IMPROVEMENT ON OFFSET PEN STRUCTURE

Abstract: An offset pen has a holding portion (51) and a writing portion (53) interconnected by an intermediate portion (52) such that the holding portion and writing portion have different axes with a vacancy therebetween. The vacancy provides a line of sight on either side of the writing tip (532) during use of the pen.

Description: IMPROVEMENT ON OFFSET PEN STRUCTURE FIELD OF THE INVENTION The present invention is related to an offset pen. and more particularly to an improved offset pen structure for comfortable holding, enhanced functions, and easy making BACKGROUND OF THE INVENTION So far. conventional writing tools such as fountain pen, pencil, ball point pen. coloring pencil and writing brash on the market are all linear in shape That is. a writing head and a holding stick of a writing tool are substantially coaxial Owing to the limit of people's palm structure, the writing tool generally tilts rearward the wrist while being used so that the vision line of the user will be obstructed by the writing tip of the writing tool As such, there are several defects in writing or drawing with the conventional writing tool First of all. a user cannot clearly see the space behind the writing tool along the vision line, so it is difficult for the user to wπte straight or draw in position Especially for kids, they are likely to change their sitting posture, e g he their heads upon the desks, while writing in an attempt to bypass the blockage of the vision line by the writing tool, and it is harmful to kids " eyesight and bone In addition, people are used to holding the writing tool slantwise, so the linear shape of the writing tool results in the slant of the writing portion relative to the working surface, and as such, the user gets no right point to exercise the pressing point and has to exert more stress on the working surface while vvπting or drawing The inevitable fatigue would rain children ' s interests in writing Furthermore, the slant of the writing portion relative to the working surface makes the drawing operations with an assistant tool such as a raler unable to achieve the best effect, since the writing tip will not be in close contact with the side surface of the raler The present inventor found that the above problems can be solved by providing an offset pen which includes an intermediate portion between a holding portion, 1 e the pen stick, and a writing portion. 1 e the wπting head, to make the holding portion and the writing portion positioned in different axes For example, Figs 1A and IB schematically show how is an offset pen used to solve the above problems Please refer to Fig 1 A. an offset pen includes a holding portion A. an intermediate portion B and a writing portion C Owing to the presence of the crooked intermediate portion B, the axis of the writing portion C and that of the holding portion A will intersect at a certain angle so as to adjust the angle between the writing portion C and the working surface to approximately 90 degree As such, the vision line of the user will not be obstructed by the wπting tool as by the front portion PI of a conventional pen Accordingly, the wπting operation of the user will proceed relatively smoothly Furthermore, the crooked inteπnediate portion B provides a structure suitable foi user ' s fingers to exert force on so as to lessen the load of user ' s fingers Please refer now to Fig IB in which an offset pen is used together with a raler R By using an offset pen including a holding portion A, an inteπnediate portion B and a writing portion C as mentioned above, the writing portion C is approximately perpendicular to the working surface K so as to be in close contact with the side surface R2 of the raler R As such, the user will be able to draw a line precisely as desired without being influenced by his palm stπicture and the thickness of the raler So far. several kinds of offset or shaped pens have been developed in spite they are provided for solving problems other than the above ones US Patent No 655.731 issued to Pierce in 1900 discloses an offset fountain pen, in which a laterally extended short tube has one end thereof connected to the handle and the other end thereof connected to the writing head to buffer the ink discharged from the reservoir in the handle to the writing head to avoid blots and soiling of the fingers The Pierce ' s design is focused on the selection of the cross-sectional areas of the ink passages of the pen in order to achieve the above purposes, and there is no special design for improving the holding feeling and stability and other details while using the offset pen US Patent No 5,527, 124 issued to Kolaπc in 1996 discloses a shaped pen. and more particularly a ball-point pen, which is shaped in the lower section of the pen housing in order to position the writing tip at a steeper than usual angle to the surface of the paper to maximize the free flow of ink onto paper while still allowing the user to maintain a comfortable grip upon the pen However, the Kolaπc ' s design is focused on the selection of the lengths and the angles of sections of the pen in order to achieve the above purposes, and there is no special design for improving the holding feeling and stability and other details while using the shaped pen On the other hand, according to the holding manner of the shaped pen suggested in the Kolaπc ' s patent, as shown in Fig 3, the vision line of the user, although not obstracted by the writing tool, is blocked by the user ' s fingers US Patent No 849.513 issued to Sturm in 1907 discloses an offset pen which includes a gripping section G in the intermediate portion and writing head area, as shown in Fig 4 The gripping section also obstracts the user ' s vision hne while writing or drawing On the other hand, theie is no reference so far disclosing the manufacturing of the offset pen In fact, it is difficult to manufacture the housing of an offset pen integrally like injection molding the conventional linear pen because a crooked passage extending through the wπting portion, the inteπnediate portion and the holding portion may be required for accommodating an ink reservoir or refill Furtheπnore. there is no offset pen designed for replaceable pencil which is a kind of pencil consisted of a plurality of replaceable pencil heads of a short iod shape The hollow passages of the above-mentioned conventional offset pens for accommodating ink reservoπs are all crooked so as not to be suitable for storing a series of replaceable pencil heads SUMMARY OF THE INVENTION Therefore, an objective of the present invention is to provide an offset pen having a vacancy beneath the lnteπnediate portion so that the user ' s vision line can be extended to both sides of the wπting head through the vacancy while writing or drawing Another objective of the present invention is to provide an offset pen which includes a pen cap which has a specially designed cap clip to allow the nonlinear offset pen to be secured onto a holding piece, e g a pocket of a shirt, uprightly A further objective of the piesent invention is to provide an offset pen in which the intermediate portion is designed to make the holding and writing operations of the offset pen smooth and comfortable A yet objective of the present invention is to provide an offset pen which includes an illuminating device on the inteπnediate portion so that the offset pen can be used in a relatively dark environment. Still an objective of the present invention is to provide an offset pen which can be easily made by combining pieces separately manufactured. Still another objective of the present invention is to provide an offset pen which is especially suitable for using replaceable writing tips, e.g. replaceable pencil heads. Basically, an offset pen according to the present invention includes a holding portion to be supported by a user's writing hand; a writing portion to be mounted thereon a writing tip to leave marks on a working surface; and an intermediate portion substantially connected between one end of the holding portion and one end of the writing portion to make the holding portion and the writing portion positioned in different axes, and create a vacancy between the writing portion and the holding portion. In addition, according to the first aspect of the present invention, the intermediate portion of the offset pen has two concavities on two sides thereof, respectively, optionally provided for two fingers of the user's writing hand to rest thereon so as to facilitate the holding and writing operations. For example, while writing, the holding portion is supported between the thumb and the index finger of the user ' s writing hand, and tips of the thumb and the