SWING-TYPE MECHANICAL PENCIL

Abstract: The present invention relates to a swing-type mechanical pencil wherein lead can be sent out from a head member which is connected with an outer sleeve by moving a knocking hammer with swinging an outer sleeve, applying force to a lead-feeding mechanism with the knocking hammer so that the lead-feeding mechanism can be acted. A chuck-shutting hammer (11) is mounted between a spring bearing (9) of a chuck ring sleeve (8) retaining a chuck ring (7) which is a component of said lead holder (2) and a second spring (10) which is connected with said chuck (4). The upward movement of the chuck-shutting hammer (11) make the chuck (4) compulsorily insert in the chuck ring (7). Therefore as the chuck can be positively shut, sliding of lead does not occur and writing in mechanical pencil can positively performed.

Description: Field of the invention This invention relates to a mechanical pencil wherein lead can be sent out by a given length from a head member which is connected with an outer sleeve by swinging the outer sleeve. Particularly, the present invention relates to a swing-type mechanical pencil having an outer sleeve containing a lead feeder, a lead case containing lead in said lead feeder, a knocking hammer for knocking on said feeder to extend lead out of the head end of said outer sleeve. Background of the invention In a usual swing-type mechanical pencil, a knocking hammer 2 can be reciprocated (moved up and down) in the axial direction by swinging an outer sleeve 1 and knocking a lead case 5 of a lead-feeding mechanism 3 with the knocking hammer so that a chuck 19 which is inserted in a chuck ring 18 retained on the forward portion of the chuck ring bearing sleeve 17, and which is set to the forward end portion of the lead case 5 can be moved against the spring force of a chuck-clamping spring 20 or with the spring force thereof by the above-mentioned knocking, so that the chuck can be openened or shut, and thereby lead can be fed by a given length from the chuck 19, and be sent out from a head pipe 23 of a slider 22 in the forward end portion of the head member 21 which is attached to the outer sleeve 1. Further, lead 4 can be drawn together with the head pipe 23 in the head member 21 by pushing the end of lead with maintaining the opened state of the chuck 19, as well as it is possible to send out a lead by pushing the lead case 5 with knocking the rear end. However, in a the above-mentioned usual instance, without saying that a retaining part for restraining the knocking hammer 2 from moving upward is needed besides a projecting part 24 serving also as a bearing of the spring 20 at the outer surface of the lead case 5, in order that the lead case 5 is knocked with the knocking hammer 2 moving upward, there is a problem that an unexpected sending-out of lead is performed by the upward and downward movement of the outer sleeve caused by that the mechanical pencil is vibrated at the time of carrying the mechanical pencil with one. In another usual swing-type mechanical pencil, a knocking hammer 2 can be reciprocated (moved up and down) in the axial direction by swinging an outer sleeve 1 and knocking a lead case 5 of a lead-feeding mechanism 3 with the knocking hammer so that a chuck 19 which is inserted in a chuck ring 18 retained on the forward portion of the chuck ring bearing sleeve 17, and which is set to the forward end portion of the lead case 5 can be moved against the spring force of a chuck-clamping spring 20 or with the spring force thereof by the above-mentioned knocking, so that the chuck can be openened or shut, and thereby lead can be fed by a given length from the chuck 19, and be sent out from a head pipe 23 of a slider 22 in the forward end portion of the head member 21 which is attached to the outer sleeve 1. Further, lead 4 can be drawn together with the head pipe 23 in the head member 21 by pushing the end of lead with maintaining the opened state of the chuck 19, as well as it is possible to send out a lead by pushing the lead case 5 with knocking the rear end. However, in the above-mentioned usual instance, there is a problem that lead can be positively held, as it does not have the construction that the upward movement of the hammer 2 makes the lead case 5 move up so as to compulsorily shut the chuck 19. Further, as the lead case 5 is knocked by the upward and downward movement of the knocking hammer, there is the other problem that an expected sending- out lead is performed by the upward and downward movement of the outer sleeve caused by that the mechanical pencil is vibrated at the time of carrying the mechanical pencil with one. Such a swing-type mechanical pencil is described in US-Patent 4, 205,924 which shows a lead-feeding mechanism comprising a lead reservoir, a connector, and a chuck being held by a front spring in a normal rear position, at which the chuck is clamping a lead piece, but when a forward shake is imparted to the pencil, a weight collides forwardly with the lead-feeding mechanism and pushes the same forward, counter to the force of the spring, whereupon the chuck feeds the lead piece through a specific distance then releases the same, the lead-feeding mechanism being subsequently returned by the spring to the normal position, where the chuck again clamps the lead piece at a new position thereof. However this pencil shows the same disadvantages and problems as mentioned above. Brief description of the Invention This invention intends to eliminate said drawbacks, and an object of this invention is to provide a mechanical pencil wherein a lead holder is mounted in an outer sleeve, a knocking hammer is moved up and down by swinging said outer sleeve, a chuck which is a component of said lead holder is opened or shut against a chuck-clamping spring or with the force of said spring by moving up and down said knocking hammer so that lead can be sent out by a given length from a head member which is connected with said outer sleeve , according to the present device a chuck-shutting hammer is mounted between a spring bearing of a chuck ring sleeve retaining a chuck ring which is a component of said lead holder and a second spring which is connected with said chuck. As the outer sleeve is swung up and down, the knocking hammer is moved up and down. The upward or downward