MECHANISM FOR PUT IN AND OUT THE HEAD OF WRITING SHAFT IN A WRITING TOOL

Abstract: Mechanism for putting in and out of the head of the shaft through the head of an outer sleeve into and out of the outer sleeve comprising an outer sleeve 1, a long hole 2 formed in the outer sleeve 1, a clip 3 which is put in and out through the long hole 2 into and out of the outer sleeve 1, a shaft 4 which is inserted in the outer sleeve 1, a cam mechanism 8 which is cooperated with the clip 3 in such a manner that the cam mechanism 8 is moved forward and backward in the axial direction according to the movement of the clip 3 which is put in and out, and a spring 6 with which the shaft 4 is spring-biased toward the cam mechanism.

Description: 1. BACKGROUND OF THE INVENTION ( FIELD OF THE INVENTION ) This invention relates to mechanism for putting in and out the head of a writing shaft, for example one for ball-point pen, mechanical pencil, cutter into and out of an outer sleeve thereof. ( DESCRIPTION OF THE PRIOR ART ) Heretofore, there is writing tool as ball-point pen, mechanical pencil provided with a clip which is fixed at an outer sleeve thereof. The fixed clip disturbs writing or drawing particularly when line with uniform thickness is drawn with rotating the outer sleeve of writing tool, since the fixed clip is projected out from the outer sleeve. Also, there is writing tool with a clip which is removably attached to the outer sleeve, in which in taking notes the clip is removed from the outer sleeve while in carrying the writing tool with one the clip is attached to the outer sleeve. This writing tool has a disadvantage that attachment and removal of the clip is troublesome. There is known from US-A-3071112 a writing tool with a clip actuated latch mechanism for the writing shaft. This writing tool comprises a cam mechanism having front and rear slopes, actuating means integrally formed on said clip engaging said front and rear slopes. It further comprises a retaining shoulder at the lower end of said front slope for receiving and retaining said front actuating means and a fulcrum member being part of the cam mechanism at a place between said front and said rear slope. By pushing the clip downwardly the actuating means and slopes in combination force the writing shaft to move forward thereby projecting out of the writing tool. By pushing on the rear end of the clip said clip is forced to swing around the fulcrum member thereby releasing the front actuating means off the retaining shoulder and permitting the writing shaft to move backward into the writing tool by spring force. However this mechanism has the disadvantage that releasing of the actuating means off the retaining shoulder occurs very suddenly and smooth release becomes impossible. ( BRIEF SUMMARY OF THE INVENTION ) Accordingly it is an object of the invention to provide mechanism for putting in and out the head of writing shaft in which a clip can be put in and out from an outer sleeve while the head of the writing shaft can be put in and out from the outer sleeve according to the movement of the clip. The above object is accomplished by mechanism for putting in and out of the head of the shaft through the head of an outer sleeve into and out of the outer sleeve comprising an outer sleeve 1, a long hole 2 formed in the outer sleeve 1, a clip 3 which is put in and out through the long hole 2 into and out of the outer sleeve 1, a shaft 4 which is inserted in the outer sleeve 1, a cam mechanism 8 which is cooperated with the clip 3 in such a manner that the cam mechanism 8 is moved forward and backward in the axial direction according to the movement of the clip 3 which is put in and out, and a spring 6 with which the shaft 4 is spring-biased toward the cam mechanism. Further, the above object is accomplished by mechanism for putting in and out of the head of the shaft through the head of an outer sleeve into and out of the outer sleeve comprising an outer sleeve 1, a long hole 2 formed in the outer sleeve 1, a clip 3 which is put in and out through the long hole 2 into and out of the outer sleeve 1, a shaft 4 which is inserted in the outer sleeve 1, a cam mechanism 8 which is cooperated with the clip 3 in such a manner that the cam mechanism 8 is moved forward and backward in the axial direction according to the movement of the clip 3 which is put in and out, and a spring 6 with which the shaft 4 is spring-biased toward the mechanism, wherein said mechanism comprises front and rear retaining parts 10a, 10b formed in a base part 9 of the clip 3 which are engaged with the front and rear edge portions of the outer sleeve 1, respectively, a retaining hole 11 formed in the base part 9 of the clip 3, a moving member 15 including a front slope 12 which is descends toward the rear portion thereof and on which the front retaining part 10a of the clip 3 is slidable, a retaining part 13 for retaining the front retaining part 10a, said retaining part 13 being formed behind the front slope 12, and a rear slope 14 which descends toward the rear portion thereof and which is retained with the retaining hole 11 of the clip 3, said moving member 15 being positioned at the rear portion of the shaft 4. Further the above object is accomplished by Mechanism for putting in and out of the head of the shaft through the head of an outer sleeve into and out of the outer sleeve comprising an outer sleeve 101, a long hole 102 formed in the outer sleeve 101, a clip 103 which is put in and out through the long hole 102 into and out of the outer sleeve 101, a shaft 104 which is inserted in the outer sleeve 101, a cam mechanism 108 which is cooperated with the clip 103 in such a manner that the cam mechanism 108 is moved forward and backward in the axial direction according to the movement of the clip 103 which is put in and out, and a spring 106 with which the shaft 104 is spring-biased toward the cam mechanism, wherein said mechanism comprises front and rear retaining parts 110a, 110b formed in a base part 109 of the clip 103 which are engaged with the front and rear