index finger of the user ' s writing hand rest on the two concavities. Preferably, the intermediate portion has an upper surface optionally provided for the tip of the index finger of the user ' s writing hand to press against to further facilitate the holding and writing operations while writing. As for the shape of the upper surface, it can be plane, concave or convex, as long as it is comfortable for the pressing finger. In order to accommodate the writing tip. e.g. the tip of a ball point pen, and a writing material supply coπesponding to the writing tip, e g an ink refill, a hollow passage extending through the wπting portion, the inteπnediate portion and the holding portion is aπanged within the offset pen In this case, it is preferred that a lower part of the inteπnediate portion is larger than an upper part thereof in cross-sectional area so that the hollow passage penetrates through the inteπnediate portion smoothly Preferably, the intermediate portion includes a soft pad at the lower part, and the middle finger of the user ' s writing hand optionally sustains against the soft pad while writing to feel comfortable According to a second aspect of the present invention, the offset pen further includes an illuminating device in addition to the essential writing portion, holding portion and inteπnediate portion mentioned above The illuminating device is mounted to the inteπnediate portion to lighten an area near the writing tip In an embodiment, the illuminating device is mounted on a lower part of the inteπnediate portion and located within the vacancy between the wπting portion and the holding portion If the inteπnediate portion is transparent, the illuminating device can be mounted inside the inteπnediate portion If not, the illuminating device can also be mounted inside the intermediate portion at a lower part near a connection position between the intermediate portion and the holding portion In this case, however, an opening should be arranged at the lower part beneath the illuminating device to allow light to be transmitted out of the inteπnediate portion to reach the area near the writing tip Preferably, the writing tip is substantially located in an extension line of the holding portion so that light emitted from the illuminating device can be centered on the writing tip Alternatively, if the writing portion is transparent, the illuminating device can be mounted inside the intermediate portion at a position near the connection between the inteπnediate portion and the writing portion In another embodiment, the illuminating device is mounted on a front surface of the inteπnediate portion In a further embodiment, the intermediate portion includes a detachable soft pad at the lower part, and the illuminating device can be attached on the soft pad Preferably, the illuminating device is a point light source such as a light bulb A battery for supplying power for the illuminating device can be installed in the holding portion According to a third aspect of the present invention, the offset pen f rther includes a pen cap in addition to the essential writing portion, holding portion and inteπnediate portion mentioned above The pen cap includes a hollow tube for receiving the writing portion therein to avoid blotting of the writing tip when the offset pen is not in use, and a clip strip attached onto the hollow tube, and having an angle with the hollow tube to become axially parallel to the holding portion when the hollow tube caps the writing portion so as to cooperate with the holding portion to allow the offset pen to clamp a holding piece Preferably, the hollow tube can cap an end part of the holding portion when the offset pen is in use, and the clip strip is pivotally attached onto the hollow tube By this way, the clip strip can be pivotally rotated to have the angle with the hollow tube to become axially parallel to the holding portion when the hollow tube caps the writing portion, and pivotally rotated to become axially parallel to the hollow tube when the hollow tube caps the end part of the holding portion According to a fourth aspect of the present invention, the offset pen having the essential wπting portion, holding portion and inteπnediate portion mentioned above is characterized in that the intermediate portion is foπned by combining at least two separate pieces In an embodiment, the offset pen is foπned by combining two separately integrally foπned pieces, wherein a first piece foπns a part of the writing portion, the inteπnediate portion and the holding portion, and a second piece foπns the other part of the writing portion, the inteπnediate portion and the holding portion The first and the second pieces can be combined by tooth engagement Alternatively, the offset pen is foπned by combining two separately integrally foπned pieces, wherein a first piece forms a part of the inteπnediate portion and the holding portion, and a second piece foπns the writing portion, and the other part of the inteπnediate portion and the holding portion The first and the second pieces can be combined by pivotally connecting the first piece to the second piece In another embodiment, the offset pen is formed by combining three separately integrally formed pieces, wherein a first piece forms a part of the intermediate portion, a second piece foπns the writing portion and the other part of the intermediate portion, and a third piece forms a holding portion, and screwing the combined inteπnediate portion and writing portion to the holding portion Preferably, the first piece foπns a side or rear surface of the inteπnediate portion When the first piece foπns a rear surface of the intermediate portion, the first piece is preferably a soft pad allowing the middle fingei of the user ' s wπting hand to sustain thereagamst while writing to feel comfortable In a further embodiment, the offset pen is formed bv combining several separately integrally foπned pieces, wherein a first piece foπns a part of the inteπnediate portion, a second piece foπns another part of the inteπnediate portion, and a third piece foπns the writing portion and the other part of the inteπnediate portion, and screwing the combined intermediate portion and writing portion to the holding portion Preferably, the first and the second pieces foπn two opposite side surfaces of the inteπnediate portion, respectively In a still further embodiment, the offset pen is foπned by combining two separately integrally formed pieces, wherein a first piece foπns the holding portion and a part of the inteπnediate portion, and a second piece foπns the other part of the inteπnediate portion and the writing portion The first piece and the second piece are combined by tooth engagement Alternatively, the offset pen is formed by combining three separately integrally foπned pieces, wherein a first piece fonns a part of the inteπnediate portion, a second piece foπns the other part of the inteπnediate portion and the writing portion, and a three piece foπns the holding portion The combined writing portion and the inteπnediate portion is connected to the holding portion by screwing Preferably, the first piece and the second piece are combined by tooth engagement In a further embodiment, the offset pen is formed by combining two separatelv integrally foimed pieces, wherein a first piece forms the holding portion and the intermediate portion, and a second piece forms the writing portion Preferably, the first piece and the second piece are combined by tooth engagement According to a fifth aspect of the present invention, in addition to the essential writing portion, holding portion and inteπnediate portion mentioned above, the offset pen further includes a writing tip retractmg mean for selectively retracting the writing tip into the writing portion The writing tip retracting mean includes a button mounted in the top end of the holding portion and having a hollow tube for receiving the top end of an ink refill so as to allow the ink refill to be selectively pushed down with lespect to the holding portion in response to the operation of a user In addition, there is a spring installed around the ink refill and having a first end urging against a fixing element of the ink refill and a second end urging against an inner surface of the offset pen so as to foπn an elastic force to the ink refill in response to the movement of the ink refill Preferably, the second end of the spring is a resilient rod urging against a low part of the intermediate portion Accordingly, the writing tip of the ink refill is extended out of the writing portion when the button is depressed, and the writing tip of the ink refill is drawn into the writing portion when the button is released Preferably, the offset pen further