U.S. patent number 3,898,700 [Application Number 05/483,409] was granted by the patent office on 1975-08-12 for ear protecting device for safety caps.
This patent grant is currently assigned to Mine Safety Appliances Company. Invention is credited to Ellison L. Davison, Leo D. Ziegler.
United States Patent |
3,898,700 |
Davison , et al. |
August 12, 1975 |
Ear protecting device for safety caps
Abstract
A band that is adapted to surround the crown of a safety cap
carries a pair of brackets at its opposite sides, which are
provided with downwardly extending hooks to hook under the edge of
the cap. Each of the brackets has an opening through it above the
band, with the axis of the opening extending radially of the band.
Projecting outwardly from the bracket around its opening is a
cylindrical flange that extends through a hole in one end of a
spring arm that carries an ear cover at its opposite end. A lug
projects radially from the outer end of the flange and overlaps the
arm to hold it on the flange, but the wall of the hole through the
arm has a notch in it to enable the arm to be slipped off the
flange after the arm has been rotated to align the notch with the
lug. Bolts may be inserted in the bracket openings and provided
with nuts on their outer ends for clamping a face shield against
the outer ends of the bracket flanges.
Inventors: |
Davison; Ellison L. (Gibsonia,
PA), Ziegler; Leo D. (Monroeville, PA) |
Assignee: |
Mine Safety Appliances Company
(Pittsburgh, PA)
|
Family
ID: |
23919950 |
Appl.
No.: |
05/483,409 |
Filed: |
June 26, 1974 |
Current U.S.
Class: |
2/209 |
Current CPC
Class: |
A42B
3/166 (20130101) |
Current International
Class: |
A42B
3/04 (20060101); A42B 3/16 (20060101); A42b
001/06 () |
Field of
Search: |
;2/209,3R,8 ;179/156R
;403/348,349 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
742,916 |
|
May 1943 |
|
DD |
|
1,037,901 |
|
May 1953 |
|
FR |
|
Primary Examiner: Scanlan, Jr.; Richard J.
Assistant Examiner: Nerbun; Peter
Attorney, Agent or Firm: Brown, Murray, Flick &
Peckham
Claims
We claim:
1. An ear protecting device for mounting on a safety cap having a
brim, said device comprising a band adapted to surround the crown
of such a cap, a pair of brackets mounted on the band at opposite
sides thereof and provided with downwardly extending hooks for
hooking under the edge of the brim, each of said brackets having an
opening therethrough above said band, the axis of the opening
extending substantially radially of the band, a cylindrical flange
projecting outwardly from the bracket around said opening, a pair
of spring arms for supporting ear covers, each arm having a hole
through one end receiving one of said flanges, an ear cover carried
by the other end of the arm, and a retaining lug projecting
radially from the outer end portion of each cylindrical flange and
overlapping the arm supported by the flange to hold it thereon, the
wall of said arm hole being provided with a radial notch to enable
the arm to be slipped off said flange after the arm has been
rotated on the flange to align the notch with said lug.
2. An ear protecting device according to claim 1, in which said
lugs are at the bottom of said cylindrical flanges, and said
notches are at the top of said arm holes, whereby the lower ends of
the arms must be swung up above the brackets to align the notches
with said lugs.
3. An ear protecting device according to claim 1, in which each of
said arms is a flat resilient strip having an upper portion
substantially perpendicular to the axis of the cylindrical flange
supporting it, and a lower portion normally sloping downwardly and
inwardly from the lower end of said upper portion and tapered
downwardly in cross section, each of said ear covers having a
headed retaining pin projecting from its back, and said sloping
lower portion of each arm being provided with a central
longitudinal slot for slidably and rotatably receiving the
retaining pin on the adjoining ear cover.
4. An ear protecting device according to claim 3, in which said
downwardly sloping portion of each arm tapers both in thickness and
width toward its lower end.
5. An ear protecting device according to claim 4, 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.
6. An ear protecting device according to claim 1, including bolts
extending through said bracket openings and having heads at the
inner ends of the openings, the bolts being adapted to extend
through holes in the opposite sides of a face shield, and nuts on
the outer ends of the bolts for clamping the shield against the
outer ends of the said flanges.
7. An ear protecting device according to claim 6, including
resilient washers on said bolts for compression between the outer
surface of a face shield and the inner ends of the adjoining nuts
to press the shield against said flanges.
8. 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 provided with a central
longitudinal slot slidably and rotatably receiving the retaining
pin on the adjoining ear cover.
