Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
  • A61C5/62—Applicators, e.g. syringes or guns
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/31—Details
  • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
  • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
  • A61M2005/3152—Piston or piston-rod constructions, e.g. connection of piston with piston-rod including gearings to multiply or attenuate the piston displacing force
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/31—Details
  • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
  • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
  • A61M5/31576—Constructional features or modes of drive mechanisms for piston rods
  • A61M5/31583—Constructional features or modes of drive mechanisms for piston rods based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod
  • A61M5/31586—Constructional features or modes of drive mechanisms for piston rods based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod performed by rotationally moving or pivoted actuator, e.g. an injection lever or handle

Definitions

• the invention relates to a device for ejecting a liquid or pasty product.
• a conventional and very simple device for ejecting a product used in particular in the medical or dental fields, is in the form of a substantially cylindrical straight syringe comprising an anterior cartridge containing the product to be ejected and a cylindrical rear piston and rectilinear, mobile in translation within the cartridge.
• An operator simply pushes the piston that slides inside the cartridge by ejecting the product through the front end of the cartridge, on which a needle is mounted.
• the manufacture of such a syringe meets important requirements of hygiene and sterility, especially as regards the integration of the product in the cartridge.
• a disadvantage of this solution comes from the fact that it is difficult to handle such a syringe because the thrust of the piston is unfriendly, and makes it impossible to control the ejection of a precise dose, and with a controlled speed. This disadvantage makes it unsuitable for certain fields such as cosmetic surgery which requires the ejection of small doses with great precision and the use of sometimes dense or even pasty products, such as hyaluronic acid, requiring a large ejection force. .
• WO2008 / 107813 proposes an ejection device having a simpler construction, easily removable and cleanable.
• This device comprises a body, a portion intended to contain the product and provided with an orifice for the ejection of the product, a pushing cylinder provided with rack-type teeth, moving in a bore of the body and varying the volume of the product.
• This solution has the advantage of great simplicity and better control of the ejected dose. Such a minimum ejected dose corresponds to the distance between two teeth of the thrust cylinder.
• a thrust cylinder according to this construction can not generally include more than fifty teeth on the thrust length used, which proves insufficient, especially in the field of cosmetic surgery, as well as for some dental applications.
• increasing the number of teeth requires the reduction of their size, which induces their less good grip and a decrease in the reliability of the ejection device.
• a general object of the invention is to provide an ejection solution of a liquid or pasty product overcoming the drawbacks of existing solutions. More specifically, a first object of the invention is to provide an ejection solution of a liquid or pasty product for controlling with great precision the ejected dose.
• a second object of the invention is to provide an ejection solution of a liquid or pasty product with a maximum degree of hygiene.
• a third object of the invention is to provide a solution for ejection of a liquid or pasty product simple and inexpensive.
• the invention is based on a device for ejecting a liquid or pasty product, comprising a body having a housing for receive a product to be ejected, characterized in that it comprises a threaded rod movable in translation so as to act on the product to be ejected, a bolt mounted in cooperation with the threaded rod to induce its displacement in translation, and a lever acting on the bolt by a control means to induce its rotation.
• the control means may comprise a pawl linked to the lever.
• the lever may be rotatably or flexibly mounted about an axis disposed in its rear portion. This axis may further be at its rear end and comprise a removable attachment means of this axis on the body of the ejection device.
• the lever and the ratchet can form the same molded plastic component.
• the bolt may comprise teeth or lights cooperating directly or indirectly with the pawl, these teeth or lights being disposed on its outer peripheral surface, the profile of the teeth extending in a vertical transverse plane and / or in a vertical longitudinal plane.
• the pawl may be in the form of a rod connected to the lever on a first end, forming an elastically movable rod or not, and may comprise a second end adapted to cooperate with teeth of a rack, comprising a rectangular end and / or one or more teeth towards this second end, or a second end comprising a rounded portion adapted to cooperate with a light.
