NL2003834C2

NL2003834C2 - Multipart quick-change and plug eject arbor for a hole saw.

Info

Publication number: NL2003834C2
Application number: NL2003834A
Authority: NL
Inventors: Hubert Gillissen
Original assignee: A V Custom Style B V
Priority date: 2009-11-19
Filing date: 2009-11-19
Publication date: 2011-05-23

Description

-1 -

MULTIPART QUICK-CHANGE AND PLUG EJECT ARBOR FOR A HOLE SAW

The present invention relates to a quick-change arbor 5 comprising a shaft and means for attaching a tool, which are provided with a hole for sliding the shaft therein, and provided with locking means for rotationally and/or axially-locking the attachment means to the shaft.

10 The present invention also relates to attachment means for application in the quick change arbor.

Such an arbor is known from applicants international application published under WO 2006/062388. The known arbor 15 comprises a shaft and attachment means for a tool, in particular a hole saw, which means have a hole for advantageously pushing a plug of sawn material out of the hole saw 'the plug pushing feature' by sliding the shaft through the hole in the attachment means. The attachment 20 means holding the tool are provided with rotationally locking means and axially locking means for securing onto the shaft which has one end for rotationally driving the shaft, such as by a drilling machine. In one possible embodiment the arbor consisting of three parts may be 25 simplified to only two parts by integrating the attachment means in the hole saw tool.

It is an object of the present invention to provide a further developed quick change arbor and tool change system 30 which has practically similar advantages as the known arbor, but which can be manufactured at a further reduced cost price .

Thereto the quick-change arbor according to the 35 invention is characterised in that the attachment means are - 2 - made up of mutually engaging parts, whereof one engaging part is embodied to be provided on the tool, and whereof at least one of the engaging parts is provided with at least one of said locking means.

5

It is an advantage of the quick-change arbor according to the present invention, that although the main stream tendency is to provide an arbor having as few parts as possible, the inventor surprisingly found that by 10 breaking the attachment means apart in mutually engagable parts this provides possibilities for a reduction of costs in the manufacturing of the arbor and system according to the invention.

For example if it is desired to integrate the 15 attachment means into the arbor now only the part which is most easily and cheap to manufacture can be provided, at wish permanently fixed, onto the hole saw or other tool, as this one simple part may at wish not have any of the rotationally and/or axially locking means.

20 However further advantageously if so wanted the simple part may be provided with the rotationally locking means, in practise often the hexagonal internal and external cross sections of hole and shaft respectively. So this results in a surprisingly broad constructional freedom 25 which also creates additional commercial value.

Al the more surprising is the fact that the advantages of applicants prior development such as to the 'plug pushing feature' mentioned earlier are maintained, while nevertheless the above additional advantages are 30 added thereto.

Further advantageous embodiments of the quick change arbor and system according to the invention are outlined in the dependent claims.

35 - 3 -

At present the quick change arbor will be elucidated further together with its additional advantages while reference is being made to the appended drawing, wherein similar components are being referred to by means of the 5 same reference numerals. In the drawing:

Fig. 1 shows a largely exploded view of an embodiment which is preferred at present of the quick-change arbor according to the invention; and

Fig. 2 shows the assembled arbor of fig. 1.

10

Figs 1 and 2 show an embodiment of an example of a quick-change arbor 1, which will hereafter be elucidated further. The arbor 1 may in general be coupled to a tool, in particular but not exclusively as shown, to a hole saw 15 2. Other tools which may possibly be coupled to the arbor 1 are for example a cutter, a circular saw, a drill, a polishing disc or layer, a brush, a bore tool, a grinding tool or the like tools, in order to create a multi purpose tool change system.

20 The quick-change arbor 1 comprises a shaft 3 having a drive end 4 and a tool end 5 and means 6 for attaching the tool, hereafter generally referred to as attachment means 6. The attachment means 6 are provided with a central through going hole 7 such that a sliding and even a 25 releasing of the attachment means 6 over the shaft 3 is possible. The attachment means 6 also have means 8, 9 to be described hereafter for rotationally and axially respectively locking the attachment means 6 onto and into the shaft 3. These means will hereafter be designated as 30 rotationally locking means 8; 8-1, 8-2 and axially locking means 9; 9-1, 9-2 whereby the means 9-1 are shown to be manually releasable axially locking means.

