CA2499834C - Auto-retractable pen with ferromagnetic attachment - Google Patents
Auto-retractable pen with ferromagnetic attachment Download PDFInfo
- Publication number
- CA2499834C CA2499834C CA 2499834 CA2499834A CA2499834C CA 2499834 C CA2499834 C CA 2499834C CA 2499834 CA2499834 CA 2499834 CA 2499834 A CA2499834 A CA 2499834A CA 2499834 C CA2499834 C CA 2499834C
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- CA
- Canada
- Prior art keywords
- pen
- cap
- ink cartridge
- permanent magnet
- auto
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K23/00—Holders or connectors for writing implements; Means for protecting the writing-points
- B43K23/001—Supporting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
- B43K24/02—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K25/00—Attaching writing implements to wearing apparel or objects involving constructional changes of the implements
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- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Abstract
An auto-retractable pen comprises a pen and a cap. The pen comprises a hollow case, an ink cartridge, a mechanical spring and a mobile magnetic element. The cap comprises a cap body and a stationary permanent magnet.
The pen or the cap comprises a ferromagnetic element. The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap. The writing tip of the pen retracts into the hollow case of the pen when an upward magnetic attraction force becomes greater than a downward mechanical expansion force. The ferromagnetic element provides an increase in strength of the magnetic attachment force by concentrating magnetic flux lines. This invention relates to retractable pens, and the principal use of the invention is for operating a pen with a single hand.
The pen or the cap comprises a ferromagnetic element. The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap. The writing tip of the pen retracts into the hollow case of the pen when an upward magnetic attraction force becomes greater than a downward mechanical expansion force. The ferromagnetic element provides an increase in strength of the magnetic attachment force by concentrating magnetic flux lines. This invention relates to retractable pens, and the principal use of the invention is for operating a pen with a single hand.
Description
Description Title = Auto-Retractable Pen with Ferromagnetic Attachment Technical Field = This invention relates to retractable pens, more particularly to an auto-retractable pen.
Background Art = There are many instances where it would be desirable to be able to provide a retractable pen with a mechanism to allow a user to magnetically attach a pen to a cap in a single-hand operation, and to simultaneously retract the writing tip.
= A number of patents disclose retractable pens.
= U.S. Patent 6 394 677 discloses "Hanging pen and cord thereof". This prior art pen has a pen cap, and a penholder. The pen cap has a blocking cover with a loop cord for carrying and an opening at the other end. The penholder provides a center stick therein with a writing head of the center stick extending outwardly from a conical part at an end of the penholder. A magnetic ring is fixed in the pen cap. The conical part is made of magnet inducing material. The pen cap engages the penholder by way of the magnetic ring attracting the conical part when the conical part is inserted into the pen cap from the open end.
= This prior art does not provide a retractable pen with a mechanism to allow a user to magnetically attach a pen to a cap in a single-hand operation. In addition, prior art retractable pens do not simultaneously retract the writing tip when the pen is attached to the cap. Moreover, prior art retractable pens do not provide a cushion effect to the writing tip.
= Canadian Application 2 429 153 discloses "Auto-Retractable Pen mechanism with a Cushion Effect". However, this prior art provides weak magnetic attachment between the pen and the cap. Moreover, this prior art does not provide no-glue construction.
Description of the Invention = It is a primary object of the invention to provide an auto-retractable pen in which a pen magnetically attaches to a cap in a single-hand operation by the user.
= It is another object of the invention to provide an auto-retractable pen which simultaneously retracts the writing tip when the pen is attached to the cap.
= It is another object of the invention to provide an auto-retractable pen in which the pen stays upside up and downside down when attached to the cap.
= It is another object of the invention to provide an auto-retractable pen which has a cushion effect.
= It is another object of the invention to provide an auto-retractable pen which has a loop-shaped cord to be worn by the user around his/her neck.
= It is another object of the invention to provide an auto-retractable pen which has ferromagnetic elements in order to enhance the magnetic attachment between the pen and the cap.
= It is another object of the invention to provide an auto-retractable pen which has ferromagnetic elements in order to enable no-glue construction so that the polarity of the magnets (N, S) can be reversed after the construction.
