US2650410A

US2650410A - Mold form

Info

Publication number: US2650410A
Application number: US267044A
Authority: US
Inventors: William E Mitchell
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-01-18
Filing date: 1952-01-18
Publication date: 1953-09-01
Anticipated expiration: 1970-09-01

Description

INVENTOR.

3 Sheets-Sheet 1 William E. Mitchel! l l l U l I l l l I w. E. MITCHELL MOLD FORM Fig.1

Sept. 1, 1953 File d Jan. 18, 1952 Sept. 1, 1953 w. E. MITCHELL MOLD FORM 3 Sheets-Sheet 3 Filed Jan. 18, 1952 oo 6 a w m/ 2 M. h m cm n in I l A Mfio am a O 20 v m 7 1, an m rm v .I H. 2 lrm. I4 w M I 6 I F 2 mm w M 22 4 m a i .F... 0 0 Q Qi e 0o oo oo oo J M 2 0 H m F 0 6 0 4 8 0 m mm D ml, r 1!.

Patented Sept. 1, 1953 UNITED STATES PATENT OFFICE Claims.

This invention relates to a mold form and particularly to a mold form for casting concrete inlet in road construction.

In the construction of modern roadways it is customary to drain the road surface by means of so-called inlets which are arranged at the edge of the travelled surface and have at least a portion of the opening extending onto the travelled surface and having it closed by means of a grating over which vehicles or other traific ma pass. It is customary to form these inlets by providing suitable mold structures and casting cementitious or concrete aggregates between the mold form structures so that a complete unitary concrete structure is formed. Heretofore these mold structures have been constructed from wooden members and have been extremely expensive both in materials and time. The recent increase in cost of timber material has greatly augmented the difiiculty in connection with wooden forms. Also, the scarcity of skilled labor for building such forms has greatly retarded road construction.

The present invention provides an inlet mold structure constructed substantially of standard steel forms particularly standard steel channel forms. The channel forms being connected in edge to edge relation by means of bolts or other suitable fasteners secured to the adjacent flanges and the outer walls being arranged in successive vertical and horizontal position so that the walls automatically reenforc each other.

It is an object of this invention to provide a steel mold for concrete inlets.

It is a further object of this invention to provide a steel mold which is separable for removing from the finished cast.

It is a further object of this invention to provide a steel mold which is self-supporting.

It is a further object of this invention to provide a steel mold constructed of standard steel shape.

It is a further object of this invention to provide a steel mold in which the inner mold member may be supported on the outer mold member.

It is a further object of this invention to provide an inlet mold in which the inner form may be readily adjusted with respect to the outer form.

It is a further object of this invention to provide an improved inlet form having means for molding in the seat for receiving the necessary traific carrying grating.

It is a further object of this invention to provide a steel mold which can be readily adjusted to various sizes.

It is a further object of this invention to provide a steel mold which may be readily demounted from the finished inlet structure.

A- further object of this invention is to provide frame means for providing chamiered edges on the tops of the casting.

It is a further object of this invention to provide a mold which can be assembled readily with unskilled labor.

Other objects and many of the attendant advantages of this invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings in which:

Figure l is a rear elevation of the exterior form of an inlet mold according to this invention;

Figure 2 is a front elevation of the exterior form of an inlet mold as shown in Figure 1;

Figure 3 is a side elevation of the exterior forms of Figures 1 and 2;

Figure 4 is a top plane View of the mold;

Figure 5 is a front elevation of the interior mold form of an inlet mold;

Figure 6 is a rear elevation of the interior mold form;

Figure '7 is a side elevation of the interior mold form;

Figure 8 is a top plan view of the interior mold form;

Figure 9 is a cross section through the inlet mold taken substantially on the plane indicated by the line 9-4 of Figure 3;

Figure 1D is a vertical section taken substantially on the plane indicated by the line Ill-l0 of Figure 1;

Figure 11 is a vertical section taken substantially on the plane indicated by the line ll--ll of Figure 3;

Figure 12 is an enlarged fragmentary section taken substantially on the plane indicated by the line [2-42 of Figure 4 showing the methods of adjusting and securing the cross beam supporting the inner mold on the outer mold;

Figure 13 is an enlarged fragmentary section taken substantially on the plane indicated by the line i3-I3 of Figure 4 showing the method of mounting the chamfer producing frame on the mold forms;

Figure 14 is a top plan View of the finished inlet with a portion of the grill broken away;

Figure 15 is a vertical section through the inlet taken substantially on the plane indicated by the line Iii-15 of Figure 14; and

Figure 16 is an enlarged fragmentary vertical section taken substantially on the plane indicated by the line l6--l6 of Figure 14 showing the steel seat embodied in a concrete seat in the finished inlet wall.