The attachment means 6 are made up of mutually engaging parts 6-1 and 6-2, whereof one engaging part 6-1 35 is embodied to be provided on the tool 2, and whereof at -4 - least one of the engaging parts 6-1 and/or 6-2 is provided with at least one of said locking means 8-1, 9-1. In fig. 1 it is shown that both the rotationally locking means 8-1 and the axially locking means 9-1 here embodied by a latch 5 in particular a transverse latch are on the second engaging part 6-2. It is possible to implement the means 8-1 in the hole 7' present in the first engaging part 6-1. Hole 7 may then be round and not provided with here an hexagonal internal cross section.

10 So as shown the rotationally locking means 8 comprise first rotationally locking means 8-1 provided on the part 6-2 and embodied by the form of the cross section of the hole 7, and second rotationally locking means 8-2 embodied by the external form of the shaft 3. These forms correspond 15 in such a way that the first and second rotationally locking means 8-1 and 8-2 are slidable relative to one another. The form of the cross section of the hole 7, 7' and the corresponding external form of the shaft 3 are such that in rotationally locking condition rotation relative to 20 one another is blocked. Possible other cross sections and corresponding external forms are for example at least partly or substantially oval, polygonal, such as hexagonal or square. It is also feasible to provide one or more flattened areas the abovementioned forms in order to 25 prevent relative angular rotation.

When the drive end 4 is coupled to a drill or drilling machine rotation of the shaft 3 will then be transferred through possibly both engaging parts 6-1, 6-2 to the tool, such as the hole saw 2 coupled thereto.

30 The axially locking means 9 comprise first axially locking means 9-1, here simply embodied by a latch 9-1 provided on the engaging part 6-2, and second axially locking means 9-2, here embodied by a notch 9-2 on the shaft 3 for locking the latch 9-1 therein. The latch 9-1 35 and notch 9-2 as shown are transverse to the longitudinal - 5 - axis of the shaft 3. Axial movement of at least the part 6-2 relative to the shaft 3 is thus blocked if the latch 9-1 falls in the notch 9-2. Such a latch if for example used in an electric drill will normally be manually operable. The 5 latch itself can be elastic and/or can be loaded elastically, such that it can be depressed or switched easily. In the embodiment as shown the latch may be a spring loaded latch. In general the latch 9-1 will be a radially operable latch 9-1 and can also be embodied by a 10 catch falling into a hole in the shaft 3. The notch 9-2 is a groove, as shown an annular groove such that in any angular position of the part 6-2 on the shaft 3 the latch 9-1 can effectively fall into the notch 9-2.

Although the part 6-1 may be integrated that is 15 permanently fixed or united with the tool 2, the part 6-1 and the tool 2 may comprise coupling means (not shown), in particular releasable coupling means for coupling the part 6-1 to the tool 2.

The tool end 5 is provided with an axial hole for 20 accommodating a drivable end of a tool, such as here a pilot drill 10. The drivable end of the pilot drill 10 and the tool end 5 of the shaft 3 may be provided with corresponding drill chuck 11 for attaching and detaching the pilot drill 10. These means may be a click closure, 25 some clamp means, or screw thread on both the drivable end 10 and in the axial hole at the tool end 5 of the shaft 3.

It is preferred to manufacture the arbor 1 and its parts from hardened steel, however for example the first engaging part 6-1 may be manufactured from a suitable 30 plastic.