edge portion of the outer sleeve 101, respectively, a retaining hole 111 formed in the base part 109 of the clip 103, a moving member 115 including a front slope 112 which is descends toward the rear portion thereof and on which the front retaining part 110a of the clip 103 is slidable, a retaining part 113 for retaining the front retaining part 110a, said retaining part 113 being formed behind the front slope 112, a rear slope 114 which descends toward the rear portion thereof and which is retained with the retaining hole 111 of the clip 103, and plural insertion holes 118a, 118b, ··· ··· which are adapted to the shafts with different diameters. said moving member 115 being attached to the rear portion of the shaft 104 by way of insertion of the rear end of the shaft 104 into the insertion hole of the moving member 115. Furthermore, the above object is accomplished by mechanism for putting in and out of the head of the shaft through the head of an outer sleeve into and out of the outer sleeve comprising an outer sleeve 201, a long hole 202 formed in the outer sleeve 201, a clip 203 which is put in and out through the long hole 202 into and out of the outer sleeve 201, a shaft 204 which is inserted in the outer sleeve 201, a cam mechanism 208 which is cooperated with the clip 203 in such a manner that the cam mechanism 208 is moved forward and backward in the axial direction according to the movement of the clip 203 which is put in and out, and a spring 206 with which the shaft 204 is spring-biased toward the cam mechanism, wherein said mechanism comprises front and rear retaining parts 210a, 210b formed in a base part 209 of the clip 203 which are engaged with the front and rear edge portions of the outer sleeve 201, respectively, a retaining hole 211 formed in the base part 209 of the clip 203, a moving member 215 including a front slope 212 which is descends toward the rear portion thereof and on which the front retaining part 210a of the clip 203 is slidable, a retaining part 213 for retaining the front retaining part 210a; said retaining part 213 being formed behind the front slope 212, and a rear slope 214 which descends toward the rear portion thereof and which is retained with the retaining hole 211 of the clip 203, said moving member 215 being positioned at the rear portion of the shaft 204, the base area of the cam mechanism on the front retaining part 210a which is retained with the retaining part 213 is provided with a retaining hole 219a, a portion of the outer sleeve 201 is provided with a projection for release 220 and a cut 220 while the moving member 215 is provided with an insertion hole 221 in which the projection for release 220 is inserted. Furthermore, the above object is accomplished by mechanism for putting in and out of the head of the shaft through the head of an outer sleeve into and out of the outer sleeve comprising an outer sleeve 301, a long hole 302 formed in the outer sleeve 301, a clip 303 which is put in and out through the long hole 302 into and out of the outer sleeve 301, a shaft 304 which is inserted in the outer sleeve 301, a cam mechanism 308 which is cooperated with the clip 303 in such a manner that the cam mechanism 308 is moved forward and backward in the axial direction according to the movement of the clip 303 which is put in and out, and a spring 306 with which the shaft 304 is spring-biased toward the cam mechanism, wherein said mechanism comprises front and rear retaining parts 310a, 310b formed in a base part 309 of the clip 303 which are engaged with the front and rear edge portions of the outer sleeve 301, respectively, a retaining hole 311 formed in the base part 309 of the clip 303, a moving member 315 including a front slope 312 which is descends toward the rear portion thereof and on which the front retaining part 210a of the clip 303 is slidable, a retaining part 313 for retaining the front retaining part 310a; said retaining part 313 being formed behind the front slope 312, and a rear slope 314 which descends toward the rear portion thereof and which is retained with the retaining hole 311 of the clip 303, said moving member 315 being positioned at the rear portion of the shaft 304, a portion of the outer sleeve 301 facing the base portion on the side of the front retaining part 310a which is to be retained therewith and a portion of the moving part 315 of the cam mechanism 308 being provided with retaining holes 319a, 319b, respectively, a release operation member 320 which is inserted in the insertion hole 319 of the retaining hole 319a is positioned facing the base part on the side of the front retaining part 310, an insertion hole 321 in which the release operation member 320 is inserted being formed in the moving member 315. 2. BRIEF DESCRIPTION OF THE DRAWINGS In the drawings, Fig. 1 is a vertical section showing the construction of a first embodiment of a mechanism according to the present invention, Fig. 2 is an exploded view thereof, Fig. 3 is a vertical section showing the construction of a second embodiment of a mechanism according to the present invention, Fig. 4 is a perspective view of the cam mechanism shown in Fig. 3. Figs. 5(a)-(c) are sectional views showing various example of connecting part of cam mechanisms according to the present invention which are connected with shafts, respectively, Figs. 6(a) and (b) are partially vertical sectional views of an another embodiment of cam mechanisms according to the present invention, (a) showing the state that the clip is projected out and (b) the state that the clip is drawn in. Fig. 7 is a vertical section of anothewr example of writing shaft which is apllicable to the cam mechanism according to the present invention. Fig. 8 is a vertical section of further example of writing shaft which is apllicable to the cam mechanism according to the present invention. Figs. 9(a) and (b) are patially vertical sectional views of a third embodiment of cam mechanisms according to the present invention, (a) showing the state that the clip is projected out and (b) state that the clip is drawn