US817783A - Device for regulating heating apparatus. - Google Patents

Description

No. 817,783. PATBNTED APR. 17, 1906. W. H. KIRNAN. DEVICE FOR REGULATING HEATING APPARATUS.

APPLICATION FILED JAN.11, 1904.

4 SHEETS-SHEET 1.

I V ntor Witnesses I x WA Attorneys.

PATENTED APR. 17, 1906.

W. H. KIRNAN.

DEVICE FOR REGULATING HEATING APPARATUS.

APPLICATION FILED .TAN.11, 1904.

4 SHEETS-SHEET 2,

llventor Vitnesses Attorneys.

PATENTED APR. 17, 1906.

W. H. KIRNAN.

. DEVICE FOR REGULATING HEATING APPARATUS.

APPLICATION FILED JAN.11, 1904.

4 SHEETS-SHEET 3.

Witnesses A tlorneys.

PATENTED APR. 17, 1906.

APPLICATION FILED JAN.11, 1904.

4 SHEETS-SHEET tor Witnesses Attorneys.

UNTTED STATES PATENT @FFICE.

DEVICE FOR REGULATING HEATING APPARATUS.

Specification of Letters Patent.

lzatentecl April 17, 1906.

Application filed January 11,1904. Serial No. 188,632.

To aZZ whom [it may concern:

Be it known that I, l/VILLIAM H. KIRNAN, a citizen of the United States, residing at Bayonne, Hudson county, State of New Jersey, have invented a certain new and useful Improvement in Devices for Regulating Heating Apparatus, of which the following is a description.

The present invention relates to devices controlled by a thermostat for regulating the temperature in rooms or buildings.

The objects of the invention are to produce a positively-operated mechanical apparatus for opening or closing the draft door or damper or otherwise regulating the heater, such apparatus being controlled by a thermostat, which is preferably an electric thermostat.

Another object is to make such a device of a very simple nature and possessing few parts, all of those being exposed and readily accessible.

Another object is to produce an apparatus which will possess sufiicient power to positively actuate the controlling means on the heater and which will run for some time with one winding.

Another object is to provide means for open-circuiting the battery after each operation, so that the battery will not waste.

Another object is to provide means for removing gas or smoke from the cellar when the damper or draft-door is closed.

The invention comprises a mechanical device which may be arranged within the furnace-room or otherwise adjacent to the heating apparatus provided with mechanical connections for opening or closing the damper or draftdoor of the hotair furnace, hotwater heater, or boilerfurnace. The mechanical device is provided with a suspended weight or spring by means of which its movable element will be revolved or otherwise moved. This movable element is in the preferred form a wheel with pins arranged about its periphery, such pins being alternately short and long. A pivoted lever so arranged that one end will swing within the path of movement of the pins is connected at the other to the cord, chain, or lever which actuates the draft device of the furnace. A lock, which is preferably in the form of a bellcrank lever having an arm arranged to swing Within the path of movement of all of the pins and engaging with one of them, ordinarily pre vents the wheel from turning. Upon the Vertical.

lock being swung to one side the Wheel will be I lock is arranged to engage with the pins, both long and short, and actuated by a latch or trigger, which is tripped by an armature con trolled by a magnet. A setting device is provided for returning the latch and lock to their normal position after the wheel has moved to present another pin in position for action on the draft-operating lever. The magnet is in an electric circuit, which includes a battery and a thermostat, and connections are arranged so that the magnet will be excited every time the thermostat reaches either extreme pointthat is to say, if the thermostat is set for any given temperature the circuit will be completed when the moving member of the thermostat engages with either the high or low temperature contacts. Within the circuit is an electric switch, by means of which the circuit will be broken every time the mechanism is actuated, and it will not be again completed until verse movement of the thermostat. In addition to the damper and draft regulator a door is provided in the smoke-pipe of the furnace and connected with the oscillating lever and so arranged that when the draft-door is closed this door will be opened, thereby permitting the smoke and gases within the cellar or furnace-room to pass up the smoke-pipe.

In order to better understand the nature of the invention, attention is directed to the accompanying drawings, in which Figure 1 represents a diagrammatical view of the entire apparatus as applied to a hotwater heating system. Fig. 2 is a front View of the mechanical device showin in its locked position and the oscillating lever Fig. 3 is a similar view of the mechanical device showing the wheel in the act of being rotated and the latch and lock free, the oscillating 4 is an end View of the mechanical device in the position shown in Fig. 2.

