SU1761553A1 - Collet pencil - Google Patents

Abstract

Use: to hold a graphite or carbon rod. SUMMARY OF THE INVENTION: The collet pencil comprises a body with a rod holder made in one piece in the form of elastic clamping petals and a sleeve for generating clamping force of the writing rod, with a groove on the elastic clamping petals of the rod of the holder grooved along the edges of the end ledges and having a cross-sectional square shape with rounded corners, like which a corresponding hole is made in the sleeve, while the sleeve is movably installed in the groove with the possibility of turning it around the prod Flax axis for the rod and locking frictional forces. 3 il.

Description

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The invention relates to mechanical collet sticks, in particular for holding a graphite or carbon rod.

Known collet pencil, comprising a housing, a push button and a spring-loaded rod holder, made in the form of one piece with elastic clamping petals.

The disadvantage of the design is the complexity of the fabrication of the design, the unreliability of the retention of the writing rod.

A collet pencil is also known, comprising a body with a rod holder made in one piece in the form of elastic clamping petals and a sleeve for creating a clamping force of the writing rod.

This device is selected as a prototype. The disadvantage of the design is the inconvenience of use, the complexity of manufacturing.

The aim of the invention is to improve usability and simplify manufacture.

The goal is achieved by the fact that in a pencil containing a body with a rod holder made in one piece in the form of elastic clamping petals and a sleeve for generating clamping force of the writing rod / on the elastic clamping petals of the rod holder, there is a groove bounded along the edges of the end ledges and having the cross-sectional shape of a square with rounded corners, like which a corresponding hole is made in the sleeve, while the sleeve is movably mounted in the groove with the possibility of turning it around the longitudinal XI o

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Node pin rod and fixing forces of friction.

FIG. 1 shows a pencil, side view; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section of the GG type in FIG. one.

The collet pencil comprises a housing 1 with a core holder made in the form of elastic clamping petals 2 and a sleeve 3 for creating a clamping force of the writing rod 4. The elastic holder petals 2 of the rod holder have a groove 5 bounded along the edges of the end ledges 6 and having a cross-sectional square shape with longitudinal cuts 7 and with rounded corners 8, like which a corresponding hole is made in the sleeve 3, the sleeve being movably installed in the groove 5 with the possibility of turning it around flax axis of the rod holder and friction fixing. The housing 1 can be made, for example, from plastic, and the sleeve 3 from metal.

The structures are assembled as follows. On the housing 1 without the writing rod 4, they put the sleeve 3 on the bottom, while compressing the elastic clamping petals 2, the end ledges 6 will not allow the sleeve 3 to slide up or down. In the position B of the sleeve 3 (FIG. 2), it does not compress the petals 2, therefore, the writing rod 4 can be freely inserted into the housing 1 or BbiHVTb from it. If the sleeve 3 is rotated at an angle of 45 ° relative to the vertical axis of the housing 1, then the petals 2 will compress to

pin 4 and its retention in a given working position by friction forces, because the diagonal of the square shape of the longitudinal section of the rod holder between the end ledges 6 is greater than the distance between the inner walls of the sleeve 3. To release the writing rod 4, you must turn the sleeve 3 from position B to position B. (Fig. 2).

Claims (1)

Increased ease of use is achieved by quickly fixing the rod into the working position by simply turning the sleeve with fingers, and simplification in manufacturing is achieved due to the presence of only two simple parts manufactured at the press machines and their elementary assembly. Claims of the Invention A collet pencil comprising a body with an integral rod holder in the form of elastic clamping petals and a sleeve for creating a clamping force of the writing rod, characterized in that, in order to improve ease of use and simplify manufacture, the elastic holder rods a groove is made, limited at the edges by end ledges and having a cross-sectional shape of a square with rounded corners, like which a corresponding hole is made in the sleeve, while ulka mounted movably in a bore rotatably around its longitudinal axis and fixing strezhnederzhatel frictional forces. R R J -; V / 7 3 & g. g