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Publication numberUS1875143 A
Publication typeGrant
Publication dateAug 30, 1932
Filing dateAug 18, 1931
Priority dateAug 18, 1931
Publication numberUS 1875143 A, US 1875143A, US-A-1875143, US1875143 A, US1875143A
InventorsPunton Charles W
Original AssigneeMine Safety Appliances Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Protective cap
US 1875143 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


This invention relates to protective caps for use by miners and others engaged in occupations where the head is endangered.

The headgear commonly worn by miners and those engaged in similar occupations generally consists of a cap embodying conventional crown and visor portions formed from leather, fibre, canvas, and the like to provide a relatively sti structure. These caps are intended to oder more or less re sistance to impact, so as to protect the wearers head from damage by falling objects. However, the caps used up to the time of this invention have been subject to serious disadvantages inherent in their construction. F or instance, the stiff edge or periphery of the crown portion of the cap has been more or less sharp and of substantially the saine thickness as the balance of the crown, so that impact upon the cap, as by falling rock or coal, drives this sharp edge against the ears, injuring, or in some instances even severing them. Moreover, the materials used heretofore for this purpose become softened by moisture, or under heat, and are otherwise damaged in use, thus materially decreasing their efficiency.

It is among the objects of this invention to provide protective caps which are strong and rigid, are resistant to the action of moisture, mine acids, and heat, adapted to resist severe impact without injury to the wearer, of simple construction, are readily made, and embody advantages of prior caps while eliminating or minimizing injury to the ears.

A special object is to provide caps of the type referred to which are capable of preventing electric shock when the cap contacts with live electric conductors.

The invention may be described in connection with the accompanying drawings, in which Fig. l is a longitudinal section through one embodiment of the cap, taken on line I-I, Fig. 2; Figs. 2 and 3 bottom plan and front elevational views, respectively, of the cap shown in Fig. l; Fig. 4 a fragmentary longitudinal section through the upper crown portion of a modified construction; Fig. 5 a cross section through an insulated rivet; Fig. 6 a fragmentary cross Serial No. 557,758.

section on an enlarged scale through another embodiment, showing a reinforced construction; Fig. 7 a fragmentary longitudinal section through 'a cap showing another form of lamp holder; Fig. 8 a view similar to Fig. 7 showing a modified lamp holder molded integrally with the cap; Figs. 9 and l0 front elevation and plan views, respectively, of the holder shown in F ig. 8; and Figs. 11 to 18 views similar to Figs. 8 to 10 showing another form of integrally molded lamp holder.

In accordance with the invention caps embodying its stated objects are made by molding them integrally from a plastic adapted to provide arigid, strong, hard and nonconducting structure, and by providing their lower edge with means for preventing injury to the ears. In accordance with the invention ear protection is afforded by providing the edge of the crown with a narrow outwardly extending flange, or bead. The caps thus provided are rigid, strong and durable, and they eliminate the danger of electric shock by contact of the head with exposed electrical conductors. In particular, they overcome the disadvantage of prior caps as regards ear injuries, for upon impact on the cap the bead does not cut, but tends to slide over, the ears. Other advantages presently to be pointed out, are also attained.

Although protection to the ears may be had by providing a narrow flange on the edges of the crown overlying the ears, it is preferred to extend it continuously around the periphery of the cap and to make its section greater than that of the crown portion. In this manner the cap is strengthened and reinforced against damage due to shock, and most suitably this result is enhanced by molding a reinforcing element in the bead. The crown may be, and preferably is, also reinforced against shock by molding into it a formable reinforcing element, such as duck or wire screen.