In all of the views like parts are designated by the same letters and figures of reference.

the wheel byare- ICC lever being inclined and Fig.

IIO

Referring to Fig. 1, the heater a is shown pipe 9. This with a draft-regulating door 7) arranged at the bottom thereof. This heater may be of any form, and it is to be understood that the invention may be applied to control any portion of the furnace, hot-water heater, or boiler furnace by means of which the heat thereof is regulated. In addition to the door I) a damper might be applied and so connected as to move in unison therewith. The connection with such a damper forms no part of the present invention, it being understood that the invention relates to means provided to regulate the heat of the heating apparatus, irrespective of the portion. thereof which is actuated.

The door I) is connected, through a wire or chain c, to the oscillating lever d, which forms a portion of the mechanical device indicated generally by the reference character 6. This mechanical device is so arranged that it will move the lever d from. the vertical position shown to the position shown in dotted lines, or vice versa, whereby the door I) will be opened or closed. In the mechanism illustrated the door I) is heavier than the door f, so that the former will always have a tendency to close. In connection with the door I) is a doorf within an opening in the smokedoor is connected, through a chain or wire it, to the lever d and is so arranged that it will be closed as the door I) is opened, or vice versa, so that when the door I) is closed the door f will be opened and foul air or gas from the furnace-room or cellar will be drawn up through. the smoke-pipe g. Suitable guide-pulleys are provided for the wires 0 and h, as the occasion requires. The mechanical device 6 is actuated by a thermostat 'i, located within a room of the house to be heated. This thermostat makes contact with the adjustable points and k in the manner well known. As illustarted, the thermostat is of a conventional form but it is understood that any variety of thermostat may be used. The moving element of the mechanical device is operated by a weight Z.

In order to understand the details of construction of the mechanical device, reference is to be had to the other three figures of the drawings. The moving elements are attached to a plate 1. which is preferably of castiron, with integral lugs or pillars for the attachment of the different moving elements of the structure. This plate 1 is provided with holes 2 at the proper points, by means of which it may be attached to the ceiling of the cellar or to any point sufficiently elevated above the floor to allow a sufficient drop of the weight. Z. Upon the plate 1 is a shaft 3, which passes through a bearing 4 in the plate, and also a second bearing 5, which is made in the plate 6, supported by pillars 7 which may be cast integral with the plate. This shaft 3 is provided with a grooved pulley 8, around which is wound the cord 9, to which the weight Z is attached. The pulley 8 is provided. with a pawl 10, which engages with the teeth. of ratchet 11, keyed to the shaft 3. A handle 12 allows the wheel 13 to be rotated and the weight elevated, the pawl and ratchet permitting the pulley to turn upon the shaft 3 without rotating it. To the other extremity of the shaft 3 is secured a wheel 13, preferably of cast-iron, having a number of pins upon or near its periphery, as shown. These pins are preferably cast integral with the wheel 13 for the purpose of producing a cheap device; but this is not necessary, as the wheel may be made of other than cast metal and the pins may be separately made and attached. As shown in the drawings,

there are ten of these pins, half of them (designated by the reference-numbers 14) being longer than the other half, (designated by the numbers 15.) (See Fig. 1.) Any number of pins may be used; but it is quite essential for the proper operation of the apparatus that they be even in number.

The lever d is pivoted at 16 to a lug 17 and stands out su'fliciently far from the plate 1 so that its lower end will clear the short pins 15, but will be engaged by the long pins 14.

As seen in Figs. 2 and 3, a partial rotation of the wheel 13 in the direction of the arrow will cause an oscillation of the lever 61, its lower end successively engaging with the long pins 14, which hold it in the vertical position (shown in Fig. 2) or inclined, as in Fig. 3. A further rotary movement of the wheel will cause the pin to slip beyond the edge of the lever and allow it to swing past to the following short pin and be engaged by the succeeding long pin.

The wheel 13 rotates in a clockwise direc tion, as shown by the arrow in Fig. 2, and means is provided to allow it to intermittently rotate one-tenth of a revolution at a time, so that the lever (1 will be oscillated and the draft apparatus alternately opened and closed. This intermittent movement of the wheel 13 is secured by a lock which intermittently engages with both long and short pins and is actuated by a mechanism controlled by the thermostat i.