• the ejection device may comprise a rack rotatably mounted around the threaded rod and comprising a plurality of teeth disposed on its outer peripheral surface whose profile extends in a transverse vertical plane to cooperate with the pawl, and comprising at least one tooth oriented in a longitudinal direction to cooperate with the bolt so as to drive it in rotation when actuating the lever.
• the teeth of the bolt or rack may have a tip profile and be asymmetrical or have a symmetrical profile rectangular, conical or trapezoidal.
• the bolt control means may include one or more intermediate gears for multiplying transmission of rotational speed to the bolt.
• the bolt may comprise an alternation of inclined lights and longitudinal lights arranged on its outer cylindrical surface.
• the ejection device may comprise a pawl connected to the lever, one end of which cooperates with the bolt slots and / or comprise an actuating element at its end comprising a plurality of co-operating elements cooperating with the bolt slots, to induce the rotation of the bolt. bolt when operating the lever.
• the ejection device may further comprise a non-return device comprising an elastic blade or one or more teeth connected to the body of the device and in cooperation with the bolt to form a non-return device of the bolt preventing its reverse rotation. when releasing the lever.
• the non-return device may comprise a cylindrical component arranged at the bore in which the threaded rod moves, comprising teeth extending in a longitudinal direction on one of its ends, which cooperate with at least one complementary tooth extending in the longitudinal direction of the bolt.
• the ejection device may comprise means for emitting an audible click when ejecting a minimum dose by actuating the lever.
• the ejection device may comprise a body comprising an anterior part integrating the product to be ejected and a distinct rear part integrating the bolt. Finally, it can comprise at least one tool holder disposed in the front part of the body of the ejection device and / or a tool holder disposed in the front part of the body of the ejection device and a Luerlok type locking means. of the tool holder on the ejection device.
• FIG. 2 shows a partial view from the front of the ejection device according to the first embodiment of the invention.
• FIG. 3 represents a partial perspective view of an ejection device according to a first variant of the first embodiment of the invention.
• FIG. 4 represents a partial view from the front of the ejection device according to the first variant of the first embodiment of the invention.
• FIG. 5 represents a perspective view from a first side of the mechanism of the ejection device according to the first variant of the first embodiment of the invention.
• Figure 6 shows a perspective view from the second side of the mechanism of the ejection device according to the first variant of the first embodiment of the invention.
• FIG. 7 represents a partial perspective view of an ejection device according to a second variant of the first embodiment of the invention.
• Figure 8 shows a perspective view from a first side of the mechanism of the ejection device according to the second variant of the first embodiment of the invention.
• Figure 9 shows a perspective view from the second side of the mechanism of the ejection device according to the second variant of the first embodiment of the invention.
• FIG. 10 represents a partial perspective view of an ejection device according to a second embodiment of the invention.
• Figure 1 1 shows a side view of the mechanism of the ejection device according to the second embodiment of the invention.
• Figure 12 shows a perspective view from a first side of the mechanism of the ejection device according to the second embodiment of the invention.
• Figure 13 shows a perspective view from the second side of the mechanism of the ejection device according to the second embodiment of the invention.
• FIG. 14 represents a perspective view of the thrust mechanism of an ejection device according to a third embodiment of the invention.
• FIG. 15 represents a perspective view of the thrust mechanism of an ejection device according to a first variant of the third embodiment of the invention.
• FIG. 16 represents a perspective view of the thrust mechanism of an ejection device according to a second variant of the third embodiment of the invention.
• FIG. 17 represents a perspective view of the thrust mechanism of an ejection device according to a fourth embodiment of the invention.
• Figure 18 shows a sectional side view of the fourth embodiment of the invention.
• Figure 19 shows a perspective view of the thrust mechanism of an ejection device according to a variant of the fourth embodiment of the invention.
• Figure 20 shows a partial perspective view of an ejection device according to the invention comprising a first embodiment of a non-return device.
• Figure 21 is an enlarged perspective view of details of this non-return device.
• Figure 22 shows a perspective view of the thrust mechanism of an ejection device according to the invention comprising a second embodiment of a non-return device.
