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US 4,639,249 AGranted
Latch integral with latched apparatus
OwnerEldon E. Larsoninventor
Life of this patent
Estimating the term…
Abstract
The disclosure relates to a syringe latch apparatus which prevents movement of the syringe piston beyond a certain distance into the cylinder. The latch element is a rectangular segment of the cylinder wall.
Claims8
An apparatus comprising first and second elements made of resilient material and in sliding contact with each other, said second element being movable in a first direction with respect to said first element and in a second direction opposite to said first direction and having a face surface essentially perpendicular to said first and second directions, latch apparatus comprising:
- a rectangular leaf spring integral with said first element and having:
- a first side,
- a second side,
- a first end, and
- a second end and
- a width W, the distance from said first side to said second side,
- said first and second sides being essentially parallel to said first and second directions, said first side being separated from said first element by a first slit having a width w1 and said second side being separated from said first element by a second slit having a width w2,
- said second end being separated from said first element by a slit having a width w3,
- said first end being integral with said first element and being located a distance L in said first direction from said second end, L being the effective length of said leaf spring and of said first and second slits,
- said leaf spring being formed so that said second end is positioned to abut said face surface of said second element, whereby said second element is prevented from moving in said first direction relative to said first element,
- means for deflecting said leaf spring to move said second end out of abutment with said face surface, whereby said second element is freed for sliding motion in said first direction relative to said first element.
8 more elements
Dependencies are inferred from the claim text.