US1026389A - Hole-grinding machine. - Google Patents

Description

G. K. GARVIN & E. J. MOOLELLAN.

HOLE GRINDING MACHINE.

APPLICATION FILED AUG. 11, 1911.

1,026,389. Patented May 14, 1912.

3 SHEETS-SHEET 1,.

WITNESSES g I a g C, gVE/VTORS I q t 1/ M M ATTORNEY G. K. GARVIN & E. J. MOGLELLAN. HOLE GRINDING MACHINE.

APPLICATION FILED AUG. 11, 1911.

.1 ,Q26,389. Patented May 14, 1912.

3 SHEETS-SHEET 2.

WITNESSES S INVENTOI? If 0 7? m gmf pg 644.

M ATTORNEY G. K. GARVIN & E. J. MoOLELLAN.

HOLE GRINDING MACHINE.

APPLICATION FILED 16.11, 1911.

Patented May 14, 1912.

3 SHEETS-SHEET 3.

INVENTOR {##y {M M. NIH/HIE)! UNITED sTA Es PATENT OFFICE.

GEORGE K. GARVI [N AND EDWARD J. MoCLELLAN, OF NEW YORK,,N'. Y., ASSIONORS TO THE GARVIN MACHINE COMPANY, A CORPORATION OF NEW YORK.

HOLE-GRINDING- MACHINE.

Specification of Letters Patent.

Patented May 14, 1912.

To all whom it may concern Be it known that we, Gnonon K. GARVIN.

and EDWARD J. MoCLELLAN, citizens of the United States, residing at New York city, in the county of New York and State of New York, have, invented a new and useful Improvement in Hole-Grinding Machines, of "which the following is a specification.

This invention relates to machines for grinding or finishing surfaces, and particularly interior surfaces such as the axial bales of hardened gears, ball races and the li e.

Still more particularly the invention relates to a machine in which a grinding wheel or element rotates at a high speed,

and 'which is moved longitudinally into and out of a hole to be ground. in such a way that when fully withdrawn from the hole the rotation of the work will be stopped and an opportunity given the workman to caliper the hole.

The invention has for one of its objects a machine which is sensitive, i. e. which is operated by hand manipulation and in which the feel of the cut is constantly present in the control by the operator; (in practice an expert operator proceeds as much by the feel in a sensitive machine I as by sight.)

Another object of the invention is to provide for a very strong, compact and simple construction which is easily operated and which is ca able of performing a Wide range of wor or service.

The invention relates to an im roved machine for grinding holes or sur aces in its various aspects.

The invention consists in the features of construction, combination, location and arrangement, as hereinafter set forth.

In the drawings, Figure 1, is a side elevation partly broken away of a grinding machine embodying the principles of this invention; Fig. 2, is a top view of the same; Fig.3,is an end view partly in section, and Fig. 4 is a detail view showing a support for the grinding wheel.

Constructions embodying the invention will include a spindle carrying a chuck which is adapted to be rotated, and also a spindle carrying a grinding wheel or cutter which rotates at high velocity, preferably of the machine.

in a direction contrary to the direction of rotation of the chuck spindle. tion will further include means by which the grinding wheel and spindle may be 'ven a movement so as to cause the grindmg wheel to feed across the surface of the work which is. being ground.

In the drawings which illustrate the best The inven-.

practical constructions embodying the invention, 1 denotes a chuck-spindle, 2 a chuck, 3 a grinding spindle and 4 a grindmg wheel mounted on the grinding spindle.

5 denotes a carriage in which the grind-.

ing spindle is journaled, said carriage having a longitudinal movement in the frame of the machine such frame being denoted 6 in the drawing.

8 denotes the head-stock or journal support for the chuck spindle. In accordance with the best constructions embodying the invention, the head-stock will be adjustable to swivel in different directions in a horizontal plane, and will be further rovided with a feed by which it may be given different lateral positions on the bed or frame As illustrated the headstock has a circular base?) with arc shaped slots 10.

11 denotes bolts or screws passed through the arcuate slots 10 and into the table or transversely movable frame 12. This table or frame 12 has narrow ways 13 guided in corresponding ways 14 of the bed.

15 denotes a screw feed with a micrometer adjustment 16, the screw feed acting to position the table 12 and thereby the chuck spindle in any lateral position.

