FR3073776A1 - PENCIL HOLDER FOR PENCIL AND PENCIL, GUM, AND GUN HOLDER ASSEMBLY - Google Patents

Abstract

An axially extending pencil eraser holder (10) having an inner cavity extending in the axial direction (A) and having a first holding portion configured to hold a pencil ( 12) and a second holding portion configured to hold an eraser (14), the inner cavity being through so that one end of the pencil (12) is adapted to abut against one end of the eraser (14) when the pencil (12) and the eraser (14) are held in the eraser holder (10). The invention also relates to a set of a pencil (12), an eraser (14) and a rubber holder (10).

Description

BACKGROUND OF THE INVENTION The present disclosure relates to an eraser holder for pencil.

There is known a rubber erased on the non-cut end of a pencil by means of a metal ring or an eraser held by tightening a ring of plastic material welded to the pencil or on the non-cut end of the pencil.

However, when these erasers are worn, it is not always possible to replace the eraser and / or, when the pencil is worn, to replace the pencil. Thus, when the eraser is used, the pencil is used without eraser or when the pencil is worn, the pencil is thrown away with the eraser.

In addition, the volume of the eraser which can be crimped onto the pencil is generally limited.

Also, there is a need for a device for renewing the eraser, for a device that can be used on different pencils and / or for a device for having a large volume eraser.

OBJECT AND SUMMARY OF THE INVENTION The present description aims to remedy these drawbacks at least in part.

For this purpose, the present disclosure relates to a pencil eraser holder extending in an axial direction comprising an internal cavity extending in the axial direction and comprising a first holding portion configured to hold a pencil and a second holding portion configured to hold an eraser, the internal cavity being through so that one end of the pencil is capable of abutting against one end of the eraser when the pencil and the eraser are held in the eraser holder.

The eraser holder comprising a first holding portion configured to hold the pencil and a second holding portion configured to hold the eraser, the eraser holder can be mounted on different pencils and receive different erasers. In other words, when the eraser is used up, the eraser can be replaced by a new eraser and the user can continue to use the pencil held in the eraser holder. Likewise, when the pencil is worn out, the pencil can be replaced by a new pencil and the user can continue to use the eraser held in the eraser holder. It is therefore understood that the eraser holder is not mounted in a non-removable manner on the pencil and that the eraser is not mounted in a non-removable manner in the eraser holder.

The eraser holder is a unique piece.

In addition, the cavity is through. When the pencil and the eraser are held in the pencil holder, the rear end of the pencil, i.e. an end opposite to a sharpened end of the pencil which is the end of the pencil used for writing, can be in contact with the eraser, that is to say, can come into abutment against the eraser and conversely, the eraser can come into abutment against the pencil. It is understood that this end can also be cut.

Thus, the internal cavity can be of relatively large volume, the internal cavity can receive a gum having a large volume in comparison for example with the standard gum volume of a gum crimped by a metal ring.

In addition, when the pencil is in abutment against the eraser, when a force is exerted on the pencil to push it against the eraser, the eraser is pushed towards the outside of the internal cavity of the holder. It is therefore possible, by pushing the pencil inside the internal cavity of the eraser holder, for example by a translational movement in the axial direction of the eraser holder, to remove the eraser from the eraser holder.

In some embodiments, the end of the pencil held in the eraser holder is an uncut end.

In some embodiments, the end of the pencil held in the eraser holder is a cut end.

In some embodiments, the holding portion of the pencil comprises a helical thread.

The helical thread makes it possible to transform a movement of rotation of the pencil relative to the eraser holder, or of the eraser holder relative to the pencil, around the axial direction of the eraser holder, in a translational movement of the pencil by relative to the eraser holder, or the eraser holder relative to the pencil, according to the axial direction of the eraser holder. The helical thread thus makes it possible to adapt a length of the rear end of the pencil maintained in the axial direction in the eraser holder. Thus, when an eraser is held in the second holding portion, the rear end of the pencil can abut against the eraser and transmit the translational movement in the axial direction of the pencil relative to the eraser holder and thus push the eraser outside the internal cavity using the pencil.

In some embodiments, the helical thread has a triangular section.