9. An ear-protecting device according to claim 8, 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.
Description
In Pat. No. 3,375,529, an assembly is shown for mounting a face
shield on headgear. This includes a band that extends around the
crown of a safety cap and supports brackets at its opposite sides
that hook onto the lower edge of the cap. The brackets support
bolts on which the opposite sides of a face shield are mounted.
This shield is held in its upper or lower position by nuts screwed
on the outer ends of the bolts.
It is among the objects of this invention to provide an assembly
similar to the one shown in the above-mentioned patent, 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 removed when desired, and which exerts substantially
the same pressure against the ear covers regardless of head
sizes.
The preferred embodiment of the invention is illustrated in the
accompanying drawings, in which
FIG. 1 is a front view;
FIG. 2 is a side view;
FIG. 3 is a fragmentary plan view;
FIG. 4 is an enlarged fragmentary vertical section; and
FIG. 5 is a vertical section taken on the line V--V of FIG. 4.
Referring to the drawings, a relatively stiff but somewhat flexible
band extends around the lower portion of the crown of a safety cap
1. This band may be composed of a strip 2 of plastic, the ends of
which are connected by resilient tube 3 cemented to them. 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 circumference.
At opposite sides of the cap, brackets 5 are slidably mounted on
the band. The opposite sides of the central portion of each bracket
are provided with slots 6, through which the band extends. To
prevent the bracket from accidentally sliding along the band, the
outer surface of the band at its opposite sides is provided with a
number of laterally spaced vertical ribs 7, between which a pair of
similar ribs 8 on the inner surface of the bracket normally project
as shown in dotted lines in FIG. 5. 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 adjusted lengthwise along the
band.
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 from riding up on the cap.
Each bracket 5 also extends up above the band and is provided above
it with an opening 10 (FIGS. 4 and 5), the axis of which extends
substantially radially of the band. 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 flange. The head of the bolt engages the inner surface of the
bracket and the bolt projects from the outer end of the flange as
shown in FIG. 4. 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 ends of flanges 11. The
pressure of the washers against the shield can be adjusted by the
nuts so that the shield will remain in any position to which it may
be tilted.
It is a feature of this invention that protective ear covers also
can be supported by brackets 5. 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 extend. The arms
can be rotated on the flanges between downwardly extending
positions and positions above the brim of the cap. 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 lug. 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 19. This notch is
located at the top of the hole while the arm is extending
downwardly below the cap. By rotating the arm about 180.degree.
around the flange 11 in order to align the notch. with lug 18, the
arm can be slipped 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 adjoining
bracket, but directly beneath the bracket the arm is bent so that
it slopes downwardly and inwardly towards the opposite arm as shown
in FIG. 1. This inclined portion is provided with a longitudinal
slot 21, in which a head pin 22 that projects from the back of an
ear cover 23 is slidably and rotatably mounted. 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 24 that is just large enough
to allow the head to pass through. 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 it. This ring encircles
the head of the pin tightly and extends inwardly along its inner
surface. 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
adjusted up and down to fit over ears that are at different levels
on different heads, the device must also accommodate heads of
different widths between the ears. The spring arms accomplish this
because they can move in or out to decrease or increase the
distance between the ear covers as required. Since the upper ends
of the arms are mounted on brackets 5 above the cap brim, the arms
extend straight down from flange 11 to the bottom of the brim. Then
they slope inwardly and downwardly beneath the cap.
In order to keep the pressure of the ear covers against the head as
low as possible for the purpose of comfort, regardless of the
location of a persons ears or the width of his head, provision is
made for automatically maintaining substantially uniform pressure
under such conditions. This is accomplished by reducing the cross
sectional area of the spring arms as 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 outward farther than if the ear
covers were near the upper ends of slots 21, the arms still will
exert substantially the same pressure against the ear covers and
the head. 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 made.
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 brim. 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 displacement of the cap on the head during the process. 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 arm. This increases the
flexibility of that part of the arm.
This device can be used with both the face shield and the ear
protectors, or it can be used with the ear protectors without the
face shield, or with the face shield without the ear protectors. In
place of a face shield, a welding helmet of the type that is swung
up and down can be used. Generally, if there are times when it is
not desired to use 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.
According to the provisions of the patent statutes, we have
explained the principal of our invention and have illustrated and
described what we now consider to represent its best embodiment.
However, we desire to have it understood that, within the scope of
the appended claim, the invention may be practiced otherwise than
as specifically illustrated and described.
* * * * *