In the exemplary embodiment of the invention the mold consists of an inner form l0 and an outer form 12, the outer form consisting of a rear Wall 14, a front wall I 6 and side Walls l8 and 20. The rear Wall [4 is constructed of a plurality of channel plates 39 arranged in edge to edge relation and having the edge flanges 32 of each of the channel plates 25 connected to each other by means of suitable separable fasteners such as bolts 34. The flange of the channel members 39 being assembled in edge to edge relation to provide the necessary height for the back wall I4.

The side walls I8 and 2d are constructed of channel members 36 arranged in vertical formation and having the edges 38 arranged in edge to edge relation and connected by means of bolts'dil. Various widths of channels 38 may be assembled to provide any desired width of the walls I8 and 2d.

The rearmost flanges 42 of the walls It and 29 are connected to the webs 44 of the channels 3i! providing the rear wall so that the flange E2 of theside walls rigidly reenforces the back wall Id so that it is in rigid self-sustaining relation. Preferably the connection of the flanges to the webs is made by means of suitable separable fasteners such as bolts 46.

The front It through which the drain connection or pipe extends is modified slightly from the construction of the rear wall i4 and has a plurality of channel members 52 arranged in edge to edge relation and being connected together by means of bolts or other suitable fasteners 5d. The channels 52 are connected to the front flanges of the side walls I8 and 28 and therefore rigidify the structure the same as the channels 30 rigidify the back section. A portion of the front wall is constructed of a pair of plates 55 and 58 which extend into abutting relation and has an end of each plate attached to the flanges 6B which form the front flanges of the walls I8 and 2E3. An angle member 52 has a flange edge thereof attached to the bottom flange of the channel members 52 and the plates 55 and 58 overlap the lower edge of the web of the flange and are secured thereto by means of bolts 64. In this structure the angle member provide the rigidity necessary for maintaining the form against the weight of the concrete when it is first cast therein while the plate provides the necessary structure in which the pipe as may be mounted. The

plates

56 and 58 are provided with arcuate surfaces lo and '52 which provide a substantially circular opening at the abutting ends of the

plates

56 and 58, adjusting plate M and I6 are provided with arcuate faces 18 and 8?] which are substantially in conformity to the arcuate surfaces It and. E2. The plates M and IE are connected to the plates as and 58 respectively by means of bolts 82 and 8 1 which extend through horizontal slots 86 in the plate 55 and slot 38 in the plate 58 so that the plates I i and I6 are readily adjustable to and from each other to control the size of the opening therebetween. Preferably the plate I4 is provided with vertical slots 95 and plate It is provided with vertical slots 92 for engagement respectively with the

bolts

82 and 84 so that the plates I4 and I6 may be vertically adjusted as well as laterally adjusted on the plates 55 and 58 to conform to the size and shape of any pipe 56 which may be introduced through the opening. Horizontally extending plate 94 extends across the abutting edges of the

plates

56 and 58 and is made vertically adjustable by means of the

vertical slots

96 and 98 so that the plate 96 may be adjusted upwardly or downwardly over the edge of the opening between the plate to readily abut against any pipe 553 which may be inserted through the opening therein. A similar plate I60 is connected below the pipe as and is connected by means of bolts I92 and it i to the plates is and 58 and is likewise vertically adjustable and may if desired be provided with an arcuate set-out portion I05. It will thus be seen that the front wall in addition to being rigid is provided with an adjustable opening into which a pipe may be inserted and the mold form accurately adjusted thereto so that the cementitious material will have little or no leakage space therearound. It is usually desirable to have an extension or footing in front of the front wall and under the pipe 55 and for this purpose a short channel extension I08 is secured to the front flange fill of the side walls It and 29 and horizontal channel members Hi] and I !2 are secured to the extension by means of suitable bolts H 3 and H8. Channel members Ild and [I2 extend in alignment and terminate in spaced relation to each other o that a space I I8 is provided between the ends of the channels Hi! and H2 and bar member I2l is connected across this space to rigidify the structure and provide a mold form for retaining cementiti'ous material thereagainst.