This embodiment of the thread allows the helical thread to penetrate the pencil to ensure effective retention of the pencil in the eraser holder while allowing reduced effort on the part of the user to rotate the pencil and the eraser holder relative to each other around the axial direction. The triangular section is seen in a section plane comprising a central axis of the eraser holder, this central axis being parallel to the axial direction of the eraser holder.

In some embodiments, the helical thread has a pitch of 3 mm (millimeter).

Thus, when the pencil is rotated relative to the holder for a full turn, that is to say 360 °, the pencil can bring about 3 mm of eraser out of the internal cavity.

In some embodiments, a cylinder inscribed in the helical thread is a right circular cylinder.

In some embodiments, the inscribed diameter of the helical thread is greater than or equal to 93% of the diameter circumscribed in pencil that the eraser holder is configured to maintain, preferably greater than or equal to 94% and less than or equal to 98.6% of the diameter circumscribed in pencil that the eraser holder is configured to maintain, preferably less than or equal to 98%.

By inscribed diameter of the helical thread is meant the diameter of the right circular cylinder inscribed in the helical thread. By circumscribed diameter of the pencil is meant the diameter of the circle circumscribed to a section of the pencil, the section being taken in a plane perpendicular to the axial direction of the pencil, that is to say the diameter of the circle in which the pencil is registered. It is understood that the circumscribed diameter can also be the diameter of the right circular cylinder circumscribed in pencil. Indeed, the pencil may not be a straight circular cylinder. It can for example have a hexagonal or oval section.

In some embodiments, a length of the first holding portion in the axial direction is greater than or equal to 6 mm, preferably greater than or equal to 8 mm.

In some embodiments, a length of the second holding portion in the axial direction is greater than or equal to 8 mm, preferably greater than or equal to 9 mm.

In some embodiments, a cylinder registered in the second holding portion is a straight cylinder, for example a right circular cylinder.

In some embodiments, the second holding portion has an inscribed diameter greater than or equal to 98% of the diameter circumscribed to the gum that the eraser holder is configured to maintain and less than or equal to 99% of the circumscribed diameter to the eraser that the eraser holder is configured to hold.

In some embodiments, the second holding portion has an inscribed diameter configured so that the force in the axial direction to extract the eraser from the eraser holder is less than or equal to 15 N (newton), preferably less than or equal to 10 N and greater than or equal to 3 N, preferably greater than or equal to 5 N.

The tensile test is carried out on a tensile testing machine.

In some embodiments, the eraser holder includes a window extending in the axial direction.

This window allows you to see the eraser in the eraser holder and to see the volume of eraser remaining in the eraser holder.

In some embodiments, the eraser holder includes more than one window extending in the axial direction. For example, the eraser holder may include two windows extending in the axial direction.

In some embodiments, the eraser holder includes a clip.

It is thus possible to attach reversibly, the pencil with the clip on a block of sheets of paper, on a shirt pocket, or any other support that can be inserted between the clip and the holder, when the pencil is held in the eraser holder.

The present presentation also relates to a set of a pencil, an eraser and an eraser holder as defined above, the pencil and the eraser being held in the eraser holder.

In some embodiments of the assembly, the eraser is in abutment against the pencil.

Brief Description of the Drawings Other characteristics and advantages of the invention will emerge from the following description of embodiments of the invention, given by way of nonlimiting examples, with reference to the appended figures, in which:

- Figure 1 is a perspective view of an eraser holder according to the description with a pencil and an eraser;

- Figures 2 and 3 are perspective views of the eraser holder of Figure 1;

- Figures 4A and 4B are sectional views along the plane IVA-IVA of the eraser holder of Figure 2 and according to the plane IVB-IVB of the eraser holder of Figure 3, respectively;

- Figure 5 is an enlarged partial view V of Figure 4A;

- Figure 6A is a sectional view along the plane VIA-VIA of Figure 1;

- Figure 6B is a sectional view, similar to the view of Figure 6A, the pencil and the eraser having been used.

Detailed description of the invention Figure 1 is a perspective view of an eraser holder 10 for pencil mounted on a pencil 12 in the form of a right circular cylinder having a circumscribed diameter D12 and comprising an eraser 14 in the form of right circular cylinder having a circumscribed diameter D14.

It is understood that the pencil 12 could be in the form of a straight cylinder whose base is not a circle. For example, the pencil could be in the shape of a straight cylinder with a hexagonal base or an oval base. Similarly, the eraser 14 could be in the form of a straight cylinder 5, the base of which is not a circle.

