DE102008045976A1 - Multipart, detachable billiard bar, has coupling parts arranged at shaft part and at hub part between upper part, lower part and extension part, where coupling parts are in form of shaft/hub connections with circumferential surfaces - Google Patents

Abstract

The billiard bar (1) has an upper part (2), a lower part (3) and an extension part (4), which are connected by coupling parts. The coupling parts are in the form of shaft/hub connections with circumferential surfaces and are arranged at a shaft part (5) and at a hub part (6) between the upper part, the lower part and the extension part, where the circumferential surfaces deviate from a circle. A bolt of the shaft part and a casing of the hub part are provided with surface structures with which the upper part, the lower part and the extension part are fastened.

Description

The The invention relates to a multipart billiard bar with devices for separating and connecting the parts of the billiard stick.

Especially The big snooker billiard tables keep coming up the need to extend the billiard bar so that the ball to be played can be reached. This is to the lower part of billiard bar managed by the player, an extension piece stated. As a rule, this serves a screw connection.

to Time saving should be done this extension very quickly and quickly reversed can. However, a screw connection requires some Time to screw on and off again. A quick attachment and removing an extension would make it Allow players, except an extension of the Billardstabes also a larger mass exhibiting Handpiece if this is for a strong Shock seems appropriate. For lack of time However, this option is usually waived.

in the U.S. Patent 4,231,573 discloses a two-piece billiard bar, in which the connection of the lower and upper part is made by offset transversely to the longitudinal axis of the billiard rod circular pins or holes in the counterpart, which are plugged into each other and twisted. The staggered pins wedged in the holes and connect the two parts by a slight twisting by less than 90 °. However, this solution has the disadvantage that the two parts are not fully aligned, it remains between them a lateral offset.

From the GB 2 226 251 is a two-piece billiard bar has become known in the lower and upper part of a billiard bar are coupled together by a kind of bayonet lock.

Also Here is sufficient a rotation angle of about 90 ° to the two parts to connect or disconnect.

Screw connections between the lower and upper part of a billiard rod in the form of conical thread according to GB 2 246 302 also allow quick connection and disconnection of top and bottom.

The The invention has for its object to provide a device by means of which a piecing required in the course of the game an extension to a billiard bar can be achieved which is done quickly and by the highest coaxiality between lower part and extension is given. She dissolves this task by using a shaft / hub connection is, preferably at the extension as Shaft to be addressed with pin deviating from the pure circular shape Peripheral surface is attached, the one to be addressed as a hub Bore in the bottom of the billiard bar is inserted, the one matched to the peripheral surface of the pin inner circumferential surface having. When twisting by a few degrees wedge pin and bore and connect base and extension immovable together.

A Such, deviating from pure circular shape peripheral shape of shaft and Hub is, for example, given by ellipses small diameter difference.

Especially advantageous, however, if pin and bore peripheral surfaces have, which - on the pin - of a small Diameter gradually increase and then steep again fall to the initial diameter, while the complementary Cam in the bore on a slightly smaller circumference lie. This creates a joint gap between shaft and hub, which allows easy insertion of the pin into the hole. This joint gap is made by twisting extension and lower part in the direction of the flat slopes of the billiard bar lifted, with pin and bore wedged.

The Shaft / hub connection may include one or more cams. Especially advantageous are three such offset by 120 ° around the circumference Cams, as this is a very much by the twisting of the two parts exact centering is achieved. The slope of the cam can with 1:20 to 1:50 are chosen so low that already by a Twist by about 15 ° a secure wedging the peripheral surfaces is reached.

Such a shaft / hub connection is from the DE 42 09 153 C2 known and introduced in mechanical engineering as 3K connection. The disclosure of this patent is incorporated by reference.

By the ability to quickly add an accessory to a pool bar To attach, this can also be used to, the mass of the billiard bar through an extension made of heavy material such as steel or to increase the shock pulse for strong To increase shocks.

The approximately one and a half meters long billiard bars are usually dismantled in the middle in the upper part and lower part to be transported more comfortably. The proposed shaft / hub connection can therefore be used advantageously between the upper part and the lower part of the billiard rod the. In this case, upper part and lower part can be easily and quickly separated or connected, in particular, when using a 3K connection absolute coaxiality of the parts is guaranteed.

Further advantageous embodiments are the subject of dependent claims.

In The drawing is an embodiment of the invention shown. She points in

1 the shaft part in longitudinal section;

2 the hub part in longitudinal section;

3 the shaft / hub connection in cross-section in joining position;

4 the shaft / hub connection in cross section in frictional engagement position;

5 the billiard bar as a whole.

A billiard bar 1 consists of top part 2 , Lower part 3 and an extension to be attached to the lower end of this base 4 , To connect the lower part and extension is a shaft / hub connection with a shaft or pin part 5 and a hub or bore part 6 according to the 2 and 3 , The pin part is preferably located in the extension 4 , the hole part in the lower part 3 , Shaft or spigot part and hub or bore part are preferably made of metal such as steel or brass, and execution in plastic is possible and advantageous in some cases.

The shaft or pin part 5 has a freestanding pin to be addressed as a shaft 7 and a bolt 8th on, by means of it in the lower part 3 is attached. Between pin and bolt is a vertical to the center axis disc 9 arranged. The hub or bore part 6 consists of a sleeve to be addressed as a hub 10 , which may be closed at its inner end and also a disc on its exposed side 11 having.

