The New Spruce Forge Manual of Locksmithing: A Blacksmith’s Guide to Simple Lock Mechanisms

More documents

Recommendations

Info

3/4” (19 mm) Slide the two levers onto the pin. Adjust the shape of the levers until they sit at right angles to the pin. The gap between the levers should be parallel. The ends of the levers are not the correct dimensions or length. Extra material has been added to the pattern to allow for any adjustments that may be needed when the bolts are installed in the lock. File the width of the arms of each lever to 3/8” (10 mm). The lower edge of the paddle on the arm of the lever for the upper dog should be resting on the cover plate. File the bottom edge of the paddle to adjust the height of the upper lever. The gap between the two levers should be no more than 1/16” (2 mm). The total height of both levers when installed on the pin should be approximately 3/4" (19 mm). Place the bolts in a fully locked position on the cover plate. The position of the pivot pin for the levers will be located directly below the ends of the bolts when they are in this position. Mark a vertical line onto the cover plate at this location. Move the bolts to a fully unlocked position. Adjust the position of the upper lever until the center of the paddle is in line with the middle of the tail of the upper bolt. Swing the hinge barrel over to the reference line for the hinge pin. Mark the location of the centerline of the hinge barrel onto the backplate. Drill the cover plate and rivet the pivot pin in place. Reposition the bolts on the cover plate in a fully locked position and set the upper lever against the upper bolt. Trim the length of the lever until it is level with the upper edge of the tail on the bolt. Trim the inside edge of the paddle of the upper lever until it is above the centerline between the two bolts. Install the lever for the lower bolt. Trim the length of the lever until it is below the centerline between the two bolts. Scribe the location of the top of the hinge barrel across the centerline for the hinge pin. Remove the bolts and levers and place the mainspring on the pattern. Position the tip of the spring above the scribe line for the top of the hinge barrel and in front the scribe line that marks the centerline for the hinge pin. Scribe the location of the tenons on the mounting block for the spring onto the cover plate. Drill out the center of the slot. Use chisels and files to shape the slot until it conforms to the tenon on the spring. 190
Install the spring into the cover plate and clamp in position. Install the levers and test the spring tension. The spring should be under tension when the levers reach the reference line for the ends of the bolts when they are fully locked. It should also apply an even tension on the levers as they are rotated from the locked to unlocked positions. The curvature of the spring can be adjusted until the correct spring tension is reached. When the correct spring tension is reached, the mainspring can be riveted to the cover plate. Point of contact for the levers should be a smooth curve The bolts can now be installed in the lock. Rotate the levers until the ends are below the bolt locations. Place the bolts on the backplate in a fully unlocked position. Place the center of the front bolt guide over the beveled edge of the bolts. Scribe and cut the slots for the front bolt guide. Contour the edges of the bolt tails to conform to the levers. Return the levers to their working position. Install the bolts and clamp both bolt guides to the cover plate. Test the operation of the bolts. They should slide easily from the locked to the unlocked position regardless of whether they are moved together or independently. Make any adjustments that may be necessary. Clamp the bolts to the cover plate. Remove the clamps from the bolt guides and rivet the guides in place. The end of the pivot pin is lightly riveted. This will flare the end to prevent the levers from working their way off the pin. 191
Page 2 and 3:
SECTION I - Technical Information -
Page 4 and 5:
VERNIER CALIPERS: These are the ine
Page 6 and 7:
Tools for Precision Work LIGHTING:
Page 8 and 9:
Blacksmithing and Benchwork Introdu
Page 10 and 11:
TONGS Tongs are long handled pliers
Page 12 and 13:
More hammering will create more ful
Page 14 and 15:
Planishing Planishing is refining t
Page 16 and 17: It is important to use the right si
Page 18 and 19: The sequence of colors above will a
Page 20 and 21: Filing Files are used to remove met
Page 22 and 23: Metal parts that need to have the f
Page 24 and 25: The hatchet stake is often used to
Page 26 and 27: 1/2” x 1/2” Grid (13 mm) Additi
Page 28 and 29: The pipe lock is a fine example of
Page 30 and 31: Use a 1/2”(13mm) square bar to si
Page 32 and 33: The bolt head is used as a drift th
Page 34 and 35: Lock Body Pattern 19.3 deg. 7-5/8
Page 36 and 37: File away the taper from the outsid
Page 38 and 39: Cross peen the end of the shackle t
Page 40 and 41: Cut the small washer from the bar.
Page 42 and 43: 1-1/2” (38 mm) 1/8” (3 mm) Hatc
Page 44 and 45: Place the spring back on the spring
Page 46 and 47: [4] Classic Medieval Spring Padlock
Page 48 and 49: This is another common form of spri
Page 50 and 51: This padlock has a very elaborate r
Page 52 and 53: 1/8” (3 mm) spacer keeps springs
Page 54 and 55: Cover Plate 5/16” (8 mm) 7/16”
Page 56 and 57: 3/16” dia. (5 mm) 3/4” (19 mm)
Page 58 and 59: Backplate 1 Bend allowance 1/16”
Page 60 and 61: Lay the latches in position on the
Page 62 and 63: Place the bolt on the backplate in
Page 64 and 65: The medieval spring lock is similar
Page 68 and 69: [9] Door Lock Key Backplate Bolt Fr
Page 70 and 71: Place the ward box on the backplate
Page 72 and 73: [11] Classic Rim Lock Side panel Ke
Page 74 and 75: Cover Plate & Ward Box 4-3/4” (12
Page 76 and 77: 1/4” (6 mm) 3/16” (5 mm) 3/16
Page 78 and 79: [12] Classic Lever Lock Cover plate
Page 80 and 81: Use the key to move the bolt from t
Page 82 and 83: Cut the handle from the bar. Place
Page 84 and 85: [14] Basic Padlock Shackle Backplat
Page 86 and 87: Bend the tail of the tumbler so tha
show all

The New Spruce Forge Manual of Locksmithing: A Blacksmith’s Guide to Simple Lock Mechanisms

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?