When the right cylinder is not circular, we speak of circumscribed diameter, that is to say that we take a circular right cylinder in which the right cylinder is registered and we take the diameter of this cylinder circular right circumscribed to the right cylinder whose base is not circular. When the cylinder is a right circular cylinder, the diameter and the circumscribed diameter are equal and one will speak for simplicity of circumscribed diameter whether the right cylinder is circular or not.

Figures 2 and 3 show the eraser holder 10 for pencil, extending along the axis A, representing the axial direction. The eraser holder 15 10 comprises a barrel 16 of cylindrical shape extending along the axis A.

In the embodiment of Figures 1 to 6B, the eraser holder 10 comprises a clip 18 and a window 20 also extending along the axis A.

The barrel 16 has an internal through cavity 22 extending 20 along the axis A. The internal cavity 22 leads to a first opening 22A for holding the rod 12 and to a second opening 22B for holding the eraser 14. The barrel 16, and therefore the eraser holder 10, comprises a first holding portion 24 of the pencil 12 and a second holding portion 26 of the eraser 14.

In the embodiment of the figures, the internal cavity 22 has, in a plane perpendicular to the axis A, a section of circular shape. The outer surface of the eraser holder 10 has a hexagonal section towards the first opening 22A and a circular section towards the second opening 22B. It will be understood that the shape of the external surface is given by way of nonlimiting example.

As shown in Figures 4A and 4B, the first holding portion 24 has, on an internal surface 22C of the internal cavity 22, a helical thread 28. As shown in Figure 5, which is a partial view V enlarged in Figure 4A, the helical thread 28 has a triangular section. The triangular section is seen in a cutting plane comprising Tax A of the eraser holder 10, like the cutting plane IVA-IVA of FIG. 2, the cutting plane IVB-IVB of FIG. 3 or the cutting plane VIA- VIA in Figure 1 for example. The triangular section has an edge oriented towards Tax A of the internal cavity 22 so that the helical thread 28 can penetrate the pencil 12 in order to ensure effective retention of the pencil 12 in the eraser holder 10 while allowing reduced effort. on the part of the user to rotate the pencil 12 and the eraser holder 10 relative to each other about the axis A, as shown in the enlargement of the first holding portion 24 of Figure 6A.

The first holding portion 24 has a length L24 in the axial direction, that is to say in the direction parallel to the axis A. The length L24 of the first holding portion is measured between an inner end 28A and an outer end 28B of the helical thread 28.

The helical thread 28 of the first holding portion 24 has an inscribed diameter D28 which is less than the circumscribed diameter D12 of the pencil.

Note that in Figures 4A, 4B and 5, the inner end 28A and the outer end 28B of the helical thread 28 are not included in the same cutting plane comprising the axis A. This could of course be the case.

Note that, in the embodiment in particular of Figures 4A, 4B and 5, the eraser holder 10 has a guide surface 30 of the pencil 12 in the first holding portion24. The guide surface 30 is disposed on the side of the first opening 22A and is of frustoconical shape. The guide surface 30 is generally not part of the first holding portion 24.

As shown in Figures 4A, 4B and on the enlargement of the second holding portion 26 of Figure 6A, the second holding portion 26 has a straight circular cylindrical shape whose diameter D26 is less than the circumscribed diameter D14 gum 14 when the gum 14 is free from all external constraints. The second holding portion 26 has a length L26 in the axial direction, that is to say in the direction parallel to the axis A.

The eraser holder 10 has a guide surface 32 of the eraser 14 in the second holding portion 26. The guide surface 32 is disposed on the side of the second opening 22B and is of frustoconical shape. The guide surface 30 is generally not part of the first holding portion 24.

Note that the diameter D22 of the internal cavity 22 in a central portion 22D is greater than the circumscribed diameter D12 of the pencil 12 and the circumscribed diameter D14 of the eraser 14. The central portion 22D has a length L22D and is between the first holding portion 24 and the second holding portion 26. The diameter D22 can vary slightly, in particular to take account of the release constraints of the eraser holder 10, the diameter D22 can also be constant. Thus, apart from in the first holding portion 24 and in the second holding portion 26, the pencil 12 and the eraser 14 are not mechanically tightened in a radial direction R by the holder 10. It is understood that the radial direction R is the direction of the rays of a circle located in a plane perpendicular to the axis A and passing through this axis A.

