FIELD OF THE INVENTION
The present invention relates to a door knob that includes a light-emitting indication of its location, which is especially useful in a darkened location.
BACKGROUND OF THE INVENTION
Door knobs are placed on doors that open to allow humans to pass through a doorway, for example. Door knobs are also provided on doors for cabinets and drawers of a chest of drawers, for instance. In a darkened location, it would be desirable to provide light-emitting elements associated with a door knob to visually indicate the location of the door knob. It would be desirable to have the light-emitting elements function without an electrical power source, such as batteries.
The prior art generally addresses these concerns. For instance, U.S. Pat. No. 4,981,314 discloses a doorknob having various portions of an adornment on a door knob treated with a phosphorescent or luminescent material to produce a glowing effect at night or in the dark.
While the foregoing patent generally addresses the foregoing concerns, other concerns are not addressed. For instance, the light-emitting material, phosphorescent or luminescent, of the foregoing patent is exposed to the environment. Such light-emitting material is susceptible to degradation from external influences such as dirt, grime, or perspiration, for instance, from contact by a person's hand. Further, such light-emitting material is subject to wear and tear from abrasion with objects such as a person's hand or a key for a lock in, or near, the knob. Further, it may be desirable to protect one's hand from close contact with some light-emitting material, such as luminescent material energized from a radioactive salt, that could be harmful to a person.
Accordingly, it would be desirable to provide a door knob with a light-emitting location indicator that addresses the foregoing concerns.
SUMMARY OF THE INVENTION
In accordance with one form of the invention, a door knob with a light-emitting location indicator comprises a knob designed for placement on a door, for being grasped by the hand of a user for opening the door. The knob comprises translucent material. One or more objects comprising light-emitting material that either phosphoresces or luminesces are mounted within the knob and are visible through a protective layer of translucent material. The light-emitting material is designed to emit light in a darkened space to thereby visually indicate the location of the knob in the darkened space.
The objects of light-emitting material may comprise a base material that has been painted with paint containing light-emitting material, or it may fully comprise light-emitting material that may be solid or hollow, or some combination of these. As used in this specification and claims, “light-emitting material” embraces the foregoing alternative possibilities.
The light-emitting material in the foregoing door knob is both protected from the environment as well as serving to protect (or prevent) a person from contact with the light-emitting material. As such, the concerns mentioned above are addressed, such as protecting the light-emitting material from degradation due to contact with the environment, for instance.
Other features and objects of the invention will become apparent from the remainder of this specification.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is side view in perspective of a door knob in accordance with an embodiment of the invention.
FIG. 2 is a front view of the door knob of FIG. 1.
FIG. 3 is a fragmentary side view, partially in section, and partially in simplified form, of the left-side portion of the door knob of FIG. 1, showing an arrangement for mounting the knob on a door that closes a passage for human access.
FIG. 4 is a side view, partially in section and partially in simplified form, similar to FIG. 3, but showing an arrangement for mounting the knob to a door of a cabinet, for instance.
FIG. 5 shows a sectional fragment of translucent material of the door knob of FIG. 1, containing a object comprising light-emitting material.
FIG. 6 shows a star-shaped object comprising light-emitting material, showing various dimensions of the star shape.
FIG. 7 shows a fragment of the star shape of FIG. 6 in enlarged form, showing an approximation of an angle of a point.
FIG. 8 shows a fragment of translucent material containing two objects each comprising light-emitting material.
FIG. 9 shows a fragment of translucent material containing two objects comprising light-emitting material having substantially the same shape.
FIG. 10 shows a fragment of translucent material containing an object comprising both light-emitting material and material that does not emit light.
FIG. 11 shows a front view of a door knob containing objects comprising entirely light-emitting material together with a separate object comprising material that does not emit light.
FIG. 12 shows a front view of a door knob and alternative locking mechanisms, mounted on a fragment of a door.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a door knob 10 having a translucent section 12 and a mounting section 14. As shown in FIGS. 1 and 2, translucent section 12 contains one or more objects 16 comprising light-emitting material that either phosphoresce or luminesce, so as to visually indicate the location of the knob in a darkened space. The term “light-emitting material” is defined above, and includes, for instance, paint including light-emitting material that covers a base material which does not emit light.
