DE2064999A1 - Thrust piston training and thrust piston interception device on an internal combustion bolt setter. Elimination from: 2020959 - Google Patents

Description

Patent attorney 9 Π R Λ Q Q

Dipl.-Phys. Rudolf Peerbooms

56 Wuppertal-Barmen
Friedrich-Engels-Allee 349/351 Call 5561 47

P 1887/71 / Pee / B

Patent registration (elimination from patent application P 20 20 959 »0)

Applicant: ETEM, Etablissement

de Technique Modernes Vaduz / Liechtenstein

SchubkoTbenausbildung and Schubkolbenabfangein'- device on an internal combustion pin setter

The invention relates to thrust piston training and thrust piston interception device on an internal combustion pin setter, the thrust piston is designed as a one-piece rod, which has a guide thickening at a ^ point and which is assigned a corresponding barrel diameter, the ^L on the front part with a thrust piston catch in the form of stop surfaces for the Guide thickening is provided. With such internal combustion bolt setting devices, the fastening means to be driven, such as dowels, bolts, nails etc. are driven into a hard material such as concrete, wood, metal, etc. by a propellant gas impact acting on the thrust piston. The thrust piston designed as a piston with a piston rod remains in the bolt setting tool .

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In the case of devices of the aforementioned type, the Absorption of the excess energy that may be present at the end of a driving process and retention of fragments inside the device in the event of any Problematic piston breakage

The more or less damped catching of the thrust piston at the end of an operation is already prevented by dampers.

^w schiedenster way been realized · The 'Experience has shown that the damper quickly lose impact, particularly when a considerable excess kinetic energy is present at the end of the driving operation of the fastening device. Because holding back thrust piston fragments is essential for safety reasons «. In general, the thrust piston is rod-shaped and provided at a location with a thickening, which impinges on a fixed part of the device, that is when the thrust piston is shot towards the front. The front part of the thrust piston acts on the fastening means to be driven in, while the rear part of the thrust piston is guided in a barrel in which propellant gases act on the thrust piston due to the ignition of the charge.

The object of the present invention is to provide an effective To create a thrust piston with a collecting device, which gradually and reliably opens in the end area of its drive-in path.

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is catchable, with a high level of security should be ensured that possibly thrust piston fragments in the Inside the device.

This object is achieved according to the invention in that the cross section of the front of the thickened guide, d. H. to the Pistol muzzle, lying shaft of the thrust piston decreases towards the front and that the mass of the thrust piston depending Unit of length is small at the front and progressively increasing towards the rear

In the context of the invention, it is particularly advantageous if the shaft of the thrust piston is located on its inner part has a predetermined breaking point, which is preceded by a collar, which in the event of a break on the shoulder of the Thickening of the lying guide hole and prevents the broken piece from escaping from the device

In the context of the invention, it is also advantageous if the cross-sectional decrease of the shaft by flattening causes.

Since the thrust piston by hitting its thickened part is braked, a tensile stress is exerted on the piece lying in front of the thickened part. This takes - from the front to the front going to the rear - for every cross-section, because it is pro-

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proportional to that lying in front of the cross-section under consideration Push piston mass · As the cross section increases, the increasing tensile stresses become the same for each cross section Wise absorbed and the danger point of a possible break is moved to the rear. This occurs theoretically no rupture occurs if each section is sufficient to absorb the tensile stress applied to it. To actually each To exclude risk, the invention ensures that a possible break is localized very precisely at a predetermined breaking point. If a break occurs at this point, the broken piece of the thrust piston is knocked off of the collar, which is arranged in front of the predetermined breaking point, on the shoulder of the cylindrical guide located in the front part prevented from leaving the barrel. The increase in the cross-section towards the rear is advantageously achieved by means of cavities and flats, the slope of which increases towards the front. Retains the entire front part of the thrust piston at the same time its cylindrical enveloping surface, with which its guidance in the bore is secured in a known manner »

The subject of the invention is based on a Described embodiment shown in the drawing.

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The barrel 101 comprises a rear cylindrical guide bore 6 and a central cylindrical guide bore 9 with a larger Diameter that narrows in a known manner to an inner cone 10a The inner cone 10a is followed by a cylindrical bore 200 with a smaller diameter, with one Shoulder 10b is attached between the inner cone 10a and the cylindrical bore 200.

The thrust piston M comprises a rear thrust piston part 15, which interacted with the cylindrical guide bore 6 during the beginning of the trajectory of the thrust piston M The thrust piston M furthermore has a central guide thickening which cooperates with the bore 9 and which acts as a a tapering outer cone 16 'is formed at the front Outer cone 16 'in turn interacts with inner cone 10a in order to brake thrust piston M. The thrust piston M runs out at the front into a front shaft 17, the cross-section of which gradually decreases towards the front - for example by flattened areas 17d. The shaft 17 runs forward into a cylindrical head piece 1? e running in a guide 13.

In the thrust piston M, in front of the thickening 16, a predetermined breaking point 17g designed as a hat is provided. The groove 17g a collar 201 follows, which forms a safety stake but could be displaced if the thrust piston M in front

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would be frustoconical and not cylindrical as mentioned Envelope "would have.

The cross section of the shaft 17 in front of the shoe piston M takes to the rear in order to shift the danger point for a break to the rear, which is caused by the braking of the thrust piston M when the outer cone 16 'and the inner cone 10a meet can occur. If a break occurs, it will take place in the zone of small cross-section in Fut 17g. Of the consisting of the shaft 17 and the collar 201 broken Part is made by striking the collar 201 on the shoulder 10b prevented from leaving the device »

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Claims (2)

Claims Push piston training and push piston detachment on an internal combustion pin setter, the thrust piston is designed as a one-piece rod which is attached to a Place has a thickened guide and to which a corresponding barrel diameter is assigned, with the barrel on the front part with a piston catch in Provided the shape of stop surfaces for the guide thickening is, characterized in that the cross section of the front of the guide thickening (16), d · h. to the gun muzzle down, lying shaft (17) of the thrust piston (M) decreases towards the front and that the mass of the thrust piston per unit of length is small at the front and progressively increasing towards the rear. 2. Push piston design according to claim 1, characterized in that the shaft (17) of the push piston (M) on its inner part has a predetermined breaking point (17g) which is preceded by a collar (201) which in the event of a break on the shoulder (10b) of the guide hole (200) in front of the thickening (16) hits and the exit of the broken piece from prevents the device. 109848/0190 Thrust piston according to Claim 1 or 2, characterized in that that the cross-sectional dimensions of the shaft (17) is achieved by flattened areas (I7b). 109848/0190