CA1201997A - Propelling pencil - Google Patents
Propelling pencilInfo
- Publication number
- CA1201997A CA1201997A CA000468367A CA468367A CA1201997A CA 1201997 A CA1201997 A CA 1201997A CA 000468367 A CA000468367 A CA 000468367A CA 468367 A CA468367 A CA 468367A CA 1201997 A CA1201997 A CA 1201997A
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- CA
- Canada
- Prior art keywords
- lead
- chuck
- outer cylinder
- sleeve
- cushion
- 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
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- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A knock-type propelling pencil comprising a lead pipe inserted into an outer cylinder and having a lead chuck at the end portion thereof, a chuck-fastening tube for fasten-ing the lead chuck, a cushion sleeve coming into contact with said chuck-fastening tube being slidable relative to said outer cylinder, and being urged by a spring, wherein said cushion sleeve has a cushion portion which can be resiliently deformed to absorb excessive writing pressure and thereby preventing breaking of the lead.
A knock-type propelling pencil comprising a lead pipe inserted into an outer cylinder and having a lead chuck at the end portion thereof, a chuck-fastening tube for fasten-ing the lead chuck, a cushion sleeve coming into contact with said chuck-fastening tube being slidable relative to said outer cylinder, and being urged by a spring, wherein said cushion sleeve has a cushion portion which can be resiliently deformed to absorb excessive writing pressure and thereby preventing breaking of the lead.
Description
PROPELI.ING PENCIL
BAC_ _ OUND OF THE INVENTION
This invention relates to a knock-type propelling pencil, and more specifically relates to such a propel-ling pencil as prevents breaking of a lead by absorbing resiliently the force to the lead when an excessive pressure is applied to the leadO
A brief discussion of the prior art is provided below with reference to Fig. 1 of the accompanying drawings.
For convenience, however, all of the drawings are first explained, as follows.
BRIEF DFSCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view showing major portions of a conventional propelling pencil provided with a protect function free from breaking of a lead, Fig. 2 is a vertical section view showing a propelling pencil according to an embodiment of the present invention;
Fig. 3 is a vertical section view showing major portions in Fig. 2;
Fig. 4A is a plan view showing a cushion sleeve of Fig. 2;
Fig. 4B is a sectional view illustrated at 4-4 line of Fig. 4A;
Fig. 5A, Fig. SA and Fig. 7A are plan views showing other embodiments for the cushion sleeve;
Fig. 5B, Fig. 6B and Fig. 7B are sectional views '"' ' ~;
g~7 illustrated respectively at 5-5 line, 6-6 line and 7-7 line corresponding to Fig. 5A, Fig. 6A and Fig. 7A;
Fig. 8A is a vertical section view showing another embodiment of the cushion sleeve;
Fig. 8B is a side view showing the cushion sleeve of Fig. 8A;
Fig. 9A is a plan view showing the last embodiment of the cushion sleeve;
Fig. 9B is a side view showing the cushion sleeve of Fig. 9A;
Fig. lOA is a plan view showing an outer cylinder around a stopper hole;
Fig. lOB is a vertical section view on the basis of Fig. lOA;
Fig. 11 is a vertical section view showing major portions of the propelling pencil according to the other embodiment of the present invention;
Fig. 12 is a vertical section view showing tip portions of the propelling pencil according to still another embodiment of the present invention, Fig. 13 is an explosional cross-sight view showing major portions of the propelling pencil according to the last e~bodiment of the present invention; and FigO 14 is a vertical section view showing major portions in the assembled condition of the propelling pencil in Fig. 13.
t7 DISCUSSION OF T~IE P:~IOR A~T
_ .
A conventional propelling pencil as shown in ~ig. 1 has heretofore been proposed, in which a protect function free from breaking of a lead has been provided.
In Fig~ 1, reference numeral 1 is a holder, reference numeral 2 is a lead sto:ring cylinder which is inserted into the holder 1 slidably to the direction of the axls, reference numeral 3 is a lead chuck fixed in the tip of the lead storing cylinder 2, reference numeral ~ is a chuck ring loosely fitted to the tip of the lead chuck 3.
