US1271029A

US1271029A - Practice-bomb.

Info

Publication number: US1271029A
Application number: US22637118A
Authority: US
Inventors: Emil Gathmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-04-03
Filing date: 1918-04-03
Publication date: 1918-07-02
Anticipated expiration: 1935-07-02

Description

E. GATHMANN.

PRACTICE BOMB.

APPLICATION FILED APR. 3. 1.91s.

1 ,27 1 ,029. Patented July 2, 1918.

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UNI

EMIL GATHMAIN'N, OF BALTIMORE, MARYLAND.

PRACTICE-BOMB.

Specification of Letters Patent.

Patented July 2, 1918.

Application filed Apri13, 1918. Serial No. 226,371.

" Baltimore city, Maryland, have invented certain new and useful Improvements in Practice-Bombs, of which the following is a specification.

The object of this invention is to provide an inexpensive substitute for the regular or war bomb to be used by aviators or others while training or practising for actual service.

Such dummy or practice bombs should, as nearly as possible, be of the same welght, shape and dimensions as the regular bomb and should have their center of gravity in the same plane as such a bomb.

In carrying out my invention I therefore use such material and so shape the parts as to enable me to provide a dummy bomb possessing all of these characteristics and such materials are also used that the bombs may be cheaply manufactured and may possess the requisite strength and stability for their intended use.

I preferably use a plastic material, such as concrete, to construct the body of the bomb which can be easily molded and will give such weight to the bomb as to approximate the weight of the regular or war bomb. The vanes are preferably made of sheet steel and are carefully centered and firmly connected to a core, preferably made of material.

wood, which is embedded in the front and rear portions of the bomb serving to hold them together. The nose of the bomb may be made of metal and the vanes are preferably reinforced and braced by a metallic band. The bomb is provided with a vacant space or air chamber properly located between its opposite ends in order to locate the center of gravity in the front portion of thevbomb. In order that the vanes may be, properl centered and firmly held when once adjuste they are formed with holes or per forat'ions through which extends the plastic material thereby serving to key the vanesto the body of the bomb, and I may also employ a wire which is threaded through the holes in the vanes and inclosed in the plastic A similar wire may be employed in the front portion of the bomb to reinforce it in the manner hereinafter described.

Qther features of the invention will be hereinafter explained.

In the accompanying drawings Figure l is a View partly in side elevation 7' '7 and partly in section of a practice bomb embodying my improvements.

1g. 2 is a perspective view, showing partlcularly how the vanes are held in place.

Fig. 3 shows a transverse section on the line 33 of Fig. 1, illustrating particularly the manner of securing the vanes to the body of the bomb and to the core.

The body of the bomb is composed largely of plastic material, concrete being preferred, and preferably what is known as two to one concrete is employed. The body portion of the bomb comprises a front portion A and a rear ortion B and as a whole the bomb is of clgar shape, having a middle cylindrical portion m, a tapered front part a and a tapered rear part Z). There is a space or chamber C between the front and rear parts which is closed by a cylinder D, made by preference, of sheet metal and preferably extending from the front tapered portion of the bomb to the rear tapered portion thereof.

The front and rear portions of the bomb are connected by a core E, preferably made of wood, and extending at opposite ends into said front and rear parts of the body. These ends are anchored to the parts of the body and serve to hold them together in proper spaced relation. The front portion of the core, it will be observed, is formed with an annular groove 6 which prevents the core from slipping, and preferably a wire F is attached to the core and anchored in the part A of the bomb serving to reinforce this portion of the bomb and to also assist in holding the core in place. A nose G, of suitable material, is applied to the front of the bomb and may be attached thereto in any suitable way. Preferably the nose carries prongs g which serve this purpose.