The rear wall IQ is a noticeably amount higher than the front wall It so that a rear wall may be cast on the inlet which is higher than the front wall. Likewise the channel members adjacent the rear wall M are of greater length and extend upwardly further than the remaining channel members of the sides Iii and 2c.

The inner mold It is constructed as having side walls 533 and I32 constructed of vertically arranged channel members arranged edge to edge and bolted together into a solid formation. By means of bolts I38 the front wall members its and the rear wall member I463 are constructed of angle plates which will presently be described.

The vertically extending angle member I34 of the walls I36 and i 2 may be selected at any de sired number and width to produce the necessary dimensions of the side walls I32? and I32. Each of the corners of the inner mold is provided with an angulated channel I42 which is constructed by taking the channel member and bending it through the longitudinal axis thereof to provide a corner member or angle having inturned flanges at each of the edges thereof. The angles I40 are angulated channels having flanges IM and M5 with the angle channel flange I45 connected to the flanges bid of the channels I34. The front wall I33 is constructed of a flange plate which is conveniently constructed by taking a plurality of angle members having flanges and webs and cutting out portions I52, I5 and I56 and arranging them in rectangular formation with the corners welded as shown in Figure 11 the interior of the plate being filled in by means of a rectangular plate welded in position. Flanges of the plate I 38 are detachably connected to the angulated corner pieces so that the structure is substanflange of the front wall I38 and is arranged substantially in the plane of the exterior surface of the wall so as to form a substantial continuatzon of the wall. The beam I16 extends outward- 1y past the outer walls I8 and 20 and is received in U-shaped slots I18 and I80 in the walls I8 and 20. The U-shaped slots I18 and I80 are provided with U-shaped angle members I82 and I84 an adjusting screw I86 is mountedin the bot tom of the U-shaped members I18 and I80 and is adjustable upwardly therethrough and is locked in adjusted position by means of lock nuts I88 and I90. The screws I86 contact the bottom of the beams I16 so that the beams I16 may be vertically adjusted within the slots I18 and I80 so that the inner mold structure may be rel atively adjusted with respect to the side members of the outer frame structure.

Preferably the beam structures I16is composed of a channel member I94 having the open side thereof closed by a plate I96 welded or otherwise secured across the flanges of the channel. The side flanges of the U-shaped members I84 and I82 are provided with a series of openings I98 in which fasteners 200 such as a bolt may be inserted so that the beam I16 is rigidly connected to the end walls I8 and 20 to rigidify the structure thereof. Since the weight of the concrete might cause the vertically extending channel members to be bowed outwardly the beam is rigidly connected to both of the side walls I8 and 20 so that they cannot bow outwardly under the weight of the concrete therein.

It will thus be seen that the beam I16 serves the double purpose of reenforcing the end walls of the outer frame and supporting the inner frame on the outer form.

In a similar manner a beam 202 is supported on U-shaped brackets 204 and 206 and supports the rear wall of an inner form in adjusted position with respect to the outer form. The beam 202 together with hood I provides an expanded rear wall on the inner form which provides a space or mold form higher than the front portion of the form so that a high rear wall may be cast therein. The hood portion I10 extends inwardly over the inner mold form so that it presents an underside structure to provide a lift 210 on the finished inlet form. In the construction of an inlet it is necessary to provide a seat for the grating which covers that portion of the opening over which the traffic passes. This is accomplished by means of a pair of seat forms 220 and 222 each of which are composed of box-like forms having an

outer channel member

224 and 226. The outer channel forms being closed by means of

plates

228 and 230 secured across the open ends of the flanges of the channel preferably by welding. Each of the closure plates have box-like seat holes and isprovided with a plurality of longitudinally extending slots 232 and to 234 in which is .slidably connected fastening members such as bolts 240. The side walls I32 and I30 are likewise provided with vertically extending slots 242 in which the bolts 40 are vertical sliclable and may be secured by means of nuts 246 to adjustably secure the box-like forms in any desired position on the exterior surface of the inner mold side walls.

Angular metal seats 250 may be detachably secured to the lower outside corner of the seat molds so that when the finished structure is cast the seats will have reenforcing iron or metal corner members. Preferably the metal seats 250 are temporarily secured to the box-

like forms

220 and 222 by suitable flexible fasteners such as wire 252.

