WO1999037130A2

WO1999037130A2 - Pump head

Info

Publication number: WO1999037130A2
Application number: PCT/IB1999/000656
Authority: WO
Inventors: Stefan Feldmann
Original assignee: Sks-Metaplast Scheffer-Klute Gmbh
Priority date: 1999-03-25
Filing date: 1999-04-14
Publication date: 1999-07-29
Also published as: WO1999037130A3; DE29905501U1; AU3047499A

Abstract

The invention relates to a pump head (1) for connecting an air pump or a pressurised air line or similar to the valve of a tyre, comprising a cylindrical receiving bore (35) for receiving the head part of the tyre valve, a moveable pressure pin (20) being located at the base of said bore. The receiving bore (35) is at least partially configured as a clamping sleeve (5) with a pressure surface (38). The inventive pump head also comprises a lever (10). Moving said lever enables the axial compression of the clamping sleeve (5), by means of a transmission member (8, 6). The pump head (1) is therefore provided with transmission means (27, 28, 35, 36, 37, 21, 26) and the clamping sleeve (5) and pressure pin (21) can be moved or compressed by the lever (10) by means of said transmission means (27, 28, 35, 36, 37, 21, 26). A Schrader valve (24) can be clamped tight in the pump head when the lever is in a first position (a) and a Sclaverand valve (30) or a Dunlop valve (31) can be clamped tight in the pump head when the lever is in a second position (b).

Description

"umpenkopf"

The present invention relates to a pump head for connecting an air pump or an air pressure hose or the like to a tire valve according to the preamble of protection claim 1.

A pump head is known from US Pat. No. 5,819,781 which can compress a rubber grommet with the aid of a clamping lever which acts on a transmission means. The rubber grommet has a stepped bore, whereby a spring-loaded mandrel protrudes into the bore with the smallest diameter. The pump head is suitable for use with a Sclaverand valve and a Schrader valve. When used with a Schrader valve, the ventilation pin remains in its spring-loaded rest position; when using a Sclaverand valve, it is pressed against the spring. A disadvantage of the solution presented there is that the pump head cannot be used together with a Dunlop valve.

The present invention is based on the problem of creating a pump head which can be used in conjunction with a Sclaverand, Schrader or Dunlop valve with simple operation.

This problem is solved by a pump head according to protection claim 1. According to the invention it is provided that the pump head comprises a transmission means and that the clamping sleeve and the pressure pin can be moved or compressed by moving the lever over the transmission means such that a Schrader valve in a first position and a Sclaverand in a second position -Valve or a Dunlop valve is stuck in the pump head (1) can be. The pump head according to the invention also has the advantage that the operation is the same for all three valves. The pump head can be plugged into a rest position of the lever and is clamped with the same lever movement regardless of the type of valve. The lever end position at which the valve is clamped differs depending on the valve.

It is particularly advantageous if the adjustment range of the lever is approximately 90 °. Since bicycle valves usually protrude between the spokes of the wheel, it is advantageous to enable the pump head to be operated from one side of the wheel. With an adjustment range of the lever of approximately 90 °, it is therefore not necessary to reach around from one side of the wheel to the other, which is difficult anyway in the case of a loaded lever, since this has to be released.

In a preferred embodiment it is provided that the pressure pin can be displaced relative to the pressure surface by the transmission means when the lever is actuated. The

The position of the pressure pin must be different depending on the valve used. Compared to inserting the pressure pin against spring force, as is customary in the prior art, the solution according to the invention offers the advantage that an additional spring force to be overcome is not required when the bicycle valve is inserted into the pump head. Furthermore, the solution according to the invention is more reliable, since springs usually lose their spring force after prolonged use, or the pressure pin cannot be returned to its rest position due to a lack of sufficient spring force due to contamination of its bearing.

In the preferred embodiment it is provided that the pressure pin is arranged on an actuating cam, the actuating cam having a link on the side facing the lever in the installed position. The advantage of this solution is that the actuating cam can be designed with a relatively large diameter, so that it is easy to seal.

