Earmuffs

Abstract

Earmuffs with a joint are provided to create a biased pressure distribution about a perimeter of the cup. The earmuffs may include a pivot joint. The pressure distribution creates a wedging pressure (e.g., on a top edge) on the cups that hold the earmuffs on the user's head, for example, when the user rotates the headband behind the head. The bias pressure is also used to adjust the seal formed between the pad and the user's head. Adjustments to the moment created by separating the joints from the cup's apex enable a user to selectively adjust the seal according to the user's preference. A cam is added to the headband to change the hoop stress distributed at the joints and further adjust the compressive forces generated to hold the earmuffs against the user's head.

Claims

1. An earmuff assembly, comprising: an ear cup, comprising, an outer shell comprising a first side and a second side opposite the first side, and an ear pad coupled to the first side of the outer shell, the ear pad comprising: an interior perimeter that defines an opening and an ear loop that extends across the opening from a first side of the interior perimeter to a second side of the interior perimeter; a pivot mount coupled to the second side of the outer shell, the pivot mount protruding from the outer shell and comprising an exterior channel; and a first band segment comprising: a first end that pivotably couples to the exterior channel; a second end opposite the first end; and a surface that forms an opening in the first end.

2. The earmuff assembly of claim 1, wherein the first band segment is configured to rotate about the pivot mount and to tilt within the exterior channel, such that the second end may be adjusted toward or away from the ear cup.

3. The earmuff assembly of claim 1, wherein the opening is sized to mate the first band segment with the exterior channel of the pivot mount.

4. The earmuff assembly of claim 1, wherein the ear pad is configured to surround an ear of a user when the ear cup is worn and wherein the ear loop is configured to rest on a portion of the ear of the user that attaches to a head of the user.

5. The earmuff assembly of claim 1, wherein the pivot mount further comprises an interior channel, the interior channel spaced apart from the exterior channel, wherein the interior channel mates with the outer shell.

6. The earmuff assembly of claim 5, wherein the exterior channel and the interior channel each have an annular shape.

7. The earmuff assembly of claim 1, wherein the first band segment further comprises a rib that surrounds the opening formed in the first end, and wherein the rib mates with the exterior channel.

8. The earmuff assembly of claim 1, wherein the ear loop is positioned below an upper, interior edge of ear pad.

9. The earmuff assembly of claim 1, wherein the ear loop is U shaped.

10. A pair of earmuffs comprising: a first ear cup; a second ear cup; and a band comprising: a first band segment coupled the first ear cup: a second band segment coupled to the second ear cup; an upper band segment coupling the first band segment to the second band segment; a first pivot joint, the first pivot joint coupling the upper band segment to the first band segment; and a second pivot joint that couples the upper band segment to the second band segment; wherein the upper band segment is rotatable about the first pivot joint and the second pivot joint.

11. The pair of earmuffs of claim 10, wherein, when the upper band segment is rotated, the upper band segment moves between a first position in which the upper band segment is positioned above a user's head and a second position in which the upper band segment is positioned behind the user's head.

12. The pair of earmuffs of claim 10, wherein the band further comprises a first joint between the upper band segment and the first band segment and a second joint between the upper band segment and the second band segment.

13. The pair of earmuffs of claim 12, wherein the first joint is separated from the first pivot joint by an offset along a length of the first band segment.

14. The pair of earmuffs of claim 12, wherein the first joint is positioned between a horizontal midplane and a top edge of the first ear cup, and wherein the horizontal midplane is defined between the top edge of the first ear cup and a bottom edge of the first ear cup.

15. The pair of earmuffs of claim 12, wherein the first joint and the second joint are fixed joints such that a first angle between the upper band segment and the first band segment and a second angle between the upper band segment and the second band segment are both fixed.