Moreover, reference numeral 5 is a sleeve disposed between aforesaid chuck ring 4 and aforesaid holder 1 and slidably inserted into the aforesaid lead chuck 3, and in the rear portion of the sleeve 5, a spring 7 is disposed between the rear portion and the stopper 8 within the holder 1.
The spring 7 is effected in such a manner that the break of a lead is prevented by way of absorbing motion of the pressure to a lead, when the lead chuck 3 is appli.ed an excessive pressure in the use of the pencil. The sleeve 5 is also provided with the another spring 6 to actuate -the aforementioned lead storing cylinder 2 to put forward to the return direction, and to be wound around the lead chuck 3.
Then, assuming that the knocked portion (not shown) in the end of the lead storing cylinder 2 is pushed, the lead storing cylinder 2 is moved to the front direction against the actuating forc~ of the spring 6 to open the lead chuck 3, and the lead lb projects out of the tip of the cap la to be sent in the predetermined length. In the condition of writing operation, if the excessive lead pressure is added thereto, the sleeve 5 is moved backward through the lead chuck 3 against the actuating force of the spring 7.
Accordlng to this backward motion, the excessive lead pressure is absorbed resiliently so -that the break of a lead will be prevented.
However, since the construction requires the fact that the sleeve 5 is forrned out of a me-tal pipe in which the spring 7 is provided, there are some defects in such a manner that the fact makes it difficult to manufacture and assemble them and also causes the material cost to increase into high cost.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a propelling pencil, in which the number of parts is decreased and the efficiency for assembling works is risen up so that the pencil can be produced at a reduced cost and promises well-touching operation.
According to an aspect of this invention there is provided a propelling pencil comprising: an outer cylinder composed of a synthetic resin molded as a unitary structure which will be gripped during the writing and which has at least one engaging hole formed in the periphery on the front side thereof; a resilient engaging member which has, on the outer peripheral rear portion, at least one protrusion tha-t engages with said engaging hole, and which has an inner flange at the front end thereof; a lead chuck which is slidably inserted in the engaging member, and which is attached to an end of a lead pipe; a chuck-fastening tube loosely fitted to a chuck portion at the end of the lead chuck; and a spring which is disposed between said inner rlange and one end of said lead pipe, and which so urges the lead chuck that the chuck portion is squeezed by the chuck-fastening tube.
9~
Other aspects of thix invention are disclosed in our co-pending Canadian Patent Applica-tion Serial No, 410,839 filed on August 25, 1982, of which the present application is a division.
PRE:E`ERRED EMBODIMENT OF THE INVENTION
Hereinafter there will be described in detail embodiments of this invention by way of the accompanying drawings.
Referring to Figs. 2 and 3, an outer cylinder 11 is molded up to a portion of tip fitting 12 as a unitary structure. A guide portion 13 is fitted to the end of the outer cylinder 11, and a lead pipe 14 is accommodated in the outer cylinder 11 to slide in the axial direction.
A knock portion is detachably attached to the rear end of the lead pipe 14, and a lead chuck 16 is fitted to the other end of the lead pipe 14. The end of the lead chuck 1~ penetrates through a hole formed in the center of a chuck-fastening tube 17 which has a ]-shape in cross section. The rear end of the chuck-fastening tube 17 is brought into contact with the front end of a cushion sleeve 19 which is slidable in the outer cylinder 11 in the axial direction, and which is forwardly urged by a spring ~resilient member) 18., The cushion sleeve 19 constitutes one of the important elements of this invention, and is composed of an elastic material which can be elastically deformed. As shown in Figs. 3 and 4, furthermore, the cushion sleeve 19 consists of a sleeve portion 110 and a cushion por-tion 111 which is molded together with the sleeve portion 110 as a unitary structure, and which can be retractably stretched in the axial direction. The cushion sleeve 19 is secured to the outer cylinder 11 via its engaging projection 112 which engages with a stopper hole lla in the outer cylinder 11. Reference numeral 13a depic-ts a lead guide made of rubber.
