JPH0585690U - Feed-out type eraser device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to provide an erasing device for a writing instrument that is suitable for writing and erasing frequently. An inner cylinder 10 having a slit 12 at the rear, a crown portion 11 at the rear end, and a shaft portion 17 at the front is attached to the inner hole of a cap 4 having a spiral groove 5 in the inner hole. On the other hand, the cap is provided so as to be rotatable and axially movable within an appropriate range, and the eraser holder 20 having the eraser 22 fixed to the inner cylinder can be moved back and forth. Each of them is fitted, the shaft part of the inner cylinder is joined integrally with the front shaft 1 in the rotational direction, and when the cap is at the rear position with respect to the inner cylinder, the cap is rotated with respect to the front shaft to erase the eraser behind the crown. It is possible to retract from the end, and by moving the cap forward with respect to the inner cylinder from the state where the eraser protrudes an appropriate amount, the front shaft and the cap are stopped from rotating and the rear end of the eraser can retract from the rear end of the crown. And

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a so-called feed-out type eraser device, which is arranged at the rear end of a writing instrument and which feeds out an eraser by rotating.

[0002]

[Prior Art]

 Conventionally, there is known a mechanical pencil in which a cap is rotated with respect to a front shaft to extend a large-diameter eraser from the rear end, and a rear end is knocked against the front shaft to extend a lead. However, since this product knocks the rear end as the core wears out, there is the trouble of storing the protruding eraser in the cap when knocking when writing or deleting frequently. (If you knock in the protruding state, your fingers may become dirty or the oil on your eraser may transfer to the end surface of the eraser rubber, resulting in poor erasability.)

[0003]

[Problems to be solved by the device]

 The present invention aims to solve the problems of the conventional example.

[0004]

[Means for Solving the Problems]

 The erasing device of the present invention devised in order to achieve the above-mentioned object is provided with a slit at the rear and a crown at the rear end in the inner hole of a cap having a spiral groove in the inner hole. An inner cylinder with a shaft is attached, the cap is rotatable with respect to the inner cylinder and axially movable within an appropriate range, and an eraser holder with an eraser fixed to the inner cylinder is movable back and forth. The projections provided on the side surface are fitted into the slit and the spiral groove, respectively, and the shaft part of the inner cylinder is integrally joined with the front shaft in the rotation direction.When the cap is rotated with respect to the front shaft, the eraser is attached to the rear part of the crown. The rear end of the eraser can be retracted from the rear end of the crown by moving the cap forward while the eraser is properly protruding from the rear end of the crown.

[0005]

Embodiment FIG. 1 and FIG. 2 show an embodiment of the present invention. First, the feed-out type eraser device is configured by combining the members of the cap 4, the inner cylinder 10 and the eraser holder 20, and the cap 4 is formed of the inner hole and the inner hole which are fitted on the outer periphery of the rear end of the front shaft 1 in the forward direction. The rear inner wall has a plurality of ribs 8 to be fitted in a vertical groove 19 at the rear of the front shaft 1, which will be described later, and a step 6 having a protrusion 7 at the end of the inner hole is formed, and further at the inner surface of the rear hole. A spiral groove 5 is formed, and a clip 9 is provided on the outer peripheral side surface. The inner cylinder 10 also has a hole through which the eraser 22 is inserted, and a crown portion 11 that abuts the rear end surface of the cap 4 at the rear end, and a long slit 12 is formed from approximately the center to the crown portion. There is. In addition, there is a shaft portion 17 which is integrally engaged with the rear end hole of the front shaft 1 in the rotation direction at the front side, and the shaft case 17 has an inner hole which is appropriately fixed to the lead case 2 of the mechanical pencil. A mating groove 18 is provided, and further, a partition portion 16 that comes into contact with the rear end of the core case 2 is provided. Further, a collar portion 15 and a groove 14 and a groove 13 are formed further rearward on the outer periphery of the shaft portion 17 at the rear side. Further, the eraser holder 20 has a bottomed hole portion for fixing the rear end of the eraser 22 to the rear end, and a protrusion 21 is provided on the outer peripheral portion of the tip.

