Patent Number: 043141579
Section: claims

1. A lock for securing a radiation source in a shield comprising: a flexible member to which the radiation source is secured, which flexible member has a stop spaced from the radiation source;  means for trapping the stop, said means having a trapping and an untrapping position;  first means for biasing said trapping means to the trapping position;  means for receiving said stop having means for engaging said trapping means, said receiving and engaging means having an engaging position and a releasing position;  second means for biasing said receiving and engaging means toward the engaging position, wherein said engaging means can engage said trapping means in the untrapping position, and wherein said trapping means is urged to the trapping position by said first biasing means with the engaging means in the release position; and  wherein said engaging means includes a pin and wherein said trapping means includes means for receiving said pin and wherein said pin is received in the pin receiving means of said trapping means to engage said trapping means in the untrapping position.  a flexible member to which the radiation source is secured, which flexible member has a stop spaced from the radiation source;  means for trapping the stop, said means having a trapping and an untrapping position;  first means for biasing said trapping means to the trapping position;  means for receiving said stop having means for engaging said trapping means, said receiving and engaging means having an engaging position and a releasing position;  second means for biasing said receiving and engaging means toward the engaging position, wherein said engaging means can engage said trapping means in the untrapping position, and wherein said trapping means is urged to the trapping position by said first biasing means with the engaging means in the release position; and  wherein said trapping means has another trapping position and wherein said receiving means includes another engaging means for engaging said trapping means in the another trapping position.  a flexible member to which the radiation source is secured, which flexible member has a stop spaced from the radiation source;  means for trapping the stop, said means having a trapping and an untrapping position;  first means for biasing said trapping means to the trapping position;  means for receiving said stop having means for engaging said trapping means, said receiving and engaging means having an engaging position and a releasing position;  second means for biasing said receiving and engaging means toward the engaging position, wherein said engaging means can engage said trapping means in the untrapping position, and wherein said trapping means is urged to the trapping position by said first biasing means with the engaging means in the release position; and  wherein said trapping means includes a slide having an aperture, a first portion of which allows said stop to pass therethrough and a second portion of which allows only said flexible member to pass therethrough and wherein said first position is aligned with said stop when said trapping means is in the untrapping position. 2. The apparatus of claim 1 wherein the flexible member has a connector spaced from the stop, the receiving means defining a passage for receiving the portion of the flexible member between the stop and the connector so that the connector extends out of the passage, wherein pulling on the connector moves said receiving and engaging means to the releasing position. 3. A lock for securing a radiation source in a shield comprising: 4. The apparatus of claim 3 including key means for locking said trapping means in the another trapping position. 5. The apparatus of claim 3 wherein said lock includes a housing and said trapping means includes an indicator tab extending from said housing, and wherein said tab extends farther from said housing with the trapping means in the trapping position than in the untrapping position, and wherein said tab can be urged toward said housing against said first biasing means to position said trapping means in the untrapping position. 6. The apparatus of claim 3 wherein said trapping means defines an aperture which has a first portion elongated in the direction of travel of said slide and a second portion extending laterally from said first portion and wherein said lock includes means for locking said trapping means which is selectably positionable in said first portion of said aperture to allow said slide to move and in said second portion of said another aperture to lock said trapping means in the another trapping position. 7. The apparatus of claim 5 wherein said tab extends farther from said housing with said slide in untrapping position than in the another trapping position, and wherein with the engaging means in the release position said tab can be urged against said first biasing means to position said trapping means in the another trapping position. 8. The apparatus of claim 6 wherein said locking means includes a pin eccentrically mounted to a rotatable cylinder. 9. The apparatus of claim 8 including key means for rotating said rotatable cylinder. 10. A lock for securing a radiation source in a shield comprising: