Resilient machinery base

2,064,751

Dec. 15, 1936

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C. HUSSMAN

RESILIENT MACHINERY BASE

Filed Nov. 27, 1933

Sheets-Sheet 1

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Dec. 15, 1936.

2,064,751

C. HUSSMAN

RESILIENT MACHINERY BASE

<img file="US2064751A_D0005.tif" />

<img file="US2064751A_D0006.tif" />

Dec. 15, 1936.

2,064,751

C. HUSSMAN

RESILIENT MACHINERY BASE

<img file="US2064751A_D0007.tif" />

<img file="US2064751A_D0008.tif" />

Dec. 15, 1936.

C. HUSSMAN

RESILIENT MACHINERY BASE Filed Nov. 27, 1933

2,064,751

Sheets-Sheet 4

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Patented Dec. 15, 1936

2,064,751

UNITED STATES PATENT OFFICE

2,064,751 resilient machinery base Carl Hussman, Chicago, Hl., assignor to United States Gypsum Company, Chicago, Bl., a corporation of Illinois

Application November 27,1933, Serial No. 699,861

Claims.

(CL 248—21) snubbing device for the machinery base taken on line 6—6 of Fig. 7,

Fig. 7 is a sectional plan view through the snubbing device taken on line 7—7 of Fig. 6,

Fig. 8 is a sectional plan view through the snub- 5 bing device taken op line 8—8 of Fig. 6,

Fig. 9 is a sectional elevation through the machinery base taken on line 9—9 of Fig. 3,

Fig. 10 is a plan view of one of the removable spring clip units, 10

Fig. 11 is a sectional view through one of the spring clip units taken on line 11—11 of 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 15 Fig. 12,

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, 20

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. 25

In constructing my improved machinery base, I provide a machine platform 20 which may be rectangular in shape, or any other desired shape to receive a frame 21 of the machine to be supported. The platform 20 is preferably con- 30 structed 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 35 outer edge of said platform. An elongated shield 26 has its inner edge resting on top of the flange 24,adownwardlyextendingflange,27 on the shield 26 serving to provide interlocking engagement of the shield with the flange 24. A downwardly ex- 40 tending flange 20 is formed on the outer edge of the shield 20, 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 31 is formed on the base 30, 45 said pad being adapted to receive a series of spring seats 32, said seats being arranged to contact with limiting stop shoulder 33 adjacent the inner edge of said pad. A pair of semi-elliptical spring clips 34 are arranged with their inner 50 ends mounted on the seats 32 and secured thereto by means of rivets 35. An outstanding flange 33 is provided on the seat 32 to properly position the inner ends 39 of the spring clips 34. Suitable clearance recesses 49 are provided In the bottom 55

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 trans6 mission of vibration, and sound from a moving machine to a supporting structure.

In the copending application of B. E. Balduf, Serial No. 545,707, filed June 20, 1931, entitled “Resilient machinery bases”, resilient flat spring 10 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. Du? to the peculiar 15 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 on improperly tempered, the springs sometimes break under repeated flexing. The broken springs are difficult to remove without entirely dismantling the machinery base. The type of snubbers disclosed in the aforesaid co-pending application 23 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 30 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 35 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, ⁵⁰ Fig. 4 is a sectional elevation through the machinery base taken on line 4—4 of Fig. 2,

Fig. 5 is a sectional elevation through the machinery base taken on line 5—5 of Fig. 1,

U5 Fig. 6 is a sectional elevation through g ion» of

9,054,701 of the seats SI for receiving the lower heads of the rivets SV. Each of the outer ends of the seats SI is provided with a stop shoulder 41 which engages against a bolt 42. The bolts 42 5 pass through the base SO and are provided with nuts 41 and washers 44 for securing the seats S2 in position on the base SO. The upper ends 40 of the spring clips S4 are secured, as by rivets 41, to a bracket 40 which is elongated in form and 10 is provided with a central rib or shoulder 40α which serves to space apart the two spring clips which form a spring unit. Curved surfaces 40 are provided on the seats S2 and brackets 40 to conform with the shape of the ends of the spring IS clips S4, and shoulders 00 on the seats 32 and brackets 40 serve to space apart the ends of the spring clips.

In order to secure the bracket 40 to the platform 20, a cap bolt 62 passes through the plat20 form 20 and is threaded into the bracket 40 and shoulder 40α. The cap bolt is provided with a head 03 and a lock washer 64. A hole 06 of larger diameter than an unthreaded section 66 of the bolt 62, passes through the platform 20 and 25 extends for a limited distance into the bracket 40.