= An auto-retractable pen comprises a pen and a cap. The pen comprises a hollow case, an ink cartridge, a mechanical spring and a mobile magnetic element. The cap comprises a cap body and a stationary permanent magnet.
The pen or the cap comprises a ferromagnetic element. The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap. The writing tip of the pen retracts into the hollow case of the pen when an upward magnetic attraction force becomes greater than a downward mechanical expansion force. The ferromagnetic element provides an increase in strength of the magnetic attachment force by concentrating magnetic flux lines.
Brief Description of the Figures in the Drawings = In drawings which illustrate embodiments of the invention:
o Figure 1 marked "Prior Art" is a sectional view of a conventional auto-retractable wearable pen in a detached position;
o Figure 2 is a sectional view of one embodiment of an auto-retractable wearable pen in a detached position according to the invention;
o Figure 3 is a sectional view of another embodiment of an auto-retractable wearable pen in a detached position according to the invention;
o Figure 4 is a sectional view of another embodiment of an auto-retractable wearable pen in a detached position according to the invention; and o Figure 5 is a sectional view of the invention of Figure 4 in an attached position.
Modes for Carrying Out the Invention = A conventional auto-retractable wearable pen shown in Figure 1 marked "Prior Art" in a detached extended position comprises a pen and a cap.
= The pen comprises a hollow case 1-1, an ink cartridge 1-2, a mechanical spring 1-3 for downwardly biasing the ink cartridge 1-2, and a mobile magnetic element 1-4.
= The hollow case 1-1 of the pen has a closed end, a narrow middle portion and an open conical end.
= The ink cartridge 1-2 of the pen has a top end, a fat portion and a writing tip. The ink cartridge 1-2 is slidably mounted inside the hollow case 1-1. The writing tip of the ink cartridge 1-2 is capable of penetrating through the open conical end of the hollow case 1-1.
= The mechanical spring 1-3 of the pen is concentrically mounted around the ink cartridge 1-2 between the narrow middle portion of the hollow case 1-1 and the fat portion of the ink cartridge 1-2.
= The mobile magnetic element 1-4 of the pen is securely attached to the top end of the ink cartridge 1-2.
= The cap comprises a cap body 2-1 and a stationary permanent magnet 2-2 for providing a magnetic attraction force.
= The cap body 2-1 of the cap has a top end and a bottom end.
= The stationary permanent magnet 2-4 of the cap is securely attached to the bottom end of the cap body 2-1.
= The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element 1-4 of the pen in proximity to the stationary permanent magnet 2-4 of the cap. The writing tip of the ink cartridge 1-2 of the pen retracts into the hollow case 1-1 of the pen when an upward magnetic attraction force between the mobile magnetic element 1-4 of the pen and the stationary permanent magnet 2-4 of the cap becomes greater than a downward mechanical expansion force by the mechanical spring 1-3 of the pen.
= The downward mechanical expansion force by the mechanical spring 1-3 of the pen provides a cushion effect to the writing tip of the ink cartridge 1-2 of the pen.
= This prior art requires glue to securely attach the mobile magnetic element 1-4 of the pen to the top end of the ink cartridge 1-2, and also the stationary permanent magnet 2-4 of the cap to the bottom end of the cap body 2-1. These connections are permanent, so the mobile magnetic element 1-4 and the stationary permanent magnet 2-4 are not detachable.
= In one embodiment of the invention shown in Figure 2 in a detached extended position, an auto-retractable pen comprises a pen and a cap.
= The pen comprises a hollow case 3-1, an ink cartridge 3-2, a mechanical spring 3-3 for downwardly biasing the ink cartridge 3-2, a ferromagnetic element 3-5 and a mobile magnetic element 3-4.
= The hollow case 3-1 of the pen has a closed end, a narrow middle portion and an open conical end.
= The ink cartridge 3-2 of the pen has a top end, a fat portion and a writing tip. The ink cartridge 3-2 is slidably mounted inside the hollow case 3-1. The writing tip of the ink cartridge 3-2 is capable of penetrating through the open conical end of the hollow case 3-1.
= The mechanical spring 3-3 of the pen is concentrically mounted around the ink cartridge 3-2 between the narrow middle portion of the hollow case 3-1 and the fat portion of the ink cartridge 3-2.
