KR100289327B1 - Self-adjustment sharp pencle - Google Patents

Abstract

The present invention is automatically inserted when a certain amount of force is applied during the use of the sharp pencil to prevent the breakage of the pencil, at the same time when the pencil lead is inserted into the desk surface when the pencil lead is excessively protruded as always a certain length The self-adjustable sharp pencil that can maintain the protruding state, the sharp pencil is screwed with the rear case 30 and the rear case 30, the front guide to guide and insert the pencil lead 52 The outer cylinder 31 into which the 42 is fitted and the pencil core 52 are accommodated, and the rear end is fitted to the inner cylinder 32 into which the stopper 38 is fitted, and the front end of the inner cylinder 32 is inserted into the pencil core 52. Grip is inserted into the holder 44 having a slit hole 44a formed at the front and the outer circumference of the slit hole 44a formed at the holder 44 to temporarily release the pencil lead 52. A return spring (70) disposed in close contact with the front locking jaw (30c) formed in the front case (40) via the ring (46) and the fixing ring (46), and providing a restoring force to the inner cylinder (32). The front spring cap 48, which is housed 50, and the seam adjusting means which is disposed at the rear of the inner cylinder 32 to press the pencil core to protrude to a predetermined length, and the rear locking formed inside the rear case 30 It is restrained to be pushed backward by the jaw (30b), the front end is formed with a seating groove (36a) is fitted with a shim adjustment means and is composed of a rear spring cap 36 is covered with a stopper (38).

Description

Self-adjusting sharp pencil {SELF-ADJUSTMENT SHARP PENCLE}

The present invention relates to a self-adjusting sharp pencil, more specifically, when a force of a predetermined size or more is applied during the use of the sharp pencil is automatically inserted to prevent breakage of the pencil and at the same time protruding pencil lead excessively When pressed against the desk surface, etc., the pencil lead is inserted, and the self-adjustable sharp pencil that can always be protruded by a certain length.

The writing instrument most widely used among students or office workers is a sharp pencil that automatically supplies a thin pencil lead of about 0.5 mm to 1 mm. 1 is a cross-sectional view showing a conventional sharp pencil, the internal structure of the pencil is shown in detail.

In the conventional sharp pencil configuration, the outer cylinder 10, which is usually made of plastic, etc., and the inner cylinder 12 in which the stopper 14 is fitted at the rear end of the pencil core is stored, and the screw is connected to the front of the outer cylinder 10. And a front cap 26 having a pencil core hole 18 through which the pencil core is drawn out and inserted, a holder 20 coupled to the front of the inner cylinder 12 and holding the pencil core, and an inner cylinder through the stopper 14. Compression at the time of pressing 12) and a release spring 22 for pushing the inner cylinder 12 to return to its original position, and a spring cap 24 in close contact with the front end of the return spring 22 is pressed.

The front end of the holder 20 is usually branched into three parts, and a fixing ring 26 is fitted in this branch part. Therefore, when the inner cylinder 12 is pressed through the stopper 14, the holder 20 moves forward together with the inner cylinder 12. At this time, the fixing ring 26 is prevented from moving forward caught on the engaging end (24a) formed in the front of the spring cap 24, the branch portion is extended while the holder 20 is only advanced, the pencil core hole by a certain length Protrudes through 18.

Next, when pressing and releasing the stopper 14, the inner cylinder 12 together with the holder 20 is returned to its original position by the elastic force of the return spring 22, and the front end of the holder 20 retreats. By being inserted into and fixed to the fixing ring 26, the protruding pencil core is firmly gripped.

In the conventional self-adjustable sharp pencil having such a configuration, since the pencil lead is always firmly fixed by the fixing ring and the holder, the pencil lead is broken when an impact is applied during writing. In addition, among those unfamiliar with the sharp pencil, the pencil lead is often broken by using the pencil lead too long.

In addition, if the pencil lead protrudes too much and is adjusted to a suitable length, press the pen lead against the desk surface while pressing the stopper, and then press the stopper again to protrude the pencil lead or press it against the desk surface. You can remove your hand from the stopper when the length is projected, but this adjustment is quite difficult. In particular, the younger students are unsanitary because the length of the pencil is held in the state of holding the end of the pencil with your hand, and the pencil powder gets on your hands.

The present invention devised to solve such a problem can be inserted automatically when a certain amount of force is applied during the use of the sharp pencil to prevent the broken of the pencil, when the pencil core is excessively protruded against the desk surface The purpose is to provide a self-adjusting sharp pencil that is easy to use by pressing the pencil lead is automatically re-extruded by a certain length at all times.

