SU1237409A1 - Head for wood screw driving tool - Google Patents

Description

I 1

The invention relates to a mechanized tool and can be used to tighten screws having a cross-shaped slot.

The purpose of the invention is the expansion of technological capabilities by ensuring that during the operation of the head, when the maximum tightening torque is reached, automatic retraction of the tool.

The drawing shows the head of the screwdriver device, a longitudinal section.

The screwdriver head comprises a housing 1, a drive 2 and a spindle 3 housed therein. A spindle 3 is connected to a drive 2 via a torque limit coupling consisting of a driving 4 and a driven 5 half couplings made with identical centers 6 and 7 which are turned relative to each other at an angle about equal to half the central angle between adjacent faces or arcs forming a hole through the central hole. The driving half coupling 4 is made with longitudinal channels 8 in which the balls 9 are placed, spring-loaded with springs 10 and interacting with face cams 11 of the driven coupling half 5. The force of the springs 19 is adjusted by a nut 1 2

Coaxially pin 3 in the case is installed nozzle 13, which podr-supper in the direction of the free end of the spindle 3 by the spring 14.

The spindle 3 is made with a profile shank 15, a reciprocal central profile of the driven and driving half coupling 4 and 5. The shank 15 is placed with the possibility of axial movement in the central profile hole 7 of the driven coupling 5. The spindle 3 is spring-loaded axially relative to the nozzle 13 by the spring 16 , has a cartridge 7 at the free end, designed to secure the working tool 18, and its middle part is rotatably mounted in a slider 19. The slider 19 is mounted axially displaced in the housing 1 ., Which is limited to the stopper 20. The end of the stopper 21 is rigidly secured in the

VNIIPI Order 3236/16 Circulation 1031 Subscription Proizv.-poly. pr-tie8 Uzhgorod, st. Project, 4

374092

the slider 19, and its middle part is located in the longitudinal hole 21 of the housing 1.

The nozzle 13 is complete with a longitudinal

5 with a groove 22 covering the stop 20 and a tapered guide 23 intended to orient the head of the screw to be turned on (not shown) with respect to the end of the working tool 18.

. The head works as follows.

Drive 2 is turned on and

15 feed .heads in the direction of the screw (not shown). The rotation from the drive 2 through the longitudinal coupling sleeve is transmitted to the spindle 3 and further to the working tool 18, fixed

20 in the chuck 17. In the process of lowering the head, its nozzle 13 contacts the head of the screw to be screwed and the taper guide 23 orients the latter relative to the end

25 working tools, for example, a four-sided blade. As the head further descends, the nozzle 3 compresses the springs 14 and 16, and the end of the working tool 18 engages with the slots of the wrapped screw, which begins to rotate; in conjunction with spindle 3. As the screw is tightened, the resistance in the tightened threaded connection begins to increase. When a predetermined limiting moment is reached, which is determined by the force of the pre-compressed springs 10, the coupling half 4 slides relative to the driven weight 5, while the profile hole 6 is aligned with the profile hole 7 of the driven coupling half 5. At this moment the shank 1-5 spindle 3 comes in into the profile hole 6 of the leading coupling half 4, and the working tool moves away from the screw head, which indicates the end of tightening of the threaded connection.

The head is then retracted from the tightened threaded joint and moved to the next screw. The cycle then repeats in the sequence described.

Claims (1)

HEAD FOR A DRILLING DEVICE, comprising a housing, a drive placed therein, a spindle, a torque limit coupling connecting the spindle to the drive, and a nozzle coaxially mounted relative to the spindle, axially spring-loaded towards the free end of the spindle, characterized in that, for the purpose of expanding technological capabilities, the leading and driven half-couplings of the maximum torque are made with identical central profile holes and are rotated relative to each other at an angle of about half not the central angle between adjacent faces or arcs forming the profile of the Central hole, the spindle is axially spring loaded relative to the nozzle and is made with a profile end, which is placed in the profile hole of the driven coupling half with the possibility of axial movement.