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1069results about "Counterweights" patented technology

Apparatus for covering an opening in a building

A storm protector (20) to be attachable over a window (21) or other opening of a building (22) includes a header (26), a bottom sill (25) and side frames (23, 24) extending between the ends of the header (26) and the sill (25). The header (26) carries a tube (53) which has one end of a curtain assembly (27) attached thereto. The curtain assembly (27)is biased by a spring (54) to be normally coiled on the tube (53), but the curtain assembly (27) may be manually moved along the frames (23, 24) to the sill (25) to cover the window opening (21). A bar (31) is formed at the other end of the curtain assembly (27), and the bar (31) carries a guide and lock assembly (110) which rides in and can engage at least one of the side frames (23, 24) to guide and selectively hold the curtain assembly (27) at any selected position along the side frames (23, 24). A tensioning assembly (32) is positioned in the header (26) and, without disassembling the protector (20), it may be accessed to adjust the tension of the spring (54). The header (26) includes a sealing surface (50), the sill (25) includes a sealing surface (105) and each side frame (23, 24) includes a sealing surface (89). A force upon the curtain assembly (27) causes it to engage the sealing surfaces (50, 89, 105) to provide a full perimeter seal around the window opening (21).
Owner:OVERHEAD DOOR

Braking device for garage doors and the like

InactiveUS6986378B2Impede free fallingDamages to injuriesDoor/window protective devicesBuilding braking devicesEngineeringFlange
A braking device configured for use with the counterbalancing system of a garage door. The braking device includes a support bracket, a ratchet wheel, a pawl arm, and a biasing spring. The support bracket is rigidly connected to a fixed structure and has a guiding slot. The ratchet wheel is securely mounted about the overhead shaft of the counterbalancing system and has at least one notch. The pawl arm has first and second ends, the first end of the pawl arm being pivotally connected to the support bracket and the second end of the pawl arm cooperating with the guiding slot and being movable with respect to the support bracket along said guiding slot. The first and second ends of the pawl arm are further connected to flanges of a plug on either side of the overhead shaft. The biasing spring is operatively connected between the support bracket and the pawl arm so as to exert a biasing force for biasing the pawl arm towards the ratchet wheel. The pawl arm is devised so that, an element thereof is adjacent to the ratchet wheel, said element being shaped and sized to be removably insertable into at least one notch of the ratchet wheel so as to block rotation of the ratchet wheel, and thus block rotation of the overhead shaft, in the event of a failure of the counterbalancing system of the door.
Owner:CANIMEX

Multiple eccentric shaft processing method and using counterbalance and eccentric sleeve

The invention discloses a processing method of multiple eccentric shaft; lengthened ends are arranged on both ends of the multiple eccentric shaft; after that a counterbalance is arranged at the position of eccentric crosspiece, and a reference crosspiece is processed, then counterbalance is dismounted; a eccentric sleeve is arranged at the lengthened end, and an eccentric crosspiece is processed; finally the lengthened end of the multiple eccentric shaft is removed, and a multiple eccentric shaft is obtained. The invention also discloses the counterbalance use in the method, comprising a balance section and a fixation section; the balance section and the fixation section can clasp the eccentric crosspiece after being installed. The invention also disclosed the eccentric sleeve use in the method, comprising a lengthened end hole and a processing hole; the axial line of the lengthened end hole is in parallel with the axial line of the processing hole, the eccentric crosspiece is processed by taking the axial line of the eccentric crosspiece as the processing axial line. The counterbalance and the eccentric sleeve provided by the invention has simple structure, and is easy to make; and relative high precision can be easily achieved; the processing method of the multiple eccentric shaft of the invention has simple steps, and the multiple eccentric shaft with relative high precision can be made with convenience and rapidness.
Owner:SHANGHAI JIANSHE LUQIAO MASCH CO LTD

Automatic leveling device and leveling method of high-precision upright air-floating rotary platform

ActiveCN104848989AMicro-disturbanceSolve the problem that affects the disturbance torque index of the turntableStatic/dynamic balance measurementCounterweightsGravity centerEngineering
The invention discloses an automatic leveling device and a leveling method of a high-precision upright air-floating rotary platform, belongs to the technical field of rotary platform leveling, and aims to solve the problem that the interference moment index of a rotary platform can be affected as the gravity center of an upright air-floating rotary platform rotating component deviates from a rotation axis. An effective load is fixedly connected with a load mounting disc of the device; an air-floating shaft is connected with the lower surface of the load mounting disc; the air-floating shaft is correspondingly arranged in the center of the upper surface of an air-floating rotary platform main body; the bottom surface of the air-floating rotary platform main body is fixedly connected with an air-floating rotary platform base; the air-floating rotary platform base is supported by using an air-floating rotary platform height adjusting support; an x-axis leveling motor and a y-axis leveling motor are used for leveling the device by adjusting corresponding counterweight blocks. According to the leveling method, by adjusting one air-floating rotary platform height adjusting support, the corresponding position of the load mounting disc is the lowest point in a horizontal direction, a present rotary platform inclination angle can be measured, the straight line position of the present gravity center of the load mounting disc can be measured, and the moving distance of the counterweight block can be further obtained. The automatic leveling device and the leveling method are applied to automatic leveling of the rotary platform.
Owner:HARBIN INST OF TECH

Passive/active-selectable cantilever type dynamic vibration absorber

The purpose of the invention is to provide a passive/active-selectable cantilever type dynamic vibration absorber, which comprises an overall base, a step motor, a gear shaft, baffles and a mass block, a driven gear is fixed on the gear shaft, a front bearing base, a rear bearing base and the step motor are fixed on the overall base, a front bearing and a rear bearing are respectively mounted on the front bearing base and the rear bearing base, the gear shaft passes through the front bearing base and the rear bearing base and is respectively fitted in the front bearing and the rear bearing, the driven gear is located between the front bearing base and the rear bearing base, the output end of the step motor is connected with a driving gear, the driving gear is engaged with the driven gear, the overall base is fixed between the two baffles, the gear shaft is provided with an external thread, the center of the mass block is provided with a hole, the wall of the hole is provided with an internal thread which is matched with the external thread of the gear shaft, and the mass block is mounted on the external thread of the gear shaft through the internal thread. The passive/active-selectable cantilever type dynamic vibration absorber is structurally simple and highly reliable and can better meet the requirement for vibration absorption under different conditions.
Owner:HARBIN ENG UNIV
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