Vibration Isolator With An Off-Set Seismic Mount

Abstract

A shock mount includes four guide bolts and two rectangular guide assemblies to control motion. The guide bolts are fixed to a bottom portion and nuts are threaded onto the guide bolts to limit vertical travel of a sprung portion of the shock mount. The rectangular guide assemblies include a vertical guide plates separated from a bracing plate by a rubber sleeve to guide vertical movement of the sprung portion. One embodiment includes a horizontally offset support plate attachable to machinery.

Claims

1. An off-set shock mount comprising: an unsprung bottom portion; a sprung top portion residing above the bottom portion; a support plate attached to the top portion and configured to attach to a protected structure; a spring in compression between the bottom portion and the top portion and supporting the top portion; and two guide assemblies guiding vertical motion of the sprung portion.

2. The off-set shock mount of claim 1, further including at least two guide bolts limiting vertical motion of the top portion.

3. The off-set shock mount of claim 2, wherein at least two guide bolts comprise four guide bolts.

4. The off-set shock mount of claim 2, wherein pairs of nuts are tightened together on a top portion of each of the guide bolts to limit the vertical motion of the top portion.

5. The off-set shock mount of claim 1, wherein the two guide assemblies comprise: vertically upward reaching bracing plates attached to the bottom portion; vertically downward reaching guide plates attached to the top portion; and the bracing plates and guide plates overlapping to limit horizontal movement of the top plate.

6. The off-set shock mount of claim 5, wherein the two guide assemblies include sleeves between the bracing plates and guide plates;

7. The off-set shock mount of claim 5, wherein the sleeves are rubber sleeves.

8. The off-set shock mount of claim 5, wherein the guide plates comprise a pair of parallel guide plates and the bracing plate comprise a single bracing plate residing between the pair of parallel guide plates.

9. The off-set shock mount of claim 1, further including a pre-load bolt threadedly engaging the top portion and bearing against the spring to pre-load the spring.

10. An off-set shock mount comprising: an unsprung bottom portion; a sprung top portion residing above the bottom portion; a support plate attached to the top portion and configured to attach to a protected structure; a spring in compression between the bottom portion and the top portion and supporting the top portion; two guide assemblies guiding vertical motion of the sprung portion; four guide bolts limiting vertical motion of the top portion; two guide assemblies comprising a pair of parallel guide plates and a single bracing plate residing between the pair of parallel guide plates; and a pre-load bolt threadedly engaging the top portion and bearing against the spring to pre-load the spring.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0006] The above and other aspects, features and advantages of the present invention will be more apparent from the following more particular description thereof, presented in conjunction with the following drawings wherein:

[0007] FIG. 1 shows a perspective view of a set of shock mounts according to the present invention supporting machinery.

[0008] FIG. 2 shows a top view of the set of the shock mounts according to the present invention supporting the machinery.

[0009] FIG. 3 shows a side view of the shock mounts according to the present invention supporting the machinery.

[0010] FIG. 4 shows an end view of the shock mounts according to the present invention supporting the machinery.

[0011] FIG. 5 shows a more detailed of the shock mounts according to the present invention supporting the machinery.

[0012] FIG. 6 shows a perspective view of the shock mount according to the present invention.

[0013] FIG. 7A shows a front view of the shock mount according to the present invention.

[0014] FIG. 7B shows a side view of the shock mount according to the present invention.

[0015] FIG. 7C shows a top view of the shock mount according to the present invention.

[0016] FIG. 8A shows a cross-sectional view of the shock mount according to the present invention taken along line 8A-8A of FIG. 7B.

[0017] FIG. 8B shows a cross-sectional view of the shock mount according to the present invention taken along line 8B-8B of FIG. 7A.

[0018] FIG. 9 shows a cross-sectional view of the shock mount according to the present invention taken along line 9-9 of FIG. 8A.

[0019] FIG. 10 shows a cross-sectional view of the shock mount according to the present invention taken along line 10-10 of FIG. 8B.

[0020] FIG. 11 shows a cross-sectional view of the shock mount according to the present invention taken along line 8B-8B of FIG. 7A with the shock mount pre-loaded to isolate the machinery from shocks.

[0021] FIG. 12 shows the shock mount according to the present invention separated into a base and an isolated part.

[0022] FIG. 12A shows the elements of a rectangular guide assembly of the shock mount according to the present invention.

[0023] FIG. 13 shows an exploded view of the shock mount according to the present invention.

[0024] Corresponding reference characters indicate corresponding components throughout the several views of the drawings.

DETAILED DESCRIPTION OF THE INVENTION

[0025] The following description is of the best mode presently contemplated for carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of describing one or more preferred embodiments of the invention. The scope of the invention should be determined with reference to the claims.

[0026] Where the terms about or generally are associated with an element of the invention, it is intended to describe a feature's appearance to the human eye or human perception, and not a precise measurement, or typically within 10 percent of a stated value. All dimensions are in inches unless otherwise stated.

