WO1994022390A1 - Dentist's centrifuge having movable trays - Google Patents

Dentist's centrifuge having movable trays Download PDF

Info

Publication number
WO1994022390A1
WO1994022390A1 PCT/FR1994/000375 FR9400375W WO9422390A1 WO 1994022390 A1 WO1994022390 A1 WO 1994022390A1 FR 9400375 W FR9400375 W FR 9400375W WO 9422390 A1 WO9422390 A1 WO 9422390A1
Authority
WO
WIPO (PCT)
Prior art keywords
swings
base
bell
centrifuge
characterized
Prior art date
Application number
PCT/FR1994/000375
Other languages
French (fr)
Inventor
Pierre Berceaux
Original Assignee
Pierre Berceaux
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR93/04055 priority Critical
Priority to FR9304055A priority patent/FR2703582B1/en
Application filed by Pierre Berceaux filed Critical Pierre Berceaux
Publication of WO1994022390A1 publication Critical patent/WO1994022390A1/en

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/20Methods or devices for soldering, casting, moulding or melting

Abstract

The tray holders consist of cross-pieces (21) with support arms (42) which are provided with hooks (41), staggered and angularly offset through 180° on a drive shaft (15) driven by a motor (11, 12) arranged in a base (10) supporting a removable hood (20) for enclosing the assembly and guiding the end of the shaft (15) by means of a roller bearing (24) in the upper hood portion (23). Safety devices prevent operation while the hood (20) is not in position and prevent said hood from being removed until the centrifuge has come to a complete stop.

Description

Centrifuge with mobile racks piuil _l___ll d e nta i re.

The invention relates to centrifuges used in dentistry, for molding dental impressions, producing refractory lining as well as for removing molten wax. The invention takes into account security concerns.

Currently, in dentistry, to cast the impression models, two methods are used, the first consists in tapping them or subjecting them to vibrations, the second consists in using a centrifuge with support of the type of those described in US patents 3,692,236, 1,658,084 and 1,502,435, not allowing more than two models to be cast, the swings used being fixed.

The first method does not make it possible to obtain a very homogeneous material by default of compactness and inclusion of air bubbles which is common.

The second method makes it possible to obtain a homogeneous material and the elimination of air bubbles; however, the use of two fixed swings reduces the use of centrifuges for specific materials and delicate models; more this method is demanding by its small flow. There is already known a centrifuge with mobile swings for dentistry corresponding to the preamble of claim 1 (US Patent 3,860,166), its rotor is provided at its periphery with a number of regularly distributed hooks to which swings are attached. cylindrical intended to receive the impressions and to collect possibly the hot wax. However, with such a device, large imbalances can appear as a result of an unbalanced distribution of the swings used. In addition, the swings are small and their number is limited to a single row.

The object of the present invention is to remedy these drawbacks. This invention, as characterized in the claims, solves the problem of creating a centrifuge with articulated swings with which, on the one hand, the distribution of the swings can be directly balanced according to the load and, on the other apart, a wide range of centrifugation speed can be covered without risk of unbalance or vibrations.

The advantages obtained, thanks to this invention, consist essentially in this, that the preparation, the distribution and the balance of the swings, can be carried out outside the machine, that is to say, in masked time. The tiered arrangement, in groups of two swings, allows great flexibility of adaptation and a high production rate, depending on the swings available.

The swings can be centrifuged in two and a half minutes, plus one minute of inertia force, for a series of six swings filled per operation. The same operation can make it possible to carry out refractory material of wax models or else to remove the wax after preheating this in order to eliminate any slag in the metal flows. The peculiarity of this invention consists in that the system comprises, on the one hand, a support base in steel cast iron which, by its weight, ensures the stability of the device and, on the other hand, a covering bell which protects the whole. It offers the possibility of loading the swings on stepped braces fixed on the drive shaft. To allow the work of the imprints, the swings are removable without this causing discomfort for the preparation of said imprints.

The problem of safety has been studied, so that starting and stopping cannot be done without several conditions being met; start-up is carried out via a contactor connected to a timer; an indicator light indicates the operating condition.

The bell is provided with three lugs which allow it to be locked on the base and serve as a guide for its installation; in the base, electric pulsers place fingers in cavities made in these pins. This safety is coupled with an electromagnet system, so that the separation of the bell from the base can only take place after the rotation of the carrier shaft has stopped completely.

