US1540377A - Pull-switch socket - Google Patents

Description

June 2,

C. E. WARNER PULL SWITQH SOCKET Filed April 25, 1921 2 Sheets-Sheet 2 Patented June 2, 1925. g I 1 UNITED STATES PATENT DFFICE.

MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS- PULL-SWITCH SOCKET. I

Application filed April as, 1921. Serial No. 464,229.

7'0 all whom. it may com-em: Fig. 6 is a section on the line 6-6 of Be it known that I, CHESTER E. WARNER, Fig. 3; a

a citizen of the United States, residing at Fig. 7 is a section on the line 7-7 of .Berwyn, in the county of Cook and State Fig. 3,-

of Illinois, have invented new and useful Fig. 8 is a section on the line 88 of Improvements in Pull-Switch Sockets, of Fig. 3;

which the following is a full, clear, concise, Fig. 9 is a disassembled perspective view and exact description, reference being had of the switch parts;

to the accompanying drawing, forming a Fig. 10. is a side view showing the mount- 10 part of this specification. ing for the switch arm; and

My invention relates to circuit controlling Fig. 11 is a section on the line-1111 of devices, and particularly to pull switch Fig. 10. sockets, and switch mechanisms for such Referring now in detail to the drawings, sockets. the pull switch socket shown therein com- 15 One of the objects of my invention is toprises a threaded shell contact 11, a center provide an improved pull switch. socket hav contact 12, a wiring terminal 13 for the ing a switch mechanism, which is capable shell contact 11, a wiring terminal 14 for of handling currents of large wattage. the center contact 12, a switch mechanism Such sockets are now called upon to carry 15 for controlling the circuit between the current for electric fiat irons, vacuum cleancenter contact 12 and the wiring terminal ers. and other devices taking .more current 14, two spaced insulating basemembers 16 than the sockets commonly in use are caand 17, for supporting the contact, wiring pable of handling, and in View of the limitterminals and switch mechanism, an insulated space available in the ordinary socket, ing lining 18 of sheet material for enclosproduce a pull switch mechanism which wiring terminals and switch mechanism and could be safely employed in a socket of the a sheet metal casing 19, forming an outside present type. This is accomplished in the casing for theinterior socket construction. socket and switch mechanism forming the The threaded shell contact 11 is always 30 subject matter of the present invention. electrically connected with the wiring ter- Another object of my invention is to prominal 13 by means of a screw 20 (Fig.7) ride a heavy duty pull switch socket interior which extends through registering openings of substantially the same size as the present in the flange 21 of the threaded shell constandard interiors, and which may be intact and the lower insulating base 16 and is serted in the standard light duty pull switch threaded into the binding plate of the wirsocket casing without'change in either the ing terminal 13. casing, lining or cap. The switch mechanism 15 controls the cir- A further object of my invention is to procuit between two stationary spring contact vide a pull switch socket which will be dumembers 21 and 22. The/contact member 40 rable and efl'icient in use, simple in construc- 21 is always electrically connected with the tion and cheap to manufacture. center contact -12, by means of a tubular Further objects will appear from the demetal eyelet 23 (Figs. 1, 5 and 8). The tailed description to follow and from the other spring contact is always electrically appended claims. connected with the wiring terminal 14, the In the drawings in which an embodiment base 24 of the contact member being held of my invention is shown underneath the binding plate 25 of the wir- Fig. 1 is a vertical axial section through ing terminal 14 as shown in Fig. 8 by a pull switch socket; means ofa screw 26 extending through" reg- Fig. 2 is a top plan view of the socket istering openings in the insulating base 16 511 shown in Fig. 1 with the cap removed; and the contact 22 and threaded into the Fig. 3 is a section on the line 33 of binding plate 25. One of the spring con- Fig. 4; tacts 21 is thus always electrically connected Fig. 4 is a section on the line 4-4 of with the center contact 12, and the other Fig. 2; spring contact 22 is always electrically con- 55 Fig. 5 is a bottom plan View of the socket; nected with the wiring terminal 14. The

- it has been a matter of great difliculty to ing the bases 16 and 17, and the contacts,

' movement,

transversely extending pivot portion switchmechanism controls the. circuit between the two contact fingers 21 and 22 and by making or breaking the connection therebetween makes or breaks the circuit between the wiring terminal 14 and the center contact 12. V