= The ferromagnetic element 3-5 of the pen has a top end and portions defining a central hole. The ferromagnetic element 3-5 is securely attached to the top end of the ink cartridge 3-2.
= The mobile magnetic element 3-4 of the pen is magnetically attached to the top end of the ferromagnetic element 3-5. The mobile magnetic element 3-4 is detachable from the ferromagnetic element 3-5.
= The cap comprises a cap body 4-1 and a stationary permanent magnet 4-4 for providing a magnetic attraction force.
= The cap body 4-1 of the cap has a top end and a bottom end.
= The stationary permanent magnet 4-4 of the cap is securely attached to the bottom end of the cap body 4-1.
= The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element 3-4 of the pen in proximity to the stationary permanent magnet 4-4 of the cap.
= The writing tip of the ink cartridge 3-2 of the pen retracts into the hollow case 3-1 of the pen when an upward magnetic attraction force between the mobile magnetic element 3-4 of the pen and the stationary permanent magnet 4-4 of the cap becomes greater than a downward mechanical expansion force by the mechanical spring 3-3 of the pen.
= The downward mechanical expansion force by the mechanical spring 3-3 of the pen provides a cushion effect to the writing tip of the ink cartridge 3-2 of the pen.
= The ferromagnetic element 3-5 provides an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element 3-4 and the stationary permanent magnet 4-4.
= In another embodiment of the invention shown in Figure 3 in a detached extended position, an auto-retractable pen comprises a pen and a cap.
= The pen comprises a hollow case 3-1, an ink cartridge 3-2, a mechanical spring 3-3 for downwardly biasing the ink cartridge 3-2 and a mobile magnetic element 3-4.
= The hollow case 3-1 of the pen has a closed end, a narrow middle portion and an open conical end.
= The ink cartridge 3-2 of the pen has a top end, a fat portion and a writing tip. The ink cartridge 3-2 is slidably mounted inside the hollow case 3-1. The writing tip of the ink cartridge 3-2 is capable of penetrating through the open conical end of the hollow case 3-1.
= The mechanical spring 3-3 of the pen is concentrically mounted around the ink cartridge 3-2 between the narrow middle portion of the hollow case 3-1 and the fat portion of the ink cartridge 3-2.
= The mobile magnetic element 3-4 of the pen is securely attached to the top end of the ink cartridge 3-2.
= The cap comprises a cap body 4-1, a ferromagnetic element 4-5 and a stationary permanent magnet 4-4 for providing a magnetic attraction force.
= The cap body 4-1 of the cap has a top end and a bottom end.
= The ferromagnetic element 4-5 of the cap has a bottom end. The ferromagnetic element 4-5 is securely attached to the bottom end of the cap body 4-1.
= The stationary permanent magnet 4-4 of the cap is magnetically attached to the bottom end of the ferromagnetic element 4-5. The stationary permanent magnet 4-4 is detachable from the ferromagnetic element 4-5.
= The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element 3-4 of the pen in proximity to the stationary permanent magnet 4-4 of the cap.
= The writing tip of the ink cartridge 3-2 of the pen retracts into the hollow case 3-1 of the pen when an upward magnetic attraction force between the mobile magnetic element 3-4 of the pen and the stationary permanent magnet 4-4 of the cap becomes greater than a downward mechanical expansion force by the mechanical spring 3-3 of the pen.
= The downward mechanical expansion force by the mechanical spring 3-3 of the pen provides a cushion effect to the writing tip of the ink cartridge 3-2 of the pen.
= The ferromagnetic element 4-5 provides an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element 3-4 and the stationary permanent magnet 4-4.
= In another embodiment of the invention, an auto-retractable pen is shown in Figure 4 in a detached extended position and in Figure 5 in an attached retracted position.
= The ferromagnetic elements of the invention allows no-glue construction, in which the mobile magnetic element 3-4 is detachable from the ferromagnetic element 3-5, and the stationary permanent magnet 4-4 is detachable from the ferromagnetic element 4-5.
= The auto-retractable pen may further comprise a loop-shaped cord 4-2 securely attached to the top end of the cap body 4-1 of the cap.
= The hollow case 3-1 of the pen may be cylindrical.
= The mobile magnetic element 3-4 of the pen may be disc-shaped or ring-shaped.
