US791570A - Grinding-machine. - Google Patents

Description

` No. 791,570. I i PATENTED JUNE 6, 1905;

- G.`H. NEWTON.

GRINDING MACHINE.

APPLIUATION FILED Nov. 7,1904.

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110.791.570. PATENTED JUNE 6, 1905.

G. H. N EWTQN.' -GRINDING MACHINE.

` APPLICATION FILED NOV. '1, 1904.

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. INVENTDH' Xy- 75M;

APPLICATION FILED Nov. 7,1904. l

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UNITED STATES Patented June 6, 1905.

PATENT OFFICE.

GEORGE II. NEWTON, OF PROVIDENCE, lRHODE ISLAND, ASSIGNOR TO BROWN AND SHARPE MANUFACTURING COMPANY, OF PROVIDENCE RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

SPECIFICATION forming part of Letters Patent No. 791,570, dated June 6, 1905. i

Appteaion mea November 7, 19011. sei-in No. 231,746.

[0 all whom it may concern:

Beit known that I, GEORGE H. NEWTON, residinginthe city and county of Providence and State of Rhode Island, have invented certain new and useful Improvements inGrinding-Machines; and I do hereby declare the following specification, taken in connection with the accompanying drawings, forming a part of the same, to be a full, clear, and exact description thereof.

The invention relates to grinding-machines,

and more especially to a construction of head-` stock which may be employed in grinding out cylinders or in grinding other internal surfaces. 'Ihe head-stock may form a permanent part of a grinding-machine or may be constructed as an attachment to be used upon grinding-machines such as are ordinarily employed for grinding external surfaces.

For the purpose of illustration I have shown the invention embodied in an internal grinding attachment adapted to be applied to a grinding-machine which is provided with a reciprocating work-carrying table.

rIhe various features and combinations comprised within the invention will be set forth in the claims and will be understood from the following detailed description of the attachment above referred to.

In the drawings, Figure l is a rear elevation ofthe attachment and so much of one end of a grinding-machine as is required to show the application of the attachment thereto. Fig. 2 is an end elevation looking toward the right in Fig. l. Fig. 3 is a transverse sectional view through the head-stock on line 3 3, Fig. 6. Fig. 4 is a partial elevation looking toward the right in Fig. 3. Fig. 5 is a sectional viewon line 5 5, Fig. l, certain of the p'arts being omitted. Fig. 6 is a longitudinal sectional View on line 6 6, Fig. 2; and Figs. 7 and 8 are longitudinal and transverse sections, respectively, showing a modified form of the device for adjusting the spindle-carrying cylinder.

As shown in the drawings, the head-stock Ag'in which the grinding-wheel spindle and devices for-.actuating the same are mounted,

is secured upon lone end of the bed B of the grinding-machine so that ythe spindle extends above the work-carrying table C and parallel. to its line of reciprocation. The headstock is' supported upon a frame D, securedto the base B of the machine and surrounding the Work-table, as indicated in Fig. 2. Y The head-stock is mounted upon a base A', which may be adjusted laterally upon the frame D justed vertically in bringing the parts carried thereby into proper alinement with the work,

it is adjustably secured upon the base A. As shown, the head-stock is provided with lugs- 1 by means of nuts a, threaded upon a screw-- a rod c', projecting from the base, the nuts being o5 c, the rear. lugs a5 being pivotally connected with similar lugs t7 on the base and the front lugs a being connected with lugs as on the base by means of clamping-bolts a9, which pass through slots in the lugs a" and are threaded in the lugs a8. When the clampingbolts agare loosened, the head-stock may be adjusted vertically by means of nuts al", (only one of which is shown,) threaded uponascrewrod au, extending vertically from the frame D through a lug w12 on the head-stock. During the grinding operation the grindingwheel is rotated at a high rate of speed about its own axis and at the same time is caused to travel about the axis of the surface which is In order that the wheel being acted upon. may have this traveling movement about the axis of the work, the grinding-wheel spindle E is mounted' eccentrically in a revolving drum F, supported in bearings in the headstock, and in order that the distance between the axis of the spindle and the axis of the revolving drum may be varied in accordancel with the curvature of the surface being ground the spindleE is eccentrically supported in a cylinder G', which is in turn eceentrically mounted in the drum F. With this construction the distance between the axis of the spindle E and the axis of the revolving drum F may be accurately and conveniently adjusted by turning the cylinder G in its bearings, and

