US1120619A - Diaphragm-horn. - Google Patents

Description

M. R. HUTGHISON.

DIAPHRAGM HORN.

APPLIGATION FILED AUG. 26, 1014.

Patented Dec. 8, 1914.

purpose.

' E STES PATENT FIQE.

MILLER REESE HU'ICHISON, OF WEST ORANGE, NEW JERSEY, ASSIGNOR T0 LOVELL- MOCONNELL MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

DIAPHRAGM-HORN.

Specification of Letters Patent.

Patented Dec. 8, 1914.

Original application filed October 26, 1909, Serial No. 524,762. Divided and this application filed August 26, 1914. Serial No. 858,676.

T 0 all whom it may concern:

Be it known that I, MILLER Rnnsn Huron- ISON, a citizen of the United States, and a resident of West Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Diaphragm-Horns, of which the following is a specification.

My present invention relates to horns or signaling devices wherein a diaphragm is vibrated by a rotary cam mounted on a suit able shaft such for instance as the armature shaft of an electric motor. In my prior Patent 923,122, I have disclosed one form of motor, motor support and cam to operate the diaphragm, and in my co-pending application, Ser. No. 524,762, filed October 26th, 1909, of which the present application is a division, I have shown other forms in which I employ such an arrangement of parts that the vibrator} motion of the diaphragm may be derived from the armature shaft of an electric motor, with such shaft arranged at an angle to the plane of the dia phragm instead of parallel therewith. This is particularly desirable, since it permits a compact arrangement of the electric motor within a case which need not extend peripherally outside of the circumference required for inclosing the diaphragm. In the particular form hereinafter described, the mo tor is arranged with its armature at an acute angle to the diaphragm, and the axis of the shaft is out of alinement with the center of the diaphragm. By means of this arrangement, the center of mass or volume of the motor may be brought close to a perpendicular from the center of the diaphragm, and at the same time the cam surfaces adjacent to the periphery of a rotor may operate at the center of the diaphragm.

My invention involves other features of importance which will be pointed out in connection with the description of one prac tical embodiment thereof shown in the accompanying drawing in which the figure is a vertical section longitudinally of the drive shaft, the motor being shown in elevation.

In the drawing the horn or resonator 1, front case 2, peripheral flange 3, diaphragm 4, clamps 5, 6, and cork-like gaskets 7 8, are of any known construction suitable for the The wear piece 72, secured to the center-of the diaphragm, may be of any known or approved construction, but is preferably formed for straight line contact with the rotary displacing member. The drive shaft 10 carries a rotary member 70 provided with teeth or projections 76, the latter being projections on a bevel face, preferably cut in accordance with the well known principles similar to those established for teeth of bevel or crown gears, so that their sliding engagement with the diaphragm projection 72 will not vary much with its axial projections intersecting at a point eccentric to the diaphragm by an amount approximately equal to the radius of the face cam. Obviously, the eccentricity of the axial projection of the motor shaft may be decreased by decreasing the diameter of the face cam or by tilting the motor to a greater extent, but preferably the center of mass or volume of the motor, lies practically in a line perpendicular to the axis of the diaphragm. The size of the rotary member 70, the angle of inclination of the axis and the eccentricity of the point of intersection of axial projection of shaft and diaphragm are preferably interdependent in order to keep the mass of the motor close to a line perpendicular to the diaphragm passing through the center thereof. By this arrangement the motor may he brought well within the periphery of the diaphragm clamps 5, 6 and aseparate case 73 for the motor may be employed which is also of less diameter than said clamps and is symmetrical with respect to the axis of the horn 1. The teeth or projections 76 on the rotor and the wear piece on the diaphragm are formed so that the elements thereof produce true contact and are substantially parallel with the diaphragm. Thus the angle of the axis and the angle or bevel of the teeth are interdependent. The rear clamp 6 of the diaphragm involves an important feature of my invention. It carries preferably integral therewith, an arm 74 having an inclined upper surface to which the motor is detachably connected by a bolt 7 5 passing through a slot 7 6 shown in dotted lines. This support and connection for the motor should be formed so that adjustment of the rotary member 70 to and from the wear piece ?2 on the diaphragm may be effected. In form shown such adjustment is permitted by the slot in the arm and is along a line parallel to the axis of the motor.

. By reason of the angular mounting of the motor shaft, a given axial adjustment produces a lesser movement of the rotor diprovided with an ordinary thrust bearing for the armature shaft within the boss 78. With this construction the parts may all be assembled and tested without the rear case, the latter being applied over the flange 79 and secured thereto as by screws 80. The inclined arrangement of the drive shaft has the further advantage that the device may be secured in position so that gravity keeps the shaft normally in contact with the rear thrust bearing, thereby insuring uniform extent of overlap of camand wear piece regardlessof any endwise play of the shaft such as is usually provided for to insure free running in small electric motors of the type here contemplated. This tends to make starting easier and more certain as the cam is always at its maximum distance from the diaphragm. It also eliminates the possibility of slight endwise chattering of the shaft such as is likely to occur under certain conditions, particularly at starting and stopping when the cam contacts are least har monious with the natural bodily swing of the diaphragm.

