Writing instrument with spool valve

Abstract

A writing instrument may include an upper pen barrel rotatably connected to a lower pen barrel. A spool valve and fluid reservoirs may be housed in the upper pen barrel. A writing tip secured to the lower pen barrel may be in selective fluid communication with the fluid reservoirs. The upper pen barrel may be rotatable relative to the lower pen barrel of the writing instrument.

Claims

1. A writing instrument, comprising: a) an upper pen barrel and a lower pen barrel; b) a spool valve connecting said upper pen barrel to said lower barrel; c) a writing tip removably secured to a lower distal end of said lower pen barrel; d) an ink cartridge removably received in a spool cavity of said spool valve, said ink cartridge including a plurality of ink reservoirs in fluid communication with said writing tip; and e) said lower pen barrel including an ink pathway port, wherein rotation of said spool valve relative to said lower pen barrel aligns a respective one of said ink reservoirs with said ink pathway port.

2. The writing instrument of claim 1 wherein said spool valve includes a reduced diameter portion and a spindle extending downwardly from said reduced diameter portion.

3. The writing instrument of claim 2 including a transverse wall extending across a distal end of said reduced diameter portion of said spool valve, a plurality of fluid passageways extending from said ink reservoirs terminating at respective outlet holes in said transverse wall.

4. The writing instrument of claim 3 wherein said lower pen barrel includes a recessed cavity extending from an open upper end of said lower pen barrel, a lower end of said recess cavity defined by a seal having a planar surface extending transverse to a longitudinal axis of said lower pen barrel, said seal including a center hole concentric with the longitudinal axis of said lower pen barrel and a fluid pathway port offset from said center hole wherein said spindle extends through said center hole of said seal.

5. The writing instrument of claim 4 including a biasing member threaded on said spindle and a nut threaded on a distal end of said spindle abutting said biasing member.

6. The writing instrument of claim 5 wherein rotation of said spool valve relative to said lower pen barrel aligns one of said fluid passageways with an ink pathway port in said lower pen barrel establishing fluid communication between said writing tip and a respective one of said ink reservoirs.

7. The writing instrument of claim 4 wherein said seal includes an ink pathway port offset from said center hole.

8. The writing instrument of claim 2 including a plurality of detents formed in a circumferential shoulder circumscribing said reduced diameter portion of said spool valve, said detents configured to receive a spring-loaded pin mounted on a distal end of said lower pen barrel.

9. The writing instrument of claim 8 including visual indicators providing visual indication of alignment of a respective one of said fluid passageways with said ink pathway port.

10. The writing instrument of claim 1 wherein said lower pen barrel includes a transparent portion.

11. The writing instrument of claim 10 including a battery powered light embedded in said transparent portion of said lower pen barrel to illuminate a region of said lower pen barrel where mixing of ink colors occurs.

12. The writing instrument of claim 1 including a seal disc configured for receipt in a recessed cavity extending from an open distal end of said lower pen barrel, said seal disc including a center hole and a fluid pathway port radially offset from said center hole.

13. The writing instrument of claim 1 including a ridge on an exterior surface of said lower pen barrel, said ridge defining an air passage in fluid communication with said ink cartridge.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) So that the manner in which the above recited features, advantages and objects of the present invention are attained can be understood in detail, a more particular description of the invention briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.

(2) It is noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.

(3) FIG. 1 is a perspective view of a writing instrument.

(4) FIG. 2 is a partial exploded perspective view of the writing instrument shown in FIG. 1.

(5) FIG. 3 is a second partial exploded perspective view of the writing instrument shown in FIG. 1.

(6) FIG. 4 is a partial exploded perspective view of a second embodiment of a writing instrument.

(7) FIG. 5 is a second partial exploded perspective view of the writing instrument shown in FIG. 4.

(8) FIG. 6 is a partial perspective view of a writing instrument showing hidden lines and a viewing portion of the writing instrument.

DETAILED DESCRIPTION

(9) As used herein the term fluid means inks, paints, dyes, pigments, water, alcohol, mixing solutions, surfactants and other flowable fluids suitable for marking on a substrate material, such as paper and the like.

