Патент USA US2405748код для вставки
_'Aug._i3, 1946. 2,405,748 w. JOHNSON INTERNAL GRINDER Filed Oct. 18. 1944 > 2 Sheets-Sheet 1 Aug, 13, 1946. 2,405,748 w. ‘JOHNSON TlNTERNAL GRINDER 2 Sheets-Sheet 2 Filed Oct. 18, _1944 _ Mww’f L mm Schnson 2,405,748 Patented Aug. 13,1946 UNITED ‘STATES PATENT OFFICE Heights, Mich, as William Johnson, Muske gen J. Brickner and signor of one-third to Arthur one-third to Henry W. Kropf, Muskegon Heights, Mich. Application October 18, 1944, Serial No. 559,299 1 Claim. 1 vThis invention relates to a novel construction: of internal grinder. It is desirable in many cases to grind relatively small holes through pieces of material to exact size. This grinding operation is usually performed on hardened material and (01. 51-43) ' 2 the space between said parts 8 and 9, whereby turning the shaft 1 causes a change in position of the block 5 with respect to the head 2 as is evident. ' ' after a hole of approximate size has previously From the end of the block 5 opposite where the indexing wheel 9 is located curved arms I I extend which are adapted at‘ their outer ends to be been provided. The present invention is direct brought together in clamping engagement by ed to a very ef?cient and relatively simple in turning the screw l2 (Fig. 3) ._ An electric motor ternal grinder which may be applied to the ver 10 13 is mounted eccentrically on a ring l4 having tical spindle of a drill press or similar machine, an annular ledge to bear upon the arms H, and the part having the cylindrical hole therein to at the'under side a ring l5 (Fig. 4) may be de be ground being ?xed to the bed of the machine, tachably connected with the ring [4. The electric and the internal grinder as a unit moved up and motor is‘held within the ring M by a set screw down vertically so that the grinding wheel may 15 16. It passes through the ring l5 and at-its lower traverse the hole which is being ground. The end its shaft is equipped With a driving pulley ll. The ring l4 may be rotated for belt adjustment. construction which I have devised for this pur pose is sturdy, ef?cient and accurate in opera From the lower end of the block 5 a sleeve 18 tion, is readily adjusted for holes of different di extends downwardly. It is open at its side adja ameters and is in general simple, effective, dur 20 cent the pulley H as indicated at IS. A driving able, easily applied and removed and one with belt 20 passes around the driving pulley l1 and which the desired grinding operation may be very through said opening in the sleeve l8 to pass around a pulley 2| indicated in dotted lines in rapidly performed. An understanding of the invention may be had Fig. l. Said pulley is mounted at the upper end from the following description taken in connec of a shaft 23 which extends into the sleeve l8 and tion with the accompanying drawings, in which, 25 which as indicated in Fig. 2, is provided with suit Fig. 1 is an elevation of the internal grinder able bearings for the upper end of the said shaft 23 at the lower end of which a small‘ grinding unit of my invention. wheel 24 is secured. The grinding wheel is adapt Fig. 2 is a fragmentary elevation thereof taken at a side of Fig. 1. 30 ed to be entered into an opening 25 in the work Fig. 3 is a somewhat enlarged plan view, and 26 indicated in dotted lines in Fig. 1 for grinding Fig. 4 is an enlarged fragmentary vertical sec the inner surfaces of said opening. At the upper side of the head 2 a collar 21 of tional view. insulation material is located, through which the Like reference characters refer to like parts in spindle l passes, said collar rotating with the the different ?gures of the drawings. In the construction of the internal grinding 35 spindle. A cable 28 housing the wires of an electric circuit leading to the motor l3 extends unit a vertical spindle I at its lower end is per between the motor and said collar, and the cir manently secured to or formed integral with a cuit wires are connected to metallic rings 29 and head 2 which has parallel downwardly and out wardly inclined sides 3. A gib 4 is located against 40 30 (Fig. 4) located around the upper portion of said collar said rings being insulated from each one of ‘said sides 3 and a block 5 is slidably mount other. A housing member 3| is disposed around ed upon said head 2, having a suitably machined the spindle l and extends partly