US1843971A - Hold-in mechanism for magnet valves - Google Patents

Description

Feb. 9, 1932.

R. D. CONKLiN HOLD-IN MECHANISMJOR MAGNET VALVES Filed Nov. 14. 1950 INVENTORQI Roscoe 0. Con K Iun.

3v /7)s ATTORNEYS. 4 S

Patented Feb. 9, 1932 warren stares Parser ROSCOE D. CONKLILL F RAHWAY, NEW JERSEY, ASSIGNOE TO NATIONAL PNEUMATIC COMPANY, OF Yonnn. Y., A CORPORATION OF WEST VIRGIE' IA HOLD-IN MECHANISM FORIEAGINETVALVES Application filed. November 14 1930. Serial No. 495,801.

This invention relates in general to means for holding magnet valves and the like after operation in operated position.

One of the objects of this invention the provision of simple mechanical means not ing upon an operable member to hold it in operated position after having been "moved to opera-ted position. 7

A further object of this invention is the provision of electro-magnetic means for releasing the hold-in mechanism to permit the operated member to return to normal position.

A further object of this invention is the provision of simple mechanical means for accomplishing these purposes.

A still further object of this invention is the provision of mechanism of this type which will compensate for or talte up any wear that may occur on the operating parts.

A still further object of this invention is the provision of mechanism of this type which even as it wears will insure that the operated member will remain in fully operated posi- 1 tion after having been moved'to it.

A still further advantage of this construction is the tact that it is positive in action and is particularly etlicientvihen used in connection with operable members which have but a very short distance to move from inoperative to operative position. These and other ob ects, as will appear from the following disclosure are secured by means of this invention.

This invention resides substantially in combination. construction, arrangement, and

- relative location of parts, all as will be forth in greater detail below.

Referring to the drawin gs Figure 1 is a vertical cross-sectional view through the device of this invention as applied to an eleotromagnetically opt-rated valve; and

Figure 2 is a cross-sectional view taken on the line 22 of Fig. 1.

At the outset it is desired to emphasize the fact that this invention is in no sense limited in its application to magnet valves since it will be apparent from the following description that it may easily be applied to any member which is moved from inoperativeto operative position andrwhich it is desired to hold in operative position until released. Broadly, the general purpose of this inven tion is theprovision of simpleinechanical means acting upon the operating member of a 'valve, shown as operated by eleotro-inagnetic means but not necessarily limited thereto, to hold it in operated position as long as desired, and electro-magnetic means for releasing it when desired. The construction employed will be-understood bydetail reference to the drawings. V

The casing of the electro-magnetic valve is shown at 1 within which is mounted the solenoid winding 2. At 3 is a fixed. pole piece of the solenoid winding through which slidably operates the rod 4, which may be the valve stem or the member by means of which the valve stem is operated. In contact with this rod 4; is a movable plunger 5 which slides centrally of the solenoid winding. Mounted upon casing 1 are the uprights or standards 6 which support a plate 14 and a: second casing 7. Within this casing 7 is another solenoid winding 8 having the fixed central pole piece 9 and a movable plunger 10. Secured to the movable plunger 10 and having a sliding central lit with the pole piece 9 is a knockout' pin 11 having an enlarged head 11'. Supported on the top of casing 7 is a bracket 12 to which .is adjustably secured the upper end of a spring 18 which has its lower end anchored to the plunger 10.- Depending from the under surface of plate-14 are'two sets of parallel converging arms 15 which form supports for pins 16 which extend between -them. Pivotally mounted on these pins 16 are two bell crank levers each comprising the connected arms 17 and 18. At 19 is a spring anchored to each arm 18 and tending to draw them towards each other. The free ends of arm 17 lie parallel to each other and directly under the enlarged head 11" of the knockout pin 11. The relative arrangement of arms '15 and the bell crank arms is clearly shown in Fig. 2.

