US1960727A - Hydraulic toggle press - Google Patents

Description

y 1934- J. w. BRUNDAGE ,960,727

HYDRAULIC TOGGLE PRESS Filed July 14, 1932- (l tourney Patented May 29, 1934 UNITED STATES HYDRAULIC TO GGLE- PRESS James William Brundage, Akron, Ohio, assignor. to The Summit Mold & Machine Company, Akron, Ohio, a corporation of Ohio Application July 14, 1932, Serial No. 622,402

6 Claims. (01. 18-17) This invention relate to molding or vulcanizing presses, particularly those of, the general type disclosed in my Patent No. 1,895,603 of January 31, 1933, having press members mounted for relative rectilinear movements in parallelism and for relative tilting movements into and out of line.

One object of my invention is to provide a combined floating-ram and toggle press permitting the employment of a smaller ram cylinder for the same power. A further object is to provide an improved combination of those features in a press whose members have a combined relative reciprocating and tilting movement.

Of the accompanying drawing, Fig. 1 is a side 15 elevation, partly broken away and in section, showing a preferred embodiment of my invention.

Fig. 2 is a front elevation of the lower part of the press in open position.

Fig. 3 is a horizontal section on the line 3-3 of Fig. 2.

In the drawing, is a base to which are secured the lower ends of a pair of upwardly and rearwardly-inclined side frame-plates 11, said plates having aflixed to their upper ends an upper press head 13 occupying a backwardly-inclined position and fixedly carrying a steam-jacketed upper mold section 14, in this case adapted for vulcanizing inner tubes for pneumatic tires.

15 is the mating steam-jacketed lower mold section secured to a lower press head 16 to whose lower side is attached a pair of downwardly-projecting guide rods 17 slidable in guides 18 carried by a yoke-shaped rock-frame 19, the latter being pivoted upon fixed journal studs 20 on the side frames 11. The head 16 also has a pair of laterally-projecting journal pins on which are mounted rollers 21 which occupy cam slots 22 formed in the side frames 11 and each having a rectilinear upper portion 23 parallel with an axis at right angles to the division plane of the mold and a lower portion 24 inclined at an angle to said upper portion. The said portions serve respectively to guide the lower head and mold section during its reciprocating movement in parallelism with the upper head and mold section during the upper portion of said movement and in a swinging movement out of line with the upper head and mold section during the lower part of said reciprocating movement to and from the loading and unloading position represented in full lines in Fig. 1.

For reciprocating the lower press head 16, I provide on opposite sides of its central axis respective toggle units formed by double pairs of links 25, 26, 27, 28, constituting toggles which fold outwardly in opposite directions, the links 25 and 27 being pivoted at their upper ends by rods 29 and 30 to ears on the lower side of the head- 16 and the links 26 and 28 being pivoted at their lower ends by rods 130 and 31 on cars carried by the rock-frame 19.

32 is the cylinder of a double-acting hydraulic ram having a piston 33 and rod 33 constituting the ram plunger, said rod passing through a stuffing box in the inner head of the cylinder and connecting at its forward end with a rod 34 by which the adjoining ends of the toggle links 25 and 26 are pivoted together. The sides of the cylinder between the ends of the latter, carry a pair of trunnions 35 by which the adjoining ends of the toggle links 27 and 28 are pivoted together. By these connections with the toggle links the ram is carried in a floating manner by the respective toggle units and its longitudinal axis remains parallel with the plane of the lower head 16 and mold section 15 during the movements of these parts. The location of the pivots 35 between the ends of the cylinder 32 balances the ram and reduces the space occupied, longitudinally of the ram, substantially to the smallest dimensions for a given length of stroke. Suitable pipe connections 36, 37 are provided for carrying fluid pressure to and from the respective ends of the ram cylinder.

In the operation of this press, the lower parts being in the loading and unloading position represented in full lines in the drawing, the press is closed by admitting fluid pressure to the inner end of the ram cylinder 32 and exhausting the outer end of said cylinder. The ram piston is thereby moved toward the outer end of the cylinder, causing the inner end of said cylinder to advance and the rod 33 to retract, thereby moving toward each other the knuckle joints formed at the rod 34 and the trunnions 35. This moves the toggles toward their straightened positions, raising the lower press head 16, causing the rollers 21 to move up the inclined portions 24 of the cam slots 22, thus tilting the lower head and connected parts toward and into a position of parallelism with the top head and bringing the ram cylinder 32 into the inclined position represented in broken lines, the rollers 21 then entering the rectilinear portions 23 of the cam slots during the concluding portion of the upward movement until the lower mold section 15 meets the upper section 14. This is the position of greater mechanical advantage of the toggles as compared with the retracted position, but they do not quite reach a straightened condition when the mold is fully closed so that the ram pressure will follow up on the lower mold section through the toggles and keep the mold tightly closed during the vulcanizing operation. To open the press, fluid pressure is admitted to the outer end of the ram cylinder 32 and discharged from its inner end, thereby reversing the foregoing operations.

By imposing the power of the ram through the described toggle mechanism upon the lower press head, a powerful pressing action is obtainable with a ram of comparatively small diameter and by carrying the ram fioatingly on the toggle units, a very compact press of simple construction is obtained.

The movable lower parts of this press may be substituted in place of those disclosed in my aforesaid prior application, Ser. No. 497,637.

The particular arrangement herein disclosed is susceptible of rather wide variation without .departing from the scope of the invention as defined in the claims.

I claim:

1. A molding press comprising press heads mounted for relative reciprocating and tilting movements, toggle mechanism for imparting said movements, and a floating power ram carried by said toggle mechanism for actuating the latter.

2. A molding press comprising a pair of press heads of which one is movable and guided for reciprocating and tilting movements relative to the other, two oppositely-bending toggle units connected with the movable head for imparting said movements, and a floating ram comprising a power member mounted on one of the toggle units and having a rod connected with the other unit" for actuating said toggle units.

3. A molding press comprising press heads mounted for relative reciprocating and tilting movements, a pair of oppositely bending toggle units for imparting said movements by reciprocation of one of the heads, and a floating power ram carried by said toggle units for actuating the latter.

4. A molding press comprising a rocker, a movable press head slidable on said rocker and adapted to swing therewith, toggle mechanism interposed between said head and rocker, a floating power ram carried by said toggle mechanism for actuating the latter, and means actuated by movement of said head for swinging the rocker.

5. A molding press comprising press heads mounted for relative reciprocating and tilting movements, cam means coacting with a reciproeating one of said heads for relatively guiding them in such movements, toggle mechanism connected with the reciprocating head for actuating the latter, and a floating power ram carried by and adapted to operate said toggle mechanism. 6. A molding press comprising a reciprocating and tilting press head, cam means coacting with said head for causing the tilting movement by reciprocation of said head, a rocker slidingly carrying said head, a pair of oppositely bending toggle units interposed between said head and rocker, and a floating fluid-pressure ram having cylinder and plunger members respectively pivotally carried by the knuckles of the two toggle units.

JAMES WILLIAM BRUNDAGE.

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