includes a clip strip attached to the holding portion thereof to allow the offset pen to clamp a holding piece According to a sixth aspect of the piesent invention, in addition to the essential writing portion, holding portion and intermediate portion mentioned above, the offset pen is further aπanged therein a linear hollow passage having both ends thereof open into the air, and axially extending through the holding portion and the inteπnediate portion for accommodating therein a series of replaceable writing tips In an embodiment, each of the writing tip and the replaceable writing tips is of a pencil-type writing material of a short rod shape, and includes a tapered writing part and a cylindrical base part In another embodiment, each of the writing tip and the replaceable writing tips is of a short rod shape, and includes a head part of a pencil- type writing material, a middle part having a first well securing thereto the head part, and a tail part connected to the middle part and having a second well for allowing the head part of another writing tip to be received therein Preferably, a stopper stracture is arranged at the opening of the second wall for stopping the middle part of the another writing tip when the head part of the another writing tip is inserted to be received in the second well By this way, it can prevent the tip of the head part from sustaining against the bottom of the middle part of a last writing tip so as to prevent from the damage of the head part Generally, the series of replaceable writing tips aligns itself by head- to-tail connection The head part and the tail part can be oriented to the intermediate portion and the holding portion, respectively, in the hollow passage Alternatively, the head part and the tail part can be oriented to the holding portion and the inteπnediate portion, respectively, in the hollow passage In this case, it is feasible to have one head part of the series of replaceable writing tips in the hollow passage protrade from the holding portion for providing an alternate writing tip to leave marks on the working surface According to a seventh aspect of the present invention, the offset pen having the essential writing portion, holding portion and inteπnediate portion mentioned above is characterized in that the writing tip is connected to an ink-soaking refill by a connector In an embodiment, the ink-soaking refill is arranged within a hollow passage of the holding portion for storing and supplying ink The connector is aπanged within the intermediate portion and substantially connected between one end of the ink-soaking refill and one end of the writing tip so as to allow the writing tip to obtain the ink from the lnk- soaking refill Certainly, in another embodiment, the connector can be integrally foπned to the wπting tip oi integrally foπned to the ink-soaking refill Accordingly, the ink-soaking refill is made of hquid-adsorptive material, and the connector is made of a hqmd-adsorptive material, too Alternatively, the connector is an introducing tube made of a metal material for introducing the ink from the ink-soakmg refill to the wπting tip Preferably, the writing tip is a brash-type writing tip In addition, the offset pen further includes an upper cap detachably engaging with an opening of the holding portion BRIEF DESCRIPTION OF THE DRAWING The present invention may best be understood through the following description with reference to the accompanying drawings, in which Fig 1A schematically shows the use of an offset pen compared to the use of a linear pen. Fig IB schematically shows the use of an offset pen together with a raler, Fig 2 schematically shows an offset pen disclosed in US Patent No 655,731 , Fig 3 schematically shows the use of an offset pen disclosed in US Patent No 5,527, 124, Fig 4 schematically shows an offset pen disclosed in US Patent No 849,513, Fig 5 is a side view of an offset pen for schematically showing the basic stracture of the offset pen of the present invention. Fig. 6 is a top view of an intermediate portion of an offset pen having the basic structure of Fig. 5 wherein the inteπnediate portion has two concavities on both sides thereof, Fig. 7A is a side view of an inteπnediate portion of an offset pen having the stracture of Fig. 6 for schematically showing a modification of the offset pen of Fig. 6, Figs. 7B-7D are partial front views of offset pens for schematically showing three examples of the inteπnediate portion of Fig. 7A, respectively; Fig. 8 is a cross-sectional view of an offset pen for schematically showing another modification of the offset pen of Fig. 6, Fig. 9 is a cross-sectional view of a first prefeπed embodiment of an offset pen having the basic stracture of Fig. 5 and including an illuminating device according to the present invention; Fig. 10 is a side view of a second prefeπed embodiment of an offset pen having the basic stracture of Fig. 5 and including an illuminating device according to the present invention; Fig. 1 1 is a side view of a third prefeπed embodiment of an offset pen having the basic stracture of Fig. 5 and including an illuminating device according to the present invention. Fig. 12 is a cross-sectional view of a fourth preferred embodiment of an offset pen having the basic stracture of Fig. 5 and including an illuminating device according to the present invention, Fig. 1 is a front view of a fifth preferred embodiment of an offset pen having the basic stracture of Fig. 5 and including an illuminating device according to the present invention, Fig. 14A is a partial side view of a sixth prefeπed embodiment of an offset pen having the basic stracture of Fig 5 and including an illuminating device according to the present invention. Fig 14B is a cross-sectional view schematically showing the illuminating device mounted on the soft pad of the offset pen of Fig 14A Figs 15A and 15B are side views of a first preferred embodiment of an offset pen having the basic stracture of Fig 5 and including a pen cap according to the present invention, in which the pen cap is capped on the writing portion and the holding portion, respectively, Figs 16 A and 16B are side views of a second prefeπed embodiment of an offset pen having the basic stracture of Fig 5 and including a pen cap according to the present invention, in which the pen cap is capped on the wπting portion and the holding portion, respectively, Fig 17 is a resolved diagram of a first prefeπed embodiment of an offset pen having the basic stracture of Fig 5 and combined by two pieces. Fig 18 schematically shows a combining manner of the two pieces of the offset pen of Fig 17, Fig 19 schematically shows a combining manner of the two pieces of a second preferred embodiment of an offset pen according to the present invention having the basic stracture of Fig 5 and combined by two pieces, Fig 20 schematically shows a combining manner of the two pieces of a third preferred embodiment of an offset pen according to the present invention having the basic stracture of Fig 5 and combined by two pieces, Fig 21 is a partially resolved diagram of a fourth prefeπed embodiment of an offset pen having the basic stracture of Fig 5 and having the inteπnediate portion combined by two pieces. Fig 22 schematically shows a combining manner of the two pieces of a fifth prefeπed embodiment of an offset pen according to the present invention having the basic stracture of Fig 5 and having the inteπnediate portion combined by two pieces. Fig 23 is a perspective view of a first piece of the inteπnediate portion of a sixth prefeπed embodiment of an offset pen according to the present invention having the basic stracture of Fig 5 and having the inteπnediate portion combined by two pieces, Fig 24 schematically shows a combining manner of the three pieces of a seventh preferred embodiment of an offset pen according to the present invention having the basic stracture of Fig 5 and having the inteπnediate portion combined by three pieces. Fig 25A is a partial resolved diagram of an eighth preferred embodiment of an offset pen having the basic stracture of Fig 5 and combined by two pieces, Fig 25B schematically shows a combining manner of the two pieces of the offset pen of Fig 25A, Fig 25C schematically shows a combining manner of the two pieces of a ninth preferred embodiment of an offset pen according to the present invention having the basic stracture of Fig 5 and combined by two pieces, Fig 26A is a partial resolved diagram of a tenth prefeπed embodiment of an offset pen having the basic stracture of Fig 5 and combined by three pieces. Fig 26B schematically shows a combining manner of the three pieces of the offset pen of Fig 26 A, Fig 26C schematically shows another combining manner