• Figure 23 shows a partial rear perspective view of the ejection device according to the invention comprising the second embodiment of a non-return device.
• Figure 24 is an enlarged perspective view of details of this non-return device.
• Figure 25 shows a partial side view of the ejection device comprising the second embodiment of a non-return device.
• Figure 26 shows a partial front perspective view of the ejection device according to the invention comprising the second embodiment of a non-return device.
• Fig. 27 is an enlarged front perspective view of details of the ejection device including the second embodiment of a non-return device.
• x the longitudinal axis extending from the rear of the ejection device to its front part, the front part being the end from which the product is ejected
• z the axis vertical perpendicular to the x-axis and passing in the middle part of the lever
• y the transverse axis perpendicular to the two previous axes x, z, as shown in the figures.
• an ejection device serving as a syringe for the dental field, for example to inject a product in the gums, or in the field of cosmetic surgery, for example to inject a dense gel under the skin.
• the invention can be exploited in other fields, for any ejection of liquid product, gel or paste, such as an adhesive for example.
• the ejection device will be partially shown in most of the figures, in order to better visualize the thrust mechanism to which the invention relates.
• the similar components and equivalent functions will be designated by the same reference in the different figures corresponding to different embodiments, despite their shape may vary.
• the concept of the invention consists in combining the use of an advantageous lever with a thrust mechanism based on a threaded rod and a bolt.
• the pressure of the lever allows the displacement of the threaded rod on the basis of a very simple and reliable control means, as will be described below.
• the ejection device consists of a main body obtained by assembling a few separate components, advantageously manufactured by plastic injection. This main body comprises a front portion 2a, connected by a lateral connection means 9 to a rear portion 2b.
• the front part 2a fulfills the function of "container carrier" of the body of the device, that is to say it comprises a storage volume 1 1 of the product to be ejected, while the rear part 2b integrates the mechanism allowing the implementation of the ejection of the product, which will be explained below.
• the front portion 2a can either directly form a volume containing the product to be ejected or have a location to receive a separate cartridge comprising the product to be ejected.
• the ejection device further comprises in its front portion a tool holder 12 for receiving a needle, not shown. In most of the figures, the body 2a, 2b will not be partially shown to allow visualization of the internal mechanism.
• the device may directly comprise a front end forming the ejection tool, such as a pipette for ejection of glues for example, rather than a separate tool holder.
• the ejection device may comprise a locking device, not shown, of the type known and standardized under the name "Luer-lock", which is in the form of a ring fixed around the body of the body. a cartridge so as to prevent detachment of the needle.
• a locking device not shown, of the type known and standardized under the name "Luer-lock”, which is in the form of a ring fixed around the body of the body. a cartridge so as to prevent detachment of the needle.
• the high pressure exerted on the product for ejection is transmitted on the front of the cartridge and the tool holder has the risk of being ejected at high speed forward, in the manner of a dart.
• Figures 1 and 2 show a first embodiment of the invention in which an ejection device comprises an ejection mechanism mainly comprising a lever 1, a threaded rod 3, a bolt 5 and a control means between the lever and bolt.
• the lever 1 is rotatably mounted on the body of the ejection device around a transverse axis 7 positioned in the front part of the lever. It comprises an inclined portion 32 extending from its rounded end forming its axis of rotation 7 to a substantially horizontal portion 33 in its rest position for its actuation. It further comprises an elastic means 6 whose spring type function is to return the lever in its high rest position.
• the resilient means 6 is composed of two resilient blades, one end of which is connected to the lever 1 and the other end bears on a lateral flat portion 13 arranged within the body of the device, which comprises an indentation in its part. upper for the passage of the elastic means 6 and a pawl 4, whose function is explained below.
• the elastic means could include other geometries, a single blade for example. According to another variant, this function of the elastic return means can be fulfilled by the pawl 4.
• a pawl 4 connects the lever 1 to the bolt 5 and performs the main function of control means of the rotation of the bolt 5 from the lever 1. It extends downwards, towards the inside of the body 2b through the upper notch, from the inclined portion 32 of the lever 1.
