CH305893A - Method for fixing tubes in a plastic mass. - Google Patents
Method for fixing tubes in a plastic mass.Info
- Publication number
- CH305893A CH305893A CH305893DA CH305893A CH 305893 A CH305893 A CH 305893A CH 305893D A CH305893D A CH 305893DA CH 305893 A CH305893 A CH 305893A
- Authority
- CH
- Switzerland
- Prior art keywords
- plastic
- mandrel
- tube
- driven
- needle
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
- B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
- B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
- B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
- B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7544—Injection needles, syringes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
Verfahren zum Befestigen von Röhrchen in eine Kunststoffmasse.
Die Erfindung betrifft ein Verfahren zum Befestigen von Röhrchen in eine Kunststoffmasse.
Das erfindungsgemässe Verfahren ist dadurch gekennzeichnet, dass das Röhrchen auf einen seiner Öffnung entsprechenden Dorn aufgestedft wird, der aus dem Röhrchen herausragt, dass vorerst dieser Dorn allein in den Kunststoff hineingetrieben wird und in ihm eine Öffnung bildet, und dass dann bei weiterem Vortreiben des Dornes das Röhrchen in diese Öffnung eingetrieben wird, ohne dabei Material aus dem Kunststoff zu entfernen, so dass das Röhrchen unter Spannung im Kunststoff festsitzt, worauf der Dorn aus dem Röhrchen herausgezogen wird.
Ein Ausführungsbeispiel der Erfindung wird im folgenden an Hand der beigefügten Zeichnungen beschrieben, von denen
Fig. 1 eine Draufsicht auf einen Teil eines Injektionsspritzenkörpers vor dem Einbringen der Nadel ist,
Fig. 2 eine ähnliche Ansicht wie Fig. 1 ist, aus der der erste Schritt zum Einführen der Nadel ersichtlich ist,
Fig. 3 eine ähnliche Ansicht wie Fig. 2 ist, die einen weiteren Schritt bei der Einführung der Nadel zeigt,
Fig. 4 eine ähnliche Ansieht wie Fig. 3, jedoch bei entferntem Dorn, ist,
Fig. 5 eine weitere Ausführung einer Spritze zeigt, bei der die Nadel nach dem Verfahren eingebaut worden ist.
In den Zeichnungen ist die Kunststoff- spritze als Ganzes mit der Bezugszahl 10 bezeichnet. Die Spritze besteht aus einem zylindrisch ausgehöhlten Teil 11, in dem ein hier nicht gezeigter Kolben bewegt werden kann.
Der zylindrische Teil 11 besitzt einen Ansatz 13. Die Teile 11 und 13 bestehen vorzugsweise aus Polyäthylenkunststoff. Die Nadel wird in den Ansatz 13 und in das obere Ende des Teils 11 eingeführt. Dies geschieht in folgender Weise:
Die hohle Nadel wird zuerst an ihrem untern Ende 14 abgeschrägt, und ein Dorn 15, dessen C grösse so gewählt ist, dass er gerade noch in die hohle Nadel eingeführt werden kann und der an seinem Ende 16 scharf zugespitzt ist, wird bereitgehalten. Dieser Dorn besitzt eine solche Länge, dass er, nachdem er in die Nadel eingebracht ist, noch über der Nadel heraussteht. Beim Eintreiben des Dornes bildet sich im Ansatz eine kleine Öffnung, und das diese Öffnung umgebende Material wird nach aussen gedrückt.
Es hat sich gezeigt, dass bei diesem Vorgang der Dorn kein Material aus dem Ansatz entfernt, sondern nur das Material auseinanderdrückt. Wenn man den Dorn weiter in den Ansatz hineintreibt, tritt die Nadel selbst in die von dem Dorn gebildete Öffnung ein, wobei ebenfalls kein Material entfernt, sondern nur die Öffnung erweitert wird, wie dies aus Fig. 3 ersichtlich ist. Darauf wird der Dorn ganz durch die Wandung des Teils 11 hindurch getrieben (siehe Fig. 3), und die Nadel kann dann entweder in der in Fig. 3 und Fig. 4 gezeigten Stellung verbleiben, in der ihr Ende nicht bis in den Hohlraum des Teils 11 vorgetrieben ist, oder sie kann ganz durch die Wand des Teils 11 hindurchgetrieben werden, wie Fig. 5 zeigt.
