Leadholder or Related Patent
date of application
patent holder country
1931 December 12, No. 34,612/31
1932 October 20
Friedrich Wilhelm Haack, Germany
|patent employed on||
I, Friedrich Wilhelm Haack, of Winterfeldstrasse, 23, Berlin W. 57, Germany, a citizen of the German Republic, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:—
This invention relates to a pencil having a lead which can be shifted and fixed by means of a slidable sleeve engaging the barrel. These pencils consist of a barrel with longitudinal slot, in which the lead is movably situated; the lead is fastened on an arm projecting from the longitudinal slot. This arm terminates in a slidable sleeve, surrounding the barrel, said sleeve enabling the lead to he shifted from the outer side. The object of the invention is to secure the sliding sleeve in any desired position.
For this purpose, it has been proposed to use round keys which project from a square hole of the rotatable ring encircling the slidable sleeve. Other constructions show, instead of the square hole, a groove in the rotatable ring, which on being turned is pushed over the key and thereby clamps the sleeve with the arm engaging laterally through the longitudinal slot of the pencil and carrying the lead. In these devices the key is soon pressed flat and worn down, besides which the square hole or groove soon widens so that often, after being used a certain time, the slidable sleeve is no longer clamped, with the lead moved thereby.
This objection is overcome, according to the invention, in that at the sides of the slot in the pencil barrel, clamping cheeks are provided, which are formed by folding of the flaps forming part of the beaded member which bears the lead holder, and that the fixing ring has an eccentric bore portion, with which it engages over the clamping cheeks, one of which is wedged against the pencil barrel on the ring being turned to the right or to the left. The folded portions of the flaps preferably directed outwards may be provided with projections.
An embodiment of the invention is illustrated by way of example in the accompanying drawing in which:
Fig. 1 shows the double sided beaded band with the lead holder in perspective view;
Fig. 2 is an end view or the eccentric adjusting ring;
Fig. 3 is a section on line A—B of fig. 2;
Fig. 4 shows a section on line C—D of fig. 5;
Fig. 5 shows the pencil in elevation.
a is the adjusting ring slidable on the pencil barrel b having a slot b'. An eccentric bore c is provided in said ring. Between the pencil barrel b and the adjusting ring a, a double winged beaded member d, e with flaps f is situated in the slot b'. The edges of the flaps f are folded outwards on their whole length so that they form clamping cheeks g provided with projections g' or the like. The clamping cheeks g engage in the eccentric bore c of the ring a. The joint between the flaps f and the clamping cheeks g is smooth on the inner side of the adjusting ring a. In the rounded portion d of the beaded member is fitted the helical holding band i for the lead. A short sleeve k engages the helical lead holder and has at the front end an inwardly directed tooth l engaging the coils of the helical member. The sleeve k being shiftable along the helical member its tooth l acts to drive the lead end portion out from the holder and also forms a stop for engaging a new lead in the holder.
By turning the adjusting ring a to the right or to the left, one of the clamping cheeks g is pressed against the pencil barrel b so that the adjusting ring and thereby the pencil is clamped.
Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:—
1.—A pencil, comprising a pencil barrel having a longitudinal slot and a beaded member bearing a helical lead bolder and movably secured in the barrel, characterized by the provision of flaps on said member which are folded on their entire length to form clamping cheeks at the sides of said slot, and an adjusting ring having an eccentric bore engaging with said clamping cheeks, one of said cheeks being secured on the lateral turning of said ring to the right or to the left to wedge against said pencil barrel.
2.—A pencil as claimed in claim 1, characterized by the fact that the flaps are folded outwards and provided with projections or the like.
3.—A pencil as claimed in claims 1 and 2, characterized by the fact that a sleeve engages the helical lead holder and has a tooth engaging the coils of the helical member for the purpose set forth. Dated this 12th day of December, 1931.
COPE & Co.,
Redhill: Printed for His Majesty's Stationery Office, by Leve & Malcomson, Ltd.—1932.