In the preferred embodiment it is further provided that the pump head comprises a pressure cylinder which comprises a cylinder ring in which the actuating cam is axially displaceably mounted, the clamping sleeve being able to be compressed by axially displacing the pressure cylinder. This embodiment offers the advantage that the largely rotational symmetry of the components used enables a uniform load distribution to be achieved which avoids warping or jamming of the components.

In the preferred embodiment it is further provided that the pressure cylinder has a groove in its side facing the lever in the installed position. The groove allows access to the actuation cam.

In the preferred embodiment it is further provided that the pressure cylinder has at least one bearing surface facing the lever in the installed position. The support surface is used to transmit the force exerted by the lever to the clamping grommet.

It is advantageous if the pump head has a bearing cylinder, which essentially encloses the clamping sleeve on its cylinder jacket surface with a positive fit. Depending on the material used for the rubber grommet, the pressure forces are relatively large. The solution proposed here has the advantage that the pressure load on the housing surrounding the rubber grommet remains low.

It is advantageous if the storage cylinder has a crossbar which is arranged in the installed position on the side facing the lever. The traverse enables the actuation cam and the

Printing cylinder. It is furthermore advantageous if a ring is arranged on the traverse. The pressure pin can thus protrude through the crossbar, even if this through the Central axis of the storage cylinder runs.

In a preferred embodiment it is further provided that the cylinder ring of the printing cylinder has a cutout, the dimension of

Storage cylinder and cylinder ring are dimensioned so that the cylinder ring can be inserted into the side of the storage cylinder with the crossbeam and ring. This solution offers the advantage that the printing cylinder is guided precisely and tilting is therefore avoided.

It is particularly advantageous if the lever has at least one second cam which engages with the link of the actuating cam. The adjustment path of the actuating cam depending on the position angle of the lever can be changed relatively easily by adapting the second cam.

In a preferred embodiment it is provided that the actuating cam is rotationally symmetrical. In this way, turning the actuating cam in its bearing has no influence on the functionality of the pump head.

In a further embodiment it can be provided that compressed air is introduced directly into the pressure cylinder and that the grommet, pressure cylinder and actuating cam are gas-tight to the environment on their contact or sliding surfaces. The guidance of the compressed air within the pump head can be simplified in this way.

The present invention is described in more detail below on the basis of exemplary embodiments with reference to the accompanying drawings. Show

Figure 1 is an exploded view of the pump head according to the invention.

2 shows a longitudinal section through a pump head with the lever position open;

3 shows a longitudinal section through a pump head in the pump position for a Schrader valve;

4 shows a longitudinal section through a pump head in the pump position for a Sclaverand valve;

5 shows a longitudinal section through a pump head in the pump position for a Dunlop valve;

6 shows a spatial representation of a clamping lever;

7 is an exploded view of a second embodiment of a pump head according to the invention;

Fig. 8 is an exploded view of a third embodiment of a pump head according to the invention.

First, reference is made to FIG. 1. A pump head 1 comprises a pump head housing 2, which has a hose extension 3, into which a threaded bore 14 is made. The hose attachment 3 corresponds to a tube attachment in a hand pump. The pump head housing 2 also has a stepped bore 4. In the stepped bore 4, a clamping grommet 5 is attached, which has a pressure surface 38. An annular disc 6 rests on the pressing surface 38. Clamp grommets 5 and annular disc 6 comprises a storage cylinder 7. The outer diameter of the bearing cylinder 7 corresponds to the inner diameter of the stepped bore 4, the inner diameter of the bearing cylinder 7 corresponds approximately to the outer diameter of the clamping sleeve 5 and the ring disk 6. The bearing cylinder 7 has a cross member 15 which in the area of the central axis of the bearing cylinder 7 into a ring 16 transforms. The outside diameter of the ring 16 corresponds approximately to the inside diameter of the ring disk 6. The inside diameter of the ring 16 corresponds approximately to the inside diameter of the clamping sleeve 5. A pressure cylinder 8 has a cylinder ring 17 in which two groove-like cutouts 18 are arranged. Cylinder ring 17 and cutout 18 are designed so that the pressure cylinder 8 can engage in the storage cylinder 7, the cross member 15 and the ring 16 being encompassed by the cylinder ring 17. On its upper side, the pressure cylinder 8 has a groove 19 which is arranged approximately perpendicular to the groove formed by the two cutouts 18. The inner bore of the cylinder ring 17 is continued as a blind hole and is broken through the groove 19. An actuating cam 9 is arranged in the blind hole. This has a pressure pin 20 on its underside, and a link 21 on the top. In the installed position of the actuating cam 9, the link 21 lies within the groove 19 and projects beyond it