A tapped hole 61 is formed in the seat 32 and shoulder 30 concentric with the bolt 62 and of smaller diameter than said bolt. When it is desired to remove one of the spring units for the 30 purpose of Inspection or repair, the bolt 62 is removed and a fillister head cap screw 00 or a headed bolt adapted to be engaged by a socket wrench is substituted for the bolt 62 and threaded into the hole 57. Upon tightening the screw 50, ³⁸ the two springs comprising the spring unit are compressed so that the bracket 40 is separated from the bottom of the platform 20 to form a clearance space. Upon loosening the nuts 43, the spring units can then be moved laterally out 40 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 61 passes through the shield 26 and is threaded into the bolt head 45 53 to secure the shield 26 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 may be necessary to employ mul50 tiple leaf springs as seen in Figs. 12 and 13. In these views, an outer spring 63 and an inner spring 64 are formed in semi-elliptic shape and have their ends secured at the bottom to a seat 15 and at the top to a bracket 66. A tap bolt 55 opening 67 is provided in the bracket 66 for attachment to the platform 20. By the use of these multiple leaf springs, the springs may be placed very closely together between the platform and the base 30, thus supporting very heavy 60 machinery. Additional leaves may be added to the spring units if desired. In this 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 65 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 70 vibratory movements of its parts. Furthermore, spring clips at the end 69 of the machinery base are placed at right angles to the springs along the side 70 of the machinery base, giving great lateral stability to the machine and effectually 75 preventing any movement of the platform 20 ex cept 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 72 along the edge of the ₈base 30, the web of said runner being secured by cap screws 13 to said base. The upper edge of the base flange 14 extends above the bottom of the shield flange 20 so as to practically prevent water from entering the interior of the ma- ₁₀chinery base as when the floors of the building are washed of scrubbed. When removing one of the spring units, the screws 73 are removed and the runner 72 withdrawn to permit easy withdrawal of the spring unit. It is, of course, 15 necessary also to remove the shield 26 by removing the screws 61 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 different from that previously 20 described in that fewer spring units 76 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 77 25 may be welded near the periphery of a base 18, bolt holes 70 being provided in the outstanding edge 00 of the base 76 for the purpose of attaching the base to the floor. In this type of machinery base a machinery platform 82 is pro- 30 vided with a peripheral downstanding shield 83, which co-operates with the splash plate 77 to prevent the entry of wash water into the interior of the machinery base. Bolts 84 are provided for attaching the machine to the platform 82. 33 Bolts 86 secure the upper bracket 06 to the bottom of the platform 62, and rivets 07 secure a bottom seat 60 of the spring unit to the base 70.

In order to prevent excessive rocking of the machine 21, due to massive moving parts of the ,₁₀machine, or due to the movement of the base 30, as would occur on shipboard, or on moving vehicles, such as automobiles, I provide suitable snubbers at the corners of the platform 20. These snubbers (Fig. 4) are preferably in the form of _ta pair of concentric, resilient bellows 90 and 91, 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 her- _Gmetically 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 40% 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 °^υliquids.

After the bellows unit is assembled, it is placed over a bolt 96 on a corner of the frame 20 with a cork or lead washer 97 between the ring 93 and the frame 20. A cork or lead washer 90 is ° placed on top of the ring 92 and a steel washer 99 is then placed in position over the bolt 96. A nut 100 and a lock nut 101 are threaded on to the top of the bolt 96 and sufficient pressure is applied to the bellows unit by means of the nut * 100 so as to prevent undue rocking of the platform 20 due to the flexing of the springs 34. A cup-shaped cover plate 102 is then secured over the bellows assembly, the plate 102 being provided 75

8,064,751 space between the flanges 107 and a cementitious filling material 139, such as gypsum, concrete or the like is formed in the box 134 on top of the plate 138 so as to form a resilient foundation of considerable mass to support a vibrating machine 5 140. Reinforcing mats 141 and 142 are embedded in the foundation 139 adjacent Its bottom and top respectively. A flange 143. extends around the foundation 139, being secured, as by welding, to the flange 135. The flange 143 extends down- 10 wardly to a point somewhat above floor 131 to form a wing 144 for the purpose of keeping wash water, dirt, etc., out of the interior of the machinery base. In order to secure the box 134 and foundation 139 to the platform 122, a shoul- 15 dered sleeve 145 extends through an opening 146 in the box 134 and into a recess 147 in the platform 122. A tap bolt 148 passes through the sleeve 145 and engages a threaded opening 149 in the platform 122. A tube 150 extends through the 20 foundation 139 around ahead 151 of the bolt 148, said tube having an inside diameter sufficient to permit the operation of a socket wrench on the bolt head 151. A plug 102 is loosely fitted inside the tube 150 above the bolt head 151 so as to pre- 25 sent a smooth surface flush with the top of the foundation 139, this plug being withdrawn when it is desired to remove the bolt 148. A threaded hole 163 smaller in diameter than the hole 149, is formed in the base 123 concentric with the hole 30 149 so that when the bolt 148 is removed, a cap screw or bolt of smaller diameter can be substituted and used, as in Fig. 11, to compress the spring clips 121 and permit the removal of one of the spring units for inspection and repair, 35 without removing other spring units or stopping the operation of the machine 140.

Spring clips 34, 03, 64 and 76 are preferably constructed in a shape other than true elliptic, such as parabolic, to begin with, but are arranged 40 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 45 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 50 precisely to these details, since, manifestly, the same may be considerably varied without departing from the spirit of the invention as defined in the appended claims.