a is a perspective view of an alternative embodiment of the hinge assembly of
a is a cross-sectional view of the hinge assembly of
a is a bottom plan view of an alternative embodiment of the hinge assembly configuration shown in
The present invention is directed to a friction hinge assembly 12 for pivotably mounting a video display screen 10 (shown in
According to the present invention, a friction hinge assembly 12 is used to pivotably attach a video display screen 10 to the ceiling of a vehicle. The hinge assembly 12 is preferably constructed of metal, although other material can be utilized. With the use of the hinge assembly 12, the video display screen 10 can be pivoted downward from a generally horizontal storage position on the ceiling of a vehicle to any suitable desired angled position, preferably within about 90 degrees from the storage position. In the storage position, the video display screen 10 will preferably be generally parallel to or in planar alignment with or recessed in the ceiling of the vehicle. The hinge assembly 12 allows the video display screen 10 to be moved between a storage position and a deployed position. The hinge assembly 12 also frictionally maintains the video display screen 10 at a desired position anywhere between the storage position and the deployed position.
Referring now to the drawings, the hinge assembly 12 comprises a base 14 at least a portion of which can be attached to the ceiling of a vehicle. The base 14 is a stationary component that will not pivot when the moveable members of the hinge assembly 12 rotate and the video display screen 10 unit is pivoted. The base 14 is preferably L-shaped with a long arm 16 that is mounted to the ceiling and a short arm 18 with a generally circular opening that allows for the attachment of the short arm 18 of the base 14 to the remainder of the hinge assembly 12. The long arm 16 can be connected to the ceiling in any number of ways, including, but not limited to, through the use of at least one fastener or welding. If a fastener is used to connect the base to the ceiling, then the long arm 16 can include at least one opening 20 to receive the fastener. As demonstrated in
The hinge assembly 12 also comprises a pin 22 with a first end 23 and a second end 24. The first end 23 of the pin 22 is inserted through at least the opening of the short arm 18 of the base 14. The first end 23 of the pin 22 and second end 24 of the pin 22 extend in either direction of the opening of the short arm 18 of the base 14. The pin 22 allows for the attachment of the other components of the hinge assembly 12 to the base 14 and specifically the short arm 18.
The hinge assembly 12 also comprises a video display bracket 26 that can be connected to a video display screen 10. The bracket 26 contains at least one opening to allow the first end of the pin to be inserted and thereby attach the bracket to the remainder of the hinge assembly 12. The bracket 26 may also have a second opening 27 to allow the bracket to be connected to the video display screen 10. The bracket 26 can be connected to the video display screen 10 in any number of ways, including, but not limited to, through the use of at least one fastener or by welding. Additionally, through the use of a desired fastener, the bracket 26 may be constructed so that the video display screen 10 can be detached or reattached as desired. Such feature can be useful for maintenance, removal or replacement of the video display screen 10. When the hinge assembly 12 is complete, the bracket 26 will pivot relative to the base 14 thereby allowing the video display screen 10 to pivot relative to the ceiling. As demonstrated in
In one embodiment of the present invention, the bracket 26 and the short arm 18 of the base 14 can be separated by at least one spacer 28 to allow for a smoother rotation of the hinge assembly 12. In such embodiment, if the short arm 18 of the base 14 is already attached to the pin 22, the spacer 28 would be inserted onto the pin 22 before the bracket 26. The spacer 28 can be formed as a part of the bracket 26 or the spacer 28 can be formed as a separate component.
As shown in
The hinge assembly 12 also comprises at least one resilient washer 30 for applying axial compressive resilience to the hinge assembly 12. For instance, the resilient washer 30 can by a Belleville washer, spring washer, curved washer or tension washer. The resilient washer 30 has a generally circular shaped opening and is placed on the pin 22 through the opening. The resilient washer 30 is preferably disposed between the stationary short arm 18 of the base 14 and at least one movable part of the hinge assembly 12. The resilient washer 30 prevents the friction that is created during rotation of the hinge assembly 12 from locking the movable and stationary parts together during torque adjustment. Furthermore, the use of at least one resilient washer 30 will function place a load axially along the pin to limit axial movement of the components of the hinge assembly 12 along the pin 22 during rotational movement of the moveable components of the hinge assembly 12 around the pin 22. Unlike springs or other similar types of devices, the resilient washer 30 will maintain constant torque regardless of the position of the hinge assembly 12. Accordingly, the use of at least one resilient washer 30 can function to prevent malfunction and undue wear and tear of the hinge assembly 12. In one embodiment of the present invention, multiple resilient washers 30 are used to provide adequate flexibility by producing a higher torque or a hinge assembly 12 with higher loading capacity.