1 is a cross-sectional view showing a conventional sharp pencil,

2 is an exploded perspective view showing a sharp pencil according to a first embodiment of the present invention;

3 is an assembled perspective view illustrating a sharp pencil according to a first embodiment of the present invention;

4 is a cross-sectional view showing a sharp pencil according to a first embodiment of the present invention;

5 is an exploded perspective view illustrating a sharp pencil according to a second embodiment of the present invention;

6 is a cross-sectional view showing a part of a sharp pencil according to a third embodiment of the present invention;

7 is a sectional view showing a part of a sharp pencil according to a fourth embodiment of the present invention.

♣ Explanation of symbols for main part of drawing ♣

30: rear case 32: inner tube

34: adjustment spring 36: rear spring cap

38: stopper 40: front case

42: A guide 44: Holder

44a: slit hole 46: retaining ring

48: front spring cap 50: return spring

An object of the present invention described above is screwed with the rear case and the rear case and the front tube is inserted into the guide for guiding and inserting the pencil lead in the front, and the inner tube is inserted into the stopper at the rear end to accommodate the pencil lead, It is inserted into the front end of the inner cylinder and grips the pencil lead.The front case is inserted through a holder having a slit formed at the front, a fixing ring which is inserted into the outer circumference of the slit hole formed in the holder to temporarily release the pencil lead. It is disposed in close contact with the front locking jaw formed in the interior, the front spring cap is provided with a return spring for providing a restoring force to the inner cylinder, and is disposed at the rear of the inner cylinder to press the pencil core to protrude to a predetermined length Pushed backward by the shim adjusting means and the rear locking jaw formed in the rear case It is restrained, and is achieved by a self-adjusting sharp pencil characterized in that the front end is formed with a seating groove into which the shim adjustment means are fitted, and a rear spring cap which is capped at the rear.

Hereinafter, with reference to the accompanying Figures 2 to 4 will be described in detail with respect to the self-adjusting sharp pencil according to a preferred embodiment of the present invention, the same parts as the conventional structure described in Figure 1 are denoted by the same reference numerals.

2 and 3 are exploded perspective and assembly perspective views showing a sharp pencil according to a first embodiment of the present invention, Figure 4 is a cross-sectional view showing a sharp pencil according to a first embodiment of the present invention.

Referring to the schematic configuration of the self-adjustable sharp pencil according to the present invention, the outer case 31 and the outer case 31 formed of the front case 40 and the rear case 30 are inserted into the outer case 31 and insert the pencil lead 52. An inner cylinder 32, a holder 44 and a fixing ring 46 disposed in front of the inner cylinder 32 to hold the pencil core, a return spring 50 for providing a water-resilient restoring force to the inner cylinder 32, and a pencil core It is made of a seam adjustment means for setting the protrusion amount of the pencil lead 52 while supporting the projecting, the return spring 50 and the adjustment spring 34, respectively, the front spring cap 48 and the rear spring cap 36 is It is covered.

Looking at this in more detail, a female screw 30a is formed at the front end of the rear case 30 constituting the outer cylinder 31, and a stopper 38 is inserted at the rear end to the rear end of the rear spring cap 36. To be fitted to. In the present specification, the front end refers to the side where the pencil lead is protruded and the rear end refers to the opposite side.

At the rear end of the front case 40 which is screwed to the rear case 30, a male screw 40a is formed to be fastened to the female screw 30a, and the front end guides the pencil lead 52 to protrude and insert smoothly. Guide 42 is fitted. This guide 42 is formed with a conventional pencil seam hole 42a of various diameters, and preferably made of steel or the like that is stronger than the front case 40.

The rear case 30 and the front case 40 of the present invention may be formed of the same material as plastic, and in some cases, the front case may be manufactured of steel or the like. Of course, in this case, it is possible to delete the guide of the steel material, it is possible to support so as to penetrate the pencil lead smoothly with only the pencil lead hole as in the prior art.

The internal components of the front case 40 are generally similar to conventional structures. In brief, the front end of the inner cylinder 32 is provided with a holder 44 having a slit hole 44a in which a plurality of slits are formed so as to be expandable by holding the pencil core 52. A fixing ring 46 is fitted at the front end of 44. In the usual case, the outer circumferential portion of the slit hole 44a is inserted in the fixing ring 46 to fix the pencil lead 52, and the holder 44 in the state in which the inner cylinder 32 is advanced through the stopper 38. Is moved away from the fixed ring 46. As a result, the slit hole 44a is expanded to temporarily release the fixed state of the pencil lead 52, so that the pencil lead 52 can protrude and be inserted.

A return spring 50 that provides elastic restoring force to the inner cylinder 32 is fitted in the outer circumferential portion of the holder 44, and the front end of the return spring 50 is supported by the front spring cap 48. The front spring cap 48 is disposed in close contact with the front locking jaw 30c formed in the front case 40 via the fixing ring 46. Therefore, when the return spring 50 is pressed by the inner cylinder 32 through the stopper 38, the return spring 50 is retracted by the elastic energy stored at the time of compression when the stop spring 38 is released. It is possible to return to the original position.

