US2230288A - Hydraulic press - Google Patents

Description

Feb. 4, 1941.

' R. w. DlNZL. HYDRAULIC PRESS Filed Aug. 4, 1939 2 Sheets-Sheet 1 I l I I l ATTC FIN EY Feb. 4, 1941. R. w. DINZL HYDRAULIC mass File'd Aug. 4, 1939 2 Sheets-Sheet 2 INVENTO R MardWfiUgZ B ATTORNEY Patented Feh 4 1911 uNiTEo sures.

PATENT HYDRAULIC PRESS Richard W. Dinzl, Westfleld, N. .l., assignor to The Watson-Stillman Co., Roselle, N. 5., a corporaticn of New Jersey Application some 4,

4- Claims.

piece so shaped as to dispose the load or stress of the work resistance off-center with respect to the press heads or platens operating upon the work. Inthat case the powerful ofi-center stress sometimes cants a press head slightly, with con sequent damage to the dies, the work. or both. Methods of correcting this defect have been proposed but heretofore they have involved complications in the press structure which are objectionable in operation and add materially to the cost of the press. I i

Animportant object of the present invention is to provide simple, inexpensive and entirely satisfactory means for preventing the said tilting of a press head under-the stress of oil-center work resistance.

Other objects of inafter. 4

In the drawings; Fig. 1 is a vertical sectional view of a press embodying the invention, the section being on the line l-.-i of Fig. 3;

Fig. 2 is an enlarged detail vertical section on the line 2-2 of Fig. 4;

Fig. 3 is a side view of the pres;

Fig. 4 is anenlar'ged horizontal section on the line 4- of Fig. 3; and

Fig. 5 is a view similar to Fig. 2, showing a modified form of the press head guiding means.

The invention is shown as embodied in a press having a fixed lower press head and a cooperating upper press head reciprocable vertically by hydraulic pressure.- The press includes a rigid frame whose structure comprises a lower tlBJlS-r verse frame member or base 1, columns 2 borne by the base, at opposite sides of the press heads,

'a transverse frame member-3 supported by the columns in a position above thepress heads, a

transverse frame member 4 spaced above the member 3, and four strain rods 5 to anchor together all of said parts of the frame.- Base l comprises a flat casting bearing upon its upper face a flat bolster plate 8 which forms in effect the fixed lower press head or platen. Each col-Q hold the latter against endwise displacement on IS the columns. Another pair'of keys 0 at right Often,

the invention will appear here-- A pair of was, SBli'iitiNfi. senses angles to the first pair are also inserted in keyways in said abutting surfaces and hold the member Sagainst sidewise displacement on the columns. At their lower ends the columns are similarly keyed to the base. The strain rods extend through holes in the base, the frame member'd and the frame member t and have nuts 9 screwed upon their upper and lower ends to anchor together all of the frame parts. Between the frame members 8 and 5, rigid spacing sleeves iii encircle the strain rods and support the memher t properly spaced above the member 3.

An upper press heador platen ii comprising a rigid casting is mounted for vertical reciprocaa tionbetween the columns 2. Between each column and the adjacent side of said press head there are guide means forvthe head. Each columnis formed with a pair of square corners adjacent the press head and basis, at said corners, rigid guide strips 52. Each of the latter is bevwhich faces obliquely inwardlytoward the press head. A-rigid flange M formed on the guide face l3. Between'said guide member and the face it there is fitted a companion wedge-shaped guide member in having a vertical guide face 2|.

slidably fitting againstthe faceie and an inclined. face 22 hitting against the inclined face of guide member iii. The latter member has a rounded protuberance is rotatably fitting in a rounded cavity 2% in the surface ii to enable the guide members to be accurately trued to the surface' it. Between said companion guiding members there is a screw connection 25 for vertically adjusting the member 2d guide face it, Above the press head ii and centered thereon cylinder is a hollow casting vertically arranged a and formed at its lower end with a base flange 21 which bears against the upperside of the press to accurately fit the 20 eled to provide it with a vertical guide face it c5 there is a hydraulic pressure cylinder 26. This I head II and is bolted thereto, as at 26, to make the cylinder and presshead a rigid, reciprocable unit. The cylinder casting is formed with a partition 29 at an intermediate point, and the por-,

upper end the plug is screw-threaded and has a nut 33 screwed thereon and bearing against an abutment surface on the member 4 around the upper end of the bore 3|. The plug has an axial bore 34 for admitting fluid pressure to the cylinder to act upon the partition 23 and force the cylinder and press head II downward on a work- -ing stroke. The bore 3| containing the reduced portion of the plug is preferably slightly larger than said portion to enable lateral adjustment of the plug to center it within the cylinder.