(10) Referring first to FIG. 1, a writing instrument is generally identified by the reference numeral 100. For purposes of illustration, but not by way of limitation, the writing instrument 100 depicted in the drawings is a fountain pen and will hereinafter be referred to as a pen.

(11) The pen 100 may include an upper pen barrel 112 and a lower pen barrel 114 rotatably connected to one another. A writing nib 116 may be removably secured to the lower end of the lower pen barrel 114 in a manner known in the art. As noted above, the pen 100 is not limited to a fountain pen and therefore the writing nib 116 may comprise a ball point and/or roller ball point, as well as a felt tip wiring point and the like.

(12) The upper pen barrel 112 may house a spool valve 118 and an ink cartridge 120 (shown in FIG. 4). An elongated spindle 122 may be fixedly secured to the spool valve 118. The spindle 122 may be coaxial with the longitudinal axis of the spool valve 118 and extend downward from a lower distal end of the spool valve 118.

(13) An upper portion 124 of the spool valve 118 may form a spool cavity 125 open at its upper end and closed at its lower end by a transverse bottom wall 128 (shown in FIG. 4). The spool cavity 125 may be divided by wall members 130 extending upward from the transverse bottom wall 128 to form a plurality of chambers 132. The chambers 132 may include conduits 136 projecting upward from the bottom of the spool body 121 cavity 125. The conduits 136 may define passageways 138 for directing ink from the ink reservoirs 133, 134, 135 to the lower pen barrel 114.

(14) While three chambers 132 are depicted in the drawings, it is understood that the cavity 125 may be divided to include fewer or a greater number of chambers 132 corresponding to the number of ink reservoirs 133, 134, 135 forming the ink cartridge 120. The inner profile of the chambers 132 may correspond to the outer profile or shape of the ink reservoirs 133, 134, 135 so that the ink cartridge 120 may be inserted and retained in the cavity 125 by friction fit connection. The ink reservoirs 133, 134, 135 may each contain a unique ink color. The ink cartridge 120 may comprise an ink cartridge design sealed at the factory and reusable. A user may fill the ink reservoirs 133, 134, 135 with an eyedropper and the like. Alternatively, the ink cartridge 120 may be of a higher quality design with superior seals, etc, and provided to the user empty so that the user may fill the ink reservoirs 133, 134, 135 with ink colors selected by the user. The ink cartridge 120 may be installed by inserting the ink reservoirs 133, 134, 135 into respective chambers 132 onto the conduits 136 and sealed therewith by friction connection between the conduits 136 and respective reservoirs 133, 134, 135.

(15) The spool valve 118 may include a reduced diameter lower portion 139 terminating at a transverse bottom wall 126. The reduced diameter portion 139 may include circumferential grooves 140 for receiving o-rings 142 which may slidably engage with an inner surface of a recessed cavity 146 of the lower pen barrel 114. The o-rings 142 may provide a secondary seal in the event that any ink weeps out and moves along the spool valve 118. However, the o-rings 142 may be omitted if close tolerances are maintained during manufacturing. In any event, one or more o-rings 142 may provide an additional barrier to prevent ink leakage. The ink passageways 138 formed by the conduits 136 may terminate at respective outlet holes 143, 144, 145 in the bottom wall 126 of the reduced diameter portion 139 of the spool valve 118.

(16) Referring now to FIG. 3, the lower pen barrel 114 may be configured for mating engagement with the spool valve 118. The upper distal end of the lower pen barrel 114 may define a recessed cavity 146. The bottom of the cavity 146 may be a transverse planar seal 148. The seal 148 may be a poured in place seal, such as silicone and the like. The seal 148 may include a spindle hole 150 and an ink pathway port 152 radially offset from the spindle hole 150. Upon assembly of the spool valve 118 with the lower pen barrel 114, the spindle 122 extends through the spindle hole 150 and the reduced diameter lower portion 139 of the spool valve 118 is received in the cavity 146 of the lower pen barrel 114. A spring 154 disposed between washers 156 may be threaded on the spindle 122. A cap nut 158 may be threaded on the spindle 122 and tightened to compress the spring 154 and thereby provide a compressive biasing force against the seal 148 forcing it into facing contact with the bottom wall 126 of the lower portion 139 of the spool valve 118. Typically, the spring 154 may limit and regulate the compressive force at the seal 148 to about 5-10 pounds to ensure a liquid tight rotary connection.