The vanes H are preferably made of sheet steel and are of the same size and shape as are the vanes of the regular bomb. Preferably three pieces of sheet metal are employed, one piece, It, being made to form two of the four vanes, while two other pieces, 72/, k constitute the other vanes. The vane h is passed through a slot in the rear portion of the core and projects to an equal extent from each side thereof, while the vanes h, enter slots in the core and abut against the vane 72., in the manner indicated in Fig. 3. The vanes may be secured to the that they should be very firmly connected with the body portion'of the bomb. For the latter purpose the vanes are formed with holes 72. through which a wire L is threaded, in the manner clearly shown in Fig. 2. Inasmuch as the rear portion of the core is tapered the holes are preferably arranged in series conforming to such taper. The wire is embedded in the concrete and the concrete extends through the holes k thus securely connecting the vanes with the bomb proper. The concrete fills these holes and also fills the spaces between the vanes to the extent indicated in Figs. 1 and 3. This way of connecting the vanes to the body of the bomb is of considerable importance.- I would say, however, that it is not necessary to use the spiral wire L. This is employed for additional securit and also to reinforce the concrete. The re ative size of the front and rear portions of the bomb, the size of the air space or chamber C and the weights of the vanes and other elements used are such, and the parts are so located, as to cause the center of gravity of the bomb as a whole to be located in the front portion of the bomb in the same manner that it is located in the regulation or war bomb.

In making the bomb the following procedure is preferred: The vanes are first connected with the core in the manner before described, the wire being threaded through the holes in the vanes and the vanes with the core attached are placed in a suitable mold into which the concrete is poured. Preferably a cylindrical casing D is employed and when this is the casethe concrete is poured into this cylinder until the rear portion of the bomb is formed. Then a disk or partition M is inserted in the cylinder and held in place by nails m at a suitable distance from the rear portion of the bomb to provide a space C of suitable size.

The wire F. is then applied to the core and the concrete is poured into. the cylinder D until the latter is filled, after which the front portion of the bomb is formed in a suitable mold. After this the nose G is applied and the'bomb is then complete.

By thus constructing. a practice bomb of plastic material, such as concrete, with a core for connecting the front and rear portions of the bomb and for centering the vanes, practicebombs may be produced'at very small expense and with great accuracy, the

weight shape and dimensions and general appearance of the bomb being practically the same as the regular bomb, and also the important feature of having the center of gravity in the forward part of the bomb, precisely where it is in the regulation bomb, is also obtained.

I claim as my inven'tion:-

1. A practice bomb, comprising a body portion, a core within the body, and vanes at one end of the bomb attached to the core.

2. A practice bomb, comprising a body portion of plastic material, a core within the body, and vanes at one end of the bomb attached to the core.

3. A practice bomb, comprising a body portion of plastic material, a wooden core within the body, and vanes at one end of the bomb attached to said core.

4. A practice bomb, comprising a body portion, a core within the body portion, vanes at one end of the bomb secured to the core, and a wire surrounding the core connected with the vanes and anchored in the body of the bomb.

5. A practice bomb, comprising a body portion made of plastic material, a core within the body portion, vanes at one end of the bomb secured to the core, and a wire surrounding the core connected with the vanes'and anchored in the body of the bomb.

6. A practice bomb, comprising a body portion of plastic material, vanes having perforations in them through which the plastic material extends and forms keys which firmly connect the vanes with the body 7. A practice bomb, comprising a body portion of plastic material, vanes having a series of perforations in them through which the plastic material extends forming keys which connect the vanes with the body, and a core to which the vanes are also connected.

8. A practice bomb, comprising a body portion consisting of front and rear parts with a space between them for placing the center of gravity in the front portion of the bomb, and vanes centered and connected with the tail of the bomb.

9. A practice bomb, comprising abody portion consisting of front and rear parts -with a space between them, a core connecting the front and rear portions of the bomb,

and vanes mounted at the tail of the bomb and attached to the core.

10. A practice bomb, comprising a body portion of molded plastic material having a front. part and a rear part with an air space between them, a core connecting thespace and connecting the front and rear parts of the bomb, reinforcing Wires arranged longitudinally in' the front and rear portions of the bomb, and vanes securely fastened to the tail of the bomb.

12.-A practice bomb having front and rear portions made of plastic material with a space between them, a cylinder inclosing said space, vanes formed with perforations,

10 a core connecting the front and rear portions of the bomb, and a wire embedded in the rear portion of the body and extending through the perforations in the vanes.

In testimony whereof, I have hereunto subscribed my name.

EMIL GATHMANN.

Witnesses MICHAEL LUBER, ISABEL GATHMANN.