US2899782A - Method of manufacture of packing - Google Patents

Description

Aug. 18, 1959 H. HAIDEGGER METHOD OF MANUFACTURE OF' PACKING original Filed March 1. 1954 FIGA FIGB

FIGJ

INVENTOR HANS HmnEER UnitedStates Patent C Baienled Ausf 18, 195.9

,2,899,732 METHOD on MANUFACTURE F PACKING HansHaideggr, Soleure, Switzerland, assignor to .Ebauches, QS.A., Neuchatel, Switzerland Original application March 1, 1954, Serial No. 413,330. 16),]igidgd and this application July 10, 1 957, Serial No.

3 claims. v(c1. ss-A-14) The present invention relates to a packing and to a method of manufacture'of same and this application is a division of my Aearlier application filed March 1, 1954 for Packing and Methodof Manufacturing Same, Serial No. 413,330. v l i Y One of the. objects of the invention is to provide packing which is readily provided with a partition member.

Another object of the invention is to provide a method of making a packing.

Another object of the invention is to provide a method of cutting and positioning of a partition member in a packing.

Other objects and advantages of the invention will be apparent from the following description and from the accompanying drawing.

The invention accordingly consists inthe features of construction, combinations of elements, and` arrangements of parts, all as will be illustratively described herein, and the scope of the application of which will be indicated in the following claims.

Other objects and advantages of the inventionwill be apparent from the following description and from Vthe accompanying drawing, which shows, by way of example, an embodiment of the invention.

In the drawing: A

Figure 1 is a perspective View of the packing.

Figure 2 is a top view of thepacking.

Figure 3 is a side view vat an enlarged scale of the packing made in accordance with the invention.

Figure 4 is a vertical sectional view taken` along the line 4-4 of Figure 2.

Figure 5 is a bottom view of the 4end male die for cutting a partition member or spacer of the packing from a sheet form,

Figure 6 is a view of the end male die-in direction of arrow A of Figure 5, and

Figure 7 a view of the end male die in direction of arrow B of Figure y5.

rene, although any other suitable plastic material such as Plexiglas, an acrylic plastic or other material might be used which does not evolve vapors during 4storage lor during a heat-sealing operation, rwhich does notfotherwise act so as to corrode or rust thestored parts. The body member 2 is molded'for instance by injection t a temperature for instance about between 135 and 150 centigrade, or drawn or pressed at a temperature for instance about between 100 and 170 centigrade to form a round flat bottom 5 between 8 and 16 millimeters in diameter. Sidewall 6 is inclined upwardly at an angle from 30 to 30 degrees from the vertical and is made of a height of about 6 to 1 2 millimeters. An annular flange 7 extends horizontally from the top edge of the sidewall 6 a distance` between 2 and 4 millimeters. Preferably the flange 7 is square in top view to facilitate storage in boxes. 5 The'body member 2 kis from 0.2 to 0.8 millimeters in thickness. The inner surfaceV of the sidewall 6 is made with a vertically extending cylindrical wall 8 extending IdQwIiv/,ardly between 1.0 and 4.0 millimeters'and 4ata right rangle to the flange 7. The body member 2 is thus 10 made with a cross-sectional shape in general bridge-truss design having great strength in proportion to the material used.