The switch mechanism for controlling the circuit, comprises in addition to the spring contact fingers 21 and 22, a pivoted oscillatable switch blade 27 (Figs. 4 and 10) a pair of contact members 28 and 29 carried y the switch arm 27 for engaging the spring contacts 21 and 22 respectively, a rivet 29 for securing the contact members 28 and 29 to the insulating switch arm 27 and electrically connecting the contact members 27 and 28, a double S-shaped bent wire spring 30, (Figs. 4 and 9) bearing on the. switch blade 27 and shift-able back and forth past a dead center to cause oscillation of the switch blade 27, a U-shaped connecting link 31 (Figs. 7 and 9) pivotally connected at 32 (Fig. 4) to the S-shaped spring 30, and having its other end guided for sliding as hereinafter described, a combined crank-shaft and pivot pin member 32 pivotally 31 for driving it, a driven ratchet member 33 secured to drive the crank-shaft 32, a combined lever and driving ratchet member 34 oscillatably mounted on the member 32 for driving the ratchet member 33, a pull chain 35 secured to the lever member 34, a pivot pin 36 on which the switch blade 27 is oscillatably mounted, and a sheet metal switch frame 37 for supporting the pivot pin 36, and the crank-shaft and pivot pin member 32, and other parts of the switch mechanism. The switch frame 37 is secured to the insulating base 16 by means of a screw 38 extending through an opening in the insulating base 16, and threaded into the switch frame (Fig. 6).

The construction is such, that each successive pull on the pull chain 35 moves the crank-shaft 32 through a. movement of 180 degrees and moves the switch arm 27 alternately up and down to make and break the circuit between the spring contacts 21 and The S-shaped bent wire spring 30 straddles the insulating switch arm 27, and has a 39 for engaging a pivot notch 40 in the switch arm 27. The ends of the bent wire spring 30 are bent outwardly to provide pivot portions 41, which extend into openings 42 in the side arms of the U-shaped connecting link 31 to pivotally connect the link 31 with the bent wire spring 30.

The upper end of the U-shaped connecting link 31 is provided with a pair of openings' 43 through which the crank pin por- 1310121 44 of the crank-shaft member 32 exten s.

connected with the connecting link The driven ratchet member 32' may he a die casting comprising a disc portion 44. having openings 45 therein for cooperation with the ratchet teeth 46 on the driving ratchet member 34, and having a laterally extending boss 27 having a notch 48 therein to receive the offset portion 49 of the crank pin 32, and prevent relative rotation be.- tween the ratchet member 33 and the crankshaft 32. Thus, as the ratchet member 33 is driven it carries with it the crank-shaft 32, and causes the crank-shaft 32 to actuate the switch blade 27 through the connecting link 31 and S-shaped spring 30.

The lower'end of the connecting link 32 is guided in its movement by bearing on the pivot pin 36, on which the switch arm 27 is pivotally mounted as shown in Fig. 4. The S-shaped spring and the U-shaped connecting link both straddle the switch arm 27, thus forming a compact and balanced construction.

The combined driving ratchet member and switch lever 34 is provided with a chain rail portion 47 for receiving the pull chain 35, the pull chain being held in place between this chain rail portion and the disc portion 44 of the driven ratchet member 33. The end of the chain is secured to the member 44 by means of a bifurcated hook 48 (Fig. 9) which receives one of the balls of thechain 35.

For returning the switch lever 34 after it has been operated by the pull chain 35 and for holding the ratchet teeth 46 over against the driven. ratchet member 33, a coil torsion and compression spring 49 is provided, one end of which is secured underneath a lug 50 on the switch lever 34, and the other end of which is secured to the switch frame 37. The sprin 49 is under compression so that it ten s to force the ratchet teeth 46 against the driven ratchet member 33 to cause the ratchet teeth to enter the ratchet openings 45.

The switch frame 37 has two upright bearing- standard portions 51 and 52, the bearing-standard 51 having a bearing opening therein for the end of the crank-shaft 32, and the bearing-standard 52 having an opening therein forming a bearing for the cylindrical boss 47 on the driven ratchet member 33 (Fig. 7

As stated above, each pull upon the chain 35 moves the driven ratchet. member 233 degrees, and also causes the crank pin 32 to move 180 degrees. This movement of the crank pin 32 through 180 degrees moves the connecting link 31 alternately up and down.

As stated above, the connecting link 31. has a sliding engagement with the pivot pin 36 on which the switch blade 27 is mounted. This connecting link 31 as it moves alternately up and down shifts the tion 53 (Fig. 6) which till indicated in Fig.

pivotal point of connection between the connecting link 31 and the spring past the dead center line between the pivot portion 39 of the spring and the pin 36 of the switch blade 27 to cause a snap movement of the switch blade 27.

For limiting the return movement of the switch lever 34 under the action of the spring 49, the switch frame 37 is provided with an upwardly extending stop piojecis engaged by the hook member 48 to stop the return movement of the switch lever. The U-shaped connecting link 31, the switch frame 37, and

the ratchet member 34 may be sheet metal stampings.

