DE2010105C

DE2010105C - Injection mold for pencil sharpeners

Info

Publication number: DE2010105C
Application number: DE19702010105
Authority: DE
Inventors: Der Anmelder Ist
Original assignee: Fischer, Ernst, 8521 Braunings hof
Filing date: 1970-03-04
Publication date: 1973-04-26

Description

des Gewindes erforderlichen Drehmoment und dem 50 Fig. 2 denselben Bleistiftspitzer mit dem besondenötigen Anzugsmoment der Schraube nur gering ist ren Schieber nach der Erfindung im Querschnitt ge- und bei ausreichend festem Sitz der Schraube das Ge- maß Linie H-II der Fig. 1, während die restlichen winde im Spitzergehäuse stark gefährdet ist und oft Teile der Spritzgußform als hier weniger wesentlich auszureißen pflegt. nur durch Dreipunkt-Strich-oder nur durch gestri-of the thread required torque and the 50 Fig. 2 the same pencil sharpener with the special one Tightening torque of the screw is only low ren slide according to the invention in cross section and if the screw is seated firmly enough, the dimension line H-II in FIG. 1, while the rest Winde in the sharpener housing is at great risk and often parts of the injection mold are less important than here tends to tear away. only with a three-dot line - or only with a dashed line

Bei Verwendung von Hohlnieten für das Festhal- 55 chelte Linien angedeutet sind.When using hollow rivets, lines are indicated for holding on.

ten der Spitzermesser kann zwar auch bei einem F i g. 1 läßt erkennen, daß außer den üblichen vierTh of the sharpener knife can indeed also with a F i g. 1 shows that in addition to the usual four

Kunststoffgehäuse kein Gewinde ausreißen, weil ja Seitenwänden 1 bis 4 und der konischen Schaftfühfür die Niete nur eine einfache Bohrung im Gehäuse rung 5 für einen Schreibstift sowie dem Messer 6 noch nötig ist, aber hier ist selbst bei Verwendung von ein nach der Außenwand 3 hin gehender Steg 7 vorge-Hohlnieten mit sehr breitem Flansch an dem einen 60 sehen ist, in welchem beim Spritzen der der Schneide 8 Ende nicht zu vermeiden, daß sich beim Feslbördeln des Messers 6 gegenüberliegende breite Längsrand 9 des anderen Endes der Hohlniete nur ein schmaler in seinem Mittelteil eingebettet wird. Die Enden 10 Bördelrand bildet, der sich mehr oder weniger in die und Il des Messers 6 werden von Vorsprüngen des Oberfläche des Spitzergehäuses eindrückt und keine unteren Formteiles 12 gehalten, welcher lediglich Gewähr für den festen Halt des Messers gibt. 65 durch eine gestrichelte Linie 13 in F i g. 2 angedeutetPlastic housing do not tear the thread, because of the side walls 1 to 4 and the conical shaft guide the rivet just a simple hole in the housing tion 5 for a pen and the knife 6 yet is necessary, but even when using a web 7 going towards the outer wall 3, pre-hollow rivets are used here with a very wide flange on which one 60 can be seen, in which the cutting edge 8 End not to avoid that when flanging the knife 6 opposite wide longitudinal edge 9 of the other end of the hollow rivet only a narrow one is embedded in its central part. The ends 10 Flanged edge forms, which is more or less in the and Il of the knife 6 are of the projections Surface of the sharpener housing and no lower molded part 12 held, which only Ensures that the knife is held firmly in place. 65 by a dashed line 13 in FIG. 2 indicated

Schließlich ist bei einem in einer schlitzförmigen ist.Finally, one is in a slot-shaped one.