= The mobile magnetic element 3-4 of the pen may be made of a rare-earth permanent magnet.
= The cap body 4-1 of the cap may be cylindrical.
= The stationary permanent magnet 4-4 of the cap may be disc-shaped or ring-shaped.
= The stationary permanent magnet 4-4 of the cap may be made of a rare-earth permanent magnet.
= The ink cartridge 3-2 of the pen may be a ball-point pen, or a gel-ink pen.
Background Art = There are many instances where it would be desirable to be able to provide a retractable pen with a mechanism to allow a user to magnetically attach a pen to a cap in a single-hand operation, and to simultaneously retract the writing tip.
= A number of patents disclose retractable pens.
= U.S. Patent 6 394 677 discloses "Hanging pen and cord thereof". This prior art pen has a pen cap, and a penholder. The pen cap has a blocking cover with a loop cord for carrying and an opening at the other end. The penholder provides a center stick therein with a writing head of the center stick extending outwardly from a conical part at an end of the penholder. A magnetic ring is fixed in the pen cap. The conical part is made of magnet inducing material. The pen cap engages the penholder by way of the magnetic ring attracting the conical part when the conical part is inserted into the pen cap from the open end.
= This prior art does not provide a retractable pen with a mechanism to allow a user to magnetically attach a pen to a cap in a single-hand operation. In addition, prior art retractable pens do not simultaneously retract the writing tip when the pen is attached to the cap. Moreover, prior art retractable pens do not provide a cushion effect to the writing tip.
= Canadian Application 2 429 153 discloses "Auto-Retractable Pen mechanism with a Cushion Effect". However, this prior art provides weak magnetic attachment between the pen and the cap. Moreover, this prior art does not provide no-glue construction.
Description of the Invention = It is a primary object of the invention to provide an auto-retractable pen in which a pen magnetically attaches to a cap in a single-hand operation by the user.
= It is another object of the invention to provide an auto-retractable pen which simultaneously retracts the writing tip when the pen is attached to the cap.
= It is another object of the invention to provide an auto-retractable pen in which the pen stays upside up and downside down when attached to the cap.
= It is another object of the invention to provide an auto-retractable pen which has a cushion effect.
= It is another object of the invention to provide an auto-retractable pen which has a loop-shaped cord to be worn by the user around his/her neck.
= It is another object of the invention to provide an auto-retractable pen which has ferromagnetic elements in order to enhance the magnetic attachment between the pen and the cap.
= It is another object of the invention to provide an auto-retractable pen which has ferromagnetic elements in order to enable no-glue construction so that the polarity of the magnets (N, S) can be reversed after the construction.
= An auto-retractable pen comprises a pen and a cap. The pen comprises a hollow case, an ink cartridge, a mechanical spring and a mobile magnetic element. The cap comprises a cap body and a stationary permanent magnet.
The pen or the cap comprises a ferromagnetic element. The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap. The writing tip of the pen retracts into the hollow case of the pen when an upward magnetic attraction force becomes greater than a downward mechanical expansion force. The ferromagnetic element provides an increase in strength of the magnetic attachment force by concentrating magnetic flux lines.
Brief Description of the Figures in the Drawings = In drawings which illustrate embodiments of the invention:
o Figure 1 marked "Prior Art" is a sectional view of a conventional auto-retractable wearable pen in a detached position;
o Figure 2 is a sectional view of one embodiment of an auto-retractable wearable pen in a detached position according to the invention;
o Figure 3 is a sectional view of another embodiment of an auto-retractable wearable pen in a detached position according to the invention;
o Figure 4 is a sectional view of another embodiment of an auto-retractable wearable pen in a detached position according to the invention; and o Figure 5 is a sectional view of the invention of Figure 4 in an attached position.
Modes for Carrying Out the Invention = A conventional auto-retractable wearable pen shown in Figure 1 marked "Prior Art" in a detached extended position comprises a pen and a cap.
= The pen comprises a hollow case 1-1, an ink cartridge 1-2, a mechanical spring 1-3 for downwardly biasing the ink cartridge 1-2, and a mobile magnetic element 1-4.
= The hollow case 1-1 of the pen has a closed end, a narrow middle portion and an open conical end.
