US1587059A - Diaphragm signal - Google Patents

Description

June 1 1926.

P. H. WITHINGTON DIAPHRAGM SIGNAL Filed March 30, 1923 l as steel, of which the diaphragm is formed.

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diaphragm Patented dune l, 1926,

'mrn" PHILIP H. VTITHINGTQN, U15

CLEVELAND, OHIU, ASSIGNOR TO THE SPARKS-WITHINGl- TQM CQMEAHY, 0F EACKSGN, MICHIGAN, .A CORPORATION OF (EH10.

nrarnnaen srenari.

Application filed awn so, was. Serial No.628fi83.

lhis invention relates to a new and improved diaphragm signal and more particularly to the specific form and construction of the diaphragm thereof.

The main object of the invention is to effect a substantial saving of the material such Further, with this construction, buckling of the diaphragm ordinarily caused by the fact that the clamping surfaces are not absolutely flat is practically eliminated,

Further, a comparatively small area of the edge of the diaphragm is clamped between the case sections and therefore, the is allowed to flex more easily.

Qther objects and advantages relate to the details of form and construction of the apparatus, all as will more fully appear from the following description, taken in connection with the accompanying drawings, in

which I t Figure 1 is an elevation of the diaphragm and front case section showing the clamping bolts in section.

Figure 2 is a longitudinal section of the signal. V

Figure 3 illustrates the method of blanking the diaphragm from a strip of sheet metal.

In general form, the signal here illustrated is of a well known type, and construction, embodying a rear case section '1 of dished form and a of oppositely dished form, the edges or peripheries of the case section being substantially flat and adapted to receive between them the edge of a diaphragm 3, preferably formed of sheet metal.

In the well known construction of diaphragm signals, the edge of the diaphragm is preferably separated from the clamping peripheries of the case sections 1 an -2- by means of cork washers 14 or other suitable eries of the case sections and thru the clamping washers -14.'-. With the usual confront case section 2- Clamping bolts -15- are provided extending through the periphlar number of clamping bolts. The diaphragm 3- as illustrated, is of peculiar and novel form. It is in general outline of polygonal form.

In this particular illustration which at present is deemedto constitute a preferred embodiment of my invention, the diaphragm -3 is generally octagonal with alternate sides of arcuate' form and alternate sides of straight form. The arcs of the'alternate arcuately shaped sides l-, -5, -6 and -7- are preferably as shown, portions of the circumference of the same circle and the straight sides 8-, -9, -l0 and llare alternately arranged between the arcuate sections, and the surfaces 8 and -10- are diametrically opposite each other, while the surfaces 9' and -Tl1- are diametrically oppositeeach other, the two diameters being approximately perpendicular to each other.

lit will be noted that the diameter of the tions is considerably less than the diameter of the case section'1 or the case section 2, and that the arcuate edges of the sides l, -5, 6 and -7- are portions of the circumference of a circle of somewhat less diameter than the circle defined by the outer side of the bolts .15 which bolts are themselves concentrically arranged about the center of the case sections 1- and 2,. Preferably these arcuate surfaces in tersect the bolts 15 substantially at a diameter of the bolts and peripheral grooves or recesses -12- are formed sides -4, 5-, 6 and stantially semi-circular form, and with diameters a proximately the same as the diameters of't e bolts -15 so as to tightly receive a portion of the bolts, as for instance,

7 of subd substantially one-half of each bolt.

Further one of the arcuate sides, such as ]7-, is formed with a positioning or locating groove 13' for locating pin or stud 24- formed in connection with the case section 2.

For illustration, it is found that the diaphragm of this invention can be made or blanked from a sheet 4%,?" in width where it now requires a stripbf in width to produce a diaphragm as ordinarily manufacturedfor a horn of the same size or with case sections of the same diameter. Thus, a material saving is eflected'inthe amount cooperation with a' Bil around the edge thereof,

of material re uired because of the reduction in the wi th of the sheet, and at the same time, the dia hragm being shortened both laterally and longitudinally of the strip, a greater number of diaphragms can be blanked from a strip of predetermined length and a very substantial saving in this perhaps most expensive material of diaphragm signals is effected.

