US1082590A - Chuck. - Google Patents

Description

J. HARTNESS.

CHUCK.

APPLICATION FILED PEB.20, 1913.

Patented Dec. 30, 1913.

2 SHEETSSHEET 1.

J. HARTNESS.

. CHUCK.

APPLICATION FILED rmmo, 191s.

Patented Dec. 30, 1913.

2 SHEETS-SHEET 2.

COLUMBIA PLANOGRAPH CO.,WASHINOTON. D. c.

JAMES HARTNESS, OF SPRINGFIELD, VERMONT.

CHUCK.

Specification of Letters Patent.

Patented Dec. 30, 1913.

Application filed February 20, 1913. Serial No. 749,631.

To all whom it may concern Be it known that I, J AMES HARrNnss, a citizen of the United States, and a resident of Springfield, in the county of "Windsor and State of Vermont, have invented certain new and useful Improvements in Chucks, of which the following is a specification.

This invention has relation to chucks and more particularly to scroll chucks, socalled, in which the radially movable jaws are moved in guideways in the body of the chuck by a scroll engaging one or more teeth or projections in the rear portions of the aws.

The invention consists in constructing the body in sections so spaced apart as to form equally spaced guideways for the jaws. These sections are approximately sectorshaped and may be adjusted so as to provide for a varying number of jaws, so that, if desired, a chuck may be equipped with three jaws or with four jaws according to the character of the work to be operated on, or according to the desire of the operator.

In furnishing a chuck, there are provided a plurality of body sections and a plurality of spacers. The sections are made in pairs and each section of the pair is formed on its outer side to constitute one wall of a guideway for the jaw, so that, when two adjacent sections of two pairs are properly placed and spaced apart, they form a guideway between them in which the aw may be operated by the scroll.

Referring to the accompanying drawings, Figure 1 represents a front elevation of a chuck embodying the invention, provided with four jaws. Fig. 2 represents a section on the line 2-2 of Fig. 1. Fig. 3 represents a side elevation of the chuck. Fig. represents a section on the line H of 1. Fig. 5 represents a section on the l1ne 55 of Fig. 1. Fig. 6 shows one of the body sections detached. Fig. 7 represents a front elevation of the same chuck arranged to receive three jaws. Fig. 8 represents a section on the line 88 of Fig. 7. Fig. 9 shows a front elevation of the chuck with the body removed. Fig. 10 represents a section on the line l010 of Fig. 8. Fig. 11 represents a side elevation of the chuck. Fig. 12 represents one of the spacers detached.

Referring to the drawings,20 indicates the back-plate of the chuck which is formed with a hub 21 internallythreaded so as to screw upon the end of a hollow spindle 22.

This back-plate might, if desired, be formed integrally with the spindle. In the face of the back-plate, there is an annular groove 23 to receive the jaw-operating scroll 24. Loosely mounted on the hub 21 of the backplate, there is a gear-operating scroll 25 having a rearwardly extending marginal flange 26 formed by cutting a groove 27. A. clamp-brake, such as illustrated in my copending application Serial No. 722,962, filed September 28, 1912, may be used to clamp the flange 26 and hold the scroll 25 against rotation. Preferably the back-plate and the rear scroll 25 are equal in external diameter. The back-plate 20 serves as a support for one or more spiral gears 28 (see Fig. 9). The axes of these gears are tangential to a circle circumscribed about the axis of the back-plate and they are preferably equidistant as shown. The said gears are loosely mounted on smooth portions of screw pins 29 which are passed into sockets formed in the back-plate, the gears themselves being located in recesses extending through the web of the back-plate as shown in Fig. 5. The arrangement of the gears is such that they intermesh with the scroll teeth 30 formed on the front face of the rear scroll 25, and also intermesh with rack teeth 31 formed on the rear face of the aw-operat-ing scroll 24. Nhen the chuck is quiescent, the rotation of the rear scroll causes the rotation of the jaw-operating scroll (and the actuation of the jaws) through the medium of the interposed ower-transmitting mechanism, which in t is case consists of one or more of the spiral gears 28. When the chuck is in rotation, the rear scroll may be retarded so as to cause a similar movement of the jaw-operating scroll. Ordinarily the back-plate and the scroll 25 rotate in unison. The rear scroll is held against axial movement by a collar 32 detachably secured by any suitable means such as a screw 38 and pin 34: to the hub 21 of the back-plate. In general, the parts which I have described correspond to those which are illustrated in my application to which I have previously made reference.

The body of the chuck in the present case consists of a plurality of sections which may be located in various positions to form guideways for various numbers of jaws. In Fig. 1, there are four jaws which are indicated at 40, 41, 42 and 43. In this case, i

usual shoulders as shown in Figs. 2 and 8.