• the lever 1, the pawl 4 and the elastic means 6 are obtained in a single molding step made of plastic material and these three components form a single piece, a monolithic whole.
• the flexibility of the plastic material and the shape of the connection between on the one hand the pawl and the lever and on the other hand the elastic means and the lever allow an elastic movement of the pawl and the elastic means relative to the lever.
• the lever could alternatively have other geometries, other types of articulation without departing from the concept of the invention.
• the bolt 5 is rotatably mounted around the threaded rod 3. It is fixedly positioned in the longitudinal direction relative to the ejection device, the body of this device having an internal stop preventing any advance or retreat of the bolt 5
• the latter comprises teeth 8 on its outer peripheral surface, whose section in a plane yz, visible in FIG. 2, has tips 38, formed by an asymmetric tooth profile, comprising gently inclined inclined portions 39 and parts 40 substantially oriented in a direction transverse to the longitudinal direction x.
• These teeth 8 of the bolt 5 cooperate with the lower end of the pawl 4, which is positioned abutting between two portions 39, 40 of a tooth 8.
• the threaded rod 3 is fixedly mounted in rotation and free in translation in a central cylindrical bore of the body of the ejection device.
• the lever 1 comprises a horizontal upper portion 33 extending forwardly, to be manipulated, and a downwardly inclined portion 32 comprising an axially-shaped rear lower end 7 which is positioned in a corresponding location of the body. back 2b.
• the axis of rotation 7 of the lever 1 is towards the rear end of the lever 1, and the pawl 4 extends from the inclined portion 32 of the lever to the contact of the teeth 8, which thus form a rack on the outer periphery of the bolt 5.
• the upper horizontal part of the lever can thus be actuated downwards, by a rotation of the lever about the axis 7, thus causing the pawl 4 to bear against the teeth 8 of the rack until to cause rotation of the bolt 5.
• a user acts on the lever 1 by pressing it downwards, causing it to rotate about its axis of rotation 7.
• This movement drives down the pawl 4, whose lower end, positioned in abutment against a tooth 8 of the bolt 5, drives the tooth 8 in its downward movement and thus the bolt 5 in rotation.
• the bolt 5 is fixed in the longitudinal direction of the ejection device, its rotation causes the longitudinal displacement towards the front of the threaded rod 3 whose thread cooperates with the thread of the bolt 5, as can be seen in FIG.
• the advance of the threaded rod 3 allows it to exert a thrust, by a cooperation with a piston before 16 on the storage volume 1 1 of the product contained in the front body 2a of the device, which causes its ejection.
• the spacing of the various teeth 8 of the bolt 5 corresponds to the displacement of the lever 1, so that the pawl 4 optimally allows the actuation of a single tooth for each actuation of the lever 1.
• the bolt 5 comprises 6 teeth on its outer surface, which allows to obtain its rotation of a sixth of a turn each lever operation.
• it takes six lever operations to obtain a complete turn of the threaded rod 3, and thus its longitudinal advance a distance defined by a turn of its thread.
• This solution has the advantage of being able to control a very small displacement of the threaded rod during the actuation of the lever 1, which makes it possible to perfectly control the ejection of small doses of products.
• the bolt could include another number of teeth, depending on the need for precision, the desired strength.
• Figures 3 to 9 show alternative embodiments of the first embodiment, having a similar operation to that described above, wherein a pawl 4 connected to the lever 1 forms the means for controlling the rotation of the bolt 5 which drives the threaded rod 3.
• FIGS. 3 to 6 show a first variant of the first embodiment of the invention, wherein the pawl 4 comprises a tooth 14 towards its lower end of shape cooperating with the teeth 8 of the bolt 5.
• This variant allows to increase the cooperation between the pawl 4 and the bolt 5.
• This tooth 14 has a profile complementary to that of the bolt 5, asymmetrical, so as to promote the driving of the bolt 5 in the ejection phase and non-drive in the phase of raising of the lever.
