US2798777A

US2798777A - Cylinder mount

Info

Publication number: US2798777A
Application number: US475614A
Authority: US
Inventors: Francis S Flick; Walter J Kudlaty
Original assignee: Flick Reedy Corp
Current assignee: Miller Fluid Power Corp
Priority date: 1954-12-16
Filing date: 1954-12-16
Publication date: 1957-07-09
Anticipated expiration: 1974-07-09

Description

July 9, 1957 F; s, FLICK ET AL CYLINDER MOUNT File'd DeG. 16, 1954 UnitedStates Patent O CYLINDER MOUNT Francis SaFlick, Oak Park, and Walter J. Kudlaty, Ellnhurst, Ill., assignors to Flick-Reedy-Corporation, a corporation of Illinois Application December, 1954, serial No. 475,614" 4 claims. (c1..s092) This invention relates to a mounting for a `piston and cylinder device and more particularly to a side or foot mounting of such character.

i Piston and cylinder devices may be mounted in various manner dependent upon the space 'availablev and the type of action which the cylinder is to accomplish. Some mountings are pivotal while other fix the piston and cylinder device in position relative to a base. The present inventionl is concernedwith the type of mountingsy referred to as side or foot` mountings which hold the cylinder immovable relative toa base.

Itis important that the mounting be rigid and permit keying of the cylinder against any movement. \A.desirable mounting. should. assume very little space and also be `of such form that the distance between-the mounting lbase and centerline of the cylinder is. ata` minimum. Bending of the cylinder head under load inthe direction of anyof its dimensions should. be avoided. The` location and form of the mountingmay have. a1dei-nite relation to and may minimize such bending or dellection under load.` The mounting lugs should `also be` as -close to each other as possible to minimize beam action betweenlugs on thecylinder head and mounting. At the same time, themounting shouldbe of such a character tha-tit may be attached tothe cylinder withoutdisturbing` the cylinder assembly or be readily interchangeablewith other and different mountings.` The `present invention provides anew mountingfwhichmeets these desired features set out above.

It is, therefore, the principal object of this invention to providea new and `improved mount for a piston and cylinder device.

A further object is to provide a side or foot typemountirl-g` Whichrnayl be secured as close as possible to the centerline ofthe cylinder.`

' Another object is to provide a side or foot mounting whichsubstantially minimizes `deflection in the'` cylinder under load.

Another object is to provide a detachable foot mounting for a cylinder that may lay within the longitudinal projection of the cylinder head or cap so as to retain both the minimum width and centerline heights of the cylinder without such mounting.

A further object is to provide a mounting which can be attached to the cylinder without substantially disturbing the cylinder assembly.

Other features, advantages and objects of the invention will be apparent from the following description taken in conjunction with the accompanying drawings in which:

Figure 1 is a side elevational view of a piston and cylinder device partially broken away to illustrate the cylinder mount of the present invention; and

Figure 2 is a sectional view taken substantially along line 2-2 in Figure l, with the base and fastener omitted and looking toward the lefthand end of the cylinder as indicated.

The piston and cylinder device to which the present 2,798,777 Patented July 9,. 1957 mounting is to be applied is either air or hydraulic, both of which are manufactured to very close machine tolerances. The cylinders are intended for continuous servieefor very long periods oftime without attention. The use of `the cylinder is quite prevalent in the machine tool field in applications requiring very accurate strokes, pressures and operation throughout long life.

The cylinder illustrated in the figures of the drawing includes a brass or. steel cylinder tube 3 mounted between a steel cap 4 and a similar head 5 closing the endsof the tube. A retainer plate 6 is placed adjacent the head and the whole assembly` is held together by tie rods 7 extending through the cap, head and retainer plate with appropriate nuts 8 and 9`on either end of the tie rods. Suitable seals are provided between the tube 3 and the head and cap. An adjustable cushion lilwhich may be in the form of a needle valve is shown at` each end of the cylinder along. with` a ball check 11 for obtaining quick release and returnof the piston Within the cylinder. A piston rod 12 is shown. as extending through the head 5 and is provided with a threaded outer end 13 and wrench flats 14. The piston Withi-nthe cylinder is not shown as it forms no part of the present invention. Fluid may be led intoeither end. of the cylinder through ports connected topiping'l and` 16. The device shown is thus a double acting piston although the invention is equally applicable to single acting piston and cylinder devices.

The mounting member of the present invention coniprises a one-piece lug which takes the place ot the ordinary nuts' 8 used onrthe'endof the tie rod 7. The lugs for any particular size of cylinder are interchangeable. Ordi* narily fourfmounting lugs are usedto secure a cylinder' inplace against a base support. Thus, the lugs would be attached to either end of the pair of tie rods on the side or` end ofthe cylinder.

The particular lugs, generally indicated 17, are generally square in cross section as shown in Figure 2 and include a nut portion 18 having a threaded bore i9 for tightening the nut portion upon the threaded end20 ot" upper; surface 24 and lower surface 2S are parallel and normal to the face 23 and the cross bore is normal these surfaces. These relationships are retained eventhough the nut portion 1S of the lug might be turned down to clear the bushing 28 on an oversized piston rod.

