US3038701A

US3038701A - Nail extracting machine

Info

Publication number: US3038701A
Application number: US778533A
Authority: US
Inventors: Sainio Rainer Lannart
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-12-05
Filing date: 1958-12-05
Publication date: 1962-06-12
Anticipated expiration: 1979-06-12

Description

June 12, 1962 R. L. SAlNlO I -NAIL EXTRACTING MACHINE Filed Dec. 5, 1958 v INVENTOR 'RAINER LANNART SAINIO FIG.5

ATTORNEY United States Patent Ofifice 3,838,781 Patented June 12, 1962 3,038,701 NAIL EXTRACTING MACHINE Rainer Lannart Sainio, Oksasenkatu 1, Lappeenranta, Finland Filed Dec. 5, 1958, Ser. No. 778,533 2 Claims. (Cl. 254-18) This invention relates to machines for extracting nails. The removing of nails by hand from used boards has always been considered to be a very ditlicult, costly and tedious operation. The invention has as an object the provision of an improved machine whereby nails may be most easily extracted.

According to this invention, a nail extracting machine is provided with two gripping jaws which are made to move upwards and downwards, one of the said gripping jaws being secured to a slider with reciprocating motion while the other one of the jaws is turna-bly mounted to the said slider.

A feature of this invention is that, for pressing together the jaws and for pulling down the slider and the means secured to it there is provided a pressing rod or toggle, an end of which is provided with a rounded cam surface pivotally mounted on said slider. The pressing rod is also pivotally coupled to a connecting rod by which the pressing rod, during the downward movement of the connecting rod, will first press the extracting jaws against another, while the said rounded cam surface of the pressing rod causes the slider to be pulled downwards thereby also forcing the pressing rod to move downwards.

The construction of the machine can be understood from the accompanying drawing, in which:

FIGURE 1 is a front view of the machine,

FIGURE 2 is a sid view of the machine of FIG. 1, and

FIGURE 3 is a sectional view of the top part of the machine, on enlarged scale, the jaws being in their top position just before closing.

The nail to be extracted is placed between jaws 18. The nail can be in any position, provided only that it projects slightly from the surface of the board (about 3 to 4 mm). The mechanism of the machine first forces the clamping jaws to close firmly around the nail and thereafter drags the nail out head first or point first. When the nail is gripped between the jaws 18, the connecting rod or lever 4, with the aid of the crank shaft 3 and the toggle or pressing rod 10, operates to clamp the jaws together. Simultaneously a member 7 prevents the slider 8 from moving downwards before the jaws 18 have properly gripped the nail. Thereafter the slider is pulled downwards by the crank shaft and brings the extracted nail with it. When the slider has reached its lowest position, the jaws are opened immediately after the crank shaft starts to move upwards, by the action of a lug 14 and a jaw opening spring 12 working in cooperation with the pressing rod 16. The position of the pressing rod allows the jaws to be open during their upward motion, whereby sufiicient time is given for positioning the nail between the jaws.

The base of the nail extracting machin consists of a structural steel framework 1 on which are mounted a power source 15 consisting of an electric motor or an internal combustion engine, reduction means 20 consisting of a suitable toothed wheel gearing or worm gearing, and the frame 2 of the machine. The rotation is converted into a reciprocatory movement by means of the connecting rod 4 and the crank 3, and the slider 8 moves up and down in the track formed by the frame 2 and guide 16. When the connecting rod moves upwards, it first forces the toggle l8 upwards at an inclination and the spring 12, of the jaw mechanism releases the thus pivotal member 9 to which one of the jaws 18 is secured, thus producing a gap of about 15-20 mm. between the two jaws. In the following work ing phase, the toggl 1d pulls the whole movable slider into its topmost position by means of the lug 14. In this phase, the slider is supported by the stop member 7 secured to the springs 6 and the spring securing means 5. Springs 6 are stronger than spring 12 so that the latter spring yields and permits toggle 10 to urge the jaws together. Thus, when th connecting rod starts to pull downwards again, the pressing rod 10 is pivoted into a horizontal position so that it clamps the nail between the jaws 18. In the following phase, the slider moves downwards overcoming members 7 and springs 6 so that the jaws drag the nail out. The jaws drop the nail when the movement of the slider changes and the jaws open, letting the nail fall through an outlet opening 17 in the frame 2 and further into a collecting container. During this movement, the member 7 turns upwards to an inclined position, thus allowing the slider to pass. A bracket 11 serves as a support for the board while the nails are being introduced between the jaws.

What is claimed is:

1. A nail extracting machin comprising a guide, a slider slidable along said guide, cooperating jaws on said slider, at least one of said jaws being pivotal on said slider whereby a nail can be grasped and released by said jaws, a toggle pivoted on said slider and including a cam portion adjacent the pivotal jaw for pivoting the latter towards the other of the jaws, a spring on said slider and coupled to the pivotal jaw for urging the same away from the other jaw, a member pivoted to said guid and engaging said slider, with the slider at a first position on said guide, for supporting the slider, a spring loading said member whereby the latter yieldingly engages said slider, the latter said spring being stronger than the first said spring to provide for operation of said jaws by said toggle, a lever pivotally connected to said toggle, and means to reciprocate said lever along said guide, said means displacing said lever in one direction along said guide until said slider is at said first position and engaged by said member, said means then reversing the direction of displacement of said lever firstly to pivot said toggle against the action of the weaker spring and urge said cam portion against the pivotal jaw and secondly to pull said slider past said member against the action of the stronger spring to complete a working cycle.

2. A machine as claimed in claim 1 comprising a lug on said slider limiting pivotal movement of said toggle.

References (Iited in the file of this patent UNITED STATES PATENTS 2,495,885 Blume Jan. 31, 1950 FOREIGN PATENTS 560,310 Great Britain M ar..29, 1944 78,605 Denmark Dec. 13, 1954