|Publication number||US3787899 A|
|Publication date||Jan 29, 1974|
|Filing date||Jul 11, 1972|
|Priority date||Jul 11, 1972|
|Publication number||US 3787899 A, US 3787899A, US-A-3787899, US3787899 A, US3787899A|
|Original Assignee||Imp Optical Co Ltd, Safety Supply Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (65), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
C 1 United States Patent 1 91 1111 3,787,899 Krawagna Jan. 29, 1974 [5 EAR MUFF ASSEMBLY 817,457 4/1906 Turner 179 156 1,586,391 5 1926 T' 179/156  Inventor: Alms Krawagna Town), 2,501,107 3/1950 vil'ifii'in Omar"), Canada 3,272,926 9 1966 Falkenberg 179/182  Assignee: Imperial Optical Company Ltd.,
trading as Safety Supply Co., Primary Examiner-Jordan Franklin Toronto, Ontario, Canada Assistant Examiner-Peter Nerbun  Filed July 11 7 Attorney, Agent, or FirmGordon W. l-lodson et a1.
1 A 1. N .1 27 1 PP 0 0 605 57 ABSTRACT  U s C]. 2/209 179/182 79/156 R An ear muff assembly for use with a headband includ- [51 I 41 d 21/00 ing an ear cup, a circumferentially extending first  Fieid R, 1 R bearing, the ear cup being mounted in the first bearing 179/156 181/33 R 20 for rotatlon about a first axis, a yoke, the clrcumferentially extending bearing being mounted in the yoke for 56] Referenes Cited rotation about a second axis which extends laterally of the first axis, the yoke being mountable on the head- UNITED STATES PATENTS band. 3,457,376 7/1969 Kreisel et a1......... 179/182 R 678,170 7/1901 Gardner 179/182 X 3 Claims, 4 Drawing Figures PAIENTEU M29197i 3. 787. 899
30 F I G. 4 14 EAR MUFF ASSEMBLY FIELD OF INVENTION This invention relates to ear muff assemblies. In particular, this invention relates to an ear muff assembly for use with a headband wherein the ear muffs are pivotally mounted about two axes without forming passages in the cup to provide the pivotal mounting.
PRIOR ART Ear muff assemblies such as sound absorbing muffs and head phones are mounted on headbands so as to be positional over the ears of the wearer. Generally, the headband is intended to extend upwardly over the head of the wearer. However, in manyapplications the wearers prefer to locate the headband in an area remote from the hair, either in front of or behind the head. Where the ear muffs are circular, this presents no problem in that the ear muffs may be positioned at any position relative to the ear. It is, however, frequently desirable to contour the ear muffs so as to fit comfortably over the ears of the wearer and to provide for a mounting of the ear muffs to permit the headband to be moved relative to the ear muffs when being worn. The pivotal mountings which have been provided prior to the present invention employ a mounting screw or pivot pin which extends through the cup and pivotally connected to a support carried by the headband. It has been found that a pivot pin mounted directly in a passage formed in the ear cup decreases the effectiveness of the sound attenuation of the ear muffs by reason 'of the fact that vibrations established in the headband are transmitted directly to the walls of the ear cup. Furthermore, the assembly of the component parts of the ear muff to include a pivot pin mounted within the ear cup is time consuming.
SUMMARY OF INVENTION The present invention overcomes the difficulties of the prior art described above by providing an ear muff assembly which is simple in construction and inexpensive to assemble and which providesa pivotal mounting of the ear muff about two axes without requiring a pivot pin extending through the walls of the cup.
According to the embodiment of the present invention, an ear muff assembly for use with the headband includes the improvement of an-ear cup, a collar, the ear cup being mounted in the collar for rotation about the first axis extending normal ,to the ear cup, a yoke for the collar, the collar being mounted in the yoke for rotation about a second axis which extends laterally of the first axis and means for mounting the yoke on a headband.
PREFERRED EMBODIMENT The invention will be clearly understood after reference to the following detailed specification read in conjunction with the drawings wherein,
FIG. 1 is a pictorial view of an ear muff assembly according to an embodiment of the present invention;
FIG. 2 is a sectional view in the direction of the line 22 of FIG. I;
FIG. 3 is a pictorial view of a collar according to an embodiment of the present invention; and
FIG. 4 is a sectional view taken along the line 4-4 of FIG. 2.
With reference to the drawings, the reference numeral l0 refers generally to a head set according to the present invention which includes a pair of ear muff assemblies 12 connected to one another by means of a headband 14. Each of the ear muff assemblies 12 consists of a yoke 16, a cup 18 and a collar 20.