The hinge assembly can also incorporate a support member 32 that is inserted onto the pin 22 adjacent to the resilient washer 30. The support member 32 has a generally circular shaped opening and is placed on the pin 22 through the opening. The support member 32 is preferably generally the same diameter as the resilient washer 30. If a support member 32 is utilized and in position on the pin 22 it serves to compress the resilient washer 30.
The hinge assembly 12 can also include, if desired, a cam 34 that is preferably placed on the pin 22 closest to the first end 23 of the pin 22. The cam 34 functions to, among other things, perform a reciprocating action when the hinge is moved, such as activating or deactivating a switch. Accordingly in one embodiment of the invention, when the movable parts of the hinge assembly 12 rotate, the video display screen 10 pivots downward from the storage position and the cam 34 serves to activate a switch to automatically turn the video display screen 10 on. Alternatively, when the movable parts of the hinge assembly 12 rotate back to their initial position, the video display screen 10 pivots upward to the storage position and the cam 34 serves to deactivate a switch to automatically turn the video display screen 10 off.
For clarity in describing the function and placement of each component of the hinge assembly 12, the above-identified representative example of placement of hinge assembly 12 components on the pin 22 has been used. One skilled in the art will understand that the present invention can be assembled in numerous different ways and the components can be inserted through an end of the pin 22 in different order than has been described herein. For example, the cam 34 can be placed on the pin 22 first, then the support member 32, then at least one resilient washer 30, then the short arm 18 of the base 14, then a spacer 28 and finally the bracket 26.
In one embodiment of the present invention, the hinge assembly 12 can also include a second cam 36. The second cam 36 has an opening and is also placed on the pin 22 through the opening. When the movably parts of the hinge assembly 12 rotate on the pin 22 relative to the base 14, the second cam 36 also rotates, thereby allowing the hinge assembly 12 to perform at least one additional function. For example, the second cam 36 may be formed with at least one lobe 38 and the base 14 of the hinge assembly 12 can incorporate at least one flange. As shown in
If the second cam 36 incorporates at least one lobe 38, when the lobe 38 rotates relative to the pin 22 with the remainder of the moveable parts of the hinge assembly 12, the lobe 38 will temporarily snap into the detent 44 on the first flange 40 or second flange 42 and the entire hinge assembly 12 will stop rotating. This feature allows for repeatable soft stops. Accordingly, the detent 44 and lobe 38 may be positioned such that when the movably parts of the hinge assembly 12 are rotated, the video display screen 10 can be easily lowered to certain predetermined ideal viewing positions. In one embodiment of the present invention, the second cam 36 is equipped with two lobes and the first flange 40 and the second flange 42 each incorporate one detent 44. In this embodiment, both lobes will snap into their respective detents simultaneously. Alternatively, the lobe 38 and detent 44 can serve to prohibit the hinge assembly 12 from over rotating beyond a position that is 90 degrees from the horizontal storage position. The base 14 and specifically the long arm 16 of the base 14, may also be equipped with at least one detent that accepts at least one lobe from the second cam 36. Furthermore, as demonstrated in
In one embodiment of the present invention, an angled support member 33 can also be used to support the pin 22 if a second cam 36 is present. As demonstrated in
In one embodiment of the present invention, as shown in
In one embodiment of the present invention, as shown in
As shown in
Furthermore, for added support and stability of the video display screen 10, both a right handed hinge assembly 48 and a left handed hinge assembly 50 may be utilized together as demonstrated in
Furthermore, as demonstrated in
As demonstrated in
Although the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the spirit or scope of the invention. Various examples of such changes have been given in the foregoing description. Accordingly, the disclosure of embodiments of the invention is intended to be illustrative of the scope of the invention and is not intended to be limiting. It is intended that the scope of the invention shall be limited only to the extent required by the appended claims. For example, to one of ordinary skill in the art, it will be readily apparent that the hinge assembly 12 discussed herein may be implemented in a variety of embodiments, and that the foregoing discussion of certain of these embodiments does not necessarily represent a complete description of all possible embodiments. Additionally, benefits, other advantages, and solutions to the problems have been described with regard to specific embodiments. The benefits, advantages, solutions to problems, and any element or elements that may cause any benefit, advantage, or solution to occur or become more pronounced, however, are not to be construed as critical, required, or essential features or elements of any or all of the claims.