US1715327A - Quick-throw mechanism - Google Patents

Description

' May 28, 1929.

P. s. IVANHOFF QUICK' THROW MECHANISM Filed June 22, 1927 ffffofwfy Patented May 28, 1929.

Miata? 5 eric.

i" Vdi i PETER S. IVANHOFF, OF LOS ANGELES, CALFORNA, ASSIGNOR T WILLIAM B.

BASTIAN, TRUSTEE, OF LOS ANGELES, CALIFORNIA.

QUICK-THROW MECHANISM.

Application filed June 22,

My invention relates to quick-throw mechanisms and has for an object the provision of a novel mechanism of this type.

Quick-throw mechanisms are requiredl incubatore, electric stoves and appliances,

etc.

In quick-throw mechanisms previously produced it has been difficult to adiust the mechanism so as to accurately determine the point in the movement of the prime mover at which the quick lmovement of the control member would be caused. lt is a further object of my invention to provide a quick-throw mechanism in which this adjustment may be readily and accurately made.

In many of the quick-throw mechanisms in use at present gravity is depended upon to perform one or more ot the functions of the device so that it is necessary that it be disposed in a given position in order to work properly.

It is a still further object of my invention manifest in the followingl description and in the accompanying drawings, in which Fig. 1 is a diagrammatic view illustrating a thermostatic quick-throw gas valve incorporated in a hot water tank and embodying a preferred form of my invention.

Fig. 2 is an enlarged vertical section al'view taken on the line 2-2 ot Fig.I 1, and illustra-ting in detail the thermostatic quick-throw valve shown in Fig. 1. y

Fig. 3 is a fragmentary' view similar to Fig. 2 illustrating` the parts of the quickthrow mechanism in diderent positions.

1927. Serial No. 200,572.

F ig. 4 is a vertical sectional view the line 4-4 of Fig. 2.

Fig. 5 is a horizontal sectional View taken on the line 5-5 of Fig. 2

Referring specifically to the drawings, Fig. 1 shows a boiler tank 1() having `a water chamber 11 and a heating retort 12 connected to vthe upper and lower ends of the chamber 11 by pipes'l and 14. A gas burner 15 is disposed about the pipe 14 below the lretort 12 and bv heating the retort heats the water taken on in the chamber 11. Y

.A thermostaticallv controlled quick-throw gas valve is screwed into a lower wall 21 of the tank 10 so that a thermostatie element 22 of the valve 20 entends upward into the waterin the'chamber 11. rI he gas valve 20 has a vertical tubular body 25, the upper end of which is provided with externall threads 26 which are adapted to screw into ya suitable opening in the tank wall 21., and

internal threads 27 which are adapted to threadedly receive the lower end of a copper tube 28 of the thermostat 22.

1 The upper end of the tube 28 is closed by a vplug 29 which carriesa rod 80 extending downward through the tube 28 intothe tubularbody 25. The rod 3() has a point-'ed lower end 3l which engages with a' cam member 32 which comprises a bell crank 33 pivoted at 34 upon the body 25 and extends downward from the lower mouth ot the body where it is provided with a head 36 having a peak'- shaped cam surface 37. The engagement of .the lower end 31 of the thermostat rodBO with the cam member 32 iso center relativev to the pivot 34 so that downward movement of thethermostat rod causes the cam member 32 to swing' toward the right. A spring-38 connects the lower end of the Abell crank 33 to a side wall 39 of na quick-throw mechanism 2. The housing` 40 has a back wall 41 which cooperates with the side walls 39 to provide a gas chamber 42, access to which is had by removal of a cover plate 43 which is normally connected to suitable flanges provided on the side walls 39 by machine screws 44. Extending` outward from the lett-hand side wall' 39 f is a nipple 48 which is provided with internalf kthe chamber 42 which (is, foraminated to housing 4Q. which is provided upon the lower vend of the body 25, as clearly shown in Fig.