Various plastics may be used satisfactorily in the practice of the invention. For eX- ample, the caps may be made from beaten pulp, such as paper p rgwggdpulp) which can be molded in a press to providemhard and vio strong structures satisfying the requirements of such caps. The addition of sizing or bonding material, as is customary, materially assists in using such beaten pulp. Other moldable materials may be used, but it is preferred to use plastics of the type comprising organic condensation products, such as those coinmonly referred to as synthetic resins. Materials of this class are initially-plastic and moldable, but after being subjected to appropriate heat and pressure they become very hard, infusible, non-conducting, and insoluble in most solvents, dilute acids and alkalis. The material preferably used is that resulting from condensation of phenol and formaldehyde, and for the best results the plastic comprises condensation products mixed with a more or less finely divided binder, such as chopped duck or the like. Or, if desired, the beaten pulp referred to may be impregnated with these materials. All such materials are termed plastics7 herein, for brevity of reference.

Having reference now to the drawings, the cap shown in Figs. 1 to 3 comprises a molded structure having a dome-shaped crown portion 1 extended at one end to form a visor 2. The periphery of the cap is provided with a continuous outwardly extending iange or bead 3 of substantially greater section than that of the crown. Preferably the outer, or upper, surface of the flange is continuous with the crown, the lower portion being thickened to provide the bulbous thickening shown. This provides a reinforcing bead which is especially suited for the purposes of the invention. In order further to reinforce this portion of the cap, there is preferably molded in the bead a reinforcing element 3a. Hemp rope has been found to be suitable for this purpose.

For most purposes the crown portion of the cap is also reinforced by a suitable material molded in the crown, as by a single layer of reinforcing screen 4, Fig. l, totally embedded in the ytop of the crown. Experience has shown that there may be a tendency for the screen to ,become displaced toward the lower surface of the crown in the molding operation. This may be overcome by using a reinforcing element comprising a plurality ofv layers, such as a screen supported by paper. A single layer of paper arranged between the screen and the inner surface of the crown may be used, but as shown in Fig. 4l screen lla is preferably sandwiched between layers 5 of paper, this element being molded in the top of crown la. With caps of ordinary size a circle of screen about 6 inches in diameter sulficiently reinforces the structure. While other materia-ls may be used for this purpose, screen is desirable because it is readily shaped in molding, the wires slipping to assume the proper shape.

Although caps reinforced in this manner will be satisfactory for many purposes, greater strength, or resistance to breakage, is obtained by further reinforcing the crown. To this end a formable material, such as duck is molded in the crown. Substantial improvement in strength is obtained by molding a ring of duck in the crown adjacent the bead, but the most satisfactory results are had by the use of one or more layers 6, Fig. 6, of duck or the like extending from the edge substantially to screen 4.-

The caps are made by placing a layer of suitable plastic, such as phenol-formaldehyde condensation product mixed with chopped duck, in an appropriate mold. The reinforcing element or elements, as the case may be, are then disposed appropriately in the mold and covered by the balance of the plastic.' .Upon heating and pressing in the manner customary with such materials the cap is formed' and assumes the properties characteristic of these materials.

A feature of this invention resides in the provision of a head band which is removable and adjustable to the heads of different wearers. The formshown comprises a sweat band 7 'of cloth,t or other suitable material,l

disposed within and spaced from crown v1 by spaced cushioning pads Zatarranged at intervals` between the band and the crown.

The band is bent under the back of thev pads, i

as shown in Fig. l, and the structure is held removably in the crown by means of a nonmetallic draw member 8 laced through holes 9 spaced around the crown and in the band and pads. The body of the sweat band is cut as shown in Figs. l and 2 to form a plurality of flaps l() gathered at the top by a draw string 11 to form a lining, shown best in Fig. l.

The sweat band thus provided is readily removable for replacement, and the size and shape of the head-receiving opening defined by it may be changed readily. Thus, by using thinner or thicker pads the area of the opening may be changed, or by appropriately positioning thick and thin pads its shape may be altered according to need. A par- Y ticular advantage of this structure is that 'ventilation is assured by the spaces 12 between the ends of the pads, which provide for free circulation of air inside of the crown.

