Plunger lock for manual dispensing pump
US4479589A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1982 |
| Grant date | Oct 30, 1984 |
| Priority date | — |
| Expiry date | Jun 7, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/0037
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The plunger of the pump has an axial lock by which the plunger can be locked down in its fully depressed position during periods of non-use and a rotary lock for preventing inadvertent rotation of the plunger out of its locked down mode. The rotary lock includes a pair of yieldably spreadable arms which circle the collar of the pump and latch against one another in overlapping, embracing relationship so that the lock is held tightly on the collar against rotation relative thereto. A locking bar integral with the arms and of essentially rigid construction projects up out of the plane of curvature of the arms and has a saddle-like notch at its uppermost tip which complementally receives a portion of the spout associated with the discharge head of the plunger, thereby rendering the plunger rotatively immobile relative to the collar. If desired, hinge lines which permit the arms to flex toward and away from one another during installation and removal of the rotary lock from the pump may be intentionally designed to be in a sufficiently weakened condition as to permit at least one of the arms to be torn free from the remainder of the lock in order to release the latter from the pump. Ma…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.