Mounting device for vibrating tables
US 3104868 A
Description (OCR text may contain errors)
Sept. 24, 1963 K. A. s. KARLSTROM ET AL MOUNTING DEVICE FOR VIBRATING TABLES 2 Sheets-Sheet 1 Filed Aug. 8, 1961 p 1963 i K. A. s. KARLSTRGM s-r'm. 3,104,868
MOUNTING DEVICE FOR VIBRATING TABLES Filed Aug. 8,- 1961 2 Sheets-Sheet 2 fiZZE 25 United States Patent MOUNTING DEVICE FG R VRRATING TABLES Karl Axel Sam Karlstriim, Gavle, and Karl Gustaf Gstberg, Rotebro, Sweden; Ingrid J. C. Allard and Elsie A. M. Gstberg, sole heirs of said Karl Gustaf fistberg, deceased, assignors to said Karlstriim Filed Aug. 8, 1961, Ser. No. 130,126 Claims priority, application Sweden Aug. 15, 1960 4 Claims. (Cl. 259-72) The present invention relates to such vibrating tables, especially intended for dental use, in which the vibrator is rigidly secured to the table so that its vibrations are transmitted to the table and through this to vibrating objects placed on the table. The invention has for its object to provide a device for mounting the vibrating table in a holder in such a way that the whole table may vibrate without the vibrations being damped appreciably by the connection with the holder. According to the invention, for this purpose the table is adapted to be secured to the holder by means of two mounting flanges extending from the table and forming a resilient clamp enclasping the holder. The mounting flanges are suitably made integral with the table which preferably con sists of a piece of resilient sheet plate whose opposite end portions are bent over angularly to the table so as to form resilient flanges enclasping the holder in a resilient grip. For placing the table on a base the holder is suitably formed as a block or the like of rubber or some other resilient material, the resiliency of the holder permitting the table to vibrate without being damped appreciably by the holder. In order to reduce the damping effect as far as possible, the mounting flanges are adapted to engage the holder at their" outermost ends only, the edges engaging two recesses in opposite end faces of the holder.
The invention is illustrated in the annexed drawings. FIG. 1 shows an embodiment of the vibrating table and the holder in perspective. FIG. 2 is an elevation and FIG. 3 is a top plan view of the table. FIGS. 4, 5 and 6 show another embodiment in top plan View, and elevation and longitudinal section, respectively.
The vibrating table comprises a rectangular resilient sheet plate 1, suitably of stainless steel, whose end portions 2, 3 are bent downwardly so as to form in unstressed condition approximately right angles with the plane surface of the table. The table is carried by a substantially parallel-epipedal block 4 of a resilient material, for instance rubber, by means of which the table may be placed in a horizontal position on a base. The table is connected to the block by the flanges 2, 3 forming together with the table-top a spring clamp enclasping the block, the flanges engaging grooves in the opposite end faces of the block with their inwardly bent edges 5, 6. The table is mounted on the block by being pushed down over the same, the edges 5 of the flanges first sliding against the bevelled top portions 7, 8 of the opposite end faces 9, 10 of the block and then along said end rfaces until the edges 5, 6 snap into the transverse grooves in the end faces, whereby the table is fixed in a position above the top side of the block and parallel with the bottom surface of the block. The length of the block is adjusted in such a way that the flanges 2, 3 make contact with the end faces only by way of the inwardly bent edges 5, 6 while the rest of the table is completely free from the block.
The vibrator is of the kind in which the vibrations are generated by a roller body enclosed in a tube 11 adapted to be driven from a flexible shaft insertable into the rear end 12 of the tube, the vibrations being transmit-ted to the tube 11 and from this to the table 1. In the embodi- Patented Sept. 24, 1963 v fits in said openings without play but with a slight sliding fit so that the vibrator may be positioned properly in relationship to the table. When the table is then placed on theblock and the flanges 2, 3 are put under tension on account hereof, the vibrator tube 11 is locked against .the edges of said openings at the same time as the horizontal part of the table is applied against the vibrator-tube by the spring force transferred from the flanges so that the vibrator becomes rigidly joined with the table. Thanks to the connection described between the vibrating table and the block 4 and by virtue of the resiliency of the block I material, the table as a whole may thus be entrained in the vibrations of the vibrator without the vibrations being damped appreciably by the block. To attain this effect,
the block need of course not be made of resilient material throughout but it is sufficient if the edges 5, 6 engage in resilient portions of the block.