As shown in Figs. 3 and 4, furthermore, a slit llla is formed in the cushion portion 111 of the cushion sleeve 19, so that the cushion portion 111 is deflected in -the direction of diameter, and the engaging projec-tion 112 is reliably engaged with the stopper hole llla in the outer cylinder 11. Further, the cushion portion 111 has a diameter greater than that of the sleeve portion 110. The cushion portion 111 further has a hole lllb formed in the circumferential direction so that it can be retractably stretched in the axial direction. As will be mentioned later, therefore, a second spring is not required to urge the sleeve forward, enabling the assembling operation to be greatly simplified, and the number of parts to be reduced.
Figs. 5 to 9 illustrate the cushion sleeve 19 according to another embodiment in which the shape and construction of the slit llla and hole lllb are modified such that the cushion sleeve 19 reliably engages with the stopper hole lla in the outer cylinder 11 and retractably stretches in the axial direction. The engaging projection 112, slit llla, and hole lllb may be constructed in any form provided the cushion portion 111 can be effectively deformed.
The stopper hole lla for engagement with the engaging projection 112 of the cushion sleeve lg is so formed as to penetrate through -the peripheral wall of the ~ Z~?~ ~ ~ 7 outer cylinder 11 as shown in Figs. 2, 3 and 10. Further, a sleeve guide groove 113 is formed in the inner wall of the outer cylinder 11 along the axial direction as shown in Fig. 10B. When the lead-propelling mechanism consisting of lead pipe 4, lead chuc~ 16 and cushion sleeve 19, is to be incorporated from the rear end of the outer cylinder 11, the sleeve guide groove 113 works to reliably bring the engaging projection 112 into engagement with the stopper hole lla formed in the outer cylinder 11. For this purpose, the sleeve guide groove 113 stretches from the stopper hole lla to the rear end of the outer cylinder 11. Here, however, the sleeve guide groove 113 may be formed only in the vicinity of the stopper hole lla to fully exhibit its function for guiding the engaging projection 112.
Opera-tion of the invention and the order of assembling will be mentioned belowr First, the cushion sleeve 19 and the cushion portion 111 have been formed as a unitary struc-ture.
Therefore, the lead-propelling mechanism can be inserted into the outer cylinder enabling the operation efficiency to be enhanced. Further, since the second spring is not required to absorb excessive writing pressure, the number of parts can be reduced, and the pencil can be cheaply manufactured.
Further, since the lead-propelling mechanism is inserted from the rear end of the outer cylinder 11, it is permitted to mold -the outer cylinder 11 as a unitary structure up to the portion of tip fitting 12 thereof.
Accordingly, the operation efficiency can be increased, the number of parts can be reduced, and the manufacturing cost can be reduced. As required, furthermore, the outer cylinder 11 can be formed as a unitary structure up to -the guide portion 13. In this case, the operation efEiciency can be further increased -to reduce the manufacturing cost.
In carrying out the assembling operation, the engaging projection 112 of the cushion sleeve is reliably and simply brought into engagement with the stopper hole lla of the outer cylinder 11 since the sleeve guide groove 113 has been formed in the inner wall of the outer cylinder 11.
Owing to this engagement, furthermore, position of the cushion sleeve 19 is not deviated.
In the propelling pencil which is completely assembled as mentioned above, not only the spring 18 for knocking but also the cushion portion 111 having a small modulus of elasticity work to absorb excessive writing pressure, the cushion portion 111 of the cushion sleeve 19 contracts as indicated by a dotted line in Fig. 3 in case an excessively great writing pressure is exerted on the lead 114. That is, the lead 114 retracts into the outer cylinder 11, and is no-t broken.
Fig. 11 shows an engaging portion of the engaging projection 112 according to another embodiment of this invention, in which the engaging projection 112 of the cushion sleeve 19 is brought into engagement with a stepped portion llb in the inner wall instead of the s-topper hole lla.
This embodiment exhibits the same effects as those of the above-mentioned embodiment. In this embodiment, however, the outer cylinder 11 can be produced more simply since there is no need of forming the stopper hole lla and the sleeve guide groove 113.
In the case of this embodiment, however, it is desired that the tip fitting 12 ana the guide portion 13 of Fig. 2 are formed separately from the outer cylinder 11.
According to this invention as mentioned above, the sleeve has a spring function for absorbing excessively great writing pressure. Furthermore, the assembling efficiency can be increased strikingly, and -the number of par-ts can be reduced to remarkably decrease the manufacturing cost.
