CA1036751A - Ear protecting device for safety caps - Google Patents
Ear protecting device for safety capsInfo
- Publication number
- CA1036751A CA1036751A CA295,155A CA295155A CA1036751A CA 1036751 A CA1036751 A CA 1036751A CA 295155 A CA295155 A CA 295155A CA 1036751 A CA1036751 A CA 1036751A
- Authority
- CA
- Canada
- Prior art keywords
- arm
- ear
- arms
- protecting device
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 210000005069 ears Anatomy 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- NSMXQKNUPPXBRG-SECBINFHSA-N (R)-lisofylline Chemical compound O=C1N(CCCC[C@H](O)C)C(=O)N(C)C2=C1N(C)C=N2 NSMXQKNUPPXBRG-SECBINFHSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/16—Ear protection devices
- A42B3/166—Integral hearing protection
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Helmets And Other Head Coverings (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A pair of spring arms in the form of flat resilient strips have upper ends formed for connection to the opposite sides of a safety cap. The upper portions of these arms are substantially parallel, but their lower portions normally slope downwardly toward each other from the lower ends of the upper portions, the downwardly sloping portion of each arm tapering in thickness and width toward its lower end and being provided with a central longitudinal slot slidably and rotatably receiv-ing a headed retaining pin projecting from the back of an ear cover.
A pair of spring arms in the form of flat resilient strips have upper ends formed for connection to the opposite sides of a safety cap. The upper portions of these arms are substantially parallel, but their lower portions normally slope downwardly toward each other from the lower ends of the upper portions, the downwardly sloping portion of each arm tapering in thickness and width toward its lower end and being provided with a central longitudinal slot slidably and rotatably receiv-ing a headed retaining pin projecting from the back of an ear cover.
Description
103675~
This invention relates to ear protecting devices, and more particularly to such devices formed for detachable connec-tion to safety capsO This application is a division of our co-pending application, Serial NoO 225,714, filed April 29, 19750 It is old to mount a face shield on headgear to form an assembly that includes a band extending around the crown of a safety cap and supporting brackets at its opposite sides that hook onto the lower edge of the capO The brackets support bolts on which the opposite sides of a face shield are mountedO This shield is held in its upper or lower po~ition by nuts screwed on the outer ends of the boltsO
It is among the ob~ects of this invention to provide an assembly similar to the one ~ust described, but which can also support covers for the ears to protect them from undesirable noise, which permits either the shield or the ear covers to be removet when desired, and which exerts substantially the same pressure against the ear covers regardless of head size~0 The preferred embodiment of the invention is illustrated in the accompanying drawings, in which Figc 1 is a front view;
Figo 2 is a side view;
Figo 3 is a fragmentary plan view;
Figo 4 is an enlarged fragmentary vertical section; and Figo 5 is a vertical section taken on the line V-V of Fig. 4.
Referring to the drawings, a relatively stiff but some-what flexible band extends around the lower portion of the crown
This invention relates to ear protecting devices, and more particularly to such devices formed for detachable connec-tion to safety capsO This application is a division of our co-pending application, Serial NoO 225,714, filed April 29, 19750 It is old to mount a face shield on headgear to form an assembly that includes a band extending around the crown of a safety cap and supporting brackets at its opposite sides that hook onto the lower edge of the capO The brackets support bolts on which the opposite sides of a face shield are mountedO This shield is held in its upper or lower po~ition by nuts screwed on the outer ends of the boltsO
It is among the ob~ects of this invention to provide an assembly similar to the one ~ust described, but which can also support covers for the ears to protect them from undesirable noise, which permits either the shield or the ear covers to be removet when desired, and which exerts substantially the same pressure against the ear covers regardless of head size~0 The preferred embodiment of the invention is illustrated in the accompanying drawings, in which Figc 1 is a front view;
Figo 2 is a side view;
Figo 3 is a fragmentary plan view;
Figo 4 is an enlarged fragmentary vertical section; and Figo 5 is a vertical section taken on the line V-V of Fig. 4.
Referring to the drawings, a relatively stiff but some-what flexible band extends around the lower portion of the crown
-2~
~ .036751 of a safety cap lo This 6and may be ccmposed of a strip 2 of plastic, the ends of which are connected by resilient tube 3 cemented to themO The tube can be stretched lengthwise as the band is pressed down,over the cap crown so that the band will snugly engage the cap for most of its cixcumference.
