DE1283769B - Percussion hammer - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL.

B25d

German class: 87 b-3/05

Number- · 1283 769

File number: P 12 83 769.3-15 (J 23711)

Filing date: May 15, 1963

Opening day: November 21, 1968

The invention relates to a hammer with slidably guided in a hollow cylinder Drive piston and one connected to it via a vibrating air cushion Striker, which is held in. By a clamping piece housed in the front part of the hammer housing a front, ineffective position is to be locked. This is to ensure that the Impact energy transmitted to the working tool when it is lifted from the driving position Hammer and with the engine still switched on, cannot perform any blank strokes that would otherwise occur transferred to the hammer case and had a very detrimental effect as a result.

In known impact hammers of the above type, the impact striker consists in its front, ineffective Position locking clamping piece from a hollow cone, in which the correspondingly conical the front end of the hammer is pushed in when the hammer is lifted from the work site and so that the striker is held. However, this type of stopper fixing requires one Manufactured with great accuracy and mostly slotted lengthways for the purpose of better clamping Hollow cone body. The latter is also due to its pure frictional effect not able to to hold the striker with certainty in its forward, ineffective position. It happens a lot before that when lifting the hammer from the driving point and also when inserting the striking tool the striker releases from its locking position in the clamping cone. If then the hammer is vertical or is held or placed at an angle upwards, the striker can move as a result of the escape of the between The cushioning air located in the anvil and the drive piston approach the drive piston and even put on the latter. If the hammer is then put back into operation, it strikes the drive piston depending on its position more or less hard on the hammer, which is too strong Impact loads on all parts of the device and undesirable repercussions on the gear unit. In order to avoid such damage to the device, it is known to temporarily lock the anvil with the drive piston by means of a clamping effect. bind, namely that one provides a cylindrical recess on the back of the anvil, in which penetrates a conical projection present on the front of the drive piston in a clamping manner. In this case, however, the hammer must first be dismantled in order to start up again, then the striking hammer manually from the driving hammer

Applicant:

Impex-Essen GmbH, 8800 Ansbach

Named as inventor:
Fritz Lang, 8800 Ansbach

piston pulled off and the hammer reassembled, which is accordingly cumbersome and requires time-consuming handling.

The invention is based on the object of creating a percussion hammer, the impact striker of which is included hammer lifted from the driving point as well as when changing the striking tool with the tool tip pointing upwards with simple means in its front, avoiding blank strokes Position is held securely and at the same time impact blows during the impact work can be kept away from the hammer housing as far as possible. This is a task for a Percussion hammer of the type mentioned at the outset is achieved according to the invention in that the striker in its front, ineffective position locking the clamping piece consists of a flexible clamping ring, at the same time as a rear support stop for a slidably mounted in front of the hammer housing, the hammer tool receiving guide body is used. This makes with the simplest Means ensures that when the hammer is lifted from the driving-in point, the hammer in its front position is reliably held and thus is unable to execute any blank strokes. There the guide body for the percussion tool is not on a rigid stop while the percussion hammer is being used, but rests against the resilient clamping ring, it is also ensured that the through the the vibrations caused by hard impacts of the striker on the guide body Hammer housings are transferred, which is particularly advantageous when machining hard materials, because then the impact repercussions are particularly large.

The impact body advantageously has a concentric end at its end facing the guide body Annular groove in which the flexible clamping ring is in the lifted or inoperative position of the hammer engages. The anvil locking is not only done by a pure frictional connection,

809 638/1491

but as a result of the engagement of the clamping ring in cylinder 2, slidably mounted hammer 5

the Döpper ring groove also positively connected to what, in such a way that the latter in the

secure locking of the striker is essential. Forward movement of the piston out of phase

The clamping ring is expediently driven forward as an O- or round-

formed cord ring, which is preferably tightened from rubber 5 accordingly. In the cylinder wall

or similar resilient material are made in a known manner passage openings 2 'provided

is. As a result, the effort for the Döpper- see, the air balance of the air cushion 4

Locking is extremely low, especially since it is used for handicrafts.

Usual O-rings or O-rings are used. The striker 5 has on its front

can. io end an annular groove 5 ', which with the in the front

It should be mentioned here that, in the case of motor-driven part I 'of the hammer housing 1, it cooperates with the lower hammering hammers to be driven by a drive-piston clamping ring 6 in the manner described below and with an interposed air cushion. On the striker 5 donating impact striker is already known, in the turned side of the clamping ring 6 is a flexible 15 housing part Γ of the guide body 7 longitudinal displacement clamping piece in the form of a tubular borrowed in the front front part of the hammer housing. The latter is used to accommodate the rubber piece. This piece of rubber is shank 8 of the hammer tool,
It also has the effect that at idle at vertically after at the in FIG. 1 the position shown above is the hammer directed above whose impact tool percussion hammer is in its operating position, that is, it does not perform any hammer blows. It is used, however, 20 tools are placed on the work surface. Not to hold the SchlagdÖppers or one here through the existing intermediate anvil receiving the tool shank 8, but only as a guide body 7 pushed back so far that he support stop for the rear end of the work with its rear, conical tool that with each transition in the working position end 7 'comes to rest on the clamping ring 6,
with its sharp edge on the rubber piece. Fig. 2 shows the impact position of the hammer must be guided until the latter enters a groove in the work person 5, that is, the position in which it generates its impact energy. Here is the constant tool 8 on the guide body 7 and thus on the rubber piece during the hammer work.