Fig. 12 is a vertical section view showing tip portions of the propelling pencil according to s-till another embodiment of this invention. As compared with the propelling pencil of the embodiment in Fig. 2, that of Fig. 12 is provided with an outer cylinder 11 united with the tip fitting 13' and a lead guide portion 13a'.
This structure makes it easier to automatically assemble the propelling pencils.
Figs. 13 and 14 are a perspective view showing a knock-type propelling pencil according to the o-ther embodiment of this invention in a disassembled manner, and a section view illustrating major portions thereof, in which reference numeral 21 denotes an outer cylinder composed of a synthetic resin of a good quality, which is molded as a unitary structure and which will be gripped by a person who writes. The outer cylinder 21 has a core guide hole 21a in a tip portion thereof and an engaging hole 21b in the outer peripheral portion thereoE.
In the outer cylinder 21 is placed a cup-shaped resilient engaging member 22 whlch has, on the peripheral rear end portion thereof, a tapered protrusion 22b that engages with said engaging hole 21b, and an inner flange 22a g d~9t7 at an end portion thereof. In the engaging member 22 is slidably inserted a lead pipe 23. A chuck-fastening tube 25 has been fitted to a chuck portion 24a at the end of a lead chuck 24 that is attached to an end 23a of -the lead pipe 23.
A spring 26 is interposed between the inner flange 22a and -the end 23a of the lead pipe 23, and so urges the lead chuck 24 that the chuck portion 24a is squeezed by the chuck-fastening tube 25.
Further, the engaging member 22 and the lead chuck 24 may be assembled together as a unitary structure, the lead chuck 24 being provided with a lead pipe 23 with a chuck-fastening tube 25 being fitted thereto via a spring.
The above assembly is inserted in the ou-ter cylinder 21 from -the side of the rear end overcoming the resilient force of the tapered protrusion 22b which will then engage with the engaging hole 2lb.
According to this invention as mentioned above, the assembly is incorporated into -the outer cylinder 21 by
BAC_ _ OUND OF THE INVENTION
This invention relates to a knock-type propelling pencil, and more specifically relates to such a propel-ling pencil as prevents breaking of a lead by absorbing resiliently the force to the lead when an excessive pressure is applied to the leadO
A brief discussion of the prior art is provided below with reference to Fig. 1 of the accompanying drawings.
For convenience, however, all of the drawings are first explained, as follows.
BRIEF DFSCRIPTION OF THE DRAWINGS
Fig. 1 is a sectional view showing major portions of a conventional propelling pencil provided with a protect function free from breaking of a lead, Fig. 2 is a vertical section view showing a propelling pencil according to an embodiment of the present invention;
Fig. 3 is a vertical section view showing major portions in Fig. 2;
Fig. 4A is a plan view showing a cushion sleeve of Fig. 2;
Fig. 4B is a sectional view illustrated at 4-4 line of Fig. 4A;
Fig. 5A, Fig. SA and Fig. 7A are plan views showing other embodiments for the cushion sleeve;
Fig. 5B, Fig. 6B and Fig. 7B are sectional views '"' ' ~;
g~7 illustrated respectively at 5-5 line, 6-6 line and 7-7 line corresponding to Fig. 5A, Fig. 6A and Fig. 7A;
Fig. 8A is a vertical section view showing another embodiment of the cushion sleeve;
Fig. 8B is a side view showing the cushion sleeve of Fig. 8A;
Fig. 9A is a plan view showing the last embodiment of the cushion sleeve;
Fig. 9B is a side view showing the cushion sleeve of Fig. 9A;
Fig. lOA is a plan view showing an outer cylinder around a stopper hole;
Fig. lOB is a vertical section view on the basis of Fig. lOA;
Fig. 11 is a vertical section view showing major portions of the propelling pencil according to the other embodiment of the present invention;
Fig. 12 is a vertical section view showing tip portions of the propelling pencil according to still another embodiment of the present invention, Fig. 13 is an explosional cross-sight view showing major portions of the propelling pencil according to the last e~bodiment of the present invention; and FigO 14 is a vertical section view showing major portions in the assembled condition of the propelling pencil in Fig. 13.
t7 DISCUSSION OF T~IE P:~IOR A~T
_ .