In order to provide for freedom of movement and ease of assembly of the switch arm 27 with respect to the pivot pin 36, the switch arm is provided with an enlarged opening 54, which is large enough so that the retaining flange of the pivot pin 36 can be inserted through this opening. When the switch arm 27 is in position on the pivot pin 36, it is held in place between the two retaining flanges 55 and 56, the S-shaped spring 30 serving to hold the edge of the opening 54 against that part of the pivot pin 36 which lies between the retaining flanges, as shown in Figs. 10 and 11. This mounting of the switch arm 27 gives a sort of rocking or rolling motion of the switch arm 27 on the pivot pin 36, thus providing an anti-friction bearing. It, also provides for easy assembly of the switch arm 27 with respect to the pivot pin 36, as all that is necessary to do is to 27 over the pivot pin into position between the retaining flanges where it is held by the S-shaped spring 30.

The chain 35 is guided by means of a tubular chain guide or horn 57, which is secured to a sheet metal bracket 58, having hook portions 59 which engage correspondingly shaped retaining members 60 formed on the lJ-shaped sheet metal bracket 61 mounted between the insulating bases 16 and 17 (Fig. 4). The bracket 58 which carries the horn is prevented from coming unhookcd by its engagement with the casing 19.

I have so designed the construction that the switch mechanism forms a cooperative combination with a considerable portion of the standard light duty pull switch socket casing and associated parts, so that the construction can be inserted-in the standard light duty pull switch socket'casing with out changing the casing, lining or cap. As 4, the lower insulating base 16 forms a stop for the movement of the switch arm in one direction, and the upper insulating member 17 forms a stop for the movement of the switch arm in the opposite direction.

and shiftable back slip the switch arm' Having thus described'my invention, what claim as new and desire to secure by Letters Patent of the United States is:

1. A switch mechanism comprising a pivoted switch blade, oscillatable back and forth, a spring bearing on said switch blade, and shiftable back and forth past a dead center to cause oscillation of said switch blade, and means for shifting said spring comprising a link having one end connected with said spring, a crank-shaft having a crank portion connected to the other end of said link, a driven ratchet member for driving said crankshaft, and a driving ratchet member for driving said driven ratchet member, said driven ratchet member comprising a flange portion for engagement with said driving ratchet member, and a boss portion integral with said flange portion for engagement with the crankshaft, said driven ratchet member having an opening therein through which the crank-shaft extends, said boss having a notch therein, said crank-shaft having an offset portion forming the crank, lying in said notch to prevent relative rotation between said driven ratchet member and crank-shaft.

2. A switch mechanism comprising a pivoted switch blade, oscillatable back and forth, a spring bearing on said switch blade and forth past a dead center to cause oscillation of said switch blade, and means for shifting said spring comprising a link having one end connected with said spring, a crank-shaft having a crank portion connected to the other end of said link, a driven ratchet member for driving said crank-shaft, and a driving ratchet member for driving said driven ratchet member, said driven ratchet member comprising a flange portion for engagement with said driving ratchet member, and a boss portion integral with said flange portion for engagement with the crank-shaft, said driven ratchet member having an opening through which. said crank-shaft extends, said boss having a notch therein, said crank-shaft having an offset portion forming the crank lying in said notch to prevent relative rotation between said ratchet member and crank-shaft, anda bearing bracket having an opening therein in which said boss is rotatably mounted.

3. A switch mechanism comprising a pivoted switch blade, oscillatable back and forth, a shaft on which said blade is oscillatably mounted, a spring bearing on said switch blade and shift-able back and forth past a dead center to cause oscillation of said switch blade, and means for said spring, said switch blade having an opening therethrough materially greater in diameter than the diameter of the shaft on which it is mounted, through which said shaft extends, said spring holding said blade shifting so that the edge of said opening bears on said shaft whereby said shaft is eccentric with respect to said opening, and whereby said switch blade is rockably mounted on said shaft.

4. A switch mechanism comprising a pivoted switch blade, oscillatable back and forth, a shaft on which said blade is oscillatably mounted, a spring bearing on said switch blade and shiftable back and forth past a'dead center to cause, oscillation of said switch blade, and means for shifting said spring, said shaft having spaced flanges thereon, said switch blade having an opening therethrough materially greater in diameter than the diameter of the shaft on which it is mounted, and at least as great in diameter as the diameter of one of said flanges, whereby said blade can be sli over one of said flan es in place said flanges, said sha t extending through said opening, said arm being mounted between saidflanges, said spring holding said blade so that the edge of said opening bears on said shaft, whereby said opening is coiped on tween centric with respect to said flange.

In witness whereof, I have hereunto subscribed my name.

CHESTER E. WARNER.

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