US2303434A - Electrical switch - Google Patents

Description

0. CHANDLER ETAL ELECTRICAL SWITCH Original Filed June 22, 1940 4 Sheets-Sheet 1 v" ZZrneg 1942. D. L. CHANDLER arm. 7 2,303,434

ELECTRICAL SWITCH Original Filed 'June 22, 1940 4 shqets-shet 2 D. L. CHANDLER ET AL ELECTRICAL SWITCH Original Filed June 22, 1940 4 Sheets-Sheet 3 Dec. 1, 1942 Dec. 1, 1942. D. L.. CHANDLER ETAL ELECTRICAL swrwca.

Original Filed June 22, 1940 4 Sheets-Sheet 4 k& 3 x

Wi'iMW Q r (In Patented Dec. 1, 1942 ELECTRICAL SWITCH Daniel L. Chandler, Salem, George W. Ewing, Peabody, and Frank H. Walker, Salem, Mass., assignors to Aresee Company 1110., Salem, Mass., a corporation of Massachusetts Original application June 22, 1940, Serial No.

Divided and this application January 2, 1941, Serial No. 372,936

4 Claims.

Our present invention relates to automobile Window-sash control mechanism and especially to reversible electrical switch mechanism, being a division of Ser. No. 341,838, filed June 22, 1940.

I-Ieretofore, it has been the practice, in automobile manufacture, to provide hand-operated mechanical means of a more-or-less automatic type in which the automobile window-sash is raised and lowered by means of a crank, lever, or other hand motivated mechanisms. In all such devices, it is necessary for the operator of the window-sash to perform a continuous sustained movement of the hand, arm, and body, in order to continue the movement of the Window-sash in either direction.

In the engineering field, it is well known and recognized that more and more, automatic control is fast superseding hand-operated mechanisms in which the operators hand performs a continuous sustained movement during the operation of the mechanism.

In the present day manufacture of automobiles, this full-automatic development of controlling devices is making itself evident in many improvements which contribute to the ease and comfort of the operator.

Such automatic development not only contributes to the convenience of the operator but at the same time increases the safety factor in the operation of the vehicle by relieving the operator from many minor physical duties heretofore necessary and thereby giving him more time in which to direct his attentions to road hazards requiring his full attention.

In our present invention, we have designed and developed new automatic control mechanism for tomobile window-sash which is not only very convenient for the operator of the motor vehicle but does not require any continuous sustained movement of his hand when it is desired to raise or drop the window-sash of the automobile.

Our present invention involving automatic control of the window-sash substitutes electricity for manual power in the sustained movement of the window-sash so that one initial movement of the operators finger sets in motion the movement of the window-sash, either up or down, and the release of pressure exerted by the operator, instantly stops the movement of the windowsash, in either direction. Furthermore, automatic mechanism is provided which makes it impossible for the operator to continue the direction of movement of the Window-sash in either direction beyond a certain point thereby making paratus, and at the same time making it unnecessary for the operator to keep his eye on the movement of the window-sash when his attention may be needed other places. In other Words, when the Window-sash reaches its maximum top or bottom movement, as the case may be, the movement is automatically checked and the operator cannot continue such movement further even though his attention may be centered elsewhere. To reverse the movement of I the window-sash, a reverse movement by the opit impossible for the operator to damage the aperator is necessary. This is a very important feature in any automatic apparatus of this type because the operator cannot always be watching the window-sash in its movement while he is driving in trafiic or at other times when his vision may have to be directed in front of him on the road, intersections, or oncoming vehicles, also it is important that such window movement ceases when the limit of travel is reached in order to prevent damage to the apparatus.

The principal object of our invention is an improved electrical switch;

Another object is an improved electrical switch combined with automobile window raising mechanism;

Still another object is an electrical switch combined with automobile window-sash operating mechanism which automatically reverses and stops the movement of the automobile windowsash in its up and down movement and returns the operating lever to a neutral position, and

Other objects and novel features comprising the construction and operation of our improved device will be apparent as the description of the same progresses.