Top of the pressure cylinder 8. A seal 22 seals the actuating cam 9 from the pressure cylinder 8. The pressure cylinder 8 forms with the washer 6 a transmission member, which enables the transmission of a force from the top of the pressure cylinder 8 to the grommet 5. A lever 10 is fastened to the pump housing 2 by means of holders 11 and a pin. The lever 10 has in its outer region two first cams 27, which are brought into engagement with the contact surfaces 26 of the pressure cylinder 8, and a second cam 28, which is to be brought into engagement with the link 21 of the actuating cam 9. The stepped bore 4 is guided through the housing in the form of a receiving opening 4a according to FIG. 2. The The diameter of the receiving opening is slightly larger than the diameter of the grommet 5 in the unloaded state. The receiving opening 4a and the through bore 23 together form a receiving bore 35. The inside width D of the receiving bore 35 can be changed by actuating the lever 10.

Fig. 2 shows a longitudinal section through the pump head 1. The lever 10 is in the "open" position, the rubber grommet 5 is relieved, the actuating cam 9 is movable within the pressure cylinder 8. A pressure hose of a pump can be connected to the threaded bore 14. By moving the lever 10 in the direction of the arrow 23, the pressure cylinder 8 and the actuating cam 9 are moved. 3, 4 and 5, the function of the pump head 1 is explained and its use in connection with a Schrader valve, a Sclaverand valve and a Dunlop valve. By moving the pressure cylinder 8, the clamping sleeve 5 is axially compressed by means of the cylinder ring 17 and the washer 6. The grommet 5 is made of rubber-elastic material and rests in the rest position both on the cylinder circumference and on both end faces of the components surrounding it. The axial compression of the grommet 5 therefore causes the through bore 23 of the grommet 5 to narrow.

FIG. 3 illustrates the use of the pump head 1 according to the invention in connection with a Schrader valve 24. To fill the Schrader valve 24, a valve pin 25 must be pressed down. The Schrader valve 24 is at one

The position of the lever 10 according to FIG. 2 is inserted into the through bore 23 through the bore in the pump housing 2 facing away from the lever 10 and belonging to the stepped bore 4. The ring 16 serves as a stop, since its inside diameter is smaller than the outside diameter of a Schrader valve. The

Lever 10 is brought into the position according to FIG. 3 according to arrow 23 in FIG. 2. First, the pressure cylinder 8 is arranged by a cam on the lever 10, which points to a Support surface 26 presses, pushed in the direction of the grommet 5. The grommet 5 is thereby axially compressed, so that the diameter of the through hole 23 is reduced. The wall of the grommet 5 nestles against the outer housing of the Schrader valve 24 and fixes it. The second cam 28 presses the pressure pin 20 of the actuating cam 9 onto the valve pin 25 of the Schrader valve 24. The valve is thereby opened so that the compressed air flowing through a pressure hose attached to the threaded bore 14 can flow through the Schrader valve 24.

