US1736452A - Safety switch structure - Google Patents

Description

NOV. 19, 1929. J, F, MacWlLLlAMS 1,736,452

SAFETY SWITCH STRUCTURE Filed March 21, 1928 gyz,

Inventor j? Jifiril i'llmmg Amrngy Patented Nov. 19, 1929 v UNITED STATES JAMES F. MACWILLIAMS, OF CRESSON, PENNSYLVANIA SAFETY SWITCH STRUCTURE Application filed March 21, 1928. Serial No. 263,457.

The present invention pertains to improvements in switch structures and has for its principal object the promotion of the factor safety throughout its operable details.

' An important object is to provide switch structure for controlling electrical circuit, which includes a housing having an open side and a cover for said open side which can only be removed after the switch contacts have been disengaged.

Another object is to provide switch structure of the above character which includes means for maintaining the switch contact disengaged when the operating means employed have been detached therefrom.

Still another object resides in the provision of novel lock means for maintaining the switch element in contacting position, and at the same time locking the cover to the housing securely and against possibility of removal, excepting when the switch element 1s moved to open position.

Other novel and advantages will become apparent as the invention is better understood 1 26 from the following specification and claims.

In the drawings Figure 1 represents a cross sectional view through the switch structure, and disclosing the details thereof in sectional view.

Fig. 2 is a sectional View on the plane with the open side of the housing, disclosing the position of the contact carrier shown in disengaged position, and

Fi 3 represents a perspective view of the T slida le contact carrier.

the housing, while a hollow projection 1 is provided at the opposite end of the housing, and in substantial alinement with the boss 3.

A block 5 of insulating material, is arranged within the housing in the manner clearly shown in Fig. 1. This block is formed with a pair of spaced openings adapted to receive a fuse member or cartridge 6.

The conductor wires 7 may be led through the tubular nipple 2 at one.'side of the housmg. The cover which is generally referred to by numeral 8, comprises a plate 9 provided with a depending rectangular flange 10 which is adapted to fit snugly within the open side of the housing 1. The cover is provided with a laterally projecting flange 11 which engages over the open edge of the housing for protective purposes. The top side of the cover 1s provided with an upstanding nipple 12 thru which the conductors 13 are led.

As is clearly shown in Fig. 1, a block of insulating material 14: is secured within the flanged area of the cover, and formed throughout its length with a bore 15. A pair of spaced contact members 16 are secured within the block 1 1, so that theirouter ends are normally in contact with the respective ends of the fuses 6. A pair of contact members 17-17 are embedded in the block Hand spaced from the respective contacts 16 by the bore 15.

A slide 18 is provided with a pair of contacts 19-19 which extend transversely through the slides and terminate in flush relation with opposite sides of the same.

This slide is adapted for reciprocatory movement within the bore 15 in a manner so as to cause the contacts 1919; 17-17 and the contact 1616, for effecting a closed circuit.

The flange 10 of the cover is formed with an opening registrable with the open inner end of the hollow projecting 4 and a second opening at the opposite side of the cover registrable with the bore of the boss 3.

The slide 18 is provided at one end with a longitudinally projecting guide rod 20, which is adapted to have its outer end portion proj ected through the opening in the cover flange and for inserted disposition within the hollow projection 4., when the slide 18 is moved to contacting relation with the contact 17 respectively.

A coiled spring 21 convoluted about the guide rod 20, is adapted to have one end thereof bear against the flange of the cover, while its opposite end bears against the adjacent end of the slide 18, for tensionally maintains ing the opposite end of the slide in contact with the opposite portion of the flange and in open circuit position.

For the purpose of shifting the slide to closed position, a key 22 is insertible through the bore of the boss 3 so that its end portions will engage in a socket or suitable recess in the adjacent end of the slide. The boss 3 is formed with a bayonet slot 23, or in fact any similar formation, that may receive a pin 24 on the key, when the key has been forced inwardly and turned in the proper direction.

Obviously, when the key is moved i11- wardly, the slide 18 will be shifted in the bore 15, against the tension of the spring 21, by which movement, the guide rod 20 will engage in the hollow projection 4 through an openinginthe flange, 10. By turning the key slightly in the proper direction, the pin 24: will engage in the ofiset slot of the bayonet slot. 23, whereby the slide will be maintained in. closed. position with its contact in engagement with the contacts 16 and 17 respectively.

When, it is desired to remove the cover, the key 22 is removed so that the slide 18 will be urged to the position shown in Fig. 1, by the tension of the spring 21. In this position, with the key 22 removed, the cover may be lifted fromv its connection with the housing. Thus it will be seen that the circuit is broken and complete access available to all parts of the structure.

Having thus described my invention, what I claim as new is 1. In a switch structure comprising, a housing open at one side,a cover for said housing, said cover being provided with a rectangular shaped flange at its inner side, said flange being adapted to snugly fit within the housing, a slidable contact member carried by said cover at its inner side, a member at one end of theslidable contact for interlocking the cover'flange with. the housing, tensional means for-normallymaintainin the contact member in, opening position, an means for moving and locking the slidable contact in closed position; i

2., A, switch structure comprising a housing, said, housing being open at one side, a cover for the open side of the housing, a switch member movable within said housing, a bolt carried by the switch member for securing the cover to the housing, and a key for securing the cover to the housing, said key being operable to move the said switch member to closed positiom.

3 A switch structure comprising a housing, said housing being open at one side, a cover for the open side of the housing, a switch member movable within said housing, a bolt carried by the switch member for securing the cover to the housing, a key for securing the cover to the housing, said key being operable to move the said switch member to closed position, and complementary means between the key and the housing for retaining the switch member in closed position.

4. A switch structure comprising a housing, said housing being open at one side, a cover for the open side of the housing, a switch member movable within said housing, a bolt carried by the switch member for securing the cover to the housing, a key for securing the cover tothe housing, said key being operable to move the said switch member to closed position, and complementary means between the key and the housing for retaining the switch member in closed position, and spring means for moving the switch member to open position when the complementary means is released.

In testimony whereof I aifix my signature.

JAMES F. MACWILLIAMS.

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