FR2526403A1 - HAND-OPERATED PUMP ASSEMBLY - Google Patents

Abstract

THE INVENTION RELATES TO A HAND-ACTUATED DISPENSING PUMP. IT INCLUDES A CYLINDRICAL BODY 15 IN WHICH A PISTON 25 SOLIDARITY OF A ROD 38 CAN SLIDE WHICH RISES ABOVE THE UPPER END OF THE BODY. A SPRING 23 MOVES THE PISTON UP. A RETURNED RING 56 INCLUDES A LOWER SKIRT HERMETICALLY IN THE UPPER OPENING OF THE BODY. THE LATTER CONTAINS FINGERS 53 INTENDED TO SNAP ELASTICALLY WITH A CLOSING ELEMENT 71 TO HOLD THE BODY, THE PISTON, THE RING AND THIS CLOSING ELEMENT IN THE ASSEMBLED STATE, FORMING A PUMP. FIELD OF APPLICATION: PUMPS FOR THE DISTRIBUTION OF FLUIDS CONTAINED IN CONTAINERS HELD BY HAND.

Description

The invention relates to a dispensing pump designed to be fixed on

  hand-held containers for liquids, the pump being intended for

  to discharge liquids from these containers by

  with the fingers. A wide variety of hand-held, vertical reciprocating dispensing pumps are used to dispense liquid products from

  hand-held containers, the distribution takes place

  killing by a vertical reciprocating motion of the diver

  These pumps are mounted on the upper part

  containers in a number of different ways Current manufacturing processes for the production of finger-operated reciprocating pumps require that the component parts be

  assembled in a machine during an assembly operation

  carried out at high speed in order to achieve

  savings to sell pumps cheaply.

  Various means are used to maintain together

  parts of the pump after they have been assembled.

  In most pumping devices, a spring exerts upward pressure on the piston and rod assembly and tends to urge it out of the assembled pump unless means are used to retain the piston assembly. Inside the pump body A finger-operated reciprocating pump described in US Pat. Nos. 3,198,403 and 3,223,292 utilizes a valve stem whose end lower one presents a

  protrusion that bears against the lower end of the res-

  and the upper end of which has a widened ball-shaped valve head, which engages a shoulder in the hollow stem of a piston to effectively seal the pump to prevent leakage when the pump is in its position. normal position raised or not actuated In these types of pumps, the rod does not undergo any pressure tending to eject it out of the pump chamber. Therefore, it is not necessary in these pumps, that the rod is retained by the closure device which can generally be a ferrule for clamping on containers with a protruding flange in the neck Finger-operated pumps can be assembled by means of an internally threaded cap, the inner side of which skirt has a bead that resiliently locks with a flange at the top end of the reservoir or

pump body.

  Another technique of assembling parts

  pump, particularly plastic parts

  that, is described in the United States patents

  No. 3,128,018 and No. 3,154,615 In these dispensing pumps

  finger operated actuators, the piston assembly and

  stem is held inside the body under the compres-

  spring by means of a projecting bead

  towards the inside of the body in order to bear against the

  The bead is produced by the method described in the aforementioned US Pat. No. 3,154,615, in which a hot tool drives the inner part of the body to roll a bead intended for

  against the piston and, in addition, simultaneously

  a bead on the upper end of a one-piece ring, located on the body of the pump, to connect the threaded cap to the pump to complete the assembly of the latter In these types of pumps, the piston and rod assembly is held in the lowered position by screwing a ring on the head of the pump, the threads being formed on the cylindrical element located

  at the upper end of the pump body.

  Another means of attaching the parts of a finger operated dispensing pump is described in US Pat. No. 3,391,647.

  which indicates that a compression spring normally pushes

  the piston to the up position and is held under slight compression by bearing against a shoulder on the piston rod, a seat being provided in a rim projecting downwardly about the rod which is carried by a main ring resiliently engaging the upwardly protruding cylindrical portion of a section integrally formed with the pump cylinder The threaded cap of the container is housed on the top of the flange provided on the body of the container. pump and

  it is held between the flange and the sleeve fitted

  The pump can be stored and transported in the lowered position by interlocking a bead of the atomizer head in a recess provided in a

  ring protruding upwards at the upper end

the ring.

  The assembly of powered dispensing pumps

  fingers may use a washer intended to

  rust together the pump parts as described

  in U.S. Patent No. 4,050,860.

  The washer is held in the body by means of a bead formed on the washer and housed in a groove of the body The washer has, at its upper end, a locking bead which holds the cap of

  closing when it is lowered by force on the bead.

  Although all the means described above for assembling pumps for transport to the customer have been satisfactory, there remains the need to

  have a pump that can be assembled automatically-

  mechanized assembly equipment at high speed, and with sealing characteristics

  when it is locked in a lowered or posi-

"transport".

