US800722A - Multiple-spindle drill-chuck. - Google Patents

Description

' PATENTED OCT. 3, 1905.

N. W. ORANDALL. MULTIPLE SPINDLE DRILL CHUCK.

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UNITED STATES earner errion.

NATHAN 1V. CRANDALL, OF HARTFORD, CONNECTICUT, ASSIGNOR TO WILLIAM R. WOOD, OF MERIDEN, CONNECTICUT.

IVIULTIPLE-SPINDLE DRILL-CHUCK.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed April 13, 1905. $erial No. 255,343.

To (all whom, it may concern:

Be it known that I, NATHAN 1V. CRANDALL, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, haveinvented certain new and useful Improvements in Multiple Spindle Drill-Chucks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to an improvement in drill-chucks, and is closely allied to that class in which a plurality of spindles are employed and which are commonly termed multiplespindle drill-chucks.

The object of this invention is to produce a device which can be readily attached to the ordinary single spindle drillingmachines, thereby converting into a multiple -spindle drilling-machine, thus greatly increasing its capacity.

Further objects are to produce a device which will be compact in form, cheap to manufacture, and efficient in its operation.

My improved drill-chuck will be readily understood from the following description in connection with the accompanying drawings, in whicl Figure 1 is a view in longitudinal section, the several spindles and crank-arms being shown in elevation, the section being taken on line A A of Fig. 2. Fig. 2 is a plan View of the device shown in Fig. 1. Figs. 3 and at are respectively a plan and elevation of the compression-sleeve employed to hold the drills or other implements centrally and firmly in the spindles of the chuck. Figs. 5 and 6 are a plan view and elevation, respectively, of theintermediate sleeve. Figs. 7 and 8 are respectively a plan and a view in longitudinal section of the clamping-sleeve. Figs. 9'and 10 are respectively a plan and a view in cross-section of the wrist-plate. Figs. 11 and 12 are a plan and a cross-section of one of the hardenedsteel washers employed in the antifrictionbearing of the wrist-plate. Figs. 13 and 14 are a plan and cross-section of one of the hardened-steel washers employed in the antifrietion-bearings of the intermediate sleeves. Figs. 15 and 16 are respectively a plan and elevation of one of the crank arms, of which any number required may be employed. Figs. 17 and 18 are a plan and cross-section of the hardened-steel check-nuts, which act as a thrust-bearing for the body of the chuck.

Similar characters denote like parts throughout the entire views.

1 is the cylindrical case of the chuck-body.

2 is the upper, and 3 the lower, head of the chuck-body.

4: is the driving-spindle, and 5 the driving' disk, which may be formed integral with the spindle or secured thereto in any well-known and approved manner.

6 is the wrist-plate, which is journaled in the driving-disk.

7 is one of the hardened-steel washers which encircle the wrist-plate and which. with the hardened-steel balls 8, combine to form a thrust-bearing for the wrist-plate in a manner which is so common that further description is thought to be unnecessary.

9 represents the crank-arms, of which any number may be employed. The upper ends of the crank-arms are journaled in the wristplate, and the lower ends thereof are journaled in the lower head of the chuck-body. The body portions of the crank-arms are inclined to their bearing portions in order that they may pass over each other Without interference when rotating. The sleeves 10 (which I term the intermediate sleeves) are threaded onto the lower ends of the crank-arms and take revoluble hearings in the lower head, as shown at 11. The intermediate sleeves are provided with thrust-bearings 12 by inserting washers l3 and the balls 14 between their top ends and the shoulders 15 in the lower head between the spindlebearings and the intermediate sleeve-bearings. The intermediate sleeve is hardened to produce ahard contactsurface for the balls 1st. It is also recessed in its lower end to form a seat for one end of the compression-sleeve 16. The compressionsleeves 16 are slotted longitudinally from each end, so as to produce a more perfect clamping action when compressed upon the shanks of the drills or other tools which it may be desired to use.

17. represents the clamping-sleeves, which are recessed to receive the compression-sleeves 16 and are also threaded onto the lower ends of the intermediate sleeves 10. The ends of the compression-sleeves are beveled and take seat in both the intermediate sleeves and the clamping-sleeves. The clam pingsleeves are also correspondingly beveled, and, as will be seen, when the clamping-sleeves are screwed upon the intermediate sleeves the action of the beveled seats upon the ends of the compression-sleeves will be such as to cause a clamping action upon any tools placed within the bores 18 of the compression-sleeves 16.

Hardened nuts 19 are screw-threaded upon the driving-spindle and, with the washers 20 and the balls 21 and the cup 22, compose an antifriction thrust-bearing for the body of the chuck. The cup 22 is screw-threaded onto the upper end of the upper head of the body portion of the chuck, and a check-nut 23 is provided, by the clamping action of which aecidental displacement is obviated.

A stem 24: is secured to the body portion of the chuck in any well-known and approved manner, preferably by being screw-threaded into the cylindrical portion of the case, as shown, for the purpose of abutting against some stationary portion of the machine in which it is used to prevent the said case from rotating.

Suitable oil-holes 25 are provided in the different stationary parts to facilitate proper lubrication of the rotating parts.

To assemble the device, the procedure is as follows: The spindle 4 is passed up through the upper head 2, and the parts which constitute the main thrust-bearing are then assembled and secured in place by the cup 22, being held in place by the check-nut 23. The cylindrical portion of the case is next secured in place by the screw 26. The wrist-plate and its antifriction-bearing is next located in place. Next the crankarms are passed through the lower head and the intermediate sleeves screwed upon their lower ends. The upper ends of the crank-arms are then journaled in the wrist-plate, and at the same time the lower head is introduced into the open end of the cylindrical portion of the case and is secured therein by the screw 27. The compressionsleeves are nextplaced in the cupped end of the intermediate sleeves and the clamping-sleeves passed over them and engaged with the threaded portions of the intermediate sleeves, and thereby holding the compression sleeves loosely between the two aforesaid sleeves.

It is obvious that if implements or tools are placed in the bores of the compressionsleeves when in the conditions described above and the clamping-sleeves screwed home the beveled portions of the clamping-sleeves and the intermediate sleeves acting on the beveled portions of the compression-sleeves will cause them to contract upon the shanks of said tools and hold them firmly in place.

To operate the device, it is coupled to the rotating spindle of any suitable machine, and the stem 24: is abutted against some stationary portion of the machine, so as to prevent the body portion of the chuck from rotating, when it Will be found that the several tools will be revolved at the same speed as the driving-spindle of the machine to which it is coupled, so that when a piece of work is brought against the working points of the tools they will all be operating simultaneously.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

The combination with a holder having suitably-spaced heads connected by a casing, of a driving-spindle passing through one of the heads, a driving-disk within the casing secured to the spindle; said driving-disk having an eccentric aperture, a wrist-plate journaled in the aperture of the driving-disk, a plurality of crank-arms journaled at one end within the wrist-plate and at the opposite ends in the other head and provided with drill-holding means, and means secured to the casing to hold the same against rotation.

In testimony whereof I aflix my signature in presence of two witnesses. I

NATHAN V. CRANDALL.

WVitnesses:

IRvINo J. AVERY, S. FRANK Fox.

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