(17) It may be observed that the seal 148 includes a single ink pathway port 152. Ink may be directed to the writing nib 116 by aligning outlet holes 143, 144, 145 in the bottom wall 126 of the spool valve 118 with the ink pathway port 152 by rotating the spool valve 118 relative to the lower pen barrel 114. Detents 160 may be provided in the circumferential shoulder 162 circumscribing the reduced diameter lower portion 139 of the spool valve 118 for accurate alignment of the ink pathway port 152 with any one of the outlet holes 143, 144, 145 of the spool valve 118. The detents 160 may be engaged by a spring-loaded pin 164 fixedly secured to the upwardly facing distal edge 166 of the lower pen barrel 114.

(18) The detents 160 may be arranged about 60 degrees apart so that a tactile and audible indication may be provided at every 60 degrees of rotation of the spool valve 118 relative to the lower pen barrel 114. As there may be periods of time, such as when the pen 100 is not in use or is in transport, it may be desirable to shut off the supply of ink to the writing nib 116. As the outlet holes 143, 144, 145 in the spool valve 118 are equally spaced apart, about 120 degrees, every 60 degrees of rotation of the spool valve 118 relative to the lower pen barrel 114 will either align one of the outlet holes 143, 144, 145 with the ink pathway port 152 or misalign with the ink pathway port 152, and thereby ensure that the flow of ink to the writing nib 116 is shut off. As each detent 160 aligns with the spring-loaded pin 164 a click may be heard indicating that ink flow to the writing nib 116 is on or off.

(19) A visual indication as to whether the pen 100 is in the on or off position may also be provided. Alignment tabs may be fixedly secured about the periphery of the lower pen barrel 114 proximate the distal edge 166 thereof. Upon alignment of the on tab 168 with one of the indicators 170 fixedly secured about the periphery of the upper portion 124 of the spool valve 118, the selected ink color may flow through a respective passageway 138 to the writing tip 116. The indicators 170 may be aligned with the detents 160 corresponding to the on or ink flow position. The indicators 170 may be labeled to indicate the corresponding ink reservoir 133, 134, 135 associated with the respective indicator 170. For example, but without limitation, the indicators 170 depicted in the drawings may be labeled 1, 2, and 3 to identify the respective ink reservoirs 133, 134, 135. The user may then easily determine whether a particular ink color in the ink reservoirs 133, 134, 135 is aligned for delivery to the writing nib 116.

(20) When the pen 100 is not in use, one of the indicators 170 may be aligned with an off tab 169 fixedly secured about the periphery of the lower pen barrel 114. In the off position the ink passageways 138 are misaligned with the ink pathway port 152 so that the flow of ink to the writing nib 116 may be blocked. A tab 171 fixedly secured about the periphery of the lower pen barrel 114 may correspond to position of the lower pen barrel 114 relative to the to the spool 118 where the ink pathway port 152 is always blocked.

(21) Referring now to FIGS. 4 and 5, an alternate embodiment of the pen 100 may include a seal disc 172 which is pre-molded or cast to the appropriate shape to fit in cavity 146 of the lower pen barrel 114. The seal disc 172, may for example, be 60 Shore A silicone, or a cast and polished ceramic material. The seal disc 172 may include a spindle hole 250 and an ink pathway port 252 radially offset from the spindle hole 250. The seal disc 172 may be provided with various contours, including bosses 174, or splines and the like so that when installed the seal disc 172 does not rotate relative to the lower pen barrel 114. For example, but without limitation, the bottom wall of the recessed cavity 146 may be provided with recesses 176 so that the bosses 174 may nest therein and secure the seal disc 172 in the cavity 146 of the lower pen barrel 114.

(22) The lower pen barrel 114 may include a ridge 178 on the exterior surface thereof. The ridge 178 may be generally oriented upward to facilitate downward flow of ink and upward passage of air as the ink in each of the reservoirs 134 is consumed and displaced with air. The orientation of the ridge 178 may not be of consequence for ball point pen designs and inks having a relatively higher viscosity.