movement of the knocking hammer makes the chuck which a component of the lead holder open or shut against the chuck-clamping spring or with the force of said spring through the spring bearing which is connected with the chuck . When the chuck returns (moves upwards) by the action of the spring force of the chuck-clamping spring , a chuck-shutting hammer is moved up so as to knock the spring bearing , and makes the chuck which is connected with the spring bearing compulsorily move up in association with the spring force of the chuck-clamping force so that the chuck can be compulsorily inserted in the chuck ring whereby the shutting operation of the chuck can be sufficiently performed so that lead can be firmly snapped by the chuck . Therefore, as sliding of lead does not occurs at the time of writing in mechanical pencil, writing in mechanical pencil can positively perform. As above-mentioned, as the chuck-shutting hammer is mounted between the spring bearing of the chuck ring sleeve retaining the chuck ring which is a component of the lead holder and the second spring bearing which is connected with the chuck according to the device, the chuck-shutting hammer is moved up or down, simultaneously with the upward and downward movement of the knocking hammer . However, the upward movement of the chuck-shutting hammer make the chuck compulsorily insert in the chuck ring . Therefore as the chuck can be positively shut sliding of lead does not occur and writing in mechanical pencil can positively performed. The other object of this invention is to provide a swing-type mechanical pencil compises a lead-feeding mechanism which is composed of a chuck inserted in a lead pipe, chuck ring put on said chuck , a chuck ring bearing sleeve retaining said chuck ring , and a chuck-clamping elastic body inserted between said sleeve and a receiving part provided on the lead pipe, said sleeve being attached to a head member to be connected with an outer sleeve and said lead-feeding mechanism being inserted in the outer sleeve , and also a knocking hammer being inserted between said receiving part and a knocking part attached to the lead pipe . When the outer sleeve is swung up and down, the knocking hammer is reciprocated between the receiving part which is provided on the lead pipe and the knocking part which is attached to the lead pipe . The reciprocating movement of the knocking hammer knocks the receiving part , and makes the chuck which is inserted in the chuck ring move against the elasticity of the chuck-clamping elastic body or with the elasticity thereof, so that the chuck can be opened or shut, and thereby lead can be sent out by a given length from the head member . When lead is drawn in, the knocking part is pushed. The movement of the knocking part makes the chuck move forward against the elasticity of the chuck-clamping elastic body so that the chuck can be opened. Drawing-in of lead can be performed by pushing the tip of lead with maintaining the open state. As above-mentioned, according to the present device, the travelling scope of the knocking hammer can be determined with the receiving part and the knocking part serving also as the receiving part or the receiving part . Therefore, number of necessary parts can be reduced to one part or two parts, thus the construction being simple, assembly being easy, and low-priced. The another object of this invention is to provide a swing-type mechanical pencil wherein lead can be sent out from a head of an outer sleeve by swinging an outer sleeve so that a knocking hammer acts on a lead-feeding mechanism , according to the present device, a lead case bearing is connected to the rear end portion of a lead case of the lead-feeding mecanism , a hole is provided in a side portion of the lead case bearing while an axial slit is provided in the area of the outer sleeve facing said hole , a long hole in which a slider can slide is formed in a part of the outer sleeve enclosing the slit , and also the slit is formed with a neck portion which makes the projecting part travel step by step when the projecting part of the slider is inserted in the hole through the slit and the slider is slided backward. When the outer sleeve 1is swung , the knocking hammer moves up and down so as to act on the lead-feeding mechanisms . As a result of the knocking hammer knocking the lead case , lead can be sent out from the head of the outer sleeve . In this case, the projecting part of the slider is inserted in the hole formed in the lead case bearing , and the slider is retained in the neck portion which is provided in the outer sleeve , resulting in restraining the hammer from moving upward. Further, when the slider is moved forward and backward along the slit , lead can be sent from the head of the outer sleeve by pushing the lead case of the lead-feeding mechanism through the lead case bearing with the forward and backward movement of the slider in the same manner as the known mechanical pencil, since the projecting part of the slider is inserterd in the hole of the lead case bearing . In order to draw lead in, the lead case is pushed through the lead case bearing in which hole the projecting part of the slider is inserted, by moving forward so that the chuck of the lead-feeding mechanism can kept in the opened state thereof, and lead can be drawn in the head of the outer sleeve by pushing the tip of lead with keeping the opened state in the same manner as the known mechanical pencil. At the time of carrying the mechanical pencil with one, the projecting part on of the slider is inserted between the neck portion and the rear end of the slit by pushing backward the slider and compulsorily passing through the neck portion which is provided in slit so that the slider is locked, and thereby the lead case bearing in which hole the projecting part of the slider is inserted and the lead case connected thereto are locked with locking the slider . Therefore, though the upward and downward movement of the outer sleeve makes the knocking hammer move up and down, the lead-feeding action by the lead-feeding mechanism cannot be performed. As being clear from the above-explanation, according to the device, the upward movement of the knocking hammer can be restrained without using of an other retaining part for restraining of the upward movement, and