in, respectiveky, Fig. 10 is a diagram of the cut in the above embodiment shown in Figs.9(a)(b). Figs. 11(a) and (b) are partially vertical sectional views of a fourth embodiment of a mechanism according to the present invention, (a) showing the state that the clip is projected out and (b) the state that the clip is drawn in in the present embodiment, respectiveky, Figs. 12(a) and (b) are vertical sectional views of parts of clip showing the state that the clip is projected out and the state that the clip is drawn in another embodiment, respectively, 3. DETAILED DESCRIPTION Referring first to an embodiment of the present invention shown in Figs.1 and 2, numeral 1 designates an outer sleeve and numeral 2 designates a long hole in the axial direction made in the rear portion of the outer sleeve 1. A clip 3 is put in and out through the long hole 2. A spring 6 is inserted between a spring bearing 17 of a writing shaft, for example of one for ball-point pen 4 and a head member 5. Numeral 8 designates a cam mechanism with which a head of ball-point pen 7 of the writing shaft 4 can be put in and out, according to the operation for putting in and out the clip 3, against or through the spring force of the spring 6, and which is provided between the writing shaft 4 and the clip 3. The cam mechanism 8 comprises front and rear retaining parts 10a, 10b formed in a base part 9 of the clip 3 which are engaged with front and rear edge portions of the long hole 2 of the outer sleeve 1, respectivly, a retaining hole 11 formed in the central part of the base part 9, a moving member 15 including a front slope 12 which is formed in the front with descending toward the rear thereof and on which the front retaining part 10a is slidable, a retaining part 13 formed behind the front slope 12 and with which the front retaining part 10a is retained, a rear slope 14 which descends toward the rear thereof and which is retained with the retaining hole 11, and a small projection 16 formed behind the rear slope 14, the forward portion of the moving member being attached to the rear portion of the writing shaft 4 by way of insertion. In the above construction, for example when the writing tool is used, the forward part of the clip 3 is pushed, by which the front slope 12 and the rear slope 14 are pushed by the front retaining part 10a and the edge of the retaining hole 11 formed in the base part 9 of the clip 3, respectively, in which the moving member 15 and the writing shaft for ball-point pen 4 are moved forward against the spring 6 so that the head of ball-point pen 7 of the writing shaft 4 is projected out of the head member 5. At the same time the front retaining part 10a is slid on the front slope 12 to the retaining part 13 and retained therewith so that the state that the clip 3 is drawn in is kept. Further, for example in carrying the writing tool with one or in drawing in the head of ball-point pen 7 of the writing shaft 4 in the outer sleeve, the rear part of the clip 3 is pushed, by which the base part 9 of the clip 3 is moved outward with being supported on the small projection 16 as the fulcrum and utilizing the principles of the lever and fulcrum so that the front retaining part 10a is released from the retaining part 13 so as to be slid on the front slope 12 while the rear slope 14 presses against the edge of the retaining hole 11 by which the moving member 15 is moved slightly forward against the spring 6 so that the front retaining part 10a is be released from the rear retaining part 13 behind the front slope 12 and slid on the front slide 12 and thereafter the writing shaft for ball-point pen 4 and the moving member 15 are moved backward with the spring force of the spring 6 and this movement makes the clip 3 project out. In this case, it is preferable that the cam mechanism according to the invention is provided with the small projecrion 16 behind the rear slope 14, because the contact of the base part 9 of the clip 3 with the small projection 16 enables the smooth release of the front retaining part 10a from the retaininf part 13 when the clip 8 is pressed. According to the present embodiment, for example in using the writing tool (in taking notes), the forward part of the clip 3 is pushed by which the cam mechanism 8 is moved against the spring 6, with the clip 3 being drawn in while the head of ball-point pen 7 of the writing shaft for ball-point pen 4 can be projected out of the head member 5. Therefore it is possible to take notes without being interfered with the clip 3 since both the state that the clip 3 is drawn in and the state that the head of ball-point pen 7 of the writing shaft 4 is projected out of the head member can be maintained. Besides for example in carrying the writing tool with one or in drawing in the head of ball-point pen 7 of the writing shaft 4, the rear part of the clip 3 is pushed by which the cam mechanism 8 ia moved with the spring force of the spring 6, thereby the state that the clip 3 is drawn in is released so that the clip 3 is projected out while the head of ball-point pen 7 of the writing shaft 4 is drawn in through the head member 5 of the outer sleeve 1, thus it is possible to carry the writing tool with one with pocket being put between the clip. Further as the cam mechanism according to the present embodiment is formed with the clip 3 and the moving member 15, number of parts can be reduced as compared with the usual rotary cam mechanism and can be manufactured at low cost. The present embodiment is illustrated in the case of the cam mechanism for putting in and out the head of the writing shaft for ball-point pen 4. But it goes without saying that the present invention can be applied for the shaft of the cutter. Then, referring to another embodiment shown in Figs. 3 to 4, numeral 101 designates an outer sleeve and numeral 102 designates a long hole in the axial direction made in the rear portion of the outer sleeve 101. A clip 103 is removably inserted in the long hole 102. A spring 106 is inserted between a spring bearing 117 of a writing shaft, for example