Security was thus ensured electrically. The start-up can only be carried out if the bell is in place and it can only be removed after the rotation of the shaft has stopped completely. The drive shaft rests on a thrust bearing resting on the bottom of the base, while its upper end engages in a bearing located at the top and in the center of the bell. The unbalance effect is control. The rotor of the drive motor is connected directly to the drive shaft; maximum efficiency was thus obtained under a minimum footprint.

Other characteristics and advantages will appear in the following description of a centrifuge with articulated swings for dentistry according to the invention, given by way of nonlimiting example, with regard to the drawings in which:

FIG. 1 represents a front view in longitudinal section of the centrifuge, with indication, in phantom, of the extreme position of a swing,

FIG. 2 represents a top view of the interior of the apparatus, with the drive shaft equipped with four swings distributed over two levels,

FIG. 3 represents a schematic top view of the cover bell of the device,

FIG. 4 represents a top view of the interior of the base,

FIG. 5 represents a lug for fixing the bell,

FIG. 6 represents the safety electromagnet,

FIG. 7 represents a pusher, FIG. 8 represents the drive shaft,

FIG. 9 represents a side view of a swing,

FIG. 10 represents the front view of a swing,

FIG. 11 represents a top view of a swing,

FIG. 12 represents a top view of the swing support assembly equipped with two swings,

FIG. 13 represents a side view, in section, of the device for fixing the swings on their support,

FIG. 14 represents a front view, in longitudinal section, of the device for balancing the swings on their support,

FIG. 15 represents a top view of the balancing device according to FIG. 14.

The figures represent a centrifuge of mobile swings topped with a cover bell.

In Figure 1, representing the assembly, we note, at the base, a base 10 in which there is a motor consisting of a stator 11 and a rotor 12 supplied with electric current by a contactor 13; a timer 14 regulates the drive time of a drive shaft 15 which is mounted directly on the rotor 12; an indicator light 16 ensures the control of the correct electrical operation; a thrust bearing 18 supports the drive shaft 15; a pusher 34 electrically actuated, keeps the bell 20 in position until the rotor 12 comes to a complete stop; the bell 20 covers the entire device. The drive shaft 15 carries crossbars 21 with support arms 42 of swings 22. The upper end of the drive shaft 15 is housed in a bearing 24 located at the top and in the middle of the upper part 23 of the bell 20. A set of handles 25 allows the manipulation of the bell 20; the lug 26 allows the bell 20 to be placed on the cover 27 of the base 10.

In FIG. 2, the arrangement of two stages of swings 22 can be seen distributed around the drive shaft 15 situated inside and in the center of the covering bell 20.

In Figure 3, there is the cover 27, which covers the base 10, with, in its center, the drive shaft 15 driven by the rotor 12 of the motor; at 28 the fasteners of the cover 27 on the base 10; the passage of the pusher system 34 allowing the locking of the lugs 26 which join together the elements 10 and 20 which cannot, therefore, be separated. During the rotation of the rotor 12, the electromagnets 29 maintain and reinforce the security of the bell device 20 and base 10 in superposition.

In FIG. 4, we note, at 30, the location of the thrust bearing 18 of the drive shaft 15 supporting the rotor 12, which is driven by the stator 11 of the electric motor, and the location of the electro- magnets 29, two in number, as well as the parts 19 locking the entire device, at 28 the system for fixing the cover 27 on the base 10. In Figure 5, there are the pins 26 located on the base of the bell 20; three in number, they lock onto the parts 19 by means of the cavity 32 and the finger of the pusher 34 actuated by an electromagnet 29.

In FIG. 6, there are two electromagnets 29, which are housed in the base 10 and whose part 33 is housed in the cover 27 flush with its complement situated on the edge of the bell 20.

In FIG. 7, we notice the pusher 34 which is housed in the part 19 and whose finger is inserted into the cavity 32 of the lug 26 under the action of the electromagnet 29.

In Figure 8, there is the drive shaft 15, the upper end 35 is housed in the bearing 24 located in the middle of the bell 20; the passage orifice 36 of the crossbars 21 supporting the arms 42 carrier 22 with a bore 31 for securing by a pin; location 37 of the attachment of the rotor 12 of the electric motor.

It is also noted that the passage openings 36 of two successive cross-pieces 21 are arranged at 180 ° from one another.

In FIG. 9, the swing 22 is noted having longitudinal edges 38 and trapezoidal lateral edges 39, and the pins 40 serving for fixing and articulation of the swing 22 in the hooks 41 of the support arms 42 of swing 22 . In FIG. 10, the swing 22 is noted, with longitudinal edges 38 and lateral trapezoidal edges 39, as well as the axes 40 for swing supports 22.