The partition member. or. Spacer 3 is preferably made .from Plexiglas, an acrylic plastic material, although' any other Vsuitable material such as for instance acetate foil, Celluloid etc. might be used which does not evolve vapors or otherwise act so as ,to corrode or rust the stored parts, .especially if the material is not heated.V The spacer 3 is `iliade from a sheet of Plexiglas between 0.1 and 0.4 millimeters in thickness and of a size to fit the vertically `extending wall 8 when the spacer is bulged outwardly or inwardly with a spherical radius between for instance 6i). ,and 300 millimeters. The slight bulging is given the .SRBCCI .3150 as to maintain it in position in engagement wiihthe Wall 8. The spacer 3-is cut from sheet form by pressing the sheet against the upper edge of the cylindrical wall 8 with a movable end male die 17 as shown ina-Figs. 5 to 7, using the upper edge of the wall 8 of the body ,2 as the female die. The end male die 17 has a cutting edge with four highest points 12. Each cutting edge portion 1 3 lyingbetween two adjacent points 12 is Shaped as curve (Figs. 6 and 7). The distanceb'etweenpoints 12 andthe lowermost points 16 of the curves 13, measured in Ythe axial direction of the die 17, is about 0.5 to 1 millimeter. The four edge portions 13 produce together with the upper edge of ythe'wall 8 a .shearing action on the sheet form; During this shearing yac tionthe spacer 3 is gradually bulged outwardly. The spacer -3 cut out in this way has in its fiat condition and in plan view ashape as shown in Fig. 8. It comprises .four points 14 with smallest distance from the spacer Center `vand four points 1S with largest distance from the spacer center. The diameter between opposite points I14 is only between about 0.1 and 0.2 millimeters smaller 45 than the diameter between opposite points 15. At the points 15 the pressure of the bulged spacer 3 against the -wall 8 is highest. It may happenthat the finished spacer 3 which has been bulged outwardly during shearing action may by the tensions occurring in it jerk fromthe outwardly to the inwardly bulged shape. The spacer`3 is apertured in its center portionas indicated at 9. The spacer `3 which is adapted to receive a balance or gear wheel on its upper surface with the shaft extending through the aperture yor opening 9 centers the balance or 55 ygear.Wheel kover the opening. The fabrication of the v vpartition member 3 by cutting it from a sheet of material is av considerable time-saving operation as the .handling and positioning by hand is a tedious and lengthy operation.' Furthermore'by this operation assurance is hadfthatfthe partition member will fit tightly inthe position set, which, of course, can be Varied .as desired by .adjustment ofthe strokeof'the male die. i y"The cover member 4 is preferably made of .paper of aweight v of ,approximately 250. grams per square meter lmdf a thickness bet'wfeen v,0.710and'0.5 Hm'illii'neters, preferably0.22`millimeter. The cover membeii'is'preferably square with rounded corners and between 10 and 40 millimeters on a side, and may be printed with the manufacturers name and identification of the stored parts. 70 The underside of the cover member 4 is coated with a solution of the same kind of polystyrene as used for the body 2 in a suitable solvent, or with a solution of acrylic plastic in styrene monomer or other suitable solvent so as to present a surface coating between 0.071 and 0.05 millimeter in thickness of polystyrene or acrylic plastic, and which will coalesce with the material of the body member 2. VThe coating may be applied by applying the plastic solution by a roller or by other usual methods. While it is preferable that the cover member be made of polymer capable of being printed may be used if the coating may be readily adhered thereto. The square shape has been chosen to provide the greatest space for the printing of trademark and other identiiication marks. By reason of the small size of the parts and of the packing, it will be noted that a problem is presented in providing ample space for the marking.

Preferably, after the watch part has been positioned inthe body member 2, the cover member -4 is placed in position and the assembly placed in a jig having an open-v ing to receive the cup-shaped portion thereof. Heat is applied from the upper side of the cover member 4 during preferably not more than three seconds at a pressure for' instance between l0 and 40 kilograms per square centimeter, preferably of 25 kilograms per square centimeter to the surface of the cover by a heated sealing member having a temperature for instance between about 180 and 220 centigrade, the sealing member comprising a plurality of spotting extensions each between 0.25 and 4 square millimeters in cross section and spaced between one and two millimeters and adapted to fuse or coalesce sealing points 10. Other methods of sealing the cover member in position may be used such as by applying a solvent to the coated surface of the cover member 4 f paper, any other suitable material such as for instance a and/or to the upper surface of the ange 7, allowing the solvent to partially evaporate, then placing the surfaces together and applying pressure and/or heat to coalesce the surfaces, but care should be taken not to use too much solvent as it may affect the stored parts. In order to permit breathing of the packing and to facilitate its opening, it should be noted that the spotting extensions preferably are so located as to leave unfastened portions 11 at the centers of the sides of the ange 7. The widths of the unfastened portions 11 are between two and live millimeters. By reason of the small spacing of the spot fastened areas, the cover member 4 is held close to the flange 7 providing a very narrow breathing space which is believed to have somewhat of a check valve action in resisting inward iiow of air yet readily permitting outward ow of air and vapor. The spaces are so small as to exclude dust and moisture particles. The spaces also provide easy access by a pair of tweezers or other small tool to the edge of the cover member 4 so that it may be torn away to remove the stored watch parts.

