US1252492A - Entrance-switch. - Google Patents

Description

C D. FLATT.

ENTRANCE swncu.

APFLHATION FILED MAR. 3,1917.

1. 252,492, Patented Jan. 8, 1918.

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C. D. PLATT.

ENTRANCE SWITCH.

APPLICATION FILED MAR.3|191I.

1 ,252,492. Patented Jan. 8, 1918.

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Specification of Letters Patent.

Patented Jan. 8 1918.

Application filed March 3, 1917. Serial na sazse.

To all whom it may concern:

Be it known that I, CLARENCE D. PLa'r'r,

I a citizen of the United States of America,

residing at Bridgeport, Connecticut, have invented a new and useful Entrance-Switch, of which the following is a specification.

My invention relates particularly to an inclosed type of switcl The main object is to provide a simple, inexpensive but reliable construction which can be operated under normal; circumstances either with the box open or closed, but which can be locked in the open circuit position. Another object is to provide such a construction with means for automatic opening of the circuit when the box is opened. An-

to provide for the automatic opening of the circuit when the box is closed.

rovide a construction, the parts of which can be very readily assembled.

I In its preferred form the invention is illustrated in the accompanying two sheets of drawings in which- Figure 1, is a front view of the construction of my invention, the box being shown closed and locked with the parts in the open circuit position. This also shows a meter attached.

Fig. 2, is a side view of the construction embodying my invention. 'The switch handlev is shown in full lines in the open circuit position and in dotted lines in the closed circuit position. v

Fig. 3, is a side view showing the operating handle in the closed circuit position and the box open.

Fig. 4, is a front view on a larger scale showing the switch in the open circuit position and the box open.

' 11 and 12 are suitably secured to the base.

Fig. 5, is a vertical section on the plane of the line 5-5, of Fig. 4:. Fig. 6, is a perspective view of the movable switch member, part being broken away.

Fig. 7 is a detail sectional view showlng the movable switch member and stationary contacts in the closed circuit position.

The insulating base 10 carries all the conducting parts of the switch except the movable switch member. Stationary contacts and provided with binding screws 11 and 12' respectively. The other stationary'com.

tacts 13 and 14 are secured to the base by the screws 15 and 16wh1ch to provide for a quick. greak of the circuit. Another object is to the'top of the cross bar members 29 and 30 down constitute the center contacts for the usual fuse plugs. The screw sockets 17 and 18 for the fuse plugs are electrically connected to the members 19 and 20 which are provided with blnding screws 19 and 21. The stationary contacts of the switch are preferably mounted in recesses such as 22 and 23.' The insulating base is preferably mounted in a box consisting of the body portion 25 and cover 26 hinged thereto. The base'may be secured to the bottom of the box by means for instance of screws such as 27.

The movable switch member consists of an insulating cross bar 28 carrying the laminated arch- shaped contacts 29 and 30.. U- shaped springs 31 and 32 hav'e their front ends inserted in the ends of the crossbar 28 and their rear arms pressing against the front face of the back of the box. Lugs such as 33 may be employed to assist in preventing outward movement of these springs. The sides of'the insulating base serve to prevent movement of the springs toward each other. The operating handle 34 is provided with a shaft 35 which extends through the sides of the box and is provided with an off-set crank portion 36. The springs 31 and 32 press the cross bar outward so that it presses against the shaft and its off-set portion 36. In'the open circuit position the tension of the springs holds the shaft in sucha position that the handle 34: presses against the stop 37. a The switch is closed by moving the handle from full line position in Fig. 2 to the dotted line position, that is, by pulling the handle downward. This action rotates the shaft 35 and the oif-set36' presses against 28 and forces the two movable switch into contact respectively with the contact plates 11, 13 and 12, I l as shown in Fig. 7. In coming to this position the handle strikes against the shoulder 38 carried by the cover 26 which is hinged to the box 25. The tension of the springs 31, 32 holds the handle in this position when the cover is closed. A plate 40 may be provided on the upper surface of' the cross bar 28 to take up the wear due to the friction of the operating the switch.

. Preferably there is an insulating barrier sitely movable switch members and 30.

off-set 36 in The lower insulating member 43 serves to prevent the movable switch member from falling downward when the parts are being assembled and the insulating shoulders 44 and 45 serve as stops to limit the upward movement of the cross bar 28. ,The handle and shaft are held'in place by the cotter pin 46. By removing this cotter pin the handle and shaft may be readily withdrawn.