of one for ball-point pen 104 and a head member 105. Numeral 108 designates a cam mechanism with which a head of ball-point pen 107 of the writing shaft 104 can be put in and out, according to the operation for putting in and out the clip 103, against or through the spring force of the spring 106, and which is provided between the writing shaft 104 and the clip 103. In this embodiment, a cam mechanism 108 comprises the front and rear retaining parts 110a and 110b formed in the base part 109 of the clip 103 which are engaged with the front anf rear edge portions of the outer sleeve 101, respectively, a retaining hole 111 in the axial direction formed in the central part of the base part 109, a moving member 115 including the front slope 112 which is formed in the front with descending toward the rear thereof and on which the front retaining part 110a is slidable, a retaining part 113 formed behind the front slope 112 and with with the front retaining part 113 is retained, a rear slope 114 which descends toward the rear thereof and which is retained with the retaining hole 111, and the small projection 116 formed behind the rear slope 114, said forward portion of the moving member being conected with the rear portion of the writing sfaft 104, said rear portion of the writing shaft 104 being inserted in one insertion hole 118a of two insertion holes 118a, 118b which are adapted for two kinds of writing shafts with outer diamters which are different from each other respectively ( Figs. 3 and 5(b)). In this embodiment, the cam mechanism 108 is provided with a retataining hole 113a in which the front retaining part 110a. In the above construction, for exampel, when the writing tool is used , the forward part of the clip 103 is pushed, by which the front slope and the rear slope 114 are pushed by the front retaining part 110a and the edge of the retaining hole 111 formed in the base part 109 of the clip 103, respectively, by which the moving member 115 and the writing shaft for ball-point pen 104 are moved forward against the spring 106 so that the head of the ball-point pen 107 of the writing shaft 104 is projected out of the head member 105. At the same time, the front retaining part 110a ia slid on the front slope 112, advanced into the retaining hole 113a and retained with the retaining part 113 so that the clip 103 can be maintained in the state of being drawn in(Fig. 6(a). Further, for example in carrying the writing tool with one or in drawing in the head of ball-point pen in the outer sleeve the rear part of the clip 103 is pushed by which the base part 109 of the clip 103 is moved with being supported on the small projection 116 as the fulcrum and utilizing the principled of the lever and fulcrum so that the front retaining part 110a comes out of the retaining part 113 and released from the retaining part 13 ( as shown with imaging lines in Fig. 6 ) while the slope 14 presses against a slanting surface about retaining hole 111 by which the moving member 115 is moved slightly forward against the spring 106 and the writing shaft for ball-point pen 104 and the moving member 115 are moved backward with the spring force of the spring 106 and thus this movement mekes the clip 103 project out ( Fig. 6(a)). In this case, it is preferable that the cam mechanism according to the invention is provided with the small projection 16 behind the rear skope 114, because the contact of the base part 109 of the clip with the small projection 116 enables the smooth release of the front retaining part 110 from the retaining part 113 utilizing the principles of the lever and fulcrum when the rear portion of the clip 103 is pushed. The projection 116 may be provided on goth sides of the backward end of the rear slope 114. However, alternatively the projection 116 may be provided either on the lower surface of the clip 103 as shown with imaginary lines in Fig. 3 or on the rear end of the lower surface of the cam mechanism 108 which is oposed to the inside of the outer 101. Further, as the forward portion of the moving part 115 of the cam nechanism 108 is provided with the insertion holes 108a, 108b which are adapted for two kinds of writing shafts with outer diameters which are different from each other if the writing shaft 104 has larger outer diameter the writing shaft 104 can be inserted selectively in the insertion holes 118b with larger inner diameter while if the writing shaft 104 has smaller outer diameter, the writing shaft 104 can be inserted in the holes 118a with smaller inner diameter. Fig. 5(a) shows an example of the insertion holes in which the moving member 115 is provided with two eccentric insertion holes 118a. 118b which have different inner diameters from each other, Fig. 5(b) showa an another example of the inserted holes in which the moving member 115 is provided with two concentric insertion holes 118a, 118b. Fig. 5(a) shows a further example of the insertion holes 118a to 118c in which the moving member 115 is provided with three concentric insertion holes. Number of insertion holes 118a,118b, ··· ··· ··· is not restricted within two or three, but may be thereover. According to the present embodiment by pdshing the forward portion of the clip 103, the clip 103 can be drawn in while the head of ball-point pen 107 of the writing shaft 104 can be projected out of the head member 105. Further, as the forward portion of the moving member 115 is provided with plural insertion holes 118a, 118b ··· ··· ··· for plural writing shafts which have different diameters from each other insertion hole can selected according to the outer diameter of the writing shaft 104. Therefore, without increasing number of parts use of various writing shafts which have different diameters from each other is possoble. In the present embodiment, the moving member 115 may be either connected or in contact with the writing shaft without being provided with the insertion holes 118a, 118b ··· ··· ··· or may be an integral part of the writing shaft. Further the projection 116 which the cam mechanism 108 has enables the clip 