[0027] A perspective view of a set of offset shock mounts 30 according to the present invention supporting a protected structure, for example machinery 32 is shown in FIG. 1, a top view of the set of shock mounts 30 supporting the machinery 32 is shown in FIG. 2, a side view of the set of shock mounts 30 supporting the machinery 32 is shown in FIG. 3, and an end view of the set of shock mounts 30 supporting the machinery 32 is shown in FIG. 4. The shock mounts 30 may include lateral attachment plates 22 (also see FIG. 5) attaching the shock mounts 30 to the machinery 32 using mounting bolts 23.

[0028] A detailed view of the set of shock mounts 30 supporting the machinery 32 is shown in FIG. 5. The lateral attachment plates 22 do not add height to the supported machinery 32.

[0029] A perspective view of the shock mount 30 is shown in FIG. 6, a front view of the shock mount 30 is shown in FIG. 7A, a side view of the shock mount 30 is shown in FIG. 7B, and a top view of the shock mount 30 is shown in FIG. 7C. The shock mount 30 includes a sprung portion 30a and an unsprung portion 30b. A spring 6 resides between the sprung and unsprung portions 30a and 30b supporting the sprung portion 30a. The shock mount 30 further includes a rectangular guide assembly 34 which comprises a bracing plate 11 attached to the bottom plate 2, parallel pairs of guide plates 3 attached to the top plate 1 by L-shaped sides 4 supported by stiffener plates 5, and a rubber sleeve 12 between the guide plates 3 and the bracing plate 11 (see FIG. 12). Guide bolts 16 are fixed to the bottom plate 2 and pass through the L-shaped sides 4 to align the sprung portion 30a with the unsprung portion 30b. The guide bolts 16 are preferably inch, grade 5, all threaded socket bolts, 13 threads per inch. Pairs of nuts 10 are tightened together onto the guide bolts 16 to limit vertical travel of the sprung portion 30a of the shock mount 30. There are at least two guide bolts 16, and preferably three guide bolts 16, and more preferably four guide bolts 16.

[0030] Those skilled in the art will recognize that other guide assemblies may be developed, but an offset shock mount with other features of the present invention but including a different guide assembly fails to depart from the scope of the invention set forth in the claims. For example, the pairs of guide plates 3 may be fixed to the unsprung bottom portion 30b and the bracing plate 11 may be fixed to the sprung top potion 30a.

[0031] A cross-sectional view of the shock mount 30 taken along line 8A-8A of FIG. 7B is shown in FIG. 8A, and a cross-sectional view of the shock mount 30 taken along line 8B-8B of FIG. 7A is shown in FIG. 8B. A bolt 9 extends from the top of the sprung portion 30a and reaches through the sprung portion 30a to a compression plate 7 residing on top of the spring 6. The bolt 9 may be advanced through the top 1 and against the compression plate 7 to load the spring 6.

[0032] A cross-sectional view of the shock mount 30 taken along line 9-9 of FIG. 8A is shown in FIG. 9 and a cross-sectional view of the shock mount 30 taken along line 10-10 of FIG. 8B is shown in FIG. 10. The rectangular guide assemblies 34 guides the top portion 30a during vertical travel.

[0033] A cross-sectional view of the shock mount 30 taken along line 8B-8B of FIG. 7A with the shock mount 30 pre-loaded by advancing a pre-load bolt 9 against the compression plate 7 to compress the spring 6 to isolate the machinery 32 from shocks is shown in FIG. 11. The pre-load bolt is preferably a inch diameter, grade 5, full threaded, 10 thread per inch bolt. A gap 36 is created by pre-loading the spring 6 to allow vertical motion of the sprung portion 30a.

[0034] The shock mount 30 separated into an unsprung portion 30b and a sprung portion 30a is shown in FIG. 12 and elements of the rectangular guide assemblies 34 are shown in FIG. 12A. The rectangular guide assemblies 34 includes the parallel pairs of guide plates 3 attached to the sprung portion 30a, the bracing plate 11 attached to the unsprung portion 30b, and the rubber sleeve 12 between the parallel pairs of guide plates 3 and the bracing plate 11.

[0035] An exploded view of the shock mount 30 is shown in FIG. 13. The shock mount 30 preferably includes: [0036] 1 top plate [0037] 2 bottom plate [0038] 3 parallel guide plates [0039] 4 L-shaped side [0040] 5 stiffener plate [0041] 6 compression spring [0042] 7 compression plate [0043] 8 spring seat [0044] 9 pre-load bolt [0045] 10 nuts [0046] 11 bracing plate [0047] 12 rubber sleeve [0048] 13 bolts neoprene rubber grommet [0049] 14 selected narrow fw 0.625 [0050] 15 preferred narrow fw 0.5 [0051] 16 guide bolts [0052] 17 hnut 0.5000-13-d-n [0053] 18 hnut 0.7500-10-b-n [0054] 19 regular lock washer 0.5 [0055] 20 middle stiffener plate [0056] 21 top support plate [0057] 22 support plate [0058] 23 mounting bolts [0059] 30 shock mount [0060] 30a sprung portion [0061] 30b unsprung portion [0062] 32 machinery [0063] 34 rectangular guide assembly [0064] 36 gap

[0065] While the invention herein disclosed has been described by means of specific embodiments and applications thereof, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.