Manually actuated pump

The invention relates to a hand-operated pump for dispensing liquids, in particular washing lotions for cleaning the human body, with a movable between a rest position and operating position dispensing head and means for preventing the movement of the dispensing head, both at rest and in the operating position according to the preamble of claim 1. A hand-operated pump of this type is known from European Patent application 95 10 5385.9.

Such pumps are increasingly common in recent years, to make a large number of products, such as personal care products, cleaning products, lubricants, etc.,. A typical hand-operated pump consists of a pump housing having a pump cylinder for receiving a reciprocating piston slidably disposed in the pump cylinder. The pump is provided with a suction tube and can be fastened on a container for sucking contained in the container liquid. A pump shaft extending from the pump housing and is connected to the piston, a spring holds the piston and the pump shaft in the direction of the extended rest position of the pump shaft under prestress. The dispenser head is mounted on the pump shaft. A plurality of one-way valves disposed within the pump housing, so that the liquid can be dispensed into the container from the discharge port by reciprocating the dispensing head between the rest position and the operating or working position.

There is a locking device is provided with which the pump shaft is lockable to a discharge of the liquid out of the pump during their transport o.dergl. to prevent. Here, a lockout is possible both in the rest position and in the working position of the pump shaft. The sequence of steps for disabling the pump in the rest position is identical to the order of the steps for locking the pump into the working position. It requires only a rotation of the dispenser head by 90 ° in order to lock or unlock the pump. The locking device is arranged in the pump housing. Therefore, the manufacturer has the choice of the product to ship with the dispenser head either at rest or in the actuating position.

If pumps of this type known to be used in conjunction with so-called wash lotions under a shower, due to the required tank vent water or wash water between the dispenser head and the casing neck can penetrate into the pump housing and thus by the need for ventilation side hole in the container and with the Waschlotion therein mix. At best, this mixing results in a dilution of the active substances contained in the wash, in the worst case, in particular in cleansing lotions without preservative, to contamination or contamination of the cleanser.

Object of the invention is to improve a hand-operated pump of the type described above in such a way that the liquid or already existing in the pump cylinder residual liquid contained in the container are protected from contamination or other quality losses.

The invention solves this problem by the features contained in the claim. 1 The intersection of the uprising in the direction of the dispensing head, cylindrical housing neck by the above in the direction of the container, cylindrical sealing cap of the dispensing head in every operating position of the pump, particularly but already in the initial or rest position of the pump, it is ensured that the pump in each impairing operation state prior to the entry of the quality of the liquid contained in the container and, if applicable. is protected contaminating foreign bodies or liquids so that a hygienic use of the pump is ensured even under unfavorable conditions, ie that the pump also for the delivery of quality products, including medical Waschlotion o.dergl., under relatively unfavorable conditions, such as under a shower , suitable is.

The invention is described below with reference to schematic drawings of exemplary embodiments of the pump closer. There are:<dl id="dl0001" compact="compact"><dt>Fig. 1</dt><dd>is a central longitudinal section of a hand-operated pump, the overlap between the dispenser head and pump housing in the extended rest position of the dispensing head to see;</dd><dt>FIG. 2</dt><dd>a cross-section according to line 2-2 in Fig. 1;</dd><dt>Fig. 3</dt><dd>Similarly, a central longitudinal section of Fig 1, wherein the overlap between the dispenser head and the pump housing is shown in the retracted working or pumping position of the dispenser head.</dd><dt>Fig. 4</dt><dd>a cross-section according to line 4-4 in Fig. 3;</dd><dt>Fig. 5</dt><dd>an enlarged, partially broken-away central longitudinal section of the pump of Figure 1 to 4, wherein the pump piston is shown in the retracted working or pumping position.</dd><dt>Fig. 6</dt><dd>an enlarged, partially broken-away central longitudinal section of the pump of Figure 1 to 4, wherein the pump piston is moved back to the extended resting position.</dd><dt>Fig. 7</dt><dd>a partially broken away, isometric view of a portion of a sleeve shown in Figure 2 with a locking block and stops.</dd><dt>Fig. 8</dt><dd>a partially broken away isometric view of a portion of a pump shaft of Figure 2 with the locking cam.</dd><dt>Fig. 9</dt><dd>a cross-section according to line 9-9 in Fig. 1;</dd><dt>Fig. 10</dt><dd>a central longitudinal section according to line 10-10 in FIG 9, wherein the position of the locking cam is shown with respect to the locking block.</dd><dt>Fig. 11</dt><dd>a partially broken away isometric plan view of Figure 8 with the position of the first locking cam with respect to the locking block.</dd><dt>Fig. 12</dt><dd>a cross-section similar to Figure 9, wherein the pump shaft is locked in the extended position.</dd><dt>Fig. 13</dt><dd>a central longitudinal section along the line 13-13 in Figure 12 with the position of the locking cam in respect to the locking block.</dd><dt>Fig. 14</dt><dd>a partially broken away isometric plan view of Figure 12 with the position of the first locking cam with respect to the locking block.</dd><dt>Fig. 15</dt><dd>a cross-section similar to Figure 9, wherein the pump shaft is locked in the retracted working or pumping position.</dd><dt>Fig. 16</dt><dd>a central longitudinal section along the line 16-16 in Figure 15 with the position of the locking cam in respect to the locking block. and</dd><dt>Fig. 17</dt><dd>a partially broken away, bottom isometric view of FIG. 15 with the position of the locking cam in respect to the locking block.</dd></dl>