besides, particularly at the time of carrying the mechanical pencil with one, the projecting part of the slider is inserted between the neck portion and the rear end of the slit by pushing backward the slider and compulsorily passing through the neck portion which is provided in the slit so that the slider is locked, and thereby the lead xase bearing in which hole the projecting part of the slider is inserted and the lead case connected thereto are locked with locking the slider . Terefore, though the upward and downward movement of the outer sleeve makes the knocking hammer move up and down, the lead-feeding action by the lead-feeding mechanism cannot be performed. The still another object of this invention is to provide a swing-type mechanical pencil wherein lead can be sent out from a head of an outer sleeve by swinging an outer sleeve so that a knocking hammer acts on a lead-feeding mechanism , according to the device, an axial slit on the case side , a struck part to be struck by the knocking hammer and a clinching part behind said struck part are provided at the rear portion of a lead case of the lead-feeding mechanism and a lead case bearing having a projection inside said lead case bearing is connected to the rear portion of the lead case between said struck part and said clinching part at the rear portion of the lead case, a hole is provided in a side portion of the lead case bearing while an axial slit on the the outer sleeve side is provided in the area of the outer sleeve facing said hole , a long hole in which a slider can slide is formed in a part of the outer sleeve enclosing the slit on the outer sleeve side , and a projecting part on of the slider is inserted in the hole through the slit on the outer sleeve . When the outer sleeve is swung, the kncking hammer moves up and down to act on the lead-feeding mechanism which lead case is knocked so that lead can be sent from the head of the outer sleeve. When the struck part is struck by the upwards moving knocking hammer whereby the lead case is upwards moved slightly till the slider the projecting part of which is inserted in the hole of the lead case bearing which is connected to the lead case . As the result, the chuck is cmpulsorily inserted and shut. Therefore, lead is positively chucked by the chuck , thus lead being prevented from sliding. Further, when the slider is moved forward and backward along the slit on the outer sleeve side , lead can be sent from the head of the outer sleeve by pushing the lead case of the lead-feeding mechanism through the lead case bearing with the forward and backward movement of the slider in the same manner as the known mechanical pencil, since the projecting part of the slider is inserterd in the hole of the lead case bearing . In order to draw lead in, the lead case is pushed through the lead case bearing in which hole the projecting part of the slider is inserted, by moving forward so that the chuck of the lead-feeding mechanism can kept in the opened state thereof, and lead can be drawn in the head of the outer sleeve by pushing the tip of lead with keeping the opened state in the same manner as the known mechanical pencil. At the time of carrying the mechanical pencil with one, the projecting part on of the slider is inserted between a neck portion which is provided in slit on the outer sleeve side and the rear end of the slit , by pushing backward the slider and with compulsorily passing through the neck portion and so that the slider is locked, and thereby the lead case bearing in which hole the projecting part of the slider is inserted and the lead case connected there to are locked with locking the slider Therefore, though the upward and downward movement of the outer sleeve makes the knocking hammer move up and down, the lead-feeding action by the lead-feeding mechanism cannot be performed. As being clear from the above-explanation, according to the device, the struck part is knocked by upwards moving knocking hammer so that the lead case is a little moved upwards till the slider which projecting part is inserted in the hole of the lead case bearing connected to the lead case is retained. As the result the chuck is compulsorily inserted in the chuck ring and shut, which results in positively chucking lead and preventing lead from sliding in writing, and besides, particularly at the time of carrying the mechanical pencil with one, the projecting part of the slider is inserted between the neck portion and the rear end of the slit on the outer sleeve side by pushing backward the slider and compulsorily passing through the neck portion which is provided in the slit on the outer sleeve side so that the slider is locked, and thereby the lead case bearing in which hole the projecting part of the slider is inserted and the lead case connected thereto are locked with locking of the slider . Terefore, though the upward and downward movement of the outer sleeve makes the knocking hammer move up and down, the lead-feeding action by the lead-feeding mechanism cannot be performed. The above and other objects, advantages and novel features of this invention will be more understood from the following detailed description and the accompanying drawings, in which like reference numbers indicate like or similar parts throughout wherein; Brief Description of the Drawings Figure 1 is a longitudinal sectional view showing the first embodiment of a swing-type mechanical pencil, Figure 2 is a side view showing an instance of an outer sleeve of the first embodiment, Figure 3 is a side view showing an instance of the lead case bearing of the first embodiment, Figure 4 is a side view showing a second embodiment of the lead case bearing, Figures 5 (a) (b) are a longitidinal sectional view and a side view of a second embodiment of a swing-type mechanical pencil of this invention, respectively, Figures 6 (a) (b) are a side view and a sectional view taken on line X - X of an instance of an outer sleeve of the second embodiment in the present invention, respectively, Figures 7 (a) (b) are sectional views taken on line XIa - XIa and line XIb - XIb of Figure 6 (b), respectively, Figure 8 is a longitudinal sectional view of the lead case in the present invention, Figures 9 (a) (b) are a sectional view taken on line XIIIa - XIIIa and a view taken on line XIIIb - XIIIb of Figure 