JP2547641Y2 - Sharp pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a mechanical pencil in which a knocking operation unit for extending a lead is provided on a side surface of a barrel and a rear end of the barrel.

(Prior Art) Conventionally, a mechanical pencil having both a knock cylinder protruding from the rear end of a barrel and a side knock button mounted on a side part of the barrel to draw out the core is disclosed in, for example, Japanese Utility Model Publication No. 52-12489. It is publicly known by a gazette or the like.

(Problems to be Solved by the Invention) In the above conventional mechanical pencil, when the knock cylinder is knocked, the side knock button also sinks into the inside of the shaft cylinder, and when the side knock button is knocked, the knock cylinder also advances. There was useless movement. Since the unnecessary operation of such parts may cause a failure, the present invention has no such unnecessary movement, that is, when the knock cylinder is knocked, the side knock button does not sink into the shaft cylinder, Another object of the present invention is to provide a mechanical pencil in which a knock cylinder does not advance when a side knock button is knocked.

(Means for Solving the Problems) A mechanical pencil according to the present invention as a first means for solving the above problems is a centering chuck 1 and a knocking operation of a side knock button 2 connected to the centering chuck 1. A group of parts that can be integrally operated by the knock cylinder 3 and a group of parts connected to the knock cylinder 3 can be independently advanced with respect to the knock cylinder 3 and a group of parts connected to the knock cylinder 3, and a group of parts connected to the knock cylinder 3 and the knock cylinder 3 When the side knock button 2 is mounted on the inner edge of the window hole 5 of the barrel 4 on which the side knock button 2 is mounted so that the side knock button 2 can be protruded and retracted, the side knock button 2 A spring 6a for biasing and pressing is provided.

The mechanical pencil according to the present invention, which is a second means for solving the above-mentioned problem, is integrally operated by the centering chuck 1 and the knocking of the side knock button 2 connected to the centering chuck 1. When the group of parts to be moved can be independently advanced with respect to the knock cylinder 3 and the group of parts connected to the knock cylinder 3, and the group of parts connected to the knock cylinder 3 and the knock cylinder 3 are advanced. Are mounted in a separated state so that they can be moved forward together with them, and the side knock button 2 is mounted at the position inside the window hole 5 in which the side knock button 2 is mounted so as to be able to protrude and retract.
A spring 6b for biasing and supporting the outer side of the spring.

(Effect) The mechanical pencil of the present invention firstly includes a center feeding chuck 1 and a group of parts (hereinafter referred to as a center feeding chuck and the like) which are connected to the center feeding chuck 1 and are integrally operated by a knock operation of the side knock button 2. ) Is assembled to the knock cylinder 3 and a group of parts connected to the knock cylinder 3 (hereinafter referred to as a knock cylinder or the like) in a separated state so that the knock cylinder 3 can move forward independently. The knock cylinder and the like do not operate at all even if the lead is pulled out by moving the feed chuck or the like forward. Next, when the knocking cylinder 3 is knocked, the core feeding chuck and the like are assembled in a separated state so as to be able to advance integrally with the knocking cylinder and the like. At this time, the side knock button 2 is urged by the spring 6a to be pressed against the inner edge of the window hole 5 of the barrel 4, or urged outward by the spring 6b to support the window hole 5. Therefore, the side knock button 2 does not sink into the window hole 5.

(Example) Hereinafter, an example is described based on a drawing.

First, FIGS. 1 to 4 relate to an embodiment of the present invention. The barrel 4 has an opening at the rear end, a base 7 screwed into the front end, and an elongated window hole 5 near the place where the fingertip of the index finger is located when gripped by hand for writing. The window hole 5
Side knock button 2 is mounted on the vehicle. Side knock button 2
As shown in FIG. 2, each of the legs 2a has leg pieces 2a projecting inward at both ends in the width direction, has a downward U-shape in cross-sectional shape, and has a locking rib 2b on the outer surface of the distal end edge of the leg piece 2a. A notch step 2c is provided at the rear end corner of the leg piece 2a. The side knock button 2 inserts the leg piece 2a into the window hole 5 and inserts the notch step 2c into the window hole 5.
And the front end is swingable inward and outward of the window hole 5 by using the hooked portion as a fulcrum, and the hooking rib 2b is attached to the side inner edge on both sides of the window hole 5. To prevent falling out of the window hole 5. The base 7 has a core guide pipe 8 at the front end.
And a center detent chuck 9 is fitted at a position behind the center guide pipe 8 inside. A chuck cover 11 is fixed at an internal position extending from the base 7 to the front end of the barrel 4, and the center feeding chuck 1 is inserted therein. The center feeding chuck 1 protrudes the center holding portion at the front end to the front of the chuck cover 11 and fits a tightening ring 12 on the outer periphery thereof. A slider 13 is connected to the rear end to connect the slider 13 to the chuck cover 11. It is urged rearward by a chuck spring 14 interposed therebetween. Slider 13 has an inclined surface at the rear end
13a, the inclined surface 13a is arranged corresponding to the front end of the window hole 5 of the shaft cylinder 4 so that the front end corner of the leg 2a of the side knock button 2 can be abutted. Behind the slider 13, a small-diameter relay pipe 14 that can pass between the leg pieces 2a of the side knock button 2
The lead case 15 is connected via the. A flange 15a protrudes from the outer peripheral surface of the front end of the core case 15, and a coil-shaped spring 6a is interposed between the flange 15a and the rear end surface of the leg 2a of the side knock button 2. The leg piece 2a is urged forward.
Is in contact with the front inner edge 5b of the window hole 5 of the shaft cylinder 4. An inner cylinder 16 is disposed inside the rear end of the barrel 4 so as to be movable in a required range in the axial direction in a state where the inner cylinder 16 is prevented from coming off by a projection 4a which is provided on the inner surface of the barrel 4 in a circumferential manner. At the rear end of the inner cylinder 16, an eraser receiver 18 with a removable rubber 17 is joined, and a knock cylinder 3 for covering the eraser 17 is removably fitted to the outer periphery of the rubber eraser 18, and the eraser receiver 18 and the shaft Projection of cylinder 4
A coil spring 19 and the like (a group of components consisting of the knock cylinder 3, the rubber eraser receiver 18, the rubber eraser 17 and the inner cylinder 16) are urged rearward with a coil spring 19 interposed therebetween. The rear end of the core case 15 is inserted into the front end cylindrical portion 16a of the inner cylinder 16, but keeps the separated state from the inner cylinder 16, and the rear end of the core case 15 is slightly different from the inner surface step 16b of the inner cylinder 16. Facing each other with a small gap.

