Screen tensioning apparatus |
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| 申请号 | US41922373 | 申请日 | 1973-11-26 | 公开(公告)号 | US3865154A | 公开(公告)日 | 1975-02-11 |
| 申请人 | GLOBE UNION INC; | 发明人 | COX ROGER DOUGLAS; MICHAELS WALTER BERNARD; | ||||
| 摘要 | An apparatus for applying a screening material in a frame structure wherein the tensioning of the screen as it is secured in the frame can be accurately determined and the screening material placed in the frame member in a consistent manner over long periods of operation. The screening device employs freely moving or ''''floating'''' clamp members which are placed under constant tension. The clamp members hold a screening material in four different directions and maintain the constant tension on the screen as it is forced into grooves in the frame member. The floating clamp members serve to maintain the desired tension at all times in that as the screening material is forced into channels in the frame by means of rods, the clamp members will move in the direction that the screen is being pulled while at all times maintaining the desired tension on the screen as it is press fitted into the channels. In a preferred manner, movable weights serve as the tensioning means and hydraulicly operated piston rods are utilized as part of the floating clamp means which hold the screening material between bar and stationary wall members. | ||||||
| 权利要求 | 1. An apparatus for mounting a screening material in a frame member comprising supporting and driving means for at least one securing member, said supporting and driving means including means to support said securing member in one position and drive it to another position relative to said frame so as to engage said frame member, freely movable clamp means operatively associated with said supporting and driving means to hold said screening material across said frame member and said securing member, and constant force tensioning means operatively associated with said clamp means to permit free movement of said clamp means in opposing directions and to hold said screening material under constant and uniform tension when said screening material is secured in said frame member. 2. The apparatus as defined in claim 1 wherein said securing member is a plastically deformable rod and said frame member includes a channel for engagement by said rod when forced therein by said driving means. 3. The apparatus as defined in claim 2 wherein said clamp means are comprised of a stationary wall member and a block member, a two-way hydraulic piston rod connected to said block member, said block member actuated by said piston rod for clamping said screening material between said stationary wall member and said block member. 4. The apparatus as defined in claim 2 wherein said channeled frame is four-sided and said clamp means comprise four individual means. 5. The apparatus as defined in claim 2 wherein said rod has a hollow core and said screening material is composed oF stainless steel. 6. The apparatus as defined in claim 2 wherein said screening material is generally rectangular, said clamp means comprising first and second pairs of clamp plates arranged on opposite sides of said supporting and driving means for engaging said screening material. 7. The apparatus as defined in claim 2 wherein said clamp means includes relatively movable clamping surfaces and bidirectionally movable cylinder means for selectively clamping and releasing said screening material between said clamping surfaces. 8. The apparatus as defined in claim 7 including a support surface for said movable base and said clamp means, said clamp means being freely slidable on said support means, and guide means affixed to said support means for guiding the motion of said clamp means. 9. The apparatus as defined in claim 2 wherein said supporting and driving means for said rod includes a movable base member, a channel in said movable support, a fixed support communicating with said channel and a driving member oppositely disposed from said movable base member to contact said frame and force said rod into said channel in said frame with said screening material sandwiched therebetween. 10. The apparatus as defined in claim 9 wherein said movable base is supported by spring means and guide rods. 11. The apparatus as defined in claim 9 wherein said fixed support communicating with said channel comprises a stationary punch member. 12. The apparatus as defined in claim 9 further including a support surface for said movable base and said clamp means is slidably positioned upon said support surface. 13. The apparatus as defined in claim 12 wherein said tensioning means comprise weighted cables attached to said clamp means and supported over pulleys. |
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