Similar numerals refer to similar parts in Figs. Of the drawings.

FIG. 1 is a central longitudinal section of a hand-operated pump 10 with a dispenser head 60 is located in an extended rest or initial position, with 61 a is referred to as splash protection provided, permanent overlap region between the dispensing head 60 and a pump case 30. Fig. 2 is a cross section along the line 2-2 in Fig. 1. Fig. 3 is a central longitudinal section similar to FIG. 1, the dispenser head 60 is located in the retracted working or pumping position, so that the overlap region 61 between the dispensing head is 60 and the pump housing 30 is increased accordingly. Fig. 4 is a cross section taken along the line 4-4 in Fig. 3.

The pump housing 30 has a first, outer casing end 31 and a second, inner housing end 32, with a pump cylinder 34 extending between the two ends of the housing 31, 32 with a pump cylinder wall 36th The pump housing 30 is provided with a radially outwardly extending flange 38, which forms a unit with the pump housing. A vent opening 39 extends through the pump cylinder wall 36 of the pump housing 30th

A closure 40 has a central opening 42, the first housing end 31 of the pump housing 30 through which extends therethrough. The closure 40 has internal threads 44 with which the closure 40 may be mounted on an external thread of a container finish in a conventional and therefore not shown manner. The first end of the housing 31 extends through the opening 42 of the shutter 40. When the pump casing 30 is fixed by means of the screw cap 40 to a container, the flange of the pump housing 30 located 38 on the edge of the container opening, so that the pump housing 30 with respect to the container is sealed. It is understood that instead of the screw fastening, any other known type of fastening of the closure is on the container in question.

A sleeve 70 is disposed within the pump cylinder 34 having a cylindrical inner wall 71st A cylindrical outer wall 72 of the sleeve 70 is provided with annular locking elements 74, which cooperate with ringnutförmigen detent elements 75 on the cylinder wall 36 of the pump housing 30 in the sense of a tight fixing of the sleeve 70 in the pump housing 30th An annular collar 76 is an integral part of the sleeve 70 and engages over the body first end 31 of the pump casing 30. The annular collar 76 also holds the fastener 40 between the flange 38 and the annular collar 76 in position. The connection of a plurality of axially spaced provided, toroidal or ringnutförmigen locking elements 74 and 75 of the sleeve 70 and the pump housing 30 is axially adjustable.

The sleeve 70 extends in Fig. 1 with a protruding from the pump housing 30, the cylindrical end 73 through the annular collar 76 out outward or upward in the direction of the dispensing head 60 as well as at a radial distance between the inner wall 71 of the sleeve 70 and the outer wall of a pump shaft 50 to form a cylindrical annular space or -spaltes 25th

The pump shaft 50 has a first shaft end 51 extending from the pump housing 30 out, and a second shaft end 52 that extends into the pump housing 30 into it. An axial passage 54 connects the two open shaft ends 51, 52 of the pump shaft 50. The first stem end 51 carries the dispensing head 60, which has an outlet opening 62, which communicates with the passage 54 of the pump shaft 50th The first stem end 51 engages in a provided with a through hole 64 to which the pump housing 30 facing bottom of the dispensing head 60 is preferably friction fit with a tubular connecting stub 63rd The passage opening 64 is connected with the outlet 62 through an outlet channel of the dispenser head 62A 60th

The tubular connecting stub 63 is at a radial distance to form a free intermediate cylindrical space 67 surrounded by a cylindrical sealing cap 65, which extends in the direction of the pump housing 30 coaxial with the pump shaft 50 via the lower end of the connecting piece 63 out downwards.