103 to smoothly and positively be put in and out. The retaining part 110a of the cam mechanism 108 is to be inserted not only enables the head 7 of the writing shaft 104 to be more positively maintained in the state of being projected out but also enables stroke of the movement of the clip 103 to be made larger so that the easy handing of the clip can be improbed. In the present embodiment, the top of the rear slope 114 of the cam mechanism 108 may be made lower than the lower surface of the base part 9 of the clip 103 as shown with imaginary lines in Fig. 3 , the forward portion of the cam mechanism 108 (the forward portion of the moving member 115 )may be provided with a projection for prevention of the coming-off 115a and qith a slit for giving flexivility 115b while the rear portion of the inside of the outer sleeve 101 may be provided with a projection for prevention of the coming-off 101a wherein it can be prevented due to the contact of the projection 115a of the moving member 115 with the projection 101a of the each sleeve 101 that the cam mechanism 108 slips out of the outer sleeve 101 when the head member 105 the spring 6 and the writing shaft 104 is removed. In setting up the cam-mechanism 108, the cam-mechanism 108 is inserted in the outer sleeve 101 through the forward opening thereof moved backward over the projection of the outer sleeve 101 utilizing the flexibility due to the slit 115b and thereafter the clip 103 is attached through the long hole 102. Fig. 7 shows another example of the writing shaft which can be applied to the present embodiment, wcherein the writing shaft is for mechanical pencil and described in Japanese utility model application 77145/1987 of the applicant. The writing shaft for the mechanical pencil shown in Fig. 7 comprises a sleeve 121 which is slidably arranged in the head member 120, head feeding mechanism 123 which is inserted in the sleeve 121, said lead feeding mechanism 123 allowing the forward movement of lead but preventing the retreating movement thereof, a slider 125 which is arranged in the head member 120, said slider being provided with a frictional force-imparting member 124 for imparting the desired frctional foece to the lead 122, a spring 126 for spring-loading the slider 125 so that the slider 125 is moved forward by which automatic feeding of the lead 122 is carried out, and a lead pipe 127 for guiding a lead 122 from the outside ( through an opening 127a ) to the lead-feeding mechanism 123. The outer sleeve 119 is provided with a spring bearing 119 for bearing a spring 6. Numeral 128 designates a lead chuck, numeral 130 designates a slide pipe of the slider 125, numeral 132 designates which has the tapered wall said tubu surrounding the lead chuck 128, and numeral 131 designates a ball arranged between the tube 132 and the lead chuck. Fig. 8 shows a further example of the writing shaft can be applied to the present embodiment wherein the writing shaft is for mechanical pencil. In Fig. 8, numeral 134 designates a sleeve which connect the head member 120 with the outer sleeve 119 in which a tube 132 with a tapered wall 133 is inserted or may be the integral part of the tube 132). Numeral 135 designates a lead chuck which is divided into two parts in the axial direction. The outer surface of the lead chuck 135 is provided with a projection 136 which is in contact with the tapered wall of the tube 132. In the Fig. 8, elements which are same parts as ones of mechanical pencil shown in Fig. 7 are given like reference numerals. In the examle shown in Fig.7, the ball 131 may be replaced with the projection 136 as shown in Fig. 8 which is contact with the outer surface of the lead chuck 135. The writing shaft for ball-point pen 104 shown in Fig. 3 can be replaced with the above writing shaft for mechanical pencil 104 shown in Fig. 7 or 8. The moving member 115 may be the integral part of the writing shaft for mechanical pencil 104, or it may be connected with the writing shaft for mechanocal pencil through an adpter. It goes without saying that the present invention can be applied for the sfaft of the cutter. Then referring to further embodiment shown in Fig. 9(a) to 10, numeral 201 designates an outer sleeve and numeral 202 designates a long hole in the axial directuin made in the rear poation of the outer sleeve 201. A clip 203 is removably inserted in the long hole 202. A spring 206 is inserted between a spring bearing 217 of a writing shaft, for example of a writing shaft for ball-point pen 204 and a head member 205. Numeral 8 designates a cam mechanism with which a head of ball-point pen 207 of the writing shaft 204 can be put in and out, accordingly to the operation for putting in and out the clip 203, against or through the spring force of the spring 206, and which is provided between the writing shaft 204 and the clip 203. In the embodiment, a cam mechanism 208 comprises the front and rear retaining parts 210a and 210b formed in the base part 209 of the clip 203 which is engaged with the front and rear edge portions of the outer sleeve 201, respectively, a retaining hole 211 in the axial direction forward in the central part of the base part 209, a moving part 215 including the front slope 212 which is formed in the front with descending toward the rear thereof and on which the front retaining part 210a is slidable, a retaining part 213 formed behind the front slope 212 and with which the front retaining part 213 is retainined, a rear slope 214 which descends toward the rear thereof and which is retained with the retaining hole 211, and the small projection 216 formed behind the rear slope 214, the forward portion of said moving member being connected withthe rear portion of writing shaft 204, said rear portion of the writing shaft 204 being inserted in one insertion hole of two insertion holes which are adapted for two kind of writing shafts with outer diameters which are diffrrent from each other respectively. The base area of the cam mechanism on the front retaining part 210a which is retained with the retaining part 213 is provided