' thus the grinding-wheel may be adjusted so that its peripheryT will travel in a circular path of any required diameter. The drum F is rotated continuously during the grinding operation through a gear F secured thereto and connected with a shaft F2 by means of a pinion F3 and an intermediate gear F4. rIhe shaft F2 is driven from a pulley-shaft F5 through gears F6.

The cylinder G may be turned in the drum F to vary the adjustment of the spindle E by means of a wornf G', engaging a worm-wheel G2, formed on the cylinder G. The worm is secured to a shaft G3, mounted in the drum F and provided with a squared end G4 for the reception of a wrench. When the drum F is at rest, the cylinder G may be'turned by applying a wrench to the squared end Gfi of the shaft G3, the guard A2 being removed to give access to the end of the shaft, or a hole may be made in the guard A2 for the passage of the wrench. By this means the spindle E may be adjusted to bring lthe grinding-wheel into close' proximity to the surface to be gro und in setting up the machine for any given piece of work. When the cylinder G has been once adjusted, it will be held accurately and rigidly in position by the engagement of the worm with the worm-wheel. This adjusting means also enables a fine and accurate adjustment of l the grinding-wheel to be made. In order that the spindle may be adjusted during the grinding operation to bring the grinding-wheel against the surface to be ground or in setting the grinding-wheel for taking a fresh cut, means are provided for operating the worm Gr' during the rotation of the drum F. This means consists of a ratchet-wheel g, secured to the worm and arranged to be engaged by a pawl g', pivoted in a sleeve g2, which is mounted to slide upon and turn with the drum F. The sleeve g2 is provided with an annular groove g3 and is connected with a pivoted `yoke g4 by means of shoes g5, carried by the arms of the yoke and engaging the groove. The yoke may be swung about its pivot to move the sleeve g2 backward and forward upon the drum F by means of an operatinglever Q6, pivoted to the head-stock and connected with the yoke by means of a roll g7, mounted on one arm of the yoke and engaging a groove in the operating-lever. These connections between the operating-lever and the sleeve g2 enable the sleeve to be operated without interfering with its rotary motion.

When the operating-lever is moved toward the left in Fig. 6, the pawl g2 rides idly over the ratchet-teeth of the wheel f7 until the tail of the pawl engages the rear end f of the slot in the drum F, in which the pawl travels, when the pawl is lifted out of engagement with the ratchet. With the pawl in this position the worm may be turned to rotate the cylinder G in either direction. When the operating-lever is moved toward the right in Fig. 6, the pawl g immediately engages the teeth of the ratchet-wheel, and as the movement of the lever continues the pawl acts to turn the Wormwheel, thus turning the cylinder Gr and changing the adjustment of the grinding-wheel spindle E. The range of movement of the operating-lever may be,limited and regulated by means of two adjusting-screws g8, arranged to engage opposite sides of the lever, Fig. 4. By this arrangement the movement of the operating-handle may be regulated to give a very line and accu rate adjustment to the grinding-wheel.