16. The pair of earmuffs of claim 10, wherein the band is an L shaped band.

17. A pair of earmuffs comprising: a first ear cup; a second ear cup; a band comprising: a first band segment; a second band segment; and a third band segment extending between the first band segment and the second band segment; a first pivot joint that couples the first band segment to the first ear cup; a second pivot joint that couples the second band segment to the second ear cup; a first angle is defined between the third band segment and the first band segment; and a second angle is defined between the third band segment and the second band segment; wherein the band is rotatable about the first pivot joint and the second pivot joint, and wherein the first angle and the second angle are adjustable.

18. The pair of earmuffs of claim 17, wherein the first angle and the second angle are each adjustable between 45 degrees and 135 degrees.

19. The pair of earmuffs of claim 17, wherein the first pivot joint is located at a first apex of the first ear cup and the second pivot joint is located at a second apex of the second ear cup.

20. The pair of earmuffs of claim 17, wherein the first band segment is rotatable about the first pivot joint for 360 degrees with respect to the first ear cup, and wherein the second band segment is rotatable about the second pivot joint for 360 degrees with respect to the second ear cup.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] This application will become more fully understood from the following detailed description, taken in conjunction with the accompanying figures, wherein like reference numerals refer to like elements in which:

[0011] FIG. 1 is an exterior side view of a pair of rear-biased earmuffs with an offset headband, according to an exemplary embodiment.

[0012] FIG. 2 is an exterior side view of a pair of top biased earmuffs with a headband over the cup, according to an exemplary embodiment.

[0013] FIG. 3 is an exterior side view of a pair of earmuffs with a straight headband having an off-center pivot joint, according to an exemplary embodiment.

[0014] FIG. 4 is an exterior side view of a headband rotated above a user's head with a medial pivot and an offset joint, according to an exemplary embodiment.

[0015] FIG. 5 is an exterior side view of the headband shown in FIG. 4, rotated behind the user's head with a medial pivot and an offset joint, according to an exemplary embodiment.

[0016] FIG. 6 is an exterior side view of another headband rotated above the user's head with an offset pivot joint located on the headband, according to another exemplary embodiment.

[0017] FIG. 7 is an exterior side view of the headband shown in FIG. 6, rotated behind the user's head with an offset pivot joint located on the headband, according to an exemplary embodiment.

[0018] FIGS. 8A is an interior side view of an earmuff ear cup, according to an exemplary embodiment.

[0019] FIG. 8B is a schematic front section view of an earmuff ear cup, according to another exemplary embodiment.

[0020] FIG. 8C is an interior side view of an earmuff ear cup, according to another exemplary embodiment.

[0021] FIG. 9 is a perspective view of an earmuff ear cup having a locking pivot cam that selectively adjusts the compressive bias through rotation of the cam to lengthen/shorten the headband, according to an exemplary embodiment.

[0022] FIG. 10 is a perspective view of an earmuff ear cup having a pivot mount, according to another exemplary embodiment.

[0023] FIG. 11 is an exterior side view of the ear cup shown in FIG. 10.

[0024] FIG. 12 is a front view of the ear cup shown in FIG. 10.

[0025] FIG. 13 is a rear view of the ear cup shown in FIG. 10 coupled to the lower segment of an earmuff headband, according to an exemplary embodiment.

[0026] FIG. 14 is a detailed sectional view of the connection between the ear cup and headband segment shown in FIG. 13, taken along line 14-14 in FIG. 13.

[0027] FIG. 15 is an exploded view of an earmuff ear cup and headband segment, according to another exemplary embodiment.

[0028] FIG. 16 is a perspective view of the pivot joint shown in FIG. 10.

[0029] FIG. 17 is an exterior side perspective view of the ear cup and headband shown in FIG. 10 coupled to an upper segment of an earmuff headband and a hard hat clip, according to an exemplary embodiment.

[0030] FIG. 18 is an interior side perspective view of the ear cup, upper and lower headband segments, and hard hat clip shown in FIG. 17.