When winding 2 is energized plunger 5 iii) moves down carrying with it the valve stem I or rod 4:. -This causes the valve or other mechanism operated by the rod to be moved to its operated position. As soon as plunger 5 begins to move down spring 19 draws arms 18 toward each other eflecting sliding contact of their inner curved cam surfaces over the upper end of plunger 5. Thus for every bit of movement that plunger 5 undergoes the arms 18 closely follow it and it is apparent that this action will occur even though the contacting surfaces wear. When it is desired to return the operated member, such as the valve, to normal position it is only necessary to energize solenoid 8 for a short time. As a result plunger 10 is attracted by pole piece 9 and the knockout pin is thrust downwardly to cause its enlarged head 11 to strike the upper ends of arms 17. This causes the arms 18 to move apart, tensioning spring 19, and permitting plunger 5 to move upwardly. It is pointed out that the valve operated by rod 4: and plunger 5 are urged (with respect to the drawings) upwardly by a spring (not shown) which is always tending to operate the movable parts to normal position. Hence as soon as the arms 18 move outwardly to release plunger 5 it springs back to normal position.

With the above disclosure it will be apparent that this invention resides in certain principles of operation which may be embodied in other physical forms without departing from the spirit and scope of this invention. 1 do not, therefore, desire to be strictly limited to the disclosure as given for purposes of illustration but rather to the scope of the appended claims.

What I seek to secure by United States Letters Patent is:

1. In a hold-in mechanism or" the type described the combination comprising a valve stem, electro-magnetic means for moving said valve stem, a pair of pivoted arms, a spr'ug urging said arms towards each other .11 contact with the end of the valve stem, a knockout pin for engaging said arms to move them apart to release said valve stem, and electro-magnetic means for moving the knockout pin.

2. A hold-in mechanism for valves comprising in combination a valve stem, electromagnetic means for operating the valve stem in one direction, a pair of pivotally supported bell crank levers arranged to engage the valve stem, a spring for causing the bell crank levers to engage the valve stem, and electro-magnetically operated means engageable Vitll the bell crank levers for rotating hem against the tension of said spring to free the valve stem.

3. A hold-in mechanism for valves comprising in combination, a valve stem, electromagnetic means for operating the valve stem in one direction, a pair of pivotally supported hell crank levers arranged to engage the valve stem, a spring for causing the bell crank levers to engage the valve stem, the ends of the bell crank levers engaging the valve stem having curved surfaces, a knockout pin for engaging the bell crank levers, a solenoid having a pole piece, a plunger connected to the knockout pin, and means for holding the knockout pin and plunger in normally retracted position.

l. in a mechanism of the type described, the combination comprising two solenoid windings in axial alignment, a pole piece for each solenoid winding, a plunger for each pole piece attractable thereby, a member operated by one of the plungers and intended to be held in operated position, spring urged pivoted arms for engaging that plunger, and a knockout pin connected to the other plunger and adapted to strike the bell crank levers when its solenoid is energized, said spring urged arms acting to hold the plunger engaged thereby and the member actuated thereby in operated position.

5. In a mechanism including a valve stem resiliently held in one position, the combination comprising electro-magnetic means for moving the valve stem, pivotally supported bell crank levers and a spring causing them to engage said means to hold it in operated position, a slidable plunger and knockout pin for engaging the bell crank levers to move them out of engagement with said means, and electro-magnetic means for moving said plunger.

6. A mechaism of the type described comprising a movable member, electro-magnetic means for moving the member, a plurality of pivotally supported arms having cam surfaces which engage the member, a spring for insuring positive engagement between the arms and the movable member, and electromagnetic means for moving the arms against said spring to permitthe movement of said movable member in one direction, said spring insuring continuous contact between the arms and the movable member in its movement in one direction to compensate for wear.

In testimony whereof I have hereunto set my hand on this 6th day of November, A. D.

ROSCOE D. CONKLIN.

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