Lever with shifting fulcrum point
First Claim
1. A pump mechanism comprisinga piston chamber forming member defining a chamber disposed about a pump axis and a piston element reciprocally slidable coaxially in the chamber along the pump axis,a lever having a first end, a second end and pivotable about a fulcrum member,the first end coupled to the piston element for relative pivoting about a first lever axis normal to the pump axis, characterized in that during pivotal movement in a first direction, the lever pivots during a first angular segment of pivoting about a first pivot point and during a second angular segment of pivoting about a second pivot point spaced from the first pivot point,the second pivot point spaced from the first pivot point in a direction generally parallel to the pump axis, andthe first pivot point and the second pivot point equidistant from the pump axis.
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Accused Products
Abstract
A lever with a shifting pivot or fulcrum point such that in pivoting of the lever between a first position and a second position for at least one angular segment of such pivoting about a first fulcrum point and for a second angular sector of such pivoting, pivots about a second fulcrum point.
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Citations
17 Claims
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1. A pump mechanism comprising
a piston chamber forming member defining a chamber disposed about a pump axis and a piston element reciprocally slidable coaxially in the chamber along the pump axis, a lever having a first end, a second end and pivotable about a fulcrum member, the first end coupled to the piston element for relative pivoting about a first lever axis normal to the pump axis, characterized in that during pivotal movement in a first direction, the lever pivots during a first angular segment of pivoting about a first pivot point and during a second angular segment of pivoting about a second pivot point spaced from the first pivot point, the second pivot point spaced from the first pivot point in a direction generally parallel to the pump axis, and the first pivot point and the second pivot point equidistant from the pump axis.
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16. A pump mechanism comprising:
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a piston chamber forming member defining a chamber disposed about a pump axis and a piston element reciprocally slidable coaxially in the chamber along the pump axis, a lever having a first end, a second end and pivotable about a fulcrum member, the first end coupled to the piston element for relative pivoting about a first lever axis normal to the pump axis, characterized in that during pivotal movement in a first direction, the lever pivots during a first angular segment of pivoting about a first pivot point and during a second angular segment of pivoting about a second pivot point spaced from the first pivot point, the fulcrum member intermediate the first end of the lever and the second end of the lever, the fulcrum member including a fulcrum corner and a fulcrum apex defined at either end of a central fulcrum face, the lever including a lever apex and a lever corner defined at either end of a mid fulcrum face, a distance between the fulcrum corner and the fulcrum apex being equal to a distance between the lever apex and the lever corner, the first pivot point defined by the fulcrum apex being received in the lever corner, the second pivot point defined by the lever apex being received in the fulcrum corner, in the intermediate position of the lever the fulcrum apex is received in the lever corner simultaneously with the lever apex being received in the fulcrum corner, the fulcrum corner defined at the intersection of a first end of the central fulcrum face with a first fulcrum face which extends from the central fulcrum face toward the pump axis, the fulcrum apex defined at the intersection of a second end of the central fulcrum face with a second fulcrum face which extends from the central fulcrum face away from the pump axis, the lever apex is defined at the intersection of a first end of the mid lever face with a first lever face which extends from the mid lever face towards the pump axis, the lever corner is defined at the intersection of a second end of the mid lever face with a second lever face which extends from the mid lever face away from the pump axis, the central fulcrum face is parallel to the pump axis and the first fulcrum face is normal to the pump axis. - View Dependent Claims (17)
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Specification