DETAILED DESCRIPTION

[0031] Referring generally to the figures, various embodiments of earmuffs are shown. Earmuffs are used to protect a user's ears from excessive and/or loud noises. Earmuffs include a headband coupled to a pair of cups (e.g., left and right cups). In various embodiments discussed herein, Applicant has found that providing a headband with a biased or off-center compressive force on the ear cup provides various advantages discussed herein. In particular, Applicant has found that offsetting the pivot location that couples the headband to the earmuffs, from the apex of the ear cup, creates a moment that decouples into a biased force on the seal created between the cup and the user's head. To enhance noise reduction, earmuffs form a seal against the user's head around each ear. In addition, the headband's rotation or movement changes the seal and the pressure created against the user's head. Applicant has found that by moving the pivot connections of the headband on the cups to an off-center location of the cup and/or including separate fixed and/or pivot joints on the headband, the induced moment or biased forces on the cup provides an enhanced seal. Applicant has found that when the headband rotates behind the head, an upwardly compressive bias force (e.g., a moment that creates a compressive force on a top side that is greater than a compressive force on the bottom side of the ear cup) enhances the seal on the cup surrounding the user's ears. The upwardly compressive bias force holds the earmuffs on the user's head, e.g., when the headband is rotated behind the user's head.

[0032] Further, in addition to fortifying the seal of the ear cup around a user's ear, it is also important for a pair of earmuffs to remain secured to a user when not covering the ear, for instance when a user needs to communicate with another individual or receive instructions in between periods of loud noise, when external sound levels are reduced. Applicant has found that the moment and related compressive bias force discussed above also serves to improve the securement of the ear cup against the user's head. Further, Applicant has found coupling a headband to an ear cup through use of a pivot joint to increase the quality and comfort of the ear cup against the back portion of a user's head (e.g., behind the user's ear) or against the exterior of a hard hat.

[0033] In various embodiments, a compressive force is created through coincident pivot locations and/or joints that are located on the headband and/or cups and that bias the cups against a portion of the user's head. A moment is created by orienting a pivot connection and/or headband joint at an off-center location relative to the apex of the cup. This moment generates a bias force that bias's the ear cup against a particular portion of the user's head. In embodiments that include a headband joint, the location at which the headband connects to the ear cup is offset from the headband joint.

[0034] In one embodiment, the headband joint is rigid or fixed, and only one pivot location exists for each cup (specifically, where the headband connects to the ear cup). In another embodiment, the headband joint is a pivot joint that a user adjusts to modify the joint. As used herein, a pivot joint is a location where at least a portion of the headband rotates about a pivot, for example, at the end of the headband (e.g., where the headband connects to the cup, such that the headband pivots or rotates with respect to the cup) or at an offset headband location (e.g., along the headband, such that two portions of the headband pivot with respect to one another).

[0035] A joint on the headband distributes the hoop stresses in the headband to create a compressive force on the cup (e.g., a moment force that decouples into different compressive forces on the outer shell and acts towards the user's head). In certain embodiments, the headband includes a rigid joint, formed by two portions of the headband that do not substantially pivot with respect to one another. In some embodiments, the headband joint is a rigid joint and the headband is coupled to the ear cup by a pivot joint. In other embodiments, the headband joint is a pivot joint, and the headband is fixedly connected to the ear cup, such that the headband does not substantially pivot with respect to the ear cup. In various other embodiments, the headband joint is a pivot joint, and the headband is coupled to the ear cup by a pivot joint. In various other embodiments, the headband does not include any joints and is coupled to an off-center location of the ear cup by a pivot joint.

[0036] FIG. 1 shows rear-biased earmuffs 10 coupled to a rear-mounted headband 11. Specifically, headband 11 is coupled to a location at the rear of an earmuff cup or ear cup 14 and extends away from the rear of the ear cup 14 in a generally rearward direction to wrap around a lower portion of the back of the user's head. FIG. 2 shows top biased earmuffs 12 coupled to a top-mounted headband 13. Specifically, headband 13 couples to both an upper front and an upper back location of the ear cup 14 and extends away from the ear cup in a generally upward direction to wrap around an upper section of the back of the user's head. Earmuffs 10 are substantially the same as earmuffs 12, except for the differences discussed herein.