The particular embodiment as shown has mutually non-rotatable parts 6-1, 6-2 which have complementary forms 12 fitting into one another. In this case where the locking means 8-1 are on the part 6-2 the complementary forms 12 35 each have interlocking trapezoidal -dovetail- cross - 6 - sections capable of conveying torque to the tool 2. Here as shown the engaging part 6-1 is provided with a notch 12-1 having a trapezoidal axial cross section and the other part 6-2 is provided with an embossment 12-2 having a fitting 5 corresponding cross section. Notch 12-1 and embossment 12-2 can be shifted relative to each other in perpendicular direction to the shaft 3 in order to make or break their connection. The shaft 3 if inserted through the holes 7, 7' locks the complementary forms 12 into each other and 10 prevents this locking arrangement from inadvertently coming loose. Other possible arrangements are a bayonet arrangement in which case the parts 6-1, 6-2 in order to lock them may be put onto each other and rotated until they arrest, or some possibly spring loaded clamping pin 15 arrangement on the parts.

If desired the engaging parts 6-1, 6-2 may be provided with snatching or stop means 13 in order to secure and have them spring loaded snap in a proper position relative to each other upon shifting.

20 If the locking means 8-1 are on the part 6-1 in the hole 71 then the forms 12 may be manufactured less sturdy as in that case the conveying of torque through the part 6-2 to the part 6-1 is not required. The forms 12 may then be embodied by magnetically attracting surfaces.

Claims

A quick-change tool comprising an axis and attachment means for a tool which are provided with a hole for displacing the axis therein and are provided with locking means for locking the attachment means against rotation and / or axial displacement on the axis, characterized in that the fastening means are made up of mutually connectable parts, one part of which is designed to be mounted on the tool, and at least one of the parts is provided with at least one of the aforementioned locking means.

A quick-change tool according to claim 1, characterized in that the mutually connectable parts are two mutually rotatable parts.

3. Quick-change tool according to claim 1 or 2, characterized in that the connectable parts have complementary shapes that fit into one another.

4. A quick-change tool according to any one of claims 1-3, characterized in that the connectable parts are each provided with snap or latching members.

5. A quick-change tool as claimed in any of the claims 1-4, characterized in that the one connectable part is provided with a cavity with a trapezoidal axial cross-section and the other part is provided with an upstand which can be slid into the cavity perpendicular to the axis with a corresponding cross section.

6. A quick-change tool as claimed in any of the claims 1-5, characterized in that the one connectable part can be fixed to the tool, whether or not releasably, or that the one connectable part is integrated in the tool.

A quick-change tool according to any one of claims 1-6, characterized in that the external cross-section of the shaft that is slidable in the hole of the connectable parts fits non-rotatably with the internal cross-section of the hole in at least one of the 10 interconnectable parts.

8. A quick-change tool according to claim 7, characterized in that the shapes of said internal and external cross-sections are complementary to each other, such as being oval, polygonal, such as octagonal or square, or having at least partially flattened surfaces.

9. A quick-change tool according to any one of claims 1-8, characterized in that the shaft is provided with an at least partially circumferential notch.

10. A quick-change tool as claimed in any one of claims 1-9, characterized in that the aforementioned other connectable part has axial displacement of the part preventing members over the shaft 25, in particular rivets falling into the notch of the tool of claim 9, has particularly spring-loaded and manually operable latch members.

A quick-change tool according to any one of claims 1-10, characterized in that at least one of the coupling parts is made of plastic, metal and / or steel, such as hardened steel.

A quick-change tool according to any one of claims 1 to 11, characterized in that the tool is a hole saw, and the shaft is coupled to a drill guide with a smaller outer diameter than the diameter of the shaft for pressing a hole saw out of the hole saw. plug sawn 5 material.

A quick-change tool according to claim 12, characterized in that the shaft is provided with a drill jaw for attaching and loosening the drill guide. 10

14. Tool change system comprising the quick change tool according to any of claims 1-13, and a tool, such as a hole saw, a cutting tool, a circular saw, a drill, a polishing disc or layer, a brush, a drill tool, a grinding tool, a grindstone or similar tools.

15. Fastening means for a tool which are provided with a hole for displacing an axis therein, and are provided with locking means for locking the fastening means against rotation and / or axial displacement on the axis, characterized in that the fastening means consist of mutually connectable parts are built up, one part of which can be arranged on the tool and at least one of the parts is provided with at least one of the aforementioned locking means.