US1299526A - Damper-operating motor. - Google Patents

Description

E. H. WHITE.

DAMPER OPERATiNG MOTOR. APPucAuoN f|LED1AN,1o.191e.

Patented Apr. 8, 1919.

EVERETT H. WHITE, or sT. PAUL, lirrrrirnsorn.I

DAMPER-OPERATIN G MOTOR.

Specification of Letters Patent.

Patented Apr. s, 1919.

Application mea January 1o, 191s. serial No. 71349.

To all whom t may concern:

Be it known that I, EVERETT H. WHITE, a citizen of the United States,'residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Damper-Operating Motors, of which the following is a specification.

My invention relates to damper operating motors of the form in which an electric motor is used to operate a shaft, which shaft may be instantly stopped by a catch controlled through an electromagnetl when said shaft arrives at certain predetermined positions. The object of the invention is to provide switching means which shunt the motor field and give the magnet the full electric motive force of the battery, an'd to provide a spiing connection in the shaft between the catch elements and the driving elements so that in releasing t-he catch no force is exerted between the catch elements,

making the catch certain. A further object is to provide circuit breakers for stopping the motor in various positions of the dampers and to provide circuits for causing certain of the circuit breakers to operate combinedly to make the damper-operating arms to travel a minimum distance in reaching the predetermined position. v

The full objects and advantages of my invention will appear in connection with the detailed description thereof andare particularly pointed out in the claims.

In the drawings, illustrating the application of my invention in one form,-

Figure 1 is a plan view of my improved damper-operating motor with some parts cut away. Fig. 2 is a section taken substan` tially on line 2 2 of Fig. 1. Fig. 3 is a section of a portion of the device taken on line 3 3 of Fig. 1. Fig. 4 is a wiring diagram in which the circuit breakers are represented by a sectional view taken on line 4-4 of Fig'. 1.

The frame of my device consistsl of two parallel plates 10 and 11 held spaced by and secured to four transverse bars l2, 13, 14, 15 located at the corners of said plates. At one end of this frame is located an electric motor 16 which tits snugly between the two plates 10 and 11 and which is secured to plate 10 by-screws 17 which fasten directly lnto the motor iield frame. The drive Shaft 18 of motor 16 is provided with a pinion 19 which meshes with a gear 20 fast on a shaft 2l Journaled in brackets 23 and y22 secured to the frame plate l0. Gear 20 is connected by means of a coil spring 24 surrounding the shaft 21 to a worm gear 25, so that driving connection between the two said gears takes place through the spring 24, it being necessary to wind said spring a certain amount before the driven gear starts to rotate. Wormgear 25 meshes with a worm wheel 26 fast on a transverse shaft 27 journaled in the frame members 10 and 11 and extending out beyond the sameon both sides. At the extreme ends of shaft 27 are positioned arms 28 and 29 extending out Voppositely to each other, which arms 4may be attached to the dampers of a boiler or furnace to open and close the same in the usual manner.

In order to stop the action of the arms 28 .and 29 at certain fixed predetermined positions, I employ the device best shown Figs. 2 and 3. Integral with worm 25 is a sleeve 3() which has secured to it a disk `31. Sleeve 3() with the parts integral therewith, as before stated, is loosely mounted on shaft 2l and is retained against longitudinal motion by collars 32 and 33 secured to said shaft. Disk 31 is provided on its periphery with a notch 34 which may be engaged by a catch 35 formed at the end of the armature 36 of an electromagnet 37. The armature is pivoted in a casting| 38, and the electromagnet 37 is attached to a bracket 39, both of which aire secured to the frame member 10. The parts are so arranged that when the electromagnet 37 draws up its armature 36 the catch 35 is disengaged from the notch 34 and the disk 31 is released. Armature 36 carries insulated therefrom one member 40 of a circuit breaker, thefunction of which will later be explained. TheV other member 41 of this circuit breaker is secured to an insulating block 42 attached to the frame member 10.A The exact shapes of these members areelearly shownin Fig. 2.

The 'c'ircuit breakers used for stopping inotor 16 when arms 28 and 29 arrive'at'the requisite positions are best shown in Figs. 1, 2 and 4. Attached to plate 11 in the vicinity of shaft 27, by screws 64, is a plate 43 of insulating material. To correspond to the positions which the arms 28 and 29 are desired to take are located corresponding contact fingers 44, 45, 46, 47, 48 and 49 radially disposed upon plate 43v about shaftv iusl pin 52-as the shaft 27 rotates is to raise the individual fingers from their contact points, as shown in Fig. 1, and break the circuits connected therewith. Plate 43 is provided with four binding posts 59, 60, 61 and 62 by which the machine is connected to a suitable thermostat and the parts on plate 43 extending through to the back of the same are insulated from the frame member 11 by a sheet of insulating material 63.'

Thewiring diagram is shown in Figi 4. Contact points 53, 58, 57, and 56 are all donnected together and to a lead 65 which goes to one terminal of the motor armature 66. Contact point-54 is connected by a lead 67 to finger 49, and contact point 55 is connected by a lead 68 to finger 48. The fingers 44, 45, 46, 47 are respectively connected by leads 69, 70, 71 and 72 to binding posts 59, 60, 61 and 62. Binding posts 59, 60, 61 and 62 are connected through lines 73, 74, 75 and 76 with the fixed contact members 77,

78, 79 and 80 of a suitable thermostat 81. The movable contact member 82 of the thermostat 81 is connected through-a line 83 with' a battery by a lead 85 with the other terminal of the armature 66.

