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When to Use Latches H-26

When to Use Camloc Latches

Camloc article excerpts as appeared in Machine Design

Latches are ideal for securing machine and equipment parts that must be opened or removed frequently. Many can be easily
modified to suit special requirements, thereby eliminating the need for custom designs.

Many parts on industrial and business machines, agricultural and construction equipment, aircraft, and road vehicles
must be opened or removed frequently to allow periodic servicing. Examples include hinged panels, doors drawers,
windows, and safety guards. All of these components can be secured with latches.

Latches allow quick access because the holding or locking element – a hook, pawl, or bolt releases immediately when a
handle knob, or tool socket is actuated. Typically, the holding component spans the joint between a panel or door and
the supporting frame. The latch base mounts either on the part to be opened/removed or the supporting frame. To lock a
latch, a hook, pawl, or bolt must be engaged with a strike, hole, protruding lip, or directly with the mating joint
member.

Most latches are available in adjustable versions to accommodate a range of panel and frame thick-nesses, so
manufacturing tolerances usually are not critical. Such latches usually have a self-compensating drawhook made of
spring steel, as lotted mounting base, or a threaded element to facilitate manual adjustment. Some adjustable latches
can be set to accommodate gaskets in joints. Latches can be attached mechanically with rivets or screws, or they can
be welded in place. Latches are usually made of steel, finished with a zinc-chromate coating. Other finishes include
chrome, black epoxy or polyurethane paint, and black oxide.Another common latch material is stainless steel. Also,
aluminum is sometimes used for latch bases where galvanic corrosion may be a problem.

Actuators on hand-operated latches include knobs, levers, or push buttons; tool-operated latches use a number of
different fittings. Such tool-operated latches are opened with screwdrivers or hex wrenches.

Many versions

A seemingly endless variety of latches is available. The reason for so many different components is that latch
suppliers routinely modify standard fasteners to suit special requirements. For instance, a certain overcenter tension
latch is available in more than 200 variations. Some of the modifications or options are a secondary lock or hasp,
extended drawhook, reversed hook, right-angle mounting base, base with raised pivot, and even special finishes or
materials.

Standard latches can be sorted into four general categories:

  • Handle-operated latches
  • Rotary-actuated latches
  • Slide latches
  • Panel latches

Design considerations

Latching requirements should be considered at the onset of new product development so that standard fasteners can be
selected if possible. If little thought is given to latching until the product design is well underway, the only
solution then extensively modify standard latches or design entirely new latches, both of which increase costs.

Today’s design standards call for an aesthetically pleasing appearance on the outside of machines and equipment.
Consequently, latches often must have flush, unobtrusive actuators.

Human engineering also plays an important role in latch selection. Thus, consideration should be given to who must
operate the latch, for what purpose, under what circumstances, and how often. For example, if a door on a piece of
heavy construction machinery must be opened often by an operator wearing gloves, a large knob or lever is needed. On
the other hand, if an access panel on a computer peripheral need be removed only by a service technician, then an
inconspicuous tool-operated latch is appropriate.

Electronic equipment poses special requirements for latches. For instance, latches not only must secure access panels
and doors,but also may have to provide sufficient clamping force to com-press RFI/EMI metalized gaskets. These gaskets
prevent radiofrequency or electromagnetic interference from entering or being emitted by equipment. In addition,
panels on certain electronic equipment must mount flush with outer surfaces, slam closed, and allow only limited
access. Such requirements usually can be met conveniently by specifying pull-release and trigger-release panel
latches, which are available off the shelf.

H-26

Overview H-1 Typical
Applications H-2
Electronic
Equipment H-3
Tension Latches
H-4
Tension Latches
H-5
Light
Duty Tension Latches H-6
Light
Duty Tension Latches H-7
30L Series H-8 34L Series H-9 95L Series H-10
96L Series H-11 47L
Series H-12
Custom Latches
H-13
Medium Duty
Latches H-14
Medium Duty
Latches H-15
20L Series H-16 20L Series H-17 20L Series H-18 29L Series H-19 51L Series H-20
51L Series Specs
H-21
51L Series
Strikes H-22
51L
Installation Data H-23
69L Series
Features H-24
69L Series
Strikes H-25
When to Use Latches
H-26
Heavy
Duty Tension Latches H-27
17L Series H-28 18L Series H-29 37L Series H-30
37L Series Specs
H-31
37L1/37L11/37L25
H-32
37L Strikes/Specs
H-33
37L Attachments
H-34
37L Seam Data
H-35
137L Series H-36 46L Series H-37 49L Series H-38 46L/49L
Installation H-39
58L Series H-40
58L Installation
H-41
Pawl Latches H-43 64L Series H-44 64L Installation
H-45
65L Series H-46
65L Installation
H-47
106L Features
H-48
106L Series H-49 106L
Installation H-50
106L Attachments
H-51
122L/123L Series
H-52
122L Series H-53 123L Series H-54 122/123L
Installation H-55
Panel Latches
H-56
Actuated Latches
H-57
KM610/KM680
Series H-58
KM610/KM680
Installation H-59
118L Series H-60 118L
Installation H-61
104L Series H-62 PT104L Series
H-63
119L Series H-64 119L
Installation H-65
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