DE7921717U1 - ADD-ON DEVICE FOR ELECTRICALLY POWERED HAND DRILL - Google Patents

Description

• it ··· · *

CfI ··· · »t

Attachment for an electrically operated hand drill

The invention relates to an attachment for an electrically operated Hand drill with built-in hammer mechanism. Attachments of this type are known and create the possibility of the hand drill can also be used in other ways by means of appropriately designed attachments, for example as a hand-held circular saw, as a grinding device or the like .

All known attachments only use the rotational movement the drill off, so that when using all of these attachments the built-in hammer mechanism of the drill is not used.

The invention is based on the object of creating an attachment device which primarily enables the use of the built-in striking mechanism. With such an attachment, ram-like tools such as chisels, sharkamers, knives or the like can be used. The scope of a hand drill is determined by its use such an additional device is significantly expanded, which is particularly advantageous for do-it-yourselfers.

According to the invention, this object is achieved in that in extension the drive shaft of the drill a ram-like tool is mounted in its longitudinal direction so that a on the attachment, spring supporting the rear end of the tool presses against an impact head attached to the drive shaft. The ram-like tool lies with its longitudinal axis in the imaginary extension of the axis of the drive shaft and is at activated percussion mechanism by the joint action of the percussion head on the drive shaft and the built-in spring set a beating movement.

Chisels are known as tools for processing stones or masonry used: to be; but it is also possible to use the striking tool Not to be provided with a Harx: head, for example to make metallic To give surfaces a so-called hammered appearance. With an appropriate design of the tool, it is also conceivable driving nails with the attachment device according to the invention. One Another of the many possible uses is the use of knives or chisels to work with wood.

A favorable design of the attachment is achieved by that the rear Ξηάε of the ram-like tool with a widening is provided in order to keep the effects of the constant hitting of the striking head on the tool to a minimum.

With another. Form of training that pursues the same goal, the rear end of the pestle-like tool is dome-shaped designed and is accommodated in a correspondingly concave Recess of the impact head.

A particularly advantageous embodiment results when the plunger-like Tool is embedded in two spaced guide bearings. It is recommended for this form of training

• I I I

to arrange the spring between the two guide bearings.

In most cases it will be necessary or advantageous to prevent the tool from rotating about its axis. In these cases, the ram-like tool must be secured against rotation about its longitudinal axis by appropriate means.

The hammering movement of the tool is transmitted to the attachment by the built-in spring. To prevent the attachment from slipping To prevent the hand drill from these effects, it is proposed to connect the device of the attachment to the hand drill with means that prevent slipping. For this, for example a groove on the drill and a corresponding bead on the attachment or cams and corresponding recesses related will.

The invention is described using two exemplary embodiments:

Fig. 1 shows an attachment for a drill with simultaneous Use of the usual drill chuck. Commercially available drilling machines (1) are in most cases with a cylindrical Shank (2) provided for connecting attachments or holding devices. The housing (3) of the attachment shown in section is provided with a known cuff-like connection device (4) and clamped on the shaft (2).

In the front area, the attachment has a housing (5) with parallel walls, which has an outlet opening (7) for the plunger-like tool (8) on its end face (6).

It is unimportant for the invention whether the housing (5) has a round, rectangular or some other type of cross-section. It serves as a guide for the rear widening (9) of the tool .

If a possible rotary movement around the longitudinal axis of the tool is to be switched off, it is recommended that the housing (55 and to form the widening (9) angular or out of round. But there is also the possibility of rotating the tool to be eliminated in that 'the tool (8) and the outlet opening (7) are given an angular or non-circular cross-section.

In the embodiment according to FIG. 1, the usual Chuck (lo) of the hand drill clamped a hammer head (11). The beating effect of the tool (8) is achieved in that a spring (12), one end of which is at the Gebäuseatschluss (6) is supported with its other end against the Press the widening (9) and thus with the striking movement during operation for constant contact between the tool (8) and impact head (11) ensures.

In this embodiment, a normal chisel for working stones or masonry is used as a ram-like tool intended.

Fig. 2 shows an embodiment in which a rounded Hammer head (13) used for machining metal surfaces' is. While the front guidance takes place here again in the outlet opening (7), it is for the rear guidance of the tool a removable disc (14) is provided. As mentioned in the description of Fig. 1, it does not matter here either whether the housing (5) and the guide disc (14) have a round, non-round or even angular cross-section. The removable The washer (14), which serves as an abutment for the spring (12), is held on the tool (15) by a pin (16).

On the drive shaft (17) there is a nut (18), the head (19) of which a has concave recess (2o), which the Kalottenformigen

rear end (21) of the tool (15) is adapted.

to prevent the device from slipping when the striking mechanism is actuated to prevent from the drill, in the embodiment according to Fig. 2, the cylindrical shaft (2) provided with a circumferential groove (22) and the attachment at its connection point with a corresponding bead (23).

In addition to the two exemplary embodiments described here, it is also possible, instead of a closed housing (5), to use a Provide fork-shaped storage for the ram-like tool.

Claims (7)

Dipl.-Ing. H. Schliep'häclld:. j Consulting engineer Vümembergstraße 18 - D-4C3 Raringen 6 (Hösel) Attachment for an electrically operated hand drill 1. Vorsatzgevät for an electrically operated hand drill with built-in striking mechanism, thereby characterized in that in extension of the drive shaft (17) of the drill (1) a ram-like Tool (8, 15) is movably mounted in its longitudinal direction so that one supported on the attachment Spring (12) presses the rear end of the tool against an impact head (11, 19) attached to the drive shaft. 2. Attachment according to claim 1, characterized in that the plunger-like tool (8) on has a plate-shaped widening (9) at its rear end. 3. Attachment according to claim 1, characterized in that the plunger-like tool (15) its rear end (21) is dome-shaped. 4. Attachment according to claim 1, characterized that for the ram-like tool two spaced guide bearings (7, 9, 14) are provided. 5. Attachment according to claims 1 and 4, characterized in that the spring (12) between the two guide bearings is arranged. Front attachment according to Claim 1, characterized that the ram-like tool against Verdrei: una is secured about its longitudinal axis. 7. Attachment according to claim 1, characterized that his device (4) for connection to the hand drill (1, 2) has means (22, 23) which prevent slipping.