A conventional propelling pencil as shown in ~ig. 1 has heretofore been proposed, in which a protect function free from breaking of a lead has been provided.
In Fig~ 1, reference numeral 1 is a holder, reference numeral 2 is a lead sto:ring cylinder which is inserted into the holder 1 slidably to the direction of the axls, reference numeral 3 is a lead chuck fixed in the tip of the lead storing cylinder 2, reference numeral ~ is a chuck ring loosely fitted to the tip of the lead chuck 3.
Moreover, reference numeral 5 is a sleeve disposed between aforesaid chuck ring 4 and aforesaid holder 1 and slidably inserted into the aforesaid lead chuck 3, and in the rear portion of the sleeve 5, a spring 7 is disposed between the rear portion and the stopper 8 within the holder 1.
The spring 7 is effected in such a manner that the break of a lead is prevented by way of absorbing motion of the pressure to a lead, when the lead chuck 3 is appli.ed an excessive pressure in the use of the pencil. The sleeve 5 is also provided with the another spring 6 to actuate -the aforementioned lead storing cylinder 2 to put forward to the return direction, and to be wound around the lead chuck 3.
Then, assuming that the knocked portion (not shown) in the end of the lead storing cylinder 2 is pushed, the lead storing cylinder 2 is moved to the front direction against the actuating forc~ of the spring 6 to open the lead chuck 3, and the lead lb projects out of the tip of the cap la to be sent in the predetermined length. In the condition of writing operation, if the excessive lead pressure is added thereto, the sleeve 5 is moved backward through the lead chuck 3 against the actuating force of the spring 7.
Accordlng to this backward motion, the excessive lead pressure is absorbed resiliently so -that the break of a lead will be prevented.
However, since the construction requires the fact that the sleeve 5 is forrned out of a me-tal pipe in which the spring 7 is provided, there are some defects in such a manner that the fact makes it difficult to manufacture and assemble them and also causes the material cost to increase into high cost.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a propelling pencil, in which the number of parts is decreased and the efficiency for assembling works is risen up so that the pencil can be produced at a reduced cost and promises well-touching operation.
According to an aspect of this invention there is provided a propelling pencil comprising: an outer cylinder composed of a synthetic resin molded as a unitary structure which will be gripped during the writing and which has at least one engaging hole formed in the periphery on the front side thereof; a resilient engaging member which has, on the outer peripheral rear portion, at least one protrusion tha-t engages with said engaging hole, and which has an inner flange at the front end thereof; a lead chuck which is slidably inserted in the engaging member, and which is attached to an end of a lead pipe; a chuck-fastening tube loosely fitted to a chuck portion at the end of the lead chuck; and a spring which is disposed between said inner rlange and one end of said lead pipe, and which so urges the lead chuck that the chuck portion is squeezed by the chuck-fastening tube.
9~
Other aspects of thix invention are disclosed in our co-pending Canadian Patent Applica-tion Serial No, 410,839 filed on August 25, 1982, of which the present application is a division.
PRE:E`ERRED EMBODIMENT OF THE INVENTION
Hereinafter there will be described in detail embodiments of this invention by way of the accompanying drawings.
Referring to Figs. 2 and 3, an outer cylinder 11 is molded up to a portion of tip fitting 12 as a unitary structure. A guide portion 13 is fitted to the end of the outer cylinder 11, and a lead pipe 14 is accommodated in the outer cylinder 11 to slide in the axial direction.
A knock portion is detachably attached to the rear end of the lead pipe 14, and a lead chuck 16 is fitted to the other end of the lead pipe 14. The end of the lead chuck 1~ penetrates through a hole formed in the center of a chuck-fastening tube 17 which has a ]-shape in cross section. The rear end of the chuck-fastening tube 17 is brought into contact with the front end of a cushion sleeve 19 which is slidable in the outer cylinder 11 in the axial direction, and which is forwardly urged by a spring ~resilient member) 18., The cushion sleeve 19 constitutes one of the important elements of this invention, and is composed of an elastic material which can be elastically deformed. As shown in Figs. 3 and 4, furthermore, the cushion sleeve 19 consists of a sleeve portion 110 and a cushion por-tion 111 which is molded together with the sleeve portion 110 as a unitary structure, and which can be retractably stretched in the axial direction. The cushion sleeve 19 is secured to the outer cylinder 11 via its engaging projection 112 which engages with a stopper hole lla in the outer cylinder 11. Reference numeral 13a depic-ts a lead guide made of rubber.