How out 3 recognizable, the pin points 7 on its circumference three offset by 120 ° cams 12 on, by an imaginary cylindrical surface 13 gradually rise and then fall steeply back to the cylinder surface. The sleeve 10 is on its inner surface also with three, to the cams 12 complementary cams 14 provided by an imaginary cylindrical surface 15 gradually rise inwards and steeply fall to this again. The slopes of the cams 12 . 14 are opposite to each other and have a slope between about 1:20 and 1:50 in their shallow rise.

An envelope over the highest elevations of the cams 12 on the cone 7 has larger diameter than an envelope over the highest elevations of the cams 14 in the sleeve 10 , At the same time, the envelopes have a smaller diameter than the imaginary cylindrical surfaces 13 . 15 in the opposite component. This results in a 3 designated, narrow joint gap 16 between pin and sleeve, which allows to push the two parts into each other.

When turning the pin 7 clockwise this joint gap decreases until the cams 12 . 14 slide on each other and come in firm friction: 4 , Joint gap and pitch of the cams are coordinated so that the frictional engagement occurs after rotation of the pin by only about 15 °.

This frictional connection connects the extension 4 for the use of the billiards 1 occurring rotational and shear forces firmly together. The frictional engagement can be easily solved by turning back the extension and the joint gap can be restored so that it can be removed again from the lower part.

For fixing in the lower part 3 or in the extension 4 is the pin 7 opposite bolts 8th and the sleeve 10 on their respective outer surfaces with a surface texture 17 provided by means of which these parts are fastened in their recordings. This surface structure may consist of a thread that fits into the respective parts of the billiard bar 1 can be screwed. Alternatively, the surface structure may also consist of a cross corrugation, circumferential grooves or harpoon circumferential grooves, as is not shown in more detail.

The load on the connection is low and pressure is applied through the discs 9 . 11 and recorded and transmitted. So pin part 5 and / or hole part 6 If too strong turning for coupling or loosening of the parts are not released from their anchorage, the surface structure on pins 7 or on sleeve 10 as not shown in detail also consist of axially parallel grooves.

bolt 8th and sleeve 10 be beneficial in their shots 3 respectively. 4 screwed or pressed. In this case, the connection can be secured by introducing adhesive in addition and also in case of fading of the wood of the recordings.

If the billiard bar for easier accommodation during transport in separable Upper part and lower part is divided, a shaft / hub connection described can be arranged with advantage between the upper part and lower part.

1

billiard bar

2

top

3

lower part

4

renewal

5

Waves- or pin part

6

hub or bore part

7

Pin of the pin part 5

8th

Pin of the pin part 5

9

disc at the shaft or pin part

10

shell of the hub or bore part

11

disc at the hub or bore part

12

cam on the cone

13

Thought cylindrical surface of the cams 12

14

cam in the sleeve

15

Thought cylindrical surface of the cams 14

16

joining gap

17

surface structure

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 4231573 [0004]
• - GB 2226251 [0005]
• - GB 2246302 [0007]
• - DE 4209153 C2 [0012]

Claims (8)

Multi-part dismountable billiard bar with a device for connecting the parts of the billiard bar, characterized in that between at least two of the several parts ( 2 . 3 . 4 ) of the pool bar ( 1 ) a coupling member ( 5 . 6 ) in the form of a shaft / hub connection with deviating from the pure circular shape peripheral surfaces on the shaft part ( 5 ) and at the hub part ( 6 ) is arranged. Billiard stick according to claim 1, characterized in that the peripheral surface of the pin ( 7 ) at the shaft part ( 5 ) of an imaginary cylindrical surface ( 13 ) gradually rising and steeply back to its imaginary cylindrical surface falling cam ( 12 ) and the inner surface in the hub part ( 6 ) to the cams of the pin complementary cam ( 14 ), of an imaginary cylindrical surface ( 15 ) gradually increase inwards and fall steeply back to their imaginary cylindrical surface. Billiard stick according to claim 2, characterized in that pins ( 7 ) and sleeve ( 10 ) each three cams offset by 120 ° around the circumference ( 12 . 14 ) exhibit. Billard rod according to claim 2, characterized in that the flat pitch of the cams ( 12 . 14 ) is about 1:20 to 1:50. Billard rod according to claim 2, characterized in that the shaft / hub connection in the starting position a joint gap ( 16 ), through which the parts can be inserted into each other. Billard rod according to one of the preceding claims, characterized in that the bolt ( 8th ) of the shaft part ( 5 ) and the sleeve ( 10 ) of the hub part ( 6 ) on their outer surfaces with a surface structure ( 17 ) are provided by means of which they in the receiving parts ( 2 . 3 . 4 ) are fastened. Billiard stick according to one of the preceding claims, characterized in that the coupling member ( 5 . 6 ) between the lower part ( 3 ) and an extension part ( 4 ) of the pool bar ( 1 ) is arranged. Billiard stick according to claim 7, characterized in that a coupling member ( 5 . 6 ) also between the upper part ( 2 ) and the lower part ( 3 ) of the pool bar ( 1 ) is arranged.