US2404611A - Booster ram adjustment - Google Patents

Description

J11!ly23,.1946. BDASHBAUGH I I 2,404,611

BOOSTER RAM ADJUSTMENT I Filed March 9, i945 INVENT OR 2 BY f "ATTORNEY Patented July 23, 1946 UNITED STATES BOOSTER RAM ADJUSTMENT Bernard D. Ashbaugh,

Mount Gilead, Ohio, as-

signor to H-P-M Development Corporation, Wilmington, Del., a corporation of Delaware- Application March 9, 1945, Serial No. 581,827

7 Claims. 1

This invention relates to fluid operable presses and, particularly, to fluid operable presses having a reciprocable main ram and a. booster ram.

It is often desired to close the movable platen of a press against the fixed platen at a rapid rate and thereafter toperform work with it at a reduced rate. This is often accomplished by means of a booster ram which is generall fixed in the head of the press and extends into a bore in the main pressing plunger. Then, the fast movement of the platen is accomplished by admitting fluid to the booster area While the reduced speed pressing stroke is accomplished. by admitting fluid to both the booster ram and the main ram.

In order to accommodate for different lengths of fast travel, means are provided for accomplishing the admitting of pressure to the main plunger at a predetermined point in the travel of the press platen. This is commonly accomplished by means of valving operated by the press platen I and operable to interconnect the said areas. The necessary conduits and valves to accomplish this shift-over of pressure are expensive and require time and labor to install on a press. Furthermore, the additional hydraulic connections are subject to failure and require care and service to maintain them in good operating condition.

It is a primary object of the present invention to provide in a press having a booster ram a means of shifting over from the fast closing stroke to the pressing stroke which does not involve extra valves.

It is another object to provide an arrangement according to the foregoing object in which the length of the fast closing stroke may be adjusted.

It is still another object to provide an arrangement according to the foregoing objects in which the adjusting means for the booster ram is readily accessible.

It is still another object to provide a booster ram and adjustment therefor for an upward acting press plunger in which the adjusting means is readily accessible. 7

These and other objects and advantages will become more apparent upon reference to the accompanying drawing, in which:

Figure 1 is a vertical section through an upward acting press plunger having a booster ram and adjustment according to this invention;

Figure 2 is a similar view but showing the press in its closed position; and

Figure 3 is. a plan view taken on the line 3-3 of Figure l and showing a portion of the mechanism.

Referring to the drawing, there is shown a press platen I adapted to slide vertically on the strain rods I 2 and I4 and having connected therewith the ram I6 which has a piston I8 on its opposite end which is reciprocable within the cylinder 26.

The cylinder 26 comprises a flanged member adapted for being received within the bed plate 22 of the press base 24; The bed plate 22 is suitably connected with the strain rods I2 and I4 so that a rigid structure results. 7

The ram I6 is bored as at 26 and reciprocably receives a booster ram 28 which is bored'and threaded at 30 for receiving the threaded rod 32 which is rigidly attached to the closed end of the cylinder by means of the shoulder 34 an nut 36. y 7

The ram 28 is provided with a plurality of axial bores 38 which communicate the bore with the upper end of the bore 26. is connected by means of a plurality of inverted L shaped passages 40 with the space :beneath the piston I8. Fluid communication is thus had at all times between the upper end of the ram 28 and the bore 30 and, when the ram I6 advances upwardly a predetermined amount, between the upper end of the bore 26 and the lower endof the cylinder 20.

The ram 28 is also bored centrally for receiving a rod 42 which is slidably keyed to the said ram by a key 44. The rod 32 passes upwardly through the packing 46 and extends into a recess 48 in the platen ID. Attached to the upper end of the rod 42 within the recess 48 is a bevel gear 50 which is engaged by the bevel gear 52 on' the inner end of the rod 54. The rod 54 is jo'urnalled on the spaced bearings 56 and has a hand wheel 58 attached thereto externally of the platen I0.

Fluid communication is had with the upper side of the piston I8 through the conduit 60 while a check valve 62 is adapted to permit fluid to pass from the frame or reservoir 24 into the lower end of the cylinder 20 through the passage 64.

A valve 66 is also connected with the lower end of the cylinder 20 and is adapted to connect the cylinder 20 with the reservoir in response to a predetermined pressure conducted thereto by the conduit 68 which is connected with the upper surface Of the piston I8.

Pressure fluid is delivered to the booster plunger through a bore 10 in the threaded member 32 which communicates through a bor I2 with a conduit M.

In operation, pressure fluid is delivered to the conduit I4 while the conduit 60 is connected with exhaust. The fluid from the conduit 14 passes through the bores 72, I0, 30 and 38 to the upper end of the bore 26 and advances th plunger I6 and platen It rapidly into position where the members 16 and I8 are about to close. Im-

mediately prior to the closing of the said members the bores 40 communicate with the space above the booster ram and pressure fluid is delivered to The bore 26 in turn:

the lower surfac of the piston H3. The ram and platen then advance the member 16 against the member 18 at reduced speed and increased pressure. 7

Should the members 76 and 18 be replaced by other work members having different dimensions,

the hand wheelfili may be adjusted so that the.