As hereinbefore set out the rear wall I4 is higher than the front wall I6 while the adjacent channel members of the side walls I8 and 20 are of increased height and together with the hood I 10 and the beam 202 enclose a substantially rectangular top portion 260 and in which the top or extended portion forming the curb of the inlet will be fashioned. Since this top portion of the inlet will be subject to contact with traffic it is desirable to chamfer or round off the exposed corners so that they will not be broken or chipper away by contact with traflic. The space 262 is provided with a chamfering mold in a form of a rectangular frame 210 having upstanding brackets 212 and 214 while the top channels of the rear wall are provided with openings 216 for adjustable connection with a bolt 218 so that the frame 210 may be adjustable with respect to the back wall. Likewise, the beams 202 is provided with openings 280 for cooperation with the bolts 282 for securing the frame 210 on the cross beam 202. The frame 210 is substantially rectangular in formation and is provided with angle shaped side members 283 which extend into the cementitious material to provide chamfered edges 284. Reenforcing bars 286 extend across the sides of the frame 210 to rigidify the same.

In operation of the device the frame is set into a desired opening and the bottom of the frame may be contoured as desired to provide any desired configuration of the bottom of the inlet. The pipe or sewer 50 is connected into the outer mold against the inner mold surface and secured in position by means of the

plates

14 and 16 together with the straps 94 and I00. The inner mold form is adjusted to the proper height by means of the adjusting screws I86 and the entire form rigidified by connecting the cross beams I16 and 202 to the respective U-shaped members on the end walls of the outer frame so that the outer frames will properly support the weight of the concrete material therein. The rear wall of the inlet is provided by means of the upstanding rear wall portions of the molds and the entire mold structure is filled with concrete material between the inner and outer formsto provide the inlet 300 having seats at the opposite ends thereof for seating the grill 304, the top of the back wall or curbing 262 being provided with an inturned edge 2I0 to overlie a portion of the inlet and having chamfered edges 284.

The form is particularly versatile as the size may be readily changed by substituting channel members of different widths for minor changes or adding or removing channels for larger changes of dimensions.

It frequently happens in different jurisdictions that the standard specification calls for cement walls of different thickness. This is of course readily provided in certain of the walls by exchanging one or more channel sections. However, certain transverse members would necessarily be of different length. This is compensated for by constructing the transverse members of sufllcient length to meet maximum specifications and providing a plurality of rows of fastening openings corresponding to other standard specifications.

While for purposes of exemplification a particular embodiment of the invention has been shown and described according to the best present understanding thereof, it will be apparent to those skilled in the art that many changes and modifications can be made therein without departing from the true spirit of the invention.

invention, what is outer form including: a rear wall composed of channel members detachably secured in edge to edge relation and disposed in horizontal position, a pair of side walls composed of channel. members detachably secured in edge. to edge relation and disposed in vertical position, said horizontal membersv being detachably secured to the. edges. of the corner verticalchannels'. of said side. walls, a front Wall. composed of a. plurality of.channelimembersdetachably connectedlinedge to. edge relation, a. pair of plates detachably secured. tov the edge. of. one. of. said channel members,. said channel members and said. plates being detachably secured. to the edge of" the front corner. channels of. said. side walls, an inner form including a pair of side walls. composed. of vertically disposed channel members detachably secured in edge to edge. relation, corner members composed. of angulatedl channel members, front and back plates detachably secured to, said corner channels, supporting beams detachably secured to. said front and rear. plates substantially in the planes ofthe upper edges of said plates, means for detachably securing. said beams to said side walls of saidlouter form whereby bulging of said outer form walls is substantially prevented.