It should be noted that the coating on the underside of the cover member 4 reduces moisture vapor transmission as well as adding to the strength of the cover member. However, the absorbability of the outer surface of the cover member is not affected, thus, it readily receives printing ink or other marking. The firm attachment of the cover member 4 to the flange 7 of the body member 2 stiffens and adds to thestrength of the completed packing.

From the foregoing description it will be seen that a packing for watch parts has been provided in accordance with the invention which is light in weight, inexpensive in manufacture, and rugged in use, and which permits the merchandising of the watch parts in a practically tamper-free packing which may carry the trademark and part identification. The packing is dust and moisture resistant, and permits the necessary breathing to maintain the parts in good condition, the breathing spaces also conveniently providing for access by a tool for the easy opening of the package. Additionally, the square shape facilitates the grouping of the packings in boxes with the tops or cover members of opposite packings in contact. A pair of packings so positioned is able to support the weight of a man without collapse.

It is understood that the invention is independent of any theory which may be advanced to account for the results obtained. Thus, while the spaces or tear openings 11 are described as for breathingj it may be that the construction is such that only an outward flow of moisture vapor is permitted and that an inward flow of air is prevented by reason of a check valve action of the adjoining surfaces of the flange 7 and cover 4. In any event remarkable protection of the parts is achieved under moisture conditions, even as stated before, when the packing is immersed in water for short periods.

While the invention has been described and illustrated with reference to specific embodiments thereof it will be understood that other embodiments may be resorted to without departing from the invention. For example, while the anged top ofthe body member has been described Vas square in top view, it is apparent that other forms such as multi-sided shapes, or even around shape might be used. Therefore, the form of the invention set out above should be considered as illustrative and not as limiting the scope of the following claims. i

I claim:

-1. The method of cutting and positioning a partition member in a packing recess having a cylindrically-shaped wall comprising placing a sheet of material over a female die formed by the edge of said recess, moving a male die against the sheet of material shearing the partition-mem- Vber -from the sheet of material against the edge of the recess by further movement of the die, and positioning the partition member in the desired position in the recess by further movement of the die.

2. The mtehod of cutting and positioning a bulged partition member in a packing recess having a cylindri- Vcally-shaped wall comprising placing a sheet of material over a female die formed by said recess, providing a male die with cutting edge portions lying in a cylindrical surface and curved in moving direction of the male die, moving the male die against the sheet of material shearing the partition member with unequal ldiameter from the sheet of material against the edge of the recess by further movement of the male die, and positioning the partition member in the desired position in the recess by further movement of the male die.

3. The method of cutting and positioning a partition wall in a packing recess having a cylindrically-shaped wall comprising placing a sheet of material over a female die formed by said recess, providing a male 'die with curved `cutting edge portions each lying between two highest points and in a cylindrical surface, moving the male die againstthe sheet of material, gradually shearing the partition member from the sheet of material against the edge of the recess by beginning shearing with thesaid highest points by further movement of the male Ydie, and positioning the partition member in frictional condition in the desired position in the recess by further movement of the male die.

References Cited in the le of this patent UNITED STATES PATENTS

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