Fluid-operated vise

Claim 2

A fluid-actuated vise comprising a base member having a fixed jaw, a body secured to said base member and having a pair of parallel cylinders formed therein, a plunger slideably mounted in each of said cylinders and having a front plate rigidly secured to and between one of their ends, fluid passage means extending into said cylinders whereby pressure fluid acts to extend said plungers and front plate toward saId fixed jaw, a bearing stop ring threadably engaged in each of said cylinders and forming a bearing for said plungers, said plungers each having an integral stop formed around the outer periphery thereof for abutment with their respective stop rings when said plungers have been extended a predetermined amount, a tension spring connected to said plungers and having a hook at the other end extending into said passage means in said body, and a rod in said passage means extending through said hooks, whereby said spring on release of fluid pressure in said cylinders retracts said plungers and front plate.

Claim 3

A fluid-actuated vise comprising a base member having a fixed jaw, a body secured to said base member and having a pair of parallel cylinders formed therein, a plunger slideably mounted in each of said cylinders, a front plate rigidly secured to one end of said plungers, a fluid passage in said body adjacent the cylinders and being connected to said cylinders whereby fluid under pressure in said passage acts to extend said plungers and front plate toward said fixed jaw, a bearing stop ring in each of said cylinders and forming a bearing for said plungers, said plungers having a reduced diametrical portion for sliding engagement with said stop rings and also an enlarged diametrical portion adjacent the rear end thereof for sliding engagement with the interior of said cylinders, a tension spring located in and connected to each of said plungers and having a hook at the other end extending into said passage, and a rod in said passage connected to the hook on each of said springs adjacent the rearward portion thereof, whereby said spring on release of pressure within said passage retracts said plungers and front plate.

Claim 4

A fluid-actuated vise comprising a base member having a fixed jaw, a body secured to said base member and having a pair of parallel cylinders formed therein, a plunger slideably mounted in each of said cylinders, a front plate rigidly secured to one end of said plungers, a fluid passage in said body adjacent the cylinders and being connected to said cylinders whereby fluid under pressure in said passage acts to extend said plungers and front plate toward said fixed jaw, a bearing stop ring in each of said cylinders and forming a bearing for said plungers, said plungers having a reduced diametrical portion for sliding engagement with said stop rings and also an enlarged diametrical portion adjacent the rear end thereof for sliding engagement with the interior of said cylinders, a tension spring located in and connected to each of said plungers and having a hook at the other end extending into said passage, and a rod in said passage connected to the hook on each of said springs adjacent the rearward portion thereof, whereby said spring on release of pressure within said passage retracts said plungers and front plate.

Claim 5

A fluid-actuated vise comprising a base member having a fixed jaw, a body secured to said base member and having a pair of parallel cylinders formed therein, a plunger slideably mounted in each of said cylinders and having one end extending from one end of said cylinders and a bore in the other end of said plunger, bearing means mounted in the end of each cylinder for retaining said plunger in said cylinder, a front plate rigidly secured to and between the said one end of said plungers, the other ends of said plungers being unconnected with one another, a fluid passage in said body and in communication with said cylinders whereby pressure fluid acts to pressurize said cylinders and extend said plungers and front plate toward said fixed jaw, and spring means located in said the bore of each of said plungers and having a connection with each of said plungers adjacent the forward portion thereof, and a rod in said passage connected to the spring means in each of said plungers, whereby said spring means is elongated on admission of fluid under pressure to said passage and retracts said plungers and front plate on release of pressure in said passage.

Claim 6

A fluid-actuated vise comprising a base member having a fixed jaw, a body secured to said base member and having a pair of parallel cylinders formed therein, a plunger slideably mounted in each of said cylinders and having one end extending from one end of said cylinders and a bore in the other end of said plunger, bearing means mounted in the end of each cylinder for retaining said plunger in said cylinder, a front plate rigidly secured to and between the said one end of said plungers, the other ends of said plungers being unconnected with one another, a fluid passage in said body and in communication with said cylinders whereby pressure fluid acts to pressurize said cylinders and extend said plungers and front plate toward said fixed jaw, and spring means located in said the bore of each of said plungers and having a connection with each of said plungers adjacent the forward portion thereof, and a rod in said passage connected to the spring means in each of said plungers, whereby said spring means is elongated on admission of fluid under pressure to said passage and retracts said plungers and front plate on release of pressure in said passage.

Claim 7

The vise described in claim 3 wherein said bearing means comprises a bearing stop ring threadably engaged in each of said cylinders and forming a bearing for said plungers, said plungers each having a stop formed around the periphery thereof for abutment with their respective stop rings when said plungers have been extended a predetermined amount.

Claim 8

The vise as claimed in claim 4 further characterized in that said plungers have a reduced diametrical portion for engagement with said stop rings and also an enlarged diametrical portion adjacent the rear end thereof for engagement with the interior of said cylinders.