provide a gas passage 53 extending through the shell 49. A valve seat 55 is formed in the outer mouth of the passage 53. A valve stem 58 passes centrally through the spider 52 so as to be axially guided thereby. A valve head 59, here comprising a ball, is mounted on the outer end of the stem 58 and is adapted to be seated upon the seat 55 or raised therefrom by the sliding of the stem 58 in the spider 52. A pin 62 is provided in the inner end of the stem 58 and a spring 63 is cornpressedbetween the spider 52 and the pin 62 to hold the valve head 59 against the seat 55. v Y f An Velbow 65 connects with a gas supply pipe 66 and is threadedly secured in the outer end of the nipple 48 to furnish a supply of gas to the gas valve 50. Y When the cover plate 43 is in place the gas chamber 42 is a closed chamber from which gas may pass only by an opening 68 in the Vwall 41 which connects with a burner supply pipe 69 which leads to the gas burner 15. The housingwall 41 has a boss 7 0 which eX- tends inwardintothe chamber 42 directly below the connection o f the body 25 with the housing`40. The boss 70 is provid-ed with a cylindrical recess 71 in which a rocking pin 72 is rotatably received. The rocking pin 72 has a transverse hole 73 formed therein through which projects a stem 75 of a secondary cam member 76. The cam member 76 has ya forked head 77' mounted upon the upper end of the stem 75, the two arm's of the fork being perforated at opposite points to rotatablyreceive a rocking pin 78and a roller supporting pin 79, the roller supporting pin being disposed above the rocking pin 78. The rocking pin 7.8 is provided with a transverse internally threaded hole for a purpose to be described later. The roller pin 79 supports a cam follower roller which is'adapted to contact'the peak-shaped camsurface 37 of the primary cam member 32. A compression Yspring 86 is disposed about the stem 75 between the head 77 `and the rocking pin 72,

j this spring tending to urge the secondary cam member 76 upward towards the primary cam member 32. j. A control rod 90, as clearly shown in Fig. 2, is threaded at one end and is adapted to be screwed into and through the threaded transverse hole formed in the rocking pin 78. After having been threaded through this hole the projecting end of the rod 90 has a button 93 rigidly mounted thereon, the outer face of the button 93 being normally Vdisposed in contact with'the righthand end of the valve stem 58. The opposite end of the rod from the button 93thereof has a ball 94 rigidly mounted thereon, the ball 94 being provided with a transversely projectingpin 9.5. Y Y l A control rod actuating mechanism 98 is ymounted in one of the walls 39 substantially in alignment with and on the opposite side of the gas chamber 42 from-the gas inlet valve 50. The control mechanism 98 includes a cylindrical shell 100 internally threaded at its mouth and slotted longitudinally on opposite sides, the shell being of such size as to receive the ball 94, the opposite ends of the pin projecting into said slots. An eXterf 94 and the rod 90. The head 106 has a stemV 107 which projects outthrough a hole in a boss 109 provided in one of the walls 39, as

clearly shownk in Fig. 2. A manually operable wheel 112 is mounted on the outer end of the stem 107. A compression spring 113 disposed between the boss 109 and the wheel 112 stillly urges the stem 107 outward .so as to draw the shell head 106 into compressing relation with a packing washer 114 which is disposed about the steni107 adjacent to the head 106. The packing washer 114 thus forms a tight seal between the shell head 106 and the boss 109 and permits the shell 100 to be easily rotated by the wheel 112. The outer surface 118 of the button 93 may have a spherical form generated about the center of the ball 94 for a purpose'which will be made clear in the description of the operation.

The operation of my quick-throw mechanism as embodied in the thern'iostatic quiclithrow valve 20 vis as follows:

' Aspreviouslystated, theball r94 has a certain freedom to move to the right or left in the shell 100. f Thispermits the rod 90 and the secondary cam member 76 to have a similar freedom. Urged by thespring 86, however, the secondary cam: member 76is constantly forced upward so that theroller 85 kcaigages the peak-shaped cam surface 37V of the primary cam member- .32. It depends upon which slope of the surface 37 is 'engaged bythe roller 85 as to whether the secondary cam member 76 and the rod 90 are disposed at the right-hand or at the left-hand end of the path which they are free to move upon by virtue of the play of the ball 94 in the shell 100. As previously mentioned, the primary cam member 32 has the form of a bell crank 33 which .is swung tothe right as the lower end 31 of the thermostat rod 30 moves downward. This latter motion occurs as the water in the tank chamber 11 cools off. F ig. 2 shows the parts of themechanism positioned as they would be when the water in the tank chamber 11- is between its minimum and maX- lirnurn temperatures and with the secondary llO cam member 7G and the rod 90 in right-hand position so as to permit the spring 63 to close the valve 50 and shut oil the supply of gas through the hole 68 to the gas burner 15. rl"hus it is clear that with the gas burner shut oft', the water in the tank chamber 11 will be gradually cooling off due to radiation and t use of the water from the service outlets.

