GB2321608A - Holding device - Google Patents

Abstract

A holding device 10 for drilling implements has a base plate 12 for fastening the holding device to a contact surface. Provided between base plate 12 and the contact surface is a sealing edge 18 which seals off a suction chamber 19. The holding device further comprises a sealing body 30 which is used to connect the suction chamber (19) to a suction pump. Disposed in the sealing body 30 is a safety valve (35,Fig.2) having a closing body (36,Fig.2) which closes in the direction of a flow directed towards the suction chamber.

Description

1 Holding device far drilling iMlements

Background art

2321608 The invention proceeds from a holding device for drilling implements according to the preamble of claim 1. A holding device is already known (DE 34 34 260 AI), which comprises a base plate for fastening the holding device to a contact surface such as a floor, wall, ceiling or the like, a sealing edge being provided between base plate and contact surface so as to form a suction chamber, and which comprises a connection line used to connect the suction chamber to a suction pump. The drawback of said holding device is that, in the event of failure of the suction pump or a leak in the connection line to the suction purnp, a vacuum in the suction chamber is reduced relatively quickly with the result that the suction action between base plate and contact surface diminishes relatively quickly. A sudden pressure drop in the suction chamber, particularly when working on walls or ceilings, may lead to detachment of the holding device, possibly resulting in damage to the drilling implement or even injury of the operator.

Holding devices for drillmig implements are moreover known which, prior to the 2 0 drilling process, are fastened to the contact surface by means of at least one plug. This guarantees good support of the holding device on the contact surface but involves damage to the contact surface.

Advantages of the invention The holding device according to the invention having the features of claim 1 has the advantage that a sudden pressure drop mi the suction chamber is avoided. By virtue of the measures indicated in the dependent claims, advantageous developments and ninprovements of the holding device according to the invention are 30 possible.

2 It is particularly advantageous to house all of the parts needed for the suction connection m a suction connection part which is attachable to an oblong hole for plug fastening of the base plate. It is therefore possible to use a structurally identical base plate both for plug fastening and for suction fastening without the base plate itself 5 having to be eqw"pped with expensive accessories.

Drawm"gs An embodiment of the invention is illustrated in the drawings and described in detail 10 below. Figure 1 shows a basic view of a known holding device for drilling implements, Figure 2 a perspective view of the holding device according to the invention, Figure 3 a longitudinal section through a suction part, Figure 4 an inverted plan view of the suction paM Figure 5 a plan view of the suction part and Figure 6 a cross section through the suction part according to line VI-V1 in Figure 3.

Description of the embodiment

In Figure 1, 10 denotes a holding device for drilling implements, which comprises an upright 11 connected to a base plate 12. Said base plate 12 is used to fasten the holding device 10 to a contact surface 13. The contact surface 13 is formed, for example, by a wall, ceiling or floor. The upright 11 carries a drilling implement 14, which is used for the rotary drive of a drill bit 15. By means of the drill bit 15 holes may be drilled in the contact surface 13.

The previously known holding device 10 shown in Figure 1 is designed for plug-free application against a smooth contact surface 13. For said purpose, a circumferential sealing edge 18 is situated between base plate 12 and contact surface 13. Between base plate 12, contact surface 13 and sealing edge 18 a suction chamber 19 is formed, by means of which the holding device 10 may be sucked tightly against the contact 3 0surface 13. The suction chamber 19 is provided with a coupling 20 for connecting 3 the suction chamber to a suction pump (not shown). Said connection between the connection line 20 and the suction pump is usually effected by a flexible hose 2 1. For fastening the holding device, the base plate 12 is placed against the contact surface 13 and aligned by means of a handle 22. By virtue of evacuation, a vacuum is then produced in the suction chamber and causes the base plate 12 to adhere to the contact surface 13.

Figure 2 shows a perspective view of a holding device 10 according to the invention. For parts of an identical action to the construction according to Figure 1 the same reference characters are used. The drawing shows the upright 11, the base plate 12 connected to the upright 11, a removable, likewise circumferential sealing edge 18 for forming a suction chamber 19 underneath the base plate 12, and a handle 22. The upright 11 carries a slide 16, which is displaceable by means of a toothed rotary pin 17 relative to a gear rack profile 11 a on the upright 11. A drilling implement 14 may be fastened to the slide 16. The upright 11 is additionally supported by struts 23 relative to the basic body 12.

Situated in the basic body 12 is an oblong hole 28 leading through into the suction chamber 19 and used for plug fastening of the base plate 12. The oblong hole 28 is 2 0 hermetically sealable by means of a suction connection part 29 so that the holding device is also suitable for suction fastening.

The suction connection part 29 is equipped with all of the parts used for suction fastening. The base plate 12 need only be equipped with suction connection part 29 and optionally with the sealing edge 18 Mi order to effect a functional conversion of the holding device from plug fastening to suction fastening. The suction connection part 29 has a sealing body 30, which effects sealing in respect of the basic body in the region of a sealing surface 31 extending around the oblong hole. For indicating the pressure in the suction chamber 19, the suction connection part 29 is equipped with a manometer 32. The hose 21 is connected to the suction connection part 29.

4 Figure 3 shows the suction connection part 29 in section. The suction connection part 29 has a basic body 32a, which has a featherkey-like projection 29b for engagement into the oblong hole 28 and is of a corresponding size. The sealing body 30 is disposed in the transition region between the projection 29b, which engages into the oblong hole 28, and a circumferential shoulder 29c which covers the oblong hole 28.