(23) Referring now to FIG. 6, the lower pen barrel 114 of the pen 100 may include a transparent portion. An LED light 180 and a battery 182 may be imbedded in the transparent portion of the lower pen barrel 114. The light 180 may illuminate the region of the lower pen barrel 114 where mixing of the ink colors may occur, thereby permitting the user to view the color of the ink mixture flowing toward the writing nib 116.

(24) The pen 100, as noted above and depicted in the drawings, is a fountain type pen for illustrative purposes only. It is understood that the pen 100 described herein may include, but is not limited to, ball point pens with viscous ink (considered paste), pens with generally decreasing ink viscosity ranging from tempura pens, gel pens, roller ball pens, brush tip pens, fountain pens, stylus pens, and/or felt tip pens, of both water or alcohol base and the like.

(25) The pen 100 may be suitable for a wide range of uses such as a simple novelty item to being able to continuously and smoothly cause a transition of colors while creating a drawing, sketch and the like, and where no two sketches or drawings are identical, even with identical pen motions, because of the somewhat turbulent flow and the complex nature of the physics of a flowing fluid. Viscosity alone is a complex and somewhat chaotic factor to consider, as well as the dynamics of the spool valve or other valves, such as disk valves or pinch valves.

(26) The subtractive color system, described in greater detail hereinabove, applies to the pen 100. The full color spectrum may be possible with the ink colors magenta, yellow, and cyan. Generally, pen 100 may be considered a color shifting pen utilizing three reservoirs (or three cartridge) of compatible or mixable inks. Color shifting pens may be controlled with the spool valve described hereinabove. The pen 100 may be used for various purposes, such as, notarizing documents or dealing with legal matters, or even writing a diary. The chronological order of the written words, characters and the like may be determined by the ink color. If insertions occur out of sequence, the color of such insertions provides an indication as to the general time period, based upon the ink color, that such insertions were made. In this respect, the use of color may greatly assist in the prevention of fraud and forgeries. Note that it would be very difficult to re-blend the identical ink color. Forensic document examination may also be greatly facilitated. The reader will note that the chronological order is not actually a function of time, but rather a function of the number of words, characters and the like the pen has written. Furthermore, in addition to ink, fluorescent dyes which fluoresce under ultraviolet light may be introduced into one or more of the reservoirs, for example, in order to introduce unique graduations which would only be visible under UV light.

(27) Continuing again with ink mixtures, the ink colors throughout a sketch, drawing or writing are a smooth transition of many colors, hues, and shades. A user may create the sketch or drawing while controlling and anticipating the colors being mixed and/or blended and delivered to the writing tip. For example, while shades of yellow are being delivered to the writing tip, the sun or yellow objects may be sketched, and as the user introduces green blended ink, then plants and/or green objects may be sketched. Furthermore, during color mixing, and particularly when utilizing fountain pens, it should be noted that the quantity of ink colors available in the market is high, and the user may elect to deviate from the three subtractive primary colors discussed above and select non-primary colors which, for example, may result in mixtures of pastel colors. Alternatively, scarlet, purple and/or green ink may be included in at least one of the reservoirs to emphasize a particular mixable range of colors. Also, for steady delivery of a mixed color or shade, positioning the spool valve to a predetermined intermediate position between two fluid reservoirs, both in the on mode in some portion (throttling), steady state mixing action may occur while writing.

(28) All colors are possible with the three reservoir configuration of the pen 100 where the primary subtractive colors are provided. With regard to secondary colors, if the primary subtractive colors of yellow, cyan, and magenta are provided, then a secondary color such as red, green or blue may be mixed and delivered to the pen mixing chamber, and once such a color is in the mixing chamber, a new primary color may be introduced resulting in colors such as violet, rose, orange, chartreuse green, spring green, and azure to be mixed within the pen mixing chamber and thereafter delivered to the writing tip. Further variations when combining tertiary and secondary colors, or tertiary and tertiary colors, or any combination of the above colors are also possible, thus enabling a remarkably wide variation of the number of colors, shades and hues which may be gradually mixed within the pen mixing chamber during the act of writing.

(29) While various embodiments of the invention have been shown and described herein, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims which follow.