8, respectively, Figures 10 (a)-(c) are a sectional view taken on line XIVb - XIVb of Figure 10 (a) and a sectional view taken on line XIVc - XIVc of Figure 10 (b) of the lead case bearing, respectively, Figures 11 (a)-(c) are a side view, bottom view, a sectional view taken on XVc - XVc and a view taken on line XVd - XVd of Figure 11 (a), respectively, Figure 12 is a front elevation of the chuck ring bearing sleeve in a further embodiment of the present invention. Detailed Description of the Invention Referring now to the drawings, embodiments according to the present invention will be described. Referring to Figure 1, in a usual swing-type mechanical pencil, a knocking hammer 2 can be reciprocated (moved up and down) in the axial direction by swinging an outer sleeve 1 and knocking a lead case 5 of a lead-feeding mechanism 3 with the knocking hammer so that a chuck 19 which is inserted in a chuck ring 18 retained on the forward portion of the chuck ring bearing sleeve 17, and which is set to the forward end portion of the lead case 5 can be moved against the spring force of a chuck-clamping spring 20 or with the spring force thereof by the above-mentioned knocking, so that the chuck can be openened or shut, and thereby lead can be fed by a given length from the chuck 19, and be sent out from a head pipe 23 of a slider 22 in the forward end portion of the head member 21 which is attached to the outer sleeve 1. Further, lead 4 can be drawn together with the head pipe 23 in the head member 21 by pushing the end of lead with maintaining the opened state of the chuck 19, as well as it is possible to send out a lead by pushing the lead case 5 with knocking the rear end. However, in a the above-mentioned instance, without saying that a retaining part for restraining the knocking hammer 2 from moving upward is needed besides a projecting part 24 serving also as a bearing of the spring 20 at the outer surface of the lead case 5, in order that the lead case 5 is knocked with the knocking hammer 2 moving upward, there is a problem that an unexpected sending-out of lead is performed by the upward and downward movement of the outer sleeve caused by that the mechanical pencil is vibrated at the time of carrying the mechanical pencil with one. Referring to Figure 5 in a usual swing type mechanical pencil, a knocking hammer 2 can be reciprocated (moved up and down) in the axial direction by swinging an outer sleeve 1 and knocking a lead case 5 of a lead-feeding mechanism 3 with the knocking hammer so that a chuck 19 which is inserted in a chuck ring 18 retained on the forward portion of the chuck ring bearing sleeve 17, and which is set to the forward end portion of the lead case 5 can be moved against the spring force of a chuck-clamping spring 20 or with the spring force thereof by the above-mentioned knocking, so that the chuck can be openened or shut, and thereby lead can be fed by a given length from the chuck 19, and be sent out from a head pipe 23 of a slider 22 in the forward end portion of the head member 21 which is attached to the outer sleeve 1. Further, lead 4 can be drawn together with the head pipe 23 in the head member 21 by pushing the end of lead with maintaining the opened state of the chuck 19, as well as it is possible to send out a lead by pushing the lead case 5 with knocking the rear end. However, in the above-mentioned instance, there is a problem that lead can be positively held, as it does not have the construction that the upward movement of the hammer 2 makes the lead case 5 move up so as to compulsorily shut the chuck 19. Further, as the lead case 5 is knocked by the upward and downward movement of the knocking hammer, there is the other problem that am expected sending- out lead is performed by the upward and downward movement of the outer sleeve caused by that the mechanical pencil is vibrated at the time of carrying the mechanical pencil with one. This invention intends to eliminate said drawbacks. Another object of this invention is to provide a swing-type mechanical pencil wherein lead 4 can be sent out from a head of an outer sleeve 1 by swinging an outer sleeve 1 so that a knocking hammer 2 acts on a lead-feeding mechanism 3 , according to the device of Figure 1, a lead case bearing 6 is connected to the rear end portion of a lead case 5 of the lead-feeding mecanism 3 , a hole 7 is provided in a side portion of the lead case bearing 6 while an axial slit 8 is provided in the area of the outer sleeve facing said hole 7 , a long hole 10 in which a slider 9 can slide is formed in a part of the outer sleeve 1 enclosing the slit 8 , and also the slit 8 is formed with a neck portion 12 which makes the projecting part 11 travel step by step when the projecting part 11 of the slider 9 is inserted in the hole 7 , through the slit 8 and the slider 9 is slided backward. When the outer sleeve 1 is swung, the knocking hammer 2 moves up and down so as to act on the lead-feeding mechanisms 3 . As a result of the knocking hammer 2 knocking the lead case 5 , lead 4 can be sent out from the head of the outer sleeve 1 . In this case, the projecting part 11 of the slider 9 is inserted in the hole 7 formed in the lead case bearing 6 , and the slider 9 is retained in the neck portion 12 which is provided in the outer sleeve 1 , resulting in restraining the hammer from moving upward. Further, when the slider 9 is moved forward and backward along the slit 8, lead 4 can be sent from the head of the outer sleeve 1 by pushing the lead case 5 of the lead -feeding mechanism 3 through the lead case bearing 6 with the forward and backward movement of the slider 9 in the same manner as the known mechanical pencil, since the projecting part 11 of the slider 9 is inserterd in the hole 7 of the lead case bearing 6. In order to draw lead 4 in, the lead case 5 is pushed through the lead case bearing 6 in which hole 7 the projecting part 11 of the slider 9 is inserted, by moving forward so that the chuck 19 of the lead-feeding mechanism 3 can kept in the opened state thereof, and lead can be drawn in the head of the outer sleeve 1 by pushing the tip of lead with keeping the opened state in the same manner as the known mechanical pencil. At the time of carrying the mechanical pencil with one, the projecting part on 11 of the slider 9 is inserted between the neck portion 