US 2064751 A
Description (OCR text may contain errors)
Dec. 15, 1936. HUSSMAN 2,064,751
RESILIENT MACHINERY BASE Filed Nov. 27, 1955 4 Sheets- Sheet 1 i INVENTOR IV A CAR HU55MAN- L 108 1.15- 4/09 BY A"FTORNEY Dec. 15, 1936. HUSSMAN 2,064,751
RESILIENT MACHINERY BASE Filed Nov. 27, 1955 4 Sheets-Sheet 2 INVENTOR CARL HvssMAN'. WZ so 'ATT'ORNEY J M! d 5 H 5 W T f 2 m G a) 0 a 2 2 WM M. w 5 v 1 a Z d 6 l L4 v E5 0 i 4 J/L 3 Pv WW 7 Dec. 15, 1936. c HUSSMAN 2,064,751
RESILIENT MACHINERY BASE 4 Sheets-Sheet 5 Filed Nov. 2'7, 1933 INVENTOR CARL HU5SMAN- ATTORNEY Dec. 15, 1936.
C. HUSSMAN RESILIENT MACHINERY BASE Filed Nov. 27, 1935 I 26 ii?) 12 121 4 Sheets-Sheet 4 INVENTOR CAEL HU5MAM- ATTORNEY Patented Dec. 15, 1936' PATENT OFFICE RESILIENT MACHINERY BASE Carl Hussman, Chicago, Ill., assignor to United States Gypsum Company, Chicago, 111., a corporation of Illinois Application November 27, 1933, Serial to... 699,861 5 Claims- (c1. 248-21) This invention relates to anti-vibration bases for supporting moving machinery or the like, and has reference more particularly to spring held machinery bases adapted to prevent the transmission of vibration. and sound from a moving machine to a supporting structure.
In the copending application of B. E. Balduf, Serial No. 545,707, flled June 20, 1931, entitled Resilient machinery bases, resilient flat spring clips or springs are used in series to support a platform or base for a piece of moving machinery. These spring clips are rigidly attached to the base supporting the machine and also to the supporting structure for the springs. Due to the peculiar shape of the springs in which a central saddle member is connected to outstanding integral resilient loops, it has been found that under severe conditions of vibration, as when extremely-heavy machinery is supported, or where the springs are improperly tempered, the springs sometimes break under repeated flexing. The broken springs are difllcult to remove without entirely dismantling the machinery base. The type of snubbers disclosed in the aforesaid co-pending application have also been improved upon especially for use with machinery having massive moving parts serving to rock the.machinery base.
An object of this invention, therefore, is to provide an improved type of resilient supporting clip for machinery bases, which is less liable to break under extreme vibration conditions. Another object of the invention is to provide springs which may be removed from the machinery base without stopping the operation of the machine in case a spring becomes broken.
A further object of the invention is to provide an improved type of snubber for machinery bases; also to improve resilient machinery bases'in other respects hereinafter specified and claimed.
Reference is to be had to the accompanying drawings forming a part of this specification, in which- Fig. 1 is a perspective view of the assembled machinery base,
Fig. 2 is a plan view of a modified form of the machinery base with parts broken away to disclose the construction,
Fig. 3 is a sectional view through the machinery base taken on line 3-3 of Fig. 2,
Fig. 4 is a, sectional elevation through the machinery base taken on line 4-4 of Fig. 2,
Fig. 6 15a sectional elevation through a form. of
snubbing device for the machinery base taken on line 6-6 of Fig. '7, I
Fig. '7 is a. sectional plan view through the snubbing device taken on line l-I of Fig. 6,
Fig. 8 is a sectional plan view through the snub bing device taken on line 8-6 of Fig. 6,
Fig. 9 is a sectional elevation through chinery base taken on line 9-8 of Fig. 3,
Fig. 10 is a plan view of one of the removable spring clip units,
Fig. 11 is a sectional view through one of the spring clip units taken on line I l-- l l 01' Fig. 10,
Fig. 12 is a plan view of a modified form of multiple leaf spring clips,
Fig. 13 is a side elevation of the clip shown in Fig. 12, g
Fig. 14 is a central sectional elevation of a modified form of snubber,
Fig. 15 is a plan view of a modified form of removable resilient unit,
Fig. 16 is an elevation of the unit shown in Fig. 15, and
Fig. 17 is a sectional elevation of a machine base assembly utilizing the resilient unit shown in Figs. 15 and 16.
