EP2813705A1 - Air pump device for a bicycle tyre - Google Patents

Abstract

An air pump for a bicycle tire, comprising a pump head (1) with connection means for connection to the valve of the bicycle tire, a pump body (2) with a cylinder (10) and a piston (8), the piston (8) in the cylinder (8). 10) in a first and in the opposite second axial direction (11, 12) is movable so that both upon movement of the piston (8) in the first direction (11), as well as upon movement of the piston (8) in the second direction (12) is supplied to the pump head (1) air for inflating the bicycle tire, further comprising handle means with a handle (3), at least partially in a direction different from the axial direction (1 1, 12) third direction (31 ) and projects beyond the cylinder (10) in this direction (31). Alternatively or additionally, the air pump may comprise a flexible hose (4) connecting the pump head (1) to the pump body (2).

Description

The present invention relates to an air pump for a bicycle tire according to the preamble of claim 1.

The air pump of the aforementioned type is from the DE 103 42 957 B3 known. The air pump described therein comprises a cylinder with a piston movable therein, wherein air is pumped into the two-wheeled tire both when the pump is pulled apart and when the pump is compressed. Such pumps are also called duplex pumps or double-action pumps. The known from this state of the art air pump uses as a handle, the outside of the cylinder. The provided with connection means for a bicycle valve pump head of this air pump is arranged on a housing part which is fixedly connected to the piston rod.

A disadvantage of such a design, it proves that the serving as a handle outside of the cylinder when pulling the pump offers the user little grip. Furthermore, the rigidly connected to the piston rod connecting means of the pump head are exposed to the respectively associated with considerable effort pushing and pulling movements strong forces constantly changing direction. This can lead to damage to the bicycle valves, especially the fragile racing bike or Presta valves.

The problem underlying the present invention is the provision of an air pump of the type mentioned, which is easier to handle and / or less prone to damage.

This is inventively by an air pump of the type mentioned above with the characterizing features of claim 1 and / or claim 2. The subclaims relate to preferred embodiments of the invention.

According to claim 1 it is provided that the gripping means comprise a handle which extends at least partially in a deviating from the axial direction of the third direction and projects beyond the cylinder in this direction. For example, the handle may be an elongated handle whose longitudinal direction is parallel to the third direction. It can be provided that the third direction with the axial direction of the cylinder forms an angle between 30 ° and 150 °, preferably an angle between 50 ° and 130 °, in particular an angle between 70 ° and 110 °. Furthermore, it can be provided that the handle protrudes beyond the cylinder in the third direction at least on one side by a distance which is greater than the diameter of the cylinder, preferably greater than a multiple of the diameter of the cylinder.

The handle thus extends, for example, at the end of the cylinder or the pump body in the transverse direction, so that the user is a T-shaped or approximately T-shaped handle available. Through such a handle, both during a pressing movement, as well as during a pulling movement optimally force can be transmitted from the user to the cylinder or the piston.

According to claim 2 it is provided that the air pump comprises a hose, in particular a flexible hose, which connects the pump head to the pump body. In this way, the connecting means carrying the pump head is not rigidly connected to the piston or a piston rod holding the piston or not rigidly connected to the cylinder, so that on the Bike valves neither powerful forces during pushing movements nor pulling movements. In this way, the bicycle valves are largely protected from damage.

There is a possibility that the handle is detachably connected to the pump body. Specifically, in this case, the handle may extend in the axial direction of the cylinder in a first position corresponding to a non-operating position and in the third direction in a second position corresponding to an operating position. For example, the handle may be hollow and in the first position at least partially pushed onto the cylinder or the pump body. Furthermore, the handle may be mounted in the second position on the side facing away from the pump head end of the cylinder or at the end remote from the pump head end of the pump body.

In this way results in a very compact, visually appealing non-operating position and a very functional operating position, which allows optimal power transfer to the cylinder or the piston.

There is also the possibility that the hose and / or the pump head are arranged in a first position, which corresponds to a non-operating position, at least partially inside the pump body, and that the hose and / or the pump head in a second position, the corresponds to an operating position, at least partially protrude from the interior of the pump body. In this case, the hose during operation of the air pump or in the second position of the pump head represent the only connection between the pump body and the pump head.