with a retaining hole 219a. A portion of the outer sleeve 201 is provided with a projection for release 220 and a cut 222 for example in the shape of " U ", while the moving member 115 is provided with an insertion hole 221 in which the projection for release 220 is inserted. In the above construction, for example when the writing tool is used the forward part of the clip 203 is pushed by which the front slope 212 and the rear slope 214 are pushed by the front retaining part 210a and the edge of the retaining hole 211 formed in the base part 209 of the clip 203, respestively, by which the moving member 215 and the writing shaft 204 are moved forward aginst the spring 206 so that the projection for release 220 comes out of the insertion hole 221 while the head of ball-point pen 207 of the writing shaft 204 is projected out of the head member 205. In this time, the front retaining part 210a is slid on the front slope 212 into the retaining hole 219 and retained with the retaining part 213 so that the clip can be maintained in the state of being drawn in (Fig. 9(a)). Further for example in carrying the writing tool with one or in drawing in the head of ball-point pen 207 of the writing shaft for ball-point pen 204 in the outer sleeve the projection for release 220 is pushed by which the front ertaining part 210a is pushed so that the front retaining part 210a is released from the retaining part 213, the front retaining part 210a pressing against the front slope 212 while the moving member 215 is moved slightly forward against the spring 206. Then the writing shaft for ball-point pen 204 and the moving member 215 is moved background by the spring force of the spring 206 so that the clip 203 is projected out. In the case, the backward movement of the moving member 215 can be achieved by inserting the projection for release 220 in the insertion hole 221. When the backward portion of the clip 203 is pushed the base part 209 of the clip 203 is moved on the projection 216 of the rear slope 214 as the fulcrum so that the front retaining part 210a comes out of the retaining hole 219b is released from the retaining part and pressed against the front slope 212 (shown with imaginary lines in Fig. 9(b))while slanting surface about the retaining hole 211 is pressed against the rear slope 214 so that the moving member 215 is moved slightly forward against the spring 206 and then the writing shaft 204 and the moving member 215 is moved backward by the spring force of the spring 206 so that the clip 203 can be projected out (Fig. 9(a)). In this case it is preferable that the cam mechanism according to the present invention is provided wiih the projection 216 on both sides of the rear end of the rear slope 214 because the base part 209 of the clip 203 is supported on the projection 216 so that the release of the front retaining part 10a from the retaining hole 219b can be smoothly carried out utilizing the principles of the lever and fulcrum when the background portion of the clip 203 is pushed. Further as the forward portion of the moving part 215 of the cam mechanism 208 is provided with the insetion holes which are adapted for two kinds of writing shafts with outer diameters which are different from each other in the same manner as the embodiment shown in Fig. 3 if the writing shaft 4 has larger outer diameter, the writing shaft 204 can be inserted selectively in the insertion holes with larger inner diameter while if the writing shaft 204 has smaller outer diameter the writing shaft 204 can be inserted in the holes 18a with smaller inner diameter. According to the present embodiment for example in using the writing tool (in taking notes), the forward part of the clip 203 is pushed by which the cam mechanism 208 is moved against the spring 206, with the clip 203 being drawn in while the head of ball-point pen 207 of the writing shaft 204 for ball-point pen 204 can be projected out of the head member 205. Therefore it is possible to take notes without being interfered with the clip 203 since both the state that the clip 203 is drawn in and the state that the head of ball-point pen 207 of the writing shaft 204 is projected out of the head member can be maintained by retaining the front retaining part 210a of the clip 203 with the retaining part 213. Besides for example in carrying the writing tool with one or in drawing in the head of ball-pointpen 207 of the writing shaft 204, the projection for release 220 is pushed by which the base part on the front retaining part 210a is pushed, comes out of the retaining part 213, or the rear part of the clip 203 is pushed by which the cam mechanism is moved by the spring force of the spring 206 thereby the state that the clip 203 is drwan in is released so that the clip 203 is projected out while the kind of ball-point pen 207 of the writing shaft 204 is drawn in through the head member 205 of the outer sleeve 201, thus it is possible to carry the writing tool with one with pocket being put between the clip. Further as the forward portion of the moving memver 215 is provided with plural insertion holes for plural writing shafts which have different diameters from each other in the same manner as the previously descrived embodiment shown in Fig. 3, insertion hole can be delected to the outer diameter of the writing shaft 204. Therefore without increasing number of parts use of various writing shafts which have different diameters from each other is possible. In the present embodiment the moving memebr 215 can be connected with the writing shaft without being provided with the insertion holes, or may be am integral part of the writing shaft. Further as putting in and out of the head of ball-point pen 207 of the writing shaft 204 can be very certainly and easily carried out, since by pushing the clip 203, the front retaining part 210a can be retained with the retaining part of the cam mechanism 208 while by pushing the projection for release 220 the front retaining part 210a can be released from the retaining part 213. Further as at least one portion of the rear portion