At opposite sides of the cap, brackets 5 are slidably moùnted on the bandO The opposite sides of the central portion of each bracket are provided with slots 6, ehrough which the band extendsO To prevent the bracket from accidentally sliding along the band, the outer surface of the bandat its opposite sides is provided with a number of laterally spaced vertical ribs 7, between which a pair of similar ribs ~ on the inner ~urface of the bracket normally pro3ect as shown in dotted lines in Figo 50 By temporarily straightening the normally curved section of the band that extends through the bracket, the ribs on the band will be withdrawn from the bracket ribs so that the bracket can be ad~usted lengthwise along the bandO
Integral with each bracket is a hook 9 that extends downwardly and hooks under the edge of the narrow side brim of the safety cap to prevent the band fram riding up on the capO
Each bracket 5 also extends up above the band and is provided above it with an opening 10 (Figso 4 and 5)~ the axis of which extends substantially radially of the bandO Encircling the outer end of this opening and integral with the bracket is a cylindrical flange 11. A bolt 12 extends through the passage formed by opening 10 and the flangeO The head of the bol~
engages the inner surface of the bracket and the bolt projects 1~36q5~
from the outer end of the fLange as shown in Figo 40 The two bolts extend through holes in the opposite sides of a face shield 13 that is held on the bolts by nuts 14 screwed onto the outer ends of the bolts, The nuts press elastic washers 15 against the outer surface of the shield to clamp the shield between these washers and the outer en~ of flanges llo The pressure of the washers against the ~hield can be ad~usted by the nuts so that the shield will remain in ~ny position to which it may be tiltedO
It is a feature of this invention that protective ear covers also can be supported by brackets 50 Accordingly, the upper ends of a pair of elongated supporting members or spring arms 17 are provided with holes through which the bracket flanges 11 extendO The arms can be rotated on the flanges between down-wardly extending positions and positions above the brim of the capO The thickness of the upper portion of each arm is less than the length of the flange on which it is mounted, and the outer end portion of the flange is provided with a radial lug 18 that overlies and engages the outer surface of the arm so that the latter is normally located between the lug and the body of the bracket and thereby locked in place by the lugD In order to be able to apply the arm to the flange and also remove it therefrom when desired, the wall of the hole through the spring arm is provided with a radial notch l9o This notch iæ located at the top of the hole while the arm is extending downwardly below the cap. By rotating the arm about 180 around the flange 11 in order to align the notch with lug 18, the arm can be slipped 10367~1 outwardly past the lug and removed from flange 11, provided the nut 14 has first been removed from bolt 12.
The upper portion of each arm 17 is parallel to the ad~oining bracket, but directly beneath the bracket the arm is bent 80 that it slopes downwardly and inwardly towards the opposite arm as shown in Fig. 1. This inclined portion is pro-vided with 8 longitudinal slot 21, in which a headed pin 22 that pro3ects rom the back of an ear cover ~3 i8 slidably and rotat-ably mountedO The head of the pin overlies the outer surface of the arm at opposite sides of the slot, but the head can be removed from the upper end of the slot by pulling it through a circular opening 24that is ~ust large enough to allow the head to pass throughO To prevent accidental separation of the ear cover and its supporting arm after the pin has been inserted in slot 21, the effective diameter of the pin head is increased by mounting an elastic ring 25 on ito This ring encircles the head of the pin tightly and extends inwardly along its inner surfaceO
The ring has to be stretched in order to pull it off or to put it on the head.
Although the slots in spring arms 17 permit the ear covers to be ad~usted up and down to fit over ears that are at different levels on different heads, the device must also accammodate heads of different widths between the earsO The spring arms accamplish this because they can move in or out to decrease or increase the distance between the ear covers as requiredO Since the upper ends of the arms &re mounted on bracket~ 5 above the cap brim, the arms extend straight down from flange 11 to the bottom of the brimO Then they slope ~n-wardly and townwardly beneath the cap.