This design has a very compact, visually appealing non-operating position of the air pump result, whereas the danger of damage to the bicycle valves is minimized by the particular exclusive connection of the pump body with the pump head via the flexible hose.

Fig. 1

eine perspektivische Ansicht einer erfindungsgemäßen Luftpumpe in einer Nicht-Betriebsstellung;

Fig. 2

eine perspektivische Ansicht der Luftpumpe gemäß Fig. 1 mit abgezogenem Griffstück;

Fig. 3

eine perspektivische Ansicht der Luftpumpe gemäß Fig. 1 mit abgezogenem und gekipptem Griffstück;

Fig. 4

eine perspektivische Ansicht der Luftpumpe gemäß Fig. 1 mit auf das Ende des Pumpenkörpers aufgebrachtem Griffstück;

Fig. 5

eine perspektivische Ansicht der Luftpumpe gemäß Fig. 1 mit auf das Ende des Pumpenkörpers aufgebrachtem Griffstück und herausgezogenem Pumpenkopf;

Fig. 6

eine perspektivische Ansicht der Luftpumpe gemäß Fig. 1 in einer Betriebsstellung, bei der der Kolben teilweise aus dem Zylinder heraus bewegt ist;

Fig. 7

einen Längsschnitt durch die Luftpumpe gemäß Fig. 1 in der auch aus Fig. 1 ersichtlichen Nicht-Betriebsstellung;

Fig. 8

einen Längsschnitt durch die Luftpumpe gemäß Fig. 1 in der auch aus Fig. 6 ersichtlichen Betriebsstellung;

Fig. 9

ein Detail gemäß dem Pfeil IX in Fig. 8;

Fig. 10

ein Detail gemäß dem Pfeil X in Fig. 8.

Further features and advantages of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. Show in it

Fig. 1

a perspective view of an air pump according to the invention in a non-operating position;

Fig. 2

a perspective view of the air pump according to Fig. 1 with removed handle;

Fig. 3

a perspective view of the air pump according to Fig. 1 with withdrawn and tilted handle;

Fig. 4

a perspective view of the air pump according to Fig. 1 with applied to the end of the pump body handle;

Fig. 5

a perspective view of the air pump according to Fig. 1 with the grip applied to the end of the pump body and the pump head withdrawn;

Fig. 6

a perspective view of the air pump according to Fig. 1 in an operating position in which the piston is partially moved out of the cylinder;

Fig. 7

a longitudinal section through the air pump according to Fig. 1 in the synonymous Fig. 1 apparent non-operational status;

Fig. 8

a longitudinal section through the air pump according to Fig. 1 in the synonymous Fig. 6 apparent operating position;

Fig. 9

a detail according to the arrow IX in Fig. 8 ;

Fig. 10

a detail according to the arrow X in Fig. 8 ,

In the figures, identical and functionally identical parts are provided with the same reference numerals.

From the longitudinal sections according to FIGS. 7 and 8 an embodiment of an air pump according to the invention can be seen. The illustrated air pump comprises a pump head 1, a pump body 2 and a handle 3. In this case, the pump head 1 via a, in particular flexible, hose 4 is connected to the pump body 2, wherein required by the hose 4 for the inflation of a two-wheel tire of the Pump body 2 can flow to the pump head 1.

The pump head 1 comprises connection means 5, 6 for the connection of the air pump with a non-illustrated valve of a bicycle tire. In this case, different connection means 5, 6 are arranged on opposite sides of the pump head 1 (see Fig. 7 ), which allow a connection of different valve types.

The pump body 2 comprises a first housing part 7, a hollow piston rod 8 with a piston 9 attached to the end and a cylinder 10 in which the piston 9 can be moved in a first axial direction 11 and a second axial direction 12. In this case, the first direction 11 corresponds to a compression of the air pump and the second direction 12 to a pulling apart of the air pump.

At the pump body side end of the hose 4, a connecting piece 13 is provided, which projects into the interior of the piston rod 8 (see Fig. 9 ). The connecting piece 13 is provided on the side facing away from the tube 4 with an opening 14 through the air from the piston rod 8 in the connector 13 and can enter from this into the tube 4.