In constructing my improved machinery base, I provide a machine platform 20 which may be rectangular in shape, or any other desired shap to. receive a frame 2i of the machine to be supported. The platform 20 is preferably constructed with openings 22 intermediate its edges, flanges 23 being formed adjacent the opening 22 for the purpose of imparting greater rigidity to the platform. An upstanding flange 24 is formed around the platform 20 spaced inwardly from the outer edge of said platform. An elongated shield 26 has its inner edge resting on top of the flange 24,adownwardlyextending flange.2' on the shield 26 serving to provide interlocking engagement of the shield with the flange 24. A downwardly extending flange 28 is formed on the outer edge of the shield 26, said flange 28 serving to reach within a short distance of the floor line 29 on which a stationary base 30 is supported.
An elongated pad 3| is formed on the base 30,
said pad being adapted to receive a series ofspring seats 32, said seats being arranged to contact'with limiting stop shoulder 33 adjacent the ends mounted on the seats 32 and secured thereto by means of rivets 35. An outstanding flange 38 is provided on the seat 32 to properly position the inner ends 39 of the spring clips 34. Suitable clearance recesses 40 are provided in the bottom of the seats 92 for receiving the lower heads of the rivets 9|. Each of the outer ends of the seats 92 is provided with a stop shoulder H which engages against a bolt 42. The bolts 42 pass through the base 99 and are provided with nuts I and washers 44 for securing the seats 22 in position on the base 99. The upper ends 99 of the spring clips 94 are secured, as by rivets 41, to a bracket 49 which is elongated in form and is provided with a central rib or shoulder a which serves to space apart the two spring clips which form a spring unit. Curved surfaces 49 are provided on the seats 92 and brackets 49 to conform with the shape of the ends of the spring clips 94, and shoulders 99 on the seats "and brackets 49 serve to space apart the ends of the spring clips.
In order to secure the bracket 49 to the platform 29. a cap bolt 92 passes through the platform 29 and is threaded into the bracket 49 and shoulder 49a. The cap bolt is provided with a head 99 and a lock washer 94. A hole 99 of larger diameter than an unthreaded section 99 of the bolt 92, passes through the platform 29 and extends for a limited distance into the bracket 49. A tapped hole 51 is formed in the seat 92 and shoulder 99 concentric with the bolt 92 and of smaller diameter than said bolt. When it is desired to remove one of the spring units for the purpose of inspection or repair, the bolt 52 is removed and a flllister head cap screw I9 or a headed bolt adapted to be engaged by a socket T wrench is substituted for the bolt 52 and threaded into the hole 51. Upon tightening the screw 99, the two springs comprising the spring unit are compressed so that the bracket 49 is separated from the bottom of the platform 29 to form a clearance space. Upon loosening the nuts 49, the spring units can then be moved laterally out from the machinery base and a new unit can be substituted in its place without stopping the operation of the machine supported upon the machinery base. A cap screw 9| passes through the shield 29 and is threaded into the bolt head 99 to secure the shield 29 in position, but still easily removable for inspection or removal of the spring units.
If desired, as when the machinery is very heavy to support, it maybe necessary to employ multiple leaf springs as seen in Figs. 12 and 13. In these views, an outer spring 63 and an inner spring 94 are formed in semi-elliptic shape and have their ends secured at the bottom to a seat and at the top to a bracket 69; A tap bolt opening 91 is provided in the bracket 99 for at tachment to the platform 29. By the use'of these multiple leaf springs, the springs may be placed very closely together between the platform and the base 99, thus supporting very heavy machinery. Additional leaves may be added to the spring units if desired. Inthis modified form, a suitable tool may be used to compress the springs for the purpose of removing the spring units from the machinery base for inspection or repair.
It will be noted that (Fig. 2) the spring clips are arranged around the periphery of the machinery base where they are most effective in preventing the rocking of a machine due to heavy vibratory movements of its parts. Furthermore, spring clips at the end 99 of the machinery base are placed at right angles to the springs along the side I9 of the machinery base, giving great lateral stability to the machine and effectually preventing any movement of the platform 29 except In a, vertical direction. In order to permit easy removal of the spring units, and at the same time prevent water and dirt from working into the interior of the machinery base, I provide a T-shaped runner I2 along the edge of the base 99, the web of said runner being secured by cap screws II to said base. The upper edge of the base flange 14 extends above the bottom of the shield flange 29 so as to practically prevent water from entering the interior of the machinery base as when the floors of the building are washed 0: scrubbed. When removing one of the spring units, the screws 13 are removed and the runner I2 withdrawn to permit easy withdrawal of the spring unit. It is, of course, necessary also to remove the shield 29 by removing the screws II when it is desired to inspect the spring units or remove any of them.