In beiden Fällen wird nach dem Eintreiben von Dorn und Nadel der Dorn wieder herausgezogen, während die Nadel in dem Kunststoff verbleibt. Selbst wenn die Nadel nicht vollständig durch den Kunststoff hindurchgetrieben wird, erweist es sich als unnötig, einen Verbindungskanal zwischen Nadel und dem Hohlraum im Innern des Teils 11 unter Entfernen von Material herauszuarbeiten, da, wie in Fig. 4 gezeigt, bei Poly äthylenkunststoffen eine kleine bleibende Formänderung eintritt, so dass der : Kanal 17 nach dem Herausnehmen des Dornes sich nicht gänzlich schliessen wird. Bei dieser Ausfüh- rnngsart liegt die Nadel an einer Schulter 18 an und wird dadurch zusätzlich abgestützt.
Eine nach diesem Verfahren eingebaute Nadel bleibt durch die Elastizität des auseinandergedrückten Kunststoffes fest in diesem eingebettet.
Obwohl im vorhergehenden ein bei der Herstellung von billigen Spritzen verwendetes Verfahren zum Befestigen von Hohlnadeln in Kunststoff beschrieben wurde, kann ein solches Verfahren naturgemäss auch anderweitig verwendet werden, wo Röhrchen anderer Art in Kunststoff eingebettet werden sollen.
Method for fixing tubes in a plastic mass.
The invention relates to a method for fastening small tubes in a plastic compound.
The method according to the invention is characterized in that the tube is pounded onto a mandrel corresponding to its opening, which protrudes from the small tube, that for the time being this mandrel alone is driven into the plastic and forms an opening in it, and that then as the mandrel is advanced further the tube is driven into this opening without removing material from the plastic, so that the tube is stuck under tension in the plastic, whereupon the mandrel is pulled out of the tube.
An embodiment of the invention is described below with reference to the accompanying drawings, of which
Fig. 1 is a plan view of part of a syringe body prior to insertion of the needle;
Fig. 2 is a view similar to Fig. 1 showing the first step in inserting the needle;
Fig. 3 is a view similar to Fig. 2 showing a further step in the insertion of the needle;
Fig. 4 is a view similar to Fig. 3, but with the mandrel removed,
Fig. 5 shows another embodiment of a syringe in which the needle has been installed after the method.
In the drawings, the plastic syringe is designated as a whole by the reference number 10. The syringe consists of a cylindrically hollowed-out part 11 in which a plunger, not shown here, can be moved.
The cylindrical part 11 has a projection 13. The parts 11 and 13 are preferably made of polyethylene plastic. The needle is inserted into the hub 13 and into the upper end of the part 11. This is done in the following way:
The hollow needle is first beveled at its lower end 14, and a mandrel 15, the C size of which is selected so that it can just be inserted into the hollow needle and which is sharply pointed at its end 16, is kept ready. This mandrel has such a length that, after it has been introduced into the needle, it still protrudes above the needle. When the mandrel is driven in, a small opening is formed in the approach and the material surrounding this opening is pressed outwards.
It has been shown that in this process the mandrel does not remove any material from the attachment, but only presses the material apart. If the mandrel is driven further into the extension, the needle itself enters the opening formed by the mandrel, likewise no material being removed, but only the opening being widened, as can be seen from FIG. The mandrel is then driven right through the wall of the part 11 (see FIG. 3), and the needle can either remain in the position shown in FIGS. 3 and 4, in which its end does not extend into the cavity of the Part 11 is driven, or it can be driven right through the wall of part 11, as shown in FIG.
In both cases, after the mandrel and needle have been driven in, the mandrel is pulled out again while the needle remains in the plastic. Even if the needle is not completely driven through the plastic, it turns out to be unnecessary to work out a connecting channel between the needle and the cavity in the interior of the part 11 by removing material, since, as shown in FIG permanent change in shape occurs, so that the: channel 17 will not close completely after removing the mandrel. In this embodiment, the needle rests on a shoulder 18 and is thereby additionally supported.
A needle installed according to this method remains firmly embedded in the plastic due to the elasticity of the pressed apart plastic.
Although a method used in the production of cheap syringes for fastening hollow needles in plastic was described above, such a method can naturally also be used elsewhere, where tubes of other types are to be embedded in plastic.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US305893XA | 1951-07-09 | 1951-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH305893A true CH305893A (en) | 1955-03-15 |
Family
ID=21854931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH305893D CH305893A (en) | 1951-07-09 | 1952-02-29 | Method for fixing tubes in a plastic mass. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH305893A (en) |
-
1952
- 1952-02-29 CH CH305893D patent/CH305893A/en unknown
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