of the three pieces of the offset pen of Fig 26A Figs 27A and 27B schematically shows a combining manner of the offset pen having the basic stracture of Fig 25 A and including an ink refill according to the present invention, in which the ink refill is installed into the assembled offset pen. Figs 28A and 28B schematically shows a combining manner of the offset pen having the basic structure of Fig 25 A and including an ink refill according to the present invention, m which the ink refill with a large upper portion is installed into the assembled offset pen, Figs 29A. 29B and 29C schematically shows a combining manner of the offset pen having the basic stracture of Fig 25 A and including a writing tip retracting mean according to the present invention, in which writing tip retracting mean is installed within the offset pen for selectively retracting the writing tip into the writing portion, Fig 30 is a cross-sectional view of a first prefeired embodiment of an offset pen having the basic stracture of Fig 5 and including a linear hollow passage for accommodating therein replaceable writing tips accordmg to the present invention, Fig 3 1 is a cross-sectional view of a second preferred embodiment of an offset pen having the basic stractuie of Fig 5 and including a linear hollow passage for accommodating therein replaceable writing tips according to the piesent invention. Fig 32 schematically shows a connection manner of a series of replaceable writing tips stored in the linear hollow passage of the offset Fig 33 is a cross-sectional view of a third prefeπed embodiment of an offset pen having the basic stracture of Fig 5 and including a linear hollow passage for accommodating therein replaceable writing tips according to the present invention. Figs. 34 A and 34B schematically shows a combining manner of the offset pen having the basic stracture of Fig. 25A and including an assemble-type ink refill according to the present invention, in which the assemble-type ink refill having a connector connected between the ink- soaking refill and the writing tip; and Figs. 34C-34F schematically shows various combining manner of the writing tip and the connector of Fig. 34A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be descπbed more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only; it is not intended to be exhaustive or to be limited to the precise foπn disclosed. Please refer to Fig 5 which shows a basic stracture of an offset pen according to the present invention. The offset pen includes a holding portion 51. an inteπnediate portion 52 and a writing portion 53. The inteπnediate portion 52 is connected between one end 51 1 of the holding portion 51 and one end 531 of the writing portion 53 to make the holding portion 51 and the writing portion 53 positioned in different axes, and create a vacancy 54 between the writing portion 53 and the holding portion 51. While writing, the holding portion 51 can be supported by a user ' s writing hand between the thumb and the index finger, and tips of the thumb and the index finger (see Fig. 1A or IB) can rest on two sides of the inteπnediate portion 52, respectively, according to the writing habit of general users. A writing tip 532 is mounted to the writing portion 53 to leave marks on a working surface 55, for example to write or draw on a piece of paper It is clear that the provision of the vacancy 54 beneath the inteπnediate portion 52 between the writing portion 53 and the holding portion 51 allows the user ' s vision line to be extended to both sides of the writing tip 532 It should be noted that the teπn pen " indicated herein can be any kind of writing tool such as a fountain pen, ball point pen. pencil, brash, coloring pen. electronic sensing pen, etc . as long as a suitable writing tip is mounted to the writing portion of the offset pen EMBODIMENTS OF OFFSET PENS HAVTNG CONCAVTTTF.S ON INTERMEDIATE PORTION In order to make the holding and writing operations smooth and comfortable, two sides of the inteπnediate portion is made to have two concavities 61 and 62 complying with the curvatures of the tips of the thumb and the index fingers, respectively, as shown in Fig 6 which is a schematic top plane view of the offset pen of Fig 5 In addition to the two concavities 61 and 62, it is prefeπed that an upper surface 71 of the intermediate portion 52 is comfortable for the index finger of the user ' s writing hand to press thereagainst to facilitate the holding and writing operations Owing to the provision of such an upper surface, the user can optionally hold the offset pen in a manner as shown in Fig 1 A or IB, or in a manner as shown in Fig 7 A It is to be noted that in Fig 7 A, the arrow indicates the pressing force of the index finger on the upper surface As for the shape of the upper surface, it can be plane (Fig 7B), concave (Fig IC) or convex (Fig 7D), as long as it is comfortable for the pressing finger Preferably, but not necessarily, a hollow passage 81 is aπanged withm the offset pen and extends tlirough the writing portion 53, the inteπnediate portion 52 and the holding portion 51. as shown in Fig. 8, for accommodating therein a writing material supply 533 coπespondmg to the writing tip 532 For example, if the offset pen is a brash, no passage is required On the other hand, if the offset pen is a ball point pen. an elongated ink refill is generally connected to the writing tip 532 for supplying ink Therefore, the passage 81 is needed for accommodating the ink refill 533 In order to make the ink supply relatively smooth, the passage 81 preferably penetrates the crooked intermediate portion 52 tlirough a relatively short path On the other hand, in order to allow the ink refill to penetrate through the crooked inteπnediate portion smoothly, it is prefeπed to make a lower part 521 of the inteπnediate portion 52 larger than an upper part 522 thereof in cross-sectional area EMBODIMENTS OF OFFSET PENS HAVING ILLUMINATING DEVTCE In order to allow an offset pen to be used in a relatively dark environment, an illuminating device can be provided on the intermediate portion to lighten an area near the writing tip Please refer to Fig 9 which is a first prefeπed embodiment of an offset pen including an illuminating device according to the present invention As shown, the illuminating device 91 1 is mounted on a lower part 521 of the intermediate portion 52 and located within the vacancy 54 between the writing portion 53 and the holding portion 51 The presence of the vacancy 54 not only allows the user ' s vision line to be extended to both sides of the writing tip while wπting or drawing, but also allows the light emitted from the illuminating device 91 1 to reach the area 92 near the writing tip 532 Furthermore, if the writing tip 532 is substantially located in an extension line 512 of the holding portion 51 , the light emitted from the illuminating device 91 1 can be centered on the wπting tip 532 so as to enhance the lightening effect The illuminating device 91 1 is a light bulb which is a point light source having a size and a lightening way suitable for a pen, and a battery set 912 is installed in the holding portion 51 for providing power for the light bulb 91 1 via a wire 913 In order to save electric power of the battery set 912, a switch 914 mounted on an end part of the holding portion 51 is provided in this embodiment for controlling the provision of the power from the battery set 912 to the light bulb 91 1 The switch 914 is an exposed rotatable disk, and the user can control the switching-on and switching-off of the light bulb 91 1 by turning the disk Please refer to Figs 10 and 1 1 which are a second and a third prefeπed embodiments of offset pens including illuminating devices according to the piesent invention, respectively As shown, for each of the offset pens, the intermediate portion 52 and the writing portion 53 are transparent so that the light bulb 91 1 can be mounted at any position inside the intermediate portion 52, e g at the lower part 521 (Fig 10) or at a position 523 near the connection between the intermediate portion and the writing portion (Fig 1 1 ) If the intermediate portion is not transparent, the illuminating device can still be mounted inside the intermediate portion at a lower part near a connection position between the intermediate portion and the holding portion In this case, however, an opening 1 1 1 should be arranged at the lower part 521 beneath the light bulb 91 1 to allow light to be transmitted out of the inteπnediate portion 52 to reach the area 92 near the wπting tip 532, as shown in Fig 12 It is apparent that the farther the light bulb 91 1 is installed away from the opening 1 1 1, the smaller the illuminating area 92 becomes