DE288325C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 288325 CLASS 46 d. GROUP

FRANKFURTER MASCHINENBAU-AKT.-GES.

vorm. POKORNY & WITTEKIND in FRANKFURT α, M.-BOCKENHEIM.

for compressed air drilling machines.

Patented in the German Empire on November 23, 1913.

The invention relates to a machine with a single-acting piston and crank mechanism, which is to be used in particular for drilling work by means of compressed air and in a known manner on the piston or on the push rod carries a bearing socket open on one side, in which a on the push rod or the bearing head seated on the piston engages. In known machines of this type

ίο a bearing head is attached to the piston, with which a bearing socket arranged on the push rod engages. So with this Version in which the pressure change takes place in the cylinder, the piston with the piston rod is held in a fixed articulated connection in both directions of movement, a support ring is provided, which is with its hemispherical seat against the correspondingly designed piston rod end.

With analogous use of this known device for a machine with a single-acting piston, the piston would not automatically be brought into connection with the piston rod after omitting the support ring mentioned when the machine was started, because the end of the piston rod would then lie freely in the inner cavity of the piston . As a result, could occur a touchdown of sitting on the piston hemisphere on the wall of the step bearing of the piston rod when starting the machine easy because no center forward 35

are seen that the correct interlocking of piston and piston rod among all Circumstances guarantee.

This disadvantage is avoided according to the present invention in that the Bearing head with the bearing socket when starting the machine by means of one on the piston or automatically brought into engagement with the guide arranged on the push rod and when Operate the machine while avoiding an inevitable connection only by the working pressure acting on the piston is kept engaged, so that when removing the crankshaft the entire push rod without loosening fasteners from the Plunger can be removed.

Since according to the invention, the switching of a easily exposed to the risk of loosening Link between the piston and the push rod is avoided, offers the machine also has the advantage of increased operational safety. It is also a convenient one Cleaning of the bearing socket and the bearing head is made possible because these parts are easy are accessible.

The self-acting guide that enables the piston rod to be inserted in the correct position Position to the piston is facilitated, for example, from ribs attached to the interior of the piston of various lengths or of lobes that sit on the piston rod.

In Fig. Ι and 2 of the drawing are two

various embodiments of part of the subject matter of the invention Machine illustrated schematically.

In the cylinder a open at one end (Fig. I) of a compressed air drill ο. Like. Moves a single-acting piston b, which is driven by the propellant introduced into the cylinder in the usual way. In the middle of the funnel-shaped piston head c there is provided an expediently hemispherical bearing socket d which is open on one side and in which a spherical bearing head f seated at the inner end of the push rod e usually rests. The push rod e consists of a solid piece and is articulated at the outer end to the crank pin g of the working shaft h. For this purpose, in the embodiment shown, the fork prongs ft provided on the outer push rod end are bent around the pin g.

The said bearing cup r between the annular shoulder lying d i unilateral opening of the pan has such length that the push rod f e readily with the pan bearing head of d can be brought into or out of engagement. An inevitable connection between the socket d and the head f is avoided. When the machine is working, the head f is held in engagement with the pan d only by the pressure of the propellant acting against the piston b.

In order to facilitate the introduction of the bearing head f into the bearing socket d , the interior of the piston b is expediently provided with a guide arranged in the manner of a funnel, which in the embodiment shown consists of annular ribs k of different lengths. When the inner push rod end is inserted into the piston, the bearing head f slides on the edges of the ribs k and is in this way safely brought into engagement with the bearing socket d.

Instead of the ribs k , a smooth, funnel-shaped guide can also be provided in the interior of the piston.

When removing the crankshaft h, g , the entire push rod e can easily be removed together with this shaft, since the bearing head f can be removed from the bearing socket d without loosening fasteners.

In the embodiment according to FIG. 2, a reverse arrangement of the bearing socket and the bearing head as in the machine according to FIG. 1 is selected. The bearing socket m ' (FIG. 2) is provided in the form of a funnel which merges into a hemisphere at the bottom at the inner end of the push rod e . The in! the bearing socket m gripping, at the free end hemispherical design bearing head η sits on the funnel-shaped bottom c of the piston b. In order to be able to easily bring the bearing socket m into engagement with the bearing head η , two rounded guide tabs 0 are provided at the inner end of the push rod e , which are arranged parallel to a plane lying at right angles to the axis of the crankshaft h. When the inner end of the push rod is inserted into the piston b , the tabs 0 slide on the inner surface of the piston skirt, so that the bearing socket m securely engages with the bearing head η . ■

Claims (3)

Patent Claims: 1. Machine with single-acting piston and crank mechanism, in particular for pneumatic drilling machines, one on one side on the piston or on the push rod open bearing socket is provided, in which one on the push rod or on the piston arranged bearing head engages, characterized in that the bearing head with the bearing socket when the machine is started by means of one arranged on the piston or on the push rod Leadership automatically engaged and when operating the machine while avoiding an inevitable Connection engaged only by the working pressure acting on the piston is held so that when removing the crankshaft, the entire push rod without loosening fasteners from can be removed from the piston. 2. Machine according to claim 1, characterized in that in the interior of the piston (&) arranged in the manner of a funnel guide (k) is provided to the introduction of the at the inner end of the push rod (β) seated bearing head (f) in to lighten the bearing cup (d) of the piston. .105 3. Machine according to claim 1, characterized in that at the inner end of the push rod (e) guide tabs (0) are arranged which slide on the inner surface of the piston skirt to the provided at the inner end of the push rod bearing socket (m) easily with the to be able to bring the bearing head (s ) provided on the piston (δ) into engagement. 1 sheet of drawings.