Headset with adjustable earhook

A telephone headset apparatus is disclosed. This headset apparatus includes a body having a microphone at one end and a transducer at the opposite end, an earhook, for attaching the apparatus to the ear of the operator, and a mechanism, contained within the body in a movable engagement, for holding the earhook in a frictional engagement that allows for movement of the earhook, with three degrees of freedom. The mechanism is located at a point within the body where upon adjustment of the earhook by the operator (i.e., rotated, tilted, pivoted) the headset apparatus remains properly balanced and within the sound envelope of an operator, for uninterrupted operation.

FIELD OF THE INVENTION 
This invention relates to telephone headsets, and in particular to a 
telephone headset that is held on the ear of an operator. This telephone 
headset is designed to remain properly balanced and positioned for proper 
functioning when the headset body and/or the earhook is moved for 
adjustment on the ear of the operator. 
BACKGROUND OF THE INVENTION 
Telephone headsets continue to become smaller and decrease in weight, as 
electronics become increasingly sophisticated. Several of these headsets 
include complex bulky structures for retaining the headset on the head of 
the operator such that the microphone remains in the sound envelope of the 
operator and the ear piece remains in the ear of the operator. Other 
headsets are designed to attach to the ear of an operator. However, these 
headsets exhibit a major drawback in that even slight adjustments will 
cause the headset to become unstable and unbalanced, whereby the 
microphone portion moves out of the sound envelope of the operator's voice 
and the transducer moves out of the ear of the operator. 
SUMMARY OF THE INVENTION 
The present invention improves on the prior art by providing a telephone 
headset apparatus that remains balanced on an operator, within the sound 
envelope and thus, properly functioning, when the headset apparatus is 
being adjusted on the head of the operator. The telephone headset 
apparatus comprises a body having a microphone at one end and a transducer 
at the opposite end, an earhook, for attaching the apparatus to the ear of 
the operator, and a mechanism contained within the body for holding the 
earhook in a frictional engagement that allows for rotation of the 
earhook. The mechanism is retained in the body such that it is movable, 
allowing for earhook movement having three degrees of freedom (i.e., 
rotating, tilting and pivoting). The mechanism is located at a point 
within the body where upon adjustment of the earhook by the operator, the 
headset apparatus remains properly balanced, for uninterrupted operation.

