Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
328 words
A dosage unit for a number of measured quantities of a liquid, where the dosage unit comprises a cylindrical casing (1) for the dose of the liquid in question, said liquid preferably being present in a separate cartridge (2), the distal end of said casing being provided with means for fastening a liquid outlet needle (5), said dosage unit further comprising a piston rod (8) affecting a piston (4) forcing out the liquid and situated in the cartridge and an adjustment means (18) pivotally mounted on the casing and determining by way of adjustment the length of stroke of the piston rod (8) relative to a measuring scale (39, 40) indicating the desired quantity, and where the dosage unit in addition comprises a ratchet device (10, 11) situated between the casing (1) and the piston rod (8) and allowing displacement of said piston rod (8) towards the distal end of the casing and preventing a displacement thereof in the opposite direction, characterised in that the adjustment means (18) is non-displaceably mounted on the casing (1), that the piston rod (8) is provided with an external thread (12) and prevented from rotating relative to the casing (1), that a nut means (13) is provided between the piston rod (8) and the adjustment means (18), said nut means engaging by way of an internal thread the thread of the piston rod (8) and on the outside engaging in an axially displaceable manner the adjustment means (18) such that rotation of the adjustment means (18) involves a rotation of the nut means relative to the piston rod (8), and that the nut means (13) is connected to an indicator (21) protruding from the end of the adjustment means (18) said indicator comprising means stopping its axial movement towards the distal end of the dosage unit and further comprising a measuring scale (39) indicating the extent of its axial displacement relative to the adjustment means (18) and consequently the desired dosing quantity.
Claim 2
Dependent Claim
328 words
A dosage unit for a number of measured quantities of a liquid, where the dosage unit comprises a cylindrical casing (1) for the dose of the liquid in question, said liquid preferably being present in a separate cartridge (2), the distal end of said casing being provided with means for fastening a liquid outlet needle (5), said dosage unit further comprising a piston rod (8) affecting a piston (4) forcing out the liquid and situated in the cartridge and an adjustment means (18) pivotally mounted on the casing and determining by way of adjustment the length of stroke of the piston rod (8) relative to a measuring scale (39, 40) indicating the desired quantity, and where the dosage unit in addition comprises a ratchet device (10, 11) situated between the casing (1) and the piston rod (8) and allowing displacement of said piston rod (8) towards the distal end of the casing and preventing a displacement thereof in the opposite direction, characterised in that the adjustment means (18) is non-displaceably mounted on the casing (1), that the piston rod (8) is provided with an external thread (12) and prevented from rotating relative to the casing (1), that a nut means (13) is provided between the piston rod (8) and the adjustment means (18), said nut means engaging by way of an internal thread the thread of the piston rod (8) and on the outside engaging in an axially displaceable manner the adjustment means (18) such that rotation of the adjustment means (18) involves a rotation of the nut means relative to the piston rod (8), and that the nut means (13) is connected to an indicator (21) protruding from the end of the adjustment means (18) said indicator comprising means stopping its axial movement towards the distal end of the dosage unit and further comprising a measuring scale (39) indicating the extent of its axial displacement relative to the adjustment means (18) and consequently the desired dosing quantity.
Claim 3
Dependent Claim
52 words
A dosage unit as claimed in claim 1, characterized in that the nut means (13) comprises at least one radially protruding, axially extending projection (14, 15, 41) on the outside, said projection being slidably situated in an associated axially extending groove (16, 17) in the inner side of the adjustment means (18)
Claim 4
Dependent Claim
38 words
A dosage unit as claimed in claim 1 or 2, characterized in that the nut means (13) and the associated indicator (21) comprise means (23) stopping their axial movement away from the distal end of the dosage unit.
Claim 5
Dependent Claim
25 words
A dosage unit as claimed in claim 1, 2 or 3, characterised in that the nut means (13) and the indicator (21) are integrally shaped.
Claim 6
Dependent Claim
47 words
A dosage unit as claimed in claim 4, characterised in that the nut means (13) and the indicator (21) are substantially axially symmetrically shaped with a button at the external end, the outer diameter of said button corresponding to the outer diameter of the adjustment means (18).
Claim 7
Dependent Claim
90 words
A dosage unit as claimed in claim 1, 2, 3, 4 or 5 and comprising a removable cap (25) protecting the needle (5), characterized in that the cap (25) is of such an axial extent that when mounted it abuts adjacent the distal end of the adjustment means (18), and that the abutting ends of the cap (25) and the adjustment means (18) have correlative measuring scale portions (37, 38, and 40) indicating the dosing quantity set during the rotation of the adjustment means (18) relative to the cap (25).
Claim 8
Dependent Claim
91 words
A dosage unit as claimed in claims 1-6, characterised in that marking means (31, 32, 33, 34, 35, and 36) are provided on the casing (1) and the adjustment means (18), said marking means allowing a stepwise turning of the adjustment means with a tangible and optionally audible indication of this movement, and that the cap (25) is arbitrarily and unturnably situated with the associated measuring scale portion situated opposite the measuring scale portion (37) of the adjustment means in any position thereof as a consequence of the stepwise turning thereof.
Claim 9
Dependent Claim
76 words
A dosage unit as claimed in claims 1-7, characterised in that the prevention of the piston rod (8) from rotating relative to the casing (1) is ensured by means of the ratchet device (10, 11), whereby at least one pawl (11) is provided on the casing (1), said pawl engaging a longitudinal groove (9) in the piston rod (8), where the bottom of the groove is provided with a suitable toothing co-operating with the pawl (11).