In Figs. 7 and 8 a modified form of operating means for the worm G is shown, by which the worm may be turned in either direction during the rotation of the drum F. In this construction two oppositely-arranged ratchet-wheels /L /a are secured to the wormshaft, and two oppositely-arranged pawls k3 are pivoted on a pawl-carrying arm t, which is mounted on the worm-shaft. The pawl carrying arm is connected with the sleeve g2 by means of a pin It, working iu a slot in the end of the pawl -carrying arm. When the operating-lever g is in mid-position, both pawls k2 lt are held out of engagement with the ratchet-wheels by a plate lt, arranged between the ends of the pawls and the ratchet-wheels. If thc arm is moved toward the right, the pawl /1/2 will ride ofi the edge of the plate It and operate upon the ratchet-wheel /t and turn the worm forward. During this movement of the operating-arm and sleeve g2 the pawl t will ride idly on the plate L. If the operating-lever is moved from mid-position toward the left, then the pawl k3 will act upon its ratchet-wheel to turn the worm in a reverse direction, the pawl riding idly on the plate LG.

The bearings in which the grinding-wheel spindle is journaled are mounted in two sleeves or bushings E E2, secured eccentrically in the cylinder G. The front sleeve E projects forward from the end of the drum F and cylinder G, so that the grinding-wheel may extend the required distance within the cylinder or other work being ground. It is desirable that this sleeve or bushing E should be of sufiicient diameter to rigidly support the outer end of the grinding-wheel spindle in order that the wheel may act eicientl y and accurately upon the work.

Since the necessary requirements as to the size and length of the sleeve E vary with different pieces of work, it is of advantage to be able to vary the extent to which the spindle IOO extends beyond the end of the drum F and also to be able' to. vary the size of the supporting-sleeve for grinding-wheels of different size and for different classes of work. I have made provision for such variation by employing a front sleeve E', which may be removed and replaced with a sleeve of different size, and by also forming the spindle in two sections, the front section being mounted in the sleeve E' so that it is removable therewith. The rear section of the spindle is mounted in the rear sleeve E2, and the two sections are connected together by acoupling E3, which does not interfere with the removal of the sleeve E and front section and is readily engaged when a dilferent front sleeve and front spindle-section is secured in place. The spindle is driven through a pulley E4, mounted upon the rear bearing for the spindle and connected with the end of the spindle by means of a plate E5 and nut E. e, which drives the spindle, passes over the pulley E4, over two idle pulleys e', carried by a frame e2, and around `a pulley c", secured to a driving-shaft e4. ln order to accommodate the rotary travel of the spindle, the frame e2 is pivoted on the driving-shaft'e and is connected with the sleeve E2 by means of a link e5, one end of which is pivoted to the frame e2 and the other end of which surrounds a bearing formed on the outer end. of the sleeve E2.

The construction described forms an efficient and reliable mechanism for grinding internal surfaces in which the spindle may be accurately and conveniently adjusted either when the drum F is in motion or when it isv at rest and in which the spindle when adjusted is rigidly and accurately held in position, so that the work may be accurately and rapidly ground.

What I claim, and desire to secure by Letters Patent, is-

1. The combination of a spindle, a rotary drum in which the spindle is eccentrically mounted, and meansv for varying the eccen- .tricity of the spindle during the rotation of the drum. y

2. The combination of a spindle, arotary drum in which the spindle is eccentrically mounted, an adjustable part carrying the spindle, a worm-wheel connected with said part, a worm coperating therewith to effect the adjustment of said part, and means for operating the worm during the drum.

8. The combination of a spindle, a cylinder the rotation of -in which said spindle is eccentrically mounted,

a revolving drum in which the cylinder is eccentrically mounted, and means for adjusting the cylinder during the rotation of the drum.

4. The combination of a'spindle, a cylinder in which the spindle is eccentrically mounted, a revolving drum in which the cylinder is The beltv eccentrically mounted and means for adjusting the cylinder in either direction during the rotation of the drum.

5. The combination of a spindle, a cylinder .in which the spindle is eccentrically mounted, a revolving drum in which the cylinder is eccentrically mounted, a worm-wheel on the cylinder, a worm on the drum for adjusting the cylinder in lthe drum and means for operatingthe worm during the rotation of the drum.