The cylinder casting 26 is much longer than the stroke of the press head I I and it extends upward through a vertical bore 35 in the frame member 3. This bore is materially larger than the cylinder casting and has fitted therein a rigid annular guide 36 for the cylinder. The bore of this guide and the peripheral surface of the its stroke.

cylinder are finished smooth and they have a snug sliding fit. At its lower end the guide has a flange 31 bolted to the under side 'of the frame I member 4, as at 38. Y

The cylinder guide '36, the cylinder casting 26, the press head guide members 20 and the fixed guide members I2 borne by the frame columns are so formed'and arranged that the most remote guiding points of the guide 36 andthe guides 20, that is, the highestpoint of engagement of the guide 36 with the cylinder casting and the lowest point of engagement of the guides 2li with the fixed guide surfaces I3, are spaced along the vertical line of reciprocation of press head I I a distance at least equal to the major dimension of the working face area of said press head. By working face area is meant the maxi: mum area practically available at the under face of the press for bearing a die for cooperation with a die on the companion-lower press head 6. The

guides 36 and 20 are of material length along the line of reciprocation, and the length of the guiding surface of the cylinder and that of the fixed guide surfaces I3 is such that theentire length of guide 36 and of guides 20 will be in guiding engagement with said surfaces respectively in all positions of the press head II along The means shown and described for guiding the reciprocable press head and cylinder unit will positively resist tilting of the press head under the stress of off-center work resistance due to non-symmetrical arrangement of the work with reference to the axial line of the press cylinder or the center of the press head. The wide spacing of the cylinder guide 36 from the guides 20 along the line of reciprocation provides the guide 36 cooperating dies thereon. Said means and the dies are here omitted from the drawings in order to simplify the illustration. For the same reason, means for supplying hydraulic pressure to the bore 34 delivering to the press cylinder, and

means for controlling the pressure in the cylinv der, are omitted from the drawings. I

For retracting or elevating the press head II the press is provided with the usual hydraulic pull-back cylinders .39 and pistons 40. Said cylinders are supported by the press frame memher 3, and the pistons are operatively connected by rods 4| to the press head I I. By admission of hydraulic pressure to the cylinders, at the under side of the pistons, the press head is raised. Any suitable means, not shown, may be employed to supply and control hydraulic pressure in the pull-back cylinders.

Fig. 5 shows another form of press head guiding means, simpler than that shownin Figs. 2 and 4, for cooperation with the fixed guides I2. A single guide strip 20 is fitted within each of the,corner channels I6 of the press head II, and is formed to fill the space between the bottom face of the channel and the fixed guide face I3.

What I claim is: I

. 1. In a press, the combination of a rigid lower press head, a transverse upper frame member and vertical side frame'members rigid with the transverse member, a vertically arranged-press head guiding means below the upper transverse member and located at the outer margin of the reciprocable head, a verticai press-cylinder rigid with the reciprocable press .head and centered thereon and extending upwardly from the upper surface thereof and through the said upper frame me'm-,

her and adapted to receive ,fiuid pressure, said 7 cylinder being smaller in diameter than the transverse dimension of the said reciprocable head, rigid annular means borne by said upper frame member and extending around said cylinder and having a long bearing on the exterior thereof, the cylinder extending through and above said guide means to guide the cylinder in its reciprocation with the upper press head; a fluid pressure reaction plug borne by the frame in a fixed central position above the said upper frame member and extending down into. the

upper end of the cylinder and along which the tances outward from the axis of the cylinder,

the guiding means for the press head being the lowermost'and at. the greatest distance outward from the cylinder axis and the uppermost of said guiding means being the shortest distance outward from said axis.

