Fixed-nib writing instrument with a protective retractible sleeve

A technology for writing utensils and protective sleeves, applied in the directions of writing utensils, writing connectors, writing parts, etc., can solve problems such as locking failure, accidental sliding of tubular objects, etc.

Inactive Publication Date: 2009-09-23
SOC DITE SOC BIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an accidental rotational force, even a slight one, in both the extended and retracted positions of the nib, may cause the lock to fail, resulting in unintentional sliding of the tube.

Method used

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  • Fixed-nib writing instrument with a protective retractible sleeve
  • Fixed-nib writing instrument with a protective retractible sleeve
  • Fixed-nib writing instrument with a protective retractible sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Such as figure 1 As shown, when the writing instrument is in the writing position, that is, when the protective sleeve is in the retracted position, it has a rod 1 extending along the axis A direction. A second rod 7 fits and can be pressed into the tail of the rod 1 in order to protect the tail of the rod 1 and form a complete rod extending along the entire length of the appliance. Alternatively, the two rods can also be cast together to form a single rod. image 3 Details of the rod 1 are shown. Said rod 1 comprises a generally cylindrical front portion 1A, an annular middle portion 1B having a larger outer diameter, and a generally cylindrical tail portion 1C having the same outer diameter as the front portion 1A. Figure 5 The details of the protective sleeve 2 are shown. After the protective sleeve 2 is installed, it can move along the coaxial direction with the rod 1 in a helical manner, so the inner surface SI of the sleeve 2 is designed to be able to move alon...

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PUM

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Abstract

The invention relates to a fixed-nib writing instrument (6) having a shaft (1), to the front of which a protective sleeve (2) is movably fitted coaxially relative to the shaft (1), the movement of said sleeve taking place between a protective position in which it covers the writing nib and a retracted position in which it permits writing. The sleeve (2) comprises a wall portion (2A) having at least one helical guide path (20, 21) that engages with at least one stud (10, 11) connected to the shaft (1). Means of retention of the rotation of the sleeve (2) are provided to prevent the sleeve rotating at less than a certain threshold effort in the two positions of protection and retraction, and comprise at least one lengthwise rib (26, 27) suitable for engaging elastically in a first groove (16, 17) and in a second groove (16', 17') for the protective and retracted positions, respectively.

Description

technical field [0001] The present invention relates to a writing instrument with a fixed refill, which comprises a rod extending axially and a protective sleeve mounted on the front end of the rod, the protective sleeve includes an inner surface and an outer surface, so that the The sleeve can move along the axial direction of the rod, and the inner surface of the sleeve is designed so that the sleeve can slide relative to the outer surface of the front part of the rod; position; the sleeve includes a wall portion including at least one helical guide groove engaging at least one pin connected to the rod so that when the sleeve rotates The sleeve is movable between a protected position and a retracted position. Background technique [0002] This type of writing instrument is disclosed by the patent US4780016, but it has many disadvantages. In particular, its protective sleeve had to be made flexible and deformable, since the circular cross-section of the sleeve had to be f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43K24/04B43K24/06
CPCB43K24/026B43K23/12
Inventor 弗兰克·罗琳阿尔诺·毕兹
Owner SOC DITE SOC BIC
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