SU949262A1 - Ratchet-and-pawl mechanism - Google Patents

Description

(54) TYPICAL MECHANISM

. one

The invention relates to general engineering and can be used as a stepper lift-down mechanism.

A ratchet mechanism is known, comprising a housing, a drive shaft with a ratchet wheel, a working and locking pawl, interacting with the ratchet wheel, and a leash associated with the locking pawl spring 1.

The disadvantage of this design is the fixing of the ratchet wheel in one direction only.

The closest in technical essence and the achieved result to the invention is a ratchet mechanism comprising a housing, a drive shaft with ratchet wheels rigidly fixed thereto with oppositely directed teeth, a leash, workers and locking dogs interacting with the wheels and one of the locking dogs zana with a leash.

The second locking dog is connected to the second leash of mehaiism. Work tanks are located on the rod-ax drive devices - hydraulic cylinders 2.

The disadvantage of this mechanism is the absence in the operating mode of fixation of the drive shaft from an external load torque directed in the same direction as the active dog.

five

The purpose of the invention is to provide the possibility of rotation of the drive shaft in one direction, regardless of the direction of the effect of the load torque.

Claims (2)

10 The goal is achieved by the fact that in a ratchet mechanism comprising a housing, a drive shaft with ratchet wheels fixed with a counter-directed teeth, a leash, workers and locking dogs interacting with scaffolds, and one of the locking dogs is connected with a leash, working dogs are placed on a leash and directed in different directions, the second locking dog is placed on. the casing, and the mechanism is provided with a copier fixed on one of the working dogs, a shtanga interacting with it, on which is placed the first locking pawl, and connecting the latter with a spring compression spring - tension. The drawing shows a ratchet mechanism. The ratchet mechanism includes a housing, a drive shaft 2 with ratchet wheels 3 and 4 fixed on it, a leash 5 with a working pawl 6 placed on it, equipped with a copier 7 and a spring 8 pushed off the ratchet wheel 4 coaxially and oppositely to the dog 6 on the leash 5 a second working dog 9 is placed, pressed against the ratchet wheel 3 by a spring 10. The first locking dog 11 is placed on the bar 12 and is connected to the leash 5 by a compression spring 13. The second locking pawl 14 is located on the housing 1. The ratchet mechanism operates as follows. When the driver 5 moves in the direction indicated by the arrow in the drawing, the spring 13 expands and holds the locking pawl 11 in engagement with the ratchet wheel 4. The pawl 6 tends to tilt out of the bottom of the wheel 4 under the influence of the spring 8. With the further movement of the leash 5 by the amount needed for free exit of the pawl 6, the wheel 4 is held by the locking pawl 11. The pawl 6 is disengaged from the ratchet wheel 4 by the spring 8. When the leash 5 moves in the opposite direction counterclockwise relative to the fixed shaft 2 and the ratchet wheel 4 stretched earlier, the spring 13 is compressed and tends to push the pawl 11 out of engagement with the ratchet wheel 4, which is hampered by the torque on the shaft 2. The pawl 6 engages with the ratchet 4 when copier 7 interacts with the strap 12. Ratchet wheel 4, pawl 6 with a cam 7 and the leash 5 together with the shaft 2 rotate by the amount required for free exit of the pawl 11 from the counterclockwise engagement, while the spring 13 is compressed pushes the pawl 11 from the ratchet 4. The leash 5 There is a reverse movement, with the dog b engaged with the ratchet wheel 4 and the shaft 2 rotate clockwise to the required angle, the spring 13 pulls in and engages the dog 11 with the next tooth of the ratchet wheel 4, then the cycle repeats. In the absence of torque, or when it acts on the shaft counterclockwise, it is rotated in a clockwise direction with the help of the ratchet wheel 3 and the dogs 9 and 14 according to the usual ratchet mechanism. The proposed mechanism will improve the existing lifting and lowering loading and unloading mechanisms. Claims of the invention: A ratchet mechanism comprising a housing, a drive shaft with ratchet wheels rigidly fixed thereto with oppositely directed teeth, a leash, workers and locking paws interacting with the wheels, and one of the locking paws is associated with a leash characterized in that in order to allow the drive shaft to rotate in one direction regardless of the direction of the load moment acting on it, the working dogs are placed on the leash and directed in different directions, the second locking dog is placed on the body, and the mechanism is equipped with a cam mounted on one of the working dogs, a rod interacting with it, on which is placed the first locking dog, and connecting the latter with a spring compression strut. Sources of information taken into account in the examination 1. Kozhevnikov S. N. Mechanisms. M., “Mechanical Engineering, 1976, p. 445-446, mechanism 7.19. 2. USSR author's certificate number 229147, cl. F 16 H 29/02, 1969 (prototype).