While I have herein fully shown and described, and have pointed out in. the appended claims certain novel features of construction, arrangement, and operation which characterize my invention, it will be understood by those skilled in the art that various omissions, substitutions, and changes in the forms, proportions, sizes, and details of the device and of its operation, may be made without departing from my invention.

Having thus described my invention, what I claim as 'new and desire to secure by Letters Patent, is

1-. In an alarm or signaling device, a diaphragm, and mechanical means including a drive shaft disposed at an acute angle to said diaphragm for vibratipg the latter in combination with means for supporting said parts with the center of volume of the driv ing mechanism close to a line "passing through the axis of the horn and the center of the diaphragm.

2. In an alarm or signaling device, a diaphragm, and mechanical means including an electric motor for vibrating said diaphragm in combination with means for supporting said parts with the motor shaft at an acute angle to the plane of the diaphragm, and with the center of mass of the motor substantially in a line noymal to the diaphragm at the center of the latter. M

3. In an alarm or signaling device, adiaphragm and mechanical means including an electric motor for vibrating said diaphragm in combination with means for supporting said parts with the motor shaft at an acute angle to.the plane of the diaphragm, the

motor and diaphragm being proportioned and arranged so that the mechanical driving means does not project peripherally beyond the circumference of the diaphragm supporting means, together with a case conforming to and including all said parts.

4. In an alarm or signaling device. a diaphragm normally disposed in a substantially vertical plane and having a wearpiece, an electric motor having the axis of its shaft disposed at an acute angle to the plane of the diaphragm and inclined downwardly and rearwardly from a point above said Wearpiece and the center of mass of the motor being substantially in a\line normal to the diaphragm and passing through said wearpiece, and a rotor on the shaft of said motor and having its center above said wearpiece and presentin beveled projections adjacent its periphery for engagement with the latter.

5. In an alarm or signaling device, a diaphragm having a Wearpiece, a beveled face cam for vibrating said diaphragm and a shaft carrying said rotor and disposed at an acute angle to the plane of said diaphragm,'

the inclination of said shaft and the angle of bevel of said face cam being proportioned to produce line contact between cam and Wearpiece.

6. In an alarm or signaling device, a diaphragm having a wearpiece, a rotor presenting cam projections for engagement with said wearpiece to vibrate said diaphragm, a shaft supporting said rotor and disposed at an acute angle to the plane of said diaphragm, a motor for rotating said shaft the center of mass of said motor being sub stantially in a line normal to said diaphragm and passing through said Wearpiece and the inclination of said shaft and the size of said rotor being interdependent.

s. In an alarm or signaling device, a diaagainst which said shaft is retained by gravity.

8. In an alarm or si aling device, a diaphragm, a drive shatt presented endwise to said diaphragm and adjustable in a direc tion at an acute angle to said diaphragm, and a rotor carried by said shaft for vibrating said diaphragm.

9. In a horn or signaling device, a diaphragm, a diaphragm clamp having a slotte'd bracket integral therewith and present ing the downwardly and rearwardly inclined upper face, and an electric motor mounted on said bracket and adjustable along said inclined face.

10. In an alarm or signaling device, a diaphragm normally disposed substantially in a vertical plane, a diaphragm clamped for engagement with the peripheral portion of said diaphragm and having an arm extending rearwardly therefrom and presenting a downwardly and rearwardly inclined upper face, an electric motor mounted on the inclined upper face of said arm and having its center of mass substantially in a line at ri ht angles to the diaphragm at the center oi? the latter, means for adjusting said motor bodily toward and. from said diaphragm and a rotor carried by the armature shaft of said motor and disposed above the center of said diaphragm and presenting beveled cam projections for engagement with the diaphragm substantially at the center of the latter.

11. In an alarm or signaling device, a diaphragm, a diaphragm clamping member having a r earwardly projecting annular flange and an arm integal with said flange and within the periphery of the latter and projecting rearwardly therefrom, and having a slot extending lengthwise thereof, a high speed, rotary, electric motor, means extending through said slot for detachably and adjustably securing said motor to said arm, and a thin sheet metal case inclosing said motor and said arm and telescoping with and detachably secured to said flange.

12. In an alarm or signaling device, a diaphragm, a diaphragm clamping member having an arm integral therewith and projecting rearwardly therefrom, adjacent one edge only of the diaphragm and having a slot extending lengthwise thereof, a high speed, rotary, electric motor having its shaft presented endwiseto said diaphragm, means .earried by said motor for vibrating said diaphragm, means extending through said slot for detachably and adjust-ably securing said motor to said arm, and a thin sheet metal case inclosing said motor and arm and detachably secured to said clamping member.

Signed at \V est Orange in the county of Essex and State of New Jersey this 24th day of August, 1914.

MILLER REESE HUTCHISON.

Witnesses FREDERICK BAOHMANN, A. B. M. EsnoL1n.

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