[0037] With reference to FIG. 1, rear-biased headband 11 of FIG. 1 couples to an ear cup 14 at a rearward off-center location on an outer shell 16 to create a rearward moment. The rearward moment imparts a greater compressive force on the rear side of cup 14 than on the front side of cup 14. As shown in FIG. 2, top-mounted headband 13 couples to an upper off-center location on cup 14 to create a moment that creates a greater compressive force on the top side of cup 14 than on the bottom side of cup 14. Specifically, headbands 11 and 13 couple to off-center locations (e.g., rearward or upward locations) to create respective moments that produce different forces on different sides of respective cup 14. As shown in FIGS. 1 and 2, the off-center location that couples headband 11 (or 13) to cup 14 generates a moment on cup 14. The distribution of the moment generates different compressive forces on opposite sides of the cup 14. In this way, headband 11 (or 13) creates a compressive force that biases the sides of cup 14 in the direction indicated by the arrow 42 (or 44) to squeeze against the user's head and create a seal.

[0038] Cup 14 includes outer shell 16, defining an exterior surface. Cup 14 covers the user's ear, and the compressive forces enhance the seal between cup 14 and the user's head. When the compressive forces on the seal are not equal, a bias exists that pulls the earmuffs 10 in the biased direction. Stated differently, the wedging of cups 14 creates a pulling direction or bias. For example, Applicant has found that changing the location at which headband 13 couples to cup 14, to a location offset from the apex of the cup 14, creates an unequal distribution of forces (e.g., a bias) on cup 14. The biased moment or forces create a compressive pressure on an ear pad, such as pad 418 (shown best in FIGS. 8A-8C) that secures or holds cup 14. The off-center location where headband 13 is coupled to cup 14 creates pressure above the user's ears to hold the earmuffs 12 when headband 13 is rotated or positioned behind the user's head.

[0039] Outer shell 16 defines an exterior surface extending vertically from a top edge 20 to a bottom edge 22 and horizontally from a forward or front edge 24 to a rear edge 26. Collectively, the top edge 20, bottom edge 22, front edge 24, and rear edge 26 form a perimeter of cup 14 and/or outer shell 16. The pad extends around the perimeter to create a soft cushion surface that distributes the compressive forces on the perimeter. For example, the compressive force on top edge 20 is made greater than the compressive force on bottom edge 22 to hold earmuffs 10 on the user's head when headband 11 is rotated and/or positioned behind the head.

[0040] In some embodiments, outer shell 16 defines a curved or rounded exterior surface with a centrally located local maximum, center point, or apex 30 on cup 14. A horizontal midplane 32 is defined halfway between top edge 20 and bottom edge 22. When edges are curved, tangent lines at top edge 20 and/or bottom edge 22 define horizontal midplane 32. Similarly, a vertical midplane 34 is defined halfway between front edge 24 and rear edge 26. In FIG. 1, headband 11 couples to cup 14 towards the rear side of cup 14. Stated differently, headband 11 couples to cup 14 at a location offset from the vertical midplane 34 in the direction of rear edge 26. This off-center joint creates a compressive force on rear edge 26 that is greater (e.g., different) than the compressive force on front edge 24 and wedges earmuffs 10 towards the back of the head.

[0041] Similarly, FIG. 2 shows headband 13 coupled to cup 14 between horizontal midplane 32 and top edge 20. This off-center joint creates a compressive force on top edge 20 that distributes on the pad and securely holds earmuffs 10 to maintain a seal on the user's head, for example, when headband 13 is rotated and/or worn behind the head. Applicant has found that compressive forces (e.g., forces with a vector directed from cup 14 towards the user's head) ensure a secure fit that enhances the seal created against the head. The geometry and/or off-center joint of headband 13 creates the bias force from the decoupled moment. For example, an off-center joint 40 located away from apex 30 creates the bias force to hold the seal when headband 13 is rotated and/or positioned behind the head. In other words, the upward wedging of cups 14 supports the weight of headband 13 when worn behind the user's head.