FIG. 4 shows the use of the pump head 1 in connection with a Sclaverand valve 29. The Sclaverand valve 29 is to be inserted into the through bore 23 of the clamping sleeve 5 when the lever 10 is shown in FIG. 2 or in FIG. 3. By moving the lever 10 in the direction of arrow 23 according to FIG. 2, this is brought into the position according to FIG. 4. The second cam 28 engages when the position of the lever 10 according to FIG. 3 is exceeded in a recess in the link 21

Actuating cam 9 so that it is no longer pressed by the second cam 28 in the direction of the Sclaverand valve 29. The Sclaverand valve 29 is to be inserted as far as possible into the through bore 23 of the clamping nozzle 5. The Sclaverand valve 29 is arranged in a valve extension 30 which is fixedly connected to a tire tube. The Sclaverand valve 29 is now pushed so far into the through hole 23 that the inside of the clamping sleeve 5 can be brought into engagement with the valve shoulder 30. By pushing the Sclaverand valve 29 as far as possible into the through bore 23, the valve head of the Sclaverand valve 29 is pressed against the pressure pin 20 of the actuating cam 9 and the valve is thus opened. At the same time, the grommet 5 seals on the smooth cylindrical part of the Sclaverand valve.

Fig. 5 shows the use of the pump head 1 according to the invention in connection with a Dunlop valve 31. The position of the The lever 10 corresponds to the position shown in FIG. 4 in the case of a Sclaverand valve 29. This has a valve nipple 33 which is screwed onto a valve stem by means of a union nut 32. The Dunlop valve 31 is inserted so far into the through hole 23 of the clamping sleeve 5 that the union nut 32 abuts the pump housing 2. By moving the lever 10 into the vertical position according to FIG. 4 or FIG. 5, the clamping sleeve 5 is pressed in so far that it lies firmly against the valve nipple 33. An additional valve actuation is not necessary with the Dunlop valve 31, since this opens automatically when there is excess pressure.

Fig. 6 shows the lever 10 in a spatial representation. The first cam 27 is approximately semicircular and has a number of approximately tangentially flattened areas. A first latching surface 35 is arranged on the first cam 27 in such a way that it lies flat on the support surface 26 in the position according to FIG. 3. The lever 10 thus experiences a first latching position due to the counter pressure exerted when the clamping sleeve 5 is compressed. A second latching surface 36 is arranged on the lever 10 in such a way that in the position according to FIG. 4 or FIG. 5 it lies flat against the contact surface 26 of the printing cylinder 8 and a locking also takes place here. The distance between the first latching surface 35 and the second latching surface 36 from an axis of rotation 37, by means of which the lever 10 is fastened to the holders 11, is matched to the different stroke paths of the pressure cylinder 8 for fixing the different valve types. The second locking cam 28 is arranged between the two first locking cams 27. Location and length are matched to the shape of the backdrop 21. The first locking cam 27, the second locking cam 28, the first locking surface 35, the second locking surface 36, the axis of rotation 37, the link 21 and the support surface 26 form a transmission means comparable to a cam mechanism.

The previously illustrated embodiment of a pump head 1 is suitable both as a pump head, which is installed in a pressure hose, for example a floor pump, and as a pressure head, which is integrated in a hand-held air pump. The described embodiment is made with metal, apart from the clamping sleeve 5 and sealing elements, m metal. Likewise, an embodiment mainly made of plastic is conceivable; here the shape of the housing elements in particular has to be adapted to the requirements of the respective plastic manufacturing process, for example injection molding.

Fig. 7 shows the exploded view of a second embodiment of a pump head. The function basically follows the embodiment shown in FIGS. 1 to 6, but the pressure cylinder 8 is designed to be rotationally symmetrical, instead of a bearing cylinder 7 to be inserted from the side to which the lever 10 is attached, a bearing sleeve 71 that can be inserted from the opposite side is provided here. Apart from the pump head housing 2 with the flanged hose adapter 3 and the lever 10, all components used are rotationally symmetrical. The function corresponds to the representations of FIGS. 3 to 5.

Fig. 8 shows a third embodiment of the pump head, in which the hose attachment 3 is firmly connected to the pressure cylinder 8. The pump head housing 2 has an elongated cutout 39, in which a flange 40, with which the pressure cylinder 8 is connected to the hose attachment 3, can be moved m in the installation position axially to the central axis of the rotationally symmetrical components, the actuating cams 9 and the clamping sleeve 5. With this design, sealing of the movable assemblies with respect to the pump head housing 2 can be avoided.