2. Aiorm for casting. inlets comprising walls formed of channel members detachably secured in edge to edge relation, the channel members of two opposed walls being disposed vertically, the. channels of the cross walls being. disposed horizontally, the webs of. the horizontal channels being. detachably secured to the flanges of the corner channel of the walls with vertically disposed channels, an inner form including two opposedwalls formed of. vertically disposed channel members secured in edge to edge relation, angulated channel members detachably secured at each corner of said inner form, flanged plates detachably connected toopposed angulated corners to provide two opposed plate walls, a support beam rigidly secured to the top. of each of said support plate walls, saidbeams being mounted on and. secured to said outer walls formed of vertically disposed channels, said support beams being vertically adjustable with respect to said 'out'eriwalls;

3. A. mold form comprising aback wall composed of horizontally disposed channel members in edge to edge relation, a pair of side walls composed of vertically disposed channel members detachably secured in edge to edge relation, the rear flanges of said side walls contacting the-webs of the channels composing the rear wall, separable fasteners detachably securing said rear flanges to the webs of the channels of said rear wall, a front wall including a plurality of horizontally disposed channel members in edge to edge relation, separable fasteners securing" the front flanges of said side walls to the webs of said plurality'of channelmembers; apair-of plate members disposed in abutting relation, the top edges of said plates being detachably secured to .said side walls, extension members secured ad.-

jacent thebottom edge of said side. walls, channelmembers detachably secured tosaid extension members, inparallel relation to said front wall,, said channel members terminating in aligned spaced relation, means detachably connecting, said channel member in substantially rigid relation; 7

4 An inner mold form including apair of side wallscomposed of vertically disposed channel members in edge to edge relation, the abutting flanges being. detachably connected. together, angulated cornerchannels secured to said. side walls, a front. wall including a flanged plate, the side flangesv of said plate. being detachably con.- nected to the flanges of said angulated corner channels a substantially horizontally disposed beam, the upper flange of said. plate beingv detachably secured to the bottom of said beam, a baclewallv including aiianged plate, a hood having a flanged edge, the flange of said hood being detachably secured'to. thetop flange of said. back flanged plate, the top. of. said hood extending inwardly of said form. and terminating in substantially extending relatioma second beam substantially parallel to said first mentioned beam, said hood being. detachably connected to said second beam,.said beams extending laterally beyond said side walls.

5. A. moldform. comprising a, back wall cornposed of. horizontally disposed channel, members inedge to edge relatioina pair ofsid'e' Walls composed of vertically disposed channel members detachably secured. in edge to edge relation, the rear flanges of said side walls contacting the webs of the channels composing the rear wall, the channels of. said rear wall being, detachably secured to saidrear flanges, a front wall including. a plurality of horizontally disposed. channel members in edge to edge relation, separable fastenersisecuring the front flanges of said side walls to the Webs of said plurality of channel members, a air of pipereceiving plate members disposed' in. abutting relation, said plates being detachably secured to the bottom flange of said lurality of channel members and to the front flanges of said; side walls, said: plates terminating in spaced relation to the bottom of said side walls, extension members. secured at the bottom edge of'said side walls, a channel member detachably secured to each oisaid extension members, said channel members terminating in aligned spaced. relation, means detachably connecting said channel? member in substantially rigid relation, an inner mold form including a pair of side walls composed of vertically disposed channel members. in edge to edge relation, the abutting flanges being detachably connectedtogether, angulat'ed corner channels secured to said side walls, a front Wall including a flangedplate; the side flanges of said plate" being detachably connected to the flanges of said angulated corner channels, a substantially horizontally disposed beam, the upper flange of said plate bein detachabiysecured to the" bottom of said beam, a back wall. including a flanged plate, a hood having a flanged edge; the flange ofsa'id hood being detachably secured to the top flange of said back flanged plate, the top of said hoodextending inwardly of said form and'ter'minating in substantially extending relation, a second beam substantially parallel. to said first mentioned beam, said hood. being. detachably connected to said second beam, said beams extendinglaterally beyond said side walls.

6.. A mold form. comprising, a back wall composed of horizontall; disposed channel members in edge to edge relation, a pair of side walls composed of vertically disposed channel members detachably secured in edge to edge relation, the rear flanges of said side Walls contacting the webs of the channels composing the rear wall, said rear flanges being detachably secured to the channels of said rear wall, a front wall including a plurality of horizontally disposed channel members in edge to edge relation, separable fasteners securing the front flanges of said side walls to the webs of said plurality of channel members, a pair of pipe receiving plate members disposed in abutting relation, said plates being detachably secured to the bottom flange of said plurality of channel members and to the front flanges of said side walls, said plates terminating in spaced relation to the bottom of said side walls, extension members secured at the bottom edge of said side walls, channel members detachably secured to said extension member, said channel members terminating in aligned spaced relation, means detachably connecting said channel member in substantially rigid relation, an inner mold form including a pair of side walls composed of vertically disposed channel members detachably secured in edge to edge relation, angulated corner channels secured to said side walls, a front wall including a flange plate detachably connected to said angulated corner channels, a substantially horizontally disposed beam, said plate being detachably secured to the bottom of said beam, a back wall including a flanged plate, a hood having a flanged edge, said hood being detachably secured to the top of said back flanged plate, the top of said hood extending inwardly of said form and terminating in substantially extending relation, a second beam substantially parallel to said first mentioned beam, said hood being detachably connected to said second beam, said beams extending laterally beyond said side walls, U-shaped slots in said outer side walls, said beams extending through said slots, said beams being detachably secured in said slots.