[0042] FIG. 1 shows a rear offset that creates a bias compressive force in the rearward direction, as indicated by arrow 42 (e.g., the compressive force on rear edge 26 is greater than the compressive force on front edge 24). In FIG. 2, the compressive force along top edge 20 is greater than the compressive force along bottom edge 22 to create an upwardly biased compressive force, as indicated by arrow 44. In other words, headband 13 is located behind the head to create a rearward biased compressive force and above cup 14 to create an upwardly biased compressive force. As used herein, an upwardly biased compressive force means that the force on top edge 20 is different (e.g., greater) than the compressive force on bottom edge 22 to create an upward bias on cups 14. Movement or rotational adjustment of headband 11 also changes the bias forces and/or pressure distributions on the pad. Applicant has found that using the geometry and/or location of headband 13 makes earmuffs 12 selectively adjustable to modify the bias forces and/or pressure distributions.

[0043] FIG. 3 shows earmuffs 50, according to an exemplary embodiment. Earmuffs 50 are substantially the same as earmuffs 10 and/or 12, except for the differences discussed herein. Earmuffs 50 include a straight headband 52 and an off-center pivot joint 40 that couples headband 52 to ear cup 14. The moment that results from this configuration is distributed as a bias force that acts on outer shell 16. Pivot joint 40 is located between horizontal midplane 32 and top edge 20. In various examples, pivot joint 40 is off-center and/or located above horizontal midplane 32. For example, pivot joint 40 is halfway between top edge 20 and horizontal midplane 32, such that a distance between pivot joint 40 and top edge 20 is equal to a distance between pivot joint 40 and horizontal midplane 32. In various embodiments, pivot joint 40 is located nearer to top edge 20 (e.g., shorter distance) than to horizontal midplane 32 (e.g., longer distance). This configuration increases the moment, which increases the compressive bias force and/or pressure on top edge 20. In other various embodiments, pivot joint 40 is nearer to the horizontal midplane 32 (e.g., shorter distance) than to the top edge 20 (e.g., longer distance) to reduce the compressive bias force and/or moment on cup 14.

[0044] FIG. 4 and FIG. 5 show earmuffs 160 with headband 162 according to an exemplary embodiment. Headband 162 is L-shaped with the lower band segment 164 intersecting (specifically, at an intersection 166) the upper band segment 168 at a substantially perpendicular angle (specifically, between 85 and 95 degrees). In this embodiment, intersection 166 defines a rigid or fixed joint 155, meaning the angle defined between the upper band segment 168 and the lower band segment 164 is not adjustable. In other embodiments, this joint may not be rigid or fixed (for example, may be a pivot joint), meaning the angle defined between the upper band segment 168 and the lower band segment 164 may be user adjustable. The lower band segment 164 is coupled to the exterior of ear cup 114.

[0045] Earmuffs 160 are substantially the same as earmuffs 10, 12, and/or 50, except for the differences discussed herein. Additionally, though only one side of the earmuffs 160 are shown here, earmuffs 160 are symmetrical. Thus, for example, the opposite side of earmuffs 160 (not shown) would also include a similar portion of the upper band segment 168 as shown in FIGS. 4 and 5, as well as a second lower band segment that couples to a second ear cup. In this embodiment, a pivot joint 140 is shown at apex 130 of earmuff cup or ear cup 114 (i.e., not off-center). In another embodiment, pivot joint 140 is positioned above horizontal midplane 132. Pivot joint 140 couples the lower band segment 164 to the exterior of ear cup 114. In this embodiment, an offset 170 separates joint 155 from pivot joint 140 along the length of lower band segment 164 and thus creates the off-center joint 155. In this embodiment, the joint 155 is a substantially perpendicular joint (specifically, the angle defined between the upper band segment 168 and the lower segment 164 is between 85 and 95 degrees). In other embodiments the angle formed between the lower band segment 164 and the upper band segment 168 could range between 45 and 135 degrees.

