US2686992A - Combination spindle machine - Google Patents

Description

E. T. KINDT ET AL COMBINATION SPINDLE MACHINE Aug. 24, 1954 3 Sheets-Sheet 1 Filed Jan. 20, 1951 & T D mw K E T r m E ATTOENEYS m. w R A.

Aug. 24, 1954 E. 'r. KINDT ET AL COMBINAT ION SPINDLE MACHINE Filed Jan. 20, 1951 3 Sheets-Sheet 2 IN VEN T 0R5 Z' K/NDT A TI'OENEYS lEA A E/MM irllllllll. E

s- 4, 1954 E. T. KINDT ETAL 2,686,992

COMBINATION SPINDLE MACHINE Filed Jan. 20, 1951 3 Sheets-Sheet 3 IE A2 [L BY A IMM A ITOENEKS Patented Aug. 24, 1954 Ernest T. Kindt and Ira A.

Rimmel, Lakewood,

* Ohio, assignorsto The Kindt-Collins Company,

-Glevelandflhio, a corporation ofOhio ApplicationJanuary 20, 1951, 'Serial No. 207,034

This invention relates towahrading machines and more particularly to. sanding machines known commonly as spindle-type machines which employ an .abrading element in thegeneral form of a shaftor drum. The preferred form of a the machine comprises a horizontal work table from which the abrad-ing element projects. The

abrading spindle and driving motor are. mounted l on a carriage which may be swungabout.an axis in the plane of. thetable to vary the inclination of the spindle tothe table. The machine accord- 111g to the. invention involves new combinations of structural elements which have improved operating characteristicsand constitutes an improvement upon the structure in theicopending application of Ernest T. Kindt. and Ira A. Rimmel, Serial No. 123,432, filed October 25; 1949.

One of the objects of this invention is to provide a spindle-type abradingmachine wherein the spindle is. mounted in" a housing which is reciprocated by a separate prime mover.

Another. object of the invention is to provide a spindle-type abrading machine with an oiling system whichfunctions as thespindle rotatesand supplies the necessary lubricant therefor.

A still further object ofthe invention is to provide the spindle of the abrading machine with a housing containing the bearings and the oiling system therefor, the housing being reciprocated,

thus providin a unitary and dust-tight structure.

Another object of the invention is to provide a protective system for controlling the spindle speed as determined by the size of the abrading shaft or drum-installed for operation.

Other objects of this invention will appear as the description of the preferred embodiment of this invention progresses.

In the drawings:

Fig. 1 is a front elevational view of the sanding machine'with parts cut away to show details of construction;

"Fig. '2 is a side'elevational view with the side of the cabinet'cutaway to show the driving than the normal speed of motor 2|.

1 Claim. (01. 51-72) metal reinforced by angle iron stiifeners l2 at the corners. The casing ll provides a shield for the working parts of the machine and anenclosed chamber into which dust from the sanding operation is drawniwhen themachine is in operation. The sanding operation is affected by Cylindrical abrasive elementsinot shown) which may be of various diameters and lengths and which may be held in a chuck H3 at the upper end of a motor driven spindle it. The spindle issupported in a quill l5 and is driven by an electric motor 16. The quill I 5 is mounted for vertical reciprocation in a supporting frame ll, bearings lfiibeing provided therebetween for wear and ease of operation. The frame 5 l is mounted for arcuate movement in slides it. The center ofrotation. as a result of movement in slides I9 is at the point of intersection of the centerline of spindle M, and thetop surface of table ill. The angular position of spindle I 4 is determined and varied by rotation of handwheel 20 located outside of casing l I.

A second electric motor is mounted on frame I! and has a conventional gear reduction, 22 affixed thereto. Adrive shaft 23', extending from gear reduction 22, rotates at a speed considerably less A coupling 2 is keyed to shaft 23 'andhas an eccentrically locatedstub shaft 25 mounted on the end thereof. Shaft 25 travels in a circle about the centerline of shaft 23. A lateral channel 26 is formed in the outer wall of quill l 5 and has its upper and lower walls in parallel relationship. A bearing block 21 is disposed for lateral sliding movement in channel 26 when coupling 24. is rotated and stub shaft 25 which engages block 2'! follows the predetermined circular path. A ball bearing 28 intermediate stub shaft 25 and bearing block 21 reduces the friction between these two members during operation. It can be seen therefore that as motor 2! rotates; stub shaft 25 will be driven in a circular path thus producing vertical reciprocation of 011111115. The provision of bearing block fl is desirable in the conversion of rotative movement to reciprocative movement. Spindle It has a belt pulley 29 mounted thereon immediately above quill f5 and is releasably affixed thereto by setscrew 3-0. A belt 3| is trained over pulley 29 and a drive pulley 32 mounted on the. drive shaft of motor I6. Adjusting bolt '33 moves motor l6 toward and away from spindle I4 thereby tightening the belt 31 as required. Freedom of movement of motor E6 is provided by the hingetype support resulting from the use of pin 34 in shiftable engagement; with: the frame II? and the base of motor l6.