Therefore the position of the writing tip 532 should be aπanged to be properly located within the illuminating area 92 In other words, the writing tip 532 is preferably located in an extension line 512 of the holding portion 51 so that light emitted from the light bulb 91 1 can reach the writing tip 532 In another embodiment, the illuminating device 91 1 is mounted on a front surface 524 of the inteπnediate portion 52, as shown in Fig. 13 In a further embodiment, the intermediate portion 52 includes a detachable soft pad 525 at the lower part, as shown in Fig 14 A, which makes the middle finger of the user ' s writing hand optionally sustaining thereagainst feel comfortable while writing The illuminating device 911 is attached on the soft pad 525, as shown in Fig 14B EMBODIMENTS OF OFFSET PENS HAVING PEN CAP In order to avoid blotting and be convenient to be caπied, a pen cap is provided for the offset pen having the basic stracture of Fig 5 Please refer to Figs 15A and 15B which are side views of a first preferred embodiment of an offset pen having the basic stracture of Fig 5 and including a pen cap according to the present invention, in winch the pen cap is capped on the writing portion and the holding portion, respectively The pen cap 15 includes a hollow tube 151 and a clip strip 152 attached onto the hollow tube 151, and there is a special angle α between the hollow tube 151 and the clip strip 152 When the offset pen is not in use, the writing portion 53 is received in the hollow tube 151 to avoid blotting of the writing tip 532 Meanwhile, the clip strip 152 will become axially parallel to the holding portion 51 when the hollow tube 151 caps the writing portion 53 so as to cooperate with the holding portion 51 to allow the offset pen to clamp a holding piece such as pocket cloth, a piece of paper or a plastic pen-holding sleeve of a notebook. When the offset pen is in use, the hollow tube 151 can be taken off from the writing portion 53 and cap on an end part 513 of the holding portion 51. If it is not desired to have the angle α between the hollow tube and the clip strip when the hollow tube caps on the end part of the holding portion, as shown in Fig. 15B, the clip strip can be made to be pivotally attached onto the hollow tube to solve this problem Please refer to Figs. 16A and 16B, the clip strip 162 can be pivotally rotated to have the angle α with the hollow tube 161 to become axially parallel to the holding portion 51 when the hollow tube caps the writing portion 53, and pivotally rotated to become axially parallel to the hollow tube 161 and the holding portion 51 when the hollow tube 161 caps the end part 513 of the holding portion 51. EMBODIMENTS OF ASSEMBLY-TYPE OFFSET PENS In order to make the manufacturing of an offset pen easily, the inteπnediate portion of an offset pen having a crooked passage can be foπned by combining at least two separate pieces according to the present invention. Referring to Fig. 17, the offset pen is foπned by combining two separately integrally foπned pieces 171 and 172, wherein a first piece 171 foπns a part of the writing portion 53, the inteπnediate portion 52 and the holding portion 51, and a second piece 172 foπns the other part of the writing portion 53, the inteπnediate portion 52 and the holding portion 51 The first and the second pieces 171 and 172 can be combined by tooth engagement, as shown in Fig 18 In another embodiment shown in Fig 19, the offset pen is also foπned by combining two separately integrally formed pieces, wherein a first piece 191 foπns a part of the inteimediate portion 52 and the holding portion 51. and a second piece 192 forms the writing portion 53, and the other part of the inteπnediate portion 52 and the holding portion 51 The first and the second pieces 191 and 192 are combined by pivotally connecting the first piece 191 to the second piece 192, as indicated by the aπow In further embodiment shown in Fig 20. the offset pen is also foπned by combining two separately integrally foπned pieces, wherein a first piece 201 forms a part of the intermediate portion 52 and the holding portion 51 , and a second piece 202 foπns the writing portion 53, and the other part of the intermediate portion 52 and the holding portion 51 The first and the second pieces 201 and 202 are combined by pivotally connecting the first piece 201 to the second piece 202, as indicated by the aπow In addition to the above embodiments in which the first piece includes a part of the holding portion and a part of the inteπnediate portion, the first piece can also be a part of the intermediate portion only, such as a rear surface or a side surface Please refer to Fig 21 now The offset pen is foimed by combining a first piece 21 1 as a rear surface with a second piece 212 including the writing portion 53 and the other part of the inteπnediate portion 52, and then screwing the combined writing portion 53 and inteπnediate portion 52 to the holding portion 51 In this embodiment, the first piece 211 is a soft pad The offset pen combined by several pieces has the advantage of easy making, and in addition, the provision of the soft pad 21 1 as the rear surface of the intermediate portion allows the middle finger of the user's writing hand to sustain thereagainst while writing to feel comfortable On the other hand. Fig 22 schematically shows a first piece 221 serving as a side piece to be combined with a second piece 222 including the writing portion 53 and the other part of the intermediate portion 52 Alternatively, the first piece can be a piece 231 serving as a rear and two side surfaces of the intermediate portion, as shown in Fig 23 In a further embodiment shown in Fig 24, the offset pen is foπned by combining seveial separately integrally foπned pieces 241 , 242 and 243, wherein the pieces 241 and 242 form two opposite side surfaces of the inteπnediate portion 52, respectively, and the piece 243 foπns the wπtmg portion 53 and the other part of the intermediate portion 52 The combined writing portion and intermediate portion are then screwed to the holding portion to foπn the offset pen Please refer to Fig 25A In a still further embodiment shown in Fig 25A, the offset pen is also foπned by combining two separately integrally foπned pieces, wherein a first piece 271 forms the holding portion 51 and a part of the inteimediate portion 52. and a second piece 272 foπns the writing portion 53 and the other part of the intermediate portion 52 The first piece 271 and the second piece 272 can be combined by tooth engagement, as shown in Fig 25B Alternatively, in another embodiment shown in Fig 25C, the offset pen is also foπned by combining two separately integrally formed pieces The first piece 273 forms the holding portion 51 and the inteπnediate portion 52, and the second piece 274 foπns the writing portion 53 The first piece 273 and the second piece 274 can be combined by tooth engagement In a further embodiment shown in Fig 26A, the offset pen is foπned by combining several separately integrally foπned pieces, wherein a first piece 261 forms a part of the intermediate portion 52, a second piece 262 forms the other part of the intermediate portion 52 and the writing portion 53, and a third piece foπns the holding portion 51 (not shown) The first piece 261 and the second piece 262 can be combined by tooth engagement, as shown in Fig 26B In addition, the combined intermediate portion and writing portion can be connected to the holding portion by screwmg Alternatively, the connecting interface between the first piece 261 and the second piece 262 can be modified to various foπns as shown by the dotted line x-x, y-y or z-z in Fig 26C By the way, an ink refill 275 can be installed into the assemble-type offset pen easily, as shown in Fig 27A and 27B Certainly, an ink refill 276 with a large upper portion also can be installed into the assemble-type offset pen easily as shown in Fig 28A and 28B In order to produce a retractable offset pen, a writing tip retracting mean is provided Please refer to Fig 29A The offset pen has a basic stracture the same as that of Fig 25 A In this embodiment, the offset pen utilizes a writing tip retracting mean for selectively retracting the writing tip into the writing portion The writing tip retracting mean includes a button 279 engaging with an opening of the holding portion 51 and having a hollow tube for receiving the top part of the ink refill 277 so as to allow the ink refill 277 to be selectively pushed down with respect to the holding portion 51 in response to the operation of a user In addition, there is a spring 278 installed around the ink refill 277 between a fixing element 2771 of the ink refill 277 and an inner surface of the offset pen The spπng 277 