[0046] In FIG. 4, headband 162 is shown in a first position in which upper band segment 168 is rotated above a user's head. Here, joint 155 is positioned in front of, on, near, or over front edge 124 and creates a forward bias (e.g., a compressive bias force and/or pressure on front edge 124 that is greater than the compressive force on rear edge 126). Headband 162 defines an L shaped headband 162 where joint 155 rotates around pivot joint 140 separated from pivot joint 140 by the offset 170. In FIG. 5, headband 162 is shown in a second position in which upper band segment 168 is rotated behind the user's head. Here, joint 155 is positioned above the horizontal midplane and creates an upward bias (e.g., a compressive bias force and/or pressure on top edge 120 that is greater than the compressive force on bottom edge 122). Between the first position and the second position, headband 162 rotates about pivot joint 140.

[0047] FIGS. 6 and 7 show a headband 180, according to an exemplary embodiment. Headband 180 is substantially the same as headband 162 except for the differences discussed herein. FIG. 6 shows headband 180 in a first position in which upper band segment 168 is positioned above the user's head, and FIG. 7 shows headband 180 in a second position in which upper band segment 168 is positioned and locked behind the user's head. Headband 180 has an off-center pivot joint 157. Specifically, upper band segment 168 and lower band segment 164 are pivotably coupled to form pivot joint 157.

[0048] In this embodiment, pivot joint 140, which couples headband 180 to ear cup 114, is selectively lockable and may be locked into a fixed position, such that the position of pivot joint 157 remains stationary between horizontal midplane 132 and top edge 120 of cup 114 as the upper band segment 168 is adjusted. For example, when upper band segment 168 rotates from the first position above the user's head (FIG. 6) to the second position behind the user's head (FIG. 7), the location of pivot joint 157, with respect to ear cup 114, does not change and the lower band segment 164 remains substantially upright or vertical. In other embodiments, the headband 180 can be coupled to ear cup 114 by a fixed connection to the outer shell 116, rather than by a pivot joint.

[0049] In various embodiments of the headband 180, pivot joint 157 is selectively lockable, such that a user can adjust the force needed to rotate the upper band segment 168 about pivot joint 157 with respect to the lower band segment 164. In some embodiments, headband 180 includes multiple (e.g., other/additional) pivot joints 157. In various embodiments, pivot joint 157 is locked, such that the user can rotate pivot joint 157 about the pivot joint 140 without substantially pivoting upper band segment 168 with respect to lower band segment 164 during rotation. In this embodiment, pivot joint 140 and pivot joint 157 are locking pivots, and the offset 170 is measured between pivot joint 140 and pivot joint 157. The user selectively adjusts pivot joint 157 (or pivot joint 140) to the desired friction to lock or unlock the respective pivot(s). The friction at pivot joint 157 determines how much rotation occurs at pivot joint 157 (e.g., located between horizontal midplane 132 and top edge 120) versus how much rotation occurs at pivot joint 140 (e.g., centrally located at apex 130). This enables the user to selectively change the position of pivot joint 157 and/or adjust pivot joint 157 to enhance and/or customize the compressive bias force/pressure when upper band segment 168 is moved or rotated.

[0050] FIGS. 8A-8C show an earmuff cup or ear cup 414 including an extension or ear loop 484 coupled to or extending from a pad 418. It should be noted that the earmuff cup 414 including ear loop 484 can be utilized as part of any earmuff headband including a headband that generates the biased compressive forces discussed herein. In general, ear loop 484 is an extension that is located below an upper, interior edge of pad 418. In this arrangement, when worn by a user, ear loop 484 rests on the portion of the user's ear that attaches to the head. In this manner, ear loop 484, in combination with pad 418, surrounds the upper portion of the user's ear helping to secure the earmuff cup 414 to the user. This arrangement creates a physical/mechanical constraint that hooks the earmuff on the user's ear to provide better support for the cups 414 which in turn acts to reduce earmuff movement due to forces from walking, going down stairs, jumping, other movements, etc.

