SU722753A2 - Head for screw-fastening tool - Google Patents

Description

The invention will relate to mechanized devices for screwing in the manufacture of wood containers and other tableware with metal fittings. A known head for a screwdriving device, comprising a housing, a feeder a screwdriver with a drive mechanism, a telescopic sleeve with a safety device made in the form of spring-loaded segment jaws with a spherical apex on the axes, forming a cone with a variable angle at the apex 1. with a standard sharpening, the spring-loaded segment jaws are diluted first with the threaded part of the screw and then at the end of the wrapping with the screw head. When the screw head extends beyond the centering jaws, under the action of springs, they close and come into contact with the face of the feather, which alternately squeeze the jaws, acting on their lateral segmented surfaces at a large angle of attack. From frequent recurring impacts of the screwdriver on the jaws, the working screwdriver's pen perceives also a significant vibration-dynamic load, which contributes to premature wear of the screwdriver's pen and centering jaws, which do not squeeze on the contacting surfaces of the sponge and, as a result, there is a breakdown of the screwdriver or centering jaws. The aim of the invention is to eliminate the breakage of the tool and the centering elements due to the contact of the screwdriver's pen with the side surface of the jaws. This is achieved by the fact that the working end of the screwdriver is made in the entrance of a truncated cone with flats at the end forming a feather equal in height to 1.1-2 depth of the screw slot, and the angle of taper of the screwdriver is greater than the maximum cone of the jaws. The drawing shows a head for a screwdriver, general view.

The head consists of a telescopic sleeve 1, sliding along the cylindrical surface of the body 2, catcher 3, placed on the telescopic sleeve 1, fitted at the end with centering spring-loaded jaws 4 fixed to the axles 5. The body has a central channel 6 for passing a screwdriver 7 and placing the sashur and a side channel 7 with a tubular feeder 8, through which another screw is fed.

The head works as follows.

The telescopic sleeve 1 is shifted by hand (vertically manually downward). Its upper part slides along the cylindrical surface of the housing 2. The safety device 3 with its conical surface formed by closed segment jaws 4 is guided towards the hole and the spherical tip is self-aligning in it, providing the head with respect to the center of the reinforcement hole.

From the actuators along the side channel with the tubular feeder 8, the next screw is fed into the central channel 6, then the working stroke of the screwdriver 7 occurs, which with its working pen captures the slot of the screw and rotates it while simultaneously moving vertically downwards.

The entry part of the schruup expands the segment jaws 4, rotates around the axes 5, ensuring the free passage of the schruup into the hole of the reinforcement and its screwing into the wood.

In the process of screwing the screw (not shown) into the wood, its head extends beyond the centering jaws 4, which, closing, begin to contact

with their work surfaces with a truncated conical part of the screwdriver.

The working part of the screwdriver is a pen, in this case it is not in contact with the centering jaws, therefore the screwdriver does not experience additional vibration-dynamic loads.

If the screw is absent during the screwing operation, the work is idle, the screwdriver goes through the centering jaws, smoothly moving them apart, with its truncated conical part on the jaws, without touching them with a working pen.

The execution of the working part - the feather bite of the described construction will ensure a smooth movement of the tool through the centering jaws, eliminate vibration and dynamic loads, and breakage of the pen and centering jaws.

Claims (1)

Invention Formula Head for screwdriving device according to avt.S. No. 286623, characterized in that, in order to eliminate the breakage of the tool and the centrifugal elements due to the contact of the screwdriver's pen with the side surface of the jaws, the working end of the screwdriver is made in the form of a truncated cone with flats at the end forming a feather equal in height to 1.1- 2 depths of the screw ishitsa, and the angle of taper of the screwdriver is greater than the maximum cone angle of the jaws. Sources of information taken into account in the examination. USSR author's certificate number 286623, cl. B 25 B 21/00, 1969 (prototype).