has a first end urging against the fixing element 2771 of the ink refill 277 and a second end urging against an inner surface of the offset pen so as to foπn an elastic force to the ink refill 277 in response to the movement of the ink refill 277 Preferably, the second end of the spring 277 is a resilient rod urging against the low part of the inteπnediate portion 52 Accordingly, when the button 279 is depressed, the writing tip 532 is extended out of the writing portion 53, as shown in Fig 29C When the button 279 is released, the writing tip 532 is drawn into the writing portion 53, as shown in Fig 29B By the way, the retractable offset pen can be assembled easily and quickly EMBODIMENTS OF OFFSET PENS HAVTNG INTERNAL SPACE FOR STORING REPLACEABLE WRITING TTPS In order to make an offset pen suitable for using replaceable writing tips, a linear hollow passage is aπanged to accommodate the replaceable writing tips according to the present invention Refemng to Fig 30. the offset pen includes a linear hollow passage 25 having both ends 251 and 252 thereof open into the air. and axially extending through the holding portion 51 and the intermediate portion 52 for accommodating therein a series of replaceable writing tips 534 As shown, each of the writing tip 532 and the replaceable writing tips 534 is of a pencil-type writing material of a short rod shape, and includes a tapered wπting part 535 and a cylindrical base part 536 When the writing tip 532 becomes blunt after being used for a period of time, it can be taken out of the writing portion 53 and inserted into the holding portion 51 from the end 252 of the passage 25 Owmg to the push force resulting from the insertion of the used writing tip, all the replaceable writing tips 534 will move toward the other end 251 of the passage 25, and one of these writing tips 534 will be pushed out of the end 251 Afterwards, the dropped writing tip is inserted into the writing portion 53 as a substitutive writing tip 532 It should be noted that the teπn "pencil " or "pencil-type writing material" used herein indicates any kind of writing or drawing tool or material which will become shorten and blunted owing to rubbing with a working surface to leave a portion of the material as marks on the working surface For example, it can be 2H or 2B black pencil, color pencil or crayon Refer to Fig 31 which schematically shows another prefeπed embodiment of an offset pen of a replaceable pencil type The offset pen also includes a linear hollow passage 25 having both ends 251 and 252 thereof open into the air. and axially extending tlirough the holding portion 51 and the inteπnediate portion 52 for accommodating therein a seπes of replaceable writing tips 534 Likewise, each of the writing tip 532 and the replaceable writing tips 534 is of a short rod shape Further referring to Fig 32. each of the writing tips 532 and 534 includes a head part 537 of a pencil-type writing material, a middle part 538 having a first well 5381 securing thereto the head part 537. and a tail part 539 connected to the middle part 538 and having a second well 5391 for allowing the head part 537 of another writing tip 534 to be received therein When the head part of a next writing tip is inserted to be received in the second well, a stopper stracture 5392 aπanged at the opening of the second wall 5391 stops the middle part 538 of the next writing tip to prevent the tip of the head part 537 from sustaining against the bottom of the middle part 538 so as to prevent from the damage of the head part 537 By this way, the series of replaceable writing tips aligns itself by head-to- tail connection As shown in Fig 3 1 , all the head parts 537 are oriented to the end 251, and all the tail portion 539 are oriented to the holding portion 252, respectively, in the hollow passage 25 Therefore, when the writing tip 532 becomes blunt after being used for a period of time, it can be taken out of the writing portion 53 and inserted into the holding portion 51 from the end 252 of the passage 25 Owing to the push force resulting from the insertion of the used writing tip, all the replaceable writing tips 534 will move toward the other end 251 of the passage 25. and one of these writing tips 534 will be pushed out of the end 251 Afterwards, the dropped writing tip is inserted into the writing portion 53 as a substitutive wπtmg -Alternatively, the head part 537 and the tail part 539 can also be oriented to the ends 252 and 251 , respectively, of the hollow passage 25, as shown m Fig 33 In this case, it is feasible to have one head part 540 of the series of replaceable writing tips in the hollow passage protrade from the holding portion 51 for providing an alternate w riting tip to write or draw When the writing tip 532 or 540 becomes blunt after being used for a period of time, it can be taken out of the writing portion 53 or the holding portion 51. and inserted into the inteπnediate portion 52 from the end 251 of the passage 25 Owing to the push force resulting from the insertion of the used writing tip, all the replaceable writing tips 534 will move toward the other end 252 of the passage 25, and one of these writing tips 534 will be pushed out of the end 252 to be inserted into the writing portion 53 as a substitutive writing tip 532, or to substitute for the writing tip 540 By the way. a pencil-type offset pen has an additional advantage of writing or drawing in different thickness By rotating the offset pen to orient the axis of the writing tip to a specific direction, the angle between the writing tip and the working surface may change so that the area of the writing tip in contact with the working surface may also be different Accordingly, the marks left on the working surface vary in thickness with the rotation of the offset pen EMBODIMENTS OF OFFSET PENS HAVING AN ASSEMBLE-TYPE INK REFILL Please refer to Fig 34A and 34B The offset pen has a basic stracture the same as that of Fig 25 A An assemble-type ink refill is installed into the offset pen The assemble-type ink refill includes an ink-soaking refill 341 arranged within the hollow passage of the holding portion 51 for storing and supplying ink, and a connector 342 aπanged withm the hollow passage of the inteπnediate portion and connected between one end of the ink-soaking iefill 341 and one end of the writing tip 343 The ink-soaking refill 341 is made of hquid-adsorptive material By the way. the writing tool can be modified to an offset pen having an ink-soaking refill, such as one of various marks or ink-loading pen Alternatively, the connector 342 can be modified to various foπns which is well known to one skilled in the art, as shown in Fig 34C, 34D, 34E, and 34F Preferably, the connector 342 is made of a hquid- adsorptive material More preferably , the connector 342 is an introducing tube made of a metal material for introducing the ink from the ink-soakmg refill 341 to the writing tip 343 In addition, the writing tip 343 can be a brush-type writing tip, as shown in Fig 34D In order to make the brush-type writing tip 343 finer, the brash-type writing tip 343 can be surrounded with an outer shell, as shown in Fig 34E Certainly, in another embodiment, the writing tip 343 is made of a hquid-adsorptive material, as shown in Fig 34F The combining manner between the wπting tip 343 and the connector 342 can be modified to various forms, as shown in Fig 34C, 34D, 34E, and 34F Certainly, in another embodiment, the connector 342 can be integrally formed to the writing tip 343 (as shown in Fig 34E) or integrally formed to the ink-soakmg refill 341 In addition, the offset pen may be modified to have an upper cap detachably engaging with an opening of the holding portion so that the ink can be refilled easily To sum up, the present invention uses a nonlinear design for the holding portion and the writing portion of a writing tool to adjust the angle between the writing portion and a working surface to approximately 90 degrees In addition, the crooking of the front portion of the offset pen eliminates the obstraction of the user ' s vision line Furtheπnore, the line- drawing operation can be more precise compared to the conventional one Moreover, the side surfaces with concavities and the upper surface of the inteπnediate portion provide a place for resting the fingers to facilitate the holding and writing operations The provision of an illuminating device allows the offset pen to be used in a relatively dark environment The provision of the specific pen cap allows the offset pen to be earned conveniently By combining at least two pieces separately manufactured, the offset pen having crooked passage therein can be made easily By providing a linear hollow passage having both ends thereof open mto the air and axially extending tlirough the holding portion and the inteπnediate portion, a seπes of replaceable writing tips can be accommodated therein as supplying material Many designs have also been made to the present invention to enhance its attractions While the invention has been described in teπns of what are presently considered to be the most practical and prefeπed embodiments, it is to be understood that the invention need not be limited to the disclosed embodiment On the contrary, it is intended to cover various modifications and similar aπangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar stractures