• FIGS. 7 to 9 show a second variant embodiment of the first embodiment, in which a plurality of teeth 14 are arranged at the lower end of the pawl 4. When the lever 1 is actuated downwards, different teeth 14 come in successive or simultaneous cooperation with teeth 8 of the bolt 5. This solution further strengthens the connection between the pawl 4 and the bolt 5.
• Figures 10 to 12 show a second embodiment of the invention, in which two different parts, positioned around the threaded rod 3, are used to perform rack functions on the one hand and bolt on the other hand .
• the lever 1 always comprises a pawl 4 comprising several teeth 14, which come in cooperation with a rack 10 consisting of a cylindrical part movable in rotation about the threaded rod 3, whose inner cylindrical surface is in simple sliding on the outer surface of the threaded rod, while its outer cylindrical surface forms a rack which cooperates with The ratchet 4.
• the rack 10 further comprises a second series of teeth 18 whose tips are oriented in the longitudinal direction, which cooperate with a complementary tooth 17 of a separate bolt.
• the pawl 4 causes rotation of the rack 10 through the cooperation of their respective teeth 8, 14, similarly to the first embodiment.
• the rack 10 merely rotates in sliding on the outer surface of the threaded rod 3, without directly causing the rotation of the latter.
• the rack 10 comprises complementary teeth 18 which come into cooperation with at least one complementary tooth 17 arranged on the bolt 5, positioned in contact with the rack 10 around the threaded rod 3.
• a tooth 34 of the bolt 5 cooperates with the teeth 43 of a non-return device 42, according to an operation which will be detailed later.
• the elastically erased tooth 34 of the bolt escapes a tooth 43, it suddenly returns to its initial position of rest by elastic effect, emitting a click sound, which allows the user to hear by this click a tooth 43 has been passed, which corresponds to a certain precise dose of ejected product.
• one or more Sound clicks can be expected, depending on the geometry of the teeth involved.
• the pawl 4 causes the rotation of the rack 10 in the opposite direction around the threaded rod, according to the same amplitude as its previous rotation.
• the pawl 4 does not need to move away elastically when raising the lever and this phase is thus facilitated.
• the shape of the teeth 17, 18 of respectively the bolt 5 and the rack 10 is such that the opposite rotation of the rack does not cause the rotation of the bolt. Indeed, the tooth 17 of the bolt, arranged on an elastic blade 19 of the bolt 5, elastically erases during the opposite rotation of the rack without causing rotation of the bolt.
• the cooperation between the pawl 4 and the rack 10 is obtained by teeth more symmetrical profile since the drive of the rack is in both directions of rotation substantially equivalent.
• the profile of the teeth 8, 14 of the teeth respectively of the pawl 4 and the rack 10 may for example have a rectangular profile, conical, or trapezoidal.
• This embodiment reduces the forces exerted on the ratchet, which does not deviate from its natural orientation when raising the lever.
• the control means of the bolt 5 thus consists of a pawl 4 and a rack 10.
• FIG. 14 illustrates a third embodiment of the invention, in which the bolt control means 5 uses an intermediate gear 20 in order to multiply the amplitude of rotation finally transmitted to the threaded rod 3.
• a ratchet 4 has an end which cooperates with an intermediate gear 20 mobile in rotation around of a transverse axis 21.
• the teeth 28 of this gear then cooperate with teeth 8 extending in a longitudinal direction of the bolt 5. The latter then transmits by its rotation a translational movement to the threaded rod, as has been explained previously.
• FIG. 15 illustrates an alternative embodiment of this third embodiment, in which the pawl has a flat portion at its end extending in the longitudinal direction, comprising a plurality of teeth 14, cooperating with the teeth of the intermediate gearing. 20.
• This geometry allows the use of smaller teeth than previously and the cooperation of several teeth at the same time.
• FIG. 16 illustrates a second variant embodiment of this third embodiment, in which a second intermediate gear 22 is used, integral with the first intermediate gear 20 and able to rotate about a transverse axis 21, and comprising a threaded surface which cooperates with bolt teeth 8 arranged on its outer cylindrical peripheral surface, however having an inclination with respect to the longitudinal direction to cooperate with the thread of the intermediate gear 22.