Translucent section 12 may comprise plastic or other material suitable for use as a door knob, and may be transparent. Section 14 is a section for mounting to a door. FIG. 3 shows knob 10 mounted to a door 20 used to close a doorway for human access. Translucent section 12 is shown in simplified form with phantom lines. Mounting section 14, which may be metal or plastic, for instance, is held to a shaft 22 by a screw 24 in conventional manner. Shaft 22 controls a door latch 25 in conventional manner. FIG. 4 shows an alternative mounting section 14 connected to a door 26 of a cabinet by a screw 28. As in FIG. 3, translucent section 12 is shown in simplified form with phantom lines.
FIG. 5 shows a feature of the invention of an object 30 comprising light-emitting material that is visible through a protective layer of translucent material 32 of translucent section 12 of knob 10 of FIG. 1. Preferably, object 30 is completely surrounded by translucent material 32. More preferably, substantially the entire outer surface of object 30 is intimately surrounded by translucent material 32, for optimum protection of the object.
Preferably, the shapes of the objects comprising light-emitting material are selected to provide a visual interest differing from that of a mere door knob. This can be done by shaping the light-emitting objects in the form of an adornment or scene differing from that of a door knob.
In providing visual interest, one or more of the shapes preferably have respective outlines that are non-circular. For instance, object 30 (FIG. 5) shows a polygonal (star) shape. More preferably, one or more of the outlines may comprise a multi-pointed shape, such as a star shape 36 shown in FIG. 6. The reason is that a multi-pointed shape has a relatively strong attention-focusing power, so as to provide a more prominent visual indication of the location of the door knob in a darkened space.
Guidelines for making prominent points on a shape are described with reference to FIGS. 6 and 7. Preferably, each point 36a (FIG. 7), for instance, approximates an angle 38 substantially less than 90 degrees, and preferably below about 65 degrees, with the length 42 of each point (e.g., 36a) being at least about 15 percent of the maximum dimension 40 (FIG. 6) of an outline of the shape, and more preferably at least about 25 percent of the maximum dimension 40.
As shown in FIG. 8, visual interest can also be imparted to an object comprising light-emitting material by forming it with at least two portions that emit light in respectively different colors. For instance, a butterfly shape 44 in translucent material 46 of a door knob comprises blue portions 48 and 50, pink portions 52, orange portions 53, and green portions 54. All of these portions may emit light, or, for instance, orange portions 53 might not emit light. The combination of such multiple, light-emitting or non-light emitting colors gives a high degree of visual interest to butterfly shape 44, and is pleasing to observe. Additional visual interest is provided by providing another object 51 comprising light-emitting material.
Another way of adding visual interest to objects comprising light-emitting material is to include at least two objects that emit light in respectively different colors, which may be respective, single colors. Thus, FIG. 9 shows, in translucent material 55 of a door knob, a star shaped object 56 of material that emits light only in blue and a star-shaped object 58 of material that emits light only in pink. Objects 56 and 58 are separated from each other.
A still further way of adding visual interest to an object comprising light-emitting material is to include one or more non-light-emitting portions visible in daylight. For instance, FIG. 10 shows, in translucent material 60 of a door knob, a flower-shaped object 62 with portions 64 that emit light in pink, whereas interior portions 66 of the object comprise non-light-emitting portions 66 that are brown. Flower-shaped object 62 will have a considerably different appearance in a darkened space than in daylight. This adds a changing perspective to the visual appearance of the object. Additionally, the inclusion in translucent material 60 of another object 61 comprising light-emitting material adds more visual interest.
FIG. 11 shows a door knob 64 including a translucent section 66 and a mounting section 14. Contained within translucent section 66 are objects 68 with outlines of stars and an object 70 with an outline of a crescent moon. The portions of star-shaped objects 68 visible in FIG. 11 are entirely light-emitting. In contrast, the visible portion of crescent moon-shaped object 70 is non-light emitting. This creates a type of changing perspective to the visual appearance of the objects that differs from that described in connection with FIG. 10. Of course, not all portions of objects 68 need to emit light, as is apparent from the above discussion of FIG. 10.
FIG. 12 shows a door knob 74 and optional locking mechanism 76 mounted on a door 78. Knob 74 may contain an optional locking mechanism 80 having a keyhole 82 for receiving a key (not shown). Similarly, optional locking mechanism 76 includes a keyhole 84 for receiving a key (now shown). With both locking mechanisms, a person over time may repeatedly press a key towards one of the keyholes and might miss the keyhole. According to an aspect of the invention, objects 86, within knob 74, comprising light-emitting material are protected from damage due to a person missing the keyhole and accidentally pressing the key against the knob.
While the invention has been described with respect to specific embodiments by way of illustration, many modifications and changes will occur to those of ordinary skill in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit and scope of the invention.
Patent Grant
7185929