12 and the rear end of the slit 8 by pushing backward the slider 9 and compulsorily passing through the neck portion 12 which is provided in slit 8 so that the slider is locked, and thereby the lead case bearing 6 in which hole 7 the projecting part 11 of the slider 9 is inserted and the lead case 5 connected thereto are locked with locking the slider 9. Therefore, though the upward and downward movement of the outer sleeve 1 makes the knocking hammer 2 move up and down, the lead-feeding action by the lead-feeding mechanism 3 cannot be performed. As being clear from the above-explanation, according to the device, the upward movement of the knocking hammer 2 can be restrained without using of an other retaining part for restraining of the upward movement, and besides, particularly at the time of carrying the mechanical pencil with one, the projecting part 11 of the slider 9 is inserted between the neck portion 12 and the rear end of the slit 8 by pushing backward the slider 9 and compulsorily passing through the neck portion 12 which is provided in the slit 8 so that the slider is locked, and thereby the lead case bearing 6 in which hole 7 the projecting part 11 of the slider 9 is inserted and the lead case 5 connected thereto are locked with locking the slider 9. Terefore, though the upward and downward movement of the outer sleeve 1 makes the knocking hammer 2 move up and down, the lead-feeding action by the lead-feeding mechanism 3 cannot be performed Another object of this invention according to Figure 5 is to provide a swing-type mechanical pencil wherein lead 304 can be sent out from a head of the outer sleeve 301 by swinging the outer sleeve 301 so that the knocking hammer 302 acts on a lead-feeding mechanism 303, according to the device, an axial slit on the case side 306, a struck part 307 to be struck by the knocking hammer 302 and a clinching part 308 behind said struck part 307 are provided it the rear portion of a lead case 305 of the lead-feeding mechanism 303 and a lead base bearing 310 having a projection 309 inside said lead case bearing is connected to the rear portion of the lead case 305 between said struck part 307 and said clinching part 308 at the rear portion of the lead case, a hole 311 is provided in a side portion of the lead case bearing 310 while an axial slit on the the outer sleeve side , 12 is provided in the area of the outer sleeve facing said hole 311, a long hole 314 in which a slider 313 can slide is formed in a part of the outer sleeve 301 enclosing the slit on the outer sleeve side 312, and a projecting part on 315 of the slider 313 is inserted in the hole 311 through the slit on the outer sleeve 312. When the outer sleeve 301 is swung, the kncking hammer 302 moves up and down to act on the lead-feeding mechanism which lead case is knocked so that lead 304 can be sent from the head of the outer sleeve. When the struck part 307 is struck by the upwards moving knocking hammer 302 whereby the lead case is upwards moved slightly till the slider 313 the projecting part 315 of which is inserted in the hole 311 of the lead case bearing 310 which is connected to the lead case 305. As the result, the chuck 319 is compulsorily inserted and shut. Therefore, lead 304 is positively chucked by the chuck 319, thus lead being prevented from sliding. Further, when the slider 313 is moved forward and backward along the slit on the outer sleeve side 312, lead 304 can be sent from the head of the outer sleeve 301 by pushing the lead case 305 of the lead-feeding mechanism 303 through the lead case bearing 310 with the forward and backward movement of the slider 313 in the same manner as the known mechanical pencil, since the projecting part 315 of the slider 313 is inserterd in the hole 311 of the lead case bearing 310. In order to draw lead 304 in, the lead case 305 is pushed through the lead case bearing 310 in which hole the projecting part 315 of the slider 313 is inserted, by moving forward so that the chuck 319 of the lead-feeding mechanism 303 can kept in the opened state thereof, and lead 304 can be drawn in the head of the outer sleeve 301 by pushing the tip of lead with keeping the opened state in the same manner as the known mechanical pencil. At the time of carrying the mechanical pencil with one, the projecting part on 315 of the slider 313 is inserted between a neck portion 312a which is provided in slit on the outer sleeve side 312 and the rear end of the slit 312, by pushing backward the slider 313 and with compulsorily passing through the neck portion 312a and so that the slider 313 is locked, and thereby the lead case bearing 310 In which hole 311 the projecting part 315 of the slider 313 is inserted and the lead case 305 connected thereto are locked with locking the slider 313. Therefore, though the upward and downward movement of the outer sleeve 301 makes the knocking hammer 302 move up and down, the lead-feeding action by the lead-feeding mechanism 303 cannot be performed. As being clear from the above-explanation, according to the device, the struck part 307 is knocked by upwards moving knocking hammer 302 so that the lead case 305 is a little moved upwards till the slider 313 which projecting part 315 is inserted in the hole 311 of the lead case bearing 310 connected to the lead case 305 is retained. As the result , the chuck 319 is compulsorily inserted in the chuck ring 318 and shut, which results in positively chucking lead 304 and preventing lead from sliding in writing, and besides, particularly at the time of carrying the mechanical pencil with one, the projecting part 315 of the slider 313 is inserted between the neck portion 312a and the rear end of the slit on the outer sleeve side 312 by pushing backward the slider 313 and compulsorily passing through the neck portion 312a which is provided in the slit on the outer sleeve side 312 so that the slider 313 is locked, and thereby the lead case bearing 310 in which hole 311 the projecting part 315 of the slider 313 is inserted and the lead case 305 connected thereto are locked with locking of the slider 313. Terefore, though the upward and downward movement of the outer sleeve 301 makes the knocking hammer 302 move up and down, the lead-feeding action by the lead-feeding mechanism 303 cannot be performed. In Figure 1 numeral 1 designates the outer sleeve, numeral 