The parallel side faces of each jaw are formed with tongues and grooves as shown in Figs. 3, 4L and 11.

In Fig. 1, the body of the chuck is shown as comprising eight sections a, b, 0, (Z, 6, f, g and it. They are arranged in pairs at Z), 0 (Z, etc., the inner faces of the sections of each pair abutting and the outer faces of the sections of each pair being provided with tongues and grooves complemental to those formed in the jaws. In Fig. l, the four pairs of sections are arranged to provide for radial grooves to receive the four jaws. Each section is secured to the rear plate by a plurality of screws or like fastenings. Viewed in front elevation, the screws are arranged in two circles, one series of screws being located near the outer margins of the sections and the other screws being located near their inner ends. There are two of the outer screws 44 and one inner screw 45 for each section. For the purpose of enabling an adjustment'of the sections to provide for a smaller number of jaws, I furnish with each chuck a plurality of spacers 7c, of which one is shown in Fig. 12. Each spacer is adapted to be placed between the sections of a pair of sections so as to spread them apart. The side faces of each spacer are at approximately an angle of 80, so that, when a. spacer is placed between the sections of a pair, the outer faces of the pair will be changed from an angle of 90 to an angle of 120, thus making provision for the employment of only three jaws instead of four. For the purpose of changing over the chuck from four jaws to three jaws, all of the sections shown in Fig. 1 are removed except those indicated at a and 71 Then two spacers 7c are secured in place adjacent the remaining sections a and h. Then the two sections 6 and g are neXt secured in place in the positions shown in Fig. 7 The sections a and d, with the spacer is between them, are then secured to the back-plate, so that as a result three radial guideways are provided for the three jaws 40, ll and .12. Thus the two sections 0 f and the jaw i3 are temporarily laid aside until it is desired to transform the chuck again into a four-j awed chuck. The back-plate is provided with a proper number of properly spaced apertures to receive the fastening screws 44 and 45 for the sections and also with apertures to receive fastening screws 46 and a7 which secure the spacers to the back-plate.

So far as I am aware, I am the first to have provided a chuck comprising a back plate and a body formed of a plurality of sections adjustable to form a varying number of guideways for the jaws. I might, of course, omit the section spacers altogether, but I prefer to use them as they stiffen the body and hold the sections of each pair rigidly in their proper positions.

Having thus explained the nature of my said invention and described a way of making and using the same, although withoutattempting to set forth all of the forms in which it may be made or all of the modes of its use, what I claim is:

1. A scroll chuck comprising a jaw-operating scroll, a plurality of radial jaws, a back-plate, and a body consisting of a plurality of sections secured to said back-plate, said sections being spaced to form guideways for said jaws.

2. A scroll chuck comprising a plurality of radial jaws, a jaw-operating scroll, a back-plate, and a body attached to the backplate and consisting of a plurality of pairs of sections, said pairs being separated to form guid-eways for the jaws.

3. A scroll chuck comprising a plurality of radial jaws, a jaw-operating scroll, a backplate, and a body attached to the back-plate and consisting of a plurality of sections, said sections being adjustable to provide a varying number of equally spaced guideways for receiving an equal number of jaws.

t. A scroll chuck comprising a jaw-operating scroll, and a back-plate, of a plurality of radial jaws, and a detachable body, said body consisting of a plurality of pairs of sections separated to form guideways for the jaws, and secured independently of each other .to the back-plate.

5. A chuck comprising a back-plate, jawoperating mechanism, a plurality of jaws, a body consisting of a plurality of adjustable sector-shaped sections spaced to form guideways for the jaws, said back-plate having provisions for receiving a variable number of sections to accommodate a variable number of jaws.

6. A chuck comprising a back-plate, jawoperating mechanism, and a body consisting of a series of independent sections spaced to form radial guideways for the jaws, said sections being adapted to be adjusted to *ary the number of such guideways, and means for securing said sections to the backplate in the positions to which they may be adjusted.

7. A chuck comprising a back-plate and a sectional body detachably secured thereto, the sections being adapted to be equally spaced in different positions to receive either three or four jaws.

8. A chuck comprising a back-plate, a jaw-operating scroll, and a body consisting of a series of pairs of detachable sectorshaped sections spaced apart to form radial jaw-receiving gnideways, and a. sectorshaped spacer between the sections of each pair, said spacers being removable, the sections of said pair being adapted to be closed together, and said pairs to be adjusted,

whereby space is made for an additional 10 pair of sections, and for an additional guide- Way for an additional jaw.

In testimony whereof I have aflixed my signature, in presence of two Witnesses.

. JAMES HARTNESS. Witnesses:

RALPH E. FLANDnRs,

J. W. WALKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents. Washington, D. 0.

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