US1978940A

US1978940A - Resilient block

Info

Publication number: US1978940A
Application number: US605504A
Authority: US
Inventors: Frederick M Guy
Original assignee: GUY AND MURTON Inc
Current assignee: GUY AND MURTON Inc
Priority date: 1932-04-15
Filing date: 1932-04-15
Publication date: 1934-10-30
Anticipated expiration: 1951-10-30

Description

Oct. 30,'1934. F. M. GUY

'RESILIENT BLOCK Filed April 15, 1952 INVENTOR Fredenic/f M G3i/Pq.

BYW 71.

ATTORN EY Patented Oct. 30, 1934 UNITED STATES PATENT FFICE RESILIENT BLOCK Application April 15, 1932, Serial N0. 605,504 7 Claims. (Cl. 287-85) My'invention relates to a resilient block and particularly to such a block for use as an insulator vibration dampener or cushioning element.

-Resilient members have been used heretofore in the construction of engine mountings, spring shackles, universal joints, clutches, and the like, and also have been used as sound insulators, vibration dampeners, and resilient cushions.

The resilient blocks heretofore in use have not been satisfactory due to their inability to be securely held in place without impairing the eliiciency of such blocks and subjecting them to rapid deterioration during the normal loperation of the devices of which they are a part.

It is, therefore, an object of my present invention to provide a durable resilient block which is simple in its construction and which may be readily attached at the point where it is to be used without impairing the efficiency of the resilient element.

. It is a, further object of my invention to pro-A vide a resilient block which is readily held in the desired assembly without wear of the resilient element due to relative movement between the parts of the assembly and the surface of the resilient element.

' It is a further object of my present invention to provide a resilient block wherein localized :loV cross strains in the resilient element are eliminated.

These, and variousl objects, Vfeatures of arrangement, construction and operation, are plainly shown and described and will be best understood by reference to theV accompanying drawing showing a preferred embodiment of my invention, in which:

Fig. 1 is a top plan view, showing a resilient block embodying my invention; 40 Fig. 2 is a cross sectional view in side elevation taken on the line 2--2 of Fig. 1;

Fig. 3 is an enlarged fragmentary View taken on the line 3 3 of Fig. 2.

Similar reference numerals refer to similar parts throughout the several views.

Referring more in detail to the drawing, 4 designates an inner core which is built up ofa plurality of layers of exible material 5, between each of which is interposed a layer of V rubber 6 secured to each of the layers of the flexible material 5. In the construction here shown, I use a loosely woven wire mesh as the eible material, but successful results may be achieved by the use of duck fabric and the 5I like.

The core 4 is built;I up around a mandrel of such size as to leave an opening in the center of the core slightly smaller in diameter than the outside diameter of the fastening member to be inserted therein. V3l) An outer shell 7 likewise is formed of a plurality of layers of flexible material 5, between each layer of which a layer of rubber 6 is secured.

The inside diameter of the outer shell 7 is such 65 that the core 4 is placed within and spaced apart from the outer shell 7, and rubber or similar resilient material 8 is secured to the inner core 4 and the outer shell 7. A groove 9 is formed in Athe resilient material 8 and extends on a line 70 concentric with the inner core 4 and the outer shell 7. The groove 9, as shown in Fig. 2, is placed in the resilient material 8 on each end of the block and is so formed that the point of greatest depth is at a point near the outer shell 7. From this point, the depth of the groove 9 decreases so that there is a body of the resilientmaterial 8 equal in thickness to the width of the outer shell 7 at the point of attachment to the outer shell 7.

It is apparent that if the width of the block remains constant, the volume of resilient material in the block would increase as the outer circumference of the block increases. Thus there would be unequal amounts of resilient material at the various points where working occurs in it. The grooves 9 in each end of the block equalize the volume o esilient material at all points where working occurs in the block. This is shown clearly in Fig. 2, from which it is apparent that as the circumference of the block increases, its thickness decreases to an amount to compensate for the added amount of resilient material due to the enlarged circumference.

The resilient material 8 is secured to the inner 95K core 4 and the outer shell 7 in such a manner thatrelative movement in any direction between the inner core 4 and the outer shell 7 is permitted by change in shape of the resilient material 8. For this reason I have found that rubber is a very satisfactory material for use as this resilient element 8.

I have found that this construction eliminates the localization of strains incident to surface bonding of the rubber block with the core or shell. The laminated construction of core 4 and shell 7 permits movement of any one layer of material relative to the next adjacent layer of material so that any strains transmitted tothe no core and shell are absorbed through the1 layers of material forming the core and shell.

I have found that by the use of rubber the whole resilient block can be moulded in any suitable size and shape and that the inner core 4 and the outer shell 7 will be held in their proper relative positions by surface contact' with the rubber which fills the space between the said inner core 4 and the vouter shell 7 and flows through the meshes of the material in the said core and shell to form layers of resilient material lying between adjacent layers of the material forming the core and shell.