21 the head which is screwed in the outer sleeve, numeral 22 the slider which is screwed in the head 21 on its top side, and which head pipe 23 appears and disappear out of the head 22. Numeral 3 designates the lead-feeding mechanism which is inserted the outer sleeve 1 for sending out lead 4 out of the head pipe 23. This lead-feeding mechanism 3 comprises the lead case 5, the chuck 19 fixed to the forward portion of the lead case 5 , the chuck ring 18 inserted in the chuck 19, the chuck ring bearing sleeve 17 which is brought into contact with the rear end of the chuck ring 18 and which is retained to the head 21, the chuck-clamping spring 20 inserted between the rear end portion of said sleeve 17 and a portion 24 used as a spring bearing of the lead case 5 and a projecting part. The forward and rearward sides of the chuck ring bearing sleeve 17 are connected to the head member through a buffer part(not drawn). Numeral 6 designates the lead case bearing, which is connected to the lead case 5 so that a that the lead case bearing 6 can displace in the axial direction by the projecting part 26 which is provided at the forward inner surface of the lead case bearing 6 and a clinching part 27 which is provided at the backward outer surface of the lead case 5. A hole 7 is provided in a side potion of the lead case 6(refer to Figure 3), while a axial slit 8 is provided in the area of the outer sleeve facing said hole 7. The knocking hammer 2 is put on the lead case 5 between the lead case bearing 6 and a portion 24 used as a spring bearing 6 of the lead case and a projecting part. A long hole 10 in which a slider 9 can slide is formed in a part of the outer sleeve 1 enclosing the slit 8. A projecting part 11 is inserted in the hole 7 through the slit 8. The slit 8 is formed with a neck portion 12 which makes the projecting part 11 travel travel step by step, as the slider 9 is slided backward(refer to Figure 2). The projecting part 11 of the slider 9 is inserted between the neck portion 12 and the rear end of the slit 8 in the above-mentioned sliding operation so that the slider can be locked. Numeral 28 designates a control which is provided on the slider 9. An eraser holder 15 is screwed in the rear portion of the outer sleeve. A spring 16 is inserted between the eraser holder 15 and the lead case bearing 6. Numeral 25 designates an eraser held in the eraser holder 15, and numeral 29 designates a cap. In the above-mentioned construction, when the outer sleeve 1 is swung, the knocking hammer 2 is moved up and down between the portion 24 used as a spring bearing and projecting part. The lead case 5 of the lead-feeding mechanism 3 is knocked by the knocking hammer 2 which moves downward. This knocking makes the chuck 19, which is inserted in the chuck ring 18 retained in the forward portion of the chuck ring bearing sleeve 17 and which is held at the forward end potion of the lead case 5, move against the spring force of the the chuck-clamping spring 20 or with the spring force thereof and thereby opened or shut so that lead 4 can be sent out by a given length from the head pipe 23 of the slider 22 in the forward end portion of the head 21 which is attached to the outer sleeve 1. In this case, since the projecting part 11 of the slider 9 is inserted in the hole 7 formed in the lead case bearing 6 connected with the lead case 5 and the slider 9 is retained in the neck portion 12, the upward movement of the knocking hammer 2 can be restrained. Further, when the slider 9 is moved forward and backward along the slit 8, lead 4 can be sent from the head pipe 23 by pushing the lead case 5 of the lead-feeding mechanism 3 through the lead case bearing 6 with the forward and backward movement of the slider 9 as above-mentioned way, since the projecting part 11 of the slider 9 is inserted in the hole 7 of the lead case bearing 6. In order to draw lead 4 in, the lead case 5 is pushed through the lead case bearing 6 in which hole 7 the projecting part 11 of the slider 9 is inserted, by moving forward so that the chuck 19 of the lead-feeding mechanism 3 can be kept in the opened state thereof, and lead can be drawn in the head of the outer sleeve 1 by pushing the tip of lead with keeping the opened state in the same manner as the known mechanichal pencil. At the time of carrying the mechanical pencil with one, the projecting part 11 of the slider 9 is inserted between the neck portion 12 and the rear end of the slit 8 by pushing backward the slider 9 and compulsorily passing through the neck portion 12 which is provided in the slit 8 so that the slider is locked, and thereby the lead case bearing 6 in which hole 7 the projecting part 11 of the slider 9 is inserted and the lead case 5 connected thereto are locked with locking of the slider 9. Terefore, though the upward and downward movement of the outer sleeve 1 makes the knocking hammer 3 move up and down, the lead-feeding action by the lead-feeding mechanism 3 cannot be performed. Further, in the example, since the spring 16 is inserted between the lead case bearing 6 and the eraser holder 15 as shown in Figure 1, the lead case bearing 6 cannot be unsteady, and it goes without saying that erasing can be carried out by eraser 25 after removing the cap 29. Figure 4 is a side view showing a second embodiment of the lead case bearing in which an opened slit 14 reaches to the periphery is formed at the rear portion of the hole 7 of the lead case bearing 6 through a neck portion 13. Therefore, after the head member 21 has been unscrewed from the outer sleeve, by pulling the head member 21, the head member 21, the lead-feeding mechanism attached thereto, and the lead case bearing 6 connected to the lead case of said mechanism 3 can be taken out from the opened slit 14 without breaking down the projecting part 11 of the slider 9, and besides as the projecting part 11 of the slider 9 can be inserted in the hole 7 through the opened slit 14 and the neck portion 13, insertion of the projecting part 11 into the hole 13 can be more easily performed. As being clear from the above-explanation, according to the device, the upward movement of the knocking hammer 2 can be restrained without using of an other retaining part for restraining of the upward movement, and besides, particularly at the time of carrying the mechanical pencil