US2755147A - Press construction - Google Patents

Description

July 17, 1956 ',w. ENST l PRESS vcmsfr'Ruc'rIoN l original Filed sept. 15, 1949 FIG-l1 INVENTOR l WALTER ERNST BY, jf/214.4

ATTORNEYS July 17, 1956` v1/,ERNST y 2,755,147 y'PRESS CONSTRUCTION Y original Filed sept. 15, 1949 s sheets-sheet 2 FIG-2 INvE NTOR v WALTE R E R N ST AT TORNEYS July 17, 1956 f w. ERNST 2,755,147

PRESS CONSTRUCTIONv l f original Filled sept. 15, 1949 i s sheets-sheet :s

n S :if I @k l FIG-5 INVENTOR WALTER ERNST N ,-1

ATTORNEYS United States Patent O PRESS CONSTRUCTION Walter Ernst, Dayton, Ohio, assgnor to The Commonwealth Engineering Company of Ohio, Dayton, Ohio, a corporation of Ohio Application December 30, 1950, Serial No. 203,664, now Patent No. 2,730,981, dated January 17, 1956, which is a division of Serial No. 115,901, September 15, 1949, now Patent No. 2,672,836, dated March 23, 1954. Divided and this application August 13, 1952, Serlal No. 304,069

2 Claims. (Cl. 308-3) This invention relates to presses, especially to hydraulic presses, and particularly to the platen bearing guides thereof, and is a division of my co-pending application Serial No. 203,664, filed December 30, 1950, now Patent No. 2,730,981, issued January 17, 1956, and which is, in turn, a division of my co-pending application Serial No. 115,901 filed September 15, 1949, and issued March 23, 1954, as U. S. Patent 2,672,836.

In presses, particularly large presses, such as hydraulic presses, severe loads are imposed on the press platen at times tending to deflect it laterally or to cause it to tilt. For restraining the press platen against such deccting or tilting movements guide means are provided slidably guiding the press platen along the uprights or side frame members of the press. Usually these guide means consist of machined ways on the side frame members or uprights of the press which are engaged by simple gib elements bolted on the corners of the platen.

Due to the necessity of accurately guiding the press platen, and resisting the deecting and tilting forces enclosed therein during the operation of the press, considerable wear of the way surfaces will take place when they are formed directly on the side frame members or uprights of the press.

Also, these same forces that are exerted on the platen have a tendency to displace ordinary gib members, and which displacement will cause the platen to be inaccurately guided.

Having the foregoing in mind, a particular object of this invention is the provision of improved guiding means for press platens which will accurately guide the platen throughout its travel during operation of the press.

Another object is the provision of a guide means for a press platen which can readily be replaced if it becomes worn beyond allowable limits.

A still further object of this invention is the provision of a platen guiding means in which the guide ways and the gib members cooperating therewith can be fabricated separately from the press frame and platen whereby the most advantageous material can be used in their construction and the highest degree of accuracy in their manufacture maintained.

lt is also an object to provide an improved guiding means for the platen of the press which is better able to withstand detlecting loads on the press platen and which is easy to construct and install in the press.

These and other objects and advantages will become more apparent upon reference to the following description taken in connection with the accompanying drawings, in which:

Figure 1 is a front elevational view of a press constructed according to my invention;

Figure 2 is a plan section through the press platen and frame and is indicated by line 2 2 on Figure 1;

Figure 3 is still another plan section through the press at the level of the blankholder platen and is indicated byline 3--3on Figure l.

Figure 4 is an enlarged view taken through one corner of the press platen and the adjacent corner of the press frame showing the gib guiding arrangement for the platen according to this invention; and

Figure S'is a view similar to Figure 4 but showing the guiding arrangement for the blankholder platen.

Referring to the drawings somewhat more in detail, a press constructed in accordance with this invention comprises a bed 10 and a head 12 spaced apart by the uprights 14. Extending through uprights 14 are strain rods connected to the ends of which are nuts by means of which the head, bed and uprights are clamped together.

Reciprocably mounted in cylinder of the press which is in the head 12 is a press ram 40 that extends out through the bottom of the cylinder through suitable packing for connection with the press platen 44, as by a split ring, or other conventional fastening means.

The construction of the press platen will best be seen in Figure 2. The platen comprises a cast member having ledges 72 formed in its front and back faces and also having the notches 74 formed in its corners. The notches 74 are for the purpose of adjustably receiving the gib members 76. These members 76 are L-shaped with the ends of the legs at the sides of the platen bevelled off, as at 78 to bear against the press guides 80.

Gib members 76 are clamped tightly against a machined surface on the side of the platen by screws 82 which extend through clearance holes in the corners of the platen. The gib members 76 are adjustable toward and away from the guides by means of the set screws 84 extending through the gib members from the front and bearing against one face of the notches 74, and the screws 86 extending through the gib members and into the said platen.