of the cam mechanism 208 or an area of said rear portion facing the outer sleeve 201 and on the lower surface of the clip 203 is provided with the projection 216, it is possible that the clip 203 is smoothly and certainly put in and out the clip 203. As the cam mechanism 208 is provided with the insertion hole 219a in which the front retaining part 210a is inserted, it is possible not only to more certainly maintain the projecting state of the state of the head of the writing shaft 204 but only to make the stroke of the movement of the clip 203 so that the easy handling of the clip can be improved. Then referring to further embodiment shown Figs. 11(a)(b), numeral 301 designates an outer sleeve and numeral 302 designates a sleeve 1. A clip is removably inserted in the long hole 302. A spring 306 is inserted between a spring bearing 317 of a writing shaft, for example of a writing shaft for ball-point pen 304 and a head of ball-point pen 307 of the writing shaft 304 can be put in and out, according to the operation for putting in and out the clip 303, against or through the spring force of the spring 306, and which is provided between the writing shaft 304 and the clip 303. In this embodiment, cam mechanism 308 comprises the front and rear retaining parts 310a and 310b formed in the base part 309 of the clip 303, said retining parts 310a and 310b formed in the base part 309 of the clip 303, said retaining parts 310a and 310b being engaged with the front and rear portion of the outer sleeve 301, respectively, a retaining hole 311 in the axial direction formed in the central part of the base part 309, a moving part 315 including the front with descending toward the rear thereof and in which the front retaining part 310a is slidable, a retaining part 313 formed the front slope 312 and with which the front retaining part 313 is retained, a rear slope 314 which descends towards the rear thereof and which is retained with the retaining hole 311, and the small projection 316 formed behind the rear slope 314, the forward portion of said moving member being connected with the rear portion of the writing shaft 314, said rear portion of the writing shaft 314 being inserted in one insertion hole of two insertion holes which are adapted for two kinds of writing shafts with outer diameters which are different from each other respectively. A portion of the outer sleeve 301 facing the base portion on the side of the front retaining part 310a which is to be retained therewith and a portion of the moving part 315 of the cam mechanism 308 are provided with retaining holes 319a, 319b, respectively. A release-operation member 220, which it is inserted in the insertion hole 319a formed in the outer sleeve 301 and brought in contact with an inner edge portion 319 of the retaining hole 319a, is positioned facing the base part on the side of the front retaining part 310. An insertion hole 321 in which the release-operation member 320 is inserted is formed in the moving member 315. In the above construction, for example when the writing tool is used the forward part of the clip 303 is pushed by which the front slope 312 and the rear slope 314 are pushed by the front retaining part 310a and the edge of the retaining hole 311 formed in the base part 309 of the clip 303, respestively, by which the moving member 315 and the writing shaft 304 are moved forward aginst the spring 306 so that the release-operation member 320 comes out of the insertion hole 321 while the head of ball-point pen 307 of the writing shaft 304 is projected out of the head member 305. In this time, the front retaining part 310a is slid on the front slope 312 into the retaining hole 319 and retained with the retaining part 313 so that the clip can be maintained in the state of being drawn in (Fig. 11(b)). Further for example in carrying the writing tool with one or in drawing in the head of ball-point pen 307 of the writing shaft for ball-point pen 304 in the outer sleeve the release operation member 320 is pushed by which the front retaining part 310a is pushed so that the front retaining part 310a is released from the retaining part 313, the front retaining part 310a pressing against the front slope 312 while the moving member 315 is moved slightly forward against the spring 306. Then the writing shaft for ball-point pen 304 and the moving member 315 is moved background by the spring force of the spring 306 so that the clip 303 is projected out. In the case, the backward movement of the moving member 315 can be achieved by inserting the projection for release 320 in the insertion hole 321. When the backward portion of the clip 303 is pushed the base part 309 of the clip 303 is moved on the projection 316 of the rear slope 314 as the fulcrum so that the front retaining part 310a comes out of the retaining hole 319b is released from the retaining part and pressed against the front slope 312 (shown with imaginary lines in Fig. 11(b))while slanting surface about the retaining hole 311 is pressed against the rear slope 314 so that the moving member 315 is moved slightly forward against the spring 306 and then the writing shaft 304 and the moving member 315 is moved backward by the spring force of the spring 306 so that the clip 3 can be projected out (Fig. 11(a)). In this case it is preferable that the cam mechanism according to the present invention is provided with the projection 316 on both sides of the rear end of the rear slope 314 because the base part 309 of the clip 303 is supported on the projection 316 so that the release of the front retaining part 310a from the retaining hole 319b can be smoothly carried out utilizing the principles of the lever and fulcrum when the background portion od the clip 3 is pushed. Further as the forward portion of the moving part 315 of the cam mechanism 308 is provided with the insertion holes which are adapted for two kinds of writing shafts with outer diameters which are different from each other in the same manner as the embodiment shown in Fig. 3 if the writing shaft 304 has larger outer diameter, the writing