1036q51 In order to keep the pressura of the ear covers against the head as low as possible for the purpose of comfort, regard-less of the location of a person's ears or the width of his head, provision is made for automatically maintaining substantially uniform pressure under such conditionsO This i8 accomplished by reducing the cross sectional area of the spring arms aa their lower ends are approached so that if the ear covers are near the lower ends of the arms, which will have to be sprung out.ward farther than if the ear covers were near the upper ends of slots 21, the anms still will exert substantially the same pressure against the ear covers and the headO The preferred way of weakening the spring arms as their lower ends are approached is to taper the width of the arms downwardly, and also their thickness. The degree of taper can be determined by experiment, depending principally on the material of which the arms are msdeO
It is obvious that in order to store the ear covers above the cap brim the lower ends of the spring arms must be sprung outwardly a considerable distance to permit the ear covers to be swung up past the brimO The load on the arms should not be permitted to build up materially at that time because it might reach an intolerable level or cause displace-ment of the cap on the head during the processO To avoid such a condition, the lower end portion of each arm below the level at which pins 22 normally would be located is the narrowest length and least thickness of the armO This increases the flexibility of that part of the armO
This device can be used with both the face shield and 103675~
the ear protectors, or it can be used wlth the ear protectors without the face shield, or with the face shield without the ear protec~orsO In place of a face shield, a welding helmet of the type that i8 swung up and down can be used. Generally, if there ~re times when it is not desired to u~e the ear protectors, they will not be removed but will merely be swung up above the cap brim and against the rear portion of the crown of the cap.
~ .036751 of a safety cap lo This 6and may be ccmposed of a strip 2 of plastic, the ends of which are connected by resilient tube 3 cemented to themO The tube can be stretched lengthwise as the band is pressed down,over the cap crown so that the band will snugly engage the cap for most of its cixcumference.
At opposite sides of the cap, brackets 5 are slidably moùnted on the bandO The opposite sides of the central portion of each bracket are provided with slots 6, ehrough which the band extendsO To prevent the bracket from accidentally sliding along the band, the outer surface of the bandat its opposite sides is provided with a number of laterally spaced vertical ribs 7, between which a pair of similar ribs ~ on the inner ~urface of the bracket normally pro3ect as shown in dotted lines in Figo 50 By temporarily straightening the normally curved section of the band that extends through the bracket, the ribs on the band will be withdrawn from the bracket ribs so that the bracket can be ad~usted lengthwise along the bandO
Integral with each bracket is a hook 9 that extends downwardly and hooks under the edge of the narrow side brim of the safety cap to prevent the band fram riding up on the capO
Each bracket 5 also extends up above the band and is provided above it with an opening 10 (Figso 4 and 5)~ the axis of which extends substantially radially of the bandO Encircling the outer end of this opening and integral with the bracket is a cylindrical flange 11. A bolt 12 extends through the passage formed by opening 10 and the flangeO The head of the bol~
engages the inner surface of the bracket and the bolt projects 1~36q5~
from the outer end of the fLange as shown in Figo 40 The two bolts extend through holes in the opposite sides of a face shield 13 that is held on the bolts by nuts 14 screwed onto the outer ends of the bolts, The nuts press elastic washers 15 against the outer surface of the shield to clamp the shield between these washers and the outer en~ of flanges llo The pressure of the washers against the ~hield can be ad~usted by the nuts so that the shield will remain in ~ny position to which it may be tiltedO
It is a feature of this invention that protective ear covers also can be supported by brackets 50 Accordingly, the upper ends of a pair of elongated supporting members or spring arms 17 are provided with holes through which the bracket flanges 11 extendO The arms can be rotated on the flanges between down-wardly extending positions and positions above the brim of the capO The thickness of the upper portion of each arm is less than the length of the flange on which it is mounted, and the outer end portion of the flange is provided with a radial lug 18 that overlies and engages the outer surface of the arm so that the latter is normally located between the lug and the body of the bracket and thereby locked in place by the lugD In order to be able to apply the arm to the flange and also remove it therefrom when desired, the wall of the hole through the spring arm is provided with a radial notch l9o This notch iæ located at the top of the hole while the arm is extending downwardly below the cap. By rotating the arm about 180 around the flange 11 in order to align the notch with lug 18, the arm can be slipped 10367~1 outwardly past the lug and removed from flange 11, provided the nut 14 has first been removed from bolt 12.