It will be apparent that the combination of the screws 82, the abutment screws 84, and the clamp screws 86 provides a ready means for positively determining the location of the gib members 76 on the platen. It will also be noted that there are substantially no twisting forces exerted on any of the said locating means for the gib members or on the gib members themselves, but that any thrusts that are imposed on the said gib members due to impending deflections of the platen are carried by the gib members or the fastening means therefor purely in tension or compression.

It may be pointed out at this time that the guides 80 are mounted on the uprights of the press by means of the tongue and groove arrangement which will be best seen at 88 in Figure 4. The groove in the upright can readily be formed by simple machining processes, and the tongue on the guide can also be formed thereon in a very simple manner.

The guides are preferably of hardened steel, surface ground, and may either be manufactured or purchased commercially at a reasonable cost. The grooves run the full length of the upright, but the guides are cut otf, as indicated at 87 in Figure l, the correct length to give any required daylight and stroke combination. Thus, there is no pattern change or redesigning of the press necessary in changing the stroke-daylight' relationship. Screws 90 may be distributed along the guides for clamping them tightly in position against their associated uprights.

It will be noted in Figure 2 that the platen 44 has extensions 92 thereon extending into the space between the guides 80. These extensions are utilized for providing a positive stop for the platen by locating stop blocks on the bed in the space between the guides. The platen is designed to sustain the full tonnage of the press,

and the stop blocks and projections 94 on the platen thus represent an inexpensive and effective arrangement for providing a positive stop for the platen and ram.

ln many instances it is necessary to supply a press of the type illustrated with a blankholder arrangement for holding a blank during a drawing operation. The blankholder arrangement comprises a blankholder platen 150 positioned beneath the main platen 44 and suspended therefrom by the pick-up rods 152 which pass loosely through bored holes in the ledges at the front and back faces of the main platen. Platen 150 has a central opening 151 to admit a punch or the like to be carried by the main platen for action on the center part of a blank, the periphery of which is to be engaged by the blankholder platen. A

The blankholder platen is generally stationary while it is working and, therefore, does not require the heavy gib arrangement already described in connection with the main platen. Rather, the blankholder platen is so shaped as to extend along the diagonal faces of the guides 8O and engagement of the blankholder platen with the said guides is accomplished by means of the relatively thin wear plates 154 bolted on the diagonal faces of the blankholder guide surfaces so as to bear directly on the diagonal faces of the guides 80.

According to a phase of my invention, which is disclosed more fully in the above-identified co-pending application, the usual arrangement for actuating the blankholder platen from above is completely eliminated, and instead there are provided cylinders and pistons detachably mounted in the press bed and having upwardly extending rods connected with the blankholder platen so as to pull it downwardly with the proper amount of force.

The blankholder actuating arrangement is fully disclosed in my co-pending applications referred to above and includes the vertically extending pull down rods 168 which pass through suitable bores in the press bed into engagement with the blankholder platen 150 to pull the blankholder platen downwardly when the press is operated.

It will be understood that this invention is susceptible to modification in order to adapt itto different usages and conditions, and, accordingly, it is desired to comprehcnd such modifications within this invention as may fall within the scope of the appended claims.

Iclaim:

l. In an upright press having a head, a bed and a pair of spaced uprights extending between said head and bed, said uprights having inner sides confronting and vertically extending portions of said confronting sides being fiat and parallel to each other, said parallel portions having grooves parallel to cach other and running vertically the full length of said uprights, a platen reciprocable between said uprights toward and away from said bed, there being wear plates on the edges of said platen adjacent said uprights, each of said wear plates being mounted on said platen with a face thereof being inclined and directed inwardly of said press, guide rails having tongues fitted into said upright grooves and mounted on said uprights, each of said guide rails having a surface inclined with respect to the parallel portion of its respective upright and facing outwardly of said press, said inclined guide rail surfaces slidably engaging the corresponding inclined wear plates on said platen, and means adjacent said inclined surface of each guide rail and passing through the guide rail and the tongue thereon and received in respective upn'ghts to detachably secure said guide rails to said uprights.

2. In an upright press as claimed in claim 1 with the length of said guide rails being less than the length of said grooves whereby the position of said guide rail with respect to said bed and head may be varied.

References Cited in the tile of this patent UNITED STATES PATENTS 1,834,386 Derby Dec. 1, 1931 1,966,925 Criley July 17, 1934 2,111,096 Fritzsch Mar. l5, 1938 2,491,384 MacMillin et al. Dec. 13, 1949 2,582,889 Sedgwick Ian. 15, 1952

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