= The ink cartridge 1-2 of the pen has a top end, a fat portion and a writing tip. The ink cartridge 1-2 is slidably mounted inside the hollow case 1-1. The writing tip of the ink cartridge 1-2 is capable of penetrating through the open conical end of the hollow case 1-1.
= The mechanical spring 1-3 of the pen is concentrically mounted around the ink cartridge 1-2 between the narrow middle portion of the hollow case 1-1 and the fat portion of the ink cartridge 1-2.
= The mobile magnetic element 1-4 of the pen is securely attached to the top end of the ink cartridge 1-2.
= The cap comprises a cap body 2-1 and a stationary permanent magnet 2-2 for providing a magnetic attraction force.
= The cap body 2-1 of the cap has a top end and a bottom end.
= The stationary permanent magnet 2-4 of the cap is securely attached to the bottom end of the cap body 2-1.
= The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element 1-4 of the pen in proximity to the stationary permanent magnet 2-4 of the cap. The writing tip of the ink cartridge 1-2 of the pen retracts into the hollow case 1-1 of the pen when an upward magnetic attraction force between the mobile magnetic element 1-4 of the pen and the stationary permanent magnet 2-4 of the cap becomes greater than a downward mechanical expansion force by the mechanical spring 1-3 of the pen.
= The downward mechanical expansion force by the mechanical spring 1-3 of the pen provides a cushion effect to the writing tip of the ink cartridge 1-2 of the pen.
= This prior art requires glue to securely attach the mobile magnetic element 1-4 of the pen to the top end of the ink cartridge 1-2, and also the stationary permanent magnet 2-4 of the cap to the bottom end of the cap body 2-1. These connections are permanent, so the mobile magnetic element 1-4 and the stationary permanent magnet 2-4 are not detachable.
= In one embodiment of the invention shown in Figure 2 in a detached extended position, an auto-retractable pen comprises a pen and a cap.
= The pen comprises a hollow case 3-1, an ink cartridge 3-2, a mechanical spring 3-3 for downwardly biasing the ink cartridge 3-2, a ferromagnetic element 3-5 and a mobile magnetic element 3-4.
= The hollow case 3-1 of the pen has a closed end, a narrow middle portion and an open conical end.
= The ink cartridge 3-2 of the pen has a top end, a fat portion and a writing tip. The ink cartridge 3-2 is slidably mounted inside the hollow case 3-1. The writing tip of the ink cartridge 3-2 is capable of penetrating through the open conical end of the hollow case 3-1.
= The mechanical spring 3-3 of the pen is concentrically mounted around the ink cartridge 3-2 between the narrow middle portion of the hollow case 3-1 and the fat portion of the ink cartridge 3-2.
= The ferromagnetic element 3-5 of the pen has a top end and portions defining a central hole. The ferromagnetic element 3-5 is securely attached to the top end of the ink cartridge 3-2.
= The mobile magnetic element 3-4 of the pen is magnetically attached to the top end of the ferromagnetic element 3-5. The mobile magnetic element 3-4 is detachable from the ferromagnetic element 3-5.
= The cap comprises a cap body 4-1 and a stationary permanent magnet 4-4 for providing a magnetic attraction force.
= The cap body 4-1 of the cap has a top end and a bottom end.
= The stationary permanent magnet 4-4 of the cap is securely attached to the bottom end of the cap body 4-1.
= The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element 3-4 of the pen in proximity to the stationary permanent magnet 4-4 of the cap.
= The writing tip of the ink cartridge 3-2 of the pen retracts into the hollow case 3-1 of the pen when an upward magnetic attraction force between the mobile magnetic element 3-4 of the pen and the stationary permanent magnet 4-4 of the cap becomes greater than a downward mechanical expansion force by the mechanical spring 3-3 of the pen.
= The downward mechanical expansion force by the mechanical spring 3-3 of the pen provides a cushion effect to the writing tip of the ink cartridge 3-2 of the pen.
= The ferromagnetic element 3-5 provides an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element 3-4 and the stationary permanent magnet 4-4.
= In another embodiment of the invention shown in Figure 3 in a detached extended position, an auto-retractable pen comprises a pen and a cap.
= The pen comprises a hollow case 3-1, an ink cartridge 3-2, a mechanical spring 3-3 for downwardly biasing the ink cartridge 3-2 and a mobile magnetic element 3-4.