The form of machinery base shown in Figs. 1 and 5 is slightly diiferent from that previously described in that fewer spring units I6 are used for lighter machinery, and these spring units may be arranged in parallel relation to the edges of the machinery base instead of at right angles thereto, as shown in Fig. 2. A splash plate 11 may be welded near the periphery of a base I9, bolt holes I9 being provided in the outstanding edge 99 of the base I9 for the purpose of attaching the base to the floor. In this type of machinery base a machinery platform 92 is provided with a peripheral downstanding shield 99, which co-operates with the splash plate 11 to prevent the entry of wash water into the interior of the machinery base. Bolts 94 are provided for attaching the machine to the platform 92. Bolts 95 secure the upper bracket 99 to the bottom of the platform 92, and rivets 91 secure a bottom seat 99 of the spring unit to the base I9.
In order to prevent excessive rocking of the machine 2|, due to massive moving parts of the machine, or due to the movement of the base 39, as would occur on shipboard, or on moving vehicles, such as automobiles, I provide suitable snubbers at the corners of the platform 29. These snubbers (Fig. 4) are preferably in the form of a pair of concentric, resilient bellows 99 and 9I, which are made of corrugated metal. The ends of said bellows are sealed, as by soldering, about the inner and outer edges of an upper metal ring 92 and a lower metal ring 93, so as to make a hermetically sealed space 94 which may be filled with air, but is preferably filled with a material such as a mixture of 60% paraffin oil and 49% rosin. For extremely heavy duty, the space 94 is packed with steel wool of about 0.1 mm. thickness of fiber, the top ring 92 is sealed in, and then the voids in the steel wool are filled with the paraffin oil and rosin mixture by means of a pressure gun screwed into an opening not shown in the ring 92. The space 94 may also be filled with rubber, various solids, and various mixtures of solids and liquids.
After the bellows unit is assembled, it is placed over a bolt 99 on a corner of the frame 29 with a cork or lead washer 91 between the ring 93 and the frame 29. A cork or lead washer 99 is placed on top of the ring 92 and a steel washer 99 is then placed in position over the bolt 96. A nut I99 and a lock nut I9I are threaded on to the top of the bolt 99 and suillcient pressure is applied to the bellows unit by means of the nut I99 so as to prevent undue rocking of the platform 29 due to the flexing of the springs 34. A cup-shaped cover plate I92 is then secured over the bellows assembly, the plate I92 being provided with a downstanding flange I03, similar to the flange 20. I
Where desired, the modifled form of snubber illustrated in Fig. 14 may be used. This form comprises a resilient, annular bellows a, preferably of corrugated metal, secured by soldering, brazing, orthe like, to a pair of spaced, flat metallic rings 92a and 93a. The area between rings 92a and 93a is substantially fllled with a body comprising rings I04 oi resilientmaterial such as rubber separated by spacer rings I04a of lead or other suitable material. Rings I04 are preferably spaced somewhat from the convolutions of bellows 900. so as to allow for compressive, peripheral expansion, and are preferably tightly fitted about the shank of a bolt or rod II3a whereby to exclude air from the interior of the snubber.
In the form of device shown in Fig. 6, I disclose a modified form of machinery base. In this form of machinery base, the spring clips are entirely eliminated and an anti-vibration, supporting unit for the machine is constructed of a bellows unit preferably substantially identical in detall with that described and shown in Fig. 4, except that it may be somewhat greater in length; or the form of Fig. 14 may be used'. A machine platform I has a bellows unit I00 below said platform and a snubber bellows unit I01 above said platform. The bellows unit I00 rests upon a metal washer I00 which in turn is welded or otherwise secured to base I09. An upstanding flange I I I is also secured to the upper side of the base I09 to keep wash water or dirt out of the inside of the machinery base, said flange cooperating with a downwardly extending flange II2 formed on the platform I05. A stud bolt H3 is screwed into the washer I00 and base I09, said bolt extending upwardly through the bellows units I00 and I01 and being provided at its up-- per end with a nut H4 and washer II5. A cupshaped shield I I0 is provided between the washer H5 and bellows unit I01, said shield IIO also having an outstanding annular protective flange IIO which fits very loosely over an upstanding annular flange II9 formed on the platform I05. This form of device will be covered more speciflcally in an application which will be filed.