The tube 4 is in the in Fig. 7 shown non-operating position inserted into the piston rod 8. Furthermore, in this position, the pump head 1 projects into a recess 15 on the end of the first housing part 7 facing the pump head 1. In this non-operating position, the pump head 1 may be surrounded by a dust cap 16.

The first housing part 7 has a tubular part 17 and a recess 15 enclosing the end piece 18 (see Fig. 9 ). At the end piece 18 and the dust cap 16 may be attached. The tubular part 17 may be part of the handle means. In particular, the user can grip the tubular part 17 with one hand.

The piston rod 8 is connected to the end piece 18 of the first housing part 7 and projects to the right in Fig. 8 or on the side facing away from the pump head 1 side of the tubular part 17 out and into the cylinder 10 inside. The arranged at the end of the piston rod 8 piston 9 has at its outer periphery a circumferential groove 19, from which an O-ring 20 is received. From the circumferential groove 19 go out of air channels 21, which ultimately open into the piston rod 8 (see Fig. 10 ).

At the two axial ends of the cylinder 10 is in each case a check valve 22, 23 is arranged, through which during the movement of the piston 9 air can enter into the cylinder 10. The first, the pump head 1 facing check valve 22 communicates with the outer space by a piston rod eighth surrounding gap 24 of the cylinder 10, which can be sealed by an O-ring 25. The second, the handle 3 facing check valve 23 communicates with the outer space through an end disposed in the cylinder opening 26 (see also Fig. 2 ).

In this case occurs in a movement of the piston 9 to the right in Fig. 10 or in the second axial direction 12 air through the first check valve 22 in a first compression space 27, the in Fig. 10 is arranged to the left of the piston 9. Furthermore occurs in a movement of the piston 9 to the left in Fig. 10 or in the first axial direction 11 air through the second check valve 23 in a second compression space 28, the in Fig. 10 is arranged to the right of the piston 9.

At the same time with a movement of the piston 9 to the left in Fig. 10 or in the first axial direction 11 of the O-ring 20 is pressed to the right (see the current state in Fig. 10 ), so that the circumferential groove 19 is fluidically connected to the first compression chamber 27. As a result, upon movement of the piston 9 to the left in Fig. 10 or in the first axial direction 11 in the first compression chamber 27 located air through the groove 19 and the air channels 21 in the piston rod 8 and pushed by this through the hose 4 to the pump head 1, from which the air can enter the two-wheeler.

Furthermore, with a movement of the piston 9 to the right in Fig. 10 or in the second axial direction 12, the O-ring 20 is pressed to the left (in Fig. 10 not imaged state), so that the circumferential groove 19 is fluidly connected to the second compression chamber 28. As a result, upon movement of the piston 9 to the right in Fig. 10 or in the second axial direction 12 located in the second compression space 28 Air is forced through the groove 19 and the air channels 21 in the piston rod 8 and from there through the hose 4 to the pump head 1, from which the air can enter the two-wheel tire.

In this way it is achieved that takes place both during a movement of the piston 9 in the first axial direction 11 or when squeezing the air pump, as well as during a movement of the piston 9 in the second axial direction 12 or during the pulling apart of the air pump compression , so that the pump head 1 air is supplied.

At the end facing away from the pump head 1 end of the cylinder 10, a guide 29 is arranged on this, on the one end of the handle 3 arranged groove 30 can be pushed (see also Fig. 2 ). In this case, the guide 29 has an inclination to the axial directions 11, 12, which is not equal to 90 °.

The handle 3 is designed as a unilaterally open, hollow or sleeve-like elongate member, which accordingly has a longitudinal direction. Due to the inclination of the guide 29, the longitudinal direction of the handle 3 in the operating position is parallel to a third direction 31 which encloses an angle α with the axial directions 11, 12, which is approximately equal to 105 °, for example in the illustrated embodiment (see Fig. 8 ). At the side remote from the groove 30 side of the handle 3, a bottom 34 is arranged (see Fig. 2 . FIGS. 7 and 8 ).

