DE400758C - Eccentric gear for riveting hammer - Google Patents

Description

GERMAN EMPIRE

ISSUED ON AUGUST 19, 1924

REICH PATENT OFFICE

PATENT LETTERING

- JVi 400758 CLASS 49 e GROUP 4

(B 105727 Ij4g e)

Joseph Charles Barrett in New York.

Eccentric gear for riveting hammers. Patented in the German Empire on July 19, 1922.

The invention relates to an eccentric gear for riveting hammers and the like, in which an eccentric pin into a curved slot

to cause movement. According to the invention, the novelty is that the one Side wall of the curved slot with

an eccentric rod head engages to j relation to the eccentric rod head movable the same is arranged in a reciprocating Bej in order to reduce the friction of the eccentric

Claims (2)

to reduce tric pin as possible. The subject matter of the invention is attached to Drawings shown. Fig. Ι shows the vertical cross section of a riveting hammer. Fig. 2 shows a section taken along line 2 to 2 of Fig. Ι. Fig. 2a to 2d show the eccentric gear of the hammer in different working positions. Fig. 3 is a perspective view of a rod head. The transmission is installed in a housing 3 and is expediently driven by means of an electric motor, which would have to be mounted above the housing 3 in a bracket B or the like. The motor transmits its movement by means of a shaft 1 ″ to a worm gear 23, which in turn sets a crank 14 in rotation, at one end of which there is an eccentric pin 13. This pin 13 engages in a curved slot 7 * of the eccentric rod head 7, the is consequently moved back and forth in the vertical direction and, according to the exemplary embodiment given in the drawing, is incorporated into a tool A by means of a punch S. In order to reduce the friction between the eccentric rod head and the eccentric pin as much as possible, a wall of the curved slot is made movable by opening A ring or a roller 16 is placed on the pin 17 of the eccentric rod head involved in the formation of the curved slot.; Now this roller 16, in conjunction with the opposite curved wall y incorporated in the eccentric rod head, forms the curved guide slot 7 '' becomes that the wall J ^c for the most part i k is concentric to the roller 16. The J pin 13 comes reciprocally with the; Roller 16 and the wall of y ^c during the working, beitsvorganges engaged, namely he is about to _^2/3 of its rotation for the purpose of driving of the punch 8, that is for lifting; the same in engagement with the roller 16, while the remainder of the revolution of the eccentric pin 13 remains for engagement with the surface 7 ' for actuating the punch ^: during the working stroke. Since the roller 16 is rotatably seated on the pin 17, the frictional resistance between the parts 16 and 13 is considerably reduced. The individual working positions of the eccentric! transmission can be seen in Figs. 2a to 2d. In Fig. 2 and 2a the gearbox is! shown with the punch 8 at the end of its working stroke. The crank disk 14 on which the pin 13 is seated should rotate counterclockwise, ie in the direction of the arrow shown. During the further rotation of the disk 14 (see Fig. 2aj, the pin 13 comes into engagement with the roller 16 and lifts the punch S. The engagement of the pin 13 with the roller 16 remains until the pin reaches the position shown in Fig. 2b The further rotation will now bring the pin 13 into contact with the surface -] ^c (cf. Fig. 2cj, whereupon it finally returns to the position indicated in Fig The movement will take place very quickly.If the pin assumes the position indicated in Fig. 2d, it being assumed that the punch is in contact with the tool A , the pin will practically no longer be on any of the side walls of the curved slot act and release the hammer so that it can continue its downward movement and, as a result of its mass acceleration, performs a rough blow on tool A. Now the St can be achieved. The further steps are repeated in exactly the same way. Since the action of the pin in the slot is limited to the section located below the center of the roller 16, the curved slot above this point, as was also indicated in the drawings, can be widened, ie it can be open in the upper part of the eccentric rod head. Patent claims: i. Eccentric gear for riveting hammers and the like, with the designed as a role Eccentric pin engages in a curved slot in the eccentric rod head, characterized in that a side wall (16) of the slot in relation is arranged movably on the eccentric rod head (7), whereby the friction between this wall and the eccentric pin (13) is reduced. 2. Transmission according to claim 1, characterized in that the movable side wall of the curved slot is designed as a roller (16) on a on the rod head (7 j rests firmly seated pin. 1 sheet of drawings.