• This third embodiment has the advantage of further refining the translation movement transmitted to the threaded rod 3 by the actuation of the lever 1, and to allow the ejection of very small doses with each actuation. It is thus possible to achieve a lever actuation number greater than 100 for the ejection of the entire product, which is particularly interesting for certain applications requiring great precision such as cosmetic surgery.
• the bolt control means comprises a pawl and one or more gears, all comprising kinds of mechanical connection, by teeth, cams, etc., and any axis of rotation direction.
• Figures 17 and 18 show a fourth embodiment of the invention.
• the pawl 4 connected to the lever 1 has a rounded end 24, like a hemisphere or ball joint, which moves inside lights forming cams arranged on the outer cylindrical surface of the bolt 5. These lights are presented under the form of alternation between slots inclined relative to the longitudinal direction and substantially longitudinal slots 26. In addition, the surface at the bottom of its lights forms ramps which have certain discontinuities which allow the end 24 to be held in place. certain positions, as will be detailed below.
• the end 24 of the pawl 4 is positioned in the rearmost part of an inclined light 25.
• a pushing force is transmitted by the pawl to the bolt 5. More specifically, a longitudinal direction force is applied by the end 24 to the slot 25, the inclination of which represents a ramp which causes the bolt to rotate, while the end 24 of the pawl 4 moves along the inclined light 25.
• the end 24 of the pawl 4 reaches the end of the inclined light 25.
• the length and shape of the inclined light 25 therefore corresponds to the amplitude of movement of the lever between its high position and its lowest position.
• step 27 of the light 26 thus fulfills the anti-return function of the bolt 5, while generating a slight click sound when the ratchet passes through. It therefore represents a third alternative to the two embodiments of non-return devices which will be described later with reference to FIGS. 20 to 27.
• a next pressure of the lever causes the pawl in the next inclined portion 26 of the bolt, causing its rotation again. as explained above.
• one or more additional step (s) may (be) arranged in these lights 25, 26, depending on the application implemented.
• lateral stops 29 prevent lateral movement of the pawl 4 which then moves only in the longitudinal direction. These lateral stops 29 may advantageously be directly integrated into the rear part 2b of the body of the device.
• FIG. 19 illustrates a variant of this fourth embodiment of the invention.
• the bolt is in the same form as before.
• an actuating member 30 of the bolt is disposed at the end of the pawl 4.
• This actuating member 30 has vertical side portions 31, abutting against the body of the ejection device, thereby preventing lateral displacement. It has an inner surface completely surrounding the bolt 5.
• This surface has two cooperation elements 24 positioned with On either side of the threaded rod 3.
• each of these two cooperation elements is positioned symmetrically in the holes of the bolt 5, exactly at the same level of a similar light.
• the two elements of cooperation of the element of actuation 30 move simultaneously and symmetrically within a lumen of the bolt 5, similar to the movement of the end 24 of the pawl 4 as explained above.
• This alternative embodiment has the advantage of greater stability and better transmission of the force of the pawl 4 to the bolt 5 through two complementary cooperation elements.
• the cooperation elements 24 are held at the bottom of the bolt slots 5 by an elastic blade 23 of the actuating element 30.
• the actuating element could comprise more than two elements of cooperation.
• the actuating element could comprise an elastic lamellar spring, similar to the lamella 35, to promote the backward return of the cooperation elements 24 during the ascent of the lever, in addition to the simple spring effect exerted by the lever.
• the bolt control means in this fourth embodiment is simply a pawl, possibly with a particular actuating element at its lower end.
• Figures 20 and 21 show a non-return device according to a first embodiment for an ejection device according to the invention, whose function is to prevent the rotation of the bolt 5 of the ejection device in the opposite direction to that allowing the ejection of the product.
• the pawl 4 connected to the lever 1 acting on the rack arranged on the periphery of the bolt 5.