FIG. 1 shows how the vibrating table may be used for vibrating e.g. an impression spoon 13. The spoon is clamped to the table by means of a cross-piece 14 and two screws 15, 16 having nuts 17, 1-8. The screws are introduced by their heads 19 through holes 20, 21 in the table-top and are then displaced along the underside of the table through slots 22, 23 extending from said holes, after which the nuts 17, 18 may be tightened against the orosspiece 14 while the beads 19 of the screws engage the underside of the table. The impression spoon is secured to the table by arms 24 extending from the spoon being clamped between the table-top and the crosspiece 14, in doing which the arrangement should be such that the impression spoon is simultaneously pressed against the table with its lower side. In order to prevent the nuts 17, 18 from loosening during the vibrating process, they should be provided with a nut-lock of some suitable kind.
In the embodiment shown in FIGS. 4-6, the vibrator 11, 12 is inserted with a close fit in an opening in the rubber block 4 which has in its top side a longitudinally extending recess 24 which lays bare the vibrato-r along its vibrating end. In addition, the block is provided at one end with a wedge-shaped recess 25. In other respects the block is formed and intended to be used in such a way that is described in greater detail in Patent No. 3,081,980 granted March 19, 1963. As in FIGS. 13 the table 1 is provided with mounting flanges 2, 3 which form together with the table a resilient clamp by means of which the table may be mounted on a proper level above the block. The necessary firm contact with the vibrator is accomplished in this case by means of a number of pins 26, 27, 28 which are secured to the table along its central line parallel to the mounting flanges. When the mounting flanges are forced on to the block their edges 5, 6 slide against the end faces 9, 10 until they snap in below the corresponding end edges of the block or into grooves in the end faces of the block, the pins 26, 27, 28 then arriving into abutment with the vibrator tube 11, 12. At the same time the table is slightly bent about its centre line so that the pins are offered against the vibrator tube with a resilient pressure. After the table has thus been fixed in its proper position the resilient pressure on the pins is maintained by the bent-in edges 5, 6 of the mounting flanges enclasping the end face edges of the block or engaging into grooves in said end faces of the block. In order to facilitate securing of the table to the block, the end faces 9, '10 of the block may be bevelled as shown 'at 7, -8 in FIG. 2.
The impression spoon '13 may be secured to the table by means of screw clamps or any kind. In FIGS. 4-6 two screw clamps are shown each comprising a caliper 29, which may be clamped by means of two screws 30, 31 to the edges of the portion of the table that has no mounting flanges, and a cross-piece 32 which may be adjusted in various positions by means of nuts 33, 34 for retaining the impression spoon.
What is claimed is:
1. An improved mounting assembly for dental vibrators comprising; a block-shaped holder having a longitudinal axis; a tubular vibrator mounted on said holder; a vibrating table mounted in vibratory contact with said tubular vibrator and being vibrated thereby; connecting means for detachably connecting said vibrating table to said holder and tubular vibrator Without appreciably dampening the vibrations of said vibrating table, said connecting means including a holder clamping device, said holder clamping device comprising a yoke-shaped clamping mem- :ber integral with said table and having elastic flanges arranged normal to said longitudinal axis and tensionally enclasping the block-shaped holder at opposite sides thereof, said flanges being slidable longitudinally to slide 3. A mounting device as claimed in claim 2, in which the vibrator is held in lengthwise engagement with the underside of the table.
4. A mounting device as claimed in claim 1, in which the vibrator is resiliently mounted inside the holder below the table, pins secured to the table and passing through an opening in the holder being arranged in vibratoryv contact with the vibrator.
References Cited in the file of this patent UNITED STATES PATENTS 2,255,799 Meinzer Sept. 16, 2,447,712 Nathan Aug. 24, 1948 2,546,806 Wenander .4. Mar. 27, 1951 2,728,562 Bailey Dec. 27, 1955 2,757,908 Broadwin Aug. 7, 1956