In the in Fig. 1 and Fig. 7 shown non-operating position, the handle 3 is pushed coaxially on the side facing away from the pump head 1 end of the cylinder 10, wherein it abuts the end of a arranged on the circumference of the cylinder 10 stop 32. In this case, the stop 32 on a nose-shaped extension 33 which engages in the groove 30 (see also Fig. 2 ).

Fig. 1 and Fig. 7 continue to show that the air pump is pushed together in the non-operating position so that on the left side of the stop 32, the tubular part 17 of the first housing part 7 and on the right side of the stop 32, the handle 3 is applied. Furthermore, the pump head 1 is partially in the recess 15 of the first housing part 7 and is surrounded by the dust cap 16. The hose 4 is completely received in the piston rod 8. The air pump is closed on the side facing away from the pump head 1 side of the bottom 34 of the handle 3 (see Fig. 7 ).

The Fig. 2 to Fig. 4 illustrate the removal of the handle 3 of the cylinder 10 and the pushing of the handle 3 at the angle α to the axial direction 11, 12 on the leadership of the cylinder 10. Die in Fig. 4 shown position shows that the handle 3 protrudes in the third direction 31 of the cylinder 10 and thus forms a handle, which makes in particular the pulling apart of the air pump easier.

The Fig. 5 and Fig. 6 illustrate the extraction of the tube 4 and the pump head 1 from the pump body 2 and the pulling apart of the air pump to push air out of the pump head 1.

Claims (11)

Air pump for a two-wheeled tire, comprising a pump head (1) having connection means for connecting the air pump to the valve of the bicycle tire, - a pump body (2) comprising a cylinder (10) and a piston (8), the piston (8) at least partially in the cylinder (10) and relative to the cylinder (10) in a first axial direction (11 ) and in the opposite second axial direction (12) is movable, and wherein the air pump is designed such that both upon relative movement of the piston (8) in the first direction (11), as well as relative movement of the piston (8) in the second direction (12) is supplied to the pump head (1) air for inflating the bicycle tire, - Handle means, by the movement of the relative movement of the piston (8) and cylinder (10) can be effected characterized in that the gripping means comprise a grip (3) which extends at least partially in a third direction (31) deviating from the axial direction (1 1, 12) and projects beyond the cylinder (10) in this direction (31). Air pump according to claim 1 or according to the preamble of claim 1, characterized in that the air pump comprises a hose (4), in particular a flexible hose (4), which connects the pump head (1) with the pump body (2). Air pump according to one of claims 1 or 2, characterized in that the third direction (31) with the axial direction (11, 12) of the cylinder (10) an angle between 30 ° and 150 °, preferably an angle between 50 ° and 130 °, in particular an angle between 70 ° and 110 °. An air pump according to any one of claims 1 to 3, characterized in that the handle (3) is an elongated handle (3) whose longitudinal direction is parallel to the third direction (31). Air pump according to one of claims 1 to 4, characterized in that , the handle (3) projects beyond the cylinder (10) in the third direction (31) at least on one side by a distance which is greater than the diameter of the cylinder (10), is preferably greater than a multiple of the diameter of the cylinder (10). Air pump according to one of claims 1 to 5, characterized in that the handle (3) is releasably connected to the pump body (2). An air pump according to any one of claims 1 to 6, characterized in that the handle (3) extends in a first position corresponding to a non-operating position in the axial direction (1 1, 12) of the cylinder (10), and in that the handle (3) in a second position, which corresponds to an operating position, extending in the third direction (31). Air pump according to claim 7, characterized in that the handle (3) is hollow and in the first position at least partially pushed onto the cylinder (10) or the pump body (2). Air pump according to one of claims 7 or 8, characterized in that the handle (3) in the second position on the pump head (1) facing away from the end of the cylinder (10) or at the pump head (1) facing away from the end of the pump body (2 ) is attached. Air pump according to one of claims 2 to 9, characterized in that the hose (4) and / or the pump head (1) are arranged in a first position, which corresponds to a non-operating position, at least partially in the interior of the pump body (2), and that the hose (4) and / or the pump head (1) in a second position, which corresponds to an operating position, at least partially protrude from the interior of the pump body (2). Air pump according to one of claims 2 to 10, characterized in that the hose (4) during operation of the air pump or in the second position of the pump head (1) is the only connection between the pump body (2) and the pump head (1).

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