SU1260256A1 - Mechanical pensil - Google Patents

Description

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The invention relates to a combination of pencils with retractable slate rods in a protective sheath.

The purpose of the invention is to increase convenience in use.

In Fig 1 1 shows the auto pencil, a longitudinal section; FIG. 2 is a view along arrow A in FIG. one; on

.fig. 3 is a section BB in FIG. 2; in fig. 4 — means for cutting shells and slate rod; FIG. 5 is a view along arrow B in FIG. four.

The auto pencil contains a tubular body 1, having a cylindrical groove 2 on the outer surface, and in the central channel two symmetrically arranged longitudinal grooves 3 and 4, a nut-shaped tip 5 installed in the groove 2 of the tubular body 1 with the possibility of rotation. not relative to its axis and having an internal screw thread 6, pipes. a shell 7 made of an elastic material, for example, a polymer (soft plastic, polyethylene, vinyl chloride, polystyrene), installed in pipe kopnyce 1 with the ability to interact with screw thread 6 and i free movement in its central channel and fixed by protrusions 8, installed in slots 3 and 4, O f rotates when it interacts with screw thread 6, and means for cutting the extension of that part of the shell consisting of a spring cut ring 9 mounted on the tubular body 1

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with the possibility of removal and having at least two cantilever housing 1 arranged cantilever along the axis 1. elastic shelves 10 and 11 with an arc-shaped cutting ring 12 each. The cutting edges 2 of each of the shelves 10 and 11 are located across the axis of the tubular body 1, and their radius of curvature is equal to the inner radius of the tube 0 of the shell to prevent deformation of the slate rod installed in the shell 7. With the output of the shell 7, the tubular body I has longitudinal slits for

15 mounting nut on it tip 5.

Auto Pencil is used as follows.

Preliminarily ensuring the interaction of the screw thread 6 with the tubular sheath 7, push part of the last of the tubular body 1 on one side. Then the split ring 9 is installed on the tubular core I of I to such a position that the cutting edges 12 of the elastic shelves 10 and 11 located one opposite the other can interact with the extended part of the tubular sheath 7. The elastic shells 10 and 1 are pressed one to the other towards the other the tubular sheath 7, and then by axial movement of the cut off part, remove it from the slate rod, exposing the working end of the slate rod. Produced sharpening the bare end, the slate rod is fully prepared for work.

Vida

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Editor K. Voloshchuk

Compiled by S. Moskalev

Tehredts m Hodanich Proofreader L. Pilipenko

Order 5178/15 Circulation 345 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

uz s

Claims (1)

A car pencil containing a tubular body in which a tubular shell for a slate rod is mounted so that it can be extended from one end thereof, characterized in that, in order to improve ease of use, it has means for cutting the extended portion of the shell of the slate rod, made in the form of a spring split rings mounted on the tubular body with the possibility of removal and having at least two cantilevered along the axis of the tubular body elastic shelves with an arcuate cutting edge at each oh, while the cutting edges are located across the axis of the tubular body one against the other, and their radius of curvature is equal to the inner radius of the tubular shell to prevent deformation of the slate rod when cutting the extended part of the tubular shell.