In the drawings illustrating our invention,

Fig. l is a partial side elevation and cross-section of an automobile door to which our invention has been applied, the top and bottom of the door and the inner panel of the door being eliminated and removed for the purpose of convenience;

Fig. 2 is a fragmentary cross-section taken on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary cross-section taken on the line 33 of Fig. 1, the dot-and-dash lines indicating an emergency crank handle;

Fig. 4 is an enlarged side elevation, parts being broken off and others shown in cross-section for convenience, and showing the switch illustrated in Fig. 1;

Fig. 5 is an end elevation of the switch, as viewed from the left-hand side as illustrated in Fig. l;

Fig. 6 is back side elevation of the switch, as viewed in Fig. 1;

Fig. '7 is a side elevation of the switch shown in Fig. 4, parts of which are broken out for clarity, and showing the switch depressed downwardly, as would be the case when the operating lever, also shown in Fig. l, is pulled to the dot-and-dash positions;

Fig. 8 is a right-angle projection of Fig. '7, similar parts being broken away for clarity, and showing the various parts in their proper relation wit respect to Fig. 7;

Fig. 9 is an elevation of Fig. 8, similar parts being broken out for clarity, and showing certain parts raised just prior to final position after the operating lever has been raised;

Fig. 10 is a fragmentary plan view of the top portion of the switch, as shown in Fig. 9;

Fig. 11 is a cross-section taken on the line III| of Fig. 6;

Fig. 12 is a cross-section taken on the line I2|2 of Fig. 6 and particularly showing the base plate of the switch certain superimposed parts being removed;

Fig. 13 is a View similar to Fig. 12 but showing one of the slidable superimposed members in place, portions of which have been removed or broken out to better illustrate its relationship to the base plate shown in Fig. 12;

Fig. 14 is another view similar to Fig. 12. In this illustration portions are shown broken oif and the slide member shown in Fig. 13 has been removed. A second slide member has been mounted on the base plate by itself for the purpose of clearly defining the structure separate from that shown in Fig. 13. When both slide members and base plate are combined in proper engagement, in a neutral position, the assembly appears as shown in Fig. 5 with the exception of the mounting bracket which is attached separately to the switch member, as indicated in Fig. 12.

Referring more in detail to the drawings illustrating our invention, I indicates the side frames of an automobile door. In conventional automobile door design an inside panel I I is provided upon which the window-sash glass I3 is slidably mounted in the door frames If! so that the glass I3 and the channel sash member I2 in which the glass is mounted can be moved up and down.

A split window sill I4 is provided between the slide frames I3 and is positioned so that the glass I3 can be moved up and down between the sill members to any degree of height desired by the operator.

In Fig. 1 it will be noted that we have provided a frame member I having bolts I6, the bolts being shown in cross-section and normally adapted to be fastened in the panel II which is cut away. Pivoted in the frame member I5 at I! and I8 are lever arms l9 and 20. The lower ends of the arms I9 and 20 are provided with rollers which engage in the channel members 2| and 22 which are fixed to the bottom face of the glass channel member I 2. On the far side of the frame member I5 and attached to the lever arm I9 is a segmental gear 23. The lever arm 20 is engaged with the lever arm I9 through gears 24 and 25. A counter balance spring 26 is fixed to the pivot I8 and anchored at 2'! to a struck-up portion of the frame I5.

Assuming that the frame I5 is stationarily mounted to the door panel II and the gear seg- -ment 23 is rotated, it will be apparent that the arms I9 and 20 will swing in opposite directions about the pivots I! and I8 and raise or lower the member I2 and attached glass I3.

In conventional door design a shaft 28 is journalled in the frame I5 and is provided on the far side, as viewed in Fig. l, with a pinion 29 which is engaged with the teeth of the segment member 23, and on the near end of the shaft 23 a crank member is placed so that the operator can rotate the pinion 29 and gear 23 for the purpose of elevating or lowering the glass I3.

In our present invention it will be noted that we have eliminated the conventional crank and in place thereof we have mounted on the shaft 29 an additional gear 30 on the near side of the frame I5.

Also attached to the panel II in the lower portion of the door we have provided a motor generally indicated at 3|, the motor frame bolts 32 being shown in cross-section. The motor 3|, as shown in Fig. 1, is of the reversible type, the rotor 33 being directly connected to a vertical shaft 34 which is journalled at its upper end in a housing 35 which is also attached to the panel II, see Fig. 3. ttached to the rotor shaft 34 is a worm 35 which is directly engaged with the worm gear 30. It will thus be seen that when the motor 3| is energized in either direction the segment member 23 will be turned. Provision has been made, and will be described further along in our description, for automatically stopping the motor 3| at either end of the travel of the glass I3 and for reversing the direction of said motor.

In addition to providing a direct electrical motor drive to the segment member 23, we have also provided an emergency control apparatus so that should for any reason the electrical control fail to function, the glass may be operated by hand control.