The details of construction of quill 15 are illustrated in Fig. 3. The spindle M is carried for rotative movement along the medial axis of quill l5 by a pair of ball bearings located near the upper end of quill l5. A shoulder 36 formed in the inner wall of quill holds bearings 35 against move ment in a downward direction. A cap 31, having an openin formed therein for spindle I5, is affixed to the upper end of quill 85 by a plurality of cap screws 38. The cap 31 has a down-turned fiange 39 which abuts against the uppermost bearing 35 and holds the assembly in rigid en gagement with shoulder 35.

Lubrication for the top bearings 35 is provided by oil forcibly pumped through a passage it formed in the wall of quill 15 extending the full length thereof. At the uppermost end of the passage 40, an aperture M is formed in the inner wall of quill l5 between the passage ill and the space surrounding the uppermost portion of bearing 35 and defined by the normally curved form provided on the end portions of the outer race. A plurality of notches 42 are formed in the flange 39 and operate as leakage ports and distributing means for allowing the lubricant to pass into the bearings uniformly distributed around the periphery thereof.

A plurality of slingers 43 are formed on spindle it immediately above bearing 35 and throw the lubricant therefrom, thus preventing the flow of oil along spindle i4 and outside quill IS. A down-turned ring 45 located on cap 31 in the cavity immediately above the bearing 35 receives the oil thrown from slingers 43 and causes it to drop on the moving elements of bearing 35.

A lock nut 45 is threadably engaged on spindle M for holding the inner races of bearings 35 in a fixed relationship with spindle Ill by clamping said inner races against the shoulder 46 formed immediately below the slingers 33. A washer 4! is provided between lock nut 55 and the inner race of the lowermost bearing 35 to facilitate the tightening of nut 45 to hold the bearings fixed to the spindle I l. A shim 48 is located between the outer race of bearings 35 and a shoulder 35. The thickness of shim 48 may be adjusted, thus obtaining the proper dimension for bringing the flange 39 of cap 3'! into tight engagement with the outer race of the uppermost bearing 35 as screws 38 tighten cap 31 into closing engagement with the upper end of quill i5. Thus, the rigid mounting of the outer races to the quill and the inner races to the spindle provides a means of restraining the spindle M against movement longitudinally of the quill while rotating freely in the bearings.

A second pair of bearings is disposed intermediate quill l5and the lower end of spindle l4 and have the inner races thereof rigidly mounted to spindle M by the action of lock nut 50, applying compressive stress to the inner races of bearings 53 and forcing them against shoulder l5 on spindle I4.

The lower end of quill I5 is closed by a cap 52 which is held in position by a plurality of cap screws 53. Cap 52 serves the purpose of providing a closure means for the quill and a reservoir for lubricating oil. An annular well 55 is formed in the cap 52 for receiving a quantity of oil and to act as a settling basin for sediment which may accumulate. A pump rotor 55 on the lowermost end of spindle l4 consists of a helical thread on a cylindrical projetting portion of spindle M. The pump rotor 4 55 rotates in a cylinder 56 formed centrally in cap 52 having an inlet 51 adjacent the uppermost end of the rotor 55. An outlet passage 58 extends horizontally from the lowermost end of cylinder 53 and. connects the pump through the connecting passage 59 to oil passage 45 extending to the upper end of quill l5. Rotation of spindle It and rotor 55 causes oil to be drawn from the reservoir in the quill l5 and forces it through passages 58, 59, and 40 to the uppermost end of quill l5 whereupon it returns by gravity through the bearings to the reservoir. A shroud fill surrounds the portion of the spindle immediately above the pump rotor 55 and has clear space therebetween. The shroud 50 prevents the centrifugal pumping action of the shaft on the pool of oil in the reservoir, thus improving the efficiency of pump 55. In the absence of such a member, the oil would be thrown away from the inlet location and starving of the pump would result. A drain for cylinder 55 and passages 55, 53, and 45 is closed by a conventional pipe plug 5!.

A filler for access in replenishing the supply of oil in the reservoir is connected to the cap 52 at the lowermost portion of the well 54. A length of pipe extending laterally therefrom has a T-connection 63 on the end thereof which carries a sight glass fi l having a hinged cover 55 thereon. A fill line 56 on sight glass 54 indicates the proper quantity of lubricant required to bring the level thereof to the operating point within quill l5. A drain for well 55 is provided by the removal of plug 5'! from the lowermost connection on T 63. It may be noted that the filling arrangement moves along a path of travel as the quill i5 is reciprocated by the motor 2i.