= The hollow case 3-1 of the pen has a closed end, a narrow middle portion and an open conical end.
= The ink cartridge 3-2 of the pen has a top end, a fat portion and a writing tip. The ink cartridge 3-2 is slidably mounted inside the hollow case 3-1. The writing tip of the ink cartridge 3-2 is capable of penetrating through the open conical end of the hollow case 3-1.
= The mechanical spring 3-3 of the pen is concentrically mounted around the ink cartridge 3-2 between the narrow middle portion of the hollow case 3-1 and the fat portion of the ink cartridge 3-2.
= The mobile magnetic element 3-4 of the pen is securely attached to the top end of the ink cartridge 3-2.
= The cap comprises a cap body 4-1, a ferromagnetic element 4-5 and a stationary permanent magnet 4-4 for providing a magnetic attraction force.
= The cap body 4-1 of the cap has a top end and a bottom end.
= The ferromagnetic element 4-5 of the cap has a bottom end. The ferromagnetic element 4-5 is securely attached to the bottom end of the cap body 4-1.
= The stationary permanent magnet 4-4 of the cap is magnetically attached to the bottom end of the ferromagnetic element 4-5. The stationary permanent magnet 4-4 is detachable from the ferromagnetic element 4-5.
= The pen is capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element 3-4 of the pen in proximity to the stationary permanent magnet 4-4 of the cap.
= The writing tip of the ink cartridge 3-2 of the pen retracts into the hollow case 3-1 of the pen when an upward magnetic attraction force between the mobile magnetic element 3-4 of the pen and the stationary permanent magnet 4-4 of the cap becomes greater than a downward mechanical expansion force by the mechanical spring 3-3 of the pen.
= The downward mechanical expansion force by the mechanical spring 3-3 of the pen provides a cushion effect to the writing tip of the ink cartridge 3-2 of the pen.
= The ferromagnetic element 4-5 provides an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element 3-4 and the stationary permanent magnet 4-4.
= In another embodiment of the invention, an auto-retractable pen is shown in Figure 4 in a detached extended position and in Figure 5 in an attached retracted position.
= The ferromagnetic elements of the invention allows no-glue construction, in which the mobile magnetic element 3-4 is detachable from the ferromagnetic element 3-5, and the stationary permanent magnet 4-4 is detachable from the ferromagnetic element 4-5.
= The auto-retractable pen may further comprise a loop-shaped cord 4-2 securely attached to the top end of the cap body 4-1 of the cap.
= The hollow case 3-1 of the pen may be cylindrical.
= The mobile magnetic element 3-4 of the pen may be disc-shaped or ring-shaped.
= The mobile magnetic element 3-4 of the pen may be made of a rare-earth permanent magnet.
= The cap body 4-1 of the cap may be cylindrical.
= The stationary permanent magnet 4-4 of the cap may be disc-shaped or ring-shaped.
= The stationary permanent magnet 4-4 of the cap may be made of a rare-earth permanent magnet.
= The ink cartridge 3-2 of the pen may be a ball-point pen, or a gel-ink pen.
Claims (11)
1. An auto-retractable pen comprising:
.smallcircle. a pen comprising:
~ a hollow case having a closed end, a narrow middle portion and an open conical end, the hollow case having a cylindrical shape;
~ an ink cartridge having a top end, a fat portion and a writing tip, the ink cartridge slidably mounted inside the hollow case, the writing tip of the ink cartridge being capable of penetrating through the open conical end of the hollow case;
~ a mechanical spring for downwardly biasing the ink cartridge, the mechanical spring concentrically mounted around the ink cartridge between the narrow middle portion of the hollow case and the fat portion of the ink cartridge;
~ a ferromagnetic element having a top end and portions defining a central hole, the ferromagnetic element securely attached to the top end of the ink cartridge; and ~ a mobile magnetic element magnetically attached to the top end of the ferromagnetic element, the mobile magnetic element detachable from the ferromagnetic element; and .smallcircle. a cap comprising:
~ a cap body having a top end and a bottom end;
~ a stationary permanent magnet for providing a magnetic attraction force, the stationary permanent magnet securely attached to the bottom end of the cap body; and ~ a loop-shaped cord securely attached to the top end of the cap body;
the pen being capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap, the writing tip of the ink cartridge of the pen retracting into the hollow case of the pen when an upward magnetic attraction force between the mobile magnetic element of the pen and the stationary permanent magnet of the cap becomes greater than a downward mechanical expansion force by the mechanical spring of the pen, the downward mechanical expansion force by the mechanical spring of the pen providing a cushion effect to the writing tip of the ink cartridge of the pen, the ferromagnetic element providing an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element and the stationary permanent magnet, the ferromagnetic element being made of steel having a thickness of 1.0 mm or greater, the magnetic attachment between the ferromagnetic element and the permanent magnet providing a no-glue construction.