As the water cools the lower end 31 of the rod moves down swinging the primary cam member 32 to the right against the tension of the spring 88 until the roller 85 passes overthe peak of the cam surface 37. As this occurs the compression spring 86 is released to force the secondary cam member 76V upward, the engagement of the'roller 85 with the opposite slope of the cam surface 37 at this time causing the secondary cam member 76 and the rod 90 to be thrown to the left with a quick movement into the position in which these part-s are shown in Fig. 3. In this movement the button 93 engages the end of the valve stem 58 so as to open the valve 50 to permit gas to pass therethrough into the gas chamber 42 and thence by way of the opening 68 and the pipe 69 to the gas burner 15, this gas being ignited by a suitable pilot light which is constantly burning adjacent to the burner 15.

As the flame from the burner 15 heats the water in the retort 12 and in the tank chamber 11 and its temperature rises to the desired maximum, the lower end 31 of the rod 8O is drawn upward so as to relieve the bell crank 33 fromits pressure and to permit the spring 38 to swing this bell crank to the left so that the peak of the cam surface 37 will again be passed over by the roller 85, but in the opposite direction from that previously described for the opening of the valve 50. As

the roller 85 passes over the peak of the cam surface 87, the secondary cani member 7 6 and the rod 90 snap from their left position to their right position and the pressure of the button 93 against the valve stein 58-is relieved, permit-ting the spring 63 to close the valve and stop the liow of gasto the burner y 15.V

rEhenumber of degrees of temperature between minimum and maximum temperatures is a function of the fixed proportions of the mechanism and is therefore consequently a constant quantity. Y

The absolute values of maximum and minimum temperatures, or those at which the valve 50 is closed or opened respectively, are

might be made without departing from the spirit of the invention or the scope of the appended claims. For example, it might be immaterial whether or not the cam surface 87 was provided upon the primary cam member 32 or upon the secondary-cam member 7 6 so long as the roller follower 85l was provided upon the other ofthese two members. therefore desire to belimited only by the liberal interpretation of the appended claims.

If it is found desirable, stops 125 comprising pairs of nuts screwed upon the threaded end of the rod 90 may be disposed on oppositev sides of the rocking pin 78 so as to limit the adjustment of the rod 90 relative to the pin 78. As each of t-lie stops would be formed by two nuts threaded on the rod 90, each of the stops could be given a fixed adjusted position by bringing the nuts which comprise it into pressural contact with each other. These stops would necessarily be of such an outside diameter as to permit them topass between the arms ofthe forked head 77 so as to come in contact with -the rocking pin 78 and thus limit the longitudinal adjustment of the rod- 9() relative to therocking pin 78 ina given direction. ln case stops, as above described, were used upon the rod 90 longitudinal movement of the rocking pin 78 in the forked head 77 would be prevented by any suitable means provided in the construction of the secondary cam member 76. Thus the rod 90'would at all times be disposed. equidistant from the two arms of the forked head 77. A

ltis to be understood that while a hand wheel `112 is shown for the rotation of the rod 90, any suitable mechanism may be employed for this purpose and that indicia may be pro-- vided upon this rod rotating means and the housing shell 4l() so as to indicate the temperature at which the quick-throw mechanism will operate for a given position of this rod rotating means.

l claim as my invention: ,F

1. ln a quick-throw mechanism, the com'- bination of: a primary cam member-adapted tov move relatively slowly, a substantial coniiio ponent of said slow movement being in a givn en direction; a quick-throwmember adapted to move quickly, a substantial component of saidv quick movement being in a direction parallel to said component of said slow movement; means for limiting said quick movevment of said quick-throw member; a secondary cam member associated withsaid quickrthrow member so as to partake of said limited quickmovement thereof; means for yieldably urging said secondary cam member against said primary cam member in a direc- Y tion transverse to said direction of movement of said primary cam member, one of said cam members having a peak-shaped cam surface over vwhich the other cam member rides, the passage of said other` cammember ,over the crest ofsaid peak causing vsaid quick movement ofsaid secondary cam member and said quick throw member, said quick-throw member having a screw-thread engagement with said secondary cam member; and means for rotating said quick-throw member to vary the cooperative relationship of said cam members and thus vary the time of the quickthrow movement relative to the movement of the primary cam member.

