Hand held pump

• US 20060216171A1
• Filed: 03/23/2005
• Published: 09/28/2006
• Est. Priority Date: 03/23/2005
• Status: Abandoned Application

• Current Assignee: Alltrade Tools LLC
• Original Assignee: Alltrade Tools LLC
• Inventors: Hernandez, Hector Ray
• Application Number:
  US11/088,956
• Publication Number:
  US 20060216171A1
• Time in Patent Office: Days
• US Class Current: 417/437
• CPC Class Codes: A61M 1/80 Suction pumps A61M1/64, A61M1/71, A61M60/00 take precedence
• CPC Class Codes: A61M 1/81 Piston pumps, e.g. syringes
• CPC Class Codes: A61M 2205/073 Syringe, piston type
• CPC Class Codes: A61M 3/0262 manually, e.g. by squeezing a bulb

Abstract

A hand held vacuum and pressure pump has a fixed handle, with a movable handle pivotally connected thereto at one end thereof, the fixed handle being fixed to a pump cylinder so as to be perpendicular thereto. A spring loaded piston rod extends from the movable handle through the fixed handle and is fixedly attached at one end to a piston which is contained in the pump cylinder and has a peripheral O-ring forming a seal therewith. Valve means controls whether manual movement of the movable handle toward the fixed handle forces fluid contained in the cylinder out of the cylinder or draws fluid into the cylinder. The movable handle has a longitudinal recess formed therein through which a connecting pin extends, the connecting pin being connected to the piston rod at the piston rod end remote from the piston, so that the arcuate movement of the movable handle toward and away from the cylinder permits the connecting pin to move longitudinally in the movable handle longitudinal recess, whereby the piston rod moves linearly when moving longitudinally in the cylinder, thereby avoiding canting the piston and so scuffing the O-ring when the piston rod moves longitudinally in the cylinder.

Claims

1. In a hand held vacuum and pressure pump of the type which has

a fixed handle, with a movable handle pivotally connected thereto so as to be arcuately movable with respect thereto, the fixed handle being fixed to a pump cylinder so as to be perpendicular thereto, the pump cylinder containing a piston to which a piston rod is connected at one end, a load spring disposed along at least a portion of the piston rod, and valve means which controls whether the pump acts as a vacuum pump or a pressure pump, whereby the pump is operated by selective relative movement between the movable handle and the fixed handle, the improvement comprising:

a longitudinal recess formed in the movable handle;

a connecting pin extending through the longitudinal recess; and

means connecting the connecting pin to the piston rod at the piston rod end remote from the piston;

whereby, in response to arcuate movement of the movable handle toward and away from the cylinder during pump operation, the connecting pin moves longitudinally in the movable handle longitudinal recess, so that the piston rod moves linearly when moving longitudinally in the cylinder, thereby avoiding canting the piston in the cylinder during piston rod movement.

2. In a hand held vacuum and pressure pump of the type which has a fixed handle with a movable handle pivotally connected thereto at one end thereof, the fixed handle being fixed to a pump cylinder so as to be perpendicular thereto, a spring loaded piston rod which extends from the movable handle through the fixed handle and is attached at one end to a piston contained in the pump cylinder, the piston having an O-ring forming a seal between the piston and the cylinder, and valve means which selectively controls whether the pump acts as a vacuum pump or a pressure pump, and which is operated by manual movement of the movable handle toward the fixed handle, the improvement comprising:

a longitudinal recess formed in the movable handle;

a connecting pin longitudinally slidably disposed in the longitudinal recess; and

means connecting the connecting pin to the piston rod at the piston rod end remote from the piston;

whereby the arcuate movement of the movable handle toward and away from the cylinder permits the connecting pin to move longitudinally in the movable handle longitudinal recess, so that the piston rod moves linearly when moving longitudinally in the cylinder, thereby avoiding canting the piston during piston rod movement.