METER RING LOCKING DEVICE
A utility meter clamping ring is locked to the meter by a locking device that locks the free ends of the ring together automatically without the use of a separate plunger device. A latch is spring loaded in the locking device housing in a normally biased lock position. The lock device is secured to one free end of the clamping ring. An apertured blade is attached to the other free end of the clamping ring. The ring is placed about the flanges of the meter cover and base flanges and the blade is then inserted into the locking device housing where its aperture is engaged automatically by the spring loaded latch and locked to the housing upon insertion. A conventional plunger key may optionally be used to unlock the latch and release the blade from the locked position to free the ends for removal of the meter cover via an optional bore in the latch engaged by the key. The latch may be optionally permanently locked to the blade so that either the locking device or the ring has to be destroyed. Weakening grooves are in the ring of the latter embodiment to facilitate breaking the ring open. Embodiments are disclosed for use with F and G type plunger unlock keys and include an anti-tampering sleeve for use in the lock to preclude tampering disengagement of the lock of the type used with an F type key.
This application claims the benefit of provisional applications Ser. No. 60/689,027 filed Jun. 9, 2005; Ser. No. 60/725,552 filed Oct. 11, 2005; and Ser. No. 60/743,842 filed Mar. 28, 2006, each entitled “Meter Ring Locking Device” and each incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION1. Field of the Invention
This invention relates to meter clamping rings for securing and locking a utility meter cover to its base housing.
2. Description of the Prior Art
Utility electric meters have transparent covers that are secured to the meter mechanism in a base unit. The covers are typically circular cylindrical transparent glass cup shaped members and have an annular rib at an edge flange. The meter base unit has a circular cylindrical housing with an annular flange that abuts the cover edge flange. A meter ring engages the flanges of the cover and base unit clamping the cover to the base unit housing.
The clamping ring is usually a metal split ring with a flange at a first end with an aperture. A second end adjacent to the first end has a locking device attached. The locking device is used to lock the two ends together. The locking device has a bore which receives a locking bolt or barrel, which is a separate piece which is releasably inserted into the device bore. The barrel is inserted into the bore to engage the flange aperture and when engaged precludes the withdrawal of the flange. The barrel also includes a mechanism that locks the barrel in place in the locking device bore. See U.S. Pats. Nos. 4,674,304 and 4,446,603 to Guiler, and U.S. Pat. No. 4,008,585 to Lundberg, for example.
U.S. Pat. No. 4,015,456 discloses a plunger operated lock, which more recently has been used with meter rings to lock the rings in the clamped state. The plunger is in the form of a barrel, which is inserted into the lock bore as discussed above. The lock opened by a separate retracting device, known in this art as a key, which engages the plunger or barrel and retracts the plunger from its lock state and withdraws it from the bore. The key may take different forms and examples of which appear in
U.S. Pat. No. 5,301,524 discloses a repairable key for a plunger lock of the type used for locking utility meter clamping rings and is incorporated by reference herein in its entirety. This key has a camming frusto-conical head which engages split resilient fingers at the end of the key. The camming head spreads the normally closed fingers apart to cause the fingers to releasably frictionally engage the bore of a clamp ring locking plunger. The spread fingers when cammed radially outwardly, frictionally grip the interior of the locking plunger bore into which the fingers of the key are inserted, enabling the plunger to be pulled free of the plunger lock housing bore to free the two ends of the ring and release the meter cover from the base unit. The key has a camming lever which when rotated cams the fingers apart and also lifts the fingers and grasped plunger from the lock bore. A key of this type is commonly used today with utility meter plunger locks. Utility meter employees thus carry with them keys of this type to open the meters for repair or internal meter work.
U.S. Pat. Nos. 5,315,849 and 5,378,030 disclose still other types of plunger lock devices for use with utility meter clamping rings. As in the previously discussed patents, these plunger locks are separate from the utility meter clamp rings.
