DE1215313B - Compressed air impact device for general use in foundries - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN MjtWl · PATENT OFFICE

EDITORIAL

Int. CL:

B22d

German KL: 31c-30 / 03psi. Bl>! ■ *? ■

Number: 1215 313

File number: Sch 34760 VI a / 31 c

Filing date: March 6, 1964

Opening day: April 28, 1966

The invention relates to a pneumatic impact device for general use in foundries, for example to cut off risers or sprues.

So far it has been customary that the risers and sprues with 6 to 10 kg heavy hammers can be knocked off by hand. The generally prevailing shortage of staff today and last but not least, the strenuous physical exertion of the conventional one Method gave rise to a pneumatic one for the purpose described above Develop impact device. The invention proposes such an impact device on a jib crane or to hang it up on a trolley using a spring balancer. This ensures great freedom of movement. In addition, the weight of the impact device is fully taken over by the suspension. Furthermore, a suspension in the center of gravity allows the impact device to move physical exertion avoided. The operator is able to effortlessly switch the device to the desired position Bringing working position. The automatic spring balancer ensures the required height. To completion the handling of the device is proposed to the two handles in the longitudinal direction to be staggered.

The impact device according to the invention is constructed as follows. Within the cylindrical outer housing of the impact device according to FIG. 1, which is provided with a few gradations, a pressure chamber α is accommodated in the upper half. By operating a valve of the d-fitting at the lower end of the piston rod valve disc is e b c via an auxiliary piston which is fixed to the upper end of a piston rod d, raised. As a result, the compressed air located in space α , for example, compressed to 6 atmospheres, is suddenly released to act on the piston. The piston / is also designed as a firing pin; this firing pin is guided with a clearance of about 0.5 mm in the cylindrical casing g. Shortly before the front end of the tube g , lateral openings h are provided. The air in the pipe can escape through these openings h without resistance when the firing pin / is brought into the working position. After the striking pin / the object to be knocked off the casting, valve b is returned to its original position. The spring i pushes the piston c back into its starting position. So that the valve disk e is brought into the closed position at the same time, so that the

Compressed air impact device for general use in foundries

Applicant:

Karl Schmidt

Company with limited liability,

Neckarsulm, Christian-Sehmidt-Str. 10

Named as inventor:

Adolf Diez, Heilbronn / Neckar;

Josef Heim, Oedheim

Pressure chamber α can be filled with compressed air again. The firing pin / is used every time you work

ao gang brought back by the mainspring k . The air in the shot cylinder g can escape to the outside via the hollow piston rod d and via outlet openings /. After this, the striking process can begin again.

as in fig. 2 the suspension of the impact device according to the invention is illustrated in the drawing. The impact device is fastened in its center of gravity in a jib crane η via a spring balancer m. This means that it can easily be brought into any working position.

In the F i g. 3 and 4 are somewhat improved embodiments of the head of the impact device according to FIG. 1 shown.
According to FIG. 3, an intermediate bolt ο is installed at the front opening of the shell g. This intermediate bolt ο is mounted between a spring ring ρ and the front collar of the jacket g. In this way, it is avoided that dirt or broken castings penetrate into the front opening of the jacket g , since the outer diameter of the bolt ο almost corresponds to the diameter of the front collar of the jacket g . Such a solution is particularly recommended if the accumulation of dirt and splinters is particularly large. If necessary, the embodiment according to FIG. 3 can be subsequently installed on an impact device according to FIG. 1. The embodiment according to FIG. 3 also has the advantage that when the striking pin / on the intermediate pin o, after which it moves forward, the air enclosed in space q is earned and in this way in the final movement of the intermediate

609 560/397

bolt ο causes damping. A number of small holes r for ventilation are also provided on the circumference of the jacket g , so that neither dirt nor broken castings can get into the interior of the jacket g here either. The bores r can optionally also be covered with a sieve-like fabric.

The embodiment according to FIG. 4 corresponds essentially to the original embodiment according to FIG. 1. Only on the frontal collar of the jacket g is a conical design s provided, which is also intended to prevent the penetration of dirt and broken castings.

Claims (5)

Patent claims: 1. Pneumatic impact device for general use in foundries, for example for separating risers or sprues, characterized in that the impact device, which is provided with a substantially cylindrical outer housing, has a pressure chamber (α) in its interior in the upper half, from which when the poppet valve is lifted (e) via an auxiliary piston (c) with piston rod (d) and valve (6), the compressed air from space (α) fully pressurizes the main working piston (/), which also serves as a firing pin and which is returned by spring (k) its original position is withdrawn after the piston (c) has returned to its original position by the spring (i). That is provided on the front opening of the shell (g) an intermediate pin (o) 2. Preßluftschlaggerät according to claim 1, characterized in that the outer diameter nearly equal to the inner diameter of the front collar of the jacket (g) and a flange at its rear side Has collar which is used for guidance within the shell (g) and which is mounted between the spring ring (p) and the front collar of the shell (g). 3. Compressed air impact device according to claim 1, characterized in that the inner annular surface of the front collar on the jacket (g) has a conical design (s) . 4. Compressed air impact device according to claims 1 to 3, characterized in that on the circumference of the jacket (g) ventilation holes (r) are provided. 5. Use of a compressed air impact device according to claims 1 to 4, characterized in that that the impact device in its center of gravity via a spring balancer on a jib crane or is suspended freely movable on a trolley. 1 sheet of drawings 609 560/397 4.66 © Bundesdnickerei Berlin