2. In a quick-throw mechanism, the combination of: a primary cam member adapted to move relatively slowly, a substantial component of said slow movement being in a given direction; a quick-throw member adapted to move quickly, a substantial component of said quick movement being in adirection parallel to said component of said slow movement; `means for limiting said quick movement of said quick-throw member; a secondary cam member associated with said quick-throw member so as to partake of said limited quick movement thereof; means for yieldably urging said secondary cam member against said primary cam member in a direction transverse to said direction of movementy of said primary cam member, one of said cam membershaving a peak-shaped cam surface over which the other 'cam member rides, the passage of said other cam member over the crest of said peak causing said quick movement of said secondary cam member and said quick-tlirowmember; and means for adjusting the position of said secondary cam member relative to said quick-throw member to determinev at which position of said primary cam member that said rapid movement takes place.

3. In a quick-throw mechanism, the combination of: a primary cam member adapted to move relatively slowly, a substantial-component of said slow movementbeing in a giv-.

en direction; a secondary cam vmembei' adapted to move quickly, a substantial component of said quick movement being in a direction parallel to said component of said slow movement; means yieldably urging said secondary cam member toward said primary cam member ina direction transverse to the direction of said component of said slow movement; means for limiting said quick movement of said secondary cam member, there being cam surfaces-on said cam membersY which cooperate during said slow movement to move said secondary cam member a given distance in said transverse direction against said yieldable means away from said primary cam member, said caml surfaces discngaging at said distance, to permit said secondary cani member to be moved quickly towards said primary cam `member by said yieldable means, said movement resulting in the aforesaid quick movement of saidsecondary cam member, and 'rotary adjusting means for varying the `cooperative relationship of said cam members and thus varyY the time er' the quick movement of the secondary cam member relative to the slow movement of the primary cam member.

4; In a quick-throw mechanism, the combination of: a frame; a primary cam member mounted on said frame and capable of relatively slow movement in a given direction; a secondary cam member mounted on said frame for movement in a direction substantially parallel to that of said primary cam member; yieldable means for urging said secondary cam member against said primary cam member,sthere being cam surfaces on said cam members whichV cause said slow movement of said primary cam member to force said secondary cam member a given distance in a direction transverse relative to said slow movement, said surfaces then disengaging to permit said secondary cam member to respond to said yieldable means in a quick movement; and means for varying the cooperative relationship of the primary and secondaiy cam members.

5. In a quick-throw mechanism, the combination of: a primary `cam member capable of relatively slowv movement; a secondary cam member movable 'relative to said primary cammember; a cam follower provided on one of said members, there being aV peak like cam surface provided on the other member; means for urging said secondary cam member toward said primary cam member so that said follower rests upon a slope of said peak like cam surface so that said secondary cam member is urged laterally; means for Vlimiting lateral movement of said secondary with; and means for rotating said actuating member tovary the cooperative relationship of said cam members andl thus determine at what point in the travel of the primary cam.

member the quick movement of the secondary cam member and actuating member will take place. f

6. A combination as in claimt in which said limiting means is adjustable to determine A where in said movement of said primary cam member that said follower rides over the crest of said Vcam surface.

v7. In a quick-throw mechanism, thev combination of: a frame; a primary cam member mounted on said frame and capable of relatively slow movement in a givengdirectien' frame for movement in a direction substantially parallel to that of said primary cam member; yieldable means for urging said secondary cam member against said primary cam member, there being cam surfaces on said cam members which cause said slow movement of said primary cam member to force said secondary cam member a given distance in a direction transverse relative to said slovv movement, said surfaces then disengaging to permit said secondary cam member to respond to said yieldable means in a quiclr movement; a rotatable actuating rod having a screw-thread engagement with said secondary cam member; a housing enclosing the above-named mechanism; and means associated with said rod and extending through said housing, said last-named means being operable from the exterior to rotate said rod and vary the cooperative relationship of they tWo cam members.

In testimony whereof, I have hereunto setl myhand. atLos Angeles, California, this 11th day of June, 1927.

PETER s. ivANHorF.V

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