The lock and. controlling mechanism is as follows: The wheel 13, always tending to turn in a clockwise direction, is prevented from doing so except at the desired intervals by means of a lock which consists of a bell crank lever 18, having an elevated arm 19 and a depending arm 20. This lever is pivoted to the bearing 21, secured to the plate 1 in such a manner that when it is in the position shown in Fig. 2 the elevated arm 19 will engage with one of the pins 14 or 15, the lever 18 being sufficiently close to the plate 1 to prevent the lever not being engaged by the short pins. When the lever 18 is oscillated about its pivot to the position shown in Fig. 3, the lever 19 will be out of the path of movement of the pins and will permit the wheel to turn. Fixed stops 22 and 23 on the plate 1 limit the movement of the lever 18. The lever 18 is tripped from engagement with the pins of the wheel by means of a latch 24, which consists of a bell-crank lever having an approximately horizontal arm 26 and a vertical arm 25. This lever is preferably pivoted upon the same pin 21 which supports the lever 18, but is outside thereof. The lever 26 is held in the position shown in Fig. 2 by means of the armature 27, which is pivoted at 28 to a bracket 29, secured to the plate 1, and is actuated by the magnets 30. A spring 31, with an adjusting-screw 32 for varying the tension thereof, is provided for separating the armature from the magnets when the latter are denergized. At the lower extremity of the lever 25 is a pin 33, so arranged as to engage with the lever 20 after the lever 26 has dropped some distance below the horizontal. A spring 34 is used to move the pin 33 into engagement with the lever 20 and by such movement release the look from engagement with a pin 14 or 15 on the wheel 13. The spring 34 does not connect directly with the lever 26, but by the intermediary of a link 35,which is pivoted at 36 to the lever 26. This link is provided with upturned ends 37 38 to permit it clearing the hub of the lever 24.

As shown in Fig. 2, when the lever 26 is elevated and rests upon the upper edge of the armature 27 a line drawn through the central point of pivot 21 of the lever 26 to the pivot 36 will extend but slightly above the fixed point 39 of the spring 34. As so arranged the spring 34 will have slight tendency to depress the lever 26, but will largely tend to draw the lever 24 against its bearing. The lever 26 will therefore rest lightly upon the upper edge of the armature and will not be pressed thereagainst, so that a comparatively small amount of force will be required to dislodge the armature from its position under the lever. The lever will drop largely by the action of gravity before the spring begins to exert any force. The farther the lever falls the more the tension of the spring will tend to force it downward. At the point when the latch assumes a position almost the same as that shown in Fig. 3 the spring 34 will be exerting a decided pull upon the lever 26 suiiiciently to partially rotate the lever 18 and release the lock from engagement with the pin on the wheel. By this construction a comparatively weak battery and magnets may be employed, the danger of the armature sticking to the latch will be overcome, and at the same time sufficient power will be provided for releasing the look even with the tension of the weight Z tending to revolve the wheel 13 and resisting such releasing of the lock. The effect of the'spring 34 will be increased, as will be understood, by the blow ing remembered that the which will be given by the pin 33 to the lever 20. Instead of placing the stop 39 and pivots 21 and 36 nearly on a line the stop 39 may be lowered, so that the spring will have greater tendency to depress the lever 26 when resting upon the armature. An extension 40 on the latch is caused to pass into the path of the pins 14 and 15, so as to be engaged by the latter (short, as well as long) to set the latch. A pin 41- on thelever 19 of the lock may be engaged by the latch when the latter is being set to return the lever to position to engage with the next pin.

The operation of so much of the mechanical device will be readily understood, it bethermostat is so constructed that the magnets 30 will be energized when the temperature falls below a definite point and rises above a definite point.

The parts being in the position shown in Fig. 2, upon the magnets being energized the armature will be attracted against the tension of the spring 31. This will free the lever 26, and it will drop with increasing velocity until the pin 33, striking the lever 20, will release the lock 18 from engagement with the pin on the wheel 13, and the latter will begin to revolve. .As soon as the wheel makes a partial revolution the electric circuit will be broken by means about to be described. The armature 27 will thereby be retracted by the spring 31. The latch 24 will be retracted by the engagement of one of the pins 14 15 with the extension 40, formed upon the latch 24; As soon as the lever 26 is elevated it will carry with it the lock 18 by the engagement of the pin 41 carried thereon with the latch 24. The lock 18 will engage with the next pin and prevent further revolution of the wheel 13. This partial revolution of the wheel 13 will oscillate the lever d to the position shown in Fig. 3, changing the relation of the controlling devices for the heater. It is to be understood that the lock successively engages with all of the pins, both long and short, while thelever engages only with the long pins. The electric circuits are shown in Fig. 1 in which the contact of the'thermostat is connected to the binding-post 42 by a wire m and the contact 7c is connected tothe binding-post 43 by awiren. Acommonreturn for the two, which is connected to the moving portion of the thermostat i, connects to the binding-post 44 by means of the wire 0. Within the circuit formed by the wire 0 is the battery 1). The binding- posts 42 and 43 are connected to the circuit-breaker g, about to be described, while the binding-post 44 is connected to the same circuit-breaker through the magnet 30.

