US1474014A - Electric bell - Google Patents

Description

Nov.

R. B. BENJAMIN ELECTRIC BELL Filed Marcl:Z%, 1919 3 Sheets-Sheet 1 R. B. BENJAMIN Nov. 13

ELECTRIC BELL 1919 3 Sheets-Sheet 2 Filed March 1 Nov. 13 1923.

R. B. BENJAMIN ELECTRIC BELL Filed March 1,1919 3 Sheets-Sheet 5 Patented Nov. 13, 1923.

UNITED STATES PATENT OFFICE.

REUBEN 1B. BENJAMIN, OF CHICAGO, ILLINOIS. ASSIGNOR TO BENJAMIN ELECTRIC MANUFACTURING COMPANY, 61? CHICAGO. ILLINOIS. A CORPORATION OF ILLINOIS.

ELECTRIC BELL.

Application filed March 1, 1919.

T all whom it may concern Be it known that I, REUBEN B. BENJAMIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Im provements in Electric Bells. of which the following is a full, clear, concise, and exact description. reference being bad to the 3C companying drawing. forming a part .of this specification.

My invention relates to improvements in electric bells. and one of the objects of my invention is to provide an electric bell in which all of the hammer-actuating mecha nism is enclosed in a sealed casing, the actuating mechanism being mounted upon and supported by the casing in such a manner that the casing may be opened for inspection and repair of the parts wilhout disturbing or displacing any of the operating mechanism of; the bell.

Other objects and advantages of my invention will appear more fully in the accompanying specifications and drawings.

For the purpose of disclosing my invention I have illustrated certain embodiments thereof in the accompanying drawings, in which Fig. 1 is a plan view oia bell embodying my invention and having the cover for the casing removed and certain parts shown in section;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a detail view showing means for adjusting the gong;

Fig. 4 is a plan View of another form of hell embodying my invention;

Fig. 5 is a plan view of the bell illustrated in Fig. 4, with the cover removed;

Fig. 6 is an elevational view of the construction shown in Fig. 4, the view being taken from the lower side of Fig. 4, and parts being broken away to show the interior construction; and

Fig. 7 is a side elevational view of the construction shown i Fig. 4. the view be ing taken from the left, and parts being broken away to show the interior construction.

In the embodiment illustrated in Figs. 1 to 3. I provide a cylindrical casing having a side Wall 1 and the bottom 2 preferably formed in one piece. At one point on the side wall of the casing there is formed a Serial No. 280,012.