The eraser holder 20 is elastically fitted from the slit 12 of the inner cylinder 10, the protrusion 21 is fitted into the slit, and the inner cylinder 10 is inserted from the rear end of the cap 4 into the spiral groove 5. While being inserted, the brim portion 15 is positioned forward of the step portion 6 of the cap 4 by elastic deformation, and the projecting portion 7 is provided with the crown portion 11 in contact with the rear end of the cap 4. The groove 13 is positioned so as to engage the groove 13 with appropriate resistance. That is, the cap 4 is rotatable and axially movable with respect to the inner cylinder 10 between the crown portion 11 and the flange portion 15 and is prevented from coming off. Further, the eraser 22 is fixed to the rear end of the eraser holder 20, the shaft portion 17 of the inner cylinder is prevented from rotating in the rear end hole of the front shaft 1, and further fixed to the lead case 2.

By the way, a writing element of a mechanical pencil is provided in front of the tip shaft 1 so as to extend the lead in association with the forward and backward movement of the lead case 2. The description of the structure is omitted because it is not the gist of the present invention. Further, in the embodiment of the present invention, the feed-out type eraser device provided at the rear end of the sharp pencil writing tool is shown. It At that time, instead of the eraser, a solid correction agent that can erase the ballpoint pen ink is attached. If a rubber latex type erasable ballpoint pen is used, an eraser is attached.

[0008]

[Action]

 First, when the cap 4 is rotated to the left or right with respect to the front shaft 1 in the state shown in FIG. 1, the eraser 22 appears and disappears from the rear end hole of the crown portion 11. When the cap 4 is moved forward with respect to the tip shaft 1 with the eraser 22 properly projected as shown in FIG. 1, the projection 7 of the cap and the groove 13 of the shaft 17 are disengaged, and the step 6 is removed. The projection 7 engages with the groove 14 while contacting the brim portion 15, and the rear end of the eraser 22 is recessed in the rear end hole of the crown portion 11 as shown in FIG. At that time, the rib 8 of the cap is fitted (comb-like) into the longitudinal groove 19 at the rear of the front shaft so as to be movable only in the axial direction. In this state, if the rear end of the crown 11 is knocked, the core can be drawn out, and there is no inconvenience that the cap 4 is accidentally rotated with respect to the front shaft 1 and the eraser 22 is drawn out when knocked. By the way, the engagement between the projection 7 of the cap and the grooves 14 and 13 of the inner cylinder is not an essential condition, but it is preferable to provide it for stable operation. At this time, it is preferable that the engagement / disengagement resistance is set to a weak level such that the core case 2 is not pressed and the core is not extended.

[0009]

[Effect of the device]

 The construction and operation of the feeding type eraser device of the present invention are as described above, and since an appropriate amount of the eraser can be retracted and retracted just by sliding the cap on the tip shaft, it is possible to write or erase as in the conventional case. Eliminates the hassle of rotating the cap many times with respect to the front axle at frequent times.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a feed-out type eraser device according to an embodiment of the present invention, in which a cap is located rearward and an appropriate amount of the eraser is projected.

FIG. 2 is a vertical cross-sectional view of a main portion showing a state in which a cap is located at the front and an eraser is depressed.

[Explanation of symbols]

 1 Tip Shaft 2 Core Case 3 Engagement Protrusion 4 Cap 5 Spiral Groove 6 Step 7 Protrusion 8 Rib 9 Clip 10 Inner Cylinder 11 Crown Crown 12 Slit 13 Groove 14 Groove 15 Flange 16 Partition 17 Shaft 18 Engagement Groove 19 Vertical groove 20 Eraser holder 21 Protrusion 22 Eraser

Claims (1)

[Scope of utility model registration request] 1. A feed-out type eraser device disposed at a rear end of a front shaft having a writing portion at a tip thereof, wherein the feed-out type eraser device has an inner hole of a cap having a spiral groove. An inner cylinder having a slit at the rear and a crown portion at the rear end and a shaft at the front is attached to the inner cylinder, and the cap is rotatable relative to the inner cylinder and axially movable within an appropriate range. An eraser holder with an eraser fixed in the inner hole of the cylinder can be moved back and forth. When joined and the cap is in the rear position with respect to the inner cylinder, the eraser can emerge from the rear end of the crown when the cap is rotated with respect to the front shaft, and the eraser appropriately protrudes from the rear end of the crown. When the cap is moved forward with respect to the inner cylinder from the state In addition, the rear end of the eraser is recessed from the rear end of the crown portion, and the mutual rotation is stopped between the inner hole portion of the cap front side and the outer peripheral portion of the rear end of the front shaft. Type eraser device.