DE2826350C2 - Device for mounting a collet in the shaft of a mechanical pencil - Google Patents

Description

daily situation,

F i g. 4 shows a section through the preassembled lead pen and the shell parts outside the writing instrument shaft and

5 shows a side view of the feed chute with the shell part arranged therein.

The push-button-operated mechanical lead pen that can be mounted with the device according to the invention consists, as can be seen in FIG. 1, of a shaft 1, at the front end of which an inwardly pointing support collar 2 is formed a guide hole a clamping ring 4, which is longitudinally movable by a certain amount between the support collar 2 and a stop collar in the writing instrument tip 3 From the rear, a compression spring 5 rests on the support collar 2, which, as is known, exerts the closing force on the collet which is made of the shell parts 6, which lie against one another at the separating surfaces 7 and each have a collet head 8 at their front end, which is formed on a collet neck 9 at the parting surfaces 7 abutting one another Form collet.

The device for assembling the above-described mechanical pencil consists essentially of a first one Half-round slide 10 and a second half-round slide 11, the cross-section of which is in the pen shaft penetrating area corresponds to the cross section of the shell parts 6. The half-round slides 10, 11 are axially displaceable to each other, the amount of their longitudinal mobility by a stop pin 1! 2 and an elongated hole 13 is limited. Two guide bearings 14 hold the semicircular slides 10, 11 together and allow a longitudinal mobility. The longitudinal movement is achieved by means of a lifting device with a constant stroke generated, which engages a connecting pin 16 of a control head 15. In this control head 15 is the first Half-round slide 10 fastened by means of a spring 18, while the second half-round slide 11 is stationary there is inserted with a fastening pin 17. To the shell parts 6 fed from a feed chute 20 the, to achieve a bias strongly diverging trained front parts - consisting of the The collet head 8 and the collet neck 9 - to be able to be inserted into the shaft 1 are additional flat slides 19 are provided, which are movable towards the separating surface 7 of the shell parts 6. With a larger diameter of the shaft 1 and the shell parts 6 and constant dimensions of the collet head 8 this flat slide 19 can also be dispensed with. The distance between the collet heads 8 must not be be larger than the inner diameter of the bore of the shaft 1.

The key point is the insertion of the shell parts 6 into the shaft 1 and into the bore of the clamping ring 4 of the assembly step to be carried out with the device according to the invention. It is important that the shell parts 6 outside the shaft 1 already at their separating tubes 7 aiicmaiiueigcicgi and around at least the length of the collet head 8 plus the width of the clamping ring 4 offset in the longitudinal direction in front of the Shank 1 are brought up.

With this arrangement, the two shell parts 6 can also be fastened in the control head 15 in an offset manner Semicircular slides 10, 11 can be pushed into the shaft 1 without delay. It means that no additional time is required to move the shell parts by means of the half-round slide 10, 11 6 to effect before insertion into the shaft 1. The shell parts 6 are as close as possible to the rear Arranged at the end of the shaft 1 and are compressed shortly before the movement of the control head 15, if this is necessary due to the available dimensions

When the control head 15 and the associated semicircular slide 10, 11 move into the bore of the shaft 1, the shell part 6 resting on the semicircular slide 10 first hits the compression spring 5 and presses them together as much as the longitudinal movement of the half-round slide 10 allows, whose stroke is limited by the guide bearing 14 In this end position the first half-round slide 10 is ready the collet head 8 so far passed through the clamping ring 4 that this is now in the area of Collet neck 9 lies During the further forward movement of the control head 15, the spring 18 is compressed and the second half-round slide 11 also moves the other shell part 6 forward through the support collar 2 and the clamping ring 4 until both shell parts 6 are exactly flush axially next to one another are aligned. When the control head 15 goes back, the compression spring 5 expands and pulls the Shell parts 6 into the clamping ring 4, which rest there with the two aligned collet heads 8 and cannot pass through the bore of the clamping ring 4.

The situation of the passage of the second collet head 8 through the clamping ring 4 is shown in FIG F i g. 3 shown. The subsequent collet head 8 presses the already inserted into the clamping ring 4 Collet neck 9 away from the central axis until it almost rests in the bore of the clamping ring 4.

The passage of the collet head 8 through the bore of the clamping ring 4 is by means of lateral Flattened areas 8 ′ are permitted with offset shell parts 6, while with flush shell parts 6 the collet head 8 - consisting of two parts - no longer through the clamping sleeve 4 even without a lead can pass through.

It is possible to compress the diverging parts - collet head 8 and collet neck 9 - to be omitted if a suitable coordination of the dimensions of the bore in the shaft 1 with the Shell parts 6 is made. In this case, the flat slide 19 with their control device omitted.