In the form of device shown in Figs. 15, 16, and 17, a removable spring unit is formed of a number of spring clips I and HI, which are arranged between a platform I22 and a base I23. Each of the spring clips has a central saddle member I24 and a pair of outstanding loops I25 terminating in outstanding flanges I20. Rivets or other fastening means I21 serve to secure the spring flanges I20 to the base I23. Ribs I20 are formed on the bottom face of platform I22 and engage the saddle members I24, being connected thereto by rivets I29. The spring clips are preferably arranged in pairs (Fig. 15), some of the pairs of clips I20 being arranged at right angles to other pairs of clips I2I so as to give great lateral stability to the base but still permitting free vibration of the platform I22 vertically under the impulse of a moving machine supported by said platform. Bolt holes I are provided in the base I23 for receiving bolts to securesaid base to a floor I3I or other supporting structure such as a plate I32.
The resilient unit may be placed beneath a machine platform comprising a metallic box I34 having upturned peripheral flanges I35 and a depressed central flange I30 terminating in a horizontal flange I31. A plate I30 covers the space between the flanges I31 and a cementitious fliling material I30, such as gypsum, concrete or the like is formed in the box I34 on top of the plate I30 so as to form a resilient foundation of considerable mass to support a vibrating machine I40. Reinforcing mats HI and I42 are embedded in the foundation I30 adjacent its bottom and top respectively. A flange I43.extends around the foundation I39, being secured, as. by welding, to the flange I35. The flange I43 extends downwardly to a point somewhat above floor I3I to form a wing I44 for the purpose of keeping wash water, dirt, etc.. out of the interior of the machinery base. In order to secure the box I34 and foundation I39 to the platform I22, a shouldered sleeve I45 extends through an opening I in the box I34 and into a recess I41 in the platform I22. A tap bolt I40 passes through the sleeve I40 and engages a threaded opening I49 in the platform I22. A tube I50 extends through the foundation I39 around a head I5I of the bolt I40, said tube having an inside diameter suflicient to permit the operation of a socket wrench on the bolt head II. A plug I52 is loosely fltted inside the tube I50 above the bolt head I5I so as to present a smooth surface flush with the top of the foundation I30, this plug being withdrawn when it is desired to remove the bolt I40. A threaded I hole I53 smaller in diameter than the hole I49, is formed in the base- I23 concentric with the hole I49 so that when the bolt I40 is removed, a cap screw or bolt of smaller diameter can be substituted and used, as in Fig. 11, to compress the spring clips I2I and permit the removal of one of the spring units for inspection and repair,
without removing other spring units or stopping theoperation of the machine I40.
Spring clips 34, 03, 04 and 10 are preferably constructed in a shape other than true elliptic, such as parabolic, to begin with, but are arranged to assume as nearly the true elliptical form as possible when placed under the machine load. By experiment, it has been found that in the true elliptic form. internal stresses of the clips under load are more nearly balanced, with a consequent increase in life of the clips under the vibratory movements of the machine base in use.
I would state in conclusion that, while the illustrated examples constitute practical embodiments of my invention, I do not wish to limit myself precisely to these details, since, manifestly, the same may be considerably varied without departing from the spirit of the inventionas defined in the appended claims.
Having thus described my invention, I claim as new and desire to secure by Letters Patent:-
I. In a resilient machinerybase, a base for rigid attachment to a supporting structure, a machine platform in spaced, parallel relation to said base, fiat springs between said platform and base and removably secured thereto, and screw means for compressing certain of said springs to provide for removal of said compressed springs said connecting bolt being operable from above said platform to compresssaidsprings and to provide for the independent removal of said spring units from said machinery base.
8. In a resilient machinery base. a metallic platform box, a cementitious slab formed in said oppositely disposed. semi-elliptical flat springs with the free ends thereof positioned in adjoining relation. metallic membersfor connecting said spring ends together, and screw means for compressing said springs by reducing the distance between said members so as to permit the withdrawal as a unit of a pair of said springs from said machinery base.
5. In a resilient machinery base, a machine platform for supporting a moving machine, a base. a plurality of flat springs removably mounted on said base and supporting said platform, and screw means for compressing certain of said springs to permit the removal thereof from said machinery base independently of the remaining springs.