US1390302A - Mandrel - Google Patents

Description

H. F. MARANVILLE.

MANDREL.

APPLICATION FILED own, 1919.

LSQUfiQQ. .Patentedgept- 13, 1921..

HARVEY F. MARANVILLE, 0F AKRON, OHIO, ASSIGNOR TO THE MILLER RUBB 00M- PANY, 0F AKRON, OHIO, A CORPORATION 01E OHIO.

MANDREL.

Specification of Letters Patent. ll gmignt-gdl te t, 13 1921 Application filed December 11, 1919. aerial No. 344,130.

To all whom it may concern.

Be it known that l, HARVEY F. MARAN- VILLE, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Mandrels, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings. v This invention relates to mandrels for use in making pneumatic tires and certain parts and adjuncts thereof such as inner tubes and air bags. These tubular rubber members are first molded, and sometimes cured also, upon a circular metal ring and then removed and their ends suitably joined together. The objects of the present invention are the provision of a mandrel for this purpose of new and improved construction and having peculiar provisions for facilitating the removal of the formed article; the provision of a mandrel of uniform and complete circular shape, adapted for machine operation, and capable of being separated in a new and better way to enable the removal of the tubular rubber part; the provision of new and improved means for securing together and operating the parts of a tube mandrel; the provision of new and improved expedients for removing the tube; while further objects and advantages of the invention wili become apparent as the description proceeds.

In the drawings accompanying and forming a part of the specification I have illustrated certain embodiments of my said invention, although it will be understood that my inventive idea is capable of use in a large number of different physical constructions wherefore I do not limit myself to the details of construction and arrangements shown herein except as the same are recited in my claims. In these drawings Figure 1 is a side view of a complete mandrel embodying my improvements; Fig. 2 is a vertical sectional view of the mandrel illustrated in Fig. 1 showing the two parts thereof displaced relatively to each other; Fig. 3 is a-detail sideelevation of the swinging ends of the man drel; Fig. 4 is a longitudinal sectional view of the opposite ends showing the hinge; and Fig. 5 is a sectional view on the line 5-5 of Fig. 4 looking in the direction of the arrows; Fig. 6 shows a modified construction of the swinging ends, and Fig. 7 illustrates a complete mandrel embodying this modification.

Describing the parts by reference characters, my lmproved mandrel consists of a torus-shaped body made in two parts, 1, 2, of substantially equal angular extent, hinged together at one end and detachably connect ed at the opposite end. Each segment is hollow and has its ends closed by plugs 3-3 and transverse webs 4-4 respectively. The plugs -3 are formed with alined circular apertures for the reception of a securing bolt 5 which is here shown as provided with two removable heads 6-6, secured to the bolt by drift pins 7-7. In the present em bodiment T have shown the plugs as rigidly secured in place by radial screws 8, 8, which maybe reinforced by (or substituted'with) brazing or other securing means. When made in this manner the two plugs are secured together upon the bolt prior to their insertion in the mandrel sections.

As a result of this construction the two members of the mandrel can be moved relatively to each other about this bolt as an axis as shown in.

Fig. 2.

The webs 4-4 are provided with cooperating tongue and groove, shown in Figs. 1, 2, and 3 as of dove-tail shape and indicated at 11 and 12 respectively, the same being curved on an arc of which the bolt 5 is the center. The wall of each segment is also preferably formed with a number of air escape apertures 1515 so that by admitting compressed air to the interior of the mandrel the rubber member thereon can be forced out of contact therewith and its removal facilitated. Suitable means are provided for admitting such compressed air to the mandrel interior such as forming one of the members adjacent to the swinging end with a threaded aperture 16, here shown as formed in one of the webs 4 but not restricted to that location. In order to permit such compressed air to pass through the other member the bolt 5 is formed with a longitudinal bore 17.