  The invention therefore relates to a pump assembly which comprises a cylindrical body whose ends

  upper and lower each have an opening.

  A piston module, which carries a piston, is housed so as to slide in the body and has a hollow rod connected to the piston and projecting towards

  outside, at the upper end of the body.

  lower part of the elastic member arranged in the

  of the body rests on the lower end of the body and its upper end bears against the underside of the piston to solicit the latter

  to the top A ring can slide around the stem.

  The ring has an inferior bottom skirt which is sealingly housed in the upper opening of the body A hood closure member connects the body

to the ring.

  The invention will be described in more detail with reference to the accompanying drawings by way of non-limiting examples and in which: FIG. 1 is a partial longitudinal section of the dispensing pump according to the invention; Figure 2 is a partial longitudinal section of the dispensing pump according to the invention, similar to that shown in Figure 1, this view showing the piston assembly of the pump in the lowered position or transport position; Figure 3 is a partial longitudinal section, on an enlarged scale, of another embodiment of the dispensing pump according to the invention; Figure 4 is a partial longitudinal section, on an enlarged scale, of the upper end of the body of the dispensing pump according to the invention; Figure 5 is a partial elevation, on an enlarged scale, of the upper end of the body of the pump according to the invention; Figure 6 is a top view, on an enlarged scale, of the body, shown in Figure 5, of the dispensing pump according to the invention; Figure 7 is an elevation, on an enlarged scale, of the ring of the dispensing pump according to the invention; Figure 8 is a top view of the ring shown in Figure 7; Figure 9 is a longitudinal section of the ring, taken along the line 9-9 of Figure 8;

  Figure 10 is a partial longitudinal section

  on an enlarged scale of the farmhouse unit

  ture and ring of the second embodiment of the dispensing pump according to the invention, shown in Figure 3; and FIG. 11 is an elevation, broken away

  partial and enlarged scale of the pump piston

tributary according to the invention.

  As shown in particular in FIGS. 1 and 2, the dispensing pump according to the invention comprises

  a cylindrical body or envelope, designated globally

  The lower end of the pump body has a cylindrical extension

  hollow 16 in which is housed and is retained by rubbing

  The upper end of a plunger tube 17 A valve seat 18, made in one piece with the body

  of the pump, protrudes upwards from the lower end

  A lower check valve 19 is located in the upper end of the seat 18 and closes the opening 20, allowing a fluid to enter the tank or the body of the pump, from the dip tube 17 A cylindrical recess 21 is formed in the lower end of the body of the pump and receives the lower end 22 of a helical spring 23 which comprises two turns 33 of reduced diameter, located about 5 or 6 turns from the end. lower 22 and the upper end 36 of this spring The diameter of the turns 33 is smaller than the diameter of the ball 19 of the lower check valve When the pump is locked down, or in its transport position and

  storage, as shown in Figure 2, the lower turn

  33 of reduced diameter makes the ball 19 of the bottom check valve firmly bear against the lower seat 18 so that a sealing, preventing

  leaks, be carried out between these elements.

  The lower end of a piston assembly, indicated generally by the numeral 24, is housed inside the body of the pump.

  piston comprises a piston made in one piece, indi-

  The piston is substantially cylindrical in shape and has a

  thin and flexible upper skirt 26, extending towards the former

  interior, which makes a sliding and sealing contact with the inner wall 27 of the body of the pump The piston comprises a lower skirt 28 of the outer surface

  which protrudes a bead 29 which achieves a

  sliding and sealed tact with the inner wall 27 of the pump body When the piston assembly 24 is locked in the lower position or in the transport position as shown in Figure 2, the lower skirt 28 with the bead of the piston is housed in an annular groove 30 formed in the lower end of the body 15 La

  central portion 31 of the piston 25 has a recess diameter

  compared to that of the upper and lower skirts

  piston and defines an open annular space 32 between its outer wall and the inner wall 27 of the pump body. As shown in FIG. 1, when the piston assembly is in its up position or the actuating position of the pump, a vent hole 34 formed in the body 15 of the pump opens into the annular space 32 which is closed so as not to communicate with the lower and upper parts of the internal space of the body of the pump by means of the upper and lower skirts of the piston The interior of the hollow piston comprises a shoulder 35 against which the upper end 36 of the spring 23 bears. The lower section of the inner wall of the central portion 31 of the piston is made in one piece with many

  reinforcement ribs 37 extending downwardly.

  The upper part of the piston assembly 24 comprises a hollow rod 38 which is made of a single

  piece with this set 24 However, if this is often

  The stem and the piston can be separately formed and connected to each other by any suitable means. A seat 39 of the upper check valve is made of a

  single piece with the inner wall 40 of the rod 38.