with one, the projecting part 11 of the slider 9 is inserted between the neck portion 12 and the rear end of the slit 8 by pushing backward the slider 9 and compulsorily passing through the neck portion 12 which is provided in the slit 8 so that the slider is locked, and thereby the lead xase bearing 6 in which hole 7 the projecting part 11 of the slider 9 is inserted and the lead case 5 connected thereto are locked with locking the slider 9. Therefore, though the upward and downward movement of the outer sleeve 1 makes the knocking hammer 2 move up and down, the lead-feeding action by the lead-feeding mechanism 3 cannot be performed. Figures 5 (a), (b) are a longitudinal setional view and a side view of another embodiment of a swing- type mechanical pencil according to the invention respectively, and Figures 6 (a) (b) are a side view and a sectional view taken on line X - X of an instance of an outer sleeve in the present invention. In Figure 5, numeral 301 designates the outer sleeve, numeral 321 the head member which is screwed in the outer sleeve 301, numeral 322 the slider which is screwed in the head member 321 on its top side, and which head pipe 323 appears and disappear out of the head member 321. Numeral 303 designates a lead-feeding mechanism which is inserted the outer sleeve 301 for sending out lead 304 out of the head pipe 323. This lead-feeding mechanism 303 comprises a lead case 305, a chuck 319 fixed to the forward portion of the lead case 305, a chuck ring 318 inserted in the chuck 319, a chuck ring bearing sleeve 317 which is brought into contact with the rear end of the chuck ring 318 and which is retained to the head member 321, a chuck-clamping spring 320 inserted between the rear end portion of said sleeve 317 and a portion 324 used as a spring bearing of the lead case 305 and a projecting part and so on. The forward and rearward sides of the chuck ring bearing sleeve 317 are connected to the head member through a buffer part 317a (refer to Figure 12). The lead case 305 is provided at the rear portion thereof with the axial slits on the case side 306 (refer to Figures 8 and 9 ) facing each other and with the struck part 307 (refer to Figures 8, and 9) (a)) facing with each other and with the clinching part 308 (refer Figures 8 and 9 (b)) facing each other, and to the rear portion of the lead case, the lead case bearing 310 (refer Figure 10). which the projection 309 at the inner surface of the forward part between the struck part 307 and the clinching part 308, is connected. The knocking hammer 302 is inserted between the struck part 307 and the portion 324 used as a spring bearing of the lead case and a projection part. A hole 31 1 is provided in a side portion of the backward outer surface of the lead case bearing 310 (refer to Figure 10), while an axial slit on the outer sleeve side facing said hole 311 (refer to Figure 6). A long hole 314 in which a slider 313 can slide is formed in a part of the outer sleeve 301 enclosing the slit on the outer sleeve side 312. The projecting part 315 is inserted in the hole 311 through the slit on outer sleeve side 312. The slit on the outer sleeve 312 is formed with a neck portion 312a which which makes the projecting part 315 travel step by step, as the slider is slid backward (refer to Figures 6 and 7). The projecting part 315 of the slider 313 is inserted between the neck portion 312a and the rear end of the slit 312 in the above-mentioned sliding operation so that the skider can be locked. Numeral 313a designates a control which is provided on the slider 313. Further when the slider 313 is slid backward, the projection 309 of the lead case bearing 310 is brought into contact with the clinching part 308 of the lead case. An eraser jacket 325 is inserted in the rear end portion of the outer sleeve 301. In the eraser jacket 325, an eraser 326 is received. Numeral 327 designates an eraser cover. A spring 316 is inserted between an inner step of the rear portion of the outersleeve 301 and an outer step of the lead case bearing. In the above-mentioned construction, when the outer sleeve 301 is swung, the knocking hammer 302 is moved up and down between the portion 324 used as a spring bearing and projecting part. The lead case 305 of the lead-feeding mechanism 303 is knocked by the knocking hammer 302 which moves downward. This knocking makes the chuck 319, which is inserted in the chuck ring 318 retained in the forward portion of the chuck ring bearing sleeve 317 and which is held at the forward end potion of the lead case 305, move against the spring force of the the chuck-clamping spring 320 or with the spring force thereof and thereby opened or shut so that lead 304 can be sent out by a given length from the head pipe 323 of the slider 322 in the forward end portion of the head member 321 which is attached to the outer sleeve 301. In order that the sending out of lead is smoothly and positively performed with the knocking hammer 302, the spring force of the chuck -clamping spring 320 is weakened. Therefore, said weak spring force makes it impossible for the chuck 319 to be sufficiently inserted in the chuck ring 318 and shut. As the result, thereis the possibility of lead-sliding in writing. In the present device, the struck part 307 is knocked by upwards moving knocking hammer 302 so that the lead case 305 is a little moved upwards till the slider 313 which projecting part 315 is inserted in the hole 311 of the lead case bearing 310 connected to the lead case 305 is retained. As the result, the chuck 319 is compulsorily inserted in the chuck ring 318 and shut, which results in positively chucking lead 304 and preventing lead from sliding in writing. Further, when the slider 313 is moved forward and backward along the slit on the outer sleeve side 312, lead 304 can be sent from the head pipe 323 by pushing the lead case 305 of the lead-feeding mechanism 303 through the lead case bearing 310 with the forward and backward movement of the slider 313 as above-mentioned way, since the projecting part 315 of the slider 313 is inserted in the hole 311 of the lead case bearing 310. In order to draw lead 304 in, the lead case 305 is pushed through the lead case bearing 310 in which hole 311 the projecting part 315 of the slider 313 is inserted, by moving forward so that the chuck 319 of the