In FIG. 11, the swing 22 is noted, with longitudinal edges 38 and lateral trapezoidal edges 39 with support axes 40.

In FIG. 12, we see at 42 the support arms for swings 22 fixed to the ends of a cross 21.

In Figure 13, there is a support arm 42 with hooks 41 for the insertion of an axis 40 of swings 22; said hooks 41 being equipped with a latch 46 permanently returned against the hook spout 41 by a spring 47. This device prevents any play of the pin 40 in the bottom of the hooks 41, while allowing rotation. The bottom of the notch of the hook 41 marries, for that. The shape and the dimensions of the axes 40 for fixing the swings 22; this ensures a horizontal plane to the moldings obtained. The installation and removal of the swings 22 is easy.

In Figure 14, we note the balancing system 48 of the swings 22, it comprises a base 52 on which are fixed two support bearings 49 in which are mounted the bearings 50 fitted to the axes 43 which have been fixed to the exterior of the support arms 42 in the axis of a cross 21: a cross set 21 and support arm 42 having been reserved for this exclusive use.

In FIG. 15, it can be seen that the loaded swings 22 can thus be balanced two by two before their mounting, on the same floor, on the balancer. This balancing set 48 of the swings 22, uses cross-pieces 21 with support arms 42 devoid of their safety catch 46 with spring 47, which is of no interest in this particular case of use.

The release of the bell 20 after the complete immobilization of the drive shaft 15 of the swings 22 is obtained by means of the combination of a rotary sensor and a contactor relay; a timed contactor relay; a detector for reducing the electric current supplied to zero by the rotor 11 of the electric motor, when the latter operates as a generator after its electrical supply has been cut off, or by any other equivalent combination of means.

Claims

Re Y en lic_atlojrjLS_
1. Centrifuge with mobile swings for dentistry comprising a cylindrical base inside which is fixed the drive motor of a vertical shaft provided with swings supports which it drives in rotation under the control of a timer , characterized in that the swing supports consist of crosspieces (21) with support arms (42) with hooks (41) stages and offset angularly and successively by 180 ° relative to each other and vertically according to a interval allowing free lateral movement of the swings (22), in that the base (10) supports a removable cover bell (20) comprising, at its upper part (23) and in its center, a bearing (24) intended to receive the upper end (35) of the drive shaft (15) of the swings (22) and in that the upper face of the base (10) and the base of the bell (2O) are equipped with devices ensuring the momentary locking of the assembly and energizing the timer (14) for controlling the electric motor (11, 12) and preventing disassembly of the bell (20) from the base (10) before the drive shaft (15) comes to a complete stop ) swings (22).
2. Centrifuge with swings according to claim 1, characterized in that the swings (22) are fixed two by two on the support arms (42) of the same spider (21) by means of two trapezoidal vertical flanges ( 39) arranged vis-a-vis on two of the opposite sides of the swing (22) comprising, near the top, a perpendicular hinge pin (40) directed towards the outside of the swing (22), located in the longitudinal median plane of this.
3. Centrifuge with swings according to claim 1, characterized in that the axes (40), of articulation and fixing of the swings (22), are retained in the hooks (41) of the support arms (42) by the intermediate a sliding latch (46), with bevelled end, normally biased against the hook beak (41) by a spring (47).
4. Centrifuge with swings according to claim 1, characterized in that the locking of the bell (20) on the base (10) is obtained by means of lugs (26) with radial cavity (32) fixed to the base of the bell in which engages the finger of a pusher (34) with displacement controlled by an electromagnet (29) controlled by the timer (14) and by the safety device preventing the dismantling of the bell (20 ) before the drive shafts (15) of the swings (22) stop completely.
5. centrifugal centrifuge according to claim 1, characterized in that the device controlling the energization of the timer (14) for controlling the electric motor, consists of a contactor controlled by one of the lugs (26) of fixing of the bell (20) by the pressure exerted on said contactor during the fixing of said bell (20) on the base (10) during the g ag e me nt co m pl and dud it e rgot (26) .
6. Centrifuge with swings according to claim 1, characterized in that the safety device prohibiting disassembly of the bell (20) of the base (10) before the complete stop of the shaft (15) driving the swings ( 22), consists of a time relay keeping the bell locking device (20) on the base (10) energized, after switching off the drive motor (11, 12) of the shaft (15 ), for a time corresponding to that which is necessary to obtain the total stop of the tree (1 5).
7. Balance for balancing the swings of the centrifuge according to claims 1 to 7 taken as a whole, characterized in that it consists of a spider (21) which has been extended beyond the support arms (42) by axes (43) fitted with bearings (50), ball or needle, mounted in support bearings (49) fixed on a base (52) of appropriate dimensions.
8. Balancing balance according to claim 7, characterized in that the hooks (41) of the support arms (42) of the spider (21) are devoid of their safety latch (46) spring (47).
PCT/FR1994/000375 1993-04-06 1994-04-05 Dentist's centrifuge having movable trays WO1994022390A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR93/04055 1993-04-06
FR9304055A FR2703582B1 (en) 1993-04-06 1993-04-06 Centrifuge the removable bell dentistry.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19940912586 EP0652732A1 (en) 1993-04-06 1994-04-05 Dentist's centrifuge having movable trays

