US2119036A - Thread forming chaser supporting and adjusting means - Google Patents

Description

.May 31., 1938. .1 s. BARTEK 2,119,036

THREAD FORMING CHASER SUPPORTING AND ADJUSTING MEANS Filed July so, 1936 FEE-4 INV R. John 5 Z Q I ZBK ATTORNEY.

Patented May 31, 1938 UNITED STATES PATENT OFFICE THREAD FORMING CHASER SUPPORTING AND ADJUSTING MEANS Application July 30, 1936, Serial No. 93,438

2 Claims.

My invention relates to thread forming chaser supporting and adjusting means, with more particular reference to a type of construction which employs a circular chaser, and has for its object to afford a simple and practical arrangement that enables accurate adjustment of the chaser on its supporting block.

A more particular object of the invention is to provide a chaser supporting block adapted to receive a circular chaser, which can be readily positioned therein after grinding, and its operating position determined by a fine adjustment mechanism effective to bring the cutting edge into proper relation to the center line of the machine.

A further purpose of the invention is to afford a construction permittinga fine adjustment of the chaser on its supporting block, and mounting the chaser and adjusting mechanism in such fashion on the block that the helical angle of the thread that is out is determined by the angular relation of the chaser to the block on which it is mounted.

To these and other ends, the invention consists in the construction and arrangement of parts that will appear clearly from the following description when read in conjunction with the accompanying drawing, the novel features being pointed out in the claims following the specification,

In the drawing:

Fig. 1 is an end elevation of a die head showing the application thereto of one embodiment of the invention;

Fig. 2 is a plan view of the same;

Fig. 3 is a side elevation, partially in section, of one of the supporting blocks, and its chaser secured in position;

Fig. 4 is a plan view of one of the supporting 40 blocks with the chaser removed;

Fig. 5 is a bottom plan view of the same;

Fig. 6 is an end elevation of the adjusting plate, and

Fig. 7 is an end elevation of the chaser.

Referring more particularly to the drawing, in which like reference characters refer to the same parts throughout the several views, I designates a die head which may be of conventional form and provided with a series of transverse slots 2 50 Within each of which is mounted a chaser supporting block 3 that abuts the outer face of the head I and. has a flange l engaging and guided in the slot or guideway 2. The several chaser supporting blocks are movable transversely in the slots or guideways 2 for the opening and closing operations of the die head and are also removable from the die head when different chasers are required, all of which forms no part of the present invention and is in accordance with known types of automatically-opening die head structures.

In the present arrangement, each chaser supporting block 3 is provided with a circular type hollow chaser, set at an angle to the longitudinal axis of the supporting block and die head, and the block is provided with means for effecting a fine adjustment of the chaser thereon while maintaining the predetermined angular relation between the chaser and the supporting block.

To accomplish this, the supporting block is provided with a threaded opening 5 disposed at an angle to the longitudinal axis of the supporting block when the latter is positioned in the head, as indicated in Fig. 5, said opening 5 being adapted to receive a clamping screw 3 which acts to hold the chaser on the block. The hollow chaser is designated at '1, having cutting elements arranged parallel, and perpendicular to its longitudinal axis, and the chaser is. provided at its front end with a recess to receive the head 8 of the clamping screw. The clamping screw 6 extends through a sleeve 9 that is provided with a series of longitudinally extending serrations arranged exteriorly thereof and which engage corresponding serrations II] in the interior of the chaser I and thus lock the sleeve to the chaser.

A portion of the sleeve 9 extends beyond the chaser I, as shown in Fig, 3, and this part of the serrated sleeve 9 extends within an opening II] in the adjusting plate I I, the opening in which is similarly serrated to lock the sleeve 9 in relation thereto. The adjusting plate II includes oppositely extending arms I2 which underlie the overhanging portion I3 of the supporting block, and said portion I3 is provided with threaded openings I4 that receive the adjusting screws I5. The latter engage the two arms or extensions I2 of the adjusting plate, and are operable to move said adjusting plate in one direction or the other to bring the cutting edge of the chaser in exactly the proper relation to the opposite chaser and to the center line of the machine. The openings I i which receive the adjusting screws iii are disposed in a line located at an angle to the outer face of the head and the adjacent face of the supporting block, as shown in Fig. 4, corresponding to the angle at which the chaser is set on the supporting block, so that the adjusting screws will be brought into proper cooperation with the arms I2 on the adjusting plate II.

With this arrangement, the chaser is provided with cutting elements extending annularly therearound and arranged at right angles to the longitudinal axis of the chaser, the helical angle of the thread being determined by the angular position of the chaser on its supporting block. The chaser is removed from the supporting block for grinding by loosening the clamping screw 8, and after grinding, the chaser and serrated sleeve 9 are positioned within the serrated opening of the adjusting plate ll so as to bring the cutting edge [6 of the chaser to its approximate proper position, and it is then adjusted accurately to bring its cutting edge in proper relation with the center line of the machine by turning one or the other of the adjusting screws l5. This rocks the sleeve 9 about the clamping screw 8 and with it the chaser until the desired position of the latter is obtained, whereupon the. clamping screw 8 is tightened, while the screws l act' to hold the chaser in its adjusted relation on the supporting block and prevent turning of the same.

While the invention has been described with reference to a particular structural embodiment, it is not confined to the details herein shown, and this application is intended to cover any modifications or departures coming within the purposes of the improvement or the scope of the following claims.

I claim:

1. The combination with a support, of a circular chaser, a clamping screw extending through the chaser and securing it to the support, a sleeve within the chaser surrounding said screw, an adjusting plate surrounding said sleeve and having an oscillatory movement therewith around the screw, the sleeve having exterior serrations engaging corresponding serrations in openings of the same diameter in the chaser and in the adjusting plate for locking said parts together, and means on the support for rocking the adjusting plate about the screw in opposite directions and holding it in adjusted position.

2. The combination with a support, of a circular chaser, a clamping screw extending through the chaser for securing it to the support, a sleeve surrounding said clamping screw and provided with exterior serrations engaging corresponding serrations in the chaser, an adjusting plate also surrounding said sleeve and having corresponding serrations engaging therewith whereby the adjusting plate and chaser are locked to the sleeve, the serrated portions of the sleeve within the chaser and adjusting plate being of the same diameter and the adjusting plate having oscillatory movement about the screw for adjustment, oppositely extending arms on said adjusting plate, and adjusting screws threaded in the support and engageable with said arms for rocking the adjusting plate in opposite directions and looking it in adjusted position.

JOHN S. BARTEK.

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