In Figs. 1 and 3 the swinging ends are cut on a plane parallel to the radius at that point, but this is not essential and in Figs. 6 and 7 I have shown the ends as inclined. Also I have shownlthe tongue and groove as flat sided instead of undercut. Also I have shown the parts as provided with mechanical means for maintaining them in alinement, the same here consisting of a spring pressed bolt 16 carried in one member and having a rounded head adapted to engage a suitable socket in the other member. In this view I have-shown the air inlet aperture at 18.

In use the ends of the mandrel are brought to the same plane as shown in Figs. 1 and 3, and the rubber fabric, and other components are applied thereto in the usual manner either by hand or by machine, and if desired some or all of the curing is performed. The tube may either be built unbroken across the swinging ends or it may be discontinued at this point, although in the former case it is necessary to sever the same before the mandrel can be opened; and in either case, when it is desired to remove the tube, the parts are displaced as shown in Figs. 2 and 7 and compressed air admitted to the mandrel interior which frees the tube from adhesion and permits it to be drawn readily therefrom.

Nhile there are advantages in having the pivot axis coaxial with the sections at the point of attachment my invention is not limited to this; also while there are advantages in having the two segments of equal length, a perfectly operative and highly valuable device can be made with unequal sections; also many other changes in detail can be made within the scope of my inventive idea, especially in the mode of hinging the hinged ends and in guiding and holding the swinging ends, and I do not restrict myself in any way except as recited in the claims hereto annexed. While it have mentioned both tubes and air bags I have devised this construction more especially for use in making air bags as commonly used in the process of making cord tires.

Having thus described my invention, what I claim is 1. A tube or air bag mandrel for use in pneumatic tire manufacture comprising an annular body made in two segments which are pivoted together at one end to swing laterally.

2. A tube or air bag mandrel for use in pneumatic tire manufacture comprising an annular body made in two segments which are pivoted together at one end and det-aclr ably connected together at the opposite end.

3. A tube or air bag mandrel for use in pneumatic tire manufacture comprising an annular body made in two segments which are pivoted together at one end upon an axis substantially concentric with the section of the torusat that point.

4. A. tube or air bag mandrel for use in pneumatic tire manufacture comprising an annular body made in two substantially equal segments which are pivoted together.

5. A. tube or air bag mandrel comprising an annular body made in two segments which are pivoted together at one end upon an axis substantially concentric with the section of the torus at that point and are formed with interfitting tongue and groove provisions at the other end concentric with such binge.

(3. A tube or air bag mandrel comprising an annular body made in two substantially equal segments which are pivoted together at one end and are formed with interfitting dove tailed tongue and groove provisions at the other end concentric with the hinge axis, and means for holding the last named ends in alinement.

7. An annular two piece mandrel made of hollow members of substantially equal angu lar extent having end closures, two of said closures being apertured for the reception of a pivot bolt, a bolt in said aperture and having at least one removable head, and means including a pin for securing said head to the bolt.

8. An annular two piece mandrel made of hollow members having end closures, two of said closures being adapted for the reception of a pivot bolt, a bolt therefor, and the other closures having interlitting parts adapted to cooperate with said bolt to hold said members together.

9. An annular mandrel comprising two hollow body members of substantially equal angular extent, and pivoted together at one end upon an axis within the limits of the body members.

10. An annular mandrel comprising two hollow body members of substantially equal angular extent, and pivoted together at one end upon an axis within the limits of the body members, the walls of said members being formed with air escape perforations, and one of said members being formed with an air admission aperture, the pivot means comprising an air conduit between one member and the other.

11. An annular mandrel comprising a plurality of hollow members movably connected together and having perforated walls, one of said members having an air admission aperture and the connecting means between the members comprising air conduit provisions.

12. A tube or air bag mandrel for pneumatictire manufacture comprising a plurality of hollow sections movably secured together end to end and having perforated sides.

13. A circular tube mandrel comprising a hollow body having perforated sides and an inlet aperture for compressed air.

In testimony whereof, I hereunto affix my signature.

HARVEY F. MARANVILLE.

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