The pressure in the downstream side of a pneumatic cylinder's piston (1 g ) is allowed to exhaust. At a certain point, the downstream exhaust is blocked, causing the pressure to rise against the downstream side of the piston. A valve opens when the downstream chamber has reached its maximum pressure. The output of valve …

Legal parties

Inventors (applicants): John C. A. Burhoe

The application was examined by Michael Leslie (USPTO dept. 3745)


  • 1. A method for cushioning the deceleration of a piston in an expandable chamber motor …
  • 2. The method of claim 1 further including: …
  • 3. The method of claim 2 further including changing an inactive volume of said downstream …

Cited documents


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FIG. 1 is a high level logic schematic of the cushioning cartridge, with a typical single rod, double acting, pneumatic cylinder. FIG. 2 is a cross-sectional view of the pneumatic …



Fluid powered, expandable chamber motors are used to apply a force along a straight line. These motors are usually known as either pneumatic or hydraulic cylinders. Pneumatic cylinders are powered …

Reference Numerals

1 pneumatic cylinder 1a cap end chamber …

Detailed Description

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the body of a typical, single rod, double acting, pneumatic cylinder 1 consists of three main components: the head …

More details about Pressure Unloading Valve to Cushion a Pneumatic Cylinder

Miscellaneous patent data

Includes the following drawings: Cross-sectional view of the pneumatic, Pressure Unloading Valve to Cushion, Cross-sectional view of the pneumatic, High level logic schematic of the cushioning, the invention description is illustrated by 8 drawings, the grant publication number is 08578837, 10 figures depict the invention details, developed by John C. A. Burhoe, was examined by 3745 USPTO department, the examiner - Michael Leslie, the applicant's location - Fairlawn, OH, the known applicant's name is John C. A. Burhoe, the application publication date is May. 12, 2010, the patent was granted on Nov. 12, 2013, the protection scope is defined by 11 claims, numbered 12/800,304 (application), the patent particularly claims a method for cushioning the deceleration of a piston in an expandable chamber…, similar classification categories are Piston carries separate inlet and exhaust valves, flexible separating means, Adjustable cam or cam follower actuated inlet valve, Motive fluid build-up at end of working stroke reverses distributor, restricting the stroke, providing distinct intermediate positions, with step-by-step action, Special measures for feedback, Extension of Unit Having Separately Controlled Working Chambers Equals Sum of Individual Chamber Extensions, only one servomotor, Valve controlled by remote means, categorized under Throttling as a primary classification, the invention is named Pressure Unloading Valve to Cushion a Pneumatic Cylinder, the inventor's address - Fairlawn, OH, the inventor's name is John C. A. Burhoe, the claims number 1 and 5 are selected as exemplary, the patent extension term is 854 days.

Invention classification information

The invention is classified under for accelerating or decelerating the stroke, Throttling, Pilot valve (304), for use with a single servomotor. The designated search classifications include Part movable with respect to working member, Throttling, Working member carries part within working chamber which controls port in chamber end wall, Exhaust valve with bleed passage therein, By successively controlling or controlling less than all of plural exhaust passages, Exhaust control, Pilot valve (304).

Patent details
Publication number 08578837
Publication date Nov. 12, 2013
Kind code B1
Application number 12/800,304
Application date May. 12, 2010
Application type U
Application series code 12
Extension term 854
National classification 91/405
Total number of claims 11
Exemplary claims 1, 5
Number of drawings 8
Number of figures 10
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