As shown in Figs. 2, 3, and 4, the circuitbreaker 9 consists of three elastic contacts 45, 46, and 47, supported by an insulatingblock 48, secured to a pulley 49, whereby they will be insulated from each other and from the base 1. The center contact 45 is connected with the binding-post 44 through the magnet 30. The contact 46 is connected to the binding-post 42 and the contact 47 to the binding-post 43. The center contact 45 carries a small pin 50 of electrically-conductive metal. The contacts 46 and 47 are separated a sufficient distance to permit the contact 45 to be moved to engage alternately with either of the two contacts 46 and 47 but the elasticity of the center contact 45 tends to make electrical contact with the contact 47. It is moved into engagement with the contact 46 against its elasticity. The contact 45 being moved into engagement with either of the contacts 46 or 47 by its own elasticity or by other means will make a good electrical connection therewith. The contact 45 is provided with an extension 51, preferably made integral therewith, having an inclined portion or cam 52. As shown in the drawings, the extension 51 and inclined portion 52 are arranged to be within the path of movement of the pins; but, as shown in Fig. 4, it is removed a suflicient distance from the plate 1 by the proportions of the pillar 49, so that it will be engaged only by the long pins 14 and will not be engaged by the short pins 15. When not engaged by a pin, the elastic ity of the contact 45 will move it into engagement with the contact 47, as shown in Fig. 2. When engaged with one of the pins 14, the contact 45 will be moved against its own elasticity into engagement with the contact 46. This being understood, the operation will be as follows, reference being had to Fig. 1. As shown in that figure, the mechanical element 6 is in the same position as shown in. Fig. 2, the arm (1 being vertical and the pin 50 on the contact 45 in engagement with the con tact 47 The moving element of the thermostat i moving to the left and engaging with the contact 76, will complete the circuit through the wire a, binding-post 43, contacts 47 and 45,pin 50, the magnet 30,binding-post 44, and the wire 0, and battery p back through the moving element of the thermostat. magnets 30 being energized will attract their armature and, as has been before described, so actuate the latch and lock as to permit the wheel to turn a partial revolution, thus oscillating the lever (1. As soon as the wheel has turned slightly, however, one of the pins 14 will engage with the lever 51 or cam portion 52 thereof and move it to the position shown in Fig. 3, so that the contact 45 and pin 50 will engage with the contact 46 and contacts through 45 and 47 will be broken. When this occurs, the magnet will be at once deenergized, its armature retracted by its spring, and the lever 26 upon being elevated by the engagement of the extension 40 will be engaged and supported and prevented from again descending. The electrical ac- The tion is of course so much quicker than the mechanical action, which would tend to elevate and again depress the lever 26, that the latter can lower and raise but once with a closed circuit caused by the thermostat. When the temperature of the room changes, so as to move the thermostat into engagement with the contact the circuit will pass through the wire m, binding-post 42, contact 46, pin 50, contact 45, magnet 30, bindingpost 44, through the battery p and returnwire 0, thus completing the circuit, energizing the magnet, and tripping the mechanism again. This will allow another partial turn of the wheel, which will permit the lever d to assume a vertical position. The movement of the wheel will allow the pin 14, which engages with the extension 51, to slip by the end thereof, and the elasticity of the contact 45 will restore the parts of the contact q to the position shown'in Fig. 2 and make connection between the contacts 45 and 47 and pin 50. It will be seen from this explanation that the electric circuit, except at the moment that the moving element of the thermostat engages with one of the fixed contacts, is an open circuit. The batteries will therefore be subjected to no waste and may be used for a much longer period of time than if this were not the case. Furthermore, certain kinds of batteries which are very eiiicient when used on open circuit, but which cannot be used for any length of time upon. a closed circuit, may be employed.

It is to be understood that the mechanical device may be used with other forms of thermostat, and, if desired, a mechanical thermostat may be used for tripping the latch 24. In this case the device might be arranged within a room the heat of which it is desired to be regulated and mechanical connections thereby made to the heating apparatus, or the mechanical device could be arranged as illustrated in Fig. 1, with mechanical connec tions between the thermostat and mechanical device. In order to prevent shock to the mechanism by the dropping of the weight 1, a spiral or other spring 1" may be interposed between it and the grooved wheel 8.