  The upper check valve has an opening 41 which allows the passage of a fluid. A top ball 42 of the valve closes the opening formed in the seat 39 when the piston assembly is at rest or during operation.

  rising race of this set A beak, designated global-

  43, is attached to the end

  The spout has an annular skirt

  lower wall 44 whose inner wall has annular beads 45 which are housed in recesses

  46 formed in the outer wall of the upper end

  upper part of the stem 38 The engagement of the

  nular 45 and recesses 46 holds the beak on the ex-

  stem of the stem once it has been nested under a certain pressure on this rod The outer surface

  of the skirt 44 of the spout comprises helical threads 47.

  The lower extreme surface of the skirt has a groove 48 facing upwards The spout has a channel

  49 allowing the flow of the fluid to be dispensed

fogged by the pump.

  As shown in Figures 1, 2 and 4 to 6, the upper end of the body 15 has a thickened wall section 50 having a plurality of recesses 51 of rectangular shape These recesses 51 are used by the assembly machine to properly orient the body so that it receives the other parts of the pump during assembly The upper end of the body 15 is formed in one piece with an annular flange 52 extending outwardly The wall of the body 15 is made of one piece with two opposite fingers 53 which protrude upwardly from the flange 52 and which comprise, at their upper end, a shoulder portion 54 The inner wall 27 of the body 15 terminates at its upper end by a conical portion 55, angled outwards, as shown more clearly

in Figure 4.

  As shown in FIGS. 1, 2 and 7 to 9,

  a ring, designated globally by the numerical reference

  56, has a lower skirt 57 which is housed, by friction fit, in the open upper end of the body 15, as can be seen in Figures 1 and 2 The lower skirt 57 has an outer wall 58 and an inner wall 59 separated by an annular space 60, as shown in FIG.

  outer diameter of the outer wall 58 is light-

  greater than the inside diameter of the body 15 and the conical shoulder 55 forces the outer wall 58 to flex so that it can be forced into

  the upper end of the body 15 The stem 38 of the

  appears to piston applies while sliding against the wall

Inside 59.

  As can be seen more particularly in FIGS. 7 to 9, the ring 56 is made in one piece with a flange 61 which has two sides

  opposed plates 62 and two opposite curved sides 63 Cepen-

  However, if desired, the flange can be cylindrical.

  that the flange 61 has two opposite openings 64 of

  curved shape, formed in its curved sides 63 The

  upper portion 65 of the ring 56 is of a substantially

  The outer wall 67 of the upper portion 65 of the ring has two opposed recesses 68 which closely receive the fingers 53 of the body 15. As shown in FIG. 8, a web 69, connecting the outer and inner walls of the ring skirt, has opposed curved openings so that the air vents can communicate with the opening 34 during the downward stroke of the piston assembly to allow air to flow. replace the liquid,

  inside the container, when the product is repressed.

  As shown in FIGS. 1 and 2, the body 15 of the pump and the ring 56 are connected to each other.

  the other by means of a closure element designated

  by the reference number 71 This element of

  71 comprises an upper portion 72 which has a central cylindrical opening freely surrounding the

  outer wall 67 of the upper part of the ring.

  The upper closing part is made of a single

  piece with a downward skirt 73 whose inner wall -

  top has threads 74 The diameter of the opening

  center of the upper part 72 of the farm element

  It is slightly larger than the diameter of the upper portion 65 of the ring, but it is smaller than that of the shoulder 54 projecting from each of the fingers 53. Therefore, during assembly of the pump, when the lower skirt of the ring the ring 71 is positioned in the upper opening of the body 15, the closure element 71 is forced downwardly above the shoulders 54 of the fingers 53 and snaps resiliently below the shoulders so as to be held in this position With the flange 61 of the ring and the flange 52 of the body, when the closure element is lowered by tight screwing onto the threaded neck of a container, the flanges 61 and 52 are pulled in contact against each other. other, or close together,

  to firmly seat the skirt of the ring in the

  vertex located at the upper part of the body to form a seal opposing leaks between the body and the skirt

bottom of the ring.

  When assembled, the piston assembly 24 is retained in the body 15, even though the spring 23 is under compression, by abutting the shoulder 14

  located at the lower end of the rod 38 with the ex-

  lower end of the inner wall 59 of the ring,

as shown in Figure 1.

  Figures 3 to 10 show another form

  of the dispensing pump according to the invention.