Claims: WHAT IS CLAIMED IS 1 An offset pen comprising a holding portion to be supported by a user ' s writing hand, a writing portion to be mounted thereon a writing tip to leave marks on a working surface, and an inteπnediate portion substantially connected between one end of said holding portion and one end of said wπting portion to make said holding portion and said writing portion positioned in different axes, and create a vacancy between said writing portion and said holding portion, and characterized in that said intermediate portion has two concavities on two sides thereof, respectively, optionally provided for two fingers of said user ' s writing hand to rest thereon so as to facilitate the holding and wπtmg operations 2 The offset pen according to claim 1 wherein while writing, said holdmg portion is supported between the thumb and the index finger of said user ' s writing hand, and tips of the thumb and the index finger of said user ' s writing hand rest on said two concavities 3 The offset pen according to claim 1 wherein said intermediate portion further has an upper surface optionally provided for a tip of a finger of said user ' s writing hand to press against to facilitate the holding and writing operations while writing The offset pen according to claim 3 wherein said finger of said user's writing hand to press against said upper surface while writing is the index finger The offset pen according to claim 3 wherein said upper surface of said intermediate portion is a plane surface The offset pen according to claim 3 wherein said upper surface of said inteπnediate portion is a concave surface 7 The offset pen according to claim 3 wherein said upper surface of said inteπnediate portion is a convex surface 8 The offset pen according to claim I wherein a hollow passage is aπanged within said offset pen and extends tlirough said writing portion, said intermediate portion and said holding portion for accommodating therein said writing tip and a writing material supply coπesponding to said writing tip 9 The offset pen according to claim 8 wherein a lower part of said inteπnediate portion is larger than an upper part thereof in cross- sectional area so that said writing material supply penetrates tlirough said inteπnediate portion smoothly 10. The offset pen according to claim 9 wherein said offset pen is a ball point pen, and said writing material supply is an elongated ink refill. 11.An offset pen comprising a holding portion to be supported by a user ' s wπting hand, a writing portion to be mounted thereon a writing tip to leave marks on a working surface, an inteπnediate portion substantially connected between one end of said holding portion and one end of said writing portion to make said holding portion and said writing portion positioned in different axes, and create a vacancy between said writing portion and said holding portion, and an illuminating device mounted to said inteπnediate portion to lighten an area near said writing tip 12. The offset pen according to claim 1 1 wherein said illuminating device is mounted on a lower part of said intermediate portion and located withm said vacancy between said writing portion and said holding portion The offset pen according to claim 1 1 wherein said inteπnediate portion is transparent, and said illuminating device is mounted inside said inteπnediate portion The offset pen according to claim 1 1 wherein said illuminating device is mounted inside said inteπnediate portion at a lower part near a connection position between said inteπnediate portion and said holding portion, and an opening is arranged at said lower part beneath said illuminating device so as to allow light to be transmitted out of said inteπnediate portion to reach said area near said wπting tip The offset pen according to claim 14 wherein said wπting tip is substantially located in an extension line of said holding portion so that light emitted from said illuminating device can be centered on said writing tip The offset pen according to claim 14 wherein said inteπnediate portion includes a detachable soft pad at said lower part, and said illuminating device is attached on said soft pad The offset pen according to claim 1 1 wherein said illuminating device is mounted on a front surface of said inteπnediate portion The offset pen according to claim 1 1 wherein said writing portion is transparent, and said illuminating device is mounted mside said inteπnediate portion at a position near the connection between said inteπnediate portion and said writing portion The offset pen according to claim 1 1 wherein said illuminating device is a point light source The offset pen according to claim 19 wherein said illuminating device is a light bulb 21 The offset pen according to claim 1 1 wherein a battery for supplying power for said illuminating device is installed in said holding portion. 22 -An offset pen comprising a holding portion to be supported by a user ' s writing hand, a writing portion to be mounted thereon a writing tip to leave marks on a working surface, an inteπnediate portion substantially connected between one end of said holding portion and one end of said writing portion to make said holding portion and said writing portion positioned in different axes, and create a vacancy between said writing portion and said holding portion, and a pen cap including a hollow tube for receiving said writing portion therein to avoid blotting of said writing tip when said offset pen is not in use, and a clip strip attached onto said hollow tube, and having an angle with said hollow tube to become axially parallel to said holding portion when said hollow tube caps said writing portion so as to cooperate with said holding portion to allow said offset pen to clamp a holding piece 23. The offset pen according to claim 22 wherein said hollow tube can cap an end part of said holding portion when said offset pen is in use 24 The offset pen according to claim 23 wherein said clip strip is pivotally attached onto said hollow tube so that said clip strip can be pivotally rotated to have said angle with said hollow tube to become axially parallel to said holding portion when said hollow tube caps said writing portion, and pivotally rotated to become axially parallel to said hollow tube when said hollow tube caps said end part of said holding portion 25 An offset pen. comprising a holding portion to be supported by a user ' s writing hand, a writing portion to be mounted thereon a writing tip to leave marks on a working surface, and an inteπnediate portion substantially connected between one end of said holding portion and one end of said writing portion to make said holding portion and said wπting portion positioned in different axes, and create a vacancy between said writing portion and said holding portion, and characterized in that said offset pen is foπned by combining at least two separate pieces 26 The offset pen according to claim 25 being foπned by combining two separately integrally fonned pieces, a first piece of which forms a part of said writing portion, said inteπnediate portion and said holdmg portion, and a second piece of which foπns the other part of said writing portion, said inteπnediate portion and said holding portion 7 The offset pen according to claim 26 wherein said first and said second pieces are combined by tooth engagement 8 The offset pen according to claim 25 being foπned by combining two separately integrally formed pieces, a first piece of which foπns a part of said inteπnediate portion and said holding portion, and a second piece of which foπns said writing portion, and the other part of said inteπnediate portion and said holding portion 9 The offset pen according to claim 28 wherein said first and said second pieces are combined by pivotally connecting said first piece to said second piece 0 The offset pen according to claim 25 being foπned by combining three separately integrally foπned pieces, a first piece of which foπns a part of said inteπnediate portion, a second piece of which foπns said writing portion and the other part of said inteπnediate portion, and a third piece of which foπns said holding portion, and connecting said combined writing portion and inteπnediate portion to said holding portion. 