US3713745A - Push-type mechanical pencil - Google Patents

Push-type mechanical pencil Download PDF

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Publication number
US3713745A
US3713745A US00104163A US3713745DA US3713745A US 3713745 A US3713745 A US 3713745A US 00104163 A US00104163 A US 00104163A US 3713745D A US3713745D A US 3713745DA US 3713745 A US3713745 A US 3713745A
Authority
US
United States
Prior art keywords
barrel
spring
inner casing
guide tube
lead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00104163A
Other languages
English (en)
Inventor
Y Horie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nihon Bungu Co Ltd
Japan Stationery Co Ltd
Original Assignee
Dai Nihon Bungu Co Ltd
Japan Stationery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nihon Bungu Co Ltd, Japan Stationery Co Ltd filed Critical Dai Nihon Bungu Co Ltd
Application granted granted Critical
Publication of US3713745A publication Critical patent/US3713745A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/08—Writing-core feeding mechanisms with the writing-cores fed by screws
    • B43K21/10—Writing-core feeding mechanisms with the writing-cores fed by screws with separate writing-core remnants ejecting-bar
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K21/00—Propelling pencils
    • B43K21/02—Writing-core feeding mechanisms
    • B43K21/027—Writing-core feeding mechanisms with sliding tubelike writing-core guide

Definitions

  • An objective of the present invention is to provide a push-type mechanical pencil in which a fine lead guide tube is exposed from and concealed into a barrel by simple operations.
  • FIG. 2 is a side view of the push-type mechanical pencil of FlG. 1, showing the concealed position of the guide tube;
  • FIG. 3 is a partially sectioned enlarged side view showing the fore portion of the push-type mechanical pencil of FIGS. 1 and 2;
  • FIG. 5 is a top plan view of a portion of the inner cylindrical tubular member showing its slot.
  • the mechanical pencil includes a ferrule l, with a fine lead guide tube 2 protruding through tip of the ferrule 1.
  • a fore end portion of an inner casing 5 is fixed upon, or formed integral with, the rear open end of the ferrule 1. These parts are exposed outside of a frust-conical fore end portion 4 of a barrel 3.
  • the mechanical pencil is of the push-type and its guide tube 2 is in the exposed portion.
  • An end cap 6 protrudes through the rear opening of the barrel 3. in FIG. 2 the guide tube 2, as well as the ferrule 1, is concealed in the barrel 3. As the mechanical pencil is in its concealed position, the end cap 6 is longer than its position shown in FIG. 1.
  • the added length of cap 6 is the same length as the retracted portions (ferrule 1, guide tube 2 and casing 5).
  • the innercasin'g 5 is fixed to the rear open end of the ferrule l, in any convenient manner, or may be formed integral therewith. As shown in FIG. 3, the rear inner end portion of the ferrule 1 and the fore inner end portion of the inner casing 5 are connected together by means of a first spring-receiving bushing member 42, the connections being at 43 and 45.
  • a helical coil spring 8, which serves to eject a lead 11 through the guide tube 2, is provided between the first spring receiving member 42 and a second spring receiving member 18 (see FIG. 4).
  • Spring receiving member 18 is connected to the rear end ofa lead guide member 19, the fore portion of which comprises a chuck member'9 and a ring 10.
  • a lead storing housing 7 is fixed at its fore end to the second spring-receiving member 18 and connected at its rear end (not shown) to the end cap 6.
  • a cylindrical tubular member 15 has a slot 14 which is hooked at its fore end.
  • Member 15 is positioned between the barrel 3 and the inner casing 5 so as not to move relative to the barrel.
  • a projection 12 is formed integral with the inner casing 5 near its front end. Projection 12 is fitted in the slot 14so that the inner casing 5 is slidable relative to the barrel 3 and to the cylindrical member 15 along the lengthwise direction of the mechanical pencil.
  • Another spring 16, which serves to advance and retract the inner casing 5 along the slot 14, is provided between the rear end of the cylindrical member 15 and another projection 17 formed at the rear end of the inner casing 5.
  • the inner casing 5 is advanced initially to expose the guide tube 2 as well as the ferrule l to the outside of the barrel 3 as described hereinafter.
  • a pushing force strong enough to compress the spring 16 but not strong enough to compress the spring 8 is applied forwardly to the end cap 6 of the mechanical pencil in the concealed position in FlG. 2, it compresses the spring 16, as the force is transmitted to the rear projection 17 by way of the housing 7, second spring-receiving member 18, spring 8, first spring-receiving member 42 and inner casing 5. Therefore, the inner casing 5 slides forwardly relative to the barrel 3 and the fine lead guid tube 2 is exposed outside of the barrel 1.
  • Reference numeral 12a in FlGS. 4 and 5 shows the position of the fore projection before moving.
  • fore projection 12 is ad vanced along the hooked slot 14, it comes to the fore end of the slot 14 and is turned to enter into its hook portion 13, thereby the guide tube 2 is maintained in the exposed position as shown in FIG. 1.
  • the lead 11 is ejected by way of a bore 20, guide member 19, chuck member 9 and ring 10.
  • the push-type mechanical pencil of the embodiment of the invention utilizes conventional structure.
  • the inner casing 5 is retracted by means of the spring 16 to conceal the guide tube 2 in the barrel 3
  • the spring 8 serves to eject the lead 11 through the guide tube and spring 16 serves to advance and retract the inner casing. If the spring 16 is stronger in expansion force than the spring 8, the inner casing 5 is advanced after the lead ejecting operation has been performed.
  • cylindrical member having the elongated slot 14 is provided apart from the barrel 3. But they may be formed integral with each other.
  • the push-type mechanical pencil of the embodiment of the invention is so constructed that the exposing of the fine lead guide tube 2 and the ejecting of the lead 11 through the guide tube 2 can be made respectively in turn by simply pushing the end cap 6.
  • the retracting of the inner casing 5 to conceal the guide tube into the barrel 3 is obtained by slightly rotating the end cap 6.
  • a mechanical pencil comprising a barrel opened at both ends, an inner hollow casing disposed inside of said barrel, lead advancing means having a first spring inside of said inner casing, and an end cap projecting through the rear end opening of said barrel, the improvement of said mechanical pencil comprising a fine lead guide tube at the tip of said inner casing which is slidable relative to said barrel, a first projection provided at the outer surface near the front end of said inner casing, a tubular member disposed between said barrel and said inner casing and having a hooked slot through which said first projection is guided and caught at its hooked portion, a secondspring provided around the rear cylindrical surface of said inner casing but inside of said barrel, said second spring expanding between said tubular member and a second projection provided at'the rear portion of said inner casing and urging said inner casing to the rearward direction of said barrel, and means for transmitting a pushing force applied to said end cap to said second spring, wherein said second spring is weaker in expansion force than the first spring, whereby the inner casing is advanced initially outside of the fore