  In this embodiment, the ring and the element

  The closure members, separated and used in the embodiment described above, are made in one piece. The assembly formed by the ring and the element

  closure, indicated globally by the numerical reference

  75, comprises an upper part substantially

  cylindrical 76 forming a ring which has internal threads

  The lower skirt 57a is made in one piece with the upper ring and is of the same embodiment as that described above for the lower skirt 57 of the ring 56 of the first embodiment, this skirt having holes for opposed vents 84 permitting the passage of air The assembly 75 formed by the closure element and the ring comprises an upper portion 78 which is made in one piece with the upper ring

  76, the lower skirt 57a of the ring and the lower skirt

  The inner wall 80 of the skirt 79 has a plurality of spaced apart projections 81 for screwing. The front end 82 of each projection has a shoulder. 83 which is intended

  to engage with a recess in the underside

  helicoidal nets formed on the neck of the container.

  to be used with this type of farm element.

  to form a closure device to the test

  children for the pump and the container.

  The piston assembly of this form of embodiment

  is the same as that used in the form of reali-

  DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 3, in this variant of the dispensing pump, the flange 52 located at the top of the body 15 may be attached to the underside of the upper portion 78 of the closure member assembly. ring, the fixing being carried out by rotational welding, ultrasonic welding or by means of adhesives, or by means of

  elastic engagement can be used to assemble

blister both elements.

  Most parts of the pump can be

  made by injection molding of any thermo-

  suitable plastic such as polypropylene, polyethylene,

  high density ethylene, polycarbonate, acetal, acrylonitrile-butadiene-styrene or any other suitable semi-rigid thermoplastic material The spring is preferably made of stainless steel The upper and lower ball check valves may also be However, one or both of the check valves may be made of plastic, for example polycarbonate or "nylon".

Claims (8)

  1 Pump assembly operated by hand, characterized   characterized in that it comprises a hollow cylindrical body (15) which has an open upper end and an open lower end, a piston assembly (24) comprising a piston (25) slidable in the body (15) and which is a rod (38) which protrudes outwardly from the upper end of the body, a spring member (23) disposed within the body (15) and urging the piston (25) upwardly, a an insert ring (56) having a central opening in which the rod (38) can slide and an inferior bottom skirt (57) housed in the open upper end of the body, and retaining means including an element   closure (71) which connects the body to the ring.   2. Assembly according to claim 1, characterized in that the retaining means comprise a flange (52) located at the upper end of the body (15), a flange   (61) on the ring (56), and members (54) for retaining   cooperating with the closure element (71) to retain   the flanges assembled to one another.   3 assembly according to claim 2, characterized in that the retaining members comprise at least two fingers (53) projecting upwardly from the flange (52) located at the upper end of the body (15) and passing through openings formed in the flange (61) of the ring (56), and a closure cap (71) adapted to engage with the fingers to retain the lower end skirt (57) of the ring (56) in the opening. located   at the upper end of the body.   4 assembly according to claim 2, characterized in that the flange (61) of the ring (56) comprises two   flat sides parallel and opposite.   An assembly according to claim 2, characterized in that the piston has a thin annular upper skirt (26) facing outwards, which slides against the inner wall (27) of the body (15), and a lower skirt which has a bead ring (29) surrounding its outer face and sliding against the inner wall (27) of the body (15).   6 assembly according to claim 3, characterized   in that the coupling means comprise shoulder   (54) extending outwardly on the ends   fingers <53), and in that the closing cap (71)   ture has an opening in the upper surface   (72) and receiving the ring, the closing cap   ture being disposed between the shoulders (54) at the ends of the fingers (53) and the top of the flange (61) of the ring (56).   7 assembly according to claim 3, characterized   in that the ring has recessed portions (68) extending   above the openings (64) in the flange   (61) to receive the fingers (53) of the body (15).   8 assembly according to claim '3, characterized in that the skirt (57) of the ring (56) has an outer portion (58) and an inner portion (59) separated by an annular space (60).   9 assembly according to claim 8, characterized in that the inner and outer parts of the skirt are connected at their upper end by a wall   cross section (69) having at least one opening (70).   Assembly according to claim 9, characterized in that the body (15) has an opening (34) arranged   in the side wall, which opening communicates with-   the opening (70) of the transverse wall (69) of the ring (56) when the piston assembly (24) is in the lowered position. 11 assembly according to claim 1, characterized in that it comprises a member (75) comprising a closure element and a ring made in one piece and having an upper annular portion (76) which is formed in one piece with a cylindrical skirt (79)   extending downwards, the skirt comprising a plurality of   screwing rods (81) located on its inner wall and intended to engage with external threads disposed on the neck of a container on which the pump assembly is designed to be fixed.   Assembly according to claim 11, characterized   characterized in that the projections have, at their forward end (82), barbs designed to fit into recesses in the underside of the threads of the   pdulot a container to be attached to the pump.