The diaphragm -3 in the usual manneris provided with a wear piece -Q5 at substantially its central portion for co-oper ation with the rotary cam 16 carried on the armature shaft 17- of an electric motor (not shown). The front case section in the usual manner may carry an amplifier or horn 18 while the rear case section 1 may carry in the usual manner a motor-enclosing case l9.

Altho I have shown and described a specific form and construction of device as constituting a perhaps preferred embodiment of my invention, I do not desire to restrict myself to the various changes may be made within the scope of the appended claims.

I claim:

1. In a signal, the combination with two circular case sections and connecting bolts arranged concentrically around the edge thereof, of a diaphragm having its outer edge clamped between the case sections and lying Within a circle defined by the outer side of said bolts, and grooves in the edge of said diaphragm for receiving portions of the bolts.

2. In a signal, the combination with a circular case section and connecting bolts extending through and arranged concentrically of a diaphragm of polygonal form with alternate sides of arcuate shape, and alternate sides substantially straight and bolt-receiving grooves in the arcuate shaped sides.

3. In a signal, the combination with a, circular case section and connecting bolts extending through and arranged concentrically around the edge thereof, of a dia phragm of polygonal form with alternate sides of arcuate shape, alternate sides sub stantially straight, bolt-receiving grooves in the arcuate shaped sides, and the edgeof the arcuate sides lying within the circle defined by the outer side of said bolts.

4. In a signal, the combination with two circular case sections and connecting bolts arranged concentrically around the edge thereof, of a diaphragm having its outer edge clamped between the case sections and lying within a circle defined by the outer side of said bolts, grooves in the edge of said diaphragm for receiving portions of the bolts, the arcs of the arcuate sides formdetails of form, as

of a regular memes ing portions of the circumference of the same circle.

5. In a signal, the combination with a circular case section and connecting bolts extending through and arranged concentrically around the edge thereof, of a diaphragm of polygonal form with alternate sides of arcuate shape and alternate sides substantially straight, bolt-receiving grooves in the arcuate shaped sides, the arcs of the arcuate sides forming portions of the circumference of the same circle.

6. In a signal, the combination with a circular case section and connecting bolts extending through and arranged concentrically around the'edge thereof, of a diaphragm of polygonal form with alternate sides of arcuate shape, alternate sides substantially straight, bolt-receiving grooves in the arcuate shapedsides, and the outer edge of the arcuate sides lying Within the circle defined by the outer side of said bolts, the arcs of the arcuate sides forming portions of the circumference of the same circle.

7. A diaphragm in the form of a regular polygon with alternate sides substantially flat and bolt-receiving grooves in the edge of the sides between the substantially flat sides.

8. A diaphragm substantially in the form of an octagon having alternate sides formed with bolt-receiving grooves.

9. A diaphragm substantially in the form of an octagon having a plurality of its sides formed with bolt-receiving grooves.

10. In a signal, a diaphragm in the form polygon with alternate sides arcuate, the arcs of the arcuate sides forming portions of the circumference of the same circle, and bolt-receiving grooves in the arcuate sides.

11; In a signal, a diaphragm in the form of a regular polygon with alternate sides arcuate and alternate sides straight, the arcs of the arcuate sides forming portions of the circumference of the same circle, and boltreceiving grooves in the arcuate sides.- 12. In a signal, a diaphragm of octagonal form with alternate sides arcuate in form, the arcs of the arcuate sides forming portions of the circumference of the same circle, and bolt-receiving grooves in the arcuate sides.

13. In a signal a diaphragm of octagonal form with alternate sides arcuate in form, and alternate sides substantially straight, the arcs of the arcuate sides forming portions of the circumference of the same circle, and bolt-receiving grooves in the arcuate sides.

In Witness whereof I have hereunto set my hand this 13th day of March. 1923.

' PHILIP H. WITHIN GTON.

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