Screw-Type Cap and Safety Cap

Abstract

There are provided a screw-type cap which can secure necessary fastening torque (opening torque) even in a case of a container having a plug having a foremost end portion of a small diameter and also a safety cap which cannot be opened by only rotation and therefore has a child resistance effect. A safety cap 20 consists of a screw-type inner cap 21 and an outer cap 22 which is mounted in such a manner that it covers the inner cap 21 and can be rotated and can displace axially within a limited distance. The outer cap 22 can rotate integrally with the inner cap 21 by pushing down the outer cap 22 and rotate it while the outer cap 22 rotates idly by rotation only. A plug portion 8 is formed by projecting a plug 6 from a disk portion 7 which is in abutting engagement with a tip end portion of a mouth portion 2 of the container. The inner cap 21 has a small diameter portion 21 c formed in the inner middle portion thereof. The small diameter portion 21 c is in abutting engagement with the disk portion 7 and controls interference by screwing. By causing the small diameter portion 21 c of the inner cap 21 against the disk portion 7 of the plug 6 , interference can be controlled to prevent excessive fastening and necessary fastening torque (opening torque) can be secured even in a case where the cap has the plug portion having a small diameter while idle rotation can be secured to achieve a child resistance effect.

1 . A screw-type cap comprising a plug member attached to a mouth portion of a container and having a narrowed foremost end portion, and a cap covering the plug member and screwed onto a screw portion of the mouth portion of the container and sealed with the foremost end portion of the plug member, said plug member having a disk portion which is in abutting engagement with a tip end portion of the mouth portion of the container and a plug portion projecting from the disk portion, and said cap having a small diameter portion formed in the inner middle portion thereof, said small diameter portion being in abutting engagement with the disk portion of the plug member and controlling interference by screwing. 
   
   
       2 . A screw-type cap as defined in  claim 1  wherein the small diameter portion of the cap is formed by providing a recess in a top portion of a large diameter portion of the cap and the outer configuration of the cap is formed in a cylinder. 
   
   
       3 . A safety cap as defined in  claim 1  wherein a safety cap is formed with said cap which constitutes an inner cap and an outer cap which covers the inner cap and is mounted on the inner cap rotatably about the inner cap and also axially slidably within a limited range in such a manner that the outer cap can move integrally with the inner cap by pushing down the outer cap and rotating the outer cap while the outer cap can rotate idly by rotating the outer cap without pushing it down, said inner cap having a small diameter portion formed in the inner middle portion thereof, said small diameter portion being in abutting engagement with the disk portion of the plug member and controlling interference by screwing. 
   
   
       4 . A safety cap as defined in  claim 3  wherein the small diameter portion of the inner cap has a stepped portion on the outside thereof and either one of a ratchet wheel and a ratchet pawl of a ratchet mechanism which can be brought to meshing engagement with each other by pushing down and rotation of the outer cap and can be rotated idly relative to each other by rotation only is provided on either one of the stepped portion and a top portion of the outer cap and the other of the ratchet wheel and the ratchet pawl of the ratchet mechanism is provided on the other of the stepped portion and the top portion of the outer cap. 
   
   
       5 . A safety cap as defined in  claim 3  further comprising energizing means for enabling maintaining of the idle rotation which is provided between the inner cap and the outer cap. 
   
   
       6 . A safety cap as defined in  claim 4  wherein the ratchet wheel constituting the ratchet mechanism is formed in a lightened structure. 
   
   
       7 . A cap as defined in  claim 1  wherein the seal between the foremost end portion of the plug member and the cap or the inner cap is substituted by, or added with, a valve mechanism for preventing leakage of contents of the container which is provided on the plug member. 
   
   
       8 . A cap as defined in  claim 1  further comprising a coupler consisting of a socket having a valve and energizing means for energizing the valve in closing direction and a plug having a valve and energizing means for energizing the valve in closing direction and being detachably fitted to the socket, said plug, in the state of being fitted to the socket, opening the both valves to communicate the socket with the plug, either one of the socket and the plug of the coupler being provided on either one of the plug member and a member on a demander side which receives contents of the container, and the other of the socket and the plug of the coupler being provided on the other of the plug member and the member on a demander side which receives contents of the container. 
   
   
       9 . A cap as defined in  claim 1  wherein the container is a container for liquid fuel. 
   
   
       10 . A cap as defined in  claim 9  wherein the container is a container for methanol