As shown in Figure 1, the eraser holder 10 allows to receive and maintain a pencil 12 and an eraser 14. The pencil 12 is held in the first holding portion 24 by an uncut end 12A and the eraser 14 is held in the second holding portion 26. The uncut end 12A is the opposite end to a cut end 12B of the pencil 12. It is understood that the cut end 12B is an end of the pencil which allows the user to write with the pencil 12. As shown in the enlargement of FIG. 1, the window 20 of the eraser holder 10 makes it possible to see the quantity of eraser 14 present in the eraser holder 10. It can also be seen that the pencil 12 is in abutment against the rubber 14 and vice versa. However, the pencil 12 and the eraser 14 could be held in the eraser holder 10 without the pencil 12 abutting against the eraser 14. Furthermore, the end of the pencil 12 held in the eraser holder 10 can also be a cut end 12B of the pencil 12, the pencil 12 possibly comprising two cut ends 12B.

The eraser 14 can be inserted into the eraser holder 10 through the second opening 22B so that only a short length L14E, corresponding to a few millimeters, for example 2 mm, of the eraser 14 protrudes from the eraser holder 10. As shown in FIG. 6A, it can be seen that the length L14I of the eraser 14 which is received in the eraser holder 10 can be relatively large compared to the length L14E protruding from the eraser holder 10. It is understood that the eraser 14 is held in the eraser holder 10 by radial mechanical tightening exerted by the second holding portion 26 on the eraser 14.

The pencil 12 is inserted into the eraser holder 10 through the first opening 22A. For example, when the first holding portion 24 comprises a helical thread such as the helical thread 28, the uncut end 12A of the pencil 12 is inserted into the first opening 22A of the internal cavity 22 of the eraser holder 10. The pencil 12 is rotated about the axis A and the helical thread 28 "bites" into the pencil 12, that is to say that the helical thread 28 enters the pencil

12. Due to the shape of the helical thread 28, the movement of rotation of the pencil 12 relative to the eraser holder 10 comprises a translational movement along the axis A of the pencil 12 relative to the eraser holder 10. By turning the pencil 12 relative to the eraser holder 10, the pencil 12 is advanced inside the internal cavity 22 of the eraser holder 10. The pencil 12 is thus advanced in the eraser holder 10 until the pencil 12 comes into abutment against the eraser 14.

After using the eraser 14 and when the LME length of the eraser 14 protruding from the eraser holder 10 is reduced so that the use of the eraser 14 is no longer easy, the pencil can be rotated 12 relative to the eraser holder 10. The pencil 12 being in abutment against the eraser 14, the translational movement towards the inside of the internal cavity 22 of the pencil 12 along the axis A is transmitted to the eraser 14. The pencil 12 therefore pushes the eraser 14 towards the outside of the internal cavity 22. When the length L14E of the eraser 14 protruding from the eraser holder 10 is considered to be satisfactory, the rotation of the pencil 12 is stopped relative to the eraser holder 10.

The window 20 of the eraser holder 10 makes it possible to control the volume of eraser 14 remaining in the eraser holder 10.

Figure 6B is a view similar to Figure 6A in which the total length L14 of the eraser 14 and the total length L12 of the pencil 12 of Figure 6B are respectively less than the total length L14 of the eraser 14 and the total length L12 of the pencil 12 of FIG. 6A. It is understood that between these two figures, the pencil 12 and the eraser 14 were used.

The total length L12 of the pencil 12 is equal to the sum of the length L12I of the pencil 12 which is inside the internal cavity 22 and the length L12E of the pencil which projects out of the eraser holder 10. Similarly, the total length L14 of the eraser 14 is equal to the sum of the length L14I of the eraser 14 which is inside the internal cavity 22 and the length L14E of the eraser 14 which protrudes out of the carrier 10.

When the pencil 12 and / or the eraser 14 are too worn, it is possible to replace the pencil 12 and / or the eraser 14 with a new pencil 12 and / or a new eraser.