lead-feeding mechanism 303 can be kept in the opened state thereof, and lead can be drawn in the head of the outer sleeve 301 by pushing the tip of lead with keeping the opened state in the same manner as the known mechanichal pencil. At the time of carrying the mechanical pencil with one, the projecting part 315 of the slider 313 is inserted between the neck portion 312a and the rear end of the slit on the outer sleeve side 312 by pushing backward the slider 313 and compulsorily passing through the neck portion 312a which is provided in the slit on the outer sleeve side 312 so that the slider 313 is locked, and thereby the lead case bearing 310 in which hole 311 the projecting part 315 of the slider 313 is inserted and the lead case 305 connected thereto are locked with locking of the slider 313. Therefore, though the upward and downward movement of the outer sleeve 301 makes the knocking hammer 302 move up and down, the lead-feeding action by the lead-feeding mechanism 303 cannot be performed. Further, in the example, since the spring 316 is inserted between an inner step of the rear portion of the outer sleeve 301 and an outer step of the lead case bearing 310 as shown in Figure 5, the lead case bearing 310 cannot be unsteady, and it goes without saying that erasing can be carried out by eraser 326 after removing the eraser cover 327. Lead can be supplied from the rear end of the outer sleeve 1 by removing the eraser cover 327 and the eraser jacket 325. As being clear from the above-explanation, according to the device, the struck part 307 is knocked by upwards moving knocking hammer 302 so that the lead case 305 is a little moved upwards till the slider 313 which projecting part 315 is inserted in the hole 311 of the lead case bearing 310 connected to the lead case 305 is retained. As the result, the chuck 319 is compulsorily inserted in the chuck ring 318 and shut, which results in positively chucking lead 304 and preventing lead from sliding in writing, and besides, particularly at the time of carrying the mechanical pencil with one, the projecting part 315 of the slider 313 is inserted between the neck portion 312a and the rear end of the slit on the outer sleeve side 312 by pushing backward the slider 313 and compulsorily passing through the neck portion 312a which is provided in the slit on the outer sleeve side 312 so that the slider 313 is locked, and thereby the lead case bearing 310 in which hole 311 the projecting part 315 of the slider 313 is inserted and the lead case 305 connected thereto are locked with locking of the slider 313. Therefore, though the upward and downward movement of the outer sleeve 301 makes the knocking hammer 302 move up and down, the lead-feeding action by the lead-feeding mechanism 303 cannot be performed.

Claims: A swing-type mechanical pencil having an outer sleeve ( 1,301) containing a lead feeder ( 3,303), a lead case ( 5,305) containing lead in said lead feeder ( 3,303) a knocking hammer ( 2,302) for knocking on said feeder ( 3,303) to extend lead ( 4,304) out of the head end ( 21,321) of said outer sleeve ( 1,301) characterized in a lead case bearing ( 6,310) engaging a rearward portion of said lead case ( 5,305); said rearward portion of said lead case ( 5,305) having a clinching part ( 27,308) formed on the outer surface of said lead case ( 5,305); said lead case bearing ( 6,310) having a raised projecting portion ( 26,309) forming an interference fit for said clinching part ( 27,308) of said lead case ( 5,305); said lead case bearing ( 6,310) having a hole ( 7,311) in a side of that lead case bearing; an axial slit ( 8,312) in said outer sleeve ( 1,301) facing said hole ( 7,311) in said bearing case ( 6,310); an axial recess ( 10,314) in said outer sleeve ( 1,301) surrounding said axial slit ( 8,312); a slider ( 9,313) slidably fitting said axial recess ( 10,314); said slider ( 9,313) having a projecting part ( 11,315) extending through said axial slit ( 8,312) into said hole ( 7,311) in said lead case bearing ( 6,310); a narrowing neck portion ( 12,312a) in a rearward end of said axial slit ( 8,312); said narrowing neck portion constructed to receive and retain said projecting parts ( 11,315) against movement, said slider ( 9,313) being locked against movement when said projecting part ( 11,315) is in said narrowing neck portion ( 12,312a). The swing-type mechanical pencil according to claim 1 including an eraser holding means ( 15) attached to a rear portion of said outer sleeve opposite said head end ( 21); and an elastic body ( 16) compressed between the rearward end of said lead case bearing ( 6) and said eraser holding means ( 15). Swing-type mechanical pencil according to claim 1 characterized in that said rearward portion of said lead case (305) having a struck part (307) and said clinching part (308) formed on the outer surface of said lead case (305); said raised projecting portion (309) on a forward end of said lead case bearing (310) forming an interference fit between said struck part (307) and said clinching part (308) to retain said lead case (305), whereby said slider may slide forward to manually advance said lead or slide backward to lock said slider to prevent lead from being extended by the knocking action of said hammer on said lead feeder. A swing-type mechanical pencil according to claim 3 including an elastic body (316) compressed between a rearward end of said lead case bearing (310) and a rear portion of said outer sleeve (301). A swing-type mechanical pencil according to claim 3 or 4 including an elongated slot (306) in a rearward end of said lead case (305); said hammer (302) fitting over the end of lead case (305) at the end having said elongated slot (306); whereby said struck part (307) prevents said hammer (302) from sliding off said lead case (305). A swing-type mechanical pencil according to claim 3, 4 or 5 including an elongated slot (306) in a rearward end of said lead case (305); said hammer being fitted over the end of said lead case (305) at the end having said elongated slot (306); whereby said struck part (307) on said lead case (305) prevents said hammer from sliding off said lead case (305).

Inventors: KAGEYAMA, SHUHEI, SUZUKI, TAKAHIKO, YAMAGISHI, YUICHI
Applicants: KOTOBUKI & CO., LTD.
Application year: 1988
Main classification: B43K21
IPC codes: B43K21, B43K24