SUMMARY OF THE INVENTIONThe present inventors recognize a problem with the aforementioned plunger lock devices for use with utility meter clamping rings. Utility meters are installed initially by electricians not associated with utility companies that utilize and service the meters. The electricians can not lock the meters with clamping rings as they do not have the associated keys. The keys are important because the utility company needs to exercise tight control over them. The keys permit the meters to be opened and thus tampered with if the keys are in the wrong hands. Control of the keys presents a problem to the utility companies. Each time a meter needs to be clamped with roost clamping devices in use, a service technician is required to carry a key to lock the plunger lock. Thus for each installed meter that requires a clamping ring, a technician and key are required to lamp the ring to lock the meter. This requires numerous keys. Since such keys can open the clamping ring, tight control of such keys requires a tracking system to keep track of all keys in use at all times. This can be costly and cumbersome.
Also, the plunger locks generally are separate devices and sometimes can be lost or become inoperative. This can create a further problem with respect to locating or carrying spare plunger locks, which is also costly and cumbersome to utility companies which have hundreds, if not thousands, of such meters which require service.
There are clamping rings available which include plunger locks attached to the clamping rings. These plunger locks do not need keys to lock, but do need to be manually actuated to lock the ring by pushing the lock into locking engagement. This creates a problem if the operator overlooks pushing the lock into locking position.
A solution to these problems according to an embodiment of the present invention is provided by a clamping ring assembly comprising a split ring for clamping a cover to a base, e.g., a utility meter cover and base. The ring has opposing adjacent free ends. A locking device has mating male and female elements attached to the respective opposing free ends of the ring. The mating male and female elements automatically lock the ring free ends together in a cover clamping mode when the mating male and female portions become engaged in the clamping mode.
In one embodiment, the female element includes a reciprocating latch for engaging the male element in a lock position of the latch, the latch reciprocating on an axis, the latch having a bore for receiving a key for frictionally engaging the latch and for axially displacing the latch to an unlock position disengaged from the male element along the axis.
In a further embodiment, the female element includes a housing with a reciprocating resiliently secured latch attached to a first ring end and interior of the housing, the male element comprising a blade attached to a second ring end and having an aperture for automatically receiving the resiliently secured latch in a locking mode, the housing for receiving the blade in the housing interior, the latch for locking the blade to the housing upon insertion of the blade into the housing interior.
Preferably the housing has a slot for receiving the blade.
In a further embodiment, the locking device is arranged to be permanently locked requiring either the locking device or the ring of the ring assembly to be destroyed to unlock the assembly.
In accordance with an embodiment of the present invention, the latch does not need a key to lock, locks automatically upon clamping the ring to the utility meter and does not separate from the housing in the unlock state of the blade, avoiding the problems with the prior art ring clamping devices. One problem avoided is where a key is required for installation of each clamping ring, requiring numerous keys and their attendant tight control. A further problem is avoided where the separated plungers may become lost or damaged, such as when dropped or otherwise mishandled, and require replacement plungers to be carried by service technicians, not necessary with the various embodiments of the present invention. With the embodiments of the present invention, the service technician need not carry a key to install the clamping ring minimizing the extent to implement key control for numerous keys no longer necessary. Installation of meter clamping rings is widespread as compared to merely servicing an occasional meter for repair, which requires a key for opening the meter. In addition, non-utility company workers such as electricians can install the clamping rings according to embodiments of the present invention, since no key is required. This results in substantial cost savings.
In a further embodiment, there is at least one weakening groove in the ring for destructively opening the locked ring for that embodiment in which the locking device can not be key opened.
In a further embodiment, the locking device has no key and can not be non-destructively opened.
In as further embodiment, an anti tampering split sleeve is used in a locking device for precluding tampering unlocking of a latch of the type for use with an F type key.