In Fig. 3, the inoperative position of the impactor is subjected to wear and tear imminent wear and tear and the functional 30 hammers shown, so in the hammer of the wise of the hammer. Drive-in point is lifted. Since the hammer 5

In order to prevent under all circumstances that, in this case, when hitting the guide anvil in the inoperative position of the striker on body 7 due to the latter no significant the drive piston can come to rest, if the resistance is more experienced, he can go much further An axially displaceable snap-off 35 snap forward. This catches itself on his fore-end pin provided, the annular groove 5 'attached from the annular groove side in the elastic opposite, so rear end face of the clamping ring 6, whereby the anvil in its front Döppers protrudes and is under spring pressure. Before the position is held securely, that is, in contrast to the This spacer bolt partially protrudes beyond the rearward drive piston 3 and does not have any further lifting or impacting parts But the face of the striker is only so far out that 40 more movement is carried out.

that when the hammer is in operation it does not work in the embodiments shown in FIGS hits the drive piston. As a result of these examples, the striking striker 5 has an axial direction Stand bolt is an additional security displaceably mounted spacer bolt 10, which is made of created for the fact that the striker does not fall on any of the striker face case lying opposite the annular groove 5 ' hits the drive piston, rather protrudes between 45 page. Those with a 10 'collar stop the latter and the anvil always have a certain amount of residual bolts 10 that are always under action Air cushion is retained, so that when a spring is restored, 9. The bolt weight and the spring switch on the impact hammer no hard impact pressure are in a certain ratio zueindes Drive piston on the hammer is possible. other, which depends on the impact velocity

In the drawing, several according to the invention 50 speed of the SchlagdÖppers 5 is to be selected so that in

Procured embodiments shown. The moment of its impact on the guide body 7

show little or no axial movement of the BoI

F i g. 1 to 3 the front part of an axial zens 10 is possible. Through the spacer 10

Longitudinal section shown hammer with in ver is prevented that when held upwards or

Different positions located hammer 55 parked hammer the hammer 5 itself

and drive piston, approach the drive piston 3 or on this to

4 and 5, two differently designed systems can come, as shown in FIG.

Striker with spacer bolts, is. Through the spacer bolt 10, the

6 shows the striker 5 resting on the drive piston, rather only so far from the piston

Approach the hammer and 60 until the bolt 10 is on the piston face.

Fig. 7 which strikes by the spacer bolt from the, as shown in FIG. 7 is shown. In this way

Drive piston kept away striking anvil. remains between the striker 5 and the piston 3

In the hammer shown, there is always a certain residual air cushion 4 in it, see above

Hammer housing or housing tube 1 of the hollow cylinder that when switched on again no hard metallic material

2, in which the impact of the piston 3 on the striker 5 by a motor 65 (not shown) is possible

with gear driven piston 3 is a reciprocating. The forward stroke of the drive piston is often

Can perform float. The drive piston 3 more only the spacer bolt 10 somewhat in the

is driven in via the air cushion 4 with the also in the hollow anvil 5. After a short start-up phase

the air cushion fills up again to its original volume and then only mediates the Impact energy transfer. The spacer bolt 10 thus provides an additional safeguard against a complete return movement of the striker 5, so occurs especially in those exceptional cases to the effect when the striker is occasionally out of its locking position held by the clamping ring 6 should still be released, as z. B. with a correspondingly strong, unwanted Impact loading of the hammer could sometimes be the case.

Claims (6)

Patent claims: 1. Impact hammer with a drive piston and a with it via a swinging air cushion in connection with the hammer, which is driven by a Clamping piece housed in the front part of the hammer housing in a front, ineffective Is to be locked position, characterized in that the clamping piece from a resilient clamping ring (6), which also acts as a rear support stop for a before that in the hammer housing (1) slidably mounted, the hammer tool (8) receiving Guide body (7) is used. 2. Percussion hammer according to claim 1, characterized in that the striking anvil (5) on his the end facing the guide body (7) has a concentric annular groove (5 '), in which the resilient clamping ring (6) engages in the inoperative position of the percussion hammer. 3. Impact hammer according to Claims 1 and 2, characterized in that the clamping ring (6) is designed as an O-ring or O-ring and is preferably made of rubber or the like resilient material. 4. Impact hammer according to claims 1 to 3, characterized in that the guide body (7) on its rear, the clamping ring (6) has a support cone (7 ') facing the end. 5. Impact hammer according to claims 1 to 4, characterized in that from the the annular groove (5 ') opposite end face of the striker (5) an axially displaceably mounted in the latter, The spacer bolt (10) under spring pressure protrudes. 6. percussion hammer according to claims 1 to 5, characterized in that the spacer bolt (10) protrudes over the face of the striker (5) only so far that it does not hit the drive piston in the operating position of the hammer (3) hits. Considered publications:
Austrian Patent No. 220 102;
U.S. Patent Nos. 3,032,998, 3,034,302. 1 sheet of drawings 809 638/1491 11.68 ® Bundesdruckerei Berlin