For fastening the suction connection part 29 to the base plate 12, the projection 29c is inserted into the oblong hole 28, the suction connection part is pressed against the base plate 12 and locked by means of a locking bar 27, which is rotatable by means of a lever handle 26. The locking bar 27 engages through the oblong hole 28 and is supported in the suction chamber 18 at the underside of the base plate 12.

For the suction connection, the basic body 29a is provided with a first bore 20a, which extends substantially at right angles to a contact surface and is cut by a bore 20b extending substantially parallel to the contact surface. The bore 23b opens laterally of the basic body 29a and is widened towards the outside for the purpose of receiving a safety valve 35. Situated in the bore 23b is a valve closing body 36, which is pressed by a spring 3 8 agamist a valve seat 3 7 and closes the connection to the suction chamber 18. The spring 38 is supported against a coupling 39 for the hose 21 which is screwed into the basic body 29a. The safety valve 35 is operated in such a way that it opens only from a specific low pressure generated by evacuation (elfective working vacuum of the suction pump) in the suction line 21 and otherwise closes. The suction chamber 18 is therefore protected from a sudden pressure loss as a result of a reduction in the low pressure generated by evacuation in the hose 2 1.

Disposed in a bore 23c, which is aligned with the bore 23a and likewise opens towards the outside of the basic body 32, is an operating valve 40 (Fig. 6) which has a spring-loaded slide valve 41 seated 'm a transverse bore 23 d. The slide valve 41 is 3 0 movable by means of a button 43 counter to spring action into a position which opens the bore 23d so that the suction chamber 19 is then vented. Said venting enables alignment of the base plate 12 while the suction pump is in operation. Further disposed in the basic body 29a is the manometer 32, which has a through-connection 42 to the suction chamber 19.

Figure 4 shows the view of the suction connection part 29 from the direction of the suction chamber 19. Said view shows the sealing body 30, which embraces the oblong hole 28, and the locking bar 27, which is longer than the width B of the oblong hole 28.

Figure 5 shows the turning handle 30, the manometer 31 and the coupling 39. Also shown is a mouth hole 44 of the bore 20c.

Figure 6 shows the bore 23a, which is cut by the bore 23b and adjoined by the partial 15piece 23c. Said partial piece 23c is cut by a bore 20d, in which the slide valve 41 is seated. Ite slide valve 41 is connected to the button 43 and is preloaded by a spring 46 into its position closing the bore 23c. The spring 46 is seated in a blind end of the bore 20d.

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Claims (9)

1.

2.

3.

4.

5.

6.

Holding device for drilling implements having a base plate (12) for fastening the holding device (10) to a contact surface (13) such as, for example, a wall, floor, ceiling etc., having a sealmig edge (18) used to form a suction chamber (19) between base plate (12) and contact surface (13), and having a connection line (20, 2 1) for connecting the suction chamber (19) to a suction pump, characterized in that disposed m the connection line (20, 2 1) is a safety valve (3 5) which opens only from a preset minimum suction pressure in the connection line (20, 2 1) onwards.

Holding device according to claim 1, characterized in that the base plate (12) has an oblong hole (28) for plug fastening.

Holding device according to claim 2, characterized in that the oblong hole (28) is closable by means of a suction connection part (29).

Holding device according to claim 3, characterized in that the safety valve (35) is disposed in a basic body (29a) of the suction connection part (29).

Holding device according to claim 4, characterized in that the safety valve (35) comprises a valve closing body (36) which is pressed by a spring (38) counter to the direction of evacuation from the suction chamber (19) against a valve seat (37).

Holding device according to claim 4 or 5, characterized in that a coupling (39) for connecting a suction hose (21) is provided on the basic body (29a).

7 7.

8.

9. A holding device for drilling implements substantially as herein described with reference to the accompanying drawings.

c

9.

Holding device according to one of claims 3 to 6, characterized in that an operating valve (40) for venting the suction chamber (19) is disposed on the suction connection part (29).

Holding device according to one of claims 3 to 7, characterized in that the suction connection part (29) has a manometer (32), which is connected by a connection (42) to the suction chamber (19).

A holding device for drilling implements substantially as herein described with reference to the accompanying drawings.

-9.

Amendments to the claims have been filed as follows CLAIMS 1. A holding device for drillmig implements comprising a base plate for fastening the holding device to a contact surface such as, for example, a wall, floor, 0 line, etc., a sealing edge which, in use, forms a suction chamber between the base cel. plate and the contact surface, and a connection line for connecting the suction chamber to a suction pump, in which connection line is disposed a safety valve which opens only when at least a preset minimum suction pressure is present in the connection line.

1) A holding device accordmig to claim 1, wherein the base plate has an oblong hole for plug fastening.

1 A holding device according to claim 2, where the oblong hole is m 15 closable by means of a suction connection part.

4. A holding device according to claim 3), wherein the safety valve disposed mi a basic body of the suction connection part.

is 1 5. A holding device accordmig to claim 4, wherein a coupling for connectina a suction hose is provided on the basic body.

c 6. A holding device according to any of claims 3 to 5, wheremi an operating valve for venting the suction chamber is disposed on the suction connection 25 part.

7. A holding device according to any of cl - - to 6, wherein the suction aims.3 connection part has a manometer, which is connected by a connection to the suction chamber.

-q- 8. A holding device according to any one of the preceding claims, wherein the safety valve comprises a valve closing body which is pressed by a spring counter to the direction of evacuation from the suction chamber against a valve scat.