US 3785757 A
The blade joint structure disclosed, to be used in pumps, blowers, hydrometers, and the like machines, comprises a pair of spaced blades mounted on the ends of a rod extending diametrically through the rotor of machines of the type referred to. The joint structure is such that the blades have at least two degrees of freedom provided by a blade having a bore in which a clamping means is inserted which itself has a bore at right angles for receiving the end of the rod. The rotor is provided with a slot or bore through which the mounting rod extends and in which it is movable. In the illustrated embodiment the means for securing the clamping means to the rod includes a bolt carried by the clamp.
Description (OCR text may contain errors)
Elite Stamm States Patent [1 BLADE JOINT  Inventor: David Paul Stamm,
Hendrik-I do-Ambacht, Netherlands  Assignee: Conoflow Europa N.V., Dordrecht,
Netherlands  Filed: Oct. 22, 1971  Appl. No.: 191,918
 Foreign Application Priority Data S/I928 Gurley 418/255 Caskey 418/255 Fraser 418/255 Primary Examiner-C. J. Husar  ABSTRACT The blade joint structure disclosed, to be used in pumps, blowers, hydrometers, and the like machines, comprises a pair of spaced blades mounted on the ends of a rod extending diametrically through the rotor of machinesof the type referred to. The joint structure is such that the blades have at least two degrees of freedom provided by a blade having a bore in which a clamping means is inserted which itself has a bore at right angles for receiving the end of the rod. The rotor is provided with a slot or bore through which the mounting rod extends and in which it is movable. In the illustrated embodiment the means for securing the clamping means to the rod includes a bolt carried by the clamp.
6 Claims, 4 Drawing Figures PATENTEDJAH l 5 HT! FIG.2
BLADE JOINT The present invention relates to a joint of two diametrically opposite blades tobe used in pumps, hydrometers similar machines.
As is known in a vacuum pump two diametrically opposite blocks are pressed from each other by means of springs against the wall of the pump housing. Further in hydrometers blades are used, of which the diametrically positioned blocks are rigidly connected by two rods. The constructions used in vacuum pumps, however, cannot be used in hydrometers, as by spring force and centrifugal force too much friction is caused, owing to which measuring faults appear.
However, the construction applied in hydrometers, which construction comprises two rigid rods, has several, disadvantages. Both the rotor and the blades should be manufacturered very precisely, and the slots which are necessary in the rotor should be provided very exactly parallel to the centerline. Further the blades should be manufactured with a very precise gauge, viz. symmetrical with respect to the two rods, which rods should also be parallel with respect to one another. All this is very expensive. Further there is another important objection, i.e., that the blade blocks cannot follow deviations, if any, of the meter house, so that no optimum working of the meter is obtained. As further the rods serve as coupling rods and slide through stuffing boxes which means that there should be two passages which, on their turn,'may cause leakage and friction. Finally the metal rods in the blade blocks, which are usually made of a light material, form an extra weight, which is disadvantageous in view of the appearing accelerating forces.
In order to remove the abovementioned disadvantages according to the present invention a joint-is proposed, which is characterized in that the joint means comprises a movable rod, the ends of which are clamped within a clamping means in the blades. I
The invention will be further elucidated from the description and enclosed drawings, in which:
FIG. 1 represents a hydrometer provided with a pair of blades mounted on a rod according to the present invention;
FIG. 2 represents rod;
FIG. 3 is a side view of the pair of blades represented in FIG. 2;
FIG; 4 is a section through the clamping means for fixing the joining rod to a blade, taken along the line IV--IV in FIG. 2.
In FIG. I the pump housing of a hydrometer is schematically represented, said housing enclosing a rotor I and two diametrically opposite blades 2, which are rigidly interconnected by means of a rod 3, which rod is guided through the a bore or slot 4 in the rotor 1.
In FIG. 2 the joint of the blades is represented more detailed. Each blade has a bore in which the clamping means 5 is inserted. Further each clamping means 5 is provided with a bore 6 perpendicular to the firstmentioned bore, intowhich the rod 3 passes. The ends of the rod are positioned in the respective bores 6 of the clamping means. By tightening the bolt 7 the end of the rod is clamped within the clamping means. Owing to the fact that the bore through which the rod passes is larger than the diameter of the rod, a rotating movement over some degrees of the rod with respect to the the pair of blades joined by a single blades or blocks in the flat surface is possible. Also a movement perpendicular to the said surface of some tenths of millimetres is possible.
The present construction has several advantages. For, the blade blocks can be directed to the surface along which they are moving. As further the ends of the rod are clamped in circular fittings, it is no objection that the diametrically positioned slots in the rotor form .a small angle, as the blade blocks are fixed in the rotor and, consequently, are in the right position. When the blocks are diametrically-worn out,the clamping means can be released for a moment, whereafter the blade blocks are pushed outwardly and thereafter are clamped again. Further this construction has the advantage that in spite of the adjustability the pair of blades can be dismantled and mounted again during which the adjusted measure is re-established. This is obtained by providing a clamping means with a stop pin 8. Upon adjustement the rod is firstly pushed into the clamping means against said stop means and thereafter the clamping screw 7 is fixed. Thereafter the second block is pushed on'the rod and clamped at the right place by means of a jig. When it is necessary to dismantle the clamping means is released with the adjusting pin. In this way the blade can be dismantled without the adjusting measure being lost. Finally it will be clear that owing to the fact that there is no second rod the already mentioned mass and friction are halved.
What is claimed is:
l. A machine of the type including pumps, blowers, hydrometers or the like, said machine comprising a housing, a rotor mounted in the housing and a blade joint carried by .the rotor, the blade joint comprising a single rod extending through a slotin the rotor, two diametrically opposed blades-each provided with a bore and located at the ends of the rod, means for securing the blades to the ends of the rod, each of said securing means including a clamping means for clamping said rod, and said clamping means being rotatably mounted in said bore, for permitting relative movement between the blade and the clamping means during operation of the rotor.
2. A machine as claimed in claim 1 in which said blades each have a second bore therein communicating with said first mentioned bore, said rod passes through said second bores in said blades, and the diameter of said second bores is greater than the diameter of said rod.
3. A machine as claimed in claim 2 in which said second bore is at a right angle to said first mentioned bore.
4. A blade joint structure for the rotors of pumps, blowers, hydrometers or the like machines, comprising a single rod adapted to extend through a slot in the rotor, two diametrically opposed blades respectively located at and secured to the ends of the rod, a clamping means located in each blade for receiving an end portion of the rod and for connecting the blade and the rod to each other, each said blade having a bore therein, and each said clamping means being rotatably mounted in the bore of its respective blade, for permitting relative movement between the blade and the clamping means during operation of the rotor.
5. A blade joint structure as claimed in claim 4 in which said blades each have a second bore therein communicating with said first mentioned bore, said rod passes through said second bores in said blades, and the diameter of said second bores is greater than the diammentioned bore and wherein one of the clamping eter of said rod. means includes a stop for the end of the rod received 6. A blade joint structure as claimed in claim 5 in therein. which said second bore is at a right angle to said first UNITED .STATES I PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,785,757 K Dated January 15.. 1974 Q Inventor(s) David Paul Stanim It is certified that error appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below:
Column 1, line 9 reads "used, of which" Should read used, for which Column 2, line 1 reads "'blades or blocks" Should read blades or biade blocks-- Signed and sealed this 6th day. of August 197 (SEAL) Attest:
MCCOY M. GIBSON, JR. c. MARSHALL DANN Attesting Officer v Commissioner of Patents