Where'the caps are used by miners and for similar purposes they are provided with lamp holders associated with the crown above the visor. These holders may assume a variety of forms, and they may be either attached to the caps after they are formed, or molded integrally with them. The holder shown in Figs. l to 3 comprises a strip 14: of stiff leather or the like having outwardly projecting ears at its upper end connected to the crown by rivets l5, and folded upon itself and connected at its lower end to the as the flat hook carbide type.

visor by means of rivets 16. A strip of metal 17 provided with an outwardly offset portion 18 for reception of a lamp is riveted to the upper part of the holder, as shown in Figs. 1 and 3.

The plastic used in these caps is a non-conductor so that should the cap contact with an exposed trolley wire or the like the current will not be carried to the wearer. In order to eliminate the possibility of conduction of electric current to the head by rivets extending through the crown, rivets are of an insulated type. These may be formed readily by embedding the head of an ordinary rivet, Fig. 5, in plastic 15a, such as phenol-formaldehyde condensation product. The rivet is inserted from the outside through appropriate holes in the crown and strip 14, and, the embedded head being held in a suitable tool, the free end is upset within -the crown. Rivets 16 used in the visor need not be of this non-conducting type because at this point of the cap there is substantially no possibility of contact of the inner end of the rivet with the wearer.

vthat shown in Fig. 3. f

The holders may also be molded integrally with the cap, as shown in Figs. 8 to 10. The crown 1c of this embodiment is molded with a projection 22 overlying the visor portion and having a recess 23, Fig. 9, in its lower end for reception of a metallic plate 24, Fig. 10, for holding lamps of the fiat hook carbide or a common form of electric miners types, the

.bracket of the lamp being inserted between plate 24 and a recess 25 formed rearwardly thereof. In order to render the holder adapted to receive other standard types of lamp, its upper portion is provided, as shown in Figs. 9 and 10, with a deep recess 26 having spaced grooves 27 for receiving the hooks or clamps of various types of carbide and electric cap lamps.

Still another form of holder is shown in Figs. 11 to 13. This comprises a molded plastic block 28 attached to thev crown 1d by "f means of insulated rivets 29. Like the holder shown in Figs. 8 to 10, this one is adapted to hold a variety of lamps. A metal strip 30 is riveted in a recess 31, and a narrower deeper recess 32 receives the brackets of lamps such Holes 33. extending downwardly into the holder are provided for round hook lamps.

In addition to providing maximum protection to the ears when struck a downward blow, the caps are strong, durable, light and comfortable to wear. The Visors are also strong and resistant to deformation or breakage, and to damage by mine water and other liquids. Being integral with the crown it is held in fixed position. Thus it affords protection to the face and eyes and helps to hold lamps and goggles in fixed position, and so to get the most satisfactory results from such accessory equipment. These are substantial advantages over the leather or canvas Visors used heretofore, which become loosened, or broken down.

The cushioned adjustable head-band reduces pressure on the head and insures ventilation. It also makes it possible to manufacture but a few sizes, because thebands are readily adjustable to alter the size and shape of the opening. The caps withstand very severe impact without injury, are not affected by heat, moisture or mine acids, effectively protect the wearer from electrical shock, and are not flammable.

According to the provisions of the patent statutes, I have explained the principle and construction of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specilically illustrated and described.

I claim:

1. A safety cap comprising integral rigid crown and visor portions formed of hard,

non-conducting molded plastic and provided l around their outer edge with an outwardly extending strengthening and ear-protective bead having a reinforcing element molded therein, and the crown containing a reinforcing element embedded in said plastic to strengthen the crown against breakage.

2. A safety cap comprising integrally molded rigid crown and visor portions formed of hard, non-conducting molded plastic, the edge of said crown portion adjacent the ears being provided with an integrally formed ear-protective bead, and the upper portion of said crown being reinforced by a wire screen embedded in said plastic.

3. A safety cap comprising integral rigid crown and visor portions formed of hard, non-conducting molded plastic, said portions being provided around the edge with an outwardly extending strengthening and ear-protective bead, and the upper portion of the crown having embedded therein a reinforcing element composed of layers of wire screen and paper.

