DE1136289B - Double piston jackhammer - Google Patents

Description

The invention relates to a double piston air hammer with two coaxially arranged one behind the other Percussion pistons, of which the piston closest to the insertion tool is designed as a hollow piston, and with a slide control that is operated on The end of the handle is arranged in the axis of the cylinder housing and alternately the top of the fresh air is applied to one and at the same time the underside of the other percussion piston.

There are double piston hammers with two coaxially arranged pistons known, one after the other Perform the impact stroke and its return stroke. Such hammers can also be operated in such a way that the piston top and bottom side by means of a slide at the same time alternately with pressure medium be applied.

The invention has set itself the task of such hammers in terms of the speed of reversal, the reduction of the air requirement as well as the achievement of an even cycle sequence of both Piston, in particular the lower percussion piston that is furthest away from the control system to improve.

According to the invention, this is achieved in that the reversal of the slide as a function from the impact and return stroke of the lower hollow piston through fresh air, which after flowing into the lower cylinder spaces from these alternately to the bottom and top of the slide via the channels is directed, and the slide in each end position by applying fresh air to two ring surfaces is held until it is reversed.

In the case of a control arrangement located in the upper part of the hammer, which is more favorable than a centrally arranged one for structural and manufacturing reasons Control, although it has the advantage of air ducts of equal length, it is of great advantage according to the proposal the invention, the slide movement independently of the lower, distant percussion piston control in order to be able to maintain its full impact despite long airways. To reverse the The slider is preferably the impact or return stroke air introduced above or below the lower impact piston used, which increases the speed of reversal by the application two ring surfaces held in the respective end position slide.

In the drawing, a preferred embodiment of the invention is in a longitudinal section through the Hammer shown.

The cylinder housing 1 of the hammer shown has two cylinder chambers 2, 3, in each of which a percussion double piston air hammer

Applicant:

Machine factory

R. Hausherr & Sons G.m.b.H.,

Sprockhövel (Westphalia), Elberfelder Str. 53

August Altenhain, Sprockhövel (Westphalia),

August Citizen,
Hiddinghausen-Uhlenbart via Gevelsberg,

and Dipl.-Ing. Herbert Landlord,

Sprockhövel (Westphalia),
have been named as inventors

piston 4 and 5 is arranged. The piston 4 has a rod-like projection 6 which slidable between the cylinder chambers 2, 3, but sealingly passes through the partition 7, and also a central bore 8 of the lower piston are 5. By different diameters of the cylinder chambers 2, 3 and the percussion piston 4, 5 equally large piston surfaces acted upon by the pressure medium during the working stroke are formed; Both pistons also have the same dimensions, so that their impact torques are practically the same.

The cylinder housing 1 is above by the z. B. screwed cylinder head 9 closed on which a handle (not shown) or other holding device can be attached. The lower cylinder space is closed by a housing part 10 that forms the guide for the tool 11 on the the percussion pistons act through the intermediary of an anvil 12.

The ZyPnr'crkopf 9 is used in the illustrated embodiment as a control housing and has a stepped tapering central bore 13 which designed as a hollow piston valve control member 14 receives. The hole 13 is up through a Plug 15 closed on which the connection nipple 16 for the pressure medium supply (not shown) is provided.

The supplied compressed air or the like flows from the connection nipple 16 through the channel 17 to an annular groove 18, in the serving as a guide surface for the control slide 14 inside wall of the control housing

209 '639/60

is recessed. In the position of the control slide shown in the drawing, the pressure medium flows from the annular groove 18 through the one circumferential groovel9 of the Slide via the adjacent annular groove 18 'provided in the control housing into the (one behind the other) Channels 20, 21, the pressure medium at 22 the cylinder space 2 'below the upper piston 2 and at 23 the Feed the cylinder space 3 'above the lower piston 5. As a result, the upper piston 4 is moved upwards (Return stroke) and the lower piston 5 downwards (impact stroke). The drawing shows both pistons in their end positions these lifting movements again.

During the downward gear, the lower piston 5 has released the wall opening 24 so that pressure medium is discharged the filling of the cylinder space 3 'through the wall channel 25 into the lower cavity 26 of the through the Partition 27 can flow in approximately in the middle of the subdivided control slide 14. The control spool will thereby raised and brought into its other control position, in which the annular projection 28 against the Front face 29 of the screw connection 15 rests. The pressure medium now does the following:

From the annular groove 18, which is permanently connected to the connection nipple 16 is in connection, compressed air flows through the other circumferential groove 19 'of the control slide via the annular groove 18 ″ into the annular channel 30 and from there into the wall channels 31, 32, of which the channel 30 leads to the cylinder chamber 2 above the upper piston 4 and channel 31 leads to the cylinder chamber 3 below of the lower piston. The lower piston 5 now makes a return stroke and the upper piston 4 does one Stroke stroke.

During the upward gear, the lower piston 5 flies over a wall opening 32 through which the pressure medium exits Filling of the cylinder space 3 below the lower piston 5 can flow into the wall channel 33, which opens into the upper cavity 35 of the control slide 14 so that the control slide returns to the position shown Starting position is moved back, so that the work cycle described can begin again. From the annular channel 18, a small branch channel 38 leads to two openings 39, 40, which are in the area of the annular projection 28 of the control slide are arranged such that the control slide through Compressed air is resiliently held in its respective end position until a changeover pulse occurs.

Claims (1)

PATENT CLAIM: Double piston air hammer with two coaxially arranged percussion pistons, of which the one closest to the insert tool © piston is designed as a hollow piston, and with a slide control which is arranged at the end of the handle in the axis of the cylinder housing and which alternates with the top of one and at the same time the bottom of the other percussion piston Fresh air is applied, characterized in that the reversal of the slide (14) takes place depending on the stroke and return stroke of the lower hollow piston (5) by fresh air, which after flowing into the lower cylinder chambers (3 or 3 ') from these via the Channels (24, 25 or 32, 33, 34) alternately on the bottom (26) and top (35) of the slide, and the slide in each end position by applying fresh air to two annular surfaces (39, 40) up to its Change of course is held. Considered publications:
French Patent No. 545 592;
Austrian Patent No. 78 189;
U.S. Patent Nos. 1,852,593, 2072607. 1 sheet of drawings © 209 639/60 8.62