Vacuum break switch shock absorber
View Patent ↗An underarm gang operated vacuum break switch (underarm switch) has an electrically live portion under a mounting arm, which provides advantages over the standard vacuum break switch, which have the electrically live portion above the mounting arm. Because the non-electrified mounting arm is above the electrified portion, the underarm switch is safer for perching birds and other wildlife. The nature of the underarm switch also provides other benefits including a disconnect blade that when opened creates a visual gap to ensure electrical discontinuity along with a safety locking arm tied to deactivating the underarm switch. Adding to the safety measures is a visual indicator that shows an electrician when the switch is live and safe to open the disconnect blade. Other safety measures include a shock absorber assembly and inertia slowing mass protecting electrical contacts within the vacuum break switch from failing.
1. A power line vacuum switch comprising:
a vacuum bottle switch that includes a fixed electrical contact and a dynamic electrical contact;
a switch actuator that includes an open/close circuit linkage that is connected to the dynamic electrical contact via a dynamic contact shaft and a shock absorber assembly,
the shock absorber assembly comprising a housing defined by at least one housing side wall that extends from a base to a housing top, the at least one housing side wall fixedly connected to the base and housing top, the housing top comprising a shock absorber housing port,
a coil spring disposed inside of the housing and connected to the base,
the open/close circuit linkage connected to the base outside of the housing,
the power line vacuum switch comprising an open orientation with the dynamic electrical contact separated from the fixed electrical contact and with the coil spring in an uncompressed state, in the open orientation, the housing is in a first position;
the power line vacuum switch comprising a closed orientation with the dynamic electrical contact connected to the fixed electrical contact and the housing in a second position, the housing is closer to the fixed electrical contact in the second position than when in the first position,
when in the closed orientation, the coil spring is in a compressed state,
the open/close circuit linkage spaced closer to the fixed electrical contact in the closed orientation as compared to the open orientation,
the coil spring, the base, the fixed electrical contact, the dynamic electrical contact, and the shock absorber housing port are symmetric about an axis.
2. The power line vacuum switch of claim 1 , wherein the dynamic contact shaft comprises a spring compression hub and a stop flange, the spring compression hub is configured to slide in and out of the shock absorber housing port, and the stop flange is captured within the housing.
3. The power line vacuum switch of claim 1 , wherein the coil spring has a higher resistance when in the closed orientation than when in the open orientation.
4. The power line vacuum switch of claim 1 , wherein the coil spring is configured to slow down movement of the dynamic electrical contact when the dynamic electrical contact moves from the open orientation to the closed orientation.
5. The power line vacuum switch of claim 1 , wherein the open/close circuit linkage connects to the shock absorber housing via a housing-linkage extension arm.
6. The power line vacuum switch of claim 5 , wherein the open/close circuit linkage connects to the housing-linkage extension arm at a housing-linkage pivot point.
7. The power line vacuum switch of claim 1 , wherein the shock absorber housing is configured to move along the axis between the open orientation and the closed orientation.
8. A vacuum switch actuator comprising:
a linkage that drives a dynamic contact shaft and a spring housing closer to a vacuum bottle assembly when in a first position than when in a second position;
the dynamic contact shaft fixedly connected to a dynamic electrical contact that electrically connects to a fixed electrical contact only when in the first position;
a spring that is housed in the spring housing and interposed between the linkage and the dynamic contact shaft, the dynamic electrical contact comprises higher resistance from the spring when in the first position compared with the second position,
when in the first position the dynamic electrical contact and the fixed electrical contact are electrically connected inside of a vacuum bottle.
9. The vacuum switch actuator of claim 8 , wherein the spring is a coil spring.
10. The vacuum switch actuator of claim 9 , wherein the coil spring, the spring housing, the fixed electrical contact, the dynamic electrical contact, and a spring housing port, that accommodates the dynamic contact shaft, are symmetric about an axis.
11. The vacuum switch actuator of claim 8 , wherein the dynamic contact shaft comprises a spring compression hub and a stop flange, the spring compression hub is configured to slide in and out of a spring housing port, the stop flange is captured within the housing.
12. The vacuum switch actuator of claim 11 , wherein the dynamic contact shaft and the spring compression hub are a single piece of material.
13. The vacuum switch actuator of claim 8 , wherein the linkage connects to the spring housing via a pivot point in a housing-linkage extension arm.
14. The vacuum switch actuator of claim 8 , wherein the spring housing slidingly engages an anchor strap, which limits movement of the spring housing along the axis.
15. The vacuum switch actuator of claim 8 , wherein the spring is configured to slow down movement of the dynamic electrical contact when the dynamic electrical contact moves from the second position to the first position.
16. A method for slowing down contact between a fixed electrical contact and a dynamic electrical contact inside of a vacuum bottle, the method comprising:
moving the dynamic electrical contact from an open orientation to a closed orientation relative to the fixed electrical contact via an open/close circuit linkage, the closed orientation is when the fixed electrical contact is connected to the dynamic electrical contact; and
resisting the moving step via a coil spring that is housed in a spring housing and connected to a housing base of the spring housing, the coil spring is interposed between a dynamic contact shaft and a linkage platform, the dynamic contact shaft is connected to the dynamic electrical contact,
the dynamic contact shaft cooperates with the coil spring during the resisting step wherein the spring and the spring housing are closer to the fixed electrical contact when the dynamic electrical contact is in the closed orientation.
17. The method of claim 16 , wherein the coil spring is compressed during the resisting step.
18. The method of claim 16 , wherein the coil spring is inside of a shock absorber housing, the shock absorber housing comprising a dynamic contact shaft port on a first end and the linkage platform on a second end.
19. The method of claim 18 further comprising sliding the dynamic contact shaft through the dynamic contact shaft port along a common axis.
20. The method of claim 18 , wherein the coil spring, the dynamic contact shaft port, the fixed electrical contact, the dynamic electrical contact, and the dynamic contact shaft are symmetric about an axis.