31. The offset pen according to claim 30 wherein said first piece foπns a side surface of said intermediate portion. 32. The offset pen according to claim 30 wherein said first piece foπns a rear surface of said inteπnediate portion. 33. The offset pen according to claim 32 wherein said first piece is a soft pad. 34. The offset pen according to claim 30 wherein said combined writing portion and inteπnediate portion are connected to said holding portion by screwing. 35. The offset pen according to claim 25 being foπned by combining four separately integrally foπned pieces, a first piece of which foπns a part of said intermediate portion, a second piece of winch foπns another part of said inteπnediate portion, a third piece of which foπns said writing portion and the other part of said intermediate portion, and a fourth piece of which foπns said holding portion, and connecting said combined writing portion and inteπnediate portion to said holding portion. 36. The offset pen according to claim 35 wherein said first and said second pieces foπn two opposite side surfaces of said inteπnediate portion, respectively. separately integrally foπned pieces, a first piece of which foπns said holding portion and a part of said intermediate portion, and a second piece of which forms the other part of said inteπnediate portion and said writing portion The offset pen according to claim 37 wherein said first and said second pieces are combined by tooth engagement The offset pen according to claim 25 bemg foπned by combining three separately integrally foπned pieces, a first piece of which foπns a part of said inteπnediate portion, a second piece of which foπns the other part of said inteπnediate portion and said writing portion, and a three piece of which foπns said holding portion, and connecting said combined writing portion and inteπnediate portion to said holding portion The offset pen according to claim 39 wherein said combined writing portion and said inteπnediate portion is connected to said holding portion by screwing The offset pen according to claim 39 wherein said first piece and said second piece are combined by tooth engagement The offset pen according to claim 25 being foπned by combining two separately integrally foπned pieces, a first piece of which foπns said holding portion and said inteπnediate portion, and a second piece of which foπns said wπting portion The offset pen according to claim 42 wherein said first piece and said second piece are combined by tooth engagement The offset pen according to claim 25 wherein said offset pen ftirther includes a writing tip retracting mean for selectively projectmg and retracting said writing tip with respect to said writing portion 45. The offset pen according to claim 44 wherein said writing tip retracting mean includes: a button mounted in the top end of said holding portion, and having a hollow tube for receiving the top end of an ink refill so as to allow said ink refill to be selectively pushed down with respect to said holding portion in response to the operation of a user; and a spring installed around said ink refill, and having a first end urging against a fixing element of said ink refill and a second end urging against an inner surface of said offset pen so as to foπn an elastic force to said ink refill in response to the movement of said ink refill. 46. The offset pen according to claim 45 wherein said second end of said spring is a resilient rod urging against a low part of said inteπnediate portion. 47. The offset pen according to claim 45 wherein said writing tip of said ink refill is extended out of said writing portion when said button is depressed, and said writing tip of said ink refill is drawn into said writing portion when said button is released. 48. The offset pen according to claim 25 wherein said offset pen ftirther includes a clip strip attached to said holding portion thereof to allow said offset pen to clamp a holding piece. 49. An offset pen, comprising: a holding portion to be supported by a user's writing hand; a writing portion to be mounted thereon a writing tip to leave marks on a working surface; and an inteπnediate portion substantially connected between one end of said holding portion and one end of said writing portion to make said holding portion and said writing portion positioned in different axes, and create a vacancy between said writing portion and said holding portion, and characterized in that a linear hollow passage having both ends thereof open into the air axially extends tlirough said holding portion and said inteπnediate portion for accommodating therein a seπes of replaceable writing tips 50 The offset pen according to claim 49 wherein each of said writing tip and said replaceable writing tips is of a short rod shape 51 The offset pen according to claim 50 wherein each of said writing tip and said replaceable writing tips is of a pencil-type wπting mateπal 52 The offset pen according to claim 51 wherein each of said writing tip and said replaceable wπting tips includes a tapered writing part and a cylindrical base part 53 The offset pen according to claim 50 wherein each of said wπtmg tip and said replaceable writing tips includes a head part of a pencil-type writing material, a middle part having a first well securing thereto said head part, and a tail part connected to said middle part and having a second well for allowing said head part of another writing tip to be received therein 4 The offset pen according to claim 53 wherein a stopper stracture is arranged at the opening of said second wall for stopping said middle part of said another writing tip when said head part of said another wπting tip is inserted to be received in said second well 5 The offset pen according to claim 54 wherein said series of replaceable wntmg tips aligns itself by head-to-tail connection 56. The offset pen according to claim 55 wherein said head part and said tail part are oriented to said inteπnediate portion and said holding portion, respectively, in said hollow passage. 57. The offset pen according to claim 56 wherein said head part and said tail part are oriented to said holding portion and said inteπnediate portion, respectively, in said hollow passage. 58. The offset pen according to claim 57 wherein one said head part of said series of replaceable writing tips in said hollow passage protrudes from said holding portion for providing an alternate writing tip to leave marks on said working surface. 59. An offset pen, comprising: a holding portion to be supported by a user's writing hand; a writing portion to be mounted thereon a writing tip to leave marks on a working surface; an inteπnediate portion substantially connected between one end of said holding portion and one end of said writing portion to make said holding portion and said writing portion positioned in different axes, and create a vacancy between said writing portion and said holding portion; and characterized in that said writing tip is connected to an ink- soaking refill by a connector. 60. The offset pen according to claim 59 wherein said ink-soaking refill is aπanged within a hollow passage of said holding portion for storing and supplying ink. 61. The offset pen according to claim 59 wherein said connector is aπanged within said inteπnediate portion and substantially connected between one end of said ink-soaking refill and one end of said writing tip so as to allow said writing tip to obtain the ink from said ink- soaking refill. 62. The offset pen according to claim 59 wherein said ink-soaking refill is made of liquid-adsorptive material. 63. The offset pen according to claim 59 wherein said connector is made of a liquid-adsorptive material. 64. The offset pen according to claim 59 wherein said connector is an introducing tube made of a metal material. 65. The offset pen according to claim 59 wherein said offset pen further includes an upper cap detachably engaging with an opening of said holding portion. 66. The offset pen according to claim 59 wherein said connector is integrally foπned to said writing tip. 67. The offset pen according to claim 59 wherein said connector is integrally foπned to said ink-soaking refill. 68. The offset pen according to claim 59 wherein said writing tip is a brash-type writing tip. 69. The offset pen according to claim 59 wherein said writing tip is made of a liquid-adsorptive material.

Inventors: LIU BOA-SHEN, LIU, BOA-SHEN
Applicants: HUANG ALICE Y, LIU BOA SHEN, HUANG, ALICE, Y., LIU, BOA-SHEN
Application year: 1999
Main classification: A46B5
IPC codes: B43K7, B43K21, B43K23, B43K27, B43K29