The inner diameter of this cap 66 of the dispenser head 60 is slightly larger than the outer diameter of the outer end 73 of the sleeve 70 so that the sealing cap 65 the outer end of the sleeve 73 not only in the initial or rest position of the pump shaft shown in Fig. 1, upper 50 and of the dispensing head 60, but in every stroke position of the same sealing and displaceable covering.

The cylindrical gap 67 between the connecting piece 66 and the sealing cap 65 of the dispenser head 60 is adapted to the cross-section of the outer end 73 of the sleeve 70 approximately corresponding to, such that the gap 67 forms an downwardly open guide channel 68 for the upper end of the sleeve 73 in the pump head 60 , The connecting piece 66 can engage in the pump stroke end position in an opening 69 of the outer end 73 of the sleeve 760th

As confirmed by experiments, no splashing from entering the annular space 25, by diluting the active ingredients of a cleanser and a contamination of the same could be caused. The seal between the dispensing head 60 and the sleeve 70 is naturally 60 exacerbated by pressing down the dispensing head in the exercise of a pump stroke.

The gap 67 between the connecting piece 66 and the sealing cap 65 of the dispenser head 60 is adapted to the cross-section of the outer end 73 of the sleeve 70 approximately corresponding to, such that the gap 67 a guide channel 68 in the pump head 60 forms and the connecting stub 66 in the region of Pumpenhub- end position can be engaged in an opening 69 of the outer end 73 of the sleeve 70th

A suction pipe 78 is attached by friction fit in a receiving opening 79 in the second, lower end of the housing 32 of the pump housing 30th The suction tube 78 provides the Flüssigkleitsverbindung between the liquid contained in the container and the pump cylinder 34 of the pump housing 30th

A first one-way valve 80 is disposed near the second housing end 32 of the pump housing 30 to permit the flow of liquid from the reservoir only into the pump cylinder 34 of the pump housing 30th The first one-way valve 80 comprises a valve seat 82, which is shown as a cylindrical valve seat and forms a unit with the pump housing 30, and a movable valve 84 for sealing the valve seat 82. The valve 84 is here designed as a ball valve.

A spring 90 presses under pretension, the valve 84 sealingly against the valve seat 82. The spring 90 is a coil spring having a first portion 91, a second portion 92 and an intermediate portion 93. The intermediate portion 93 of the coil spring 90 has opposite the second portion 92 of the coil spring 90 has a smaller diameter. The diameter of the second section 92 is sufficient to allow a linear movement of the valve 84 within the second section 92 of the spring 90th The diameter of the intermediate portion 93 of the spring 90 is sufficiently small, to detect the valve 84th The second portion 92 of the spring 90 maintains the valve 84 in the second portion 92 of the spring 90, while the intermediate portion 93 of the spring 90 biases the valve 84 sealingly against the valve seat 82nd The second shaft end 52 of the pump shaft 50 has a narrower end of the shaft 100, the 91 of the spring 90 for biasing the pump stem 50 receives the first portion in its rest position.

The passage channel 54 of the pump shaft 50 ends in the region of a plurality of input ports 101, 102, 103 to the passage 54, which are arranged in a shank recess 106 near the second stem end 52 of the pump shaft 50th The shank recess 106 having a diameter between 108D annular Schaftwulst 108 of the pump shaft 50 and a shaft shoulder 109 arranged. First and second shank valve seats 111 and 112 are provided in the pump shaft 50th The first stem valve seat 111 is formed by the shaft shoulder 109 of the pump shaft 50th The second drain valve seat 112 consists of the annular ring 108 of the pump shaft 50th

A piston 120 is slidably disposed within the pump cylinder 34 of the pump housing 30 and thus divides the pump cylinder 34 into two halves, namely a first, upper pump cylinder 34A and a second, lower pump cylinder 34B. The piston 120 has a substantially rigid, cylindrical portion 122 having a central opening 124. An annular shoulder of the piston 120 extends into the central opening 124 and has an inner diameter shoulder-126D. A first and second piston valve surface 128 and 129 are disposed on the piston 120 and each cooperate with the first and second shaft valve seats 111 and 112th The first piston valve surface 128 consists of an inner face of the substantially rigid piston member 122, while the second piston valve surface 129 is formed by the annular bead 108 of the piston 120th