This releases the movable switch member which may be taken out without the use of any ,tools. The parts are of course assembled in reverse order. When the shaft is inserted and the handle is operated to close the switch, the movement of the off-set 36 is suflicient to force the cross bar and the movable switch contacts into their proper places.

The switch. may be locked when in the open circuit position by meansof a padlock '47 whose hasp passes around the handle and through the flange 48. The handle may also be secured in the open circuit position by means of a seal and wire 49 passing through the opening 50 in the flange 48 and through the opening 51 in the cover.

When the circuit is closed and the switch handle in the dotted position of Fig. 2, the opening of the cover 26 and the movement with it of the shoulder 38 forces the switch handle upwardly to such a point that. the off-set 36 is aflected by the springs 31 and 32 so as to throw the switch open with a snap; action.

\Vhen the box is open of course the switch may be operated'by hand but if by accident the switch is left closed when the cover'is open, the closing of the cover from the posi- 1 the conduit 54 and being connected to the lower switch contacts.

The ,upper switch contacts are conveniently connected to the meter through the'bushing 55 and the wires from the meter lead back into the box' through the bushing 56 and then out through conduit 57. This prevents tampering with switch contacts insulating cross bar, arch shaped switch con ta-cts'carried by said cross bar, said base having insulating pro ections on the face thereof forming guides for said cross bar, springs for pressing said cross bar away from said base, an operating shaft having an ofiset engaging said cross bar and stops for limiting the movement of said operating shaft.

. 2'. In a switch construction, stationaryand movable switch members, a box inclosing the same comprising a body and a hinged cover, a shaft for operating the movsulating portions, stationary switch contacts mounted on opposite sides of said upper and lower insulating portlons, an insulatlng cross bar movable between the upper and lower insulating portions, switch contacts carried by said movable member at opposite sides of said upper and lower insulating portions for coacting with the stationary switch contacts, spring means for pressing said insulating member away-from said base and hand operated means for pressing said member and the contacts carried thereby toward said base. I

4. In a switch construction, thecombination of a box having forwardly projecting guides, an insulating base located between said guides but spaced apart therefrom, stationary contacts carried by said base, movable contacts, an insulating cross bar carrying said movable contacts, U-shaped spring arms connected to said cross bar and held in position between said base and. said guides, and means for operating said cross bar and the switch contacts carried thereby.

5. In a switch construction, the combination of-an insulating base, stationary contacts carried thereby, spaced insulating projections on, the insulating base at opposite sides of the cross bar for guiding saidcross bar with relation to said base, movable switch contacts carried by said cross bar, an

operating shaft having an offset portion for operating said cross bar in one direction and springs for operating said cross bar in the opposite direction.

6. In a switch construction, stationary and movable switch members, abox for inclosing the same comprising a body and a hinged cover, an operating shaft extending through said box and having a handle outside of said box, a shoulder carried by the cover in position to move the operating han dle from the closed circuit position toward the open circuit position when the cover is being opened with the switch closed, and a flange carried bvthe cover'in a position to engage the handle when the cover is open for the purpose of moving the handle from v crossbar andeach having one end connected 7 the closed circuit position toward the open circuit position. j

7. In a switch of the character set forth,

.an insulating base having spaced projections on the face thereof forming a guide channel, a cross bar, guided in said channehcontacts carried. by said cross bar,' relatively .sta-

ti'onary' contacts on the base adapted to be bridged by said contacts on the cross bar, U- shaped springs at the opposite endsof the with the crossbar and its opposite end bearing against a'relatively stationary support,

' v and means for forcing the cross bar inward 15 against the tension of said U-shaped springs. 8. Ina switch of the character set forth,

an insulating base having spaced projections on'the face thereof formin a guide channel, a cross bar guided in sai channel,

contacts carried by said cross bar, relatively stationary contacts on the base adapted to be bridged by said contacts on the cross bar,

U-shaped springs at the opposite ends of thecross bar and each having one end connected with'the cross bar and its opposlte end bearing against a relatively stationary support,

actuating the switch operating means in the closing movement of the cover.

CLARENCE D. PLAT'I.

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