The yoke 16 has a generally U-shaped lower end having a pair of arms 22 formed with axially aligned passages 24. The upper end of the yoke is formed with a resilient body portion 26 and side walls 28, each of which have inwardly directed flanges 30 cooperating with the body portion 26 to form .a channel for receiving the headband 14. The headband 14 has a ridgeat each outer end thereof which engages the inner edge of the flanges 30 when the yokes are mounted on the headband (FIG. 2).
Each of the cups 18 has an outer surface 32, an inner surface 34 and an end face 36. The outer surface 32 is formed with an annular U-shaped bearing recess 38. In the embodiment illustrated, the inner surface 34 is formed with a radially projecting face disposed inwardly from the edge 36. A shallow annular groove 42 extends around the inner face of the cup adjacent the face 36. An end plate 44 is formed with a shoulder 46 adapted to fit in a close fitting relationship within the groove 42 so as to mount the ring 44 in a position extending over the edge 36 of the cup. A resilient pad 48 is adapted to extend over the face of the plate 44 and has a lip 50 which extends over the adjacent side wall of the plate 44 and the cup 18 so as to be mounted thereon. The collar 20 (FIG. 3) provides a circumferentially extending first bearing and has an inner surface 52 and a pair of side surfaces 54 adapted to fit in a close fitting sliding relationship within the U-shaped channel 38. A pair of circular lugs 56 project radially from the outer surface 57 of the collar 20. One of the lugs 56 is radially split so as to provide a pair of oppositely disposed faces 58. Each of the lugs 5 6 is formed with an annular recess 60 disposed inwardly of the end thereof. The lugs 56 are adapted to fit in a close fitting relationship within the passages 24 of the yoke 16. The annular recess 60 is adapted to receive a small flange formed adjacent the inner end of the passages 24 of the yoke so that the lugs may be retained therein.
The ear muffs are assembled as shown in FIG. 1 of the drawings so that the cup is rotatable about a first axis 62 (FIG. 2) which extends substantially normal to the head engaging surfaces by rotating the cup relative to the collar 20. The cup is also rotatable about an axis 64 which extends transversely of the arms of the yoke 16 by rotating the collar relative to the yoke about the lugs 56. The muff may be rotated about the axis 64 from the normal position shown in FIG. 2, the two alternative broken line positions also shown in FIG. 2 of the drawings.
In use, the ear muffs may beplaced over the ears of the wearer with the headband in any position relative to the ear muffs by reason of the rotation provided by the mounting of the collar on the cup and the ear muffs may be aligned with the head of the wearer by rotation of the muffs about the axis 64.
An important feature of the present invention is the fact that the pivotal mounting of the cup relative to the headband is provided without mounting any pivot pins in passages extending through the body of the cup. It will be noted that any vibrations picked up by the headband will not be transmitted directly to the cup in view of the fact that there is no rigid connection between the headband and the wall of the cup. Furthermore, the fact that there are no passages opening through the wall of the cup prevents extraneous vibrations being transmitted to the interior of the cup.
The muffs may be used to either dampen sound or as receiver ear phones. When the muffs are used as ear phones, a speaker 66 is mounted on a face plate 68 which is in turn mounted on the radially extending ledge 40 of the cup. The speaker 66 is disposed within the cup and a through passage 70 (broken lines, FIG. 2) is formed in the walls of the cup to permit a conductor to communicate with the speaker. In use, the conductor will be sealed within the passage 70 by means of a suitable sealing compound. It will be noted that forming a passage in the wall of the cup to receive a conductor does not have the same deleterious effect on the sound attenuation characteristics as the mounting of a pivot on the cup or in a passage formed through the wall of the cup.
To assemble the ear muff of the present invention, the collar is located in the position extending around the U-shaped channel 38. The mounting of the collar in the channel 38 is facilitated by splitting at least one of the lugs 56 as shown in FIG. 3 of the drawings. When the collar is in position, the yoke is located over the lugs 56. The yoke serves to clamp the split sections of the split lug 56 together so as to maintain the collar in a close fitting sliding relationship within the channel 38. It will be noted that the ear muff assembly may be completed without requiring any hand tools.
From the foregoing, it will be apparent that the present invention provides a simple and inexpensive ear muff assembly for use with teh headband which has the advantage of being pivotable about a pair of axes without the direct mounting of a pivot pin through the wall of the ear cup.
The ear cup collar and yoke may be formed from any of the well known materials used for the manufacture of ear muffs. The construction of the ear muff for the present invention is particularly suitable for moulding in plastic material and may be formed from a plastic material such as LEXAN (trade mark), available from Canadian General Electric Company Limited.