Publications (1)

Publication Number Publication Date
WO1994022390A1 true WO1994022390A1 (en) 1994-10-13

Family

ID=9445799

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1994/000375 WO1994022390A1 (en) 1993-04-06 1994-04-05 Dentist's centrifuge having movable trays

Country Status (3)

Country Link
EP (1) EP0652732A1 (en)
FR (1) FR2703582B1 (en)
WO (1) WO1994022390A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658084A (en) * 1925-06-25 1928-02-07 Hudson Alden Pattern elimination for molds
FR940287A (en) * 1947-01-22 1948-12-08 Flow centrifugal machine for dentists and similar
US3844702A (en) * 1972-12-04 1974-10-29 Nobilium Prod Inc Centrifugal casting and curing apparatus
US3860166A (en) * 1972-04-18 1975-01-14 Anderson Lab Inc Apparatus for separating moisture from solids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658084A (en) * 1925-06-25 1928-02-07 Hudson Alden Pattern elimination for molds
FR940287A (en) * 1947-01-22 1948-12-08 Flow centrifugal machine for dentists and similar
US3860166A (en) * 1972-04-18 1975-01-14 Anderson Lab Inc Apparatus for separating moisture from solids
US3844702A (en) * 1972-12-04 1974-10-29 Nobilium Prod Inc Centrifugal casting and curing apparatus

Also Published As

Publication number Publication date
EP0652732A1 (en) 1995-05-17
FR2703582B1 (en) 1995-06-23
FR2703582A1 (en) 1994-10-14

Similar Documents

Publication Publication Date Title
US3420437A (en) Cell washing centrifuge
KR100435264B1 (en) Automatic Multi-Decanting Centrifuge
KR910006182B1 (en) Method of and apparatus for casting
JP2574126B2 (en) Sample centrifugation processing method and apparatus
DK9500262U4 (en) Base frame for vindmøllehus and wind turbine comprising the same
US4196231A (en) Impregnating equipment and method of vacuum impregnation
US4439177A (en) Rotor bucket liner
DE102004014542B4 (en) Device for manufacturing core packages
US4368748A (en) Device for degreasing, tumbling and washing of industrially manufactured objects
US20040253109A1 (en) Method for in situ construction of a wind power plant
SK4862001A3 (en) Rotational casting method and apparatus for making the same
US5614030A (en) Method of cleaning a shaving head of a dry shaving apparatus
JPH02175388A (en) Door assembling device
WO2002053292A2 (en) Centrifuge comprising a blood bag system with an upper and lower outlet
US5997947A (en) Rotisserie fixture for coating airfoils
EP0038842B1 (en) Decanting centrifuge
EP1877212B1 (en) Method for producing a multitude of components made of, in particular, titanium aluminide, and device for carrying out this method
GB2181374A (en) Support fixture for turbine blades
US4041648A (en) Tumbling and polishing machine with planetary rotating drums
EP0114743A2 (en) Supply apparatus for automatic weighing system
NZ247033A (en) Drive for spin washer: agitator shaft bearings are motor rotor bearings
EP1733869B1 (en) Improved machine for assembling and vulcanizing tires
WO2004092699A1 (en) Unbalance measuring device and method for unbalance measurement
US2448640A (en) Wax caster
GB2231095B (en) Balance weight for turbine rotors

Legal Events

Date Code Title Description
AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

AK Designated states

Kind code of ref document: A1

Designated state(s): BR CZ JP US

WWE Wipo information: entry into national phase

Ref document number: 1994912586

Country of ref document: EP

ENP Entry into the national phase in:

Ref country code: US

Ref document number: 1994 351237

Date of ref document: 19941202

Kind code of ref document: A

Format of ref document f/p: F

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWP Wipo information: published in national office

Ref document number: 1994912586

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1994912586

Country of ref document: EP