A protective device which functions with the machine to provide safety of operation when using abrasives of different diameters is provided in the form of an automatic switch control which governs the speed of motor It as a function of the size of the abrading elements installed on spindle M. A lever 55 is pivotally mounted to table top H by a bolt 53. A finger l5 projecting vertically from lever 58 is in position for engagement with an abrading fixture to be mounted on the spindle it. A slot ll limits the angular motion of lever 68 to two positions one of which being the position which will allow the average small size fixture as designated by broken line 12 to be mounted on'the spindle. When lever 58 is moved to the opposite end of its path of travel, an abrading fixture designated by the broken line 13 may be placed in operating position. The motion of lever 58 between these two positions is transmitted to a switch control 14 by a flexible wire cable 15 which is joined to the lever 58 intermediate shoulder 69 and slot 1!. The opposite end of 'cable 15 is joined to an arm 15 which is operably connected to switch control M thereby obtaining an inter-connection between switch control 74 and the finger ill. The switch control 73 operates a two-position electrical switch which functions in the electrical circuit of motor [5 to provide two speeds of operation. The position of the lever shown in solid lines in Fig. 4 will therefore allow high speed operation of the spindle. Movement of lever 58 to the broken line position in Fig. 4 which would be required by the installation of a large size abrading element will cause switch control 14 to be moved into the low speed position. Damage to the machine and injury to the operators is prevented by the functioning of this assembly.

A belt guard 11 afiixed to the table top I is disposed to protect pulleys 29 and 32 and belt 3| from direct impingement of dust which results from the operation of the machine. A plurality of filler plates 18 having various sized openings may be disposed in table top I6 for use with abrasive elements of dififerent diameters. A plate I8 may be selected which will clear the abrasive and also support the material brought into contact therewith.

With a suitable abrasive element mounted in chuck I3 on spindle I 4 and the proper plate I8 in position, energization of motor I6 will cause the spindle I4 to rotate. The speed of rotation of spindle I4 will be determined by the position of switch control 74. If the abrasive element is of relatively large diameter, it is necessary to move lever 68 to a position which will allow the assembly thereof in chuck I 3. The corresponding position of control 14 will limit the spindle speed to make the operation of the machine safe for the operators.

It is usually desirable in machines of this type to oscillate the abrasive element while it is rotating to obtain a smooth and even cut. In this device, it is accomplished by reciprocating the quill assembly as a unit. This feature allows the spindle bearings and seals to be dust free and to have a complete pressure lubricating system integral therewith.

Reciprocation of quill I is accomplished by energization of motor 2| which drives the eceentrically disposed stub shaft 25 which cooperates with block 21 slidably disposed in quill I5 to provide the desired motion. Individual control of the rotation of the spindle and the reciprocation thereof is achieved by the use of separate prime movers with selective energization. The pressure lubrication system for the bearings which supports the spindle functions immediately upon beginning the operation of the machine. The pump rotor 55 is directly connected to the spindle I 4 and develops a pressure in the oiling system during the total operating time of the machine. Oil is taken from the reservoir in the lower portion of quill I 5 and forced through the passages 58, 59, and 40 to the distributing ports at the upper end of the quill l5. whereupon the oil flows by gravity downwardly over the bearings 35 and -49 and returns to the reservoir. Adequate lubrication is thereby achieved at all times and contamination of lubricant supply is prevented.

It is to be understood that the specific nature of the present disclosure is not intended to be restrictive or confining and that various rearrangements of parts and modifications of design may be resorted to without departing from the scope or spirit of the invention as herein claimed.

What is claimed is:

A sanding machine comprising a horizontal table formed with a central opening, a spindle rotatably mounted in bearings below said opening, mounting means for affixing cylindrical abrasives of varying sizes to the spindle, said abrasives extending through the opening during operation, power means for rotating said spindle, an electrical circuit for said power means, a control device in said circuit having at least two positions for regulating the speed of said power means, a lever mounted on said table having one end adjacent said opening, a finger on said end of the lever engageable by abrasives larger than a predetermined size for preventing installation thereof, and a cable structure operably joining said lever and the control device for positioning the control device when the lever and the finger are moved to allow the installation of a larger size abrasive on the spindle, whereby the maximum speed of said power means is predetermined by the size of the abrasive installed on the spindle.

References Cited in the file of this patent 'UNITED STATES PATENTS Number Name Date 1,189,557 Gardner -1 July 4, 1916 1,295,359 Olson Feb. .25, 1919 1,550,712 Smith Aug. 25, 1925 1,570,356 Lane June 19, 1926 1,762,606 Bjorklund June 10, 1930 1,871,752 Simonds Aug. 116, 1932 1,881,839 Monson Oct. 11, 1932 1,922,589 K'oepke Aug. 15, 1933 1,949,975 Reeves Mar. 6, 1934 2,020,977 Warner et a1. Nov. 12, 1935 2,125,645 Money Aug. 2, 1938 2,167,647 Gideon Aug. 1, 1939 2,349,131 Anderson May 16, 1944 2,392,482 Komroff et a1. Jan. 8, 1946 I FOREIGN PATENTS Number Country Date 175,739 Switzerland May 16, 1935 374,933 Italy Sept. 18, 1939 481,423 Great Britain Mar. 9, 1938 509,054 Germany .1 Oct. 4, 1930 543,507 France June 3, 1922

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