Having now described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination with a thermostat, of a rotatable wheel, projections on the wheel, a lever-arm so pivoted that it will be engaged by the projections, a lock engaged by the projections for securing the wheel against rotation, and means controlled by the thermostat for actuating the lock.

2. The combination with a thermostat, of a rotatable wheel, alternately-arranged long and short projections on the wheel, a leverarm so pivoted that it will be engaged by the long projections, a lock engaging with the projections for securing the wheel against rotation, and means controlled mostat for actuating the lock.

3. The combination with a thermostat, of a rotatable wheel, projections on the wheel, a lever-arm so pivoted that it will be engaged by the projections, a heater having a door or damper, connections between the lever-arm and the door or damper of the heater to be regulated, a lock for securing the -wheel against rotation, and means controlled by the thermostat for actuating the lock.

4. The combination with a thermostat, of a rotatable wheel, alternately-arranged long and short projections on the wheel, a leverarm so pivoted that it will be engaged by the long projections, a heater having a door or damper, connections between the lever-arm and the door or damper of the heater to be regulated, a lock engaging with the projections for securing the wheel against rotation, and means controlled by the thermostat for actuating the lock.

5. The combination with a thermostat, of a rotatable wheel, a lock for securing the wheel against rotation, a latch for tripping the lock, means controlled by the thermostat for releasing the latch, means carried by the wheel for resetting the latch, and a lever-arm so arranged that it will engage with the resetting means.

6. The combination with a thermostat, of a rotatable Wheel, alternately-arranged lon and short projections, a lever-arm so pivoted that it will be engaged by the long projections, a lock engaging with the projections for securing the wheel against rotation, a latch for tripping the lock, and means controlled by the thermostat for actuating the latch.

7. The combination with a thermostat, of a rotatable wheel, projections on the wheel, a lever-arm so pivoted that it-will be engaged by the projections, connections between the lever-arm and the door or damper of the heater to be regulated, a lock for securing the wheel against rotation, a latch for tripping the lock, and means controlled by the thermostat for actuating the latch.

8. The combination with a thermostat, of a rotatable wheel, alternately-arranged long and short projections on the Wheel, a leverarm so pivoted that it will be engaged by the long projections, a heater provided with a door or damper, connections between the lever-arm and the door or damper of the heater to be regulated, a lock engaging with the pro jections for securing the wheel against rotation, a latch for tripping the lock, and means controlled by the thermostat for actuating the latch.

9. The combination with a thermostat, of a rotatable wheel, means for rotating the wheel, projections 011 the wheel, a lever-arm so pivoted that it will be engaged by the projections, connections between the lever-arm by the therand the door or damper of the heater to be regulated, a lock for securing the Wheel against rotation, and means controlled by the thermostat for actuating the lock.

10. The combination with a thermostat and an electric circuit, of a rotatable wheel, means for rotating the Wheel, a lock for securing the wheel against rotation, a latch for tripping the lock, an armature for freeing the latch, electric means within the circuit for actuating the armature, and means carried by the wheel for resetting the latch.

11.-The combination with a thermostat and an electric circuit, of a rotatable wheel, means for rotating the wheel, alternately-arranged long and short projections on the wheel, a lever-arm so pivoted as to be engaged by the long projections, a lock engaging with the projections for securing the wheel against rotation, a latch for tripping the lock, an armature for freeing the latch, and electric means Within the circuit for actuating the armature.

12. The combination with a thermostat and an electric circuit, of a rotatable wheel, means for rotating the wheel, a lock engaging with the wheel for securing it against rotation, a latch for tripping the lock, an armature for freeing the latch, means carried by the wheel for resetting the latch, electric means within the circuit for actuating the armature, and contact-points arranged within the path of movement of the Wheel for breaking the circuit after the movement of the wheel.

13. The combination with a thermostat and an electric circuit, of a rotatable wheel, means for rotating the wheel, alternately-arranged long and short projections on the wheel, a lever-arm so pivoted as to be e11- gaged by the long projections, a lock engaging with the projections for securing the wheel against rotation, a latch for tripping the lock, an armature for freeing the latch, electric means within the circuit for actuating the armature, and contact-points ar- IIO ranged within the path of movement of'the projections and engaged by the long projections for breaking ment of the wheel.