Means may be provided for driving the chuck spindle and also the grinding spindle, and in the best constructions embodying the invention will include a drum 17 in a shaft 18 journaled in bearings 19 within the -frame'6 and below the carriage 5. 20 .de-

notes a shaft which as later described, may

constitute a driving shaft. The latter shaft sired character, and 30 denotes a sleeve constituting the driven member of the clutch and separate from the shaft 20 which constitutes the driving shaft of the clutch.

The sleeve 30 carries a pulley -31 belted by a belt 32to a pulley 33 of the chuck spindle 1 through a reducing speed ratio. Means are provided for engaging and disengaging the elements of the clutch 29 so as to put this clutch into and out of its driving relation. The meansemployed for this purpose may vary somewhat in practice, but in accordance with the best-practical embodiments of the invention, will be controlled from the carriage 5, and in such a way as to release said clutch only at or near the limit of the rearward movement of said carriage...

Referring to the drawings, 35 denotes a segment-gear meshing with a rack 36 on the under side of the carriage 5. This segment-gear is fixed to a shaft 38 extending transversely of themachine and having a crank or handle 40 by which the shaft and thereby the segment-gear are oscillated and the carriage 5 moved longitudinally of the bed. The carriage 5 has a long guide po-rtion41 in order to obtain an arcuate guide and for certain other purposes'which will later'appear, and it is ordinarily made as,

light as possible, as of aluminum, and depressed or cut away at 42 in order to make it as light and sensitive as possible. The depression 42 also 'ves a clearance for the swing of the chu 2.- 43 denotes a stop on the carriage which limits the forward movement thereof and which is adjustable. These details of the carriage may of course vary somewhat in practice without departing from the spirit and scope of the in vention. I

$5 denotes a pin forming inefiect a crankpin of the gear-segment and having depending therefrom a link or pit-man 50 which is in turn connected to a bell-crank 51 with a fork 52 received in the groove or collar 53, said collar constituting a member for releasing the clutch 29 and being'normally pressed in a direction to tighten said clutch by a spring 55 on the shaft 20. 56 denotes a fixed collar on said shaft to take the thrust of said 5 ring 55.

59 denotes a s 0t in the link or pitman 50,

,the length of which is adjusted by the screw 60, and accordingly the pin 61 of the bell-' crank 51 has a play in its relation to the pitman 50 determinedby the length of this slot. The effect is to cause anengagement of the bell-crank and the release of the clutch when the link 50 has been pulled upnoted that the clutch is re carriage 5 the disengagement or release of the clutch 29 will stop the rotation of the chuck spindle 1 and permitthe work to be calipered,

Reference has been made to the fact that the movement of the carriageis made light and sensitive, and it is partly for this purpose that the carriage is made without adjustments such as lateral feed's,'the grinding spindle 3 rotating in fixed bearing of the carriage. This gives rigidity combined with lightness, and minimizes. vibration. Ball bearings, as Hessbright or other type, are used for the grinding spindle.

In accordance with the best constructions embodying the principles of the invention, a means for guidlng the carriage in its movement will be employed which permits of ready adjustment, and which is not liable to wear or abrasion from emery diist or other abradent which may work into the interstices of the bed. The means will also be conducive to the sensitiveness and freerace-ways, and for this purpose I provide v pins 66 which project through the race-ways at intervals, such intervalscorresponding to a distance at least half the maximum travel of the carriage plus the distance or length occupied by one group of balls. In this way the different groups of balls are kept distributed along a length tof the carriage,

so that the latter is adequately supported at all points of its length. At the same time it.

is freely guide-d. with an almost frictionless movement and the nature of the ball and race-way relation in such that'there is no appreciable wear from any emerydust which may find its way into the race-ways. of the raceways 62 is adjustable in the bed of the -machine, being free to move horizontally in its contained slot or groove and held at different positions of adjustment by the screws 70-. By adjusting these screws any looseness may be taken out in both raceways simultaneously.

73 denotes strips of felt located over the race- ways 62, 63, and held down bymetallie strips or weights. The purpose and effect is to preclude the entrance of emery into the race-ways.