For this purpose 2 sheets of drawings

Claims (7)

1 2 sen. In order to achieve constant readiness to write, Claims: on the other hand, the aim is for the consumer to dismantle the pen not without further ado, & h. without help t. Device for assembling one of two sets of tools, can be carried out in order to existing parts of the sensitive, functionally important parts by means of a push button 5. Switch actuatable plastic collet into one. Shank of a lead pencil, thereby according to DE-PS 24 47 234 lead pencils are already indicates that two in guide bearings (14) te known that with one of the subject matter of the application Longitudinally movable devices that can be mounted by at least the length corresponding to the length. of a collet head (8) plus the width of an io. Clamping ring (4) displaced on the barer mine and one under the action of one between The half-round slide engaging the collet head (8) is attached to a lead tube and a retaining ring. (10, 11) are provided that a lifting device arranged spring standing collet, on whose Au- is present, with which the half-round slide (10, 11) ßenkonus a clamping ring is pushed, the inside can first be moved at the same time and, once the inner diameter has been reached, is smaller than the maximum outer diameter Chen the end position of the first half-round slide (10) knife of the collet in the conical area is the the second half-round slide (11) in the same end collet head and the collet neck are each position can be moved because it is formed on a half-shell that is attached to a 2. Device for assembly, according to claim 1, there are separating surfaces against each other. The two half-shells characterized in that for guiding the shell 20 are for themselves in one piece made of thermoplastic material lenteile (6) in front of the held shaft (1) made transversely and the outer cone of each half-shell is this movable flat slide (19) provided reduced in diameter by offset surfaces that are up to the diameter of a collet genhalses (9) are displaceable towards one another. a clamping ring made of non-deformable material 3. Device for assembly, according to claims 25 slide, even if the inner diameter of the clamp 1 to 2, characterized in that the second ring is smaller than the maximum outer diameter of the semicircular slide (11) fixed to one of a lifting two adjacent outer cones is
The object of the invention is to provide a Vorden, while between the first semicircular direction for mounting a refill pen to slide (10) and the control head (15) a spring 30 fen whose collet consists of two Half-shells consists, (18) is interposed. the device should be designed so that the on 4. Device for assembly, according to the claims half-shells molded on collet heads 1 to 3, characterized in that the spring can be guided through the clamping ring by virtue of the between the control head (15) and which subsequently the half-shells again in the axial direction first half-round slide (10) interposed 35 direction are to be aligned so that they are completely The spring (18) is larger than the one covered in the shaft (1). turned compression spring (5). This task vrd according to the invention by a 5. Device for assembly, achieved according to the Ansprü- device, in which two in guide bearings Chen 1 to 4, characterized in that, for longitudinal movement, guides are limited by at least the length the longitudinal displacement of the half-round collet head plus the width of a clamping slide (10, 11) on the first semicircular slide (10) ring displaceable offset on the collet head an elongated hole (13) and in the second half-round slide attacking half-round slide are provided that a (11) a stop pin (12) is provided. ne lifting device is available with which the semicircular 6. Device for assembly, according to which the claim slider can first be displaced at the same time and afterwards Chen 1 to 5, characterized in that the half-45 reaching the end position of the first half-round slide (10, 11) in which the second half-round slide in the shaft (1) is in the same end position urgent area has the same cross-section as can be moved further. The advantage of this assembly before the Shell parts (6) have. direction is that the two collet chucks 7. Device for assembly, according to the claims, axially cut out again outside the clamping sleeve 1 to 6, characterized in that the under 50 are directed and therefore when going back in the Boh effect the spring (18) standing half-round slide tion of the clamping ring rest. (10) in its longitudinal movement by the collet chuck heads, which do not stop in the rest position serving guide bearing (14) is limited. can lie against each other more securely in the shaft of the Insert the writing implement, if to guide the 55 lenteile in front of the held shaft transversely to this movable flat slide are provided, which apart from the diameter of a collet neck on one another The invention relates to a device for assembly to be displaceable. one consisting of two shell parts by means of an An embodiment of the invention is in the Push-button actuated collet made of plastic 60 drawing shown and will be explained in more detail below oneir. Shank of his fusee pin. schri? b? n. It is offensive here All known, mechanical lead pencils Fig. 1 is a plan view of the dargestell- with push-button operated collet work according to the ten filler pen and a partial section of the assembly-like functional principles and are therefore also a device very similar in their construction. An important 65 F i g. 2 shows a partial view of the assembly device in FIG ge prerequisite for the production of such fillers- the front end position, nenstifte is their assemblability, the individual parts F i g. 3 is an end view of the collet parts and The clamping sleeve in the position shown in FIG. 1 shown Mon-