FI57547C - ANORDNING FOER DAEMPNING AV REKYLEN VID EN SLAOENDE MASKIN - Google Patents

Description

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Patent- och reglsterstyrdMn '' Ameku uti «« d oeh uti.ikrtfun pubiicand 30.05.80 (32) (33) (31) Pn «l« tty «uelkuut -B * ilrd ptierltvt 23.05-73

Sweden-Sweden (SE) 730722L-1 (71) Atlas Copco Aktiebolag, Nacka, Sweden-Sweden (SE) (72) Äke Torsten Eklöf, Skärholmen, Gunnar Vigg Riss Romell, Djursholm,

Ruot s i -S veri ge (SE) (7M Berggren Oy Ab (54) Device for damping recoil in impact machine - Anordning för dämpning av rekylen vid en sl & ende maskin

The present invention relates to percussive machines and relates to a device for damping recoil from a tool connected to a machine.

A known device of this type comprises a spring by means of which the supply force is transferred from the housing of the machine, i.e. from the housing to the tool. The disadvantage of this device is that the length of the spring depends on the feed force applied to it. As a result, the position at which the tool neck is located when the impact piston hits it depends on the applied feed force. Thus, a machine comprising such a recoil damper operates optimally only with a certain predetermined feed force.

The object of the present invention is to eliminate the above-mentioned drawback and the features of the invention will become apparent from the appended claim 1.

2 57547

An embodiment of the invention will now be described in more detail with reference to the accompanying drawing, which shows an impact drill in partial section.

The percussion drilling machine shown comprises a machine housing 1 in which a reciprocating impact piston 3 is fitted. · The drill sleeve 6 is mounted on the machine housing 1 by means of rotating bearings 8, 9. The motor 2 rotates the gear wheel 5, the drill sleeve 6 and another tool 7 through the sleeve 7. 1 rotation bearing 10 rests on a support surface 14 arranged at a predetermined distance from the surface 13 to the machine housing 1. The transfer device 15 rests on the surface 16 on the tool 4 and is compressed forward by a bias spring 12 which rests on the bearing 10 via a sleeve 11.

The machine shown works as follows.

When no supply force acts, the force is transmitted from the prestressed spring 12 through the transfer device 15, the drill sleeve 6 and the bearing 8 to the support surface 13 of the machine housing 1. · When the supply force is applied to the machine housing 1, the tool 4 is pressed against the transfer device 15 surface 16. This does not mean that the tension of the spring changes, but only that the load moves away from the support surface 13 · When drilling, the tool 4 rotates rotated by the motor 2 while the impact piston 3 applies impacts to it. When the tool 4 kicks back from the base to be drilled, it strikes the surface 16 of the transfer device 15, whereby the transfer device rises out of contact with the drill sleeve 6 if the recoil force exceeds a certain value. In this case, the effect of the recoil on the machine housing 1 is damped. The tool 4 then returns to a position independent of the feed force under the action of the spring 12.

The embodiment of the invention described above and shown in the drawing is to be considered as an example only, which can be modified within the scope of the following claims.

Claims (2)

3,57547 1. The order in which the machine is used, for the purpose of returning the account to the masking device (4), to the user and to the masking device (1) and to the maturing device to the account (4) the anchor device (13, 14) and a net device (12) are provided with an access device (4) and an anchor device (12) with an access device (12). Apparatus for damping recoil from a tool (4) connected to the machine in percussion machines, comprising a machine housing (1) and a spring (12) transmitting a power supply to the tool (4) between two support surfaces (13, 14), characterized in that the spring ( 12) is biased and the tool (4) is adapted to act on the spring (12) between said support surfaces so that the length of the spring is substantially independent of the supply force. Device according to claim 1, having a device (6, 7) for rotating the tool, characterized in that the spring (12) is pressed between two rotating bearings (8, 10) resting on said support surfaces (13, 14). Device according to claim 2, characterized in that the device (6, 7) for rotating the tool (4) is arranged between a spring (12) and said second rotating bearing (8) and is supported in the machine housing (1) by this rotating bearing (8) and yet another swivel bearing (9) · Device according to Claim 2 or 3, characterized in that the transfer device (15) which transmits the supply force rests on the spring (12) on the one hand and on the tool (4) on the other. 2. An arrangement according to claim 1 in which an arrangement (6, 7) is provided for rotation of the network (4), the rotating means, the fitting (12) being used as an injector (13, 14). ).