locking means 30 is separately shown in Figure a cutter element mounted on said bar for both slidable and pivotal movement to and away from the bent end of said bar and spring means urging said cutter element about its pivotal point toward 8 as consisting of a solid block of metal of rec the bent end of said bar. In the illustrative embodiment of the invention the device is shown as being provided with a pos ' tangular cross-section having a curved upper 2. A piston ring groove cleaner and deepener portion 3|, a cut off corner 32 and a screw thread comprising a straight bar bent back upon itself at one end to provide means for engaging pistons of widely varying diameters at two spaced points, ; ed aperture 33‘. The block 36 is adapted for slid able movement between the two walls [6 and ll of the tool holder 14 and. may be moved up in the space between two teeth of the cutter element to lock the cutter element against rotative move ment. In order that the block may be easily moved to and from locking position the wall‘ 16 is provided with a slot 34 to receive a screw 35 which a slidable member mounted on said bar for move ment toward and away from the bent end of said bar, a cutter element, means for mounting said cutter element on said slidable member for piv otal movement toward and away from the bent end of said bar and spring means for urging said into locking position by means of the screw 35 cutter element about its pivotal point toward the bent end of said bar. 3. A piston ring groove cleaner and deepener comprising a straight bar bent back upon itself 3 at one end to provide means for engaging pistons and then locked against displacement by tighten of widely varying diameters at two spaced points, is threadably connected with the block 30 by means of its aperture 33. The screw is of substan tially the same form and construction as the screw l0 previously described. The block may be moved ing the screw. It is thought that the operation of the device will be readily understood from the drawing and the foregoing description. Suffice it to say that the piston P to be operated upon is positioned as shown in Figures 1 and 2 with the two piston engaging portions of the bar I engaging in the groove to be cleaned or deepened. Obviously the 70 bent end 2 will receive pistons of widely Varying a tool holder mounted on said bar for both slid able and pivotal movement to and away from the bent end of said bar and a cutter element pro vided with a plurality of cutter teeth and rotat ably mounted on said tool holder so as to present any desired one of said teeth in operative rela tion to the piston. WILLIAM VAUGHAN.