The heads of the cylinder are accurately milled to seat on a base 29. The present mount permits the milled surface to be held tightly against the base. The retainer plate 6 is usually about .0l0" less in width than the head 5. The lug is given a dimension such that it may be about 1m or .015" out of the plane of the @head 5 or cap 4 as the case may be. This insures that when a bolt 27 or other fastener is placed in the cross bore to hold the cylinder in place against a base 28 that the head and cap of the cylinder will be tightly held against the base sup* port. The present foot mounting also provides a shorter mounting length for a given size cylinder than was previously available. Formerly, clearance of the tie rod nuts required a longer foot mount and also one that elevated the cylinder from the base to obtain clearance for the nuts on the bolt and the normal tie rod nuts.

Referring particularly to Figure 2, it will be noted that a portion 26 of the mounting lug extends over the retainavea??? ing plate 6 a sufficient distance to be within the line of the cylinder tube 3. The force applied to the tie rod by tightening the mounting lug is thus directly in line with the cylinder tube. This avoids distortion and contributes to the rigidity of the mounting. Any action of the cylinder under load will be transferred to the mounting along the line of the tie rods. This line of action is substantially closer to the center line of the cylinder than has heretofore been accomplished with side or foot type of mountings. ln the past, mountings on the side of a cyl inder permitted a visible bending and movement of the cylinder under heavy loads. These side mountings being at the outer sides of the cylinder were farther from the center line of the cylinder and thus did not resist beam action as does the present mount. The present lugs are in part opposite the cylinder barrel and thus closer to the center line of the piston rod. Very little bending, if any, occurs when very high loads are placed on the cylinder resulting in no movement of the cylinder between adjacent mountings. Also, there is no beam action longitudinally between opposite ends of the cylinder since the milled heads are held firmly on a base support.

The present mounting is particularly advantageous in that it permits keying of the cylinder in place either at the head or cap end or simply with a bar placed against the outer end of the mounting lugs. Ordinarily, cylinders used where close tolerances are required are keyed in place to avoid any movement because of the tolerances between the fastener and the cross bore in the mounting lug. Such keying is usual practice with cylinders required for accurate work.

The mounting lugs require only one-fourth of a turn in any position to align the sides of the lug with the sides of the head or cap. In practice, it has been found that such oneafourth turn does not place a strain on the tie rod outside of the normal tolerance permitted. The mounting lug does provide a very convenient and readily adjustable means of mounting the cylinder. In operation, only the pair of nuts 8 and 9 need be removed from one tie rod at a time in order to attach the mounting. By following this procedure, the piston and cylinder assembly is not particularly disturbed. The mount has the added advantage of being interchangeable with other types of mounts as no special preparation of the cylinder or heads is required to attach the present mount. The usual tie rods are used to secure the mounting lugs to the cylinder and they may be later removed to substitute other mounts such as pivot or flange mounts.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, for some modifications will be obvious to those skilled in the art.

We claim:

1. A tie rod mounted piston and cylinder device secured against deflection due to load, comprising: a cylinder having a square head at each end and tie rods extending through the heads, a plurality of one piece lugs each hav 4: ing an internally threaded nut portion at one end fo tightening the lugs upon threaded ends of the tie rods against the adjacent cylinder head to hold the cylinder and heads together, each lug having a cross bore extending through the lug adjacent to said nut portion for receiving a bolt fastener to hold the attached cylinder device heads against a base, said cross bore being aligned longitudinally with its respective tie rod, said lugs having sides spaced slightly inwardly of the sides of the adjacent head to secure the head against the base and loads on the cylinder being transferred through the lugs to the base substantially along the line of the tie rods.

2. A foot mounted piston and cylinder device, comprising: a cylinder having heads and tie rods extending through the heads, each head having a Hat surface for supporting the cylinder upon a base; a plurality of tie rod mounting lugs each having a nut portion threaded upon fone end of the tie rods adjacent said at surfaces, a flat face on each lug for abutting the face of the adjacent head and a pair of parallel surfaces normal to said flat face, said lugs each having an opening extending through said parallel surfaces to receive a fastener to secure the device on the base, said openings being aligned longitudinally with the tie rods so as to position the securing fasteners relatively near the center line of the cylinder avoiding beam action under heavy loads.

3. A tie rod mount as specified in claim 2 wherein the lug is square in cross-section and is of a size substantially to align at least two sides thereof with square sides of a cylinder head, said sides of the lug being spaced inwardly of the sides of the cylinder head not substantially more than .015 inch.

4. A foot mounted piston and cylinder device, comprising: a cylinder having heads and tiev rods extending through the heads, each head having a at surface for supporting the cylinder upon a base; a plurality of tie rod mounting lugs each having a nut portion threaded upon one end of the tie rods adjacent said at surfaces, a at face on each lug for abutting the face of the adjacent head and a pair of spaced surfaces extending from said flat face generally in the direction of the tie rod, said lugs each having an opening extending through said spaced surfaces generally normal to the respective tie rods to receive va fastener for securing the device on the base, said openings being aligned longitudinally with the tie rods so as to position the securing fasteners relatively near the center line of the cylinder avoiding beam action under heavy loads.

References Cited in the file of this patent UNITED STATES PATENTS 1,609,772 Rank Dec. 7, 1926 1,820,269 Craig Aug. 25, 1931 2,332,786 Fairhurst et al Oct. 26, 1943 2,410,808 Christensen Nov. 12, 1946 2,424,800 Coverley et al. July 29, 1947