At the rear end of the inner cylinder 32, when excessive force is applied to the pencil core 52, the inner cylinder 32 is pushed out to prevent the pencil core 52 from being temporarily inserted and broken, Shim adjusting means for setting the protruding length is arranged. The adjustment spring 34, which is a shim adjustment means, is elastically supported by the rear spring cap 36.

Since the rear spring cap 36 is restrained from being pushed backward by the rear locking jaw 30b formed inside the rear case 30, the inner cylinder 32 and the holder 44 pressed by the return spring 50 are The pencil lead 52 is not completely inserted into the guide 42 so that it is no longer retracted. The front end of the rear spring cap 36 is formed with a seating groove 36a to which the return spring 50 is fitted, and a stopper 38 is covered on the rear to prevent the pencil lead from falling out.

In this embodiment, the adjustment spring 34 is composed of a front end (34a) fitted to the rear end of the inner cylinder 32 and a rear end (34b) inserted into the seating groove (36a) of the rear spring cap 36. It is. The amount of protrusion of the pencil lead can be set by the length l1 of the rear end 34b disposed between the rear end of the inner cylinder 32 and the seating groove 36a of the rear spring cap 36. That is, under the condition that the spring constant and the diameter are the same, as the length l1 is increased, the protruding amount of the pencil lead 52 is increased. On the contrary, as the length l1 is short, the protruding amount of the pencil lead 52 is decreased.

Here, the front end 34a of the adjustment spring 34 fitted to the rear end of the inner cylinder 32 is larger in diameter than the rear end 34b inserted into the seating groove 36a of the rear spring cap 36. It can be seen that it is formed. Therefore, it is restrained that the adjustment spring 34 is advanced beyond the predetermined depth on the outer circumferential surface of the inner cylinder 32.

In the sharp pencil of this configuration, when the user presses the stopper 38, the inner cylinder 32 is pushed through the rear spring cap 36 and the adjustment spring 34 to move forward with the holder 44. At this time, the fixing ring 46 is prevented from moving forward caught on the front latching jaw (30c) formed in the front case 40, the slit hole (44a) is extended while only the holder 44 is protruded by a guide length of a pencil lead ( Through 42).

Next, when the plug 14 is released, the inner cylinder 12 together with the holder 20 is returned to its original position by the elastic force of the return spring 22, and the front end of the holder 20 is retracted. While being inserted into and fixed to the fixing ring 26, the protruding pencil core is firmly gripped.

When a force of a predetermined size or more is applied to the protruding pencil lead 52 through this operation, the inner cylinder 32 and the holder 44 are retracted to the rear by winning the elastic force of the adjustment spring 34 by this force, This is pushed backwards. At this time, the fixing ring 46 is maintained by the state of being fitted to the outer peripheral portion of the slit hole (44a) of the holder 44 is maintained in the fixed state of the pencil lead (52).

When excessive force is applied to the pencil lead as described above, it is possible to prevent the pencil lead 52 from being inserted and broken by the adjustment spring 34, while the pencil lead 52 is excessively protruded. have. For example, when the pencil core is pressed against the desk surface or the like when it protrudes beyond the set length, the inner cylinder 32 overcomes the elastic force of the adjustment spring 34 and slightly retreats. At this time, when pressing the pencil lead 52 with further force, the pencil lead 52 supported by the holder 44 is inserted into the slit hole 44a and enters the inner cylinder 32 according to the following principle.

That is, when the pencil core 52 is pressed against the desk surface or the like, the inner cylinder 32 and the holder 44 are initially moved by the length l1 of the rear end of the inner cylinder 32 and the rear spring cap 36 as shown in FIG. 4. When pressing the outer cylinder 31 downward with the pencil lead 52 further, the inner cylinder 32 does not retreat anymore because the rear end of the inner cylinder 32 is in contact with the rear spring cap 36. As the inner cylinder 32 is pressed by the rear spring cap 36, a force is generated to move the holder 44 in front of the front, and the front end of the holder 44 is slightly separated from the fixing ring 46 by this force. At the same time the fixed state of the pencil lead 52 is temporarily released, the pencil lead 52 continues to enter the inner cylinder (32).

When the pressing stops in the state where the pencil lead 52 enters until it coincides with the surface of the guide 42, the inner cylinder 32 and the holder 44 are advanced by the length l1 by the adjustment spring 34, and the original Return to the position and the pencil lead 52 can be automatically adjusted by protruding to a predetermined size as described above.

5 is an exploded perspective view showing a sharp pencil according to a second embodiment of the present invention. Since the alternative configuration of the present embodiment is the same as the above embodiment, the same parts are denoted by the same reference numerals, and further description thereof will be omitted, and the adjustment springs are denoted by 100 plus the number.