• the ratchet 4 comprises a tooth 14 towards its end which acts on a tooth 8 of the bolt 5, as explained with reference to FIG. 3.
• the body of the ejection device comprises a non-return pawl 41, made in the form of a plastic elastic blade obtained during the molding of the body of the device.
• this rotation could be caused either by the friction of the pawl 4 on the bolt 5 of the lift of the lever 1, or by the residual pressure of the product to be ejected.
• the non-return pawl 41 thus fulfills a safety function and ensures that the next pressure of the lever 1 will allow a further controlled advance of the threaded rod, the desired distance, to obtain the right dose of ejected product.
• This embodiment of the non-return ratchet has been described in association with the first variant of the first embodiment of the ejection device according to the invention. However, it remains naturally compatible with all the other embodiments of the ejection device described above.
• Figures 22 to 27 show a second embodiment of a non-return device for an ejection device according to the invention.
• Such a non-return device is based on a cylindrical component 42 arranged at the central bore of the rear portion 2b, separate or integrated therein, in which the threaded rod 3, comprising teeth 43 on a its ends, which cooperate with complementary teeth 34 extending in the longitudinal direction of the bolt 5.
• These teeth 34, 43 have an asymmetrical shape that allows the rotation of the bolt 5 in the only direction of ejection of the product and prevents its rotation in the opposite direction.
• the limit switch of the lever 1 corresponds to the phase where the tips of the teeth 34 of the bolt 5 escape the teeth 43 of the anti-return device, and again marry the contact of the following teeth, the bolt 5 returning to its initial position in the direction longitudinal.
• This final phase at the moment of the end of movement of the lever 1, is thus accompanied by an audible click, indicating as in the previous embodiment the end of the ejection of the dose of product corresponding to actuation of the lever.
• the bolt 5 comprises on its second longitudinal end, opposite its toothed end 34, an elastic blade 35 which cooperates with a fixed portion 36 arranged in the central zone of the body of the ejection device.
• This elastic strip 35 has for function of returning the bolt to its nominal position in the longitudinal direction in contact with the non-return device. It is pressed against the fixed part 36 of the device when the bolt deviates from its initial position, which generates an elastic force favoring the return of the bolt in the corresponding teeth 43 of the anti-return device at the end of the actuation phase of the the sink.
• this slight longitudinal displacement of the bolt 5 towards the front of the ejection device during the actuation of the lever tends to act on the threaded rod 3 in the direction tending to increase the pressure on the product to eject.
• this effect induces an additional force promoting the ejection of the product, which is particularly useful in the case of a particularly pasty product.
• this slight longitudinal displacement of the bolt 5 obviously has no influence on the ejected final dose which depends only on the displacement of the threaded rod between its two initial and final positions within the ejection device at the beginning and at the end of actuation of the lever, while the bolt occupies the same longitudinal position in these two extreme positions of the lever.
• this displacement of the bolt can be damped and compensated by the dimensions and the elasticity of the front piston 16.
• FIG. 1 1 to 13 show the implementation of this embodiment on the second embodiment of the invention, with a slight variation in that the teeth 43 of the non-return device cooperate with an elastic blade of which the end forms a tooth of the bolt 5.
• the invention is not limited to the embodiments described by way of examples. Other implementations of the concept of the invention can be imagined from the combination of the preceding embodiments or by equivalent characteristics.
• the means for controlling the threaded rod from the lever can be obtained differently, by a ratchet of totally different shape, not necessarily in the form of a single piece in the form of a rod, and / or the teeth used for the different embodiments may have different geometries and / or orientations, there may be a multitude of gears of various shapes, the bolt may have any other shape, etc.
• the bolt and threaded rod push mechanism can be obtained by a plastic injection process, making it possible to easily and recyclably manufacture the majority of the elements of the ejection device.
• the body of the ejection device may have other geometries.
• the lever is manipulated so as to cause the passage of several teeth and sound clicks, that is to say the ejection of several minimum doses, in a single operation.
• its actuation could then be partial, not necessarily over its entire possible range of rotation, while operating according to the principle explained above.

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