[0051] As shown best in FIG. 8C, ear loop 484 is a generally D-shaped or U-shaped piece of material (e.g., padded material) that extends between opposing generally vertical portions of pad 418. In this arrangement, ear loop 484 divides the area bounded by pad 418 into lower opening 488 and upper opening 492. When donning earmuffs including cups 414, the user's ear is inserted into lower opening 488 and ear loop 484 is located between the upper portion of the user's ear and the user's head as shown in FIG. 8B. In other words, ear loop 484 creates lower opening 488 to receive the user's ear. Ear loop 484 slides between the ear and the head. As noted, this positioning improves attachment/support to the user's ear and may also act to distribute the compressive bias force over the larger surface area of ear loop 484, which in turn provides a cushion to support the forces that applied to the user's head by the headband.

[0052] In various embodiments, ear loop 484 has a thickness T1 that provides for a larger/increased surface area (as compared to an earmuff cup having only pad 418 in contact with the user's head). In some embodiments, the added padding and positioning of ear loop 484 can help mitigate discomfort from a user's ear pressing against glasses.

[0053] In some embodiments, the surface area acts to distribute the increased compressive bias forces generated by the various headband designs discussed herein. For example, when headband 411 is rotated behind the user's head, increasing the compressive force along top edge 420 enhances the seal and secures the earmuffs 410 against the head as discussed above, ear loop 484 provides additional surface area that helps distribute that force. In such embodiments, ear loop 484 is coupled to pad 418 and distributes the increased compressive force along both top edge 420 of pad 418 and along the surface area located between the user's ear and head.

[0054] FIG. 9 shows another embodiment of an earmuff cup or ear cup 214. Earmuff cup 214 is substantially the same as earmuff cups 14 and 114 except for the differences described herein. Earmuff cup 214 includes a locking pivot cam 290 coupled to the outer shell 216. In this embodiment, cam 290 is positioned at the apex 230 of earmuff cup 214. The locking pivot cam 290 selectively adjusts the compressive bias in a headband, such as headband 11, 13, 52, 162, and/or 180 described above. The user rotates cam 290 to tighten/loosen (e.g., lengthen or shorten) the headband. For example, cam 290 changes hoop stress between the two joints 155 and 140 in headband 162 or the two joints 157 and 140 in headband 180. Thus, rotation of cam 290 increases or decreases hoop stresses in the headband to selectively adjust the compressive bias. In this way, the user can increase the selective bias on top edge of earmuff cup 214 when the headband is rotated behind the head and decrease the compressive bias when headband is rotated above the head.

[0055] FIGS. 10-17 shows an earmuff cup or ear cup 314 according to an exemplary embodiment. Earmuff cup 314 is substantially the same as earmuff cup 14 and/or 114 except for the differences discussed herein. Referring to FIGS. 10-12, a pivot mount 372 is coupled to ear cup 314. Pivot mount 372 could be used in connection with any of the embodiments described herein. As shown here, pivot mount 372 is off set from the apex or center 330 of the ear cup 314. In various other embodiments, the pivot mount 372 is positioned at the center 330 of the ear cup 314. Referring to FIG. 12, an exterior annular channel 374 is formed in the exterior surface of pivot mount 372.