shaft 304 can be inserted selectively in the insertion holes with larger inner diameter while if the writing shaft 304 has smaller outer diameter the writing shaft 304 can be inserted in the holes with smaller inner diameter. According to the present embodiment for example in using the writing tool (in taking notes), the forward part of the clip 303 is pushed by which the cam mechanism 308 is moved against the spring 306, with the clip 303 being drawn in while the head of ball-point pen 307 of the writing shaft 304 for ball-point pen 304 can be projected out of the head member 305. Therefore it is possible to take notes without being interfered with the clip 303 since both the state that the clip 303 is drawn in and the state that the head of ball-point pen 307 of the writing shaft 304 is projected out of the head member can be maintained by retaining the front retaining part 310a of the clip 303 with the retaining part 313. Besides for example in carrying the writing tool with one or in drawing in the head of ball-pointpen 307 of the writing shaft 304, the release operation memebr 320 is pushed by which the base part on the front retaining part 310a is pushed, comes out of the retaining part 313, or the rear part of the clip 303 is pushed by which the cam mechanism is moved by the spring force of the spring 306 thereby the state that the clip 303 is drawn in is released so that the clip 303 is projected out while the kind of ball-point pen 307 of the writing shaft 304 is drawn in through the head member 305 of the outer sleeve 301, thus it is possible to carry the writing tool with one with pocket being put between the clip 303. Further as the forward portion of the moving memver 315 is provided with plural insertion holes for plural writing shafts which have different diameters from each other in the same manner as the previously descrived embodiment shown in Fig. 3, insertion hole can be selected to the outer diameter of the writing shaft 304. Therefore without increasing number of parts use of various writing shafts which have different diameters from each other is possible. In the present embodiment the moving member 315 can be connected with the writing shaft without being provided with the insertion holes, or may be an integral part of the writing shaft. Further as putting in and out of the head of ball-point pen 307 of the writing shaft 304 can be very certainly and easily carried out, since by pushing the clip 303, the front retaining part 310a can be retained with the retaining part of the cam mechanism 308 while by pushing the release operation member 320 the front retaining part 30a can be released from the retaining part 313. Further as at least one portion of the rear portion of the cam mechanism 308 or an area of said rear portion facing the outer sleeve 301 and on the lower surface of the clip 303 is provided with the projection 316, it is possible that the clip 303 is smoothly and certainly put in and out the clip 303. As the cam mechanism 308 is provided with the insertion hole 319a in which the front retaining part 310a is inserted, it is possible not only to more certainly maintain the projecting state of the state of the head of the writing shaft 4 but only to make the stroke of the movement of the clip 303 so that the easy handling of the clip cap be improved. Figs. 12(a)(b) show another embodimrnt, where the end portion od the release operation member 320 is protruding from the outer surface of the outer sleeve 1. It goes without saying that the present invention can be applied for the shaft of cutter.

Claims: Mechanism for extending and retracting the head (7) of a writing shaft (4) through the head end (5) of an outer sleeve (1) in which the writing shaft (4) is inserted, comprising a long hole (2) formed in the outer sleeve (1); a clip (3) adapted to be moved in and out of said outer sleeve (1) through said long hole (2); a cam mechanism (8) having front and rear slopes (12,14), actuating means (9,10a) integrally formed on said clip (3) engaging said front and rear slopes (12,24); a socket in said cam mechanism (8) receiving an end of said writing shaft (4); a spring (6) holding said writing shaft (4) in said socket; a retaining shoulder (13) at the lower end of said front slope for receiving and retaining said front actuating means (10a); a fulcrum member (16) adapted for receiving said rear actuating means (9), characterized in that the fulcrum member (16) is disposed axially at or rearward of the place of engagement of said rear actuating means (9) and said rear slope (14); whereby downward pressure on a forward portion of said clip (3) moves said cam mechanism (8) and writing shaft (4) axially forward extending the head end (7) with said front actuating means (10a) being engaged in and retaining by said retaining shoulder (13) and downward pressure on a rear portion of said clip (3) causes said rear actuating means (9) to engage said fulcrum member (16) thereby pushing slightly forward said cam mechanism (8) and rotating said clip (3) so as to release said front actuating means (10a) from said retaining shoulder (13) allowing said cam mechanism and said writing shaft to retract. The mechanism according to claim 1 in which said fulcrum member comprises an upward curving projection (16) at the end of said rear slope (14) so that said rear actuating means (9) rides up said curved projection (16) when pressure is applied to a rear portion of said clip (6) dislodging said from actuating means (10a) from said retaining shoulder (13). The mechanism according to claim 1 in which said rear actuating mechanism (9) is formed by a lengthwise hole in said clip (3) receiving said rear slope (14). The mechanism according to claim 1 in which said front actuating means (10a) comprises a retaining portion formed on said clip for retaining said clip in said long hole (2) in said sleeve (1).

Inventors: KAGEYAMA, SHUHEI, KUBOTA, MASUO, MITSUYA, YOSHIHIDE, NAKAZATO, YOUICHI
Applicants: KOTOBUKI & CO., LTD.
Application year: 1989
Main classification: B43K24
IPC codes: B43K24, B43K25