Abstract An electric test tube heater has a self-supporting, freestanding electric resistance heating coil of low mass attached to and electrically insulated from a support member adjustably mounted for vertical movement on an upright stand. The coil is wound about a vertical axis and has an internal diameter larger than the outside diameter of the test tube to be heated. A clamp is also fixed to the support member and is axially aligned with the coil for holding the test tube so as to locate the lower portion thereof within the coil. A channel-shaped reflective heat shield open at the top and bottom to allow insertion of the test tube into the heater and having a vertical slot at the front to permit visual inspection of the test tube during the heating process is fixed to the support member and surrounds the coil. The support member is pivotally attached to the stand whereby the heating coil, clamp, test tube being heated and shield are all tiltable as a unit relative to the stand.
An electric heater for test tubes and the like comprising: a. vertically adjustable means; b. a support member pivotally attached to said means; c. a free standing, self supporting electric resistance heating coil attached to and electrically insulated from said support member, said coil being wound about a vertical axis and having an internal diameter larger than the outside diameter of the test tube being heated; d. clamp means attached to said support member in axial alignment with said heating coil for holding a test tube extending into said coil, said clamp, the test tube therein, said heating coil and support member all being tiltable as a unit about said pivot and vertically adjustable means; and e. means for connecting said coil to an electric power supply.
Claim 2
Dependent Claim
127 words
An electric heater for test tubes and the like comprising: a. vertically adjustable means; b. a support member pivotally attached to said means; c. a free standing, self supporting electric resistance heating coil attached to and electrically insulated from said support member, said coil being wound about a vertical axis and having an internal diameter larger than the outside diameter of the test tube being heated; d. clamp means attached to said support member in axial alignment with said heating coil for holding a test tube extending into said coil, said clamp, the test tube therein, said heating coil and support member all being tiltable as a unit about said pivot and vertically adjustable means; and e. means for connecting said coil to an electric power supply.
Claim 3
Dependent Claim
47 words
An electric heater as set forth in claim 1 including a heat shield and reflector attached to said support member and spaced about said heating coil, said heat shield and reflector being open at the top thereof to permit insertion of a test tube into said coil.
Claim 4
Dependent Claim
32 words
An electric heater as set forth in claim 1 wherein said heat shield is formed with a vertical slot at the front thereof for observing a test tube inserted into said coil.