.smallcircle. a pen comprising:
~ a hollow case having a closed end, a narrow middle portion and an open conical end, the hollow case having a cylindrical shape;
~ an ink cartridge having a top end, a fat portion and a writing tip, the ink cartridge slidably mounted inside the hollow case, the writing tip of the ink cartridge being capable of penetrating through the open conical end of the hollow case;
~ a mechanical spring for downwardly biasing the ink cartridge, the mechanical spring concentrically mounted around the ink cartridge between the narrow middle portion of the hollow case and the fat portion of the ink cartridge;
~ a ferromagnetic element having a top end and portions defining a central hole, the ferromagnetic element securely attached to the top end of the ink cartridge; and ~ a mobile magnetic element magnetically attached to the top end of the ferromagnetic element, the mobile magnetic element detachable from the ferromagnetic element; and .smallcircle. a cap comprising:
~ a cap body having a top end and a bottom end;
~ a stationary permanent magnet for providing a magnetic attraction force, the stationary permanent magnet securely attached to the bottom end of the cap body; and ~ a loop-shaped cord securely attached to the top end of the cap body;
the pen being capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap, the writing tip of the ink cartridge of the pen retracting into the hollow case of the pen when an upward magnetic attraction force between the mobile magnetic element of the pen and the stationary permanent magnet of the cap becomes greater than a downward mechanical expansion force by the mechanical spring of the pen, the downward mechanical expansion force by the mechanical spring of the pen providing a cushion effect to the writing tip of the ink cartridge of the pen, the ferromagnetic element providing an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element and the stationary permanent magnet, the ferromagnetic element being made of steel having a thickness of 1.0 mm or greater, the magnetic attachment between the ferromagnetic element and the permanent magnet providing a no-glue construction.
2. An auto-retractable pen comprising:
.smallcircle.a pen comprising:
~ a hollow case having a closed end, a narrow middle portion and an open conical end;
~ an ink cartridge having a top end, a fat portion and a writing tip, the ink cartridge slidably mounted inside the hollow case, the writing tip of the ink cartridge being capable of penetrating through the open conical end of the hollow case;
~ a mechanical spring for downwardly biasing the ink cartridge, the mechanical spring concentrically mounted around the ink cartridge between the narrow middle portion of the hollow case and the fat portion of the ink cartridge; and ~ a mobile magnetic element securely attached to the top end of the ink cartridge; and .smallcircle. a cap comprising:
~ a cap body having a top end and a bottom end;
~ a ferromagnetic element having a bottom end, the ferromagnetic element securely attached to the bottom end of the cap body;
~a stationary permanent magnet for providing a magnetic attraction force, the stationary permanent magnet magnetically attached to the bottom end of the ferromagnetic element, the stationary permanent magnet detachable from the ferromagnetic element; and ~ a loop-shaped cord securely attached to the top end of the cap body;
the pen being capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap, the writing tip of the ink cartridge of the pen retracting into the hollow case of the pen when an upward pen and the stationary permanent magnet of th cap becomes greater than a downward mechanical expansion force by the mechanical spring of the pen providing a cushion effect tot he writing tip of the ink cartridge of the pen, the ferromagnetic element providing an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element and the stationary permanent magnet, the ferromagnetic element being made of steel having a thickness of 1.0 mm or greater, the magnetic attachment between the ferromagnetic element and the permanent magnet providing a no-glue construction.