First and second sealing jacket 131 and 132 form with the piston 120 is a unit by means of an annular piston carrier 134. The first and second seal coats 131, 132 are tapered to their ends 131A and 132A through which bear under friction against the pump cylinder wall 36 and a sliding seal form between the piston 120 and the inner cylinder wall 36 of the pump cylinder 34th

The outer diameter of the annular Schaftwulst diameter 108D of the Schaftwulstes 108 is slightly larger than the inner diameter of the annular shoulder diameter 126D of the piston-annular shoulder 126 of the piston 120. As a result, the Schaftwulst 108 may be inserted into the central opening 124 of the piston 120 under force and by the Kolbenwulst are moved. Thereby, the substantially rigid cylindrical part 122 of the piston 120 is deformed so far that the Schaftwulst 108 can be moved past the inner annular shoulder 126 of the piston 120th After the Schaftwulst 108 has been moved past the annular shoulder 126, the piston 120 is slidably retained within the shank recess 106 of the pump shaft 50th

A second one-way valve 140 includes the first and second valve seats 111 and shaft 112 of the pump shaft 50, which cooperate with the first and second piston valve surfaces 128 and 129 of the piston 120th The piston 120 is slidably mounted within the shank recess 106 of the pump shaft 50, so that the first and second shaft valve seats 111 and 112 of the pump shaft 50 can create respectively against the first and second piston valve faces 128 and 129 of the piston 120th When the piston 120 slides within the shank recess 106 of the pump shaft 50, the piston 120 may input ports 101-103 of the passage channel 54 either cover or expose to open the fluid connection to the passage 54 or close. The first piston valve surface 128 of piston 120 forms a sliding seal against the first valve seat shaft 111th

In the non-actuated position according to FIG. 1, the spring 90 biases the second shaft valve seat 112 of the pump shaft 50 to abut against the second piston valve surface 129 of the piston 120 to the flow of the liquid 12 from the second pump cylinder 34B in the shaft channel 54 of the pump shaft 50 to prevent. When the dispensing head 60 is moved by an operator towards the retracted pump position, the friction fit between the outer ends 131A, 132A of the first and second seal coats 131, 132 and the pump cylinder wall 36 immobilized initially the piston 120 with respect to the pump housing 30. When the pump shaft 50 moves relative to piston 120, the second shaft valve seat 112 of the pump shaft 50 is adjusted by the second piston valve surface 129 of the piston 120, so that the fluid between the second pump cylinder 34B and the shaft channel 54 of the pump shaft 50 can flow. A continuing movement of the pump shaft 50 with respect to the piston 120 causes the first shaft valve seat 111 of the pump shaft 50 slidably the first piston valve surface 128 of piston 120 seals to prevent the liquid 12 from the pump cylinder 34B in the first pump cylinder 34A flows.

When the dispenser head 60 is released by an operator moves the spring 90 the pump shaft 50 toward the extended position shown in FIG. 1. The friction fit between the outer ends 131A and 132A of the first and second seal coats 131 and 132 and the pump cylinder wall 36 immobilized initially in turn, the piston 120 with respect to the pump housing 30. When the pump shaft 50 is moved relative to the piston 120, seals the first shaft valve seat 111 of the pump shaft 50, the first piston valve surface 128 of the piston 120 displaced from, to avoid that the liquid between the second pump cylinder 34B and the shaft channel 54 of the pump shaft 50 passes. A continuing movement of the pump shaft 50 with respect to the piston 120 causes the second shaft valve seat 112 of the pump shaft 50 is moved into abutment against the second piston valve surface 129 of the piston 120 is shown as FIG. 1, thus, prevents the liquid from the second pump cylinder 34B flows into the shaft channel 54th

FIGS. 5 and 6 show the operation of the pump 10. Fig. 5 shows the pump shaft 50 to move to the second end of the housing 32 of the pump housing 30 by the external force of an operator, and Fig. 6 shows the pump shaft 50, on his return to the first end of the housing 31 of the pump housing 30 is under the action of the spring 90th

When the dispenser head 60 is retracted by an operator, the pump shaft 50 moves to the second housing end 32 of the pump housing 30 and the pump shaft 50 moves with respect to the piston 120. The second stem valve seat 112 is of the second piston valve surface 129 to open the inlet ports adjusted 101-103 of the stem channel and the first shaft valve seat 111 keeps the sliding seal with respect to the first piston valve surface 128 upright, to prevent that the liquid flows from the second pump cylinder 34B in the first pump cylinder 34A. The first one-way valve 80 remains in the closed position, the movable valve 84 to the valve seat seals the 82nd