DETAILED DESCRIPTION OF THE DRAWINGS 
FIG. 1 shows the headset 20 of the present invention in use with a 
telephone operator 22. The headset 20 includes a body 24 having a 
microphone 26 at one end and a transducer 28 at the opposite end. The body 
24 is held on the ear of the telephone operator 22 by an earhook 30, 
rotatably mounted in a clutch 34. The clutch 34 is movably retained in the 
body 24, and is positioned along the body 24 at a point intermediate the 
microphone 26 and the transducer 28. This arrangement of the earhook 30 
within the clutch 34, coupled with the arrangement of the clutch 34 in the 
body 24, allows the earhook 30 movement with three degrees of freedom. A 
cord 36, received in a protrusion 38 of the transducer 28, allows 
connection of the headset 20 to a telephone system (not shown). 
FIGS. 2-5 show the headset 20 in greater detail. The headset 20 includes a 
body 24 terminating in a microphone 26 and a transducer 28. The body 24 is 
preferably made of two pieces, an inner piece 40, placed adjacent the face 
of the operator 22 (FIG. 1), and an outer piece 41, located opposite the 
face of the operator 22 (FIG. 1). Each piece 40, 41 is preferably tapered 
such that the portion of the body 24 at the microphone end has a smaller 
circumference than at the transducer end. 
The inner and outer pieces 40, 41 also include recessed portions 44, 45 on 
both their upper surfaces 48 and lower surface 49, that form a well 50, 
extending through the body 24. The well 50 frictionally retains the clutch 
34 in a movable engagement. The well 50 is located at a point along the 
body 24, where the microphone 26 and the transducer 28 will remain stable 
and balanced on the operator 22 (FIG. 1), keeping the microphone 26 within 
the operator's voice envelope. The headset 20 remains functional and in 
proper operation, when the earhook 30 and/or the clutch 34 are moved as 
the headset 20 is being placed onto or adjusted to the ear of the operator 
22 (FIG. 1). 
The inner piece 40, in particular that portion that forms the microphone 
26, includes an opening 52 for sound. The portion of the transducer 28 
formed by this inner piece 40, is preferably asymmetrically conical in 
shape, for adaptation to the ear, and terminates in a vertex 54, 
surrounded by apertures 56, open to the ambient environment. The vertex 
54, and the apertures 56 therein, are positioned off-center with respect 
to the generally circular shape of the inner piece 40 that forms a portion 
of the transducer 28. This off-center positioning allows the vertex 54 to 
fit inside the ear in close proximity to the ear canal, while enhancing 
the balance of the headset 20 on the operator 22 (FIG. 1). 
The outer piece 41, in particular that portion that forms the transducer 
28, includes radially aligned apertures 57, open to the ambient 
environment. The protrusion 38 extends from this outer piece 41 to receive 
the connecting cord 36 (FIG. 1). 
Turning additionally to FIGS. 6 and 7, the inner piece 40 and the outer 
piece 41 combine to form a hollow cavity 60 for housing for the various 
electronic (microelectronic) components, such a microphone unit (not 
shown), amplifiers (not shown), receivers (not shown), wires (not shown) 
and other components typically known to those of skill in the art for 
telephone or other headsets. The hollow cavity 60 at the microphone 26 
includes indentations 61 conforming to the shape of the microphone 
component and guideribs 62 for wires. The cavity 60 includes the well 50, 
that contains the clutch 34. 
The structural integrity of the cavity 60 is maintained by an outwardly 
extending support member 63, on the outer piece 41 that is received in a 
cup 64 protruding from the inner piece 40. Additionally, the inner piece 
40 includes teeth 66a, 66b that receive a perpendicular rib 67 on the 
outer piece 41 in a cooperating arrangement for further maintaining the 
structural integrity of the cavity 60. Additional support structures for 
maintaining the structural integrity of the cavity 60, other than those 
described, but well know to those skilled in the art are also permissible, 
provided they allow for proper placement of the electronic components and 
wires placed in the cavity 60. 
The well 50 is designed to contain the clutch 34 in a movable engagement. 
The well 50 includes oppositely disposed concave walls 68a, 68b, 69a, 69b 
on the inner piece 40 and the outer piece 41 respectively, having 
curvatures approximately equal to that of the clutch 34. The concave walls 
68a, 68b, 69a, 69 extend from near the center of each piece 40, 41 to 
openings 72, 74 (formed by the recessed portions 44, 45 of the inner and 
outer pieces 40, 41) at the upper 48 and lower 49 surfaces of the body 24. 
These openings 72, 74 have lengths less than the diameter of the clutch 
34. Convex-ended members 75a, 75b, oppositely disposed on the outer piece 
41, are positioned to abut the ends of the clutch 34, preferably at the 
opposite peripheral ends. This abutment is such that the clutch 34, and 
ultimately the earhook 30, can be pivoted laterally about the body 24 for 
adjusting the earhook 30. This is described in detail in FIGS. 10 and 11 
below. 
The convex-ended members 75a, 75b are received by cut outs 76a, 76b 
extending from the inner piece 40. The cooperating structures of the 
convex-ended members 75a, 75b and the cut outs 76a, 76b also function to 
maintain the structural integrity of the cavity 60. Alternately, 
additional convex ended members and cut outs may be employed and any or 
all of the convex ended members and cut outs could be located on either 
the inner piece 40 and the outer piece 41. 
Referring additionally to FIGS. 10 and 11, the clutch 34 is preferably a 
lightweight plastic or polymeric disc. A bore 80 extends through clutch 34 
and receives a first linear portion 82 of the earhook 30. The inner and 
outer pieces 40, 41 include walls 84a, 84b, 85a, 85b extending from a 
central point and tapered outwardly toward the upper 48 and lower 49 
surfaces. The tapers combined form an dihedral angle 8, of approximately 
20.degree., with a single taper being angled at .theta./2 (with respect to 
the vertical). The clutch peripheral edge surface 86 abuts the 
convex-ended members 75a, 75b, allowing the clutch 34 to be moved 
(pivoted), in the direction of the double arrow 87, to positions as far as 
where the clutch side faces 88, 89 abut opposite tapered walls 84b, 85a 
(shown in FIG. 11). 
The inner piece 40 and the outer piece 41 that form the body 24, are 
preferably made of lightweight plastics by injection molding or the like. 
Alternately, other similar materials known to those skilled in the art, 
made by conventional techniques, could be used as well. These lightweight 
materials decrease the stress of the headset 20 on the ear. The inner 
piece 40 and the outer piece 41 are preferably attached by a friction or 
snap fit, by having cooperating (i.e. male-female) edges 90, 91 (FIGS. 6 
and 7) and secured by adhesives, spot welding or the like. 
The earhook 30 is configured to the shape of the human ear, for retention 
thereon. The preferred earhook 30 includes a first linear portion 82, a 
second linear portion 93, and a curved portion 94. The first linear 
portion 82 is tapered to include a portion of a greater outside diameter 
than that of the bore 80 (FIGS. 10 and 11), in order to be received in the 
bore 80 with sufficient friction to retain the earhook 30, and allow for 
the earhook 30 to rotate therein (as detailed in FIG. 8 below). This first 
linear portion 82 may also include a cut out segment 83 (FIG. 3) to 
facilitate movement through the bore 80. Other alternate designs are 
permissible, provided they are configured for the human ear. This earhook 
30 is preferably made of lightweight plastic or metal. It may be coated 
with an elastomer or other similar material to provide increased friction, 
enhancing the retention forces between the first linear portion 82 and the 
bore 80 (FIGS. 10 and 11) of the clutch 34. The earhook 30 may also be 
padded with additional soft material if desired, for the operator's 
comfort. 
FIG. 8 details movement of the earhook 30 within the clutch 34. This 
functional retention of the earhook 30 in the bore 80 (FIGS. 10 and 11) 
allows the earhook 30 to rotate about the bore 80 to the positions for 
ordinary usage on the ear or storage, detailed in phantom lines and solid 
line 95. Also shown is the rotational capability of earhook 30, as 
detailed in phantom lines and broken line 96. 
FIG. 9 details rotation of the clutch 34 within the well 50 of the body 24. 
The rotation of the clutch 34 (in the direction of the double arrow 98) 
allows the earhook 30 to move (tilt) to the positions, shown in phantom 
lines for adjustment on the ear of the operator 22 (FIG. 1). 
While the invention has been described in connection with an embodiment, it 
will be understood that the invention is not limited to that embodiment. 
The invention is intended to cover all alternatives, modifications and 
equivalents as may be included within the spirit and scope thereof, as 
defined by the appended claims.