US1373104A - Screw-cutting device - Google Patents

Description

. A. SIGALUN.

SCREW CUTTING DEVICE.

APPLICATION FILED DEC- 1. 191a Patented Mar. 29, 1921 A. SIGALON.

SCREW CUTTING DEVICE. APPLICATION FILED Dec. 2. ms.

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SCREW CUTTING DEVICE.

APPLICATION FILED DEC-7.1918.

Patented Mar. 29, 1921.

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NORRIS FE'IEHS WC. L1THO., WASHINGTON D C PATENT OFFICE.

ANTOINE SIGALON, OF LYON, FRANCE, ASSIGNOR TO ARMANI) CARRETTE, OF PARIS,

. FRANCE.

SCREW-CUTTING DEVICE.

Specification of Letters Patent.

Patented Mar. 29, 1921.

To ZZ w from it may concern.

Be it known that I, AN'rorNn SIGALON, a citizen of the Republic of France, residing at Lyon, Rhone, 28 Rue Bancel, in the Bepublic of France, engineer, have lnvented certain new and useful Improvements in Screw-Cutting Devices, of which the following is a specification.

This invention has for its object to provide an improved screw-cutting device for cutting screw threads of different diameters, between very wide diametral lnnlts, by means of one and the same set of dies having a given pitch, the dies that are employed being easily removable and replaceable by other dies having a different pitch.

By way of example, Figure 1 of the accompanying drawings illustrates an 1mproved hand-actuated screw-cutting devlce according to this invention.

Fig. 2 is a cross section thereof on the line 2-2 of Fig. 1.

Figs. 3, 4- and 5 are detail views of the chief parts of this improved screwcutting device.

Fig. 6 is a longitudinal section, and Fig. 7 is a section on the line 7-7 of Fig. 6, of a power-driven screw-cutting device for a lathe.

Fig. 8 and Fig. 9 are views showing the different positions of the hooks and lever.

The improved manual screw-cutting device, in the form shown in Figs. 1 to 5, consists of a circular box or casing a having formed in one piece therewith two radially extending handles I) for operating the same. In the internal cavity of this box a are ar ranged four similar dies 0 one of which is shown in detail in front and side view in Fig. 5. Each of these dies consists of a body part terminating at one end in a cylindrical head a serrated at its other end for forming a screw thread of any desired pitch. On one side of the body part of the die is a stud 0 The dies have their cylindrical heads 0 seated in bearings d, provided in the interior of the box a, in which they are capable of rocking. The box is closed on two sides by plates 6 and g bored concentrically to receive a screw-blank of the maximum diameter for which the screw-cutting device is made. The plate 6 is seated in the margin of said box so as to be freely rotatable therein on its own axis. This plate is held in place by a ring 7. The plate g closes the lower side of the box, and has two stems d that extendthrough the plate e. Two milled nuts 2' are screwed on these stems and serve to hold. the plate 9 in place but allow of its easy removal. The plate a has four tangential slots j in which the studs 0 of the dies extend, and by the rotation of the plate a on its own axis, the dies are caused to move their serrated ends toward or away from one another. This adjustment of the dies in the bearings (Z of the box, enables a screw-thread to be cut of any size within predetermined limits. The rotation of the plate 6 and the fixing of the sen]. plate for the purpose of maintaining the dies at a given adjustment, are effected by the following means In the said plate 6 and disposed axially at right angles thereto there is fixed. a screw is. At another point against the exterior surface of the box a there is provided a bracket Z in which is rotatably mounted a stud m ending in a head that is apertured and internally threaded to a nut for a screw n, this screw being actuated by means of a milled head 7? This screw H is terminated at its other end by a hook at which is adapted to engage the screw 70 of the plate 6. ()n the contrary when the lever is brought into the position shown in Fig. 9, the stud 0 will drive back the hook a and the latter will. therefore set free the screw K, whereby the screw it can be pivoted upon its support Z. The comb-shaped members can then be instantly separated to disengage the drawplate.

The diameter to which each adjustment of the dies corresponds may be indicated on a scale (not shown) carried by the ring f, and pointer or a micrometer index may be engraved on the plate 6 and serve as a register mark for indicating the divisions of the seals.

By removing the plate 9 it is easy to withdraw the dies either for cleaning purposes or for substituting therefor other dies of a different pitch.

For its application to lathes the improved screw cutting device may be modified in the manner shown in Figs. 6 and 7 According to this construction, the body part a of the screw-cutting device ends in a tail or sleeve 0? held by the lathe. In front of this body part there is provided an annulus 1' that contains bearings wherein the dies 0 are pivoted. The rotation of this annulus causes the dies to swing outward, the studs 0 of these latter beingengaged in slots 7' formed in the body part a The annulus 1" is fixed to a sleeve 8 that surrounds the body part a and is held by spurs t engaging in slots a that allow the sleeve 8 to rotate. The adjustment of the dies to the diameter of the screw thread to be cut, is effected, as in the hand actuated screw-cutting device, by means of a screw n threaded in a pivotally mounted nut carried by the body part a The screw 11, has a hook 113, which engages with a screw 70 carried by the sleeve 8. The disengagement of the hook is effected by the rotation of the spur 0 the movement of which can be easily produced automatically by an adjustable rod 0 being caused to abut against a stop that rotates with the spindle or the lathe and is adjusted to open the screw-cutting device after a determined traverse.

The removal of the dies is effected by withdrawing a plate g that is held by nuts 2' screwed on the bolts 72,

' Having now particularly described the construction and operation of my said invention, I declare that what I claim is 1. A screw-cutting device comprising screw-cutting dies, a casing formed in its internal periphery with bearings for the screw-cutting dies, each die having its outer end pivoted in one of said bearings and being provided on one side with a stud, an annular disk mounted rotatably on the said casing and being formed with slots wherein the said studs of the dies are slidably cngaged, and means including a screw and a nut for maintaining the said disk in different adjustments relative to the said casing, the said screw having a head on one end and a hook on its opposite end, the said disk being provided with a projection adapted to be engaged by said hook of the said screw.

2. In a screw-cutting device the combination of a casing, an annular disk mounted rotatably on the said casing and formed with slots, screw-cutting dies pivoted in the said casing, each of said dies being formed with a stud, these studs being respectively engaged in said slots, a projection on the said disk, a nut mounted rotatably on the said casing, a screw in the said nut, one end of the said screw constituting a hook for engaging the said projection, and a pivoted lever adapted to push the said hooked end of the said screw away from the said projection.

ANTOINE SIGALON. Vitnesses RAoUL ConoAs, EUGENE WA'ITERS.

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