Aussparung des Spitzergehäuses festgeklemmten Während des Spritzvorganges liegt auf der oberenRecess of the sharpener housing clamped during the spraying process lies on the upper one

Messer wegen der unvermeidbaren Toleranz desMes- Abflachung 14 des Kerns 15 ein senkrecht dazu an-Knife because of the unavoidable tolerance of the measuring flat 14 of the core 15 a perpendicular to it

geordneter zweiter Kern 16 auf, der in F i g. 2 voll geschnitten dargestellt, in Fig. 1 aber nur durch eine lkii d hordered second core 16, which is shown in FIG. 2 shown in full section, in Fig. 1 but only by one lkii d h

Strich-Doppelpunkt-linie und von unten gesehen an- den des Messers auf ^v°^rSP""^B _d Dash-colon line and, seen from below, at the ^{edge of} ^{the knife on v} ° rS P "" ^B _d

gedeutet ist, und es wird nach der Erfindung die Ober- teiles 12 links und rechts von oem - _ ^is interpreted, and it is according to the invention the upper part 12 left and right of oem - _ ^

feitedesMessersevonderSchneideSanbiszurMes- 5 Mit der Smch-Drexpunk^Lune ^r |feitedesMessersevonderSchneideSanbiszurMes- 5 With the Smch-Drexpunk ^ Lune ^ r |

ermine, von den Oberflächen einer Aussoarune 17 obere Teil 18 der Spritzgußform angeaeuermine, from the surfaces of an Aussoarune 17 upper part 18 of the injection mold

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 21 2

serbandstahles especially with minus tolerances Patent claim: no reliable work of the knife to be expected.

In addition, the

Injection mold for pencil sharpeners, with a correct work of the pencil sharpener from the clean conical core in the upper mold part for the 5 attachment of the knife back to the intended manufacture of the shaft guide for a pencil, surface of the sharpener housing, which is only characterized by the fact that the koni- monitoring in the factory and not when working from home see core (15) above (14) is flattened and with is enough. Even if, however, an attempt is made in the factory to rest against this flattening on a second core (16) which can be moved perpendicularly to it by checking the assembly and to achieve the correct position of the knife, this also assumes that the length of the knife ( 6) and a cut-out the knives show an unusually high dimensional accuracy (17) for the reception of the cutting, but this is only due to the very high-quality fer-edge (8) of the knife, while that of the processing machines and due to the elimination of the not Cut opposite wide longitudinal edge (9) to achieve dimensionally accurate knife. By spraying the back of the knife in a molded web (7) 15 casting mold according to the invention it is ensured that between the conical shaft guide (S) and the cutting edge of the knife is embedded regardless of any outer wall (3) of the sharpener and that there are precise tolerances the correct point of the remaining part (10, 11) of the knife from the lower sharpener housing and in this position also remains part (12) of the injection mold from below and from which and that these advantages are also maintained with automatic ready-made side. ao supply and if the screw is omitted to save

can be achieved by assembly costs.
The invention is based on the object of a

Creating an injection mold for a pencil sharpener,

the costly manual labor for assembling the Mesas sers on the casting is superfluous and still one absolutely reliable operation of the ready-to-use

The invention relates to an injection mold for leads to ensure spitzers.

pencil sharpener, with a conical core in the upper The object is thereby achieved according to the invention

Molded part for the production of the shaft guide for solves that in an injection mold for a pencil a pencil. 30 sharpeners with a conical core in the upper A pencil sharpener with a single knife and a shaped shaft part for the production of the shaft guide for a pencil guide, as is well known, only a pencil works; Flattening on a perpendicular to it, rests on the intended surface of the sharpener movable second core, which rests the length of the housing cleanly and in this position also has a safe 35 of the knife and a recess for which is held. The known types of fastening of receiving the cutting edge of the knife beMesser by screwing, riveting or inserting it, while the long edge of the knife back, which is opposite the cutting edge, is a slot-shaped recess in the sharpener housing and only inadequately fulfills these requirements. There is an injected bar between the conical shaft guide ζ. B. a secure hold down of the knife by 40 and the outer wall of the sharpener is embedded and a screw is only guaranteed if the remaining part of the knife from the lower part of the sharpener housing is made of metal. As a result, however, the injection mold is held at the bottom and from the side.
the price of a pencil sharpener increased significantly. If the drawing shows the essential parts here, the sharpener housing made of plastic, then screws, an injection mold according to the invention and a ben are used, which screw themselves into a pencil sharpener made with it, for example, and a narrow bore in the sharpener housing, on an enlarged scale again, namely shows
to press. However, it is not always possible for F i g. 1 to ensure a sufficiently tight fit of the screw with the injection mold after the ereinen, find the pencil sharpener made from below, the difference between the one to be pressed in and