boss 3 having an opening through which the leading-in Wires are brought. This opening is internally screw-threaded to receive the end of the conduit pipe which leads to the casing and is thereby effectually sealed. or the opening may be sealed in any other suitable manner if desired. A second boss at is formed on the side wall of the casing. which is internally screw-threaded to re ceive a plug 5. A pair of screws 6 and 7 extend through the casing at this point. for a purpose more fully hereinafter described. These screws also pass through a lock plate 8. which may be slightly tilted by the screw 9 which passes therethrough and bears against the wall of the casing to lock the screws against rotation. The casing has its side wall bulged or extended at 10, and within the casing this bulged portion is channeled at ll. to form an upper and lower bearing for a rock shaft 12, which passes through an opening in the top of the bulged portion of the casing and has its lower end seating in the bottom of the bulged portion. The top portion of the casing surrounding the rock shaft is provided with a countersunk opening 13 having a tapering bottom and adapted to receive a suitable packing H which surrounds the rock shaft 12 and is held in position by a countersunk screw 15 surrounding the rock shaft. By this arrangement the point at which the rock shaft passes into the casing is sealed against the entrance of dust. or moisture. The upper end of the rock shaft is bent at right angles and bowed to form a spring hammer arm 16. which at its free end carries the striker or hammer 17 for the bell. The operating mechanism of the bel all mounted on and within the casing and cinnprises an electroniagnet having a pair of windings 18. the cores 19 of which are secured to a yoke 20. which in turn is secured by a pair of screws 21 to a pair of lugs (not shown) project ing upwardly from and formed integrally with the bottom 2 of the casing. An armature 22 lies opposite the poles of the coils 18 and at one end is non-rotatably secured to the rock shaft 12. so that any movement imparted to the armature will operate the rock shaft and, in turn, operate the striker arm 16. The opposite or free end of the armature has connected thereto a relractile spring 23. One end oi this spring is hooked through an opening in the inner end of the screw 6 and the opposite end passes through an opening in the armature and is hooked over a plate 24, which plate. is larger than the opening in the armature. This arrangement permits the spring to rotate with the screw 6 and at the same time connects the spring and armature together. This spring acts to retract the armature from the poles of the magnet when the circuit through the magnet. is broken. and it will be noted that by the arrangement of the screw 6 adjustment of the tension of this spring may he made from the exterior of the casing hy removing the plug 5 from the nipple 4. Mounted within the casing on a pair of lugs .25 extending upwardly from and integrally cast with the hottorn .2 is an insulating hase :36. on which are mounted a pair oi binding plates 27 and 28 carrying binding-posts tor the leading-in wires. These hindingposts are separated from one another by a rib 29 formed on the base. The binding plate 27 has upstanding therefrom a lug 3th to which is secured a flat spring 31 carrying one con tact 32 ot the circuit-breakcr art the opcrating magnet, The free end ol this spring rests upon an insulating tip on the end of the screw T, so that by adjusting the screw 7 the spacing of the contacts of the circuithreaker may be adjusted. and it will be noted that this screw may be adjusted from the ex terior of the casing simply by removing the plug 5 of the nipple l. The terminal plate 9? has an upstanding lug 33 to which is secured the flat contact spring ill of the circuit-breaker. which spring at its free end carries a contact 35 co-opcrating with the contact 32. and is also provided with an insulating tip 36 adapted to pass through an elongated opening 37 in a pin 39 extending from the free end of the armature :22. so that as the armature is attracted by the operating magnet the contacts 32 and 3.7 will be separated. .\t the same time. due to th fact that the opening .37 is slightly elongated. a certain amount of movement of the armature will be permitted hel'in'c these contacts are separated. Formed on the bat-c Qt; is a butter Iii) against which is adapted to strike the free end of a butter spring 4-0 sc cured at one end to the armature 22 and hav ing its tree end slightly separated from the armature. This spring acts as a butter and takes up a certain amount of the jar on the armature due to its return to normal position when the circuit-hriu1ker is opened each time.

The interior of the cylindrical wall l of the casing is screwthreaded to receive the threaded flange 41 ot the cover plate 42. which is thereby secured in position. The edge of the casing wall and the edge of the plate are bevelled. as at 43. to insure a close fit at this point.

The gong 44 is supported hy the cover plate, and to this end there is termed on Ihr cover plate a hollow split post 45. which is exteriorly tapered and scren threaded to re ceive a clamping nut in A stein l? is mounted in the post and has the gong eccentrieally secured thereto at its upper end by a bolt. 48. Due to the eccentric inouuting of the. gong post the gong may be ad justed to and from the striker l7. and a l'ler the proper adjustment has been made. by setting the nut 46 the stem will be securely clamped in the post and the gong held against displacement.

In Figs. 4 to T. inclusive. l have illustrated a modified form of my invention. In the structure illustrated in these figures 1 provide a casin preferably cylindrical in shape and having the cylindrical walls 49 and the bottom 50 preteralily cast in one piece. Formed in the walls at a suitable point is a boss 51 through which the leadlug-in wires are brought and which is in ternally screw-threaded to receive the coir duit pipe. which thereby effectually seals the casing at this point; or the casing may be sealed in any other desired manner. The body of the casing is provided with inte grally cast lugs 52 having openings for at taching screws. and the upper edge oi the walls 49 has an inwardy extending flange 52, to form a seat for the cover plate 5 1. .\t intervals the side wall 19 is thickened or has inwardly extending lugs 55 adapted to re ceive the clamping screws 56 for the cover. At one point on the wall 49 1 form a lug or in turned extension 57. which in eftect forms a portion of the flange 53. The purpose and advantage of this lug will appear more fully hereinafter.