As shown in Figs. 3 and 4, furthermore, a slit llla is formed in the cushion portion 111 of the cushion sleeve 19, so that the cushion portion 111 is deflected in -the direction of diameter, and the engaging projec-tion 112 is reliably engaged with the stopper hole llla in the outer cylinder 11. Further, the cushion portion 111 has a diameter greater than that of the sleeve portion 110. The cushion portion 111 further has a hole lllb formed in the circumferential direction so that it can be retractably stretched in the axial direction. As will be mentioned later, therefore, a second spring is not required to urge the sleeve forward, enabling the assembling operation to be greatly simplified, and the number of parts to be reduced.
Figs. 5 to 9 illustrate the cushion sleeve 19 according to another embodiment in which the shape and construction of the slit llla and hole lllb are modified such that the cushion sleeve 19 reliably engages with the stopper hole lla in the outer cylinder 11 and retractably stretches in the axial direction. The engaging projection 112, slit llla, and hole lllb may be constructed in any form provided the cushion portion 111 can be effectively deformed.
The stopper hole lla for engagement with the engaging projection 112 of the cushion sleeve lg is so formed as to penetrate through -the peripheral wall of the ~ Z~?~ ~ ~ 7 outer cylinder 11 as shown in Figs. 2, 3 and 10. Further, a sleeve guide groove 113 is formed in the inner wall of the outer cylinder 11 along the axial direction as shown in Fig. 10B. When the lead-propelling mechanism consisting of lead pipe 4, lead chuc~ 16 and cushion sleeve 19, is to be incorporated from the rear end of the outer cylinder 11, the sleeve guide groove 113 works to reliably bring the engaging projection 112 into engagement with the stopper hole lla formed in the outer cylinder 11. For this purpose, the sleeve guide groove 113 stretches from the stopper hole lla to the rear end of the outer cylinder 11. Here, however, the sleeve guide groove 113 may be formed only in the vicinity of the stopper hole lla to fully exhibit its function for guiding the engaging projection 112.
Opera-tion of the invention and the order of assembling will be mentioned belowr First, the cushion sleeve 19 and the cushion portion 111 have been formed as a unitary struc-ture.
Therefore, the lead-propelling mechanism can be inserted into the outer cylinder enabling the operation efficiency to be enhanced. Further, since the second spring is not required to absorb excessive writing pressure, the number of parts can be reduced, and the pencil can be cheaply manufactured.
Further, since the lead-propelling mechanism is inserted from the rear end of the outer cylinder 11, it is permitted to mold -the outer cylinder 11 as a unitary structure up to the portion of tip fitting 12 thereof.
Accordingly, the operation efficiency can be increased, the number of parts can be reduced, and the manufacturing cost can be reduced. As required, furthermore, the outer cylinder 11 can be formed as a unitary structure up to -the guide portion 13. In this case, the operation efEiciency can be further increased -to reduce the manufacturing cost.
In carrying out the assembling operation, the engaging projection 112 of the cushion sleeve is reliably and simply brought into engagement with the stopper hole lla of the outer cylinder 11 since the sleeve guide groove 113 has been formed in the inner wall of the outer cylinder 11.
Owing to this engagement, furthermore, position of the cushion sleeve 19 is not deviated.
In the propelling pencil which is completely assembled as mentioned above, not only the spring 18 for knocking but also the cushion portion 111 having a small modulus of elasticity work to absorb excessive writing pressure, the cushion portion 111 of the cushion sleeve 19 contracts as indicated by a dotted line in Fig. 3 in case an excessively great writing pressure is exerted on the lead 114. That is, the lead 114 retracts into the outer cylinder 11, and is no-t broken.
Fig. 11 shows an engaging portion of the engaging projection 112 according to another embodiment of this invention, in which the engaging projection 112 of the cushion sleeve 19 is brought into engagement with a stepped portion llb in the inner wall instead of the s-topper hole lla.
