US1951020A

US1951020A - Antivibration support

Info

Publication number: US1951020A
Application number: US558702A
Authority: US
Inventors: Herman F Hoevel
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-08-22
Filing date: 1931-08-22
Publication date: 1934-03-13
Anticipated expiration: 1951-03-13

Description

March 13, 1934. H. F. HOEVEL 5 ANTI VIBRATION SUPPORT Filed Aug. 22, 1931 m I 23 {2 H 23 INVENTOR HERMAN E f/OEVEL BY fiad-m 4 ATTORNEYS Patented Mar. 13, 1934 UNITED STATES PATENT" OFFICE 3 Claims.

My invention relates to supports for machinery or other articles subject to vibrations, and has for its object to provide an improved construction for preventing such vibrations from being transmitted to the floor or other structural element on which the support is mounted. Separate provision is made for damping vibrations occurring in different directions, for instance horizontal and vertical, and my improved support can be readily varied and adjusted to meet different conditions.

Without desiring to restrict myself to the details illustrated, I will now proceed to describe two typical embodiments of my invention with referonce to the accompanying drawing, in which Fig. 1 is a plan view showing one form of my invention; Fig. 2 is a vertical section on line 2-2 of Fig. 1; Fig. 3 is a partial plan View of another embodiment; and Fig. 4 is a partial vertical section, on line 44 of Fig. 3.

At 11 I have indicated the bottom plate having holes 12 adapted to receive bolts (not shown) for securing said plate to the floor or other support. Upon this plate is mounted the housing 13, secured 5 thereto by bolts 14 which extend into registering holes of the bottom plate and of the flange at the lower end of the housing. This flange may also have holes 13' in registry with the holes 12, so that the bolts securing the bottom plate 11 to the hour or other foundation will also serve to fasten the housing to the bottom plate. The housing has a central opening through which projects upwardly a central projection at the top of a supporting member 16, the major portion of which.

is located within the housing 13. The opening in the top of the housing is large enough to permit play of the supporting member 16 horizontally in both directions (from front to rear and from side to side), and the body or inner portion of said member is spaced from the surrounding walls of the housing, for the same purpose. In addition to being movable horizontally, the supporting member 16 is also capable of an up-and-down movement in unison with the supported machine,

one leg of which is indicated at 15. This leg is secured or clamped in position by means of a. bolt 18, nut 20, and lock nut 19. It will be understood that there will be as many antivibration supports of the character herein set forth, as the machine has legs 15 or equivalent parts. While the housing 13 has been shown as square in plan view, this particular shape is not essential to my invention.

The bolt 18 screws into the supporting member 16, and the lower end of said bolt engages a steel plate or abutment 21, located and guided for upand-down movement in a chamber 16 at the top of said member, said abutment being engaged by the upper end of a coiled spring 17, the lower end of which bears upon another steel plate 22 resting on a layer (plate) 23 of a material, for instance cork, which is elastic and as such has the property of insulating, that is, of deadening or damping vibrations and sound. The tension of the spring 17 may be adjusted with the aid of the screw bolt 18, which permits of varying the distance between the abutment 21 and the top of the supporting member 16.

My invention relates particularly to means interposed between the housing 13 and the supporting member 16 to engage the sides and the top of said member. Between the top of the housing and the marginal portion of the top of the supporting member, I interpose a layer (sheet) 24 of elastic insulating material, for in- '15 stance celotex or balsa wood, which should have sufiicient structural strength to resist or counteract the pressure of the spring 1'7, which is precompressed when the device is assembled at the factory, and to take up upward vibrations after the device has been installed. The inner edge of said insulating material 24 is preferably in engagement with vertical surfaces on the central upward projection of the supporting member 16, so as to hold said material in its desired position, and so as to allow the said supporting member to simply slide (without any wedging action) Where it engages said edge, during the up-and-down vibrations of said supporting member. Another advantage of this feature is that it will prevent the formation, between the member 16 and the insulating material 24, even during vertical vibrations of said member, of a crack through which grit or other foreign matter might enter. On the sides of the supporting member 16, in engagement with the outer surface thereof, I provide insulating material 25, preferably considerably more elastic than the top material 24, but the structural strength of this material 25 generally need not be as great as that of the material 24. As a suitable material for the lateral layers 25, I may use cork, this being of smaller structural strength but greater elasticity than celotex or balsa Wood. In cases where lateral pressure is exerted by the pull of a belt or other forces against the side insulating material 25, I should use material of greater structural strength on the particular side or sides toward which such forces are exerted, to withstand such lateral pressure. When the housing is of quadrilateral (square) form as shown, four layers or sheets of the material 25 would preferably be used, each of them engaging one side of the supporting member 16, it being understood that the body of such member has a cross section similar to that of the housing, that is to say, a square cross section in the particular embodiments shown. The elastic material 25 takes up horizontal vibrations, while vertical vibrations are taken up largely by the spring 17 and partly by the

elastic layers

23 and 24. Transmission of vibrations to the base plate 11 and to the foundation will thus be efficiently prevented, and noise will be minimized. V I 7 While the outer faces of the layers 25 might be in direct contact with the inner surface of the housing 13, I find it desirable to interpose shims, preferably wedge-shaped, between such parts, so that the layers 25 may be held in place more securely and may also be given an initial compression or precompression.

In Figs. 1 and 2, the shims 26 taper upwardly, their outer surfaces being inclined to match similarly inclined inner faces of the housing 13.- The lower edges of these shims engage the bottom plate 11. Thus, when the housing 13 is drawn down by the bolts 14 in assembling the device, a wedge action will be exerted between the housing and the shims to compress the material 25 between such shims and the sides of the supporting member 16.

In Figs. 3 and 4 the shims 26, instead of tapering upwardly, are tapered horizontally, from one end to the other, the inner surface of the housing having oblique vertical surfaces of an inclination corresponding to such taper, as shown clearly in Fig. 3. Horizontal screws 27, threaded into the housing 13, engage the wedge-shaped shims 26' at their wide ends, and it will be obvious that by means of said screws the shims may be moved longitudinally to compress the insulating layers 25 to the desired extent, after the device has been installed.

Various modifications may be made without departing from the nature of my invention as set'forth in the appended claims.

I claim:

1. An anti-vibration support comprising a stationary member, an elastically mounted movable member adapted for connection with the structure to be supported, insulating elastic material interposed between said members to take vertical strains, separate elastic insulating material located between the sides of said members, and shims engaging said lateral insulating material, said shims being wedge-shaped to compress the insulating material.

2. An anti-vibration support according to claim 1, in which the shims are tapered vertically to permit of precompressing the lateral insulating material duringthe assembling of the support.

3. An anti-vibration support according to claim 1, in which the shims are tapered lengthwise and co-operate with oblique surfaces on the stationary member.

HERMAN F. HOEVEL.