[0056] Referring to FIG. 13, a lower band segment 364 of a band or headband is connected to the pivot mount 372, to form a pivot joint 340. The pivot joint 340 permits both rotational pivoting of the lower band segment 364 about the pivot mount 372 and forward and rearward pivoting of the lower band segment 364 with respect to the ear cup 314. Specifically, a user can, for example, both rotate the lower band segment 364 from an upright position to a rearward position without significantly moving the ear cup, as well as tilt the ear cup 314 from an angle that supports a seal against a user's ear to an angle that supports generally flush securement to a portion of the user's head behind the ear or to the exterior of a hard had, without significantly bending or flexing the headband to accommodate this shift. The pivot joint 340 permits 360-degree rotation of the lower band segment 364 about the pivot mount 372.

[0057] Referring to FIG. 14, a detailed cross section is shown of pivot joint 340. Here, the connection between lower band segment 364 and pivot mount 372 can be seen in greater detail. In this embodiment, lower band segment 364 forms an opening. A rib 378 surrounds the opening. The rib 378 mates with the exterior annular channel 374 to tiltably and rotatably couple lower band segment 364 to pivot mount 372, thus forming pivot joint 340. In this embodiment, rib 378 is an annular rib.

[0058] Referring to FIG. 15, an exploded view of ear cup 314, along with pivot mount 372, is shown. Additionally, FIG. 16 shows a perspective view of the pivot mount 372. In this embodiment, the pivot mount 372 includes an interior annular channel 376 that is spaced apart from the exterior annular channel 374. Upon assembly, a pair of socket covers 379 are secured around the interior annular channel 376 to couple the pivot mount 372 to the outer shell 316 of ear cup 314. The ear cup 314 also includes an ear pad support 387 that supports an earmuff pad 318.

[0059] Referring to FIGS. 17-18, a hard hat clip 382 is shown coupled to lower band segment 364 by an upper band segment 385. In various embodiments, an upper portion of an overhead headband could likewise couple to lower band segment 364. During use, hard hat clip 382 rotatably couples to a user's hard hat, such that ear cup 314 can be rotated from a position covering the user's ear to either a position behind the user's ear, or to a position flush against the exterior of the hard hat without substantial repositioning of the hard hat. As discussed above, the tilting and rotational motions permitted by pivot mount 372 permit the ear cup 314 to secured substantially flush against either the space around a user's ear, the space behind the user's ear, or the exterior surface of the hard hat.

[0060] It should be understood that the figures illustrate the exemplary embodiments in detail, and it should be understood that the present application is not limited to the details or methodology set forth in the description or illustrated in the figures. It should also be understood that the terminology is for the purpose of description only and should not be regarded as limiting.

[0061] Further modifications and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art in view of this description. Accordingly, this description is to be construed as illustrative only. The construction and arrangements shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. Some elements shown as integrally formed may be constructed of multiple parts or elements. The position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. The order or sequence of any process, logical algorithm, or method steps may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes, and omissions may also be made in the design, operating conditions, and arrangement of the various exemplary embodiments without departing from the scope of the present invention.

[0062] For purposes of this disclosure, the term coupled means the joining of two components directly or indirectly to one another. Such joining may be stationary in nature or movable in nature. Such joining may be achieved with the two members and any additional intermediate members being integrally formed as a single unitary body with one another or with the two members or the two members and any additional member being attached to one another. Such joining may be permanent in nature or alternatively may be removable or releasable in nature.

[0063] In various exemplary embodiments, the relative dimensions, including angles, lengths, and radii, as shown in the Figures, are to scale. Actual measurements of the Figures will disclose relative dimensions, angles, and proportions of the various exemplary embodiments. Various exemplary embodiments extend to various ranges around the absolute and relative dimensions, angles, and proportions that may be determined from the Figures. Various exemplary embodiments include any combination of one or more relative dimensions or angles that may be determined from the Figures. Further, actual dimensions not expressly set out in this description can be determined by using the ratios of dimensions measured in the Figures in combination with the express dimensions set out in this description. In addition, in various embodiments, the present disclosure extends to a variety of ranges (e.g., plus or minus 30%, 20%, or 10%) around any of the absolute or relative dimensions disclosed herein or determinable from the Figures.