As shown in Fig. 2, the grooves 9 in the resilient element 8 provide sufficient room to permit the expansion of the resilient material 8 when subjected to a compression strain. In addition, the grooves 9 in a block of this type permit the ends ofthe inner core 4 and the outer shell 7 to project beyond the resilient material 8, which provides a means whereby the resilient block may be used to connect two members without any direct contact with the resilient material 8. This projection of the inner core 4 and the outer shell 7 beyond the body of the resilient material 8 makes possible a connection with the resilient blocks so that the core 4 may be ex block where working occurs. Thus crossv strains cannot be localized in any particular part of the block but are borne by substantially the entire volume of rubber in the block.

When itis desired to incorporate a resilient block embodying my invention in .a device, the block may be bolted or -similarly fastened through the inside opening of the inner core-4 by a bolt or similar means of a slightly larger outside diameter than the inside diameter of the hole in the core 4. The outer shell 7 is clamped or secured in the device in any desired manner.- It has been found desirable to place the resilient material 8 under an initial compression in such assemblies in order to increase the eciency of such blocks. The provision of the exible core 4 and the flexible shell 7 permits a building up of this initial compression in the resilient material 8 at the time of `assembly of the block in the de? sired device. 'Ihe use ofa bolt or similar means having a slightly larger outside diameterthan- 'the insidediameter of the hole inthe core 4,

holds the bolt .securely in the core 4 andprevents' a turning of the bolt in the core 4, or a creeping of the core 4 on the bolt. l f From the foregoing, it will be observed' that the resilient material 8 is not subjected to any straits other than compression anddistortion strains due to changes in the relative positions of the linner core 4 and the outer shell "1. This elimithe invention, and I do not wish to be limited to the precise details of construction as herein set forth, but desire to avail myself of all changes within thescope of the appended claims.

Having thus described my invention, what I claim is new and desire to secure by Letters Patent of the United States, is:-

1. A rubber block adapted to be disposed between connected members and comprising a body of resilient rubber, reenforcing lmeans embedded therein and providing an outer shell portion and an inner core portion, said reenforcing means vcomprising a plurality of layers of spirally wound yieldable but substantially non-resilient mate rial incorporated lin the outer surface and central portions of the block thereby eliminating the concentration of stresses incident to surface bonding between a rigid reenforcing means and the body of the rubber.

2. A rubber block adapted to be disposed between connected members` and comprising a body of resilient rubber, reenforcing means embedded therein and providing an outer shell portion, said reenforcing means comprising a plurality of layers of yieldable but substantially non-resilient material incorporated in the outer surface of the block, said layers being movable relative to each other thereby eliminating the concentration of stresses incident to surface bonding be-v tween a. rigid reenforcing means and the bod ofthe rubber.

3. A rubber block adapted to be disposed between connected members and comprising a body of resilient rubber having a centrally disposed orifice therein, reenforcing means embedded'in the body of the rubber adjacent said orifice and providing a reenforcing inner core portion surrounding said orice, said reenforcing-meansV comprising a plurality of layers of wire mesh material incorporated in therubber forming the body portion of the block so as to permit relative movement between the layers of material thereby eliminating the concentration of stresses incident to surface bonding between a rigid reenforcing means and the body of the rubber.

4. A bushing comprising a` substantially cylindrical block of rubber, reenforcing means incorporated in the outer surface and central portion thereof and forming substantially cylindrical shell and core portions respectively, said reenforcing means comprising a plurality of layers of perforate substantially non-resilient material secured to intermediate layers of rubber forming a continuationof said cylindrical block of rubber whereby the concentration of stresses incident to surface bonding of the rubber and a solid reenforcing member is eliminated.

5. A bushing comprising a substantially cylin drical block of rubber, reenforcing means incorporatedin the outer-surface and central portion thereof and forming substantially cylindrical shell and core'portions respectively, said reenforcing means comprising a' plurality of layers of perforate substantially-non-resilient material secured to intermediate layers of rubber forming `a continuation of said cylindrical block of rubber whereby the concentration of stresses incident to surface bonding of the rubber and a solid reenforcing member is eliminated, said cylindrical block of rubber having grooves in each end thereof intermediate said core and shell portions and of such depth as to provide a substantially constant mass'pf rubber in the body Anf the bick at points therein where vthe strains incident td the working of the block are imposed thereon. 150

6. A rubber bushing having a body of resilient rubber, reenforcing means incorporated in the central portion and outer surface thereof, said reenforcing means comprising a.plura1ity of layers of perforated material'secured to intermediate layers of rubber forming a continuation ofV said body of rubber wherebylocalization of stresses `incident: torthe surface bonding of rubber to a rigid reenforcing member is eliminated.

7. A rubber bushing having a body of resilient FREDERICK GUY.