6. The combination of a spindle, a cylinderv in which the spindle is eccentrically mounted,

a drum in which the cylinder is eccentrically mounted, a worm-wheel on the cylinder, a worm mounted on the drum, a ratchet-wheel connected with the worm, a sleeve mounted to slide on the' drum, a pawl on said sleeve, and 'a fixed operating device for operating said sleeve. Y

7. The' combination of a spindle, a cylinder in which the spindle is eccentrically mounted a revolving drum in which the cylinder is eccentrically mounted, a worm-wheel on the cylinder, a worm on the drum, a ratchetwheel connected with the worm, a sleeve mounted to slide on the drum, a pawl carried by the sleeve, an operating-lever, and connections between said lever and said sleeve for operating the same.

8. The combination of a spindle, a revolving drum in which the spindle is eccentrically mounted, means for adjusting the eccentricity of said spindle during the rotation of the drum, and devices for regulating the move# ment of said adjusting means.

9. The combination of a spindle, a revolvfing drum in which said spindle is eccentrically mounted, a lever, connections between said lever and spindle for varying` the eccentricity of the spindle, and regulating-screws determining the movement of the lever.

10. The combination of a head-stock, a re-' volving drum mounted therein, a spindle eccentrically mounted in the drum, means for adjusting the headstock laterally, and means for adjusting the head-stock vertically. v

11. The combination of a head-stock, a re- Ipo IIO

volving drum mounted therein, a spindle eccentrically mounted in the drum, means for adjusting the eccentricity of the spindle, means for adjusting the head-stock laterally,y and means for adjusting the head-stock vertically.-

12. The combination of a revolving drum, a

spindle eccentrically mounted therein and formed in sections, a removable sleeve projecting from the drum and carrying the front section of said spindle.

13. The combination of ay rotary drum, a

cylinder eccentricallymounted therein, a rear sleeve mounted in said cylinder and provided with bearings for the spindle carried by said sleeve, a removable front sleeve mounted in said cylinder and provided with bearings for the spindle, a rear spindle-section mounted in the rear sleeve, a front spindle-section mounted in the front sleeve, and means for coupling said sections together.

14. The combination of a revolvingdrum, a removable sleeve eccentrically mounted in said drum and projecting therefrom, bearings in said sleeve for a spindle-section,a second sleeve mounted in said drum in line with the removable sleeve, bearings in said second sleeve, a second spindle-section, and a coupling device for connecting the spindle-sections when the sleeves are in place.

15. The combination of a spindle, a cylinder in which the spindle is eccentrically mounted, a revolving drum in which the cylinder is eccentrically mounted, two oppositely-arranged ratchets connected with said drum to operate the same, two pawls for operating said ratchets in opposite directions, and means for operating either of Said pawls during the rotation of said drum.

16. The combination ofaspindle, a cylinder in which the spindle is eccentrically mounted, a revolving drum in which the cylinder is eccentrically mounted, a Worm -wheel on the cylinder, a worm on the drum, two oppositelyarranged ratchet-Wheels connected with the worm, two pawls, and a lixed operating device for operating said pawls.

17. The combination of a spindle, a cylinder in which the spindle is eccentrically mounted, a revolving drum in which the cylinder is cccentrically mounted, two oppositely-arranged ratchets connected with the cylinder to move it in opposite directions, two pawls, an operating device therefor, means for holding said pawls out of operation and for bringing them alternately into operation as thc operating device is moved from mid-position in opposite directions.

18. The combination of a spindle, a cylinder in which the spindle is eccentrically mounted, a revolving drum in which the cylinder is eccentrically mounted, a worm-wheel on the cyl inder, a worm on the drum, two oppositelyarranged ratchet-wheels connected with the worm, asleeve mounted to slide on the drum, two oppositely-arranged pawls connected with Said sleeve, and a fixed operating device for operating the sleeve.

GEORGE H. NlClVTON.

Witnesses:

W. H. THURsToN, J. H. THURsToN.

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