v The action of the device is as follows. the normal position, when pin 52 is at rest, it lifts one of fingers 45, 46, etc., and opens the circuit 'n which that finger is placed. At the sam lme member 82 closes the same circuit at thel'thermostat and all the remaining circuits are hence broken atl the thermostat. This means that all of the circuits are open but as soon as member 82 shifts, one of the other circuits is closed and is set in action. It continues un motor pin 52 breaks that circuit by lifting the corre-` sponding contact finger, and then actionl ceases. In the arrangement shown, when finger 47 is lifted thedraft door is closed; when finger,A 48 is ,lifted the draft door is one-quarter open; and when fingers 49.and

44 are successively opened the draft door becomes one-half and full open. It hence becomes evident that the door also takes the guarter and half open position when the ngers 46 and 45 are lifted.' For this reason the circuit breakers 45--54 and 49-58 are connected in series, and also the circuit camportions 50 which overlap a lingly 84 which, in turn, connects either of the two circuit breakers for one position of the draft door be engaged by pin 52 the draft door will be correspondopened and the arms will travel the minimum amount in arriving at the desired position.

It would not be possible to stop the motor soon enough when the" circuit has been broken, and for that reason the notched disk and catch arrangement, with the releasing magnet, has beenv provided. Again referring to Fig. 4, the field 86v of the motor 16 and the electromagnet 37 are connected in' series by a lead 87 and are shunted across the armature terminals by leads 88 and 89. The field 86 is normallyshort circuited by a circuit 90 connected in at the leads 88 and 87 and contains the circuit breaker 40-41 operated by the electromagnet armature 36. When at rest circuit 83-65 is open and the circuit 90 is closed. Upon closing circuit 8,3-65 current is supplied to the armature 60 of thel motor 16 and to the electromagnet 37, the field 86 being'short circuited by the shunting circuit 90 and hence substantially deprived of current. The armature 36 is hence raised and the catch 35 disengaged from the notch 34 in disk 31 so that the same is free to rotate. Not until said catch is completely withdrawn is the switch 40-41 opened to energize the field 86. Thus the whole electromotive force of the battery is impressed upon the magnet 37 at the time it commences to operate, and when the same is inl its drawn up position the electromotive force is impressed across both the motor field and the electromagnet in series. This gives sufiicient current to maintain the magnet raised and to operate the motor, When any of the circuit breakers on plate 43 are opened the circuit 83--65 is broken and both the motor 16 and magnet 37 are deprived of current. Armature 36, which is normally held downward by a spring 91, immediately moves downward and catch 35 engages notch 34 in disk 31 as soon as it comes around and instantaneously stops sleeve 30 together with gears 25 and 26. The motor armature, however, has considerable momentum, due to its high velocity, and spring 24 serves to absorb the "energy of the same and hence winds up.

time and energy consumed in rotating the operating arms is also lessened, thus rendering the device more efficient.

I claim:

1. A damper operating device comprising a main shaft, a Worm gear on said shaft, a countershaft, a sleeve rotatably mounted on said countershaft, a worm integral with said sleeve and driving said worm Wheel, a gear fixed on said countershaft, a coil spring surrounding said countershaft and attached to said gear and said worm, a motor driving said gear, a notched disk integral with said sleeve, and means to simultaneously stop the disk and deprive the motor of current.

2. A damper controlling device comprising a shaft, a plurality of fixed Contact members radially positioned about the shaft, a corresponding number of yielding contact members positioned over and each normally in contact with the fixed contact member which is correlated therewith, an arm on said shaft adapted to raise said yielding contact members, means for driving the shaft in one direction, and circuits connecting said contact members, some of said contact members operating in series to open the circuits atv certain positions of the damper from either of two positions of the shaft.

3. A damper controlling device comprising a shaft, a plurality of fixed contact members radially positioned about the shaft, a corresponding number of yielding contact members positioned over and each normally in contact with the xed contact member which is correlated therewith, a motor circuit for operating said shaft, an arm on said shaft adapted to raise said yielding contact members, some of said fixed contact members being connected together and to one line of said motor circuit, a number of circuits connecting some of said yielding contact members corresponding to said last-named fixed members, to the remaining fixed Contact members, and circuits connecting the remaining yielding contact members and the other line of the motor circuit with a regulator.

4. A damper controlling device comprising a thermostat, an electric motor and a damper operating shaft adapted to be ro' tated by said motor, a plurality of fixed contact members radially positioned about said shaft, a corresponding number of yielding contact members positioned over and normally in Contact with the xed contact member which is correlated therewith, an arm on said shaft adapted to raise said yielding contact members, some of said fixed contact members being connected together and to one terminal of the motor armature, a number of circuits connecting some of said yield ing contact members corresponding to said last named fixed members tothe remaining fixed contact members, circuits connecting the remaining yielding contact members to corresponding fixed contact members of the thermostat, and a circuit connecting the movable member of the thermostat through a source of electrical energy to the other terminal of the motor armature.

5. A damper operating device comprising a shaft, an operating circuit, a motor for driving said shaft, the armature of said motor being connected across said circuit, a catch for quickly stopping said shaft, an electromagnet for releasing said catch, said electromagnet and the field of said motor being connected in series across said line, a short circuit including a switch shunting said field, said switch being-operable from said electromagnet so that when said catch 1s engaged with said shaft said short circuit is closed and the motor rendered inoperable.

6. A damper operating device comprising a shaft, a motor driving said shaft, a catch for quickly stopping said shaft, an electromagnet for disengaging the catch from the shaft, and electrically-operated means for impressing the total voltage upon the electromagnet when starting the device and for reducing the same when said catch has been released.

In testimony whereof I affix my signature in presence of two witnesses.

EVERETT H. WHITE.

Witnesses:

F. A. IVI-IITELEY, H. A. BOWMAN.

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