For example, a length L10 of the eraser holder 10 is equal to 40 mm, the length L24 of the first holding portion 24 is equal to 8.5 mm and the length L26 of the second holding portion 26 is equal at 9.7 mm, the inscribed diameter D28 of the helical thread 28 of the first holding portion 24 is equal to 7.15 mm and the inscribed diameter D26 of the second holding portion 26 is equal to 7.25 +/- 0.025 mm . Furthermore, the helical thread 28 can have a pitch of 3 mm. This step is given for information only, it is not limiting. The pencil 12 can have a circumscribed diameter D12 equal to 7.45 mm and the eraser 14 can have a circumscribed diameter D14 equal to 7.35 mm. Thus, the inscribed diameter D28 of the helical thread 28 is equal to 95.97% (= (7.15 / 7.45) * 100) of the circumscribed diameter D12 in pencil and the inscribed diameter D26 of the second holding portion is equal at 98.64% (= (7.25 / 7.35) * 100) of the circumscribed diameter D14 with the rubber 14. Taking these dimensions into account, the force in the axial direction, that is to say a parallel direction to axis A, required to extract the rubber 14 from the holder 10 is equal to approximately 8 N (the request was to provide a plausible value with the dimensions of the example).

It is noted that the eraser 14 may have a volume greater than a standard volume of an eraser set on a pencil. Indeed, the standard volume of an eraser crimped onto a pencil is approximately 365 mm ³ while the volume of the eraser 14 can be for example approximately 1230 mm ³ .

Although the present description has been described with reference to a specific embodiment, it is obvious that various modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the 5 claims. In addition, individual features of the various embodiments discussed can be combined in additional embodiments. Therefore, the description and the drawings should be considered in an illustrative rather than restrictive sense.

Claims (13)

1. Eraser holder (10) for pencil extending in an axial direction (A) comprising an internal cavity (22) extending in the direction 5 axial (A) and comprising a first holding portion (24) configured to hold a pencil (12) and a second holding portion (26) configured to hold an eraser (14), the internal cavity (22) being through so that one end (12A, 12B) of the pencil (12) is able to abut against one end of the eraser (14) when the pencil 10 (12) and the eraser (14) are held in the eraser holder (10). 2. Eraser holder (10) according to claim 1, wherein the first holding portion (24) comprises a helical thread (28). 3. Eraser holder (10) according to claim 2, wherein the helical thread (28) has a triangular section. 15 4. Eraser holder (10) according to claim 2 or 3, wherein the helical thread (28) has a pitch of 3 mm. 5. Eraser holder (10) according to any one of claims 2 to 4, in which the inscribed diameter (D28) of the helical thread (28) is greater than or equal to 93% of the circumscribed diameter (D12) in pencil (12 ) than The eraser holder (10) is configured to maintain, preferably greater than or equal to 94% and less than or equal to 98.6% of the circumscribed diameter (D12) in pencil (12), that the eraser holder (10) is configured to maintain, preferably less than or equal to 98%. 6. Eraser holder (10) according to any one of claims 1 25 to 5, wherein a length (L24) of the first holding portion (24) in the axial direction (A) is greater than or equal to 6 mm , preferably greater than or equal to 8 mm. 7. eraser holder (10) according to any one of claims 1 to 6, wherein a length (L26) of the second holding portion 30 (26) in the axial direction (A) is greater than or equal to 8 mm, preferably greater than or equal to 9 mm. 8. Eraser holder (10) according to any one of claims 1 to 7, in which the second holding portion (26) has an inscribed diameter (D26) greater than or equal to 98% of the circumscribed diameter 35 (D14) to the eraser (14) that the eraser holder (10) is configured to maintain and less than or equal to 99% of the circumscribed diameter (D14) to the eraser (14) that the eraser holder (10) is configured to maintain. 9. eraser holder (10) according to any one of claims 1 to 8, wherein the second holding portion (26) has a 5 inscribed diameter (D26) configured so that the force in the axial direction (A) to extract the eraser (14) from the eraser holder (10) is less than or equal to 15 N, preferably less than or equal to 10 N and greater than or equal to 3 N, preferably greater than or equal to 5 N. 10. Eraser holder (10) according to any one of claims 1 10 to 9, comprising a window (20) extending in the axial direction (A). 11. Eraser holder (10) according to any one of claims 1 to 10, comprising a clip (18). 12. Set of a pencil (12), an eraser (14) and an eraser holder (10) according to any one of the preceding claims, the 15 pencil (12) and the eraser (14) being held in the eraser holder, the eraser (14) being in abutment against the pencil (12).