Attached to the top end of the motor shaft 34 and located within the housing 35 is a bevel gear 31 engaging with another lever gear 38 which is journalled in the upper portion of the housing 35. It will be noted that the gear 35 is provided with a hub recess 39 preferably square in shape and an opening 40 is provided through the panel I I. In the event that the motor 3| should fail to operate from any cause, an emergency handle 4|, shown in dot-and-dash lines in Fig. 3, may be inserted in the gear recess 39 and the shaft 34, worm 35, and worm gear 30 rotated by hand thereby turning the segment gear 23 and raising or lowering the window glass I3. When the motor 3| is driving the apparatus the bevel gears 38 and 31 idle freely within the housing 35.

At 42 we have provided a pivot, also mounted on the cut away panel II, on which is provided the operating lever 43. In the upper side of the inner window sill member it will be noted that we have provided a slot 44 through which projects the upper end of the operating lever 43. The dot-and-dash positions of the top of the operating lever 43 indicate the position taken by the lever when the window glass I3 is being elevated or lowered, the full line position, as shown in Fig, 1 indicating the neutral position at which position the electrical motor 3| is out off from electrical current. The lower end of the operating lever 43 is provided with a right angle extension lever portion 45 which is directly engaged with the electrical switch, generally indicated at 45. The electrical switch 46 is also suspended from the panel II by means of a bracket 41 and connecting bolts 48, and a second- .ary bracket 49 and the connecting bolts 50.

The switch 46, indicated in Fig. 1, is in a more or less diagrammatic form, and is more fully shown in detail in Figs. 4 to 14 inclusive. This switch is provided for the control of the motor 3i and is actuated in part by means of the control lever 43.

Prior to describing the switch in detail we first wish to set forth the functions performed by the mechanism comprising the switch in a general way so that it will be apparent just what duties are required from it in operation.

As previously mentioned, provision has been made to eliminate any possibility of the motor 3| continuing to operate after the limit of movement of the glass l3 has been reached therefore the switch in combination with other apparatus shown in Figs. 1 and 2 automatically opens the electrical circuit when the window glass I3 reaches its either extreme movement. This function takes place without any attention from the operator, in fact, if the operator holds the operating lever in either position too long without releasing it no damage occurs as the lever 43 is automatically returned to the neutral position at which point the electrical circuit to the motor is opened. The glass l3 may be stopped at any position by releasing the lever 43, the switch mechanism automatically returning it to its neutral position and thereby opening the electrical circuit. When the window glass i3 is in its upermost position, for instance, the operator cannot throw it into any other than a reverse position which will lower the window. When the lever is in a reverse position, as when the window is fully lowered, the operator cannot throw the lever into any other than the position which raises the window glass l3.

The switch 46 is composed of two parts mounted together, One part comprises a double pole double throw electrical switch which carries the electrical current, and the second part of the said switch comprises the automatic mechanism which controls and operates the double pole double throw switch. In Figs. 4 and 6 opposite sides of the double throw switch are shown in its neutral position, in 5|, 52, and 53 indicate the insulated frame, the center lever 54 being a parallel knife blade insulated at the free end 55 and pivoted at 56 and 51 to contact brackets. The free end of the blades 54 engage with the upper contact members 58 and 59 and lower contact members 66 and 6|, see Fig. 7, which shows reversed positions of the blade 54.

In Fig. 12, we have provided a base plate member 62 which is fixed to the ends of the insulated frames 5| and 53 by means of the screws 63. This base plate 62 forms the base upon which is mounted the other parts making up the automatic elements of the mechanism which operates the knife members 54. It will be noted that attached to the insulated member 55 is an extension lever 64 which projects up through the slot 65 provided in the base plate 62. This extension lever member 65 projects above the top face of the base plate 62 and is engaged by other mechanism, as will be explained further along in the description.

Pawls 66 and 6'! are pivoted to the base plate 62 under screws 68 and 69. Also pawl springs 16 and H are pivoted to the base plate 52 and 12 and 13 respectively. Pawl spring pins and 15 are provided on pawls 66 and 61 respectively against which bear the springs 10 and H. The pawls normally tend to swing to the left due to the springs 10 and H.