Claims

Claims:

1. Pump head (1) for connecting an air pump or an air pressure hose or the like with a

Tire valve comprising a cylindrical receiving bore (35) for receiving the head part of the tire valve, wherein a movable pressure pin (20) is arranged on the bottom of the cylindrical receiving bore (35) and wherein the receiving bore (35) at least partially as a clamping grommet (5), which via a Pressure surface (38) has, is formed, and also comprises a lever (10), wherein by moving the lever (10), the clamping sleeve (5) can be axially compressed by means of a transmission member (8, 6), characterized in that the pump head (1) further comprises transmission means (27, 28, 35, 36, 37, 21, 26) and that the clamping grommet (5) and the pressure pin (21) by moving the lever (10) over the transmission means (27,

28, 35, 36, 37, 21, 26) can be moved or compressed so that in a first position (a) of the lever (10) a Schrader valve (24) and in a second position (b) a slavery -Valve (30) or a Dunlop valve (31) in the pump head (1) can be clamped.

2. Pump head according to claim 1, characterized in that the adjustment range of the lever (10) is approximately 90 °.

3. Pump head according to claim 1 or 2, characterized in that the pressure pin (20) by the transmission means (27, 28, 35, 36, 37, 21, 26) when actuating the lever (10) relative to the pressure surface (38) is.

4. Pump head according to one of claims 1 to 3, characterized in that the pressure pin (20) on one The actuating cam (9) is arranged, the actuating cam (9) having a link (21) encompassed by the transmission means on the side facing the lever (10) in the installed position.

5. Pump head (1) according to one of claims 1 to 4, characterized in that it comprises a pressure cylinder (8) which comprises a cylinder ring (17) in which the actuating cam (9) is axially displaceably mounted, and wherein the clamping sleeve (5) by axial

Moving the pressure cylinder (8) can be compressed.

6. Pump head (1) according to one of claims 1 to 5, characterized in that the pressure cylinder (8) on its in

Installation position has a groove (19) on the side facing the lever (10).

7. Pump head (1) according to one of claims 1 to 6, characterized in that the pressure cylinder (8) has at least one in the installed position facing the lever (10) by the transmission means covered bearing surface (26).

8. Pump head (1) according to one of claims 1 to 7, characterized in that it has a storage cylinder (7) which essentially encloses the clamping sleeve (5) on its cylindrical surface in a form-fitting manner.

9. Pump head (1) according to claim 8, characterized in that the storage cylinder (7) has a cross member (15) which is arranged in the installed position on the lever (10) facing side.

10. Pump head (1) according to claim 9, characterized in that a ring (16) is arranged on the crossmember (15).

11. Pump head (1) according to claim 10, characterized in that that the cylinder ring (17) of the impression cylinder (8) has a cutout (18), the dimensions of the storage cylinder (7) and the cylinder ring (17) being such that the cylinder ring (17) on the cross member (15) and Ring (16) provided side of the storage cylinder

(7) can be inserted into this.

12. Pump head according to one of claims 1 to 11, characterized in that the lever (10) has at least one second cam (28) encompassed by the transmission means, which engages with the link (21) of the actuating cam (9).

13. Pump head according to one of claims 1 to 12, characterized in that the lever (10) has at least one first cam (27) encompassed by the transmission means, the first cam (27) having at least one latching surface (35, 36) has to be brought into engagement with at least one bearing surface (26) of the printing cylinder (8).

14. Pump head according to one of claims 1 to 13, characterized in that the actuating cam (9) is rotationally symmetrical.

15. Pump head according to one of claims 1 to 14, characterized in that compressed air is introduced directly into the pressure cylinder (8) (hose attachment 8) and that the grommet (5), pressure cylinder (8) and actuating cam (9) at their contact or

Sliding surfaces are gas-tight to the environment.