The upper portion of each arm 17 is parallel to the ad~oining bracket, but directly beneath the bracket the arm is bent 80 that it slopes downwardly and inwardly towards the opposite arm as shown in Fig. 1. This inclined portion is pro-vided with 8 longitudinal slot 21, in which a headed pin 22 that pro3ects rom the back of an ear cover ~3 i8 slidably and rotat-ably mountedO The head of the pin overlies the outer surface of the arm at opposite sides of the slot, but the head can be removed from the upper end of the slot by pulling it through a circular opening 24that is ~ust large enough to allow the head to pass throughO To prevent accidental separation of the ear cover and its supporting arm after the pin has been inserted in slot 21, the effective diameter of the pin head is increased by mounting an elastic ring 25 on ito This ring encircles the head of the pin tightly and extends inwardly along its inner surfaceO
The ring has to be stretched in order to pull it off or to put it on the head.
Although the slots in spring arms 17 permit the ear covers to be ad~usted up and down to fit over ears that are at different levels on different heads, the device must also accammodate heads of different widths between the earsO The spring arms accamplish this because they can move in or out to decrease or increase the distance between the ear covers as requiredO Since the upper ends of the arms &re mounted on bracket~ 5 above the cap brim, the arms extend straight down from flange 11 to the bottom of the brimO Then they slope ~n-wardly and townwardly beneath the cap.
1036q51 In order to keep the pressura of the ear covers against the head as low as possible for the purpose of comfort, regard-less of the location of a person's ears or the width of his head, provision is made for automatically maintaining substantially uniform pressure under such conditionsO This i8 accomplished by reducing the cross sectional area of the spring arms aa their lower ends are approached so that if the ear covers are near the lower ends of the arms, which will have to be sprung out.ward farther than if the ear covers were near the upper ends of slots 21, the anms still will exert substantially the same pressure against the ear covers and the headO The preferred way of weakening the spring arms as their lower ends are approached is to taper the width of the arms downwardly, and also their thickness. The degree of taper can be determined by experiment, depending principally on the material of which the arms are msdeO
It is obvious that in order to store the ear covers above the cap brim the lower ends of the spring arms must be sprung outwardly a considerable distance to permit the ear covers to be swung up past the brimO The load on the arms should not be permitted to build up materially at that time because it might reach an intolerable level or cause displace-ment of the cap on the head during the processO To avoid such a condition, the lower end portion of each arm below the level at which pins 22 normally would be located is the narrowest length and least thickness of the armO This increases the flexibility of that part of the armO
This device can be used with both the face shield and 103675~
the ear protectors, or it can be used wlth the ear protectors without the face shield, or with the face shield without the ear protec~orsO In place of a face shield, a welding helmet of the type that i8 swung up and down can be used. Generally, if there ~re times when it is not desired to u~e the ear protectors, they will not be removed but will merely be swung up above the cap brim and against the rear portion of the crown of the cap.
Claims (2)
1. An ear protecting device for mounting on a safety cap, comprising a pair of spring arms having upper ends formed for connection to the opposite sides of a safety cap, said arms being flat resilient strips having substantially parallel upper portions and lower portions normally sloping downwardly toward each other from the lower ends of said upper portions, said downwardly sloping portion of each arm tapering in thickness and width toward its lower end, and an ear cover carried by the lower end of each arm and having a headed retaining pin projecting from its back, the sloping lower portion of each arm being pro-vided with a central longitudinal slot slidably and rotatably receiving the retaining pin on the adjoining ear cover.
2. An ear protecting device according to claim 1, in which the lower end portion of each arm has a uniform thickness and width that is substantially the same as the thickness and width of the lower end of its tapered portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US483409A US3898700A (en) | 1974-06-26 | 1974-06-26 | Ear protecting device for safety caps |
| CA225,714A CA1035901A (en) | 1974-06-26 | 1975-04-29 | Ear protecting device for safety caps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1036751A true CA1036751A (en) | 1978-08-22 |
Family
ID=25667929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,155A Expired CA1036751A (en) | 1974-06-26 | 1978-01-18 | Ear protecting device for safety caps |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1036751A (en) |
-
1978
- 1978-01-18 CA CA295,155A patent/CA1036751A/en not_active Expired
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