7. A mold form comprising a back wall composed of horizontally disposed channel members in edge to edge relation, a pair of side walls composed of vertically disposed channel members detachably secured in edge to edge relation, the rear flanges of said side walls contacting the webs of the channels composing the rear wall, said rear flanges being detachably secured to the channels of said rear Wall, a front wall including a plurality of horizontally disposed channel members in edge to edge relation, separable fasteners securing the front flanges of said side walls to the webs of said plurality of channel members, a pair of pipe receiving plate members disposed in abutting relation, said plates being detachably secured to the bottom flange of said plurality of channel members and to the front flanges of said side walls, said plates terminating in spaced relation to the bottom of said side walls, forwardly extending extension members secured on said side walls adjacent the bottom thereof, channel members detachably secured to said extension members, said channel members terminating in aligned spaced relation, means detachably connecting said channel members in substantially rigid relation, an inner mold form including a pair of side walls composed of vertically disposed channel members detachably secured in edge to edge relation, angulated corner channels secured to said side Walls, a front wall including a flange plate detachably connected to said angulated corner channels, a substantially horizontally disposed beam, the upper flange of said plate being detachably secured to the bottom of said beam, a back wall including a flanged plate, a hood, a second beam substantially parallel to said first mentioned beam, said hood being detachably connected to said back wall and to said second beam, said beams extending laterally beyond said side walls, U-shaped slots in said outer side walls, said beams extending through said slots, said beams being detachably secured in said slots, adjusting means for vertically adjusting said beams in said slots.

8. A mold form comprising outer side walls composed substantially of channel members detachably secured together, inner side walls composed substantially of channel members detachably secured in edge to edge relation, front and back plate members secured between said inner side walls, horizontally extending beam members secured at the top of said front and back plate members, vertical U-shaped slots in said outer side walls, said beams being received in said slots, flanges about said slots, a vertically extending threaded member secured in the bottom of said U-shaped flanges, said threaded member adjustably supporting said beams in said slots, means detachably securing said beams to the sides of said U-shaped slots.

9. A mold form including inner and outer mold members, back walls on said inner and outer mold members, saidback walls extending above the front walls, that portion of the outer side walls adjacent the outer back wall being of greater height than the front walls, a beam secured to said inner back wall and being connected to said outer side walls, a frame slidably received in the space enclosed by said back walls and said side portions, means for adjustably securing said frame in said space said frame being constructed of tapered members whereby a casting in said space is provided with chamfered corners.

10. A mold comprising an outer form, an inner form, supporting means secured to said inner and outer forms for supporting said inner form in said outer form, said inner form being spaced from said outer form, and seat molds secured to said inner form, each of said seat molds including a box-like member, including a channel member, a closure plate secured across the flanges of said channel member, a pair of longitudinally extending slots in said closure plate, bolts slidably mounted in said slots, vertically arranged slots in said inner form, said bolts being slidably received in said vertical slots and means for securing said bolts to fasten said seat forms in adjusted position.

WILLIAM E. MITCHELL.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 584,953 Mowrey June 22, 1897 798,797 Johnson Sept. 5, 1905 966,961 Smith Aug. 9, 1910 1,014,360 Allen Jan. 9, 1912 1,038,986 Stretch Sept. 17, 1912 1,235,542 Bagby Aug. 7, 1917 1,547,036 Hedrick July 21, 1925 1,670,338 Butterwor-th May 22, 1928 1,694,292 Tracey Dec. 4, 1928 1,897,340 Sielafi Feb. 14, 1933 1,948,931 Mears Feb. 27, 1934 2,186,097 Burns Jan. 9, 1940 2,236,616 Bosco Apr. 1, 1941