The movement of the pump shaft 50 to the second end of the housing 32 of the pump housing 30 reduces the volume of the second pump cylinder 34B to pump fluid within the second pump cylinder 34B into the shank passage 54 of the pump shaft 50, as is shown by the arrows in Fig. 5. The liquid is pumped to the first shaft end 51 and through the outlet duct 62A for dispensing from the outlet opening 62nd

When the pump shaft 50 is moved to the second end of the housing 32 of the pump housing 30 defines the piston 120, the vent opening 39 free, which extends through the pump cylinder wall 36 of the pump housing 30th The vent opening 39 allows the ventilation of the container 20 from the atmosphere along the annulus 25 between the pump shaft 50 and the pump cylinder wall 36 and inner wall 71 of the sleeve 70th

Fig. Figure 6 shows the pump stem 50 during its return to the first housing end 31 of the pump housing 30 under the action of the spring 90. When the dispenser head 60 is returned by the spring 90, the pump shaft 50 moves to the first housing end 31 of the pump housing 30 and the pump shaft 50 moves with respect to the piston 120. the first stem valve seat 111 maintains a sliding seal against the first valve piston surface 128 upright and closes the inlet ports 101, 103 of the stem channel. The second drain valve seat 112 moves into abutment against the second valve piston surface 129 is prevented so that the liquid flows from the pump cylinder 34B in the shaft channel 54 of the pump shaft 50th While maintaining the movement of the pump shaft 50 of the plunger covered 120 from the vent opening 139, which extends through the pump cylinder wall 36 of the pump housing 30th

The movement of the pump shaft 50 to the first housing end 31 of the pump casing 30 increases the volume of the second pump cylinder 34B, so that the internal pressure prevailing therein is reduced. The reduced pressure in the second pump cylinder 34B causes the movable valve 84 disengages from the sealing engagement with the valve seat 82 to open the first one-way valve 80th The open, first one-way valve 80 makes it possible that the liquid through the suction pipe 78 penetrates in the tank 20 into the second pump cylinder 34B, as shown by arrows in Fig. 6.

The pump 10 includes a locking device 150 for locking the dispenser head 60 in the extended position of FIG. 1 and for locking the dispenser head 60 in the pump stroke end position in Fig. 3. The locking device 150 includes first and second locking cam 151 and 151A, which are extending radially from the pump shaft 50 to the outside. The blocking device 150 further includes first and second locking blocks 161 and 161A, extending radially with respect to the pump cylinder 34 of the pump housing 30 to the outside. The first and second locking blocks 161 and 161A extend from the cylindrical wall 71 of the inner sleeve 70 radially inwardly.

Fig. 7 is a partially broken away isometric view of a portion of the inner sleeve 70 in Fig. 2 showing the first locking block 161, wherein the second locking block 161A a mirror image representation of the same. The first locking block 161 forms a first and a second locking block surface 171 and 172. Each of the first and second locking blocks 161 and 161A extending in circumferential direction over an angle of approximately 90 ° about the inner sleeve 70. A first and a second gap 201 and 202 is 161 and 161A formed between the first and second check valves.

First stops 181 and 181A extend radially inwardly and axially toward the first end of the housing 31 of the pump housing 30 for limiting the rotation of the pump shaft 50 when the dispenser head 60 is in the protruding position. Second stops 182 and 182A extending radially inwardly and axially toward the second end of the housing 32 of the pump housing 30 for limiting the rotation of the pump shaft 50 when the dispenser head 60 is in the retracted position.

Fig. 8 is a partially broken away isometric view of a portion of a pump shaft 50 in FIG. 2 with a representation of first and second locking cam 151 and 151A, extending from the pump shaft 50 radially outwardly. The first and second locking cam 151 and 151A serve to move through the first and second gaps 201 and 202 to 161 and 161A to avoid the first and second check valves.

Fig. 9 is a cross section along line 9-9 in Fig. 1, wherein the pump shaft 50 is disposed in an operating position that enables dispensing of the liquid from the container 20. Fig. 10 is a central longitudinal section along the line 10-10 in Fig. 9, while Fig. 11 is a partially cutaway, top isometric view of FIG. 9.

