§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US3782710A Expired / Lapsed US ⏱️ 0.0 years remaining

Adjustable hydraulic linear decelerator

Assignee: Sheffer Corp
•
Filing: 1972-11-08
•
Granted: 1974-01-01
•
Expires: 1992-11-08
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract The application discloses an adjustable hydraulic linear decelerator, which may be either of the spring return type having an internal accumulator, or of the air return type having an external accumulator. The device comprises a cylinder having a piston which operates, upon an impact, against hydraulic fluid charged into the cylinder. The cylinder has, along a generatrix, a series of exponentially spaced apertures, and is embraced by a sleeve having along a generatrix, a series of obturating slots of the same minimum axial width as said apertures, and cooperating with said apertures respectively. The sleeve is surrounded by a reservoir tube, annularly spaced therefrom, and is coupled to said tube so that it may be rotated by rotating said tube. The sleeve also has a guide slot cooperating with a pin fixed to said cylinder to limit the extent of rotation of said sleeve to the circumferential extent of said obturating slots. The obturating slots may be angularly disposed with respect to the circumference while the guide slot is circumferential, so that, upon rotation of the sleeve between limits, the slots in effect go from an obturating position to an open position without axial movement of the sleeve. Alternatively, the obturating slots may be circumferential while the guide slot is angularly disposed, so that rotation of the sleeve is accompanied by an axial displacement thereof by substantially the width of the obturating slots. In this case the coupling is by means of a pin and slot connection to provide for the necessary axial movement.

Inventors

  • 👤 R Schmid
  • 👤 D Selke
  • 👤 L Tekulve

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 18:50
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/48

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 230 words
A linear decelerator comprising a cylinder, and a piston reciprocable therein, said cylinder containing hydraulic fluid ahead of said piston, a rotatable sleeve surrounding said cylinder, a number of apertures in said cylinder, exponentially spaced along a generatrix of said cylinder, a number of obturation slots in said sleeve equal to the number of said apertures and exponentially spaced along a generatrix of said sleeve, the axial extent of each of said apertures being substantially equal and the axial extent of said obturation slots being at least as great as that of the respective apertures, there being an obturation slot for each aperture, a reservoir tube surrounding said sleeves in annularly spaced relation thereto, means coupling said sleeve to said reservoir tube so as to be rotatable by rotation of said reservoir tube, a guide slot in said sleeve and a pin secured to said cylinder and engaging in said guide slot to limit the rotational movement of said sleeve to the circumferential length of said obturation slots, rotational movement of said sleeve producing an axial displacement of the obturation slots with respect to their respective apertures; said obturation slots at one limit of rotation of said sleeve obturating said apertures, and at the other limit of rotation of said sleeve fully opening said apertures, whereby the action of said decelerator may be adjusted by rotation of said reservoir tube.
Claim 2
Dependent Claim 230 words
A linear decelerator comprising a cylinder, and a piston reciprocable therein, said cylinder containing hydraulic fluid ahead of said piston, a rotatable sleeve surrounding said cylinder, a number of apertures in said cylinder, exponentially spaced along a generatrix of said cylinder, a number of obturation slots in said sleeve equal to the number of said apertures and exponentially spaced along a generatrix of said sleeve, the axial extent of each of said apertures being substantially equal and the axial extent of said obturation slots being at least as great as that of the respective apertures, there being an obturation slot for each aperture, a reservoir tube surrounding said sleeves in annularly spaced relation thereto, means coupling said sleeve to said reservoir tube so as to be rotatable by rotation of said reservoir tube, a guide slot in said sleeve and a pin secured to said cylinder and engaging in said guide slot to limit the rotational movement of said sleeve to the circumferential length of said obturation slots, rotational movement of said sleeve producing an axial displacement of the obturation slots with respect to their respective apertures; said obturation slots at one limit of rotation of said sleeve obturating said apertures, and at the other limit of rotation of said sleeve fully opening said apertures, whereby the action of said decelerator may be adjusted by rotation of said reservoir tube.
Claim 3
Dependent Claim 56 words
The structure of claim 1, wherein said obturation slots are disposed parallel to each other and at an angle to the circumference of said sleeve, and said guide slot is circumferentially disposed, whereby rotation of said sleeve is circumferential without axial displacement, and obturation is obtained by virtue of the angular disposition of said obturation slots.
Claim 4
Dependent Claim 44 words
The structure of claim 1, wherein said obturation slots are disposed circumferentially, and said guide slot is disposed at aN angle to the circumference of said sleeve, whereby rotation of said sleeve is accompanied by axial displacement thereof to produce obturation of said apertures.
Claim 5
Dependent Claim 65 words
The structure of claim 3, wherein the coupling between said sleeve and reservoir tube comprises a pin fixed with respect to said reservoir tube, said pin cooperating with an axial slot in said sleeve, said axial slot having a width to snugly accommodate said pin, and a length sufficient for axial movement of said sleeve between obturating and fully open positions of said obturation slots.
Claim 6
Dependent Claim 38 words
The structure of claim 1, wherein a nitrogen filled, closed cell, cellular member is disposed within said reservoir tube and surrounding said sleeve except over the circumferential extent of said obturation slots, to serve as an internal accumulator.
Claim 7
Dependent Claim 55 words
The structure of claim 5, wherein a thin sheet metal shield is provided to protect said internal accumulator from hydraulic fluid jets and turbulence, said shield being of substantially the axial length of said accumulator, being disposed between said accumulator and said sleeve, and having flange portions extending around the circumferential ends of said accumulator.

References Cited (Backward Citations)

US3339910A Cited
US3647199A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-31 1977-07-02 1978-01-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-31 1981-07-02 1982-01-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-31 1985-07-02 1986-01-01 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag