초록 ▼

A depression head for pump mechanism increasing sealability on the discharge port and enabling favorable shutting of the liquid leakage, said depression head comprising a mounting cylinder assembly 3 having an upright sliding cylinder communicating with the interior of the stem 2; a body 4 adapted

A depression head for pump mechanism increasing sealability on the discharge port and enabling favorable shutting of the liquid leakage, said depression head comprising a mounting cylinder assembly 3 having an upright sliding cylinder communicating with the interior of the stem 2; a body 4 adapted to be depressible relative to the mounting cylinder assembly 3 and having an attachment cylinder 11 fitted on the sliding cylinder, a valve chamber disposed above the attachment cylinder and defining a discharge port 12 opened its leading end; a valve member 5 forwardly biased to close the discharge port 19 and defining a passage between the discharge port and a communication port 12 which is also communicating with the interior of a pump cylinder; and a lever member 6 for coupling to the valve member 5 to open the discharge port in response to the depression of the head; wherein a resistive force against the depression of the body with respect to the stem is smaller than a resistive force against the depression of the stem itself.

대표청구항 ▼

The invention claimed is: 1. A depression head for attachment on a pump having a depressible and upwardly urged stem, said depression head comprising; a mounting cylinder assembly having a top plate, a mounting cylinder depending from an underside of the top plate for fitting on an upper end of the

The invention claimed is: 1. A depression head for attachment on a pump having a depressible and upwardly urged stem, said depression head comprising; a mounting cylinder assembly having a top plate, a mounting cylinder depending from an underside of the top plate for fitting on an upper end of the stem, and a sliding cylinder extending upwardly from the top plate and communicating with the stem, a body capable of depressing with respect to the mounting cylinder assembly, said body including an attachment cylinder for slidable and depressible fitting on an outside of the sliding cylinder, a valve chamber disposed above the attachment cylinder and having a discharge port defined at its leading end, said valve chamber communicating with the attachment cylinder through a communication port, a valve member for insertion into the valve chamber and being forwardly urged to close the discharge port and having a sealing portion making a liquid tight contact with a rear portion of the valve chamber, such that a liquid passage from the communication port to the discharge port is defined between the valve member and the valve chamber forwardly of the sealing portion, a lever member having an upper portion coupled to a rear end portion of the valve member, and a lower end portion contacting to an upper side of the top plate for coacting therewith, said lever member being pivoted swayably capable of pulling the valve member rearward, upon depression of the body with respect to the mounting cylinder assembly, characterized in that a resistive force against the depression of the body with respect to the stem is smaller than a resistive force against the depression of the stem itself. 2. The depression head set forth in claim 1, characterized in that the valve member has a skirt like portion protruding rearward from its periphery, and in that the sealing portion is turned back from a rear end of the skirt like portion and configured into an inverted skirt-like shape, such that the sealing portion is slidably engaged within a rear portion of the valve chamber. 3. The depression head set forth in claim 1, characterized in that the valve member is made of flexible and elastic material, and in that the valve member is provided at its periphery with a flange-like elastic wall from which the sealing portion is extending to and fitting within a rearward end portion of the valve chamber, such that the valve member is urged forwardly by a biasing force of the elastic wall to close the discharge port. 4. The depression head set forth in claim 1, characterized in that the valve member comprises; an elastic member made of flexible and elastic material and defining a cylinder member with a closed front end, said cylinder member being provided at its periphery with a flange-like elastic wall from which the sealing portion is extending to and fitting in a rearward end portion of the valve chamber liquid-tightly; a core member made of stiff material having a front portion for fitting in and fixing to the cylinder member, and a rear end portion protruding rearwardly; such that the valve member is urged forwardly by a biasing force of the elastic wall to close the discharge port. 5. The depression head set forth in claim 1, characterized in that the body comprises a peripheral wall, and a lateral cylinder defining at its inside the valve chamber with a front end being opened through a front portion of the peripheral wall, and in that the valve chamber is formed with a rear portion of the lateral cylinder, a rear wall for closure of a rear end of the lateral cylinder, and a nozzle cylinder which is fitted into a front portion of the lateral cylinder so as to define the discharge port at its front end, and in that the body also comprises a sealed cylinder protruding forward from a front side of the rear wall for slidably fitting the sealing portion therein, while the rear wall has within the sealed cylinder port hole through which the rear end portion of the valve member is protruding for coupling to the upper end portion of the lever member. 6. The depression head set forth in claim 1, characterized in that the body comprises a peripheral wall, and a lateral cylinder defining at its inside the valve chamber with a front end being opened through a front portion of the peripheral wall, and in that the valve chamber is formed with a rear portion of the lateral cylinder, a rear wall for closure of a rear end of the lateral cylinder, and a nozzle cylinder which is fitted into a front portion of the lateral cylinder so as to define the discharge port at its front end, and in that the nozzle cylinder has a rear portion forming the sealed cylinder for slidably receiving the sealing portion, and a communication hole defined forwardly of the sealed cylinder, and in that the rear wall is provided with a port hole through which a rear end portion of the valve member is protruding for coupling to an upper end portion of the lever member. 7. The depression head set forth in claim 5, further comprising an anti-rotation mechanism formed on the mounting cylinder assembly and the body so as to allow up-down movement and check rotation of the mounting cylinder with respect to the body. 8. The depression head set forth in claim 7, characterized in that the mounting cylinder assembly has a pair of engagement plates extending upwardly and downwardly from on both side of the top plate such that the anti-rotation mechanism is defined between the outside of the respective engagement plate and an inside of the peripheral wall of the body, and in that an attachment cylinder for attachment to the mounting cylinder assembly is depending from the lateral cylinder into a space between the pair of engagement plates. 9. The depression head set forth in claim 6, further comprising an anti-rotation mechanism formed on the mounting cylinder assembly and the body so as to allow up-down movement and check rotation of the mounting cylinder with respect to the body.