The dispensing head 60 is shown rotated, the first and second locking cam 151 and 151A of the pump shaft 50 are moved out of the escape direction to the first and second check valves 161 and 161A. The first and second locking cam 151 and 151A are shown in alignment with the first and second spaces 201 and 202, so that the first and second locking cam 151 and 151A 201 and 202 can be moved through the first and second gaps respectively. In this rotational position of the dispensing head 60 of pump shaft 50 can be moved between the extended position and the retracted position back and forth to pump the liquid from the container 20 through the outlet opening 62nd

Fig. 12 is a cross section similar to FIG. 9, wherein the pump shaft 50 is locked in the extended position to prevent movement of the dispensing head 60. Fig. 13 is a central longitudinal section along the line 13-13 in Fig. 12, while Fig. 14 is a partially cutaway, top isometric view of Fig. 12.

The dispenser head 60 is shown rotated in the extended position, wherein the first and second locking cam 151 and 151a of the pump shaft 50 is aligned with the first and second check valves 161 and 161A. The first and second locking cam 151 and 151A are as 171 and 171A shown aligned with respect to the first locking block surfaces in order to prevent movement of the dispenser 60 head to the second end of the housing 32 of the pump housing 30th The first stops 181 and 181A limit a rotational movement in the clockwise direction in Fig. 12, after the first and second locking cam 151 and 151A of the pump shaft 50 are hinged to each of the first stoppers 181 and 181A. The first and second locking cam 151 and 151a of the pump shaft 50 are shown for reasons of clarity of illustration in the various figures of the drawings, as adjusted by the first stoppers 181 and 181A.

If an operating person wishes 10 to return the pump to the working position according to FIG. 9 to 11, the dispensing head 60 is rotated counterclockwise in Fig. 12. The first and second locking cam 151 and 151a of the pump shaft 50 are respectively at the first stoppers 181a and 181, to limit the counterclockwise rotation of the pump shaft 50 and the first and second locking cam 151 and 151A with respect to the first and second spaces 201 and 202 align. When the first and second locking cam 151 and 151A aligned with respect to the first and second spaces 201 and 202, the first and second locking cam can be 151 and 151A moves through the first and second spaces 201 and 202, so that the pump shaft 50 moves back and forth can be in order to pump the liquid from the container 20 through the outlet opening 62nd

Fig. 15 is a cross section similar to FIG. 9, wherein the pump shaft 50 is locked in the retracted position to prevent movement of the dispensing head 60. Fig. 16 is a central longitudinal section along the line 16-16 in Fig. 15, while Fig. 17 is a partially broken-away, bottom isometric view of FIG. 15 is.

The dispenser head 60 is shown rotated in the retracted position, wherein the first and second locking cam 151 and 151a of the pump shaft 50 opposite the first and second locking blocks are aligned 161 and 162nd The first and second locking cam 151 and 151A are compared with the second locking surfaces 172 and 172A shown aligned in order to prevent movement of the dispensing head 60 in the direction of the first housing end 31 of the pump housing 30th The second stops 182 and 182A limit a rotational movement in the clockwise direction in Fig. 12-14, after the first and second locking cam 151 and 151A of the pump shaft 50 are hinged respectively at the second stops 182 and 182A.

When an operator wishes 10 to return the pump to the working position according to FIG. 9 to 11, the dispensing head 60 is rotated counterclockwise in Fig. 15. The first and second locking cam 151 and 151a of the pump shaft 50 are respectively at the second stops 182A and 182 to limit the rotational movement in the counterclockwise direction of the pump shaft 50 and the first and second locking cam 151 and 151A with the first and second spaces 201 and 202 align. When the first and second locking cam 151 and 151A aligned with respect to the first and second spaces 201 and 202, the first and second locking cam can be 151 and 151A moves through the first and second spaces 201 and 202, so that the pump shaft 50 moves back and forth can be in order to pump the liquid from the container through the outlet opening 62nd

The pump according to the invention is prevented by the described overlapping area 61 between the dispensing head 60 and the outer end of the sleeve 73 in any position of the pump shaft 50 penetration of foreign matter or liquids from the outside that the finished to a reduction in quality or contamination in the with the pump can cause fluid reservoir contained. Here, moreover, the functionality of the pump is maintained, the sic easily h either in the extended Aussgangsstellung or in the retracted pump stroke end position can lock.