IN THE DRAWING
In
The ring 22 is split at location 24 forming the ring 22 with two adjacent facing free ends 26 and 28. A ring locking device 30, forming a female element,
In
The end portion 38 has a slot 48 through which the flat blade 40 passes as shown in
In
In
In
The latch 52,
In
The housing 50,
The fingers are spread radially outwardly by rotation of the handle 108 cam 119 against the top surface 115 of the key cap 117. The spread fingers form an enlarged diameter that frictionally grips the smaller interior of the locking latch bore 84 into which the fingers 106 of the key are inserted. As the handle is rotated, its camming action at the same time lifts the sleeve 113 of the key 100 in direction 112. This lifting action causes the expanded fingers to pull the latch 52 in the withdrawal unlocking direction 112, and in direction 93,
This action disengages the pulled latch from the blade 40 aperture 46 (
In operation, in
There is a tampering problem in industry in use of the F type key in the lock device of
The clamping ring lock 97 embodiment of
In
Spring 88 is captured between flange 103 of the guide 54 and the shoulder 105 of the latch 52 (
In operation, a tampering tool can only engage the sleeve 99. If the tampering tool engages the sleeve it can only slide the sleeve partially along the axis 60 until the sleeve abuts the flange 103. Thus a tampering tool can not defeat the lock. This lock 97 is used with the F type key of
In operation, in
In
The ends 26 and 28 of the ring 22,
To lock the cover 14 to the base 12,
In
In
In
In
A rib 268 is molded to the housing 250 in the chamber 262 adjacent to and spaced from the cam surface 266 of the camming member 264. The rib 268 serves as a guide for the blade 148 as it enters into the slot 258 in cooperation with the camming member 264. The chamfer 154 at the blade 148 leading edge may engage the rib 268 for guiding the blade during insertion into the slot 258. The member 264 and rib 268 may be molded in one piece with the housing 250, which may be cast metal, such as zinc and the like. A second rib 270 extends into the chamber 262 from housing wall 272. The ribs 268 and 270 lock the ring 116 at end 142 to the housing 118 in the housing chamber 262.
In
As seen in
In
In
The latch 52′ of
Because of the presence of the post, the F type key of
Reference is made to
Thus there has been shown a utility meter clamping ring that automatically locks when the locking blade at one end of the ring is inserted into the mating slot of the lock attached to the other end of the split ring. In one embodiment a key can open the lock and in another embodiment, the ring or lock need to be destroyed in order to open the ring.
Locks are disclosed which may be used with different key types such as F or G keys used with commercially available plunger locks.
It will occur to one of ordinary skill that various modifications may be made to the disclosed embodiments. For example, the latch bore 84,
Claims
1. A clamping ring assembly comprising:
- a split ring for clamping a cover to a base, the ring having opposing adjacent free ends; and
- a locking device having mating male and female elements attached to the respective opposing free ends for locking the ring free ends together in an engaged clamping mode as the mating male and female elements are placed into the engaged clamping mode.
2. The assembly of claim 1 wherein the female element includes a reciprocating plunger latch for engaging the male element in a engaged clamping mode lock position of the latch, the latch reciprocating on an axis, the latch having a bore for receiving a key for frictionally engaging the latch and for axially displacing the latch to an unlock position disengaged from the male element along the axis.
3. The assembly of claim 1 wherein the female element includes a housing with a reciprocating resiliently secured latch attached to a first ring end and interior of the housing, the male element comprising a blade attached to a second ring end and having an aperture for automatically receiving the resiliently secured latch in a locking mode as the male element is engaged with the female element, the housing for receiving the blade in the housing interior, the latch for locking the blade to the housing upon insertion of the blade into the housing interior.
4. The assembly of claim 3 wherein the housing has a slot for receiving the blade.
5. The assembly of claim 3 wherein the latch is permanently attached to the housing in the unlock state of the blade.
6. The assembly of claim 1 wherein the locking device is arranged to be permanently locked and requires destruction of one of the lock and ring in order for the ring to be opened.
7. A utility meter clamping ring assembly comprising:
- a resilient split ring having locked and unlocked states for clamping a utility meter cover to a meter base, the ring having first and second facing opposing ends, the first end including a blade having an aperture;
- a housing secured to the second end, the housing having a bore, the housing having a slot in communication with the bore for receiving the blade; and
- a resiliently movable latch in the bore, the latch for resiliently engaging the aperture of the received blade to lock the blade to the housing in a ring locked state in response to the insertion of the blade into the slot when the blade aperture is aligned with the latch for receiving the latch.