2. In a press, the combination of a rigid "press frame comprising a transverse lower frame member bearing a lower head, a-transverse upper frame member, and vertical side frame members rigid with the transverse members, a vertically reciprocable rectangular upper press head, vertically arranged press head guiding means below the upper transverse member and between the vertical frame members and located at the four corners of the reciprocable head the engaged faces of said guide means in horizontal section aasopsa pressure for moving both the cylinder and the upper head downward on a working stroke, said cylinder being smaller in diameter than the transverse dimension of the said reciprocable head, rigid annular guide means borne by said upper frame member and extending around said cylinder and having a long bearing on the exterior thereof, the cylinder extending through and above said guide means to guide the cylinder in its reciprocation with the upper press head; a fluid pressure reaction plug borne by the frame in a fixed central position above the said upper frame member and extending down into the upper end of the cylinder and along which the cylinder is slidable; annular fluid pressure retaining and rigid annular cylinder guiding means carried by the cylinder at the upper end thereof and between the cylinder and said plug, said fluid pressure retaining and cylinder guiding means being smaller in diameter than the said annular guiding means engaging the exterior of the cylinder, whereby the reciprocablepress head and the cylinder will be guided by three guiding means spaced apart vertically and located different distances outward from the axis of the cylinder, the guiding means for the press head being the lowermost and at the greatest distance outward from the cylinder axis and the uppermost of said guiding means being the shortest distance outward from said axis.

3. In a press, thecombination of a rigid press frame comprising a transverse lower frame member bearing a lower head, a transverse upper frame member, and vertical side frame members rigid with the transverse members, a vertically reclprocable rectangular upper press head, vertically arranged press head guiding means below the upper transverse member and between the vertical frame members and located at the four corners of the reciprocable head the engaged faces of said guide means in horizontal section being in planes approximately forty-five degrees to a vertical plane extending centrally and longitudinally of the press, adjustable wedge means between the vertical edges of the press head and the said vertical guiding means, a vertical press cylinder rigid with the reciprocable press head and centered thereon and extending upwardly from the upper surface thereof and through the said upper frame member and adapted to receive fluid pressure for moving both the cylinder and the upper head downward on a working stroke, said cylinder being smaller in diameter than the transverse dimension of the said reciprocable head, an annular means borne by said upper frame member and extending around said or!- inder and having a long bearing on the exterior thereof, the cylinder extending through and above said guide means to guide the cylinder in its reciprocation with the upper press head; a fluid pressure reaction plug borne by the frame in a fixed central position above the said upper frame member and extending down into the upper end of the cylinder and along which the cylinder. is slidable; annular fluid pressure retaining and rigid annular cylinder guiding means carried by the cylinder at the upper end thereof and between the cylinder and said plug, said fluid pressure retaining means being smaller in diameter than the said annular guiding means engaging the exterior of the cylinder, whereby the reciprocable press head and the cylinder will be guided by three vertically spaced guiding means located diflerent distances outward from the axis of the cylinder, the lowermost of said guiding means being the greatest distance outward from the cylinder axis and the uppermost of said guiding 20' means being the shortest distance outward from said axis. g

4. In a press, the combination of a rigid lower press head, a transverse upper frame member and vertical side frame members rigid with the transverse member, a vertically arranged press head guiding means below the upper transverse memthe vertical edges of the press head and the said vertical guiding means, a vertical'press cylinder rigid with the ,reciprocable press head and center ed thereon and extending upwardly from the upper surface thereof and through the said upper frame member and adapted to receive fluid pressure, said cylinder being smaller in diameter than the transverse dimension of the said reciprocable head, rigid annular means borne by said upper frame member and extending around said cylinder and having a long bearing on the exterior thereof, the cylinder extending through and above said guide means to guide the cylinder in its reciprocation with the upper press head; a fluid pressure reaction plug borne by the frame in a fixed central position above the said upper frame member and extending down into the upper end s' of the cylinder and along which the cylinder is slidable; annular fluid pressure retaining and rigid annular cylinder-guiding means carried by the cylinder at the upper end thereof and between the cylinder and said plug, said fluid pressure retaining and cylinder guiding means being smaller in diameter than the said annular guiding means engaging the exterior of the cylinder, whereby the reciprocable press head and the cylinder will be guided by three vertically spaced guiding means located different distances outward from the axis of the cylinder, the guiding means for the press head being the lowermost and at the greatest distance outward from the cylinder axis and the uppermost of said guiding means being the shortest distance outward from said axis. 4

RICHARD W. IDINZL.

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