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
US00104163A 1968-07-11 1971-01-05 Push-type mechanical pencil Expired - Lifetime US3713745A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP43048681A JPS4925848B1 (enrdf_load_stackoverflow) 1968-07-11 1968-07-11

Publications (1)

Publication Number Publication Date
US3713745A true US3713745A (en) 1973-01-30

Family

ID=12810047

Family Applications (1)

Application Number Title Priority Date Filing Date
US00104163A Expired - Lifetime US3713745A (en) 1968-07-11 1971-01-05 Push-type mechanical pencil

Country Status (2)

Country Link
US (1) US3713745A (enrdf_load_stackoverflow)
JP (1) JPS4925848B1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573817A (en) * 1980-07-22 1986-03-04 Platinum Pen Of America, Inc. Mechanical pencil
US5165812A (en) * 1990-10-29 1992-11-24 A. W. Faber-Castell Gmbh & Co. Lead writing instrument with selective locking of chuck

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US261455A (en) * 1882-07-18 Dorfer
US270567A (en) * 1883-01-09 Dorfer
US1355026A (en) * 1920-04-30 1920-10-05 Hamilton L Austin Shaving-brush
US2649074A (en) * 1947-06-06 1953-08-18 Ronson Art Metal Works Inc Pen construction
US3153479A (en) * 1963-01-29 1964-10-20 Eric G Hultgren Lipstick device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US261455A (en) * 1882-07-18 Dorfer
US270567A (en) * 1883-01-09 Dorfer
US1355026A (en) * 1920-04-30 1920-10-05 Hamilton L Austin Shaving-brush
US2649074A (en) * 1947-06-06 1953-08-18 Ronson Art Metal Works Inc Pen construction
US3153479A (en) * 1963-01-29 1964-10-20 Eric G Hultgren Lipstick device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573817A (en) * 1980-07-22 1986-03-04 Platinum Pen Of America, Inc. Mechanical pencil
US5165812A (en) * 1990-10-29 1992-11-24 A. W. Faber-Castell Gmbh & Co. Lead writing instrument with selective locking of chuck

Also Published As

Publication number Publication date
JPS4925848B1 (enrdf_load_stackoverflow) 1974-07-04

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