LIST OF REFERENCE NUMBERS

<dl id="dl0002" compact="compact"><dt>10</dt><dd>pump</dd><dt>25</dt><dd>Annulus (zw.Schaft 50 u. Sleeve 70)</dd><dt>30</dt><dd>pump housing</dd><dt>31</dt><dd>first housing end</dd><dt>32</dt><dd>second housing end</dd><dt>34</dt><dd>internal pump cylinder</dd><dt>34A</dt><dd>first inner pump cylinder</dd><dt>34B</dt><dd>second inner pump cylinder</dd><dt>36</dt><dd>Pump cylinder wall</dd><dt>38</dt><dd>radial flange</dd><dt>39</dt><dd>ventilation opening</dd><dt>40</dt><dd>lock</dd><dt>42</dt><dd>center opening</dd><dt>44</dt><dd>internal thread</dd><dt>50</dt><dd>pump shaft</dd><dt>51</dt><dd>first shank end</dd><dt>52</dt><dd>second shaft end</dd><dt>54</dt><dd>Passageway</dd><dt>60</dt><dd>dispensing head</dd><dt>61</dt><dd>Coverage area</dd><dt>62</dt><dd>outlet opening</dd><dt>62A</dt><dd>outlet channel</dd><dt>63</dt><dd>tubular connecting stub</dd><dt>64</dt><dd>Through hole</dd><dt>65</dt><dd>sealing cap</dd><dt>66</dt><dd>connecting pieces</dd><dt>67</dt><dd>clearance</dd><dt>68</dt><dd>cylindrical guide channel</dd><dt>69</dt><dd>upper sleeve opening</dd><dt>70</dt><dd>shell</dd><dt>71</dt><dd>cylindrical inner wall</dd><dt>72</dt><dd>cylindrical outer wall</dd><dt>73</dt><dd>outer cylindrical sleeve end </dd><dt>74</dt><dd>latching elements</dd><dt>75</dt><dd>latching elements</dd><dt>76</dt><dd>gorget</dd><dt>78</dt><dd>suction tube</dd><dt>79</dt><dd>receiving opening</dd><dt>80</dt><dd>first one-way valve</dd><dt>82</dt><dd>valve seat</dd><dt>84</dt><dd>movable valve</dd><dt>90</dt><dd>feather</dd><dt>91</dt><dd>first Federabschnittt</dd><dt>92</dt><dd>second spring portion</dd><dt>93</dt><dd>intermediate section</dd><dt>100</dt><dd>narrowed shank end</dd><dt>101</dt><dd>Shank channel input openings</dd><dt>102</dt><dd>Shank channel input openings</dd><dt>103</dt><dd>Shank channel input openings</dd><dt>106</dt><dd>shank recess</dd><dt>108</dt><dd>annular Schaftwulst</dd><dt>108D</dt><dd>Schaftwulstdurchmesser</dd><dt>109</dt><dd>shaft shoulder</dd><dt>111</dt><dd>First stem valve seat</dd><dt>112</dt><dd>second shaft valve seat</dd><dt>120</dt><dd>piston</dd><dt>122</dt><dd>rigid cylindrical member (piston)</dd><dt>124</dt><dd>center opening</dd><dt>126</dt><dd>annular shoulder</dd><dt>126D</dt><dd>Ring shoulder diameter</dd><dt>128</dt><dd>first piston valve surface</dd><dt>129</dt><dd>second piston valve surface</dd><dt>131</dt><dd>First seal coat</dd><dt>131A</dt><dd>outer end</dd><dt>132</dt><dd>second seal coat</dd><dt>132A</dt><dd>outer end</dd><dt>134</dt><dd>annular piston carrier</dd><dt>140</dt><dd>second one-way valve </dd><dt>150</dt><dd>locking device</dd><dt>151</dt><dd>first locking cam</dd><dt>151A</dt><dd>second locking cam</dd><dt>161</dt><dd>first locking block</dd><dt>161A</dt><dd>second locking block</dd><dt>171</dt><dd>first locking surface</dd><dt>171A</dt><dd>first locking surface</dd><dt>172</dt><dd>second blocking surface</dd><dt>172A</dt><dd>second blocking surface</dd><dt>181</dt><dd>first stop</dd><dt>181A</dt><dd>first stop</dd><dt>182</dt><dd>second stop</dd><dt>182A</dt><dd>second stop</dd><dt>201</dt><dd>first gap</dd><dt>202</dt><dd>second gap</dd></dl>