In Fig. 13 we have shown the addition of a switch slide member 14 which actuates the switch extension lever 64, This switch slide member 14 is provided with elongated slots 16 and I6 and is held in place on the base plate 62 by means of the screws 11 and 18. At each end of the extension switch slide member 14 are provided end members 19 and 86 which are positioned at ninety degrees to the top face of the said slide and forming end brackets through which is mounted a rod 8! over which the switch slide equalizing springs 82 and 83 are mounted. On the right-hand side of the switch slide member 14 are provided stepped stop members which are adapted to engage with the free end of the pawls 66 and 61. These stepped stop portions of the switch slide member 14 are indicated at 84, 85, 86, and 81 and 88. Surrounding the three sides of the extension switch member 64 is a recess 89 which is provided in the left handside of the said slide member 14 and which controls the movement of the said extension switch member 64.

In the position of the switch slide member 14, shown in Fig, 13, it will be noted that when the switch slide member 14 is moved on the plate 62 in an upwardly direction from the position shown in Fig. 13, the extension switch lever member 64 will be swung upwardly, as shown in dot-and-dash: lines in Fig. 7 thereby causing the knife blade members to engage with the contact members 55: and 58. When this action takes place the motor rotor 33 is caused to rotate in a counterclockwise direction rotating the segment gear in a clockwise direction and consequently raising the window glass [3. At such time the operating lever 43 is pushed to the left-hand side, as shown in dotted lines in Fig. 1. When the switch slide member 14 is moved downwardly, as viewed from Fig. 13, the reverse movement of the motor rotor 33 takes place and the window glass I3 moves downwardly. At such time, the operating lever 43 is pulled to the right, as viewed in Fig. 1, into the dot-and-dash position indicated,

In Fig. 14 we have shown a second slide member 96 which is also mounted on the base plate 62, on the left-hand side of the switch slide member 14. In Fig. 14 the switch slide member 14 has been removed for the purpose of clarity and to prevent confusion with the slide 96. The slide 90, hereinafter referred to, as the actuating slide member, is directly connected to the extension lever 45 of the operating lever 43, the end of the extension lever 45 operating through the slot 9| at the top of the actuating slide member 90.

The actuating slide member 66 is also slidably mounted on the base plate 62 in a similar manner to the switch slide member 14. In the case of the actuating slide member, the screws 52 and 93 are fixed in the plate 62 and guide the actuating slide member in the slots 94 and 95 provided for the purpose.

Attached to the top surface of the actuating slide member 95 is a cam plate 96 which is attached to the actuating slide member by means of screws SI. The cam plate 96 is provided with a central recess 98 and a communicating slot extending all the way out to the left-hand side of the said cam plate 96 and the actuating slide memberilil, as indicated at 99, in Fig. 14. In actual practice this communicating slot 99 engages the sides of a right-angled bracket member Hill which is solidly attached to the face of the actuating slide member 90. The cam plate 96 is provided with cam edges WI and I02 which are adapted to engage the pawl pins I5 and I5 respectively. A central cam edge I 03 also engages the pawl pins 75 and "I5 at the extreme point of movement of the actuating slide member 90 in either an upwardly or downwardly direction.

At each end of the actuating slide member 90 are provided right angled bracket portions I04 and I95 solidly connected to the actuating slide member. These brackets I04 and I05 are provided with openings indicated at I06 and I01, better illustrated in Fig. 10. The openings I06 and I? are slotted on opposite sides, as shown in Fig. 10, and as indicated at I08, for the purpose of admitting the key portion I09, see Figs. 7 and 10 of the studs H9 and III which are mounted on the bracket 41 and switch frame 53 respectively. It will be noted, by an observation of Fig. 7. that the key portion I99 formed on the studs H6 and III can pass through the slotted opening I06 in the brackets I04 and I formed on the actuating slide 99 freely in either an upwardly or downwardly position without interference. Located between the key portions I09 and the base of the studs I I3 and I I l are compression equalizing springs I I2 and H3. The key members I59 limit the upward movement or outward movement of the springs H2 and II3, as shown in Fig. 7, but when the brackets I04 and I05 are depressed over the studs 5 II} and I I I, the springs H2 and II3 act in compression tending to react against such movement. b

Referring back to Fig. 1, it will be noted that we have provided on the under side of the near portion of the window sill I4, a bracket member I I4 through which is slidably mounted a slidable rod II5. The rod H5 is provided at its top end with a cap member H6 which limits its downward movement in the bracket member H4. The bottom end of the rod I I5 extends downwardly passing through the bracket portion I94 of the actuating slide member 90 and terminating thereunder in a cap or stop member H6. Cushion springs III and H8 may b provided if desired.

Attached to the channel member I2 carrying the window glass 13 is a bracket member II9 through which theh rod H5 passes and which is located above the cushion spring M9 and below the cushion spring II I.