All of the operating parts of the hell are mounted within the casing. and for operating the hell I provide the tonal ele troniagnet. comprising the coils 58 having their cores .39 secured l) screws Ct] to a yoke (31. which in turn is secured by s rews 432 to a pair of lugs (iii cast integrally with and extending up ardly from the bottom 5 Opposite the poles of the magnet is arranged an arn'iature (H- split and drilled at one end and clamped to and supported by a rock shatt which shaft is journaled at its bottom in a post 66 formed integrally with and extending upwardly from the bottom 50 and the lug 57. through which lug the shaft passes. The post. 66 and the lug 57 are spared apart to accommodate the pivoted end of the armature 64 and form the bearings tor the rock shaft 65. which shaft at its upper end is turned at right angles and bowed to form the striker arm (37 of the bell. having a suitable striker 68 secured at its free end. '.\t the point where the shaft passes through the lug or casing a count ersink opening is formed around the shaft. this opening heing tapered at its bottom ill) and adapted to receive a suitable packing 69, which packing: is held in position by a screw surrounding the rock shaft and screwing into the countersink opening. An insulatin c base T1 is mounted within the casing on a pair of upwardly extending lugs 72 and carries the two binding-post; terminal plates ill and H to which the leading-in wires are connected. The binding post terminal plate 73 has an up-turned projection T5, into which is threaded a screw 76 carrying one of the cont at ts 77 ot the circuitbreaker. An angle plate T8 is secured to the base T l. and on the upwardly extending portion oi this plate is mounted a leaf spring 79. the free end of which provided with a hook or lip Hit which engages over an in saluting; linger 81 secured on the free end of the armature iii. whereb the spring T9 acts as a retractile spring for the armature. branch spring 82 is secured to the spring; T9 and carries at its free end the second contact 8?) ol the circuit-breaker. One end of the magnet coils is connected to the hinding-post terminal 73: the opposite end is connected to the spring 79. which in turn is connected to the opposite terminal plate 7-H and it is obvious that as the armature is attracted by the magnet the circuit of the coils will be broken between the contacts Ti and F3 to produce the usual vibratoev movement of an electric bell.

The eoier plate 5-l ot' the casing carries the gong 84. and to this end is provided with a post ha ring a screw-receiving opening at its top to receive the securing screw 86 for holding the gong in position. This cover has a notch 87 formed in its periphery, which notch is large enough to accommodate the rock shaft 65 and its surrounding screw it). but the edge of the notch rests on the top face of the lug 57, so that when the gasket 88 is placed in position and the cover plate (lumped home by means of the screws 56 the cover will make a sealed joint with the us ing at all points, and, due to the tact that the only opening in the casing, which is the opening accommodating the, rock sha ft 65, is packed, the etlSiIlg' is sealed against mois ture and dust.

'hile l have illustrated and described in the accompanying drawings and speeitirations certain embodiments of my invention. it Will he understood that the invention may take other embodiments or changes may be made in those illustrated and described, without departing from the spirit of the invention as set forth in the appended claims.

Havin thus described my invention, what I eiaim as new and desire to secure by Letters Patent. is:

1. An elect rie bell eompi'ising, a sealed casing. bell-wringing mechanism mounted wholly within said casing. a removable cover for said casing having a hollow. split. ex ternally threaded post formed on. the exterior thereof. a. stem mounted in said post, a gong eecentrically mounted on said stem. and a nut secured over said post for clamping said stein in position.

2. An electric bell cmnprising a scaled casing, clectromagnetie hell-ringing mechanism including the hammer mounting an ranged within and entirely mounted on said casing, a removable cover plate for the easing removable without displacing any of the bell-ringing mechanism. said casing having a chamber formed on the exterior of the side wall adj listing screws tor the bellriu;1' ing mechanism extending through the side wall of the easing into said chamber. and a eover for said chamber whereby the bellringing mechanism may be adjusted from the exterior of the casing.

In witness whereof. I hare hereunto subscribed my name.

RE UBEN R. BENJ A MIN.

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