DE8630071U1 - Dosing pen - Google Patents

Description

The aim is to use a location-independent handset to dispense reproducible doses in adjustable quantities from approx. 2μl to approx. 1Ωμl. A comparable device is not currently available.

2.2 Concept

A standard 2ml syringe is inserted into a corresponding holder on the handset. With a finger stroke - using a suitable device - the syringe plunger is pressed in as far as it corresponds to the respective setting.

2.3 Implementation

The piston of the syringe (B) is moved by a threaded spindle (H) towards the base of the syringe via a thrust piece (F), whereby the dosing material is dispensed at the dosing tip (K). The spindle (H) is driven by pressing down the actuating lever (C) via the downstream stepping mechanism (E). The mechanical stepping mechanism allows the desired number of steps per actuation to be set.

Steinhagen DOS1/DO1

Sheet 06

3.1 Step switch (E)

The stepping mechanism (E) consists of:

- Housing

- Adjustment wheel

- Step wheel

- Cable drum (Q) with drive pawl (N)

- Front brake disc with brake k 1 inks

- Rear flange

- Control shaft with cam disc

The drive pawl is moved by the operating lever (C) via a cable (L), engages the step wheel on the threaded spindle (H) and turns it by 1 to 5 steps according to the cam disc position. The brake pawl prevents the step wheel from turning back when the drive pawl automatically returns. However, the targeted design of the angle adjustment of the components to each other allows the step wheel to turn back by 1/2 step. This measure relaxes the system and prevents dripping at the dosing tip.

3.2 Thrust piece (F)

The thrust piece (F) consists of:

- Guide bush

- Thrust angle

The guide bush slides on the threaded spindle (H). The thrust angle is at the front edge of the guide bush

Steinhagen D0S1/D01 Sheet 07

_&Ggr; —mdash;_. .

can be pivoted upwards. This means that the downwardly open thrust nut on the back of the thrust angle can be pivoted out of the thread of the threaded spindle (H). The thrust piece (F) can therefore be moved freely along the threaded spindle (H).

3.3 Threaded spindle (H)

The threaded spindle (H) has a thread-free recess at a sufficient distance in front of the counter bearing (M) which prevents the thrust piece (F) from running against the counter bearing (M).

Steinhagen DOS1/DO1 sheet

Dosing material quantity control]_" Edition A

^mm3

The following parameters are included in the calculation:

- Volume per mm piston stroke = 60 mm = VI

- Pitch of the spindle (H) = 0.7mm = S

- Number of steps of the step wheel = 24 = &eegr;

This results in a volume per step

60mm ³ · 0.7mm
mm · 2~4"

V=._!i

The quantity setting allows the delivery of the following

Quantities: 1 step = 1.75 ul = quantity for thread M2

2 steps= 3.5 μδ = -"- M2.5

3 steps= 5.25 μδ = -"- M3

4 steps= 7,γ μδ = -"- M4

5 steps= 8.75 μδ = -"- M5

A reproducibility of +/- 5% was determined for the quantities dispensed.

te'nhagen D0S1/D01 sheet

5. Application

The DOS1 dosing pen is a tool for dosing liquids with low viscosity.

DOS1 was specially developed for the reproducible dispensing of screw locking adhesive (Loctite). It can also be used for: -oil/ -low viscosity adhesive/ - screw locking varnish.

Basically, two possible applications are conceivable. Possibility 1 : The dosing pen is on the base (0).

One hand brings the part to be dosed to the dosing tip (K), the other hand operates the lever (C). The drop emerging from the dosing tip (K) is deposited on the part to be wetted.

Option 2

The dosing pen is taken in the hand, the lever (C) is pressed down with the index finger of the same hand and the dosing material can be brought to the application site and placed there.

When not in use, the dosing pen can be placed flat on the storage surface (P) of the base (0), where a built-in magnet ensures a secure hold.

Steinhagen

D0S1/D01

Sheet 10

If the syringe (B) is empty, it can simply be removed from the dosing pen and refilled. Before inserting, the pusher (F) must be pushed back as far as it will go (to do this, swing the pusher angle upwards). After inserting, push the pusher (F) against the syringe plunger. The operating lever must now be operated approximately 5 times in position 5 of the adjusting wheel (D) until a force connection is established between the pusher (F) and the syringe plunger.

Steinhagen DOS1/DO

_Sheet

6. Advantages of

Issue_A

Compared to the method used up to now (distributing the dosing material with a stick from open containers) there are the following advantages:

- adjustable quantities that can be specified in the user's drawing set, which leads to the reproducible quality of their products

- reproducible quantities

- the system is contamination-free, which is particularly important when dispensing screw locking adhesive (Loctite)

- the dosing material is maximally protected from contamination in the dosing pen

- the dosing material can be safely brought to the application site without prior dripping

- most economical application is guaranteed

- time-saving use through constant operational readiness

In addition, the dosing pen

- handy

- safe to handle

- location independent

- reliable

- maintenance-free

Steinhagen DOS1/DO1 sheet

Claims (4)

Applicant: Hans Steinhagen Alte Owinger Straße 64 7770 Überlingen Official designation: "Hand-operated dosing device with stepping mechanism" Claims: 1. Hand-operated dosing device with a stepping mechanism for dispensing precisely specified amounts of liquid in constant portions from a storage container, with a piston that can be pressed into the storage container by means of a threaded spindle with a specified stroke for ejecting a quantity of liquid resulting from the advance of the piston and the cross-section of the storage container, whereby the pitch of the thread and the angle of rotation of the threaded spindle determine the advance of the piston, characterized in that a commercially available disposable syringe (B) with a piston can be used as the storage container (B), which can be inserted into the base frame of a dosing device, that a threaded spindle (H) driven by a stepping mechanism (E) is provided parallel to the piston, whereby a thrust piece (F) movable on the threaded spindle (H) acts on the piston and that the stepping mechanism (E) is actuated by means of a rocker-shaped operating lever (G). 2. Dosing device according to claim 1, characterized in that a finger-operable The actuating lever (G) has an actuating plate (C), the opposite end of which is in engagement with a cable (L) which can actuate the stepping mechanism (E), and the angle of rotation of the threaded spindle (H) on the stepping mechanism (E), which angle can be controlled via the stepping mechanism (L), can be adjusted in several stages. 3. Dosing device according to claim 1 or 2, characterized in that the stepping mechanism (E) has a drive mechanism (N, Q) which can be actuated via the cable (L), by means of which the threaded spindle (H) of the dex. dosing device can be driven and that the stepping mechanism (E) has a braking mechanism when the load is released and the stepping mechanism is reset. 4. Dosing device according to claim 3, characterized in that the braking mechanism of the step switch (3) ensures a return of the threaded spindle by 1/2 step.