4. A safety cap formed of a hard, non-conducting molded plastic of the organic condensation product type, the cap comprising integrally molded rigid crown and visor portions, a strengthening and ear-protective continuous bead of substantially heavier section than said portions integral with and extending outwardly from the periphery of the cap, a wire screen reinforcement embedded in said plastic in the upper portion of said crown, and a reinforcing element integrally molded in said 5 bead.

5. A safety cap formed of a hard, non-conducting molded plastic, the cap comprising a rigid molded crown portion extended forward at one end to form a visor and provided .lo peripherally with an integral narrow outwardly projecting flange of substantially heavier section than said crown, a rope reinforcing element molded in said flange, a wire scre-en embedded in said plastic in the upper.

l5 part of said crown, and a lamp holder molded integrally in said crown above said visor.

6. A safety cap comprising molded rigid crown and visor portions provided peripherally with an integral narrow outwardly projecting flange of substantially heavier section than said portions, the cap being formed of a hard, non-conducting molded plastic of the condensation product type, the upper portion of the crown being reinforced by a strengthening element comprising y layers of wire screen and paper embedded in said plastic, said flange having a reinforcing element molded therein, and a lamp holder associated with the crown above said visor.

7. A safety cap formed of hard, non-conducting molded plastic, the cap comprising integrally molded rigid crown and visor portions provided around their outer edge with an outwardly extending strengthening and ear-protective bead, the crown being reinforced in its upper portion and adjacent said bead portion by woven fabric reinforcing elej ments moldably embedded in said crown portions, and a sweat band replaceably disposed in said crown andv adjustable to vary the size of its head-engaging opening.

In testimony whereof, I sign my name.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2418069 *Mar 24, 1943Mar 25, 1947Richard Delano IncHead gear
US2445355 *Jan 28, 1946Jul 20, 1948Hansford D HurtHeadgear for optical devices
US2557123 *Aug 6, 1945Jun 19, 1951Albert Lyon GeorgeHelmet
US2739311 *Jul 5, 1952Mar 27, 1956Bullard CoSafety cap
US2870445 *Oct 28, 1954Jan 27, 1959Mine Safety Appliances CoProtective headgear and lining suspensions
US2895137 *Aug 6, 1956Jul 21, 1959Electric Storage Battery CoMiner's lamp bracket
US2926356 *Jan 3, 1958Mar 1, 1960James P TaylorBeanproof cap for baseball, racing and allied sports
US2931042 *Apr 27, 1954Apr 5, 1960Mine Safety Appliances CoProtective headgear and method of making it
US3082427 *May 19, 1960Mar 26, 1963Joseph Buegeleisen CompanySafety helmet
US3122751 *Oct 2, 1961Mar 3, 1964Jordan Robert DTridynamic helmet suspension system
US3213463 *Feb 19, 1964Oct 26, 1965Joseph Buegeleisen CoSafety helmet and headband therefor
US5099523 *Jan 25, 1991Mar 31, 1992Bell Bicycles, Inc.Reinforced expanded plastic helmet construction
US5119516 *Oct 25, 1989Jun 9, 1992Bell Sports, Inc.Reinforced expanded plastic helmet construction
US5269025 *Oct 15, 1991Dec 14, 1993Bell Bicycles, Inc.Reinforced expanded plastic helmet construction
US5477563 *Oct 21, 1993Dec 26, 1995Giro Sport Design, Inc.Helmet having a planar-molded infrastructure
US8464362 *Aug 13, 2004Jun 18, 2013Mine Safety Appliances CompanyProtective helmets and method of manufacture thereof
US20060031975 *Aug 13, 2004Feb 16, 2006Hersick F JProtective helmets and method of manufacture thereof
EP1688053A1 *Feb 1, 2006Aug 9, 2006Manfred KrauterShell for a sport and leisure activity helmet
U.S. Classification2/412, 362/106, D29/104
International ClassificationA42B3/04, A42B3/06
Cooperative ClassificationA42B3/06
European ClassificationA42B3/06