Various modifications of the. present invention will be apparent to those skilled in the art without departing from the scope of the invention. For example, the col lar 20 may be split along both lugs 56 so this is formed in two parts. it is, however, advantageous to form the collar in one part as it facilitates the assembly of the device.
It will also be understood that the circumferentially extending bearing formed by thecollar 20 may also be provided by a pair of arcuately shaped segments, each of which may have a pivot pin formed thereon for engagement with the yoke.
It will be apparent to those skilled in the art that it is not essential to form the circumferentially extending first bearing means to extend around the entire length of the bearing surface of the cup. However, as previously indicated, the split collar has the advantage of being easy to mount and remove as required in use.
What 1 claim as my invention is:
1. An ear muff assembly comprising a. a U-shaped head band having a pair of oppositely disposed ends, a transverse ridge projecting inwardly of said U-shaped configuration at each end of said head band, a longitudinal ridge projecting outwardly of said U-shaped configuration at each end of said head band and extending longitudinally thereof,
b. a pair of Y-shaped yoke members each having a leg portion releasably connected at one end to an end of said head band and a pair of arm portions projecting outwardly from the other end of said leg portion, said one end of each leg portion being formed with a U-shaped channel adapted to receive an end of said head band in a close fitting sliding relationship, a pair of flanges projecting inwardly of the U-shaped section of said leg portion and extending longitudinally of said leg portion from said one end of said leg portion, said flanges being spaced from the base of the U-shaped channel a distance which is less than the combined thickness of the head band and the transverse ridge at the end of the band whereby the ends of said head band are releasably locked in said U-shaped channels, said arm portions having transversely extending axially aligned passages formed adjacent the outer ends thereof, said arms being formed to locate said axially aligned passages inwardly of the arc of curvature of said head band,
c. a pair of ear cup members, each having a central axis, an outer surface and an inner surface, said cup members opening inwardly from said head band and being disposed inwardly of said yoke members to be located directly between said yoke members and the head of the wearer in use, a circumferentially extending recessed bearing channel formed in a unitary portion of the outer surface of each of said cup members concentric with respect to said central axis,
d. a bearing collar having a circumferentially extending body portion adapted to fit within said recessed bearing channel of each ear cup in a close fitting sliding relationship whereby said ear cup may be rotated with respect to said bearing collar about said central axis, each of said bearing collars having a pair of diametrically opposed bearing shafts projecting radially from diametrically opposite sides of said body portion, said shafts being mounted for rotation within said transversely extending axially aligned passages of said arms of said yoke member to permit rotation of said ear cups about the axis of said transversely extending vpassages,
e. said bearing collar being radially split in a plane which extends through said body portion and at least one of said bearing shafts whereby said body portion may be opened to permit location of said collar in said recessed grooves, at least one of said transversely extending passages of said yoke retaining the two portions of a split shaft therein to lock said body portion of said bearing collar within said bearing channel of said ear cup, and
f. said head band and yoke members being rotatable about said central axis of said cup members by rotation of said bearing collar members with respect to said cup members through an angle of at least whereby the head band may be moved from a position overlying the head of the wearer to a position underlying the head of the wearer as required in use.
2. An ear muff assembly comprising a. a generally U-shaped head band,
I b. a pair of Y-shaped yoke members, each having a leg portion connected at one end of said head band and a pair of arms projecting outwardly from the other end of said leg portion, said arms having transversely extending aligned passages formed therein adjacent the outer ends thereof,
. a pair of ear cup members opening inwardly of said d. a bearing collar having a circumferentially extending body portion adapted to fit within said recessed bearing channel of each ear cup in a close fitting sliding relationship whereby said ear cup may be rotated with respect so said bearing collar about said central axis, each of said bearing collars having a pair of diametrically opposed bearing shafts projecting radially from diametrically opposite sides of rotation within said transversely extending' axially aligned passages of said arms of said yoke member to permit rotation of said ear cups about the axis of said transversely extending passages,
e. said bearing collar being radially split in a plane which extends through said body portion and at least one of said bearing shafts whereby said body portion may be opened to permit location of said collar in said recessed grooves, at least one of said transversely extending passages of saidyoke retaining the twoportions of a split'shaft therein to lock said body portion of said bearing collar within said bearing channel of said ear cup.
3. An ear muff assembly as claimed in claim 2 wherein said arms of said yoke member extend inwardly of the arc of curvature of said head band to dispose said collar member radially inwardly of said are of curvature of said head band, whereby said head band may be spaced outwardly.
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|U.S. Classification||2/209, 381/378, 381/371|
|Cooperative Classification||H04R5/0335, H04R1/1008, H04R1/1066|