T ram and extending through said mainram and booster ram 28 is rotated and threads in one" direction or the other on the member 32. This While this invention has been'illustrated' and 7 described in connection with an upward acting press ram, it will be understood that its utility is not limited to that type of press but may be employed on a horizontally or vertically acting press I ram as well. It will be understood that I desire to comprehend such modifications as may be considered to come within the scope of the appended claims. I

I claim:

1. In combination in a fluid operable press, a platen, a main ram attached thereto for reciproeating the same, a booster ram for augmenting the speed of said platen in one direction of movement thereof, means of admitting actuating fluid to said booster ram, means responsiVe to a predetermined relative movement of said rams to connect said rams hydraulically, and means carried by said platen and extending through said main ram and into engagement with said booster ram for adjusting the position thereof relative to said main ram.

2. In combination in a fluid operable press, a platen, a main ram connected with said platen for reciprocating the same, a booster ram extending into said main ram for augmenting the speed of said platen in one direction of movement thereof, means for admitting actuating fluid to said booster ram, means responsive to a predetermined movement of said main ram and platen for admitting actuating fluid to said main ram, and means carried by said platen and extending through said main ramfor adjusting the position of said booster ram relative to said main ram.

3. In combination in a fluid operable press, a reciprocable platen, a main ram attached'thereto for reciprocating ,the same, a cylinder within which said main ram is reciprocably mounted, a booster ram adjustably carried by said cylinder and extending into said main ram, means to admit actuating fluid to said booster ram, passage means in said main ram adapted in response to a predetermined advancing movement of said main ram to effect fluid communication between said rams, and means carried by said platen and extending through said'main ram for axially adjus'ting said booster ram.

4. In combination in a fluid operable press, a platen, a main ram attached to sai laten, a cylinder within which said main ram is reciprocable, a bore in said main ram opposite said platen, a booster ram screw threadedly carried by said cylinder and extending into said bore, means to admit actuating fluid to said booster ram, passage means in said main ram for effecting fluid comsaid platen.

5. In combination in a press, a platen, a cylinder, a main ram reciprocable in said cylinder for reciprocating said platen, a bore in said main ram, a booster'plunger' reciprocably mounted in said bore, a threaded bore in said booster ram, a threaded rod carried by said cylinder and extend ing into said threaded bore, means to admit actuating fluid to said booster ram, passage means in said main ramfor effecting fluid communication between said rams in response to a predetermined relative movement thereof, and means for axially adjusting said booster ram for changing the amount of said predetermined relative movement comprising a shaft extending axially through said main ram slidably keyed to said booster ram and a shaft extending transversely through said platen and in operative engagement with said first mentioned shaft.

6. In combination in an upward acting fluid operable press, a press bed, a press cylinder carried by said bed, amain ram reciprocable in said cylinder, a platen carried by said main ram, a bore in the lower end of said main ram, a booster plunger reciprocably mounted in said bore, a rod carried by said cylinder and screw threadedly engaging said booster ram for supporting the same, passage means in said main ram for effecting fluid communication between the advancing areas of said rams in response to a predetermined advancing movement of said platen and main ram, means for admitting actuating fluid to said booster ram comprising passage means in said cylinder, said rod and said booster ram, and means for axially adjusting :said booster ram relative to said main ram comprising a first shaft slidably keyed to said booster ram and extending axially through said main ram and into said platen, a second shaft geared to said first shaft and extending laterally outwardly through said platen,- and means for rotatingsaid' second shaft whereby said booster ram may be threaded in either direction on its supporting rod.

'7. In combination in a press, a press platen, a main ram attached thereto, a bore in said main ram'opposite said platen, a booster ram reciprocably mountedin said bore, a threaded recess in the endof said booster ram, a stationary threaded rod adapted for engaging said threaded recess thereby to support said booster ram, means extending through said rod and boosterrarn to supply actuating fluid to said booster ram, passage means in said main ram for effecting fluid communication between said rams in response to a predetermined relative movement thereof in the advancing direction, and means for rotating said booster ram relative to said rod to'eflect axial shifting of said booster ramcomprising a' first shaft slidably keyed to said booster ram and extending-axially through said main ram and into said platen, a recess in said, platenfor receiving the end of said first shaft, a second shaft extending laterally through said platen and into said recess, gear means connecting said shafts and hand Wheel means connected with the outer end of said second shaft whereby rotation thereof is effective to rotate said booster ram and, therefore, axially to shift the same.

' BERNARD D. .ASHBAUGH.

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