within the collar longitudinal recess for slidable engagement with so that the collar 21 may turnaround it, said one of said inclined sides 3 and the outer side of gib 4. This is conventional construction for ad 45 housing remaining in ?xed position when the spindle, the collar and the head 2 are turning iustment and When the block 5 has been ad about the vertical axis of the spindle. The hous iusted to any desired position it is secured in place by set screws at one side engaging with ing at one side hasa lateral extension 32. A ca ble 33 having circuit wires to carry electric cur the gib 4 as shown. The adjustment is accomplished by means of .rent from an electric main or other source of 50 supply leads to said lateral extension 32, the an internal threaded sleeve 6 (Fig. 4) connect ed with the head 2 into which an adjusting wires housed by said cable 33 having connections screw 1 is threaded, the shank of which near its to two binding posts 34 on the housing exten outer end is provided with a collar 8 spaced from ‘sion 32. The inner ends of said binding posts an outer index wheel or head 9. A plate l0 se contact the rings 29 and 39 respectively. cured to the outer end of the block 5 extends into 55 3 2,405,748 The vertical spindle I is adapted to be de tachably secured to and within a suitable driven socket 35 from the overhead head 36 (Fig. l) of a suitable machine tool such as a drill press or the like. The socket 35 is attached to a driven shaft which is rotated at a' relatively low speed, therefore the spindlewl, head 2 and theparts car ried thereon are turned at said low speed about the vertical axis of the spindle l, the motorv l3 ' ' turning in a circle about said axis. The motor in addition is driven at its regular speed of oper ation and drives the shaft 23 at the required high 7. speed for grinding. orbital movement of the grinding wheel 24 causes said wheel to cover the circumferential inner surface of said opening. The collector ring con struetion shown in Fig. 4 permits the supply of electric current to the motor [3 while said motor is moving in its circular path of movement about the of thespindle J. The construction is very‘practical and useful. The motor is readily accessible for installation, removal, repair and replacement. The construc tion is relatively simple, is very durable and has proven' in practice to be very effective. _‘ ‘_ v_ Depending upon the position ,ofthe adjust-V a I i 'Ijheinvention is de?ned in the appended claim able block 5 upon the head 2, the axis oil the 15 and 11s‘ to?be i considered comprehensive of all formsof structure coming within its scope. shaft 23 may be located‘ either indirect aline ment with the axis of spindle l or eccentrically thereof. When adjusted to be offset a shortdis tance, as shown in Fig. 1, the shaft 23 and the ‘ grinding ~ ‘ I claim:~ ' Améchanism as described comprising, a spin dle mounted to be rotated, a head on said spindle, guideways on said head extending perpendicular ‘ Wheel thereof; will be rotated about the 20 to the axis of the spindle, a supportingblock axis of said shaft 23 at high speed vandwillimove mountedon ‘said guideways, means ‘for adjust bodily in an orbit around an extension of the axis ing said block on said guideways, va ‘shaft rotat~ of the spindle I. Accordingly the grinding wheel ably mountedon said block having an axis paral 24 moving‘ in said circular orbit about Lth'e' axis lel tov theaxis of ‘the spindle, a relatively small of spindle I is carried around the inner. surface 25. pulley on said shaft, a grinding’ wheel’ on said of thehole 25 in the work 26. The hole-25>‘ may shaft,v a rotatable support oh said block spaced , be in a plate'or block or other ‘work which is laterally from‘ said shaft,‘ vmeans for clamping clamped to the table of the machine, to the driv said support in adjusted rotated positioman 'elec ing shaft of which the internal grinding unit of my invention is applied. The head 36 being ver—" '30 tric motor mounted with its shaft eccentric to the axis of said support, a relatively large pulley .tically adjustable in the machines to which this on said motor shaft and a belt extending‘ around . internal grinding unit, is applicable,‘ the grinding both of said pulleys. _ _‘ __ _ __ p - wheel 24 is movable vertically1to¢coverthe ver tical dimension of the opening 'at"25, while the - 'WILLIAM JOHNSON.