First, when the lead is extended by operating the side knock button 2, the front end of the side knock button 2 is pressed inward of the barrel 4 as shown in FIG. Rear end slope of slider 13
13a is pushed by the front end corner of the leg piece 2a of the side knock button 2, so that a center feeding chuck or the like (a group of components including the center feeding chuck 1, the slider 13, the relay pipe 14, and the core case 15) moves forward to remove the core. Roll out. At this time, lead case 15
And the inner cylinder 16 is separated, so that the knock cylinder 3 does not move forward.

Next, when the core is extended by operating the knock cylinder 3 at the rear end, the knock cylinder 3 is pushed forward as shown in FIG.
When the inner surface step 16b of 16 is brought into contact with the rear end edge of the lead case 15 and further pressed, knock pressure is transmitted to the lead feed chuck or the like and the lead is fed. At this time, since the front end surface of the leg piece 2a of the side knock button 2 is in contact with the front inner edge 5a of the window hole 5 of the shaft cylinder 4 due to the force of the spring 6b, the side knock button 2 enters the window hole 5. There is no.

FIG. 5 relates to another embodiment of the present invention. In the above embodiment, a spring for biasing the side knock button 2
Although the rear end of 6a is supported by the flange 15a of the core case 15, in the present embodiment, the rear end of the spring 6a is supported by the inner surface step 4b provided on the barrel 4. Other structures are the same as the above embodiment.

Next, FIGS. 6 and 7 relate to an embodiment of the present invention. A plate-shaped spring 6b bent in a mountain shape is disposed at a position corresponding to the window hole 5 in the barrel 4, and the leg 2a of the side knock button 2 is placed on the top of the mountain to support the side knock button 2. It is urged outward from the hole 5. A cutout groove 10 through which the relay pipe 14 can be inserted is formed at the center in the width direction of the spring 6b. Other structures are the same as the above embodiment. When the slider 13 moves forward and the trailing end inclined surface 13a separates from the leg 2a of the side knock button 2, the side knock button 2 does not
Since it is supported by 6b, it cannot be immersed inside the window hole 5.

(Effects of the Invention) As described above, the present invention prevents the side knock button from immersing in the shaft cylinder when operating the knock cylinder arranged at the rear end of the shaft cylinder and extending the lead. When the button is operated to extend the lead, the knock cylinder can be prevented from moving forward, and unnecessary movement of parts can be eliminated.

[Brief description of the drawings]

1 to 4 relate to a first embodiment of the invention according to claim 1, wherein FIG. 1 is an overall vertical sectional view showing a state in which a core is not extended, and FIG. FIG. 3 is a partial vertical cross-sectional view when the core is extended by the side knock button, and FIG. 4 is a general vertical cross-sectional view when the core is extended by the knock cylinder. FIG. 5 is a longitudinal sectional view of a main part according to a second embodiment of the present invention. 6 and 7 relate to an embodiment of the invention as claimed in claim 2, FIG. 6 is a longitudinal sectional view of a main part, and FIG. 7 is a perspective view of a spring. 1 ... lead feeding chuck, 2 ... side knock button, 3 ...
Knock cylinder, 4 ... shaft cylinder, 5 ... window hole, 6a, 6b ... spring,
13 ... slider, 14 ... relay pipe, 15 ... core case, 16 ... inner cylinder, 17 ... eraser, 18 ... eraser receiver.

Claims (2)

(57) [Scope of request for utility model registration] A knock-out cylinder and a group of parts connected to the knock-out cylinder and connected to the knock-out cylinder. When the knock cylinder 3 and a group of parts connected to the knock cylinder 3 are allowed to advance independently with respect to the parts, and the knock cylinder 3 and a group of parts connected to the knock cylinder 3 are assembled together, they are assembled in a separated state so as to be able to advance integrally with them. A mechanical pencil characterized in that a spring 6a for biasing and pressing the side knock button 2 is provided on the inner edge of the window hole 5 of the barrel 4 in which the side knock button 2 is mounted so as to be able to protrude and retract. 2. A knocking cylinder 3 and a group of parts which are connected to the core feeding chuck 1 and which are integrally operated by a knocking operation of a side knock button 2 are connected to the knocking cylinder 3 and a group of the knocking cylinder 3 connected thereto. When the knock cylinder 3 and a group of parts connected to the knock cylinder 3 are allowed to advance independently with respect to the parts, and the knock cylinder 3 and a group of parts connected to the knock cylinder 3 are assembled together, they are assembled in a separated state so as to be able to advance integrally with them. A mechanical pencil is provided with a spring (6b) for biasing and supporting the side knock button (2) toward the outside of the window hole (5) at an inner position of the window hole (5) in which the side knock button (2) is removably mounted.