.smallcircle.a pen comprising:
~ a hollow case having a closed end, a narrow middle portion and an open conical end;
~ an ink cartridge having a top end, a fat portion and a writing tip, the ink cartridge slidably mounted inside the hollow case, the writing tip of the ink cartridge being capable of penetrating through the open conical end of the hollow case;
~ a mechanical spring for downwardly biasing the ink cartridge, the mechanical spring concentrically mounted around the ink cartridge between the narrow middle portion of the hollow case and the fat portion of the ink cartridge; and ~ a mobile magnetic element securely attached to the top end of the ink cartridge; and .smallcircle. a cap comprising:
~ a cap body having a top end and a bottom end;
~ a ferromagnetic element having a bottom end, the ferromagnetic element securely attached to the bottom end of the cap body;
~a stationary permanent magnet for providing a magnetic attraction force, the stationary permanent magnet magnetically attached to the bottom end of the ferromagnetic element, the stationary permanent magnet detachable from the ferromagnetic element; and ~ a loop-shaped cord securely attached to the top end of the cap body;
the pen being capable of attaching to the cap by the magnetic attraction force in a single-hand operation when a user places the mobile magnetic element of the pen in proximity to the stationary permanent magnet of the cap, the writing tip of the ink cartridge of the pen retracting into the hollow case of the pen when an upward pen and the stationary permanent magnet of th cap becomes greater than a downward mechanical expansion force by the mechanical spring of the pen providing a cushion effect tot he writing tip of the ink cartridge of the pen, the ferromagnetic element providing an increase in strength of the magnetic attachment force between the pen and the cap by concentrating magnetic flux lines between the mobile magnetic element and the stationary permanent magnet, the ferromagnetic element being made of steel having a thickness of 1.0 mm or greater, the magnetic attachment between the ferromagnetic element and the permanent magnet providing a no-glue construction.
3. The auto-retractable pen as defined in claim 1 or claim 2, in which the mobile magnetic element of the pen is disc-shaped.
4. The auto-retractable pen as defined in claim 1 or claim 2, in which the mobile magnetic element of the pen is ring-shaped.
5. The auto-retractable pen as defined in claim 1 or claim 2, in which the mobile magnetic element of the pen is made of a rare-earth permanent magnet.
6. The auto-retractable pen as defined in claim 1 or claim 2, in which the cap body of the cap is cylindrical.
7. The auto-retractable pen as defined in claim 1 or claim 2, in which the stationary permanent magnet of the cap is disc-shaped.
8. The auto-retractable pen as defined in claim 1 or claim 2, in which the stationary permanent magnet of the cap is ring-shaped.
9. The auto-retractable pen as defined in claim 1 or claim 2, in which the stationary permanent magnet of the cap is made of a rare-earth permanent magnet.
10. The auto-retractable pen as defined in claim 1 or claim 2, in which the ink cartridge of the pen is a ball-point pen.
11. The auto-retractable pen as defined in claim 1 or claim 2, in which the ink cartridge of the pen is a gel-ink pen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2499834 CA2499834C (en) | 2005-03-18 | 2005-03-18 | Auto-retractable pen with ferromagnetic attachment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2499834 CA2499834C (en) | 2005-03-18 | 2005-03-18 | Auto-retractable pen with ferromagnetic attachment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2499834A1 CA2499834A1 (en) | 2006-09-18 |
| CA2499834C true CA2499834C (en) | 2011-09-20 |
Family
ID=37054247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2499834 Expired - Fee Related CA2499834C (en) | 2005-03-18 | 2005-03-18 | Auto-retractable pen with ferromagnetic attachment |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2499834C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2467775A (en) * | 2009-02-13 | 2010-08-18 | Richard Colin Thomas Allan | Writing instrument |
| FR2945766A1 (en) * | 2009-05-19 | 2010-11-26 | Bic Soc | MAGNETIC REPULSION WRITING INSTRUMENT |
| CN108602376B (en) * | 2016-01-08 | 2020-08-28 | 斯克里贝技术咨询有限责任公司 | Writing instrument with magnetic feature and quick fill capability |
| CZ307915B6 (en) * | 2018-10-12 | 2019-07-31 | Michal Klaška | Fountain pen |
-
2005
- 2005-03-18 CA CA 2499834 patent/CA2499834C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2499834A1 (en) | 2006-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140318 |