In the use of the machine poweri's applied to the shaft 20by a pulley 78; or to the shaft 18 by a motor (not shown) within the frame 6. The rotation of the drum is communicated to the grinding spindle or spindles by a belt or belts 79 at a multiplying speed One" ratio, and on account of the length of the drum 17 this driving ratio is preserved for any position of the carriage, the belt traveling along the drum to new positions by a familiar principle. The emery or grinding wheel or cutter 4 is carried on the grinding spindle, and I provide means by which a very small wheel or a very large wheel may be adequately supported. 80 denotes a pin screwed into the end of the grinding spindle and adapted to constitute a hub or axis on which a small grinding wheel may be received. It will be evident that such a small wheel is properly centered and may have an outside diameter scarcely greater than the outside diameter of the grinding spindle. This pin though adequate to. hold a small grinding wheel is too small to properly support a large wheel.

85 denotes a bushing preferably with a coned central hole adapted to be slipped over a correspondingly tapered end of the grindin spindle. This bushing has a screw collar 8 and is adapted to receive a large 25 grinding wheel 88. The screw pin 80 in this case constitutes a means for holding the bushing on the spindle, a couple of washers or similar cap 90 being interposed if desired.

Means are provided by which the rotation of the chuck spindle is arrested promptly, although not so abruptly as to throw off any of the belts. It will be observed that the fork 52 of the bell crank 51, is engaged in a collar forming part of the clutch 29. As shown the clutch 29 comprises a common type of which the outer casing rotates in one piece or unit and is loose on the shaft 20. The inner member 92 is fixed to the shaft. The movement of the collar 53 shifts the entire clutch casing 29 to the right so as to loosen the clutch at the engagin faces 92, 93. At the same time the entire orce of .the spring 55 is brought into action to force the collar against the fork 52, and this produces a friction or braking action which promptly arrests the rotation of the clutch 29. The chuck spindle 1 is therefore stopped. promptly. During the normal running of the machine however, the force of the spring 55 is taken up between the face 93 and the collar 56 so that there is no force against any fixed bearing .to interfere with the rotation of this shaft or produce heating. It will be'understood that the chuck 2 may be of any desired character but in order to cooperate with the other features of the invention the chuck 2 will be and is shown as an automatic chuck such as described in Patent No. 927,424, filed July 6, 1909, or our copending application Serial No. 643,486, filed of even date herewith. In other words there will be a draw tube or rod within the spindle 1 and operated as described in the patents just referred to. The result is to move the jaws into and out of clamping relation on the work practically simultaneously with the stoppage of the rotation, and the jaws will furthermore always clamp the work in an exact relation to a given center or axis thereof.

What we claim is '1. In a machine of the class described, a chuck spindle, a grinding spindle, a transversely adjustable head-stock for said chuck spindle, a lon itudinall movable carriage for said grin ing spin le, and means for stopping the rotation of the chuck spindle when said carriage is moved beyond a predetermined range.

2. In a machine of the class described, a chuck spindle, a grinding spindle, a swiveled and transversel adjustable head stock for said chuck spindle, a longitudinally -movable carriage for said grinding spindle,

and means for stopping the rotation of said chuck spindle when the said carriage is moved beyond a predetermined range.

3. In a machine of the class described, a chuck spindle, a grinding spindle, an adj ustable head-stock for said chuck spindle, a constantly rotating drum beneath said grinding spindle and belted thereto, said rum having a peripheral length equal to the travel of the carriage and a longitudinally movable carriage aving bearings for said grinding spindle.

n a machine of the class described, a

chuck spindle, a grinding spindle, a carriage for said grinding spindle, ,a hand-lever connected to reciprocate said carriagelongitudinally, and means operated by a movement of the said hand-lever beyond a predeterminedrange for stopping the rotation of said chuck spindle.

5. Ina machine of'tlie class described a chuck spindle, driving connections-therefor including a clutch, a grinding spindle, a hand-lever for, moving said grinding spindle longitudinally, and means including a slotted link connection for throwing out said clutch when said hand-lever is moved beyond a predetermined range.

6. In a machine of the class described, a chuck spindle, a grinding spindle, driving connections for said 'chuck spindle includin a clutch, a carriage for said grinding spindle having a rack on its'under side, a hand-lever having a segment gear meshing with said rack, a link, and means connecte to said link for throwing out said clutch when the carriage moves beyond a predement for said link, said link being located to be on a dead center when at theend of its of two subscribing witnesses, this 8th day of travel, whereby it is looked and held in this August, 1911.

position, and means connected to said link for throwing out said clutch when the oargfi nL 5 riage moves beyond the predetermined C range. 1 Witnesses In testimony whereof, we have signed our FREDERICK E. SEDDON,

names to this specification in the presence FRANK A. POWER.

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