This embodiment exhibits the same effects as those of the above-mentioned embodiment. In this embodiment, however, the outer cylinder 11 can be produced more simply since there is no need of forming the stopper hole lla and the sleeve guide groove 113.
In the case of this embodiment, however, it is desired that the tip fitting 12 ana the guide portion 13 of Fig. 2 are formed separately from the outer cylinder 11.
According to this invention as mentioned above, the sleeve has a spring function for absorbing excessively great writing pressure. Furthermore, the assembling efficiency can be increased strikingly, and -the number of par-ts can be reduced to remarkably decrease the manufacturing cost.
Fig. 12 is a vertical section view showing tip portions of the propelling pencil according to s-till another embodiment of this invention. As compared with the propelling pencil of the embodiment in Fig. 2, that of Fig. 12 is provided with an outer cylinder 11 united with the tip fitting 13' and a lead guide portion 13a'.
This structure makes it easier to automatically assemble the propelling pencils.
Figs. 13 and 14 are a perspective view showing a knock-type propelling pencil according to the o-ther embodiment of this invention in a disassembled manner, and a section view illustrating major portions thereof, in which reference numeral 21 denotes an outer cylinder composed of a synthetic resin of a good quality, which is molded as a unitary structure and which will be gripped by a person who writes. The outer cylinder 21 has a core guide hole 21a in a tip portion thereof and an engaging hole 21b in the outer peripheral portion thereoE.
In the outer cylinder 21 is placed a cup-shaped resilient engaging member 22 whlch has, on the peripheral rear end portion thereof, a tapered protrusion 22b that engages with said engaging hole 21b, and an inner flange 22a g d~9t7 at an end portion thereof. In the engaging member 22 is slidably inserted a lead pipe 23. A chuck-fastening tube 25 has been fitted to a chuck portion 24a at the end of a lead chuck 24 that is attached to an end 23a of -the lead pipe 23.
A spring 26 is interposed between the inner flange 22a and -the end 23a of the lead pipe 23, and so urges the lead chuck 24 that the chuck portion 24a is squeezed by the chuck-fastening tube 25.
Further, the engaging member 22 and the lead chuck 24 may be assembled together as a unitary structure, the lead chuck 24 being provided with a lead pipe 23 with a chuck-fastening tube 25 being fitted thereto via a spring.
The above assembly is inserted in the ou-ter cylinder 21 from -the side of the rear end overcoming the resilient force of the tapered protrusion 22b which will then engage with the engaging hole 2lb.
According to this invention as mentioned above, the assembly is incorporated into -the outer cylinder 21 by
2~ simply driving it from the rear side in such a manner that the tapered protrusion 22b will engage with the engaging hole 21b. To disassemble the device, the tapered protrusion 22b protruded through the engaging hole 21b should simply be pushed by a pin or the like, and the assembly should be pulled rearwards.
The lead in the knock-type propelliag pencil can be propelled in the same manner as the conventional propelling operation. That is, the engaging member 22 has been detachably attached to the outer cylinder 21.
Therefore, when the lead pipe 23 is knocked from the rear direc-tion, the lead chuck 24 holding -the lead is pushed forward to liberate the chuck-fastening tube 25 which is fitted to the chuck 24a, whereby the lead is ]iberated.
When the knocking operation is discontinued, the spring 26 so urges the lead chuck 24 that the core is held again. By repeating this operation, the lead is propelled through the lead guide hole 21a.
In the above-mentioned embodiment, a tapered protrusion which works as a resilient piece is formed on the outer periphery of the cup-shaped engaging member 22. The tapered protrusions, however, may be provided in a plurality of numbers at symmetrical positions on the outer periphery.
When a plurality of tapered projections are provided as mentioned above, a plurality of engaging holes should be formed in the outer cylinder 1 correspondingly.
Further, as a modified example of the engaging member, a plurality of slits may be formed in the outer peripheral portion of the cup-shaped engaging member to impart resiliency, and the tapered protrusions may be formed at the outer peripheral rear ends.
According to the knock-type propelling pencil of this invention as mentioned above, the outer cylinder is composed of a synthetic resin ~hich can be easily molded as a unitary structure, and the engaging member incorporating the chuck device whlch includes a lead-propelling mechanism, is detachably inserted into the outer cylinder from the rear side thereof. ~herefore, the pencil can be simply constructed, and manufactured at a reduced cost. In order to further reduce the number of parts, the chuck-fastening tube and the engaging member may be molded as a unitary structure.
