JPS6224548Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention is a multi-core device that selectively supplies any core to a lead gripping device by rotating a core storage member that stores multiple cores. Regarding chamber-type writing instruments,
More specifically, it is possible to prevent as much as possible the breakage of the lead that would occur if a lead selection operation is performed while the lead supplied from the lead storage member is inserted into the lead gripping device and the lead storage member. The present invention relates to a multi-core chamber type writing instrument.

(Prior art and its problems) A multi-lead chamber type writing instrument in which an arbitrary lead can be selectively supplied to a lead gripping device by rotating a lead storage member that stores a plurality of leads was developed in 1973.
As disclosed in Publication No. 7175, a lead holder for gripping the lead is placed behind a stopper fixed in the tip of the rectangular tube and is biased by a spring stretched between the stopper and the stopper. A lead storage unit having a plurality of lead storage units is arranged behind the lead holder, and a knob operating unit is fitted to the rear of the lead storage unit via a spring and a cam body so as to be able to slide freely and rotate together. There is a known device in which the lead storage body is rotated by rotating a knob operating part, and the chuck claw of the lead holder is opened by pushing in the knob operating part.

However, with the structure described above, although it is possible to selectively supply the lead to the lead holder, if the lead storage body is rotated by mistake and the lead selection operation is performed while the lead is being supplied to the lead holder, A lead whose rear portion is located within the lead storage portion of the lead storage body has a problem in that it may break due to the shearing force exerted by the rear end of the lead holder and the rotating front end of the lead storage body.

(Purpose of the invention) The present invention has been developed in view of the above-mentioned conventional problems, and is caused by incorrect selection of the lead when the lead supplied from the lead storage member is inserted into the lead gripping device and the lead storage member. To provide a multi-core chamber type writing instrument whose core does not break even when operated.

(Structure of the invention) The invention will be described in detail below based on examples.

In FIG. 1, reference numeral 1 is a cylindrical main body, and a hole 5 is formed at the tip of the main body 1 at a position eccentric to the axis of the main body 1. The base of the collect chuck 2, which is divided into a plurality of parts and can be opened and closed, is fixed by screwing or press fitting. Reference numeral 3 denotes a chuck actuating tube that is slidably fitted onto the main body 1 and the collector chuck 2, and the chuck actuating tube 3 is attached to the front by an elastic member 4 such as a spring stretched between it and the main body 1. The collector chuck 2 is normally closed by pressing the front end opening into pressure contact with the expanded distal end portion of the collector chuck 2. As shown in FIG. 2, 7 is a core storage member having a plurality of radial storage chambers 6 for storing the cores A on its outer peripheral surface, and the core storage member 7 is rotatably arranged within the main body 1. . Reference numeral 8 denotes a locking device that locks the rear end portion of the core storage member 7 by friction, and the locking device 8 includes a rear member 9 that is rotatably arranged with respect to the main body 1, and a rear end portion of the core storage member 7. a friction member 10 facing the rear end surface, and the friction member 10
and the rear member 9.
It is comprised of a resilient member 11 made of a spring or the like that presses the front end surface of the core storage member 7 into contact with the rear end surface of the lead storage member 7. Reference numeral 12 denotes a conical protrusion provided on the core storage member 7, and the protrusion 12 contacts the front inner wall 13 of the main body 1 to rotatably support one end of the core storage member 7. Preferably, in order to prevent the axis of the core storage member 7 and the axis of the main body 1 from being misaligned, a recess is provided in the inner wall 13 to fit and support the protrusion 12.

Next, the operation of the present invention will be explained.

First, the operations from selecting a desired core to supplying it to the collection chuck 2 will be explained. First, by rotating the rear member 9 relative to the main body 1, the elastic member 11 and the friction member 10 interposed in front of the rear member 9, and the core storage member 7 that is frictionally engaged with the friction member 10, are attached to the main body 1. Then, the storage chamber 6 in which the desired core A is stored is aligned with the hole 5. Thereafter, by turning the tip of the main body 1 downward, the desired lead A will fall into the collection chuck 2 under its own weight. At this time, the collection chuck 2 is closed by pressure contact of the chuck actuating tube 3 which is urged forward by the elastic member 4, so that the core A
is temporarily stopped near the tip of the collect chuck 2, but if the chuck actuating tube 3 is now slid rearward with respect to the main body 1 and the collect chuck 2 is expanded, the core A is projected outward from the collect chuck 2. After the core A has protruded a desired length in this way, if the backward sliding of the chuck operating tube 3 is released and the chuck operating tube 3 is returned, the collect chuck 2 is closed again, so that the core A is It is gripped by the collector chuck 2 and can be written on. In order to store the protruding lead A in the storage chamber 6, after pointing the tip of the main body 1 upward, slide the chuck actuating tube 3 backward with respect to the main body 1, and then open the collect chuck 2.
All you have to do is expand it and release the grip on core A.

Next, as shown in FIG. 1, while the lead A supplied from the lead storage member 7 is inserted into the collection chuck 2 and the storage chamber 6 of the lead storage member 7, the rear member 9 is rotated relative to the main body 1. The effect when this is done will be explained. When the rear member 9 is rotated relative to the main body 1 in the state shown in FIG. Storage member 7
The rear member 9 also attempts to rotate together with the rear member 9. When the lead storage member 7 is rotated with respect to the main body 1 in this state, the lead A will be broken near the front end of the lead storage member 7, but the lead storage member 7 will have its rear end facing away from the friction member 1.
When a predetermined rotational force is applied to the core storage member 8, the locking force due to friction is released and the core A can be rotated. When force is applied, slippage occurs at the frictional locking portion, and only the locking device 8 is attached to the main body 1.
Since the core storage chamber 7 is prevented from rotating while applying a certain amount of shearing force to the core A, breakage of the core A can be prevented. The frictional locking force between the locking device 8 and the lead storage member 7 can be appropriately set in accordance with the breakage strength of the lead, such as by selecting the elastic force of the resilient member 11.

(Effects of the invention) As described above, according to the present invention, it is possible to appropriately select the core to be stored in the main body and supply it to the collect chuck. Even if this selection operation is performed, breakage of the core or destruction of component parts can be prevented as much as possible, which is a great practical effect.

Incidentally, examples of the lead used in the present invention include a pencil lead, a refill for a ballpoint pen, and the like.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a view showing the core storage member when cut along the - line in FIG. 1. 1...Main body, 2...Collection chuck, 3...
Chuck operating tube, 4... Resilient member, 6... Storage chamber, 7... Core storage member, 8... Locking device, 10...
...Friction member, 11... Resilience member.

Claims (1)

[Scope of utility model registration request] A main body equipped with a collector chuck that can be opened and closed eccentrically with respect to the axis; a chuck operating tube that is slidably fitted onto the main body and the collet chuck and can close the collet chuck at a front end opening; the chuck operating tube an elastic member stretched between the body and the main body; a core storage member rotatably disposed within the main body behind the collector chuck and having a plurality of storage chambers; a core storage member rotatably disposed at the rear end of the main body; The locking device is composed of a rear member arranged therein and a friction member that is urged forward by an elastic member stretched between the rear member and presses against the core storage member, and the core is held in place. This multi-core chamber type writing instrument is configured to release the friction locking force between the friction member and the lead storage member when the rear member is rotated while being inserted into the storage chamber of the collection chuck and the lead storage member.