8. The assembly of claim 7 wherein the housing bore is in communication with a region external the housing through a housing opening, the latch having a bore for receiving a key through the housing opening and which key selectively disengages the latch from the blade aperture to place the ring in the unlocked state by frictionally engaging the latch and withdrawing the latch from the blade aperture.
9. The device of claim 7 wherein the blade defines a plane, the housing bore is circular cylindrical and the latch is circular cylindrical and reciprocates in the housing bore in a direction that is normal to the plane of the blade.
10. The assembly of claim 9 wherein the latch has a locked and unlocked position, the device including a spring in the housing bore for normally biasing the latch in a blade lock position with a locking portion in said slot.
11. The assembly of claim 7 wherein the housing bore defines a longitudinal axis, the slot defining a plane that is normal to the longitudinal axis.
12. The assembly of claim 7 wherein the blade defines a plane, the latch reciprocating in the bore in a direction normal to the plane of the blade.
13. The assembly of claim 7 wherein the latch and blade are arranged such that the blade is automatically locked to the housing when the blade is inserted in the slot.
14. The assembly of claim 7 wherein the latch is permanently locked in the locked state and the ring can only be opened by destruction of the ring or the housing-latch assembly.
15. The assembly of claim 7 wherein the latch is permanently secured in the housing bore.
16. The assembly of claim 7 wherein the latch includes a key receiving bore for releasably receiving a latch key for disengaging the latch from the blade aperture.
17. The assembly of claim 7 including a guide in the housing bore.
18. The assembly of claim 17 wherein the guide has an opening for receiving a latch key for unlocking the latch from the blade.
19. The assembly of claim 17 wherein the guide has a bore for receiving the latch and encloses the housing bore permanently securing the latch to the housing.
20. The assembly of claim 17 including at least one weakening groove in the ring for destructively opening the locked ring.
21. The assembly of claim 7 wherein the latch has a key receiving bore, the key for selectively frictionally engaging the latch through the housing opening and for selectively disengaging the latch from said blade aperture to permit unlocking of the blade from the housing, and a cylindrical sleeve captured in the latch key receiving bore, the sleeve having a longitudinal slot for enabling the sleeve to resiliently grip the latch in response to operation of the key for said selective resilient engaging.
22. A utility meter locking ring assembly comprising:
- a resilient ring that has a split region forming first and second facing adjacent ends, the ring having locked and unlocked states for locking a utility meter cover to a meter base, the first end including a flat blade having a through aperture;
- a housing having a bore in communication with an exterior region external the housing through an opening in the housing, the bore defining a longitudinal axis, the housing being secured to the meter ring second end, the housing having a slot for receiving the blade in a direction normal to the longitudinal axis in a ring locked state, the aperture of the received blade being aligned with the bore in the locked state of the blade to the housing; and
- a latch resiliently secured to the housing for reciprocating in the housing bore along the longitudinal axis and forming a latch for normally automatically resiliently engaging the aperture to lock the blade to the housing upon insertion of the blade into the housing slot.
23. The assembly of claim 22 wherein the latch has a key receiving bore, the key for selectively frictionally engaging the latch through the housing opening and for selectively disengaging the latch from said blade aperture to permit unlocking of the blade from the housing.
24. The assembly of claim 22 wherein the latch is permanently placed in the locked state and the device can not be opened without destruction of either the device or the ring.
25. The assembly of claim 23 further including a cylindrical sleeve captured in the latch key receiving bore, the sleeve having a longitudinal slot for enabling the sleeve to resiliently grip the latch in response to operation of the key for said selective resilient engaging.
Type: Application
Filed: May 3, 2006
Publication Date: Dec 14, 2006
Inventors: Robert Debrody (Wayne, NJ), Richard Dreisbach (Lafayette, NJ), Carlos Pinho (North Arlington, NJ)
Application Number: 11/381,384
International Classification: B65D 55/14 (20060101);