Referring back to Fig. 9, it will be seen that the switch slide rod Si is provided in its central portion with a. key member I2!) slidably journalled through a slotted opening in the bracket member I56 of the actuating slide member 90. This key portion 520 of the rod 8! is similar in all respects to the key portion I59 and the studs H5 and III previously described excepting that a washer I2I is provided under the ends of the switch slide equalizing springs 82 and 83 and against the key portions I20 when the key portions are compressed against the springs 82 and 83, as illustrated in Fig. 9.

In operation, assuming that it is desired to raise the window glass I3 from the lowermost position shown in Fig. l, the operating lever 43 is pushed to the left and the glass I3 raises, and a push to the right on the lever 43 lowers the glass. In the illustrated position shown in Fig. l, the glass is at rest because the lever 43 is in a neutral position. In Figs. 4, 5, and 6, the apparatus is illustrated in the neutral position. This neutral position respresents any position or the termination of any action after the operators hand has been removed from the operating lever 43.

the extreme movement of the glass I3 either up or down.

In Figs. 7 to 10 inclusive, we have illustrated various positions of the apparatus after the lever 43 has been pulled to the right-hand side, as viewed in Fig. 1. Fig. '7 shows the position of switch blades 54 contacting electrical contacts 60 and 6|. In this position, the motor 3I is energized and the window glass I3 moves upwardly and will continue to move up until the operator releases the lever 43, or the bracket I I9 attached to the glass channel member engages the fixed collar I22 mounted on the rod II5. When the bracket II9 reaches the collar I22 the limit of movement of the glass I3 has been reached in an upwardly direction and if the lever is still held over to the right side the rod H5 will lift bring- It also represents any position comprising ing the lower capped end up under the actuating slide bracket I04 and allowing the switch blades 54 to return to a neutral position at which point all electrical current is cut ofi from the motor 3I.

In similar operation, assuming that the window glass I3 is moving downwardly, the operating lever 43 is then thrown to the left-hand side, and if the operator continues to hold it when the glass is fully down the bracket II9 compresses the spring H3 until the actuating slide bracket I 04 is depressed and the switch blades 54 are moved from the dot-and-dash lines shown in Fig. 7 to the center neutral position at which point all electrical current is disconnected from the motor 3|.

When the automatic cut-out of the electrical circuit takes place the operator is instantly reminded because the lever 43 is pulled from his grasp into the neutral position.

Assuming that the operator wishes to move the glass I3 part Way up and stop it at that point, the action is as follows: The lever 43 is pushed to the right-hand side and the actuating slide member 90 is depressed downwardly compressing the heavy equalizing spring II2 on the stud III] and at the same time the bracket I03 slides down on the rod 8I compressing the switch slide equalizing spring 83. When this action takes place, the cam plate 95 becomes engaged on the cam surface I03 with the pawl pin '15 which raises the pawl 51 from th step 85. When the pawl 61 is raised from the surface on the switch slide member I4, the compressed switch slide equalizing spring 83 snaps the slide I4 down into the position shown in Figs. 7 and 8. The downward movement of the switch slide 14 is stopped by the pawl 6'? when it engages the side of the step 88 on the slide. At this point it will be noted that the switch blade extension lever 64 has been acted upon by the recess 89 in the left-hand side of the switch slide member I4 causing the switch blades 54 to engage the electrical contacts 60 and SI. While the operating lever 43 is held to the righthand side the actuating slide 99 will hold the above described mechanism in place and th window glass I3 will continue to move upwardly, and at this point the pawl 56 on the upper side will be engaged against the step 84 of the switch slide 14.

If during the upward movement of the glass I3 the operator releases the lever 43 the following movements will take place: The equalizing spring I I2 on stud I I0 immediately pushes the actuating slide 90 up to the position shown in Figs. 4, 5 and 6. At Fig. 9 we have stopped the movement of the actuating slide 90 just before it reaches its neutral position to better illustrate the next movement of the various parts affected.

It will be noted in Fig. 9 that although the actuating slide 90 has moved up from the position shown in Fig. 9, yet the switch slide 14 still remains in its lowermost position being held there by means of the pawl 66 engaged against the end of the slide step 84. In Fig. 9, the cam plate surface lfll is in the act of lifting the pawl pin 15 from the end of the step 84. At this point, it will be noted that the actuating slide central bracket N is now compressing the upper switch slide equalizing spring 82 while the collar is engaged against the key portion I20 of the rod 8! and. the spring 85 is in a neutral position. As the movement of the actuating slide member 90 continues and finally releases the pawl 66, the switch slide equalizing spring 82 snaps the switch slide 14 upwardly carrying the knife blade extension lever 64 into a neutral position thereby opening the electrical circuit to the motor 3|. The up ward movement of the switch slide 14 is limited by the pawl 66 which now engages against the end of the switch slide step 88. At this point, the apparatus is back in a neutral position shown in Figs. 4, 5 and 6.