14. The combination with a rotatable Wheel, means for rotating the wheel, projections on the wheel, a bell-crank lever so pivoted that one arm mayswing in the path of movement of the projections and lock the wheel against rotation, a second bell-crank lever forming a latch, a projection carried by one of the levers and adapted to engage with the other to free the lock from engagement with the wheel, a pivoted lever engaging with the latch, a spring for moving the latch into engagement with the lock, and a projection on the latch adapted to be engaged with the projections on the wheel, and a projection on the circuit after a moveone of the levers adapted to be engaged by the other lever for moving the lock in the path of the projections.

15. The combination with a rotatable wheel, means for rotating the wheel, projections on the wheel, a bell-crank lever so pivoted that one arm may swing in the path of movement of the projections and lock the wheel against rotation, a second bell-crank lever forming a latch, a projection carried by one of the levers and adapted to free the lock from engagement with the wheel, means for releasing the latch, a pivoted lever engaging with the latch, a spring for moving the latch into engagement with the lock, a projection on the latch adapted to be engaged by the proj ections on the wheel, and a projection on one of the levers adapted to be engaged by the other lever for moving the lock in the path of movement of the projections.

16. The combination with a movable ele ment and source of power therefor, of a latch having a depending portion, a lock having a depending portion, a pin carried by one of the portions and adapted to be engaged. by the other for tripping the lock, and means for actuating the latch.

17. The combination with a movable ele ment and a source of power therefor, of a latch having a depending portion, a lock hav ing a depending portion, a pin carried by one of the portions and adapted to be engaged. by the other for tripping the lock, a second projection on one of the portions adapted to be engaged by the other for setting the lock and means for actuating the latch.

18. The combination with a movable element and a source of power therefor, of a latch having a depending portion, a lock hav ing a depending portion, a pin carried by one of the portions and adapted to be engaged by the other for tripping the lock, a second. projection on one of the portions adapted to be engaged by the other for setting the lock, means for actuating the lock, and means carried. by the movable element for resetting the latch.

19. The combination with a movable element and a source of power therefor, of a latch having a depending portion, a lock having a depending portion, a pin carried by one of the portions and adapted to be engaged by the other for tripping the look, a projection on the latch by means of which it is moved and. means for actuating the latch.

20. The combination with a movable element and a source of power therefor, of a latch having a depending portion, a lock having a depending portion, a pin carried by one of the portions and adapted to be engaged by the other for tripping the look, a second projection on one of the portions and adapted to be engaged by the other for setting the look, a projection on the latch, by means of which it is moved, and means for actuating the latch.

21. The combination with a movable element and a lock therefor, of a latch for tripping the lock, and a common pivot for the lock and latch, and means for actuating the latch.

22. The combination with a movable element and a lock therefor, of a latch for tripping the lock, a common pivot for the lock and latch, and magnetic means for releasing the latch.

23. The combination with a movable ele ment and a lock therefor, of a latch. for tripping the lock, a common pivot for the lock and latch, means for actuating the latch, and means carried by the moving element for re setting the latch.

24:: The combination with a movable element and a lock therefor, of a latch for tripping the lock, a common pivot for the lock and latch, magnetic means for releasing the latch, and. means carried by the moving ele ment for resetting the latch.

25. The combination with a movable element and a latch having a depending portion, of a lock having a depending portion, a pin carried by one of the portions and adapted to be engaged by the other for tripping the lock, a common pivot for the latch. and lock, and means for actuating the latch.

26. The combinationwith a movable element, and a lock having a depending portion, of a latch having a depending portion, a pin carried by one of the portions and adapted to be engaged by the other for tripping the lock, a common pivot for the lock and latch, means for actuating the latch, and means carried. by the moving element for resetting the latch.

27. The combination with a movable ele ment, of a latch having a depending portion and a pin thereon, a lock having a depending portion and adapted to be engaged. by the pin, a projection on the lock adapted to be engaged. by the latch, and means for actuating the latch.

The combination with a movable element, of a latch having a depending portion and a pin thereon, a lock having a depending portion and adapted to be engaged by the pin, a projection on the lock which is adapted to be engaged by the latch, means for actuating the latch, and. a common. pivot for the latch and lock.

29. The combination with a movable element and a lock therefor, of a latch for actuating the lock, having an arm, a stop for the arm, a spring connected to the arm, the spring being upon substantially the same p plane as the arm when engaged by the stop,

and means for releasing the latch.

30. The combination w1th a movable elel ment, of a latch having an arm, a stop there-

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