In this embodiment, as the shim adjusting means, the front end 134a and the seating groove 36a of the rear spring cap 36 are in close contact with the stopper 33 protruding from the rear end of the inner cylinder 32. An adjustment spring 134 with a rear end 34b 'inserted is employed. By this stopper 33, it is restrained that the adjustment spring 134 advances more than a predetermined depth on the outer peripheral surface of the inner cylinder 32. As shown in FIG. Other configurations and their operation principle are the same as in the first embodiment.

6 is a cross-sectional view showing a part of a sharp pencil according to a third embodiment of the present invention. Since the general configuration of the present embodiment is the same as the above embodiment, the same parts are denoted by the same reference numerals and further description thereof will be omitted, but the adjustment spring is denoted by the number of 200 plus.

The adjustment spring 234 employed as the shim adjusting means in this embodiment has a structure that is fitted between the rear end of the inner cylinder 32 'and the rear spring cap 36'. To this end, a recess 32a 'is formed at the rear end of the inner cylinder 32' opposite to the seating groove 36a 'of the rear spring cap 36', and then the front end 234a is formed in the recess 32a. At the same time, the rear end 234b is seated in the seating groove 36a '. By having such a structure, the overall length of the adjustment spring can be reduced, and the length of the pencil lead protruding can be set more precisely by adjusting the spring coefficient. Other configurations and their operation principle are the same as in the first embodiment.

7 is a cross-sectional view showing a part of a sharp pencil according to a fourth embodiment of the present invention. Since the general configuration of the present embodiment is the same as the above embodiment, the same components are denoted by the same reference numerals, and further description thereof will be omitted, and the adjustment spring is denoted by the number of 300 plus.

The adjustment spring 334 employed as the shim adjustment means in this embodiment has a shape opposite to the adjustment spring 34 of the first embodiment. That is, the diameter of the front end 334a was formed smaller than the diameter of the rear end 334b, and the structure which inserts the front end 334a into the inside of the rear end of the inner cylinder 32 'is employ | adopted. The rear end 334b of the adjustment spring 334 is seated in the seating groove 236a 'of the rear spring cap 236'. By having such a structure, the control spring can be miniaturized. Other configurations and their operation principle are the same as in the first embodiment.

According to the present invention described above, when a force of a certain size or more is applied during the use of the sharp pencil can be automatically inserted to prevent the breakage of the pencil, the pencil lead is inserted when pressed against the desk surface when the pencil lead is excessively protruded It is always easy to use because it automatically reappears for a certain length. In addition, there is no need to hold by hand when adjusting the pencil lead as in the prior art is hygienic and there is an advantage that can prevent the breakage of the pencil lead to prevent waste of resources.

Claims (4)

An outer cylinder 31 which is screwed with the rear case 30 and the rear case 30 and in which a guide 42 for guiding the pencil lead 52 to protrude and be inserted is fitted; An inner cylinder 32 into which a stopper 38 is fitted to the rear end by storing the pencil lead 52, The holder 44 is inserted into the front end of the inner cylinder 32 to hold the pencil lead 52, the slit hole 44a is formed in the front, Fixing ring 46 is inserted into the outer peripheral portion of the slit hole (44a) formed in the holder 44 to temporarily release the pencil core 52, and Is disposed in close contact with the front locking jaw (30c) formed in the interior of the front case 40 via the fixing ring 46, the return spring 50 for providing a restoring force to the inner cylinder 32 is accommodated With front spring cap 48, And a shim adjusting means disposed at the rear of the inner cylinder 32 to press the pencil core to protrude to a predetermined length; It is restrained from being pushed backward by the rear locking jaw 30b formed in the rear case 30. A seating groove 36a into which the shim adjusting means is fitted is formed at the front end thereof, and a stopper 38 at the rear thereof. Self-adjusting sharp pencil, characterized in that consisting of the rear spring cap 36 to be covered. The method of claim 1, The shim adjusting means comprises a front end 34a fitted to the rear end of the inner cylinder 32 and a rear end 34b inserted into the seating groove 36a of the rear spring cap 36, but protruding from the pencil lead. The amount is characterized in that the adjustment spring 34 is set to the length l1 of the rear end 34b disposed between the rear end of the inner cylinder 32 and the seating groove 36a of the rear spring cap 36. Self-adjusting sharp pencil. The method of claim 2, The stopper (33) is characterized in that the stopper (33) is formed so that the front end (134a) of the adjustment spring 134 is in close contact with the rear end of the inner cylinder (32) is in close contact. The method of claim 2, The front end 234a of the adjustment spring 234 is seated in the groove 32a 'formed at the rear end of the inner cylinder 32' and the rear end 234b is the seating groove 36a 'of the rear spring cap 36'. Auto-sharp mechanical pencil, characterized in that seated on).