Should the operator now wish to reverse the action, the operating lever 43 is pushed to the left-hand position and the actuating slide 99 moves upwardly bringing the bracket I05 into compression against the equalizing spring I I3 on the stud III. In this position the operation is repeated in reverse causing the switch slide 14 to throw the switch blade extension lever 64 up against and into the dot-and-dash position indicated in Fig. 7.

It will be noted throughout the above description that no movement of the knife blade 54 takes place until certain of the mechanism reaches a predetermined position at which time the movement of the switch is very quick thereby reducing any tendency for arcing or fluctuations in the movement of the motor 3|, and at the same time all positions of the switching mechanism are locked in place.

Throughout our invention, as disclosed in Figs. 1 to 14 inclusive, we have used a reversable electrical motor in combination with an automatic reversing switch mechanism and stop members associated with the window glass channel member l2. This mechanism is controlled by means of an operating lever 43 which protrudes through the window sill l4.

Having thus described our invention what we claim as new is:

l. A reversing mechanism for double throw electrical switches comprising in combination, a base plate attached to the frame of an electrical switch, an actuating slide member mounted on said plate, equalizing springs contacting with a bracket portion of said actuating slide member and said switch frame, a switch extension lever extending through said base plate, a switch slide mounted on said base plate, a recess located in said switch slide engaging said extension switch lever, stepped stop members located on said switch slide member, equalizing spring members attached to said switch slide member, a centrally located bracket member located on said actuating slide and engaged between the opposed ends of the equalizing springs attached to said switch slide, pawls pivoted on said base plate and pawl springs engaging said pawls and said base plate, a cam plate located on said actuating slide, pawl pins located on said pawls, said cam engaging said pawl pins for the purpose of raising said pawls from said stepped stop members on said switch slide member.

2. A reversing mechanism for double throw electrical switches comprising in combination, a base plate attached to the frame of an electrical switch, an actuating slide member mounted on said plate, springs contacting with a bracket por-, tion of said actuating slide member and said switch frame, a switch extension lever extending through said base plate, a switch slide mounted on said base plate, a recess located in said switch slide engaging said extension switch lever, stepped stop members located on said switch slide member, equalizing spring members attached to said switch slide member, a centrally located bracket member located on said actuating slide and enaged between the opposed ends of the equalizing springs attached to said switch slide, pawls pivoted on said base plate, a cam plate located on said actuating slide, pawl pins located on said pawls, said cam engaging said pawl pins for the purpose of raising said pawls from said stepped stop members on said switch slide member.

3. A reversing mechanism for double throw electrical switches comprising in combination, a base plate attached to the frame of an electrical switch, an actuating slide member mounted on said plate, equalizing springs contacting with a bracket portion of said actuating'slide member and said switch frame, a switch extension lever extending through said base plate, a switch slide mounted on said base plate, a recess located in said switch slide engaging said extension switch lever, stepped members located on said switch slide member, spring members attached to said switch slide member, a centrally located bracket member located on said actuating slide and engaged between the opposed ends of the said springs attached to said switch slide, pawls pivoted on said base plate and pawl springs engaging said pawls and said base plate, a cam plate located on said actuating slide, pawl pins located on said pawls, said cam engaging said pawl pins for the purpose of raising said pawls from said stepped stop members on said switch slide member.

4. A reversing mechanism for double throw electrical switches comprising in combination, a base plate attached to the frame of an electrical switch, an actuating slide member mounted on said plate, spring members contacting with a bracket portion of said actuating slide member and said switch frame, a switch extension lever extending through said base plate, a switch slide mounted on said base plate, a recess located in said switch slide engaging said extension switch lever, stepped stop members located on said switch slide member, spring members attached to said switch slide member, a centrally located bracket member located on said actuating slide and engaged between the opposed ends of the said springs attached to said switch slide, pawls pivoted on said base plate and pawl springs engaging said pawls and said base plate, a cam plate located on said actuating slide, pawl pins located on said pawls, said cam engaging said pawl pins for the purpose of raising said pawls from said stepped stop members on said switch slide member.

DANIEL L. CHANDLER. GEORGE W. EWING. FRANK H. WALKER.

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