The lead in the knock-type propelliag pencil can be propelled in the same manner as the conventional propelling operation. That is, the engaging member 22 has been detachably attached to the outer cylinder 21.
Therefore, when the lead pipe 23 is knocked from the rear direc-tion, the lead chuck 24 holding -the lead is pushed forward to liberate the chuck-fastening tube 25 which is fitted to the chuck 24a, whereby the lead is ]iberated.
When the knocking operation is discontinued, the spring 26 so urges the lead chuck 24 that the core is held again. By repeating this operation, the lead is propelled through the lead guide hole 21a.
In the above-mentioned embodiment, a tapered protrusion which works as a resilient piece is formed on the outer periphery of the cup-shaped engaging member 22. The tapered protrusions, however, may be provided in a plurality of numbers at symmetrical positions on the outer periphery.
When a plurality of tapered projections are provided as mentioned above, a plurality of engaging holes should be formed in the outer cylinder 1 correspondingly.
Further, as a modified example of the engaging member, a plurality of slits may be formed in the outer peripheral portion of the cup-shaped engaging member to impart resiliency, and the tapered protrusions may be formed at the outer peripheral rear ends.
According to the knock-type propelling pencil of this invention as mentioned above, the outer cylinder is composed of a synthetic resin ~hich can be easily molded as a unitary structure, and the engaging member incorporating the chuck device whlch includes a lead-propelling mechanism, is detachably inserted into the outer cylinder from the rear side thereof. ~herefore, the pencil can be simply constructed, and manufactured at a reduced cost. In order to further reduce the number of parts, the chuck-fastening tube and the engaging member may be molded as a unitary structure.
Claims (2)
1. A propelling pencil comprising:
an outer cylinder composed of a synthetic resin molded as a unitary structure which will be gripped during the writing and which has at least one engaging hole formed in the periphery on the front side thereof;
a resilient engaging member which has, on the outer peripheral rear portion, at least one protrusion that engages with said engaging hole, and which has an inner flange at the front end thereof;
a lead chuck which is slidably inserted in the engaging member, and which is attached to an end of a lead pipe;
a chuck-fastening tube loosely fitted to a chuck portion at the end of the lead chuck; and a spring which is disposed between said inner flange and one end of said lead pipe, and which so urges the lead chuck that the chuck portion is squeezed by the chuck-fastening tube.
an outer cylinder composed of a synthetic resin molded as a unitary structure which will be gripped during the writing and which has at least one engaging hole formed in the periphery on the front side thereof;
a resilient engaging member which has, on the outer peripheral rear portion, at least one protrusion that engages with said engaging hole, and which has an inner flange at the front end thereof;
a lead chuck which is slidably inserted in the engaging member, and which is attached to an end of a lead pipe;
a chuck-fastening tube loosely fitted to a chuck portion at the end of the lead chuck; and a spring which is disposed between said inner flange and one end of said lead pipe, and which so urges the lead chuck that the chuck portion is squeezed by the chuck-fastening tube.
2. A propelling pencil as claimed in claim 1, wherein said protrusion of said resilient engaging member is provided with a tapered portion and said engaging hole is a through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000468367A CA1201997A (en) | 1982-05-10 | 1984-11-21 | Propelling pencil |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP67850/1982 | 1982-05-10 | ||
| JP1982067850U JPS58171392U (en) | 1982-05-10 | 1982-05-10 | Shape pencil |
| CA000410839A CA1197811A (en) | 1982-05-10 | 1982-08-25 | Propelling pencil |
| CA000468367A CA1201997A (en) | 1982-05-10 | 1984-11-21 | Propelling pencil |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000410839A Division CA1197811A (en) | 1982-05-10 | 1982-08-25 | Propelling pencil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1201997A true CA1201997A (en) | 1986-03-18 |
Family
ID=25669804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000468367A Expired CA1